WO2022113319A1

WO2022113319A1 - Cutting tool, cutting system, and installing method

Info

Publication number: WO2022113319A1
Application number: PCT/JP2020/044421
Authority: WO
Inventors: 小池雄介
Original assignee: 住友電気工業株式会社
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-06-02
Also published as: WO2022113750A1; JPWO2022113319A1; JP7168124B2; JP7294536B2; JPWO2022113750A1

Abstract

This cutting tool is provided with a shank that has a cutting edge or to which a cutting edge can be mounted and a sensor that is installed on the surface of the shank, wherein: the sensor is a shear strain sensor that can measure the shear strain in the shank; and a sensor distance D of the shear strain sensor fulfils Expression (1) when the shank height is referred to as W, the distance between the shank center at the installed position and the reference point of the cutting edge in a first direction, which is a direction parallel to the bottom surface of the shank and perpendicular to the shank axis, is referred to as distance dx, the distance between the shank center at the installed position and the reference point in a second direction, which is a direction perpendicular to the bottom surface of the shank, is referred to as distance dy, the distance between the installed position and the reference point in a third direction, which is a direction parallel to the axis, is referred to as sensor distance D, and the larger distance among the distance dx and the distance dy, if the distance dx and the distance dy are mutually different, is referred to as maxdxy, or the distance dx and the distance dy, if the distance dx equals the distance dy, are referred to as maxdxy.　Expression (1): D < 0.74W+2.09maxdxy

Description

Cutting tools, cutting systems and mounting methods

This disclosure relates to cutting tools, cutting systems and mounting methods.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2019-209420) discloses the following cutting processing system. That is, the cutting system is a processing device main body that performs cutting by contacting the cutting edge provided at the end of the cutting tool that is fixed to the tool fixing portion and extends at a predetermined length with the rotating work piece. A cutting system including a data acquisition device and an information processing device, in which a plurality of strain sensors that measure strain generated in the cutting tool due to cutting resistance during cutting are provided along the longitudinal direction of the cutting tool. The measurement data acquisition device is provided side by side, and the measurement data acquisition device acquires sensor data which is data based on each output signal of the strain sensor, and the information processing device receives the sensor data of each of the plurality of strain sensors. The deflection of the cutting tool is obtained based on the sensor data of each of the plurality of strain sensors, and the machining error in the cutting process is obtained based on the deflection.

Japanese Unexamined Patent Publication No. 2019-209420 Japanese Unexamined Patent Publication No. 2012-91277 European Patent Application Publication No. 3292930

The cutting tool of the present disclosure is a cutting tool for turning, and includes a shank having a cutting edge or to which a cutting edge can be attached, and a sensor mounted on the surface of the shank. A shear strain sensor capable of measuring the shear strain of the shank, in a first direction in which the shank height of the shank is W, parallel to the bottom surface of the shank, and orthogonal to the axis of the shank. The distance between the center of the shank and the reference point of the cutting edge at the mounting position is defined as the distance dx, and the center of the shank at the mounting position and the shank in the second direction orthogonal to the bottom surface of the shank. The distance to the reference point is defined as the distance dy, the distance between the mounting position and the reference point in the third direction parallel to the axis is defined as the sensor distance D, and the distance dx and the distance dy are defined. When the values are different from each other, the larger of the distance dx and the distance dy is set to maxdxy, and when the distance dx and the distance dy are equal values, the distance dx and the distance dy are set to maxdxy. , The sensor distance D of the shear strain sensor satisfies the formula (A).
D <0.74W + 2.09maxdxy ... (A)

The cutting tool of the present disclosure is a cutting tool for turning, and includes a shank having a cutting edge or to which a cutting edge can be attached, and a sensor mounted on the surface of the shank. A first shear strain sensor capable of measuring the shear strain of the shank, the shank comprising four surfaces surrounding an axis, the first shear strain sensor being at least one of the four surfaces. When one mounting surface is divided into three equal regions arranged in the circumferential direction of the shank, the mounting surface is mounted in the middle of the three regions.

The cutting tool of the present disclosure is a cutting tool for turning, and includes a shank having a cutting edge or to which a cutting edge can be attached, and a sensor mounted on the surface of the shank. A first vertical strain sensor capable of measuring the vertical strain of the shank, the shank comprising four surfaces surrounding an axis, the first vertical strain sensor being the cutting edge of the four surfaces. When the first surface closest to the reference point is divided into three regions arranged in the circumferential direction of the shank, the region closest to the reference point among the three regions on the first surface, the fourth. When the second surface of the two surfaces, which is the second closest to the reference point, is divided into three equal parts in the circumferential direction of the shank, the reference point of the three regions on the second surface is used. When the nearest third surface of the four surfaces facing the first surface is divided into three equal regions arranged in the circumferential direction of the shank, the three regions on the third surface are divided into three equal parts. When the region farthest from the reference point and the fourth surface of the four surfaces facing the second surface are divided into three equal regions arranged in the circumferential direction of the shank, the first It is mounted on any one of the three regions on the surface, which is the furthest from the reference point.

FIG. 1 is a diagram showing a configuration of a cutting system according to the first embodiment of the present disclosure. FIG. 2 is a diagram showing a state in which a cutting tool according to the first embodiment of the present disclosure is attached to a machine tool. FIG. 3 is a cross-sectional view showing the configuration of a cutting tool according to the first embodiment of the present disclosure. FIG. 4 is a diagram showing a configuration of a processing device in the cutting system according to the first embodiment of the present disclosure. FIG. 5 is a diagram showing an example of the configuration of a cutting tool according to the first embodiment of the present disclosure. FIG. 6 is a cross-sectional view showing the configuration of a cutting tool according to the first embodiment of the present disclosure. FIG. 7 is a cross-sectional view showing the configuration of a cutting tool according to the first embodiment of the present disclosure. FIG. 8 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 9 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 10 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 11 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 12 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 13 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 14 is a diagram showing an example of the configuration of the cutting tool according to the first modification of the first embodiment of the present disclosure. FIG. 15 is a cross-sectional view showing the configuration of the cutting tool according to the first modification of the first embodiment of the present disclosure. FIG. 16 is a cross-sectional view showing the configuration of the cutting tool according to the first modification of the first embodiment of the present disclosure. FIG. 17 is a diagram showing an example of the configuration of the cutting tool according to the second modification of the first embodiment of the present disclosure. FIG. 18 is a cross-sectional view showing the configuration of the cutting tool according to the second modification of the first embodiment of the present disclosure. FIG. 19 is a cross-sectional view showing the configuration of the cutting tool according to the second modification of the first embodiment of the present disclosure. FIG. 20 is a diagram showing an example of the configuration of a cutting tool according to the third modification of the first embodiment of the present disclosure. FIG. 21 is a cross-sectional view showing the configuration of the cutting tool according to the third modification of the first embodiment of the present disclosure. FIG. 22 is a cross-sectional view showing the configuration of the cutting tool according to the third modification of the first embodiment of the present disclosure. FIG. 23 is a diagram showing an example of the configuration of the cutting tool according to the modified example 4 of the first embodiment of the present disclosure. FIG. 24 is a diagram showing an example of the configuration of the cutting tool according to the modification 5 of the first embodiment of the present disclosure. FIG. 25 is a diagram showing an example of the configuration of the cutting tool according to the modification 6 of the first embodiment of the present disclosure. FIG. 26 is a diagram showing an example of the configuration of the cutting tool according to the modification 7 of the first embodiment of the present disclosure. FIG. 27 is a diagram showing an example of the configuration of the cutting tool according to the modification 8 of the first embodiment of the present disclosure. FIG. 28 is a cross-sectional view showing the configuration of the cutting tool according to the modified example 8 of the first embodiment of the present disclosure. FIG. 29 is a cross-sectional view showing the configuration of the cutting tool according to the modified example 8 of the first embodiment of the present disclosure. FIG. 30 is a cross-sectional view showing the configuration of the cutting tool according to the modified example 8 of the first embodiment of the present disclosure. FIG. 31 is a diagram showing an example of the configuration of the cutting tool according to the modified example 9 of the first embodiment of the present disclosure. FIG. 32 is a cross-sectional view showing the configuration of the cutting tool according to the modified example 9 of the first embodiment of the present disclosure. FIG. 33 is a diagram showing an example of the configuration of the cutting tool according to the modification 10 of the first embodiment of the present disclosure. FIG. 34 is a cross-sectional view showing the configuration of the cutting tool according to the modified example 10 of the first embodiment of the present disclosure. FIG. 35 is a diagram showing an example of the configuration of the cutting tool according to the modification 11 of the first embodiment of the present disclosure. FIG. 36 is a cross-sectional view showing the configuration of the cutting tool according to the modified example 11 of the first embodiment of the present disclosure. FIG. 37 is a diagram showing a configuration of an outer diameter bite which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 38 is a cross-sectional view showing the configuration of an outer diameter bite which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 39 is a diagram showing a calculation result of vertical strain in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 40 is a diagram showing a calculation result of vertical strain in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 41 is a diagram showing a calculation result of vertical strain in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 42 is a diagram showing a calculation result of a shear strain in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 43 is a diagram showing a calculation result of a shear strain in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 44 is a diagram showing a calculation result of a shear strain in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 45 is a diagram showing a configuration of a sword bite which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 46 is a cross-sectional view showing the configuration of a sword bite, which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 47 is a diagram showing a calculation result of vertical strain in a sword tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 48 is a diagram showing a calculation result of shear strain in a sword tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 49 is a diagram showing the relationship between the distance from the reference point and the vertical strain and the shear strain in the outer diameter tool which is an example of the cutting tool according to the first embodiment of the present disclosure. FIG. 50 is a diagram showing the relationship between the distance from the reference point and the vertical strain and the shear strain in the outer diameter tool which is an example of the cutting tool according to the first embodiment of the present disclosure. FIG. 51 is a diagram showing the relationship between the shank height and the equal strain distance in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 52 is a diagram showing the relationship between the shank height and the equal strain distance in a sword tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 53 is a flowchart defining an example of a mounting method when mounting a strain sensor on a cutting tool according to the first embodiment of the present disclosure. FIG. 54 is a diagram showing an example of the configuration of the cutting tool according to the second embodiment of the present disclosure. FIG. 55 is a cross-sectional view showing the configuration of the cutting tool according to the second embodiment of the present disclosure. FIG. 56 is a diagram showing an example of the configuration of the cutting tool according to the third embodiment of the present disclosure. FIG. 57 is a cross-sectional view showing the configuration of the cutting tool according to the third embodiment of the present disclosure. FIG. 58 is a diagram showing an example of the configuration of the cutting tool according to the fourth embodiment of the present disclosure. FIG. 59 is a diagram showing another example of the mounting position of the strain sensor in the cutting tool according to the first to fourth embodiments of the present disclosure. FIG. 60 is a diagram showing another example of the mounting position of the strain sensor in the cutting tool according to the first to fourth embodiments of the present disclosure.

Conventionally, a technology has been proposed in which a strain sensor is attached to a cutting tool, the cutting resistance is calculated based on the measurement result of the strain of the cutting tool during cutting by the strain sensor, and the abnormality of the cutting edge in the cutting tool is detected. Has been done.

[Problems to be solved by this disclosure]
Beyond the techniques described in Patent Documents 1 to 3 described above, a technique capable of measuring shank strain with higher sensitivity using a strain sensor is desired.

The present disclosure has been made to solve the above-mentioned problems, and an object thereof is to provide a cutting tool, a cutting system and a mounting method capable of measuring the strain of a shank with higher sensitivity by using a strain sensor. It is to be.

[Effect of this disclosure]
According to the present disclosure, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

[Explanation of Embodiments of the present disclosure]
First, the contents of the embodiments of the present disclosure will be listed and described.

(1) The cutting tool according to the embodiment of the present disclosure is a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and a sensor mounted on the surface of the shank. The sensor is a shear strain sensor capable of measuring the shear strain of the shank, the shank height of the shank is W, parallel to the bottom surface of the shank, and orthogonal to the axis of the shank. The distance dx is the distance between the center of the shank at the mounting position and the reference point of the cutting edge in the first direction, which is the direction, and the mounting in the second direction perpendicular to the bottom surface of the shank. The distance between the center of the shank and the reference point at the position is defined as the distance dy, and the distance between the mounting position and the reference point in the third direction parallel to the axis is defined as the sensor distance D. When the distance dx and the distance dy are different values, the larger of the distance dx and the distance dy is set as maxdxy, and when the distance dx and the distance dy are equal values, the distance dx and When the distance dy is maxdxy,
The sensor distance D of the shear strain sensor satisfies the equation (1).
D <0.74W + 2.09maxdxy ... (1)

As described above, the configuration in which the sensor distance D of the shear strain sensor satisfies the above equation (1) is different from the configuration in which the vertical strain sensor capable of measuring the vertical strain of the shank is used instead of the shear strain sensor, in the first direction or. The shear strain generated by the load in the second direction can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

(2) Preferably, when the smaller of the distance dx and the distance dy is mindxy, the sensor distance D of the shear strain sensor satisfies the equation (2).
D <0.74W + 2.09mindxy ... (2)

With such a configuration, the shear strain generated by the load in the first direction or the load in the second direction can be measured with higher sensitivity as compared with the configuration in which the vertical strain sensor is used instead of the shear strain sensor. ..

(3) More preferably, the cutting tool includes a plurality of the sensors, at least two of the plurality of sensors are the shear strain sensors, and each sensor distance of the two shear strain sensors. D satisfies the above formula (2).

With such a configuration, for example, shear strain on a plurality of surfaces of a shank can be measured with high sensitivity.

(4) More preferably, one of the two shear strain sensors is a first load which is a load in the first direction, a second load which is a load in the second direction, and a load in the third direction. Of the third load, it has the highest sensitivity to the second load, and the other of the two shear strain sensors is the first of the first load, the second load and the third load. Has maximum sensitivity to loads.

With such a configuration, it is possible to calculate two of the three components of cutting resistance based on the measurement results of the two shear strain sensors during cutting.

(5) Preferably, the cutting tool includes a plurality of the sensors, and at least one of the plurality of sensors is a vertical strain sensor capable of measuring the vertical strain of the shank.

With such a configuration, it is possible to measure the vertical strain generated by the load in the axial direction, which is difficult to measure with the shear strain sensor.

(6) More preferably, the vertical strain sensor has a first load which is a load in the first direction, a second load which is a load in the second direction, and a third load which is a load in the third direction. Among them, it has the maximum sensitivity to the third load.

With such a configuration, it is possible to calculate the axial component of the three component forces of the cutting resistance based on the measurement result of the vertical strain during cutting.

(7) Preferably, when the smaller of the distance dx and the distance dy is mindxy, the sensor distance D of the vertical strain sensor satisfies the equation (3).
0.74W + 2.09mindxy <D <0.74W + 2.09maxdxy ... (3)
When the distance dx is larger than the distance dy, the vertical strain sensor is a first load which is a load in the first direction, a second load which is a load in the second direction, and a load in the third direction. Among the third loads, the vertical strain sensor has the maximum sensitivity to the first load, and when the distance dy is larger than the distance dx, the first load, the second load, and the second load. Of the three loads, it has the highest sensitivity to the second load.

With such a configuration, the strain generated by the first load or the second load can be measured with higher sensitivity by using the vertical strain sensor.

(8) The cutting tool according to the embodiment of the present disclosure is a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and a sensor mounted on the surface of the shank. The sensor is a first shear strain sensor capable of measuring the shear strain of the shank, the shank includes four surfaces surrounding an axis, and the first shear strain sensor is the fourth. When the mounting surface, which is at least one of the three surfaces, is divided into three equal regions arranged in the circumferential direction of the shank, the mounting surface is mounted in the middle of the three regions.

In this way, by mounting the shear strain sensor in the middle region of the three equally divided regions on the mounting surface, the shear strain generated by the load in the first direction or the second direction is higher. It can be measured by sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

(9) Preferably, the first shear strain sensor is mounted in the middle of the five regions when the mounting surface is divided into five equal regions arranged in the circumferential direction of the shank. Ru.

With such a configuration, the shear strain of the shank can be measured with even higher sensitivity.

(10) Preferably, the first shear strain sensor is mounted on the surface of the four surfaces closest to the reference point of the cutting edge.

(11) Preferably, the cutting tool further includes, as the sensor, a second shear strain sensor capable of measuring the shear strain of the shank, and the second shear strain sensor is among the four surfaces. When the adjacent surface adjacent to the mounting surface is divided into three equal regions arranged in the circumferential direction of the shank, the surface is mounted in the middle of the three regions.

With such a configuration, the shear strain on each of the two surfaces of the shank can be measured with higher sensitivity.

(12) Preferably, the second shear strain sensor is mounted in the middle of the five regions when the adjacent surface is divided into five equal regions arranged in the circumferential direction of the shank. Ru.

With such a configuration, the shear strain on each of the two surfaces of the shank can be measured with even higher sensitivity.

(13) Preferably, the second shear strain sensor is mounted on the surface of the four surfaces that is second closest to the reference point of the cutting edge.

(14) Preferably, one of the first shear strain sensor and the second shear strain sensor is a first load that is parallel to the bottom surface of the shank and is a load in a direction orthogonal to the axis. Of the second load, which is a load orthogonal to the bottom surface, and the third load, which is a load parallel to the axis, the first load has the highest sensitivity to the first load, and the first shear strain. The other of the sensor and the second shear strain sensor has the highest sensitivity to the second load of the first load, the second load and the third load.

(15) The cutting tool according to the embodiment of the present disclosure is a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and a sensor mounted on the surface of the shank. The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank, the shank includes four surfaces surrounding an axis, and the first vertical strain sensor is the fourth. When the first surface of the three surfaces closest to the reference point of the cutting edge is divided into three equal parts in the circumferential direction of the shank, the reference point of the three regions on the first surface is divided into three equal parts. When the second surface of the four surfaces closest to the reference point is divided into three regions arranged in the circumferential direction of the shank, the three regions on the second surface are divided into three equal parts. When the region closest to the reference point among the regions and the third surface of the four surfaces facing the first surface are divided into three equal regions arranged in the circumferential direction of the shank, the first The region of the three surfaces farthest from the reference point, and the fourth surface of the four surfaces facing the second surface are arranged in the three regions of the shank in the circumferential direction. When divided into three equal parts, it is mounted on any one of the three regions on the fourth surface, which is the furthest from the reference point.

In this way, the vertical strain sensor is mounted in the vicinity of the boundary portion closest to the reference point or the boundary portion farthest from the reference point in the boundary portion of the surface of the shank, so that the direction is parallel to the axis. The vertical strain caused by the load can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

(16) Preferably, when the first vertical strain sensor divides the first surface into five equal regions arranged in the circumferential direction of the shank, the first of the five regions on the first surface is said. The region closest to the reference point, the region closest to the reference point among the five regions on the second surface when the second surface is divided into five regions arranged in the circumferential direction of the shank. , The region farthest from the reference point among the five regions on the third surface when the third surface is divided into five regions arranged in the circumferential direction of the shank, and the fourth surface. Is mounted in any one of the five regions on the fourth surface, which is the furthest from the reference point, when the shank is divided into five regions arranged in the circumferential direction.

With such a configuration, the vertical strain in the shank can be measured with even higher sensitivity.

(17) The cutting tool according to the embodiment of the present disclosure is a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and a sensor mounted on the surface of the shank. The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank, wherein the shank comprises four surfaces surrounding an axis and of the cutting edge of the four surfaces. The surface closest to the reference point is the first surface, the surface second closest to the reference point among the four surfaces is the second surface, and the surface faces the first surface of the four surfaces. When the surface is the third surface and the surface of the four surfaces facing the second surface is the fourth surface, either the first surface or the third surface is of the shank. The bottom surface, where the shank height of the shank is W, parallel to the bottom surface of the shank, and with the center of the shank at the mounting position of the first vertical strain sensor in a direction orthogonal to the axis of the shank. When the distance between the cutting edge and the reference point is defined as the distance dx, and the distance between the center of the shank and the reference point at the mounting position in the direction perpendicular to the bottom surface is defined as the distance dy, the equation ( 4) is satisfied,
10dx≤dy + W / 6 ... (4)
The first vertical strain sensor is mounted on the first surface or the third surface.

In this way, the vertical strain sensor is mounted on the surface closest to the reference point or the surface facing the reference point in the shank of the cutting tool whose distance dx is small with respect to the distance dy, such as a sword bite. The vertical strain caused by the load in the direction parallel to the axis can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

(18) The cutting tool according to the embodiment of the present disclosure is a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and a sensor mounted on the surface of the shank. The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank, wherein the shank comprises four surfaces surrounding an axis and of the cutting edge of the four surfaces. The surface closest to the reference point is the first surface, the surface second closest to the reference point among the four surfaces is the second surface, and the surface faces the first surface of the four surfaces. When the surface is the third surface and the surface of the four surfaces facing the second surface is the fourth surface, either the second surface or the fourth surface is of the shank. The bottom surface, where the shank height of the shank is W, parallel to the bottom surface of the shank, and with the center of the shank at the mounting position of the first vertical strain sensor in a direction orthogonal to the axis of the shank. When the distance between the cutting edge and the reference point is defined as the distance dx, and the distance between the center of the shank and the reference point at the mounting position in the direction perpendicular to the bottom surface is defined as the distance dy, the equation ( 5) is satisfied,
10dy ≤ dx + W / 6 ... (5)
The first vertical strain sensor is mounted on the first surface or the third surface.

In this way, the vertical strain sensor is mounted on the surface closest to the reference point or the surface facing the reference point in the shank of the cutting tool in which the distance dy is smaller than the distance dx, so that the vertical strain sensor is mounted in the direction parallel to the axis. The vertical strain generated by the load can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

(19) Preferably, the cutting tool further includes, as the sensor, a first shear strain sensor and a second shear strain sensor capable of measuring the shear strain of the shank, and the first shear strain sensor. Is mounted in the middle of the three regions when the first surface is divided into three equal regions arranged in the circumferential direction of the shank, and the second shear strain sensor is the second shear strain sensor. When the two surfaces are divided into three regions arranged in the circumferential direction of the shank, the two surfaces are mounted on the region in the middle of the three regions, and the first vertical strain sensor is parallel to the bottom surface of the shank. Of the first load, which is a load in the direction orthogonal to the axis, the second load is a load in the direction orthogonal to the bottom surface, and the third load is a load in the direction parallel to the axis. It has the maximum sensitivity to the third load, and one of the first shear strain sensor and the second shear strain sensor is the first load, the second load, and the third load. It has the maximum sensitivity to the first load, and the other of the first shear strain sensor and the second shear strain sensor is the first load, the second load, and the third load. It has the maximum sensitivity to the second load.

With such a configuration, it is possible to calculate the three component forces of the cutting resistance based on the measurement results of the three strain sensors during cutting.

(20) Preferably, the cutting tool further includes, as the sensor, a third vertical strain sensor capable of measuring the vertical strain of the shank and a shear strain sensor capable of measuring the shear strain of the shank. The third vertical strain sensor is mounted on the bottom surface of the shank of the four surfaces or the surface surface of the four surfaces facing the bottom surface, and the shear strain sensor is the shear strain sensor. When the surface of the bottom surface and the top surface closest to the reference point is divided into three equal regions arranged in the circumferential direction of the shank, the surface is mounted on the region in the middle of the three regions, and the first surface is mounted on the region. The vertical strain sensor has a first load that is parallel to the bottom surface and is a load in a direction orthogonal to the axis, a second load that is a load in a direction orthogonal to the bottom surface, and a load in a direction parallel to the axis. Of the third load, the third vertical strain sensor has the maximum sensitivity to the third load, and the third vertical strain sensor is the third of the first load, the second load, and the third load. It has the maximum sensitivity to two loads, and the shear strain sensor has the maximum sensitivity to the first load among the first load, the second load and the third load.

(21) Preferably, the cutting tool further includes, as the sensor, a second vertical strain sensor capable of measuring the vertical strain of the shank and a shear strain sensor capable of measuring the shear strain of the shank. The second vertical strain sensor is mounted on the first side surface of the four surfaces adjacent to the bottom surface of the shank, or on the second side surface of the four surfaces facing the first side surface. When the shear strain sensor divides the surface of the first side surface and the second side surface closest to the reference point into three regions arranged in the circumferential direction of the shank, the shear strain sensor is located in the middle of the three regions. The first vertical strain sensor mounted on the region has a first load that is parallel to the bottom surface and is a load in a direction orthogonal to the axis, and a second load that is a load in a direction orthogonal to the bottom surface. , And the third load, which is a load in the direction parallel to the axis, has the maximum sensitivity to the third load, and the second vertical strain sensor is the first load and the second load. And the shear strain sensor has the maximum sensitivity to the first load among the third loads, and the shear strain sensor is attached to the second load among the first load, the second load and the third load. On the other hand, it has the maximum sensitivity.

(22) Preferably, the cutting tool further comprises, as the sensor, a second vertical strain sensor and a third vertical strain sensor capable of measuring the vertical strain of the shank, the second vertical strain sensor. Is mounted on the first side surface of the four surfaces adjacent to the bottom surface of the shank, or on the second side surface of the four surfaces facing the first side surface, and the third vertical strain sensor is , The first vertical strain sensor mounted on the bottom surface of the shank of the four surfaces or the surface of the four surfaces facing the bottom surface, the first vertical strain sensor being parallel to the bottom surface. The third of the first load, which is a load perpendicular to the axis, the second load, which is a load perpendicular to the bottom surface, and the third load, which is a load parallel to the axis. The second vertical strain sensor has the maximum sensitivity to the load, and the second vertical strain sensor has the maximum sensitivity to the first load among the first load, the second load, and the third load. The third vertical strain sensor has the maximum sensitivity to the second load among the first load, the second load and the third load.

(23) Preferably, the width of the shank and the shank height of the shank are equal.

With such a configuration, it is possible to measure the strain of a regular square prism-shaped square shank widely used in turning with higher sensitivity by using a strain sensor.

(24) The cutting system according to the embodiment of the present disclosure includes the cutting tool and a processing device, and the processing device causes an abnormality related to the cutting tool based on the measurement result of the sensor at the time of cutting. Detect.

With such a configuration, it is possible to detect abnormalities related to cutting tools more accurately.

(25) The mounting method according to the embodiment of the present disclosure is a mounting method in which a sensor is mounted on a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and the sensor. The sensor is a shear strain sensor capable of measuring the shear strain of the shank, and the step of mounting the sensor includes a step of preparing the shank and a step of mounting the sensor on the surface of the shank. The shank height of the shank is W, and the center of the shank and the reference point of the cutting edge at the mounting position in the first direction parallel to the bottom surface of the shank and perpendicular to the axis of the shank. The distance between the shank and the reference point is defined as the distance dx, and the distance between the center of the shank and the reference point at the mounting position in the second direction orthogonal to the bottom surface of the shank is defined as the distance dy. The distance between the mounting position and the reference point in the third direction, which is a parallel direction, is defined as the sensor distance D, and when the distance dx and the distance dy are different values, the distance dx and the distance dy are used. When the larger one is maxdxy and the distance dx and the distance dy are equal and the distance dx and the distance dy are maxdxy, the sensor distance D of the shear strain sensor is given by the equation (6). The shear strain sensor is mounted on the surface of the shank so as to satisfy the above conditions.
D <0.74W + 2.09maxdxy ... (6)

As described above, by the method in which the sensor distance D of the shear strain sensor satisfies the above equation (6), as compared with the configuration in which the vertical strain sensor capable of measuring the vertical strain of the shank is used instead of the shear strain sensor, the first direction or The shear strain generated by the load in the second direction can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

(26) The mounting method according to the embodiment of the present disclosure is a mounting method in which a sensor is mounted on a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and the sensor. The sensor is a shear strain sensor capable of measuring the shear strain of the shank, and the shank includes four steps surrounding the axis. In the step of mounting the sensor, including the surface, the shear strain sensor is placed in three regions where the mounting surface, which is at least one of the four surfaces of the shank, is aligned in the circumferential direction of the shank. When it is divided into three equal parts, it is mounted on the area in the middle of the three areas.

(27) The mounting method according to the embodiment of the present disclosure is a mounting method in which a sensor is mounted on a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be mounted, and the sensor. A step of preparing the shank and a step of mounting the sensor on the surface of the shank, wherein the sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank, and the shank has an axis. In the step of mounting the sensor, the first surface of the four surfaces, which includes the surrounding four surfaces and is closest to the reference point of the cutting edge, is the circumferential direction of the shank. When divided into three equal parts, the region closest to the reference point among the three regions on the first surface, and the second region closest to the reference point among the four surfaces. When the surface is divided into three equal parts in the circumferential direction of the shank, the region closest to the reference point among the three regions on the second surface, and the first of the four surfaces. When the third surface facing the surface is divided into three equal parts in the circumferential direction of the shank, the region farthest from the reference point among the three regions on the third surface, and the fourth. When the fourth surface of the three surfaces facing the second surface is divided into three equal parts in the circumferential direction of the shank, the most of the three regions of the fourth surface is the reference point. It is mounted in any one of the distant areas.

In this way, the vertical strain sensor is mounted in the vicinity of the boundary portion closest to the reference point or the boundary portion farthest from the reference point in the boundary portion of the surface of the shank, in a direction parallel to the axis. The vertical strain caused by the load can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

(28) The mounting method according to the embodiment of the present disclosure is a mounting method in which a sensor is mounted on a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and the sensor. A step of preparing the shank and a step of mounting the sensor on the surface of the shank, wherein the sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank, and the shank has an axis. The surface including the surrounding four surfaces, which is the closest to the reference point of the cutting edge among the four surfaces, is the first surface, and the surface of the four surfaces closest to the reference point is the first surface. When the two surfaces are defined, the surface facing the first surface of the four surfaces is designated as the third surface, and the surface facing the second surface of the four surfaces is designated as the fourth surface. One of the first surface and the third surface is the bottom surface of the shank, and in the step of mounting the sensor, the shank height of the shank is W, which is parallel to the bottom surface of the shank. Moreover, the distance between the center of the shank and the reference point of the cutting edge at the mounting position of the first vertical strain sensor in the direction orthogonal to the axis of the shank is defined as the distance dx, and is orthogonal to the bottom surface of the shank. When the distance between the center of the shank and the reference point in the mounting position in the direction is a distance dy, the first vertical strain sensor is mounted on the first surface or the first surface so as to satisfy the equation (7). It is mounted on the third surface.
10dx≤dy + W / 6 ... (7)

In this way, the vertical strain sensor is mounted on the surface closest to the reference point or the surface facing the reference point in the shank of a cutting tool having a distance dx smaller than the distance dy, such as a sword bite. The vertical strain caused by the load in the direction parallel to the axis can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

(29) The mounting method according to the embodiment of the present disclosure is a mounting method in which a sensor is mounted on a cutting tool for turning, and has a shank having a cutting edge or to which a cutting edge can be attached, and the sensor. A step of preparing the shank and a step of mounting the sensor on the surface of the shank, wherein the sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank, and the shank has an axis. The surface including the surrounding four surfaces, which is the closest to the reference point of the cutting edge among the four surfaces, is the first surface, and the surface of the four surfaces closest to the reference point is the first surface. When the two surfaces are defined, the surface facing the first surface of the four surfaces is designated as the third surface, and the surface facing the second surface of the four surfaces is designated as the fourth surface. Either the second surface or the fourth surface is the bottom surface of the shank, and in the step of mounting the sensor, the shank height of the shank is W, which is parallel to the bottom surface of the shank. Moreover, the distance between the center of the shank and the reference point of the cutting edge at the mounting position of the first vertical strain sensor in the direction orthogonal to the axis of the shank is defined as the distance dx, and is orthogonal to the bottom surface of the shank. When the distance between the center of the shank and the reference point in the mounting position in the direction is a distance dy, the first vertical strain sensor is mounted on the first surface or the first surface so as to satisfy the equation (8). It is mounted on the third surface.
10dy ≤ dx + W / 6 ... (8)

In this way, the vertical strain sensor is mounted on the surface closest to the reference point or the surface facing the reference point in the shank of the cutting tool whose distance dy is small with respect to the distance dx, in the direction parallel to the axis. The vertical strain generated by the load can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated. In addition, at least a part of the embodiments described below may be arbitrarily combined.

<First Embodiment>
[Cutting system]
FIG. 1 is a diagram showing a configuration of a cutting system according to the first embodiment of the present disclosure. With reference to FIG. 1, the cutting system 301 includes a cutting tool 101 for turning and a processing device 201. The cutting tool 101 is used, for example, for turning an object to be cut made of metal or the like. The cutting tool 101 includes a shank 10 and one or more strain sensors 20. The strain sensor 20 is mounted on the surface of the shank 10. For example, the strain sensor 20 is attached to the surface of the shank 10 via an adhesive or adhesive. For example, the strain sensor 20 may be fixed by being embedded in a resin material or the like while being attached to the shank 10. The processing device 201 detects an abnormality related to the cutting tool 101 based on the measurement result of the strain sensor 20 during cutting.

[Cutting tools]
The shape of the shank 10 is, for example, a regular quadrangular prism shape. More specifically, the shank 10 has a width b and a height when the length of the width direction WD in the cross section of the shank 10 is the width b and the length of the height direction HD in the cross section of the shank 10 is the height h. A square shank having the same height as h and having a regular quadrangular cross-sectional shape. Here, the height direction HD is a direction parallel to the direction of the main movement in the plane perpendicular to the longitudinal direction of the shank 10 in the tool system reference method, and the width direction WD is the main movement in the plane. The direction is perpendicular to the direction of. The shank 10 may be a square shank having a height h larger than a width b and a quadrangular cross-sectional shape. Further, the shank 10 may be a round shank in which the width b and the height h are equal and the cross-sectional shape is not a regular quadrangle. Further, the shank 10 may be a round shank having a width b larger than a height h and a cross-sectional shape that is not a regular quadrangle. The shape and dimensions of the square shank are specified by JIS (Japanese Industrial Standards) B 4126 (established on November 21, 2016) and ISO (International Organization for Standardization) 5610 (established on August 21, 2014). The shape and dimensions of the round shank are specified by JIS B 4129 (established January 20, 2020) and ISO 5609 (established December 13, 2012). Hereinafter, the maximum length of the HD in the height direction of the shank 10 at the mounting position of the strain sensor 20 is defined as the height hsen, and the maximum length of the WD in the width direction of the shank 10 at the mounting position of the strain sensor 20 is defined as the width bsen. The height hsen is also referred to as a shank height W.

The number of flats, that is, flat surfaces on the outer peripheral surface of the shank 10 which is a round shank may be zero, one, two, three, or four. That is, the cross-sectional shape symbols of the shank 10, which is a round shank, defined in JIS B 4129-1 are "10", "11", "12", "13", "14", "21", "22". , "31", "32", "33", "34", and "41". The width direction WD of the shank 10 whose cross-sectional shape symbol is "13", "14", or "22" is a direction parallel to the direction of the diameter φd. That is, the length of the WD in the width direction in the cross section of the shank 10 whose cross-sectional shape symbol is "13", "14", or "22" is equal to the diameter φd of the shank 10. Further, the height direction HD of the shank 10 whose cross-sectional shape symbol is “11”, “12” or “21” is a direction parallel to the direction of the diameter φd. That is, the length of the HD in the height direction in the cross section of the shank 10 whose cross-sectional shape symbol is "11", "12", or "21" is equal to the diameter φd of the shank 10.

For example, the shank 10 can be attached with a cutting edge. More specifically, the shank 10 can be fitted with a chip 1 having a cutting edge at the first end in the direction of the virtual shaft 17. That is, the cutting tool 101 is a cutting tool with a replaceable cutting edge, that is, a throw-away tool. The chip 1 has a polygonal shape such as a triangle, a square, a rhombus, and a pentagon when viewed from above. For example, the chip 1 has a through hole formed in the center of the upper surface and is fixed to the shank 10 by the fixing

members

3A and 3B. The shank 10 may have a cutting edge instead of being able to attach the cutting edge. More specifically, the shank 10 has a cutting edge at the first end in the direction of the axis 17. That is, the cutting tool 101 may be a tool other than the throw-away tool, such as a peeling tool or a brazing tool. Here, the shaft 17 is a neutral shaft that does not expand or contract when the shank 10 is bent. The axis 17, which is the neutral axis, coincides with the center of gravity in the cross section of the shank 10 when the shank 10 is made of a single material.

Chip 1 has a reference point 1K. The reference point 1K is, for example, the tip portion of the chip 1. More specifically, the reference point 1K in the chip 1 having a cutting angle of 90 ° or less is an intersection of the assumed working surface, the cutting edge surface, and the rake surface. Further, the reference point 1K in the chip 1 having a cutting angle larger than 90 ° is an intersection of the assumed work surface, the surface perpendicular to the assumed work surface and in contact with the corner radius of the chip 1, and the rake surface. Further, the reference point 1K with respect to the shape symbol D of the cutting edge with the circular tip, that is, the “diamond apex angle 55 °”, is perpendicular to the assumed work surface passing through the central axis of the chip 1 and the assumed work surface. It is the intersection of the surface in contact with the blade and the rake surface. Further, the reference point 1K for the shape symbol S of the cutting edge with the circular tip, that is, the “square” is the assumed work surface passing through the central axis of the chip 1 and the surface perpendicular to the assumed work surface and in contact with the cutting edge. And the intersection with the rake face. In the case of the shape symbol S of the cutting edge, since there are two assumed work surfaces depending on the two orthogonal main feed directions, there are also two reference points 1K. For example, the reference point 1K is defined by JIS B 4126-1.

FIG. 2 is a diagram showing a state in which the cutting tool according to the first embodiment of the present disclosure is attached to the machine tool. With reference to FIG. 2, the cutting tool 101 is sandwiched and fixed from above and below by the

blade bases

50A and 50B in a machine tool such as a lathe. More specifically, the cutting tool 101 is placed on the turret 50A, and is sandwiched and fixed from above by the turret 50B. The cutting tool 101 performs cutting while being fixed by the tool rests 50A and 50B.

FIG. 3 is a cross-sectional view showing the configuration of a cutting tool according to the first embodiment of the present disclosure. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. With reference to FIG. 3, the shank 10 includes four surfaces surrounding a virtual axis 17. More specifically, the shank 10 is adjacent to the bottom surface S1 which is a surface mounted on the tool post 50A, the top surface S2 which is a surface facing the bottom surface S1, and the top surface S2 when viewed from the chip 1 side in the clockwise direction. A side surface S3 which is a surface to be used and a side surface S4 which is a surface facing the side surface S3 are included. In the following, for the sake of explanation, the direction parallel to the bottom surface S1 and orthogonal to the axis 17 is the X direction, the direction orthogonal to the bottom surface S1 is the Y direction, and the direction parallel to the axis 17 is the Z direction. The X direction is a direction parallel to the above-mentioned width direction WD, and is an example of the first direction. The Y direction is a direction parallel to the above-mentioned height direction HD, and is an example of the second direction. The Z direction is an example of the third direction. In FIG. 3, the virtual line VL1 passing through the axis 17 and parallel to the X direction, the virtual line VL2 passing through the axis 17 and parallel to the Y direction, the boundary portion between the shaft 17, the upper surface S2 and the side surface S4, and the bottom surface S1. The virtual line VL3 passing through the boundary portion of the side surface S3 and the virtual line VL4 passing through the boundary portion of the shaft 17, the upper surface S2 and the side surface S3, and the boundary portion of the bottom surface S1 and the side surface S4 are shown by broken lines.

In the following, for the sake of explanation, in the XY plane including the X direction and the Y direction, the region on the side surface S4 side of the axis 17 and the region between the virtual line VL1 and the virtual line VL3 is referred to as the first quadrant Q1. Refer to. Further, in the XY plane, the region on the upper surface S2 side of the axis 17 and the region between the virtual line VL3 and the virtual line VL2 is referred to as the second quadrant Q2, and is the region on the upper surface S2 side of the axis 17. The region between the virtual line VL2 and the virtual line VL4 is referred to as the third quadrant Q3, and the region on the side surface S3 side of the axis 17 and the region between the virtual line VL4 and the virtual line VL1 is the fourth. It is referred to as quadrant Q4 and is a region on the side surface S3 side of the axis 17, and a region between the virtual line VL1 and the virtual line VL3 is referred to as a fifth quadrant Q5 and is a region on the bottom surface S1 side of the axis 17. The region between the virtual line VL3 and the virtual line VL2 is referred to as the sixth quadrant Q6, and the region on the bottom surface S1 side of the axis 17 and the region between the virtual line VL2 and the virtual line VL4 is referred to as the seventh quadrant. It is referred to as Q7, and the region on the side surface S4 side of the axis 17 and between the virtual line VL4 and the virtual line VL1 is referred to as the eighth quadrant Q8.

In the cutting tool 101, the reference point 1K exists at an arbitrary position. For example, the position of the reference point 1K in the XY plane is the first quadrant Q1, the second quadrant Q2, the third quadrant Q3, the fourth quadrant Q4, the fifth quadrant Q5, the sixth quadrant Q6, the seventh quadrant Q7, and the eighth quadrant. It may be in any region of Q8. Specifically, the position of the reference point 1K on the XY plane may be any of the positions PK1 to PK8 shown in FIG. Further, the position of the reference point 1K on the XY plane may be the position PK9 near the boundary between the second quadrant Q2 and the third quadrant Q3, or the position near the boundary between the sixth quadrant Q6 and the seventh quadrant Q7. It may be PK10, the position PK11 near the boundary between the 8th quadrant Q8 and the 1st quadrant Q1, or the position PK12 near the boundary between the 4th quadrant Q4 and the 5th quadrant Q5. May be good.

With reference to FIG. 2 again, the strain sensor 20 measures the strain of the shank 10 during cutting, and transmits, for example, an analog signal at a level corresponding to the strain to a wireless communication device (not shown) via a signal line (not shown). .. The wireless communication device includes, for example, a communication circuit such as a communication IC (Integrated Circuit). The strain sensor 20 and the wireless communication device receive power from a battery (not shown) via a power line (not shown). The wireless communication device AD (Analog Digital) converts the analog signal received from the strain sensor 20 at a predetermined sampling cycle, and generates a sensor measurement value which is a converted digital value. More specifically, the wireless communication device generates the sensor measurement value s by AD-converting the analog signal received from the strain sensor 20. The wireless communication device assigns a time stamp indicating the sampling timing to the generated sensor measurement value s, and stores the sensor measurement value s to which the time stamp is attached in a storage unit (not shown). With reference to FIG. 1 again, the wireless communication device acquires one or more sensor measurement values s from the storage unit, for example, at a predetermined cycle, and generates and generates a radio signal including the acquired sensor measurement values s. The radio signal is transmitted to the processing device 201.

[Processing device]
FIG. 4 is a diagram showing a configuration of a processing device in the cutting system according to the first embodiment of the present disclosure. With reference to FIG. 4, the processing device 201 includes a wireless communication unit 110, a processing unit 120, and a storage unit 130. The wireless communication unit 110 is realized by a communication circuit such as a communication IC. The processing unit 120 is realized by a processor such as a CPU (Central Processing Unit) and a DSP (Digital Signal Processor), for example. The storage unit 130 is, for example, a non-volatile memory. The wireless communication unit 110 wirelessly communicates with the wireless communication device in the cutting tool 101. The wireless communication device and the wireless communication unit 110 are, for example, compliant with ZigBee (registered trademark) compliant with IEEE 802.15.4, Bluetooth® compliant with IEEE 802.15.1, and IEEE 802.15.3a. Wireless communication is performed using a communication protocol such as UWB (Ultra Wide Band). A communication protocol other than the above may be used between the wireless communication device and the wireless communication unit 110. The wireless communication unit 110 acquires the sensor measurement value s from the wireless signal received from the wireless communication device in the cutting tool 101, and stores the acquired sensor measurement value s in the storage unit 130. The processing unit 120 detects an abnormality related to the cutting tool 101 by analyzing the sensor measurement value s stored in the storage unit 130 by the wireless communication unit 110.

[Strain sensor]
FIG. 5 is a diagram showing an example of the configuration of a cutting tool according to the first embodiment of the present disclosure. The chip 1 according to the first embodiment has a reference point 1K1 which is a reference point 1K. The position of the reference point 1K1 is an example of the position PK1 shown in FIG. With reference to FIG. 5, the cutting tool 101 includes

strain sensors

20A, 20B, 20C as strain sensors 20. For example, the

strain sensors

20A and 20C are mounted on the side surface S4 of the shank 10. Further, for example, the strain sensor 20B is mounted on the upper surface S2 of the shank 10.

For example, at least two of the strain sensors 20 are shear strain sensors capable of measuring the shear strain of the shank 10. Further, for example, at least one of the strain sensors 20 is a vertical strain sensor capable of measuring the vertical strain of the shank 10. As described above, due to the configuration in which at least one of the strain sensors 20 is a vertical strain sensor, it is possible to measure the vertical strain generated by the load in the Z direction, which is difficult to measure with the shear strain sensor. can. As an example, the

strain sensors

20A and 20B are shear strain sensors. Further, as an example, the strain sensor 20C is a vertical strain sensor.

The strain sensor 20A measures the shear strain εyz of the shank 10 at the mounting position of the strain sensor 20A. More specifically, the strain sensor 20A is, for example, parallel to the measurement axis a1 which is parallel to the side surface S4 of the shank 10 and has an angle of 45 ° with the axis 17, and is parallel to the side surface S4 of the shank 10. And has a measurement axis a2 orthogonal to the measurement axis a1. The strain sensor 20A measures the strain sa1 in the direction of the measurement axis a1 and the strain sa2 in the direction of the measurement axis a2, and the analog signal Asa1 at the level corresponding to the strain sa1 and the analog signal Asa2 at the level corresponding to the strain sa2. Is output to the above-mentioned wireless communication device as an analog signal ASyz corresponding to the shear strain εyz. The strain sensor 20A may be configured to output the analog signal Asa1 and the analog signal Asa2 to the wireless communication device, respectively, instead of the analog signal ASyz.

The strain sensor 20B measures the shear strain εxz of the shank 10 at the mounting position of the strain sensor 20B. More specifically, the strain sensor 20B is, for example, parallel to the measurement axis b1 which is parallel to the upper surface S2 of the shank 10 and has an angle of 45 ° with the shaft 17, and is parallel to the upper surface S2 of the shank 10. And has a measurement axis b2 orthogonal to the measurement axis b1. The strain sensor 20B measures the strain sb1 in the direction of the measurement axis b1 and the strain sb2 in the direction of the measurement axis b2, and has an analog signal ASb1 at a level corresponding to the strain sb1 and an analog signal ASb2 at a level corresponding to the strain sb2. Is output to the above-mentioned wireless communication device as an analog signal ASxz corresponding to the shear strain εxz. The strain sensor 20B may be configured to output the analog signal ASb1 and the analog signal ASb2 to the wireless communication device, respectively, instead of the analog signal ASxz.

The strain sensor 20C measures the vertical strain εzz of the shank 10 at the mounting position of the strain sensor 20C. More specifically, the strain sensor 20C has, for example, a measurement axis c1 parallel to the axis 17. The strain sensor 20C measures the strain sc1 in the direction of the measurement axis c1 and outputs an analog signal ASc1 at a level corresponding to the strain sc1 to the above-mentioned wireless communication device as an analog signal ASzz corresponding to the vertical strain εzzz.

Hereinafter, the load in the X direction applied to the shank 10 is also referred to as a load Fx, the load in the Y direction applied to the shank 10 is also referred to as a load Fy, and the load in the Z direction applied to the shank 10 is also referred to as a load Fz. The load Fx is an example of the first load, the load Fy is an example of the second load, and the load Fz is an example of the third load.

For example, one of the

strain sensors

20A and 20B has the maximum sensitivity to the load Fx among the loads Fx, Fy and Fz, and the other of the

strain sensors

20A and 20B has the maximum sensitivity among the loads Fx, Fy and Fz. It has the maximum sensitivity to the load Fy. With such a configuration, it is possible to calculate two of the three component forces of the cutting resistance based on the measurement results of the

strain sensors

20A and 20B at the time of cutting. Further, for example, the strain sensor 20C has the maximum sensitivity to the load Fz among the loads Fx, Fy, and Fz. With such a configuration, it is possible to calculate the component force in the Z direction out of the three component forces of the cutting resistance based on the measurement result of the strain sensor 20C at the time of cutting.

As an example, the strain sensor 20A has the maximum sensitivity to the load Fy. More specifically, the magnitude of the analog signal ASyz output from the strain sensor 20A when a load Fy of a certain magnitude is applied to the shank 10 is when a load Fx having the same magnitude as the load Fy is applied to the shank 10. The magnitude of the analog signal ASyz output from the strain sensor 20A and the magnitude of the analog signal ASyz output from the strain sensor 20A when a load Fz having the same magnitude as the load Fy is applied to the shank 10.

Further, as an example, the strain sensor 20B has the maximum sensitivity to the load Fx. More specifically, the magnitude of the analog signal ASxz output from the strain sensor 20B when a load Fx of a certain magnitude is applied to the shank 10 is when a load Fy having the same magnitude as the load Fx is applied to the shank 10. The magnitude of the analog signal ASxz output from the strain sensor 20B and the magnitude of the analog signal ASxz output from the strain sensor 20B when a load Fz having the same magnitude as the load Fx is applied to the shank 10.

Further, as described above, the strain sensor 20C has the maximum sensitivity to the load Fz. More specifically, the magnitude of the analog signal ASzz output from the strain sensor 20C when a load Fz of a certain magnitude is applied to the shank 10 is when a load Fx having the same magnitude as the load Fz is applied to the shank 10. The magnitude of the analog signal ASzz output from the strain sensor 20C and the magnitude of the analog signal ASzz output from the strain sensor 20C when a load Fy having the same magnitude as the load Fz is applied to the shank 10.

Therefore, by checking the analog signal output from the strain sensor 20 when a load of known magnitude and direction is applied to the shank 10, which load the strain sensor 20 has the maximum sensitivity to. Can be confirmed. Further, the relationship between the load at the position where the strain sensor 20 is attached and the vertical strain and the shear strain is simulated, and the analog signal output from the strain sensor 20 and the simulation result when a known load is applied to the shank 10 are used. Based on this, it is possible to confirm whether the strain sensor 20 is a vertical strain sensor or a shear strain sensor.

(Mounting position of strain sensor 20A in the axial direction)
FIG. 6 is a cross-sectional view showing the configuration of a cutting tool according to the first embodiment of the present disclosure. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. In FIG. 6, the position of the chip 1 and the position of the reference point 1K1 when the reference point 1K1 is translated along the Z direction to the cross section seen by the VI-VI line are indicated by broken lines and black circles, respectively. With reference to FIG. 6, the shank height of the shank 10 in the VI-VI line arrow cross section is defined as Wa. For example, Wa is equal to the shank height W described above. Hereinafter, in the modification described later, Wa is also assumed to be equal to the shank height W. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20A in the X direction and the reference point 1K of the cutting edge in the chip 1 is defined as the distance dxa. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20A in the Y direction and the reference point 1K is defined as the distance dya. The mounting position of the strain sensor 20 means, for example, the center of the contact surface of the strain sensor 20 with the shank 10.

When the distance dxa and the distance dya are different values from each other, the larger one of the distance dxa and the distance dya is defined as maxdxya, and the smaller one is defined as mindxya. When the distance dxa and the distance dya are equal values, the distance dxa and the distance dya are set to maxdxya. In the example shown in FIG. 6, the distance dxa and the distance dya are different values from each other, and the distance dxa is larger than the distance dya. Therefore, the distance dxa is set to maxdxya, and the distance dya is set to mindxya. With reference to FIG. 5 again, at this time, assuming that the distance between the mounting position of the strain sensor 20A and the reference point 1K in the Z direction is the sensor distance Da, the sensor distance Da satisfies the following equation (9).
Da <0.74W + 2.09maxdxya ... (9)

As described above, due to the configuration in which the sensor distance Da of the strain sensor 20A, which is the shear strain sensor, satisfies the equation (9), the load Fx or the load Fy is applied as compared with the configuration in which the vertical strain sensor is used instead of the strain sensor 20A. The shear strain generated by the above can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

Preferably, the sensor distance Da satisfies the following equation (10).
Da <0.74W + 2.09mindxya ... (10)

Due to the configuration in which the sensor distance Da satisfies the equation (10) in addition to the equation (9), the shear caused by the load Fx or the load Fy is applied as compared with the configuration in which the vertical strain sensor is used instead of the strain sensor 20A. The strain can be measured with even higher sensitivity.

(Mounting position of strain sensor 20B in the axial direction)
FIG. 7 is a cross-sectional view showing the configuration of a cutting tool according to the first embodiment of the present disclosure. FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. In FIG. 7, the position of the chip 1 and the position of the reference point 1K1 when the reference point 1K1 is translated along the Z direction to the VII-VII line arrow cross section are shown by broken lines and black circles, respectively. With reference to FIG. 7, the shank height of the shank 10 in the VII-VII line arrow cross section is defined as Wb. For example, Wb is equal to the shank height W described above. Hereinafter, similarly, in the modification described later, Wb is assumed to be equal to the shank height W. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20B in the X direction and the reference point 1K is defined as the distance dxb. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20A in the Y direction and the reference point 1K is defined as the distance dyb.

When the distance dxb and the distance dyb have different values, the larger one of the distance dxb and the distance dyb is defined as maxdxyb, and the smaller one is defined as mindxyb. When the distance dxb and the distance dyb are equal values, the distance dxb and the distance dyb are set to maxdxyb. In the example shown in FIG. 7, the distance dxb and the distance dyb are different values from each other, and the distance dxb is larger than the distance dyb. Therefore, the distance dxb is set to maxdxyb, and the distance dyb is set to mindxyb. With reference to FIG. 5 again, at this time, for example, assuming that the distance between the mounting position of the strain sensor 20B and the reference point 1K in the Z direction is the sensor distance Db, the sensor distance Db has the following equation (11). Fulfill.
Db <0.74W + 2.09mindxyb ... (11)

As described above, due to the configuration in which the sensor distance Db of the strain sensor 20B, which is a shear strain sensor, satisfies the equation (11), the load Fx or the load Fy is applied as compared with the configuration in which the vertical strain sensor is used instead of the strain sensor 20B. The shear strain generated by the above can be measured with higher sensitivity.

(Mounting position of strain sensor 20A in the circumferential direction)
The strain sensor 20A is mounted in the middle region of the three regions when the mounting surface of the strain sensor 20A among the four surfaces of the shank 10 is divided into three equal regions arranged in the circumferential direction of the shank 10. Will be done.

FIG. 8 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. In FIG. 8, the position of the reference point 1K1 when the reference point 1K1 is translated along the Z direction to the cross section of the VIII-VIII line arrow is indicated by a black circle. FIG. 8 also shows the reference points 1K2 to 1K12 in the modified examples 1 to 11 described later, but the case where the chip 1 has the reference points 1K2 to 1K12 will be described in the modified examples 1 to 11. With reference to FIG. 8, preferably, the strain sensor 20A is mounted on the side surface S4, which is the surface closest to the reference point 1K1 among the four surfaces of the shank 10. When the strain sensor 20A is mounted on the side surface S4, when the side surface S4 is divided into three equal regions S4Aa, S4Ab, and S4Ac arranged in the circumferential direction of the shank 10, the strain sensor 20A is located in the middle region S4Ab of the regions S4Aa, S4Ab, and S4Ac. It will be installed. In the example shown in FIG. 8, the side surface S4 is an example of the first surface. Here, the surface closest to the reference point 1K1 among the four surfaces of the shank 10 is the surface having the shortest distance from the straight line passing through the reference point 1K1 and parallel to the axis 17.

The strain sensor 20A may be mounted on a surface other than the surface closest to the reference point 1K1. For example, the strain sensor 20A may be mounted on the upper surface S2. In this case, the strain sensor 20A is mounted on the region S2Ab. Further, for example, the strain sensor 20A may be mounted on the bottom surface S1. In this case, the strain sensor 20A is mounted in the region S1Ab. Further, for example, the strain sensor 20A may be mounted on the side surface S3. In this case, the strain sensor 20A is mounted in the region S3Ab.

As described above, due to the configuration in which the strain sensor 20A, which is a shear strain sensor, is mounted in the middle region of the three equally divided regions on the mounting surface, the shear generated when the load Fx or the load Fy is applied. The strain can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor. Further, by mounting the strain sensor 20A on the side surface S4 which is the surface closest to the reference point 1K1 among the four surfaces of the shank 10, the shear strain of the shank 10 can be measured with even higher sensitivity.

FIG. 9 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. In FIG. 9, the position of the reference point 1K1 when the reference point 1K1 is translated along the Z direction to the IX-IX line arrow cross section is indicated by a black circle. FIG. 9 also shows the reference points 1K2 to 1K12 in the modified examples 1 to 11 described later, but the case where the chip 1 has the reference points 1K2 to 1K12 will be described in the modified examples 1 to 11. With reference to FIG. 9, preferably, the strain sensor 20A divides the side surface S4 into five regions S4Ad, S4Ae, S4Af, S4Ag, S4Ah arranged in the circumferential direction of the shank 10 into five equal regions S4Ad, S4Ae. , S4Af, S4Ag, S4Ah, which is mounted in the middle region S4Af. For example, the strain sensor 20A may be mounted on the region S2Af on the upper surface S2, the region S1Af on the bottom surface S1, or the region S3Af on the side surface S3.

As described above, the shear strain of the shank 10 can be measured with even higher sensitivity by mounting the strain sensor 20A in the middle region of the five equally divided regions on the mounting surface.

(Mounting position of strain sensor 20B in the circumferential direction)
For example, when the strain sensor 20B divides the adjacent surface of the four surfaces of the shank 10 adjacent to the mounting surface of the strain sensor 20A into three regions arranged in the circumferential direction of the shank 10, the three regions are divided into three equal regions. It will be installed in the middle area of our house.

FIG. 10 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 10 is a cross-sectional view taken along the line XX in FIG. In FIG. 10, the position of the reference point 1K1 when the reference point 1K1 is translated along the Z direction to the cross section seen by the XX line is indicated by a black circle. FIG. 10 also shows the reference points 1K2 to 1K12 in the modified examples 1 to 11 described later, but the case where the chip 1 has the reference points 1K2 to 1K12 will be described in the modified examples 1 to 11. With reference to FIG. 10, preferably, the strain sensor 20B is mounted on the upper surface S2, which is the second closest surface to the reference point 1K1 among the four surfaces of the shank 10. With such a configuration, the

strain sensors

20A and 20B can be used to measure the shear strain on each of the two surfaces of the shank 10 with even higher sensitivity. When the strain sensor 20B is mounted on the upper surface S2, when the upper surface S2 is divided into three equal regions S2Ba, S2Bb, and S2Bc arranged in the circumferential direction of the shank 10, the strain sensor 20B is located in the middle region S2Bb of the regions S2Ba, S2Bb, and S2Bc. It will be installed. In the example shown in FIG. 10, the upper surface S2 is an example of the second surface. Here, the surface second closest to the reference point 1K1 among the four surfaces of the shank 10 passes through the reference point 1K1 and is parallel to the axis 17 among the three surfaces excluding the surface closest to the reference point 1K1. The surface with the shortest distance from the straight line.

The strain sensor 20B may be mounted on a surface other than the surface second closest to the reference point 1K1. For example, the strain sensor 20B may be mounted on the bottom surface S1. In this case, the strain sensor 20B is mounted in the region S1Bb. Further, for example, the strain sensor 20B may be mounted on the side surface S4 when the strain sensor 20A is mounted on the bottom surface S1 or the top surface S2. In this case, the strain sensor 20B is mounted on the region S4Bb. Further, for example, the strain sensor 20B may be mounted on the side surface S3 when the strain sensor 20A is mounted on the bottom surface S1 or the top surface S2. In this case, the strain sensor 20B is mounted on the region S3Bb.

In this way, the load Fx or the load Fy is applied by the configuration in which the strain sensor 20B, which is a shear strain sensor, is mounted in the middle region of the three equally divided regions on the mounting surface of the strain sensor 20B. The accompanying shear strain can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor. Further, since the strain sensor 20B is mounted on the surface adjacent to the mounting surface of the strain sensor 20A, the shear strain on each of the two surfaces of the shank 10 can be measured with higher sensitivity.

FIG. 11 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. In FIG. 11, the position of the reference point 1K1 when the reference point 1K1 is translated along the Z direction to the cross section of the XI-XI line arrow is indicated by a black circle. FIG. 11 also shows the reference points 1K2 to 1K12 in the modified examples 1 to 11 described later, but the case where the chip 1 has the reference points 1K2 to 1K12 will be described in the modified examples 1 to 11. With reference to FIG. 11, for example, in the strain sensor 20B, when the upper surface S2 is divided into five regions S2Bd, S2Be, S2Bf, S2Bg, and S2Bh arranged in the circumferential direction of the shank 10, the five regions S2Bd, S2Be, It is mounted in the middle region S2Bf of S2Bf, S2Bg, and S2Bh. For example, the strain sensor 20B may be mounted on the region S1Bf on the bottom surface S1, the region S4Bf on the side surface S4, or the region S3Bf on the side surface S3.

As described above, the shear strain of the shank 10 can be measured with even higher sensitivity by mounting the strain sensor 20B in the middle region of the five equally divided regions on the mounting surface. Further, since the strain sensor 20B is mounted on the surface adjacent to the mounting surface of the strain sensor 20A, the shear strain on each of the two surfaces of the shank 10 can be measured with higher sensitivity.

(Mounting position of strain sensor 20C in the circumferential direction)

FIG. 12 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 12 is a cross-sectional view taken along the line XII-XII in FIG. In FIG. 12, the position of the reference point 1K1 when the reference point 1K1 is translated along the Z direction to the XII-XII line arrow cross section is indicated by a black circle. FIG. 12 also shows the reference points 1K2 to 1K12 in the modified examples 1 to 11 described later, but the case where the chip 1 has the reference points 1K2 to 1K12 will be described in the modified examples 1 to 11. With reference to FIG. 12, the strain sensor 20C has a region closest to the reference point 1K1 on the surface closest to the reference point 1K1 among the four surfaces of the shank 10, and a reference point 1K1 on the surface second closest to the reference point 1K1. At least one of four regions: the region closest to, the region farthest from the reference point 1K1 on the facing surface of the closest surface, and the region farthest from the reference point 1K1 on the facing surface of the second closest surface. Mounted in the area. More specifically, the strain sensor 20C is mounted in at least one region of the region S4Ca, the region S2Ca, the region S3Cc, and the region S1Cc. Here, the region S4Ca is the region closest to the reference point 1K1 among the regions S4Ca, S4Cb, and S4Cc in which the side surface S4 is divided into three equal parts along the circumferential direction of the shank 10. Further, the region S2Ca is a region closest to the reference point 1K1 among the regions S2Ca, S2Cb, and S2Cc in which the upper surface S2 is divided into three equal parts along the circumferential direction of the shank 10. Further, the region S3Cc is the region farthest from the reference point 1K1 among the regions S3Ca, S3Cb, and S3Cc in which the side surface S3 is divided into three equal parts along the circumferential direction of the shank 10. Further, the region S1Cc is the region farthest from the reference point 1K1 among the regions S1Ca, S1Cb, and S1Cc obtained by dividing the bottom surface S1 into three equal parts along the circumferential direction of the shank 10. In the example shown in FIG. 12, the side surface S4 is an example of the first surface, the upper surface S2 is an example of the second surface, the side surface S3 is an example of the third surface, and the bottom surface S1 is an example of the fourth surface. ..

In this way, the strain sensor 20C, which is a vertical strain sensor, is mounted in the vicinity of the boundary portion closest to the reference point 1K1 or in the vicinity of the boundary portion farthest from the reference point 1K1 in the boundary portion of the surface of the shank 10. Depending on the configuration, the vertical strain generated by the load in the Z direction can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

FIG. 13 is a diagram showing an example of a mounting position of a strain sensor in a cutting tool according to the first embodiment of the present disclosure. FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. In FIG. 13, the position of the reference point 1K1 when the reference point 1K1 is translated along the Z direction to the XIII-XIII line arrow cross section is indicated by a black circle. FIG. 13 also shows the reference points 1K2 to 1K12 in the modified examples 1 to 11 described later, but the case where the chip 1 has the reference points 1K2 to 1K12 will be described in the modified examples 1 to 11. With reference to FIG. 13, the strain sensor 20C is mounted in at least one of the above four regions. More specifically, the strain sensor 20C is mounted in at least one region of the region S4Cd, the region S2Cd, the region S3Ch, and the region S1Ch. Here, the region S4Cd is the region closest to the reference point 1K1 among the regions S4Cd, S4Ce, S4Cf, S4Cg, and S4Ch obtained by dividing the side surface S4 into five equal parts along the circumferential direction of the shank 10. Further, the region S2Cd is a region closest to the reference point 1K1 among the regions S2Cd, S2Ce, S2Cf, S2Cg, and S2Ch obtained by dividing the upper surface S2 into five equal parts along the circumferential direction of the shank 10. Further, the region S3Ch is the region farthest from the reference point 1K1 among the regions S3Cd, S3Ce, S3Cf, S3Cg, and S3Ch in which the side surface S3 is divided into five equal parts along the circumferential direction of the shank 10. Further, the region S1Ch is the region farthest from the reference point 1K1 of the regions S1Cd, S1Ce, S1Cf, S1Cg, and S1Ch obtained by dividing the bottom surface S1 into five equal parts along the circumferential direction of the shank 10.

In this way, by mounting the strain sensor 20C at a position extremely close to the boundary portion closest to the reference point 1K1 or at a position extremely close to the boundary portion farthest from the reference point 1K1, the vertical strain in the shank 10 is more sensitive. Can be measured with.

According to the cutting tool 101 of the present embodiment, it is possible to calculate the three-component force of the cutting resistance based on the measurement results of the three

strain sensors

20A, 20B, and 20C at the time of cutting.

[Modification 1]
FIG. 14 is a diagram showing an example of the configuration of the cutting tool according to the first modification of the first embodiment of the present disclosure. The chip 1 according to the modification 1 has a reference point 1K2 which is a reference point 1K. It is assumed that the position of the reference point 1K2 in the XY plane is within the region of the second quadrant Q2 shown in FIG. The position of the reference point 1K2 is an example of the position PK2 shown in FIG. With reference to FIG. 14, the cutting tool 101A includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

(Mounting position of strain sensor 20B in the axial direction)
FIG. 15 is a cross-sectional view showing the configuration of the cutting tool according to the first modification of the first embodiment of the present disclosure. FIG. 15 is a cross-sectional view taken along the line XV-XV in FIG. In FIG. 15, the position of the chip 1 and the position of the reference point 1K2 when the reference point 1K2 is translated along the Z direction to the XV-XV line arrow cross section are shown by broken lines and black circles, respectively. With reference to FIG. 15, since the distance dxb and the distance dyb have different values and the distance dyb is larger than the distance dxb, the distance dxyb is defined as maxdxyb and the distance dxb is defined as mindxyb. With reference to FIG. 14 again, at this time, the sensor distance Db satisfies the following equation (12).
Db <0.74W + 2.09maxdxyb ... (12)

As described above, due to the configuration in which the sensor distance Db of the strain sensor 20B, which is a shear strain sensor, satisfies the equation (12), the load Fx or the load Fy is applied as compared with the configuration in which the vertical strain sensor is used instead of the strain sensor 20B. The shear strain generated by the above can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

Preferably, the sensor distance Db satisfies the above equation (11). Due to the configuration in which the sensor distance Db satisfies the equation (11) in addition to the equation (12), the shear caused by the load Fx or the load Fy is applied as compared with the configuration in which the vertical strain sensor is used instead of the shear strain sensor. The strain can be measured with even higher sensitivity.

(Mounting position of strain sensor 20A in the axial direction)
FIG. 16 is a cross-sectional view showing the configuration of the cutting tool according to the first modification of the first embodiment of the present disclosure. FIG. 16 is a cross-sectional view taken along the line XVI-XVI in FIG. In FIG. 16, the position of the chip 1 and the position of the reference point 1K2 when the reference point 1K2 is translated along the Z direction to the XVI-XVI line arrow cross section are shown by broken lines and black circles, respectively. With reference to FIG. 16, since the distance dxa and the distance dya are different values from each other and the distance dya is larger than the distance dxa, the distance dya is defined as maxdxya and the distance dxa is defined as mindxya. With reference to FIG. 14 again, at this time, for example, the sensor distance Da satisfies the above equation (10).

As described above, due to the configuration in which the sensor distance Da of the strain sensor 20A, which is the shear strain sensor, satisfies the equation (10), the load Fx or the load Fy is applied as compared with the configuration in which the vertical strain sensor is used instead of the strain sensor 20A. The shear strain generated by the above can be measured with higher sensitivity.

(Mounting position of strain sensor 20B in the circumferential direction)
In the cutting tool 101A according to the first modification, the mounting position of the strain sensor 20B in the circumferential direction is the same as the mounting position of the strain sensor 20B in the circumferential direction in the cutting tool 101 according to the first embodiment. For example, the strain sensor 20B is mounted in the region S2Bb, which is the middle region of the upper surface S2, which is the surface closest to the reference point 1K2 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20A in the circumferential direction)
In the cutting tool 101A according to the first modification, the mounting position of the strain sensor 20A in the circumferential direction is the same as the mounting position of the strain sensor 20A in the circumferential direction in the cutting tool 101 according to the first embodiment. For example, the strain sensor 20A is mounted in a region S4Ab which is a middle region on the side surface S4 which is adjacent to the upper surface S2 and is the second closest surface to the reference point 1K2 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20C in the circumferential direction)
In the cutting tool 101A according to the first modification, the mounting position of the strain sensor 20C in the circumferential direction is the same as the mounting position of the strain sensor 20C in the circumferential direction in the cutting tool 101 according to the first embodiment. For example, the strain sensor 20C is mounted on the region S4Ca on the side surface S4, which is the surface second closest to the reference point 1K2 of the four surfaces of the shank 10.

[Modification 2]
FIG. 17 is a diagram showing an example of the configuration of the cutting tool according to the second modification of the first embodiment of the present disclosure. In FIG. 17, the

strain sensors

20A and 20C mounted on the side surface S3 of the shank 10 are shown by broken lines. The chip 1 according to the second modification has a reference point 1K3 which is a reference point 1K. It is assumed that the position of the reference point 1K3 in the XY plane is within the region of the fourth quadrant Q4 shown in FIG. The position of the reference point 1K3 is an example of the position PK4 shown in FIG. With reference to FIG. 17, the cutting tool 101B includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

20A and 20C are mounted on the side surface S3 of the shank 10. Further, for example, the strain sensor 20B is mounted on the upper surface S2 of the shank 10.

(Mounting position of strain sensor 20A in the axial direction)
FIG. 18 is a cross-sectional view showing the configuration of the cutting tool according to the second modification of the first embodiment of the present disclosure. FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII in FIG. In FIG. 18, the position of the reference point 1K3 when the reference point 1K3 is translated along the Z direction to the cross section seen by the XVIII-XVIII line arrow is indicated by a black circle. Here, the relationship between the distance dxa, the distance dya, maxdxya, mindxya, and the sensor distance Da is the same as that of the first embodiment described above. That is, with reference to FIG. 18, since the distance dxa and the distance dya are different values from each other and the distance dxa is larger than the distance dya, the distance dxa is set to maxdxya and the distance dyb is set to mindxya. At this time, referring to FIG. 17 again, for example, the sensor distance Da satisfies the above equation (9). Further, for example, the sensor distance Da satisfies the above equation (10).

(Mounting position of strain sensor 20B in the axial direction)
FIG. 19 is a cross-sectional view showing the configuration of the cutting tool according to the second modification of the first embodiment of the present disclosure. FIG. 19 is a cross-sectional view taken along the line XIX-XIX in FIG. In FIG. 19, the position of the reference point 1K3 when the reference point 1K3 is translated along the Z direction to the cross section seen by the XIX-XIX line arrow is indicated by a black circle. Here, the relationship between the distance dxb, the distance dyb, the maxdxyb, the mindxyb, and the sensor distance Db is the same as in the first embodiment described above. That is, with reference to FIG. 19, since the distance dxb and the distance dyb have different values and the distance dxb is larger than the distance dyb, the distance dxb is defined as maxdxyb and the distance dyb is defined as mindxyb. At this time, referring to FIG. 17 again, for example, the sensor distance Db satisfies the above equation (11).

(Mounting position of strain sensor 20A in the circumferential direction)
Preferably, the strain sensor 20A is mounted on the side surface S3, which is the surface closest to the reference point 1K3 among the four surfaces of the shank 10. In this case, when the strain sensor 20A regards FIG. 8 as a cross-sectional view (cross-sectional view taken along the line XVIII-XVIII in FIG. 17) at the mounting position of the strain sensor 20A of the cutting tool 101B according to the modification 2. It is mounted in the area S3Ab shown in FIG. The strain sensor 20A may be mounted in the region S1Ab, the region S2Ab, and the region S4Ab shown in FIG.

More preferably, when the strain sensor 20A is regarded as a cross-sectional view (cross-sectional view taken along the line XVIII-XVIII in FIG. 17) at the mounting position of the strain sensor 20A of the cutting tool 101B according to the modification 2. , It is mounted on the region S3Af on the side surface S3 shown in FIG. The strain sensor 20A may be mounted in the region S1Af, the region S2Af, and the region S4Af shown in FIG.

(Mounting position of strain sensor 20B in the circumferential direction)
In the cutting tool 101B according to the second modification, the mounting position of the strain sensor 20B in the circumferential direction is the same as the mounting position of the strain sensor 20B in the circumferential direction in the cutting tool 101 according to the first embodiment. For example, the strain sensor 20B is mounted in the region S2Bb on the top surface S2, which is adjacent to the side surface S3 and is the second closest surface to the reference point 1K3 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20C in the circumferential direction)
Similar to the above, the strain sensor 20C is the region closest to the reference point 1K3 on the surface closest to the reference point 1K3 among the four surfaces of the shank 10, and is closest to the reference point 1K3 on the surface second closest to the reference point 1K3. Mounted in at least one of four regions: a near region, a region farthest from the reference point 1K3 on the facing surface of the closest surface, and a region farthest from the reference point 1K3 on the facing surface of the second closest surface. Will be done. More specifically, when the strain sensor 20C regards FIG. 12 as a cross-sectional view (AA-AA line cross-sectional view in FIG. 17) at the mounting position of the strain sensor 20C of the cutting tool 101B according to the modification 2. In, at least one of the regions S3Ca, S1Ca, S2Cc, and S4Cc shown in FIG. 12, for example, is mounted on the region S3Ca. Further, the strain sensor 20C is shown in the case where FIG. 13 is regarded as a cross-sectional view (AA-AA line arrow cross-sectional view in FIG. 17) at the mounting position of the strain sensor 20C of the cutting tool 101B according to the modification 2. It is mounted in at least one of the regions S3Cd, S1Cd, S2Ch, and S4Ch shown in 13, for example, the region S3Cd.

[Modification 3]
FIG. 20 is a diagram showing an example of the configuration of a cutting tool according to the third modification of the first embodiment of the present disclosure. In FIG. 20, the

strain sensors

20A and 20C mounted on the side surface S3 of the shank 10 are shown by broken lines. The chip 1 according to the modification 3 has a reference point 1K4 which is a reference point 1K. It is assumed that the position of the reference point 1K4 in the XY plane is within the region of the third quadrant Q3 shown in FIG. The position of the reference point 1K4 is an example of the position PK3 shown in FIG. With reference to FIG. 20, the cutting tool 101C includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

(Mounting position of strain sensor 20B in the axial direction)
FIG. 21 is a cross-sectional view showing the configuration of the cutting tool according to the third modification of the first embodiment of the present disclosure. FIG. 21 is a cross-sectional view taken along the line XXI-XXI in FIG. 20. In FIG. 21, the position of the reference point 1K4 when the reference point 1K4 is translated along the Z direction to the cross section seen by the XXI-XXI line arrow is indicated by a black circle. Here, the relationship between the distance dxb, the distance dyb, the maxdxyb, the mindxyb, and the sensor distance Db is the same as that of the above-mentioned modification 1. That is, with reference to FIG. 21, since the distance dxb and the distance dyb have different values and the distance dyb is larger than the distance dxb, the distance dxyb is defined as maxdxyb and the distance dxb is defined as mindxyb. At this time, referring to FIG. 20 again, for example, the sensor distance Db satisfies the above equation (12). Further, for example, the sensor distance Db satisfies the above equation (11).

(Mounting position of strain sensor 20A in the axial direction)
FIG. 22 is a cross-sectional view showing the configuration of the cutting tool according to the third modification of the first embodiment of the present disclosure. FIG. 22 is a cross-sectional view taken along the line XXII-XXII in FIG. In FIG. 22, the position of the reference point 1K4 when the reference point 1K4 is translated along the Z direction to the cross section of the XXII-XXII line arrow is indicated by a black circle. Here, the relationship between the distance dxa, the distance dya, maxdxya, mindxya, and the sensor distance Da is the same as that of the above-mentioned modification 1. That is, with reference to FIG. 22, since the distance dxa and the distance dya are different values from each other and the distance dya is larger than the distance dxa, the distance dya is set to maxdxya and the distance dxa is set to mindxya. At this time, referring to FIG. 20 again, for example, the sensor distance Da satisfies the above equation (10).

(Mounting position of strain sensor 20B in the circumferential direction)
In the cutting tool 101C according to the third modification, the mounting position of the strain sensor 20B in the circumferential direction is the same as the mounting position of the strain sensor 20B in the circumferential direction in the cutting tool 101 according to the first embodiment. For example, the strain sensor 20B is mounted in the region S2Bb, which is the middle region of the upper surface S2, which is the surface closest to the reference point 1K4 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20A in the circumferential direction)
In the cutting tool 101C according to the modification 3, the mounting position of the strain sensor 20A in the circumferential direction is the same as the mounting position of the strain sensor 20A in the circumferential direction in the cutting tool 101B according to the modification 2. For example, the strain sensor 20A is mounted in the region S3Ab, which is the middle region of the side surface S3, which is adjacent to the top surface S2 and is the second closest surface to the reference point 1K4 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20C in the circumferential direction)
In the cutting tool 101C according to the modification 3, the mounting position of the strain sensor 20C in the circumferential direction is the same as the mounting position of the strain sensor 20C in the circumferential direction in the cutting tool 101B according to the modification 2. For example, the strain sensor 20C is mounted on the region S3Ca on the side surface S3, which is the surface second closest to the reference point 1K4 of the four surfaces of the shank 10.

[Modification 4]
FIG. 23 is a diagram showing an example of the configuration of the cutting tool according to the modified example 4 of the first embodiment of the present disclosure. The chip 1 according to the modification 4 has a reference point 1K5 which is a reference point 1K. It is assumed that the position of the reference point 1K5 in the XY plane is within the region of the eighth quadrant Q8 shown in FIG. The position of the reference point 1K5 is an example of the position PK8 shown in FIG. With reference to FIG. 23, the cutting tool 101D includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

20A and 20C are mounted on the side surface S4 of the shank 10. Further, for example, the strain sensor 20B is mounted on the bottom surface S1 of the shank 10.

(Mounting position of strain sensor 20A in the axial direction)
The relationship between the distance dxa, the distance dya, maxdxya, mindxya, and the sensor distance Da is the same as in the first embodiment described above. Therefore, for example, the sensor distance Da satisfies the above equation (9). Further, for example, the sensor distance Da satisfies the above equation (10).

(Mounting position of strain sensor 20B in the axial direction)
The relationship between the distance dxb, the distance dyb, maxdxyb, mindxyb, and the sensor Db is the same as in the first embodiment described above. Therefore, for example, the sensor distance Db satisfies the above equation (11).

(Mounting position of strain sensor 20A in the circumferential direction)
In the cutting tool 101D according to the modification 4, the mounting position of the strain sensor 20A in the circumferential direction is the same as the mounting position of the strain sensor 20A in the circumferential direction in the cutting tool 101 according to the first embodiment. For example, the strain sensor 20A is mounted in the region S4Ab, which is the middle region on the side surface S4, which is the surface closest to the reference point 1K5 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20B in the circumferential direction)
Preferably, the strain sensor 20B is mounted on the bottom surface S1 which is adjacent to the side surface S4 and is the second closest surface to the reference point 1K5 among the four surfaces of the shank 10. In this case, when the strain sensor 20B regards FIG. 10 as a cross-sectional view (a cross-sectional view taken along the line BB-BB in FIG. 23) at the mounting position of the strain sensor 20B of the cutting tool 101D according to the modification 4, when the strain sensor 20B is regarded as a cross-sectional view. It is mounted in the area S1Bb shown in FIG. The strain sensor 20B may be mounted in the region S2Bb, the region S3Bb, and the region S4Bb shown in FIG.

More preferably, the strain sensor 20B is in the case where FIG. 11 is regarded as a cross-sectional view (cross-sectional view taken along the line BB-BB in FIG. 23) at the mounting position of the strain sensor 20B of the cutting tool 101D according to the modified example 4. , It is mounted on the region S1Bf on the bottom surface S1 shown in FIG. The strain sensor 20B may be mounted in the region S2Bf, the region S3Bf, and the region S4Bf shown in FIG.

(Mounting position of strain sensor 20C in the circumferential direction)
Similar to the above, the strain sensor 20C is the region closest to the reference point 1K5 on the surface closest to the reference point 1K5 among the four surfaces of the shank 10, and is closest to the reference point 1K5 on the surface second closest to the reference point 1K5. Mounted in at least one of four regions: a near region, a region farthest from the reference point 1K5 on the facing surface of the closest surface, and a region farthest from the reference point 1K5 on the facing surface of the second closest surface. Will be done. More specifically, when the strain sensor 20C regards FIG. 12 as a cross-sectional view (CC-CC line cross-sectional view in FIG. 23) at the mounting position of the strain sensor 20C of the cutting tool 101D according to the modification 4. In, at least one of the regions S3Ca, S1Ca, S2Cc, and S4Cc shown in FIG. 12, for example, the region S4Cc. Further, the strain sensor 20C is shown in the case where FIG. 13 is regarded as a cross-sectional view (CC-CC line cross-sectional view in FIG. 23) at the mounting position of the strain sensor 20C of the cutting tool 101D according to the modified example 4. It is mounted in at least one of the regions S3Cd, S1Cd, S2Ch, and S4Ch shown in 13, for example, the region S4Ch.

[Modification 5]
FIG. 24 is a diagram showing an example of the configuration of the cutting tool according to the modification 5 of the first embodiment of the present disclosure. The chip 1 according to the modification 5 has a reference point 1K6 which is a reference point 1K. It is assumed that the position of the reference point 1K6 in the XY plane is within the region of the seventh quadrant Q7 shown in FIG. The position of the reference point 1K6 is an example of the position PK7 shown in FIG. With reference to FIG. 24, the cutting tool 101E includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

(Mounting position of strain sensor 20B in the axial direction)
The relationship between the distance dxb, the distance dyb, maxdxyb, mindxyb, and the sensor distance Db is the same as that of the above-mentioned modification 1. Therefore, for example, the sensor distance Db satisfies the above equation (12). Further, for example, the sensor distance Db satisfies the above equation (11).

(Mounting position of strain sensor 20A in the axial direction)
The relationship between the distance dxa, the distance dya, maxdxya, mindxya, and the sensor distance Da is the same as that of the above-mentioned modification 1. Therefore, for example, the sensor distance Da satisfies the above equation (10).

(Mounting position of strain sensor 20B in the circumferential direction)
In the cutting tool 101E according to the modification 5, the mounting position of the strain sensor 20B in the circumferential direction is the same as the mounting position of the strain sensor 20B in the circumferential direction in the cutting tool 101D according to the modification 4. For example, the strain sensor 20B is mounted in the region S1Bb, which is the middle region of the bottom surface S1, which is the surface closest to the reference point 1K6 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20A in the circumferential direction)
In the cutting tool 101E according to the modification 5, the mounting position of the strain sensor 20A in the circumferential direction is the same as the mounting position of the strain sensor 20A in the circumferential direction in the cutting tool 101 according to the first embodiment. For example, the strain sensor 20A is mounted in a region S4Ab which is a middle region on the side surface S4 which is adjacent to the bottom surface S1 and is the second closest surface to the reference point 1K6 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20C in the circumferential direction)
In the cutting tool 101E according to the modification 5, the mounting position of the strain sensor 20C in the circumferential direction is the same as the mounting position of the strain sensor 20C in the circumferential direction in the cutting tool 101D according to the modification 4. For example, the strain sensor 20C is mounted in the region S4Cc on the side surface S4, which is the surface second closest to the reference point 1K6 of the four surfaces of the shank 10.

[Modification 6]
FIG. 25 is a diagram showing an example of the configuration of the cutting tool according to the modification 6 of the first embodiment of the present disclosure. In FIG. 25, the

strain sensors

20A and 20C mounted on the side surface S3 of the shank 10 are shown by broken lines. The chip 1 according to the modification 6 has a reference point 1K7 which is a reference point 1K. It is assumed that the position of the reference point 1K7 in the XY plane is within the region of the fifth quadrant Q5 shown in FIG. The position of the reference point 1K7 is an example of the position PK5 shown in FIG. With reference to FIG. 25, the cutting tool 101F includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

20A and 20C are mounted on the side surface S3 of the shank 10. Further, for example, the strain sensor 20B is mounted on the bottom surface S1 of the shank 10.

(Mounting position of strain sensor 20B in the axial direction)
The relationship between the distance dxb, the distance dyb, the maxdxyb, the mindxyb, and the sensor distance Db is the same as in the first embodiment described above. Therefore, for example, the sensor distance Db satisfies the above equation (11).

(Mounting position of strain sensor 20A in the circumferential direction)
In the cutting tool 101F according to the modification 6, the mounting position of the strain sensor 20A in the circumferential direction is the same as the mounting position of the strain sensor 20A in the circumferential direction in the cutting tool 101B according to the modification 2. For example, the strain sensor 20A is mounted in the region S3Ab, which is the middle region on the side surface S3, which is the surface closest to the reference point 1K7 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20B in the circumferential direction)
In the cutting tool 101F according to the modification 6, the mounting position of the strain sensor 20B in the circumferential direction is the same as the mounting position of the strain sensor 20B in the circumferential direction in the cutting tool 101D according to the modification 4. For example, the strain sensor 20B is mounted in a region S1Bb which is a middle region on the bottom surface S1 which is adjacent to the side surface S3 and is the second closest surface to the reference point 1K7 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20C in the circumferential direction)
Similar to the above, the strain sensor 20C is the region closest to the reference point 1K7 on the surface closest to the reference point 1K7 among the four surfaces of the shank 10, and the reference point 1K7 on the surface second closest to the reference point 1K7. Mounted in at least one of four regions: a near region, a region farthest from the reference point 1K7 on the facing surface of the closest surface, and a region farthest from the reference point 1K7 on the facing surface of the second closest surface. Will be done. More specifically, when the strain sensor 20C regards FIG. 12 as a cross-sectional view (a cross-sectional view taken along the line DD-DD in FIG. 25) at the mounting position of the strain sensor 20C of the cutting tool 101F according to the modification 6. In, at least one of the regions S3Cc, S1Cc, S2Ca, and S4Ca shown in FIG. 12, for example, the region S3Cc. Further, the strain sensor 20C is a diagram when FIG. 13 is regarded as a cross-sectional view (a cross-sectional view taken along the line DD-DD in FIG. 25) at the mounting position of the strain sensor 20C of the cutting tool 101F according to the modification 6. It is mounted in at least one of the regions S3Ch, S1Ch, S2Cd, and S4Cd shown in 13, for example, the region S3Ch.

[Modification 7]
FIG. 26 is a diagram showing an example of the configuration of the cutting tool according to the modification 7 of the first embodiment of the present disclosure. In FIG. 26, the

strain sensors

20A and 20C mounted on the side surface S3 of the shank 10 are shown by broken lines. The chip 1 according to the modification 7 has a reference point 1K8 which is a reference point 1K. It is assumed that the position of the reference point 1K8 in the XY plane is within the region of the sixth quadrant Q6 shown in FIG. The position of the reference point 1K8 is an example of the position PK6 shown in FIG. With reference to FIG. 26, the cutting tool 101G includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

(Mounting position of strain sensor 20B in the circumferential direction)
In the cutting tool 101G according to the modification 7, the mounting position of the strain sensor 20B in the circumferential direction is the same as the mounting position of the strain sensor 20B in the circumferential direction in the cutting tool 101D according to the modification 4. For example, the strain sensor 20B is mounted in the region S1Bb, which is the middle region of the bottom surface S1, which is the surface closest to the reference point 1K8 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20A in the circumferential direction)
In the cutting tool 101G according to the modification 7, the mounting position of the strain sensor 20A in the circumferential direction is the same as the mounting position of the strain sensor 20A in the circumferential direction in the cutting tool 101B according to the modification 2. For example, the strain sensor 20A is mounted in a region S3Ab which is a middle region on the side surface S3 which is adjacent to the bottom surface S1 and is the second closest surface to the reference point 1K8 among the four surfaces of the shank 10.

(Mounting position of strain sensor 20C in the circumferential direction)
In the cutting tool 101G according to the modification 7, the mounting position of the strain sensor 20C in the circumferential direction is the same as the mounting position of the strain sensor 20C in the circumferential direction in the cutting tool 101F according to the modification 6. For example, the strain sensor 20C is mounted in the region S3Cc on the side surface S3, which is the surface second closest to the reference point 1K8 of the four surfaces of the shank 10.

[Modification 8]
FIG. 27 is a diagram showing an example of the configuration of the cutting tool according to the modification 8 of the first embodiment of the present disclosure. The chip 1 according to the modification 8 has a reference point 1K9 which is a reference point 1K. It is assumed that the position of the reference point 1K9 in the XY plane is on the boundary line between the second quadrant Q2 and the third quadrant Q3 shown in FIG. The position of the reference point 1K9 is an example of the position PK9 shown in FIG. With reference to FIG. 27, the cutting tool 101H includes

strain sensors

20A, 20B, 20C. For example, the strain sensor 20A is mounted on the side surface S4 of the shank 10. Further, for example, the

strain sensors

20B and 20C are mounted on the upper surface S2 of the shank 10.

FIGS. 28 to 30 are cross-sectional views showing the configuration of the cutting tool according to the modified example 8 of the first embodiment of the present disclosure. FIG. 28 is a cross-sectional view taken along the line XXVIII-XXVIII in FIG. 27. In FIG. 28, the position of the reference point 1K9 when the reference point 1K9 is translated along the Z direction to the cross section seen by the line arrow of XXVIII-XXVIII is indicated by a black circle. In FIG. 28, as another example of the modification 8, when the chip 1 has the reference point 1Ka instead of the reference point 1K9, the reference point 1Ka is translated along the Z direction to the cross section along the line XXVIII-XXVIII. The position of the reference point 1Ka at the time is indicated by a black circle. The position of the reference point 1Ka on the XY plane is a position shifted from the position of the reference point 1K9 toward the side surface S4 along the X direction, and is a position in the second quadrant Q2 shown in FIG.

FIG. 29 is a cross-sectional view taken along the line XXIX-XXIX in FIG. 27. In FIG. 29, the position of the reference point 1K9 when the reference point 1K9 is translated along the Z direction to the cross section of the XXIX-XXIX line arrow is indicated by a black circle. Further, in FIG. 29, similarly to FIG. 28, the position of the reference point 1Ka when the reference point 1Ka is translated along the Z direction to the cross section of the XXIX-XXIX line arrow is indicated by a black circle.

FIG. 30 is a cross-sectional view taken along the line XXX-XXX in FIG. 27. In FIG. 30, the position of the reference point 1K9 when the reference point 1K9 is translated along the Z direction to the cross section seen by the XXX-XXX line is indicated by a black circle. Further, in FIG. 30, similarly to FIG. 28, the position of the reference point 1Ka when the reference point 1Ka is translated along the Z direction to the cross section seen by the XXX-XXX line is indicated by a black circle.

With reference to FIGS. 28 to 30, the surface closest to the reference point 1K9 among the four surfaces of the shank 10 is the upper surface S2. Further, in the examples shown in FIGS. 28 to 30, the upper surface S2 is an example of the first surface, the side surface S4 is an example of the second surface, the bottom surface S1 is an example of the third surface, and the side surface S3 is an example. , Is an example of the fourth surface. Here, the shank height of the shank 10 in the cross section seen by the XXX-XXX line arrow is defined as Wc. For example, Wc is equal to the shank height W described above. Further, the distance between the center of the shank 10 and the reference point at the mounting position of the strain sensor 20C in the X direction is defined as the distance dxc. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20C in the Y direction and the reference point is defined as the distance dyc.

<When the chip has a reference point 1K9>
With reference to FIGS. 28 to 30, the mounting positions of the

strain sensors

20B, 20A, and 20C are the same as the mounting positions described in the modified example 1 or the modified example 3. This is the position of the reference point 1K9 when the reference point 1K9 is translated to the XXVIII-XXVIII line arrow cross section along the Z direction, and the reference point 1K9 is translated to the XXIX-XXIX line arrow cross section along the Z direction. The position of the reference point 1K9 at the time and the position of the reference point 1K9 when translated in parallel to the cross section of the XXX-XXX line along the Z direction are on the boundary line between the second quadrant Q2 and the third quadrant Q3. Because.

<When the chip has a reference point of 1 Ka>
The mounting positions of the

strain sensors

20B, 20A, and 20C are the same as the mounting positions described in the first modification. This is the position of the reference point 1Ka when the reference point 1Ka is translated to the XXVIII-XXVIII line arrow cross section along the Z direction, and the reference point 1Ka is translated to the XXIX-XXIX line arrow cross section along the Z direction. This is because the position of the reference point 1Ka at the time and the position of the reference point 1Ka when translated into the cross section seen by the XXXX-XXX line along the Z direction are within the second quadrant Q2.

However, if the position of the reference point 1Ka satisfies a predetermined condition, the mounting position of the

strain sensors

20A, 20B, 20C may be the same as when the chip 1 has the reference point 1K9.

That is, the mounting position of the strain sensor 20B may be the same as when the chip 1 has the reference point 1K9 when the position of the reference point 1Ka satisfies a predetermined condition. The predetermined condition is that the following equation (13) is satisfied.
10dxb ≤ dib + W / 6 ... (13)
More specifically, the straight lines L1ba and L1bb shown in FIG. 28 are straight lines extending from the center of the shank 10 toward the bottom surface S1 along the Y direction from W / 6, that is, a point 17K separated from Wb / 6, and have the following equation. It is a straight line satisfying (14).
10dxb = dyb + W / 6 ... (14)
When the position of the reference point 1Ka on the XY plane is located between the straight line L1ba and the straight line L1bb, the mounting position of the strain sensor 20B may be the same as the mounting position described in the modified example 1 or the modified example 3. good.

Further, the mounting position of the strain sensor 20A may be the same as when the chip 1 has the reference point 1K9 when the position of the reference point 1Ka satisfies a predetermined condition. The predetermined condition is that the following equation (15) is satisfied.
10dxa ≤ dya + W / 6 ... (15)
More specifically, the straight lines L1aa and L1ab shown in FIG. 29 are straight lines extending from the center of the shank 10 toward the bottom surface S1 along the Y direction from W / 6, that is, a point 17K separated from Wa / 6, and have the following formula. It is a straight line satisfying (16).
10dxa = dya + W / 6 ... (16)
When the position of the reference point 1Ka on the XY plane is located between the straight line L1aa and the straight line L1ab, the mounting position of the strain sensor 20A may be the same as the mounting position described in the modified example 1 or the modified example 3. good.

Further, the strain sensor 20C is mounted at an arbitrary position on the upper surface S2 or the bottom surface S1 of the four surfaces of the shank 10 when the position of the reference point 1Ka satisfies a predetermined condition. The predetermined condition is that the following equation (17) is satisfied.
10dxc≤dyc + W / 6 ... (17)
More specifically, the straight lines L1ca and L1cc shown in FIG. 30 are straight lines extending from the center of the shank 10 toward the bottom surface S1 along the Y direction from W / 6, that is, a point 17K separated from Wc / 6, and have the following formula. It is a straight line satisfying (18).
10dxc = dyc + W / 6 ... (18)
When the position of the reference point 1Ka on the XY plane is located between the straight line L1ca and the straight line L1bc, the strain sensor 20C is mounted at an arbitrary position on the upper surface S2 or the bottom surface S1.

In this way, the strain sensor 20C, which is a vertical strain sensor, faces the surface closest to the reference point 1Ka in the shank 10 of the cutting tool 101H whose distance dx is small with respect to the distance dy, such as a sword bite, or faces the surface. Due to the configuration mounted on the surface, the vertical strain generated by the load in the Z direction can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

[Modification 9]
FIG. 31 is a diagram showing an example of the configuration of the cutting tool according to the modified example 9 of the first embodiment of the present disclosure. The chip 1 according to the modification 9 has a reference point 1K10 which is a reference point 1K. It is assumed that the position of the reference point 1K10 in the XY plane is on the boundary line between the 7th quadrant Q7 and the 6th quadrant Q6 shown in FIG. The position of the reference point 1K10 in the modification 9 is an example of the position PK10 shown in FIG. With reference to FIG. 31, the cutting tool 101I includes

strain sensors

20B and 20C are mounted on the bottom surface S1 of the shank 10.

FIG. 32 is a cross-sectional view showing the configuration of the cutting tool according to the modified example 9 of the first embodiment of the present disclosure. FIG. 32 is a cross-sectional view taken along the line XXXII-XXXII in FIG. 31. In FIG. 32, the position of the reference point 1K10 when the reference point 1K10 is translated along the Z direction to the cross section seen by the line arrow of XXXII-XXXII is shown by a black circle. In FIG. 32, as another example of the modification 9, when the chip 1 has the reference point 1Ka instead of the reference point 1K10, the reference point 1Ka is translated along the Z direction to the cross section seen by the line arrow of XXXII-XXXII. The position of the reference point 1Ka at the time is indicated by a black circle. The position of the reference point 1Ka on the XY plane is a position shifted from the position of the reference point 1K10 toward the side surface S4 along the X direction, and is a position in the seventh quadrant Q7 shown in FIG.

With reference to FIG. 32, the surface closest to the reference point 1K10 among the four surfaces of the shank 10 is the bottom surface S1. Further, in the example shown in FIG. 32, the bottom surface S1 is an example of the first surface, the side surface S4 is an example of the second surface, the top surface S2 is an example of the third surface, and the side surface S3 is the first surface. 4 This is an example of the surface.

<When the chip has a reference point 1K10>
The mounting position of the strain sensor 20B is the same as the mounting position described in the modified example 5 or the modified example 7. This is because the position of the reference point 1K10 when the reference point 1K10 is translated along the Z direction to the cross section seen by the XXXII-XXXII line is on the boundary line between the 6th quadrant Q6 and the 7th quadrant Q7. be. The same applies to the mounting positions of the

strain sensors

20A and 20C.

<When the chip has a reference point of 1 Ka>
The mounting position of the strain sensor 20B is the same as the mounting position described in the modified example 5. This is because the position of the reference point 1Ka when the reference point 1Ka is translated along the Z direction to the cross section seen by the line arrow of XXXII-XXXII is in the seventh quadrant Q7. The same applies to the mounting positions of the

strain sensors

20A and 20C.

However, the mounting positions of the

strain sensors

20A, 20B, and 20C may be the same as when the chip 1 has the reference point 1K10 when the above equations (13), (15), and (17) are satisfied. More specifically, the mounting positions of the

strain sensors

20A and 20B may be the same as the mounting positions described in the modified example 5 or the modified example 7 when the above equations (13) and (15) are satisfied. Further, the strain sensor 20C is mounted at an arbitrary position on the bottom surface S1 or the top surface S2 when the above equation (17) is satisfied.

In this way, the strain sensor 20C, which is a vertical strain sensor, faces the surface closest to the reference point 1Ka in the shank 10 of the cutting tool 101I whose distance dx is small with respect to the distance dy, such as a sword bite, or faces the surface. Due to the configuration mounted on the surface, the vertical strain generated by the load in the Z direction can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

[Modification 10]
FIG. 33 is a diagram showing an example of the configuration of the cutting tool according to the modification 10 of the first embodiment of the present disclosure. The chip 1 according to the modification 10 has a reference point 1K11 which is a reference point 1K. It is assumed that the position of the reference point 1K11 in the XY plane is on the boundary line between the first quadrant Q1 and the eighth quadrant Q8 shown in FIG. The position of the reference point 1K11 in the modification 8 is an example of the position PK11 shown in FIG. With reference to FIG. 33, the cutting tool 101J includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

FIG. 34 is a cross-sectional view showing the configuration of the cutting tool according to the modified example 10 of the first embodiment of the present disclosure. FIG. 34 is a cross-sectional view taken along the line XXXIV-XXXIV in FIG. 33. In FIG. 34, the position of the reference point 1K11 when the reference point 1K11 is translated along the Z direction to the cross section of the XXXIV-XXXIV line is indicated by a black circle. In FIG. 34, as another example of the modification 10, when the chip 1 has the reference point 1Ka instead of the reference point 1K11, the reference point 1Ka is translated along the Z direction to the cross section of the XXXIV-XXXIV line. The position of the reference point 1Ka at the time is indicated by a black circle. The position of the reference point 1Ka on the XY plane is a position shifted from the position of the reference point 1K11 toward the upper surface S2 along the Y direction, and is a position in the first quadrant Q1 shown in FIG.

With reference to FIG. 34, of the four surfaces of the shank 10, the surface closest to the reference point 1K11 is the side surface S4. Further, in the example shown in FIG. 34, the side surface S4 is an example of the first surface, the upper surface S2 is an example of the second surface, the side surface S3 is an example of the third surface, and the bottom surface S1 is the first surface. 4 This is an example of the surface.

<When the chip has a reference point 1K11>
The mounting position of the strain sensor 20A is the same as the mounting position described in the first embodiment or the fourth modification. This is because the position of the reference point 1K11 when the reference point 1K11 is translated along the Z direction to the cross section of the XXXIV-XXXIV line is on the boundary line between the first quadrant Q1 and the eighth quadrant Q8. be. The same applies to the mounting positions of the

strain sensors

20B and 20C.

<When the chip has a reference point of 1 Ka>
The mounting position of the strain sensor 20A is the same as the mounting position described in the first embodiment. This is because the position of the reference point 1Ka when the reference point 1Ka is translated along the Z direction to the cross section seen by the XXXIV-XXXIV line is within the first quadrant Q1. The same applies to the mounting positions of the

strain sensors

20B and 20C.

strain sensors

20A, 20B, 20C may be the same as when the chip 1 has the reference point 1K11.

That is, the mounting position of the strain sensor 20A may be the same as when the chip 1 has the reference point 1K11 when the position of the reference point 1Ka satisfies a predetermined condition. The predetermined condition is that the following equation (19) is satisfied.
10dya≤dxa + W / 6 ... (19)
More specifically, the straight lines L3aa and L3ab shown in FIG. 34 are straight lines extending from the center of the shank 10 toward the side surface S3 along the X direction from W / 6, that is, a point 17K separated from Wa / 6, and the following formula is used. It is a straight line satisfying (20).
10dya = dxa + W / 6 ... (20)
When the position of the reference point 1Ka on the XY plane is located between the straight line L3aa and the straight line L3ab, the mounting position of the strain sensor 20A is the same as the mounting position described in the first embodiment or the modified example 4. There may be.

Further, the mounting position of the strain sensor 20B may be the same as when the chip 1 has the reference point 1K11 when the position of the reference point 1Ka satisfies a predetermined condition. The predetermined condition is that the following equation (21) is satisfied.
10dyb ≤ dxb + W / 6 ... (21)
More specifically, the position of the reference point 1Ka on the XY plane is a straight line extending from the center of the shank 10 toward the side surface S3 along the X direction from W / 6, that is, a point 17K separated by Wb / 6, and the following equation. When it is located between two straight lines satisfying (22), the mounting position of the strain sensor 20B may be the same as the mounting position described in the first embodiment or the modified example 4.
10dyb = dxb + W / 6 ... (22)

Further, the strain sensor 20C is mounted at an arbitrary position on the side surface S4 or the side surface S3 of the four surfaces of the shank 10 when the position of the reference point 1Ka satisfies a predetermined condition. The predetermined condition is that the following equation (23) is satisfied.
10dyc≤dxc + W / 6 ... (23)
More specifically, the position of the reference point 1Ka on the XY plane is a straight line extending from the center of the shank 10 toward the side surface S3 along the X direction from W / 6, that is, a point 17K separated by Wc / 6, and the following equation. When located between two straight lines satisfying (24), the strain sensor 20C is mounted at an arbitrary position on the side surface S4 or the side surface S3.
10dyc = dxc + W / 6 ... (24)

As described above, the strain sensor 20C, which is a vertical strain sensor, is mounted on the surface closest to the reference point 1Ka or the surface facing the reference point 1Ka in the shank 10 of the cutting tool 101J having a distance dy smaller than the distance dx. Therefore, the vertical strain generated by the load in the Z direction can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

[Modification 11]
FIG. 35 is a diagram showing an example of the configuration of the cutting tool according to the modification 11 of the first embodiment of the present disclosure. The chip 1 according to the modification 11 has a reference point 1K12 which is a reference point 1K. It is assumed that the position of the reference point 1K12 in the XY plane is on the boundary line between the fourth quadrant Q4 and the fifth quadrant Q5 shown in FIG. The position of the reference point 1K12 in the modification 11 is an example of the position PK12 shown in FIG. With reference to FIG. 35, the cutting tool 101K includes

strain sensors

20A, 20B, 20C. For example, the

strain sensors

FIG. 36 is a cross-sectional view showing the configuration of the cutting tool according to the modification 11 of the first embodiment of the present disclosure. FIG. 36 is a cross-sectional view taken along the line XXXVI-XXXVI in FIG. 35. In FIG. 58, the position of the reference point 1K12 when the reference point 1K12 is translated along the Z direction to the cross section of the XXXVI-XXXVI line arrow is indicated by a black circle. In FIG. 36, as another example of the modification 11, when the chip 1 has the reference point 1Ka instead of the reference point 1K12, the reference point 1Ka is translated along the Z direction to the cross section seen by the line arrow of XXXVI-XXXVI. The position of the reference point 1Ka at the time is indicated by a black circle. The position of the reference point 1Ka on the XY plane is a position shifted from the position of the reference point 1K12 toward the upper surface S2 along the Y direction, and is a position in the fourth quadrant Q4 shown in FIG.

With reference to FIG. 36, of the four surfaces of the shank 10, the surface closest to the reference point 1K12 is the side surface S3. Further, in the example shown in FIG. 36, the side surface S3 is an example of the first surface, the upper surface S2 is an example of the second surface, the side surface S4 is an example of the third surface, and the bottom surface S1 is the first surface. 4 This is an example of the surface.

<When the chip has a reference point 1K12>
The mounting position of the strain sensor 20A is the same as the mounting position described in the modified example 2 or the modified example 6. This is because the position of the reference point 1K12 when the reference point 1K12 is translated along the Z direction to the cross section of the XXXVI-XXXVI line is on the boundary line between the 4th quadrant Q4 and the 5th quadrant Q5. be. The same applies to the mounting positions of the

strain sensors

20B and 20C.

<When the chip has a reference point of 1 Ka>
The mounting position of the strain sensor 20A is the same as the mounting position described in the second modification. This is because the position of the reference point 1Ka when the reference point 1Ka is translated along the Z direction to the cross section of the XXXVI-XXXVI line arrow is within the fourth quadrant Q4. The same applies to the mounting positions of the

strain sensors

20B and 20C.

However, the mounting positions of the

strain sensors

20A, 20B, and 20C may be the same as when the chip 1 has the reference point 1K12 when the above equations (19), (21), and (23) are satisfied. More specifically, the mounting positions of the

strain sensors

20A and 20B may be the same as the mounting positions described in the modified example 2 or the modified example 6 when the above equations (19) and (21) are satisfied. Further, the strain sensor 20C is mounted at an arbitrary position on the side surface S3 or the side surface S4 when the above equation (23) is satisfied.

As described above, the strain sensor 20C, which is a vertical strain sensor, is mounted on the surface closest to the reference point 1K or the surface facing the reference point 1K in the shank 10 of the cutting tool 101Ka whose distance dy is smaller than the distance dx. Therefore, the vertical strain generated by the load in the Z direction can be measured with higher sensitivity. Therefore, the strain of the shank can be measured with higher sensitivity by using the strain sensor.

In the first embodiment and

modifications

2, 4, 6, 10, 11 described above, the strain sensor 20A is an example of the first shear strain sensor, and the strain sensor 20B is the second shear strain sensor. As an example, the strain sensor 20C is an example of a first vertical strain sensor. Further, in the above-mentioned modified examples 1, 3, 5, 7, 8 and 9, the strain sensor 20A is an example of the second shear strain sensor, and the strain sensor 20B is an example of the first shear strain sensor. , The strain sensor 20C is an example of the first vertical strain sensor.

The positions of the reference points 1K1 to 1K12 shown in FIGS. 8 to 13 are examples. In the

cutting tools

101, 101A, 101B, 101C, 101D, 101E, 101F, 101G, 101H, 101I, 101J, 101K, the

strain sensors

20A, 20B, 20C are as long as the position of the reference point 1K is within the corresponding quadrant. , It is mounted in the above-mentioned mounting position.

[Verification of mounting position of strain sensor]
The inventor of the present application simulates the stress distribution in the shank 10 when cutting resistance is applied to the cutting edge, and based on the simulation result, a strain sensor for measuring the strain generated in the shank 10 during cutting with higher sensitivity. Twenty preferred mounting positions were verified. First, the inventor of the present application calculated vertical strain and shear strain at a plurality of target positions on the surface of the shank 10 based on the simulation result of the stress distribution in the shank 10. Specifically, the inventor of the present application acquires a stress tensor at a plurality of target positions from the simulation result of the stress distribution in the shank 10, and calculates the strain tensor using the acquired stress tensor and the stress-strain conversion formula. , The calculation results of vertical strain and shear strain at each target position were taken out from the strain tensor.

(Simulation result using outer diameter bite)
FIG. 37 is a diagram showing a configuration of an outer diameter bite which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 38 is a cross-sectional view showing the configuration of an outer diameter bite which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 38 is a cross-sectional view taken along the line XXXVIII-XXXVIII in FIG. 37. In FIG. 38, the position of the reference point 1K when the reference point 1K is translated along the Z direction to the cross section seen along the line XXXVIII-XXXVIII is indicated by a black circle.

With reference to FIGS. 37 and 38, the inventor of the present application has 20 positions on the surface of the outer diameter bite 101DB having a shank height W of 25 mm, which is a distance Ds away from the reference point 1K in the Z direction. Vertical strain and shear strain at the target position Ps were calculated respectively. More specifically, the inventor of the present application has five target positions Ps on the bottom surface S1, five target position Ps on the top surface S2, five target position Ps on the side surface S3, and five target positions on the side surface S4. The vertical strain and the shear strain at the target position Ps of the above were calculated respectively. The target position Ps is the midpoint of each region when each surface of the shank 10 is equally divided into five regions. That is, for example, the distances between the five target positions Ps on the bottom surface S1 and the end portions of the bottom surface S1 are 2.5 mm, 7.5 mm, 12.5 mm, 17.5 mm, and 22.5 mm, respectively.

FIGS. 39 to 41 are diagrams showing calculation results of vertical strain in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 39 shows the vertical strain at each target position Ps at a distance Ds of 20 mm. FIG. 40 shows the vertical strain at each target position Ps where the distance Ds is 40 mm. FIG. 41 shows the vertical strain at each target position Ps at a distance Ds of 60 mm. In FIGS. 39 to 41, the round plot shows the vertical strain snx generated at the target position Ps when the load Fx is applied to the outer diameter bite 101DB, and the triangular plot shows the load Fy applied to the outer diameter bite 101DB. The vertical strain sny generated at the target position Ps is shown, and the square plot shows the vertical strain snz generated at the target position Ps when the load Fz is applied to the outer diameter bite 101DB. Further, in FIGS. 39 to 41, the vertical axis shows the vertical strain [με], and the horizontal axis is the distance of the target position Ps along the circumferential direction starting from the boundary position between the upper surface S2 and the side surface S4. [Mm] is shown.

42 to 44 are diagrams showing the calculation results of shear strain in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 42 shows the shear strain at each target position Ps at a distance Ds of 20 mm. FIG. 43 shows the shear strain at each target position Ps at a distance Ds of 40 mm. FIG. 44 shows the shear strain at each target position Ps at a distance Ds of 60 mm. In FIGS. 42 to 44, the round plot shows the shear strain ssx generated at the target position Ps when the load Fx is applied to the outer diameter bite 101DB, and the triangular plot shows the shear strain ssx generated at the target position Ps, and the triangular plot shows the load Fy applied to the outer diameter bite 101DB. The shear strain ssy generated at the target position Ps is shown, and the square plot shows the shear strain ssz generated at the target position Ps when the load Fz is applied to the outer diameter bite 101DB. Further, in FIGS. 42 to 44, the vertical axis shows the shear strain [με], and the horizontal axis is the distance of the target position Ps along the circumferential direction starting from the boundary position between the upper surface S2 and the side surface S4. [Mm] is shown.

With reference to FIGS. 39 to 41, the absolute value of the vertical strain snx is the maximum value on the side surface S3 and the side surface S4. Further, the absolute value of the vertical strain sny becomes the maximum value on the bottom surface S1 and the top surface S2. Further, the absolute value of the vertical strain sny becomes a maximum value in the vicinity of the boundary portion between the upper surface S2 and the side surface S4 and in the vicinity of the boundary portion between the bottom surface S1 and the side surface S3, and in the vicinity of the boundary portion between the upper surface S2 and the side surface S4. It becomes the maximum value. Further, the absolute values of the vertical strain snx and sny increase as the distance Ds increases, while the absolute values of the vertical strain snz are constant regardless of the distance Ds.

With reference to FIGS. 42 to 44, the shear strain ssz at each target position Ps is always zero regardless of the distance Ds. Further, the absolute values of the shear strains ssx and ssy at each target position Ps are constant regardless of the distance Ds. Further, the absolute value of the shear strain ssx becomes a maximum value in the central portion in the circumferential direction of the four surfaces and a maximum value in the central portion in the circumferential direction of the upper surface S2. Further, the absolute value of the shear strain ssy becomes a maximum value in the central portion in the circumferential direction of the four surfaces, and becomes a maximum value in the central portion in the circumferential direction of the side surface S4.

(Simulation result using sword bite)
FIG. 45 is a diagram showing a configuration of a sword bite which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 46 is a cross-sectional view showing the configuration of a sword bite, which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 46 is a cross-sectional view taken along the line XLVI-XLVI in FIG. 45. In FIG. 46, the position of the reference point 1K when the reference point 1K is translated along the Z direction to the cross section of the XLVI-XLVI line is indicated by a black circle.

With reference to FIG. 46, in the sword bite 101SB, since the reference point 1K is directly above the axis 17, the distance dx between the center of the shank 10 and the reference point 1K in the X direction is zero. Further, referring to FIGS. 38 and 46, in the outer diameter bite 101DB and the sword bite 101SB, the distance dy between the center of the shank 10 and the reference point 1K in the Y direction is equal to each other.

With reference to FIGS. 45 and 46, the inventor of the present application presents 20 objects at positions on the surface of the sword bite 101SB having a shank height W of 25 mm, at a distance Ds from the reference point 1K in the Z direction. Vertical strain and shear strain at position Ps were calculated respectively. More specifically, the inventor of the present application has five target positions Ps on the bottom surface S1, five target position Ps on the top surface S2, five target position Ps on the side surface S3, and five target positions on the side surface S4. The vertical strain and the shear strain at the target position Ps of the above were calculated respectively.

FIG. 47 is a diagram showing a calculation result of vertical strain in a sword tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 47 shows the vertical strain at each target position Ps at a distance Ds of 40 mm. In FIG. 47, the round plot shows the vertical strain snx that occurs at the target position Ps as the load Fx is applied to the sword bite 101SB, and the triangular plot shows the target as the load Fy is applied to the sword bite 101SB. The vertical strain sny generated at the position Ps is shown, and the square plot shows the vertical strain snz generated at the target position Ps as the load Fz is applied to the sword bite 101SB. Further, in FIG. 47, the vertical axis represents the vertical strain [με], and the horizontal axis is the distance [mm] of the target positions Ps along the circumferential direction starting from the boundary position between the upper surface S2 and the side surface S4. Is shown.

FIG. 48 is a diagram showing a calculation result of shear strain in a sword tool which is an example of a cutting tool according to the first embodiment of the present disclosure. FIG. 48 shows the shear strain at each target position Ps at a distance Ds of 40 mm. In FIG. 48, the round plot shows the shear strain ssx generated at the target position Ps when the load Fx is applied to the sword bite 101SB, and the triangular plot shows the target when the load Fy is applied to the sword bite 101SB. The shear strain ssy generated at the position Ps is shown, and the square plot shows the shear strain ssz generated at the target position Ps as the load Fz is applied to the sword bite 101SB. Further, in FIG. 48, the vertical axis represents the shear strain [με], and the horizontal axis is the distance [mm] of the target positions Ps along the circumferential direction starting from the boundary position between the upper surface S2 and the side surface S4. Is shown.

With reference to FIG. 47, the absolute value of the vertical strain snx is the maximum value on the side surface S3 and the side surface S4. Further, the absolute value of the vertical strain sny becomes the maximum value on the bottom surface S1 and the top surface S2. Further, the absolute value of the vertical strain snz becomes a maximum value on the bottom surface S1 and the top surface S2, and becomes a maximum value on the top surface S2.

With reference to FIG. 48, the shear strain ssz at each target position Ps is zero. Further, the absolute value of the shear strain ssx becomes a maximum value in the central portion in the circumferential direction of the upper surface S2 and the side surfaces S3 and S4, and becomes a maximum value in the central portion in the circumferential direction of the upper surface S2. Further, the absolute value of the shear strain ssy becomes the maximum value in the central portion in the circumferential direction of the side surfaces S3 and S4.

(Comparison of vertical strain and shear strain)
FIG. 49 is a diagram showing the relationship between the distance from the reference point and the vertical strain and the shear strain in the outer diameter tool which is an example of the cutting tool according to the first embodiment of the present disclosure. In FIG. 49, the round plot shows the maximum vertical strain Msnx, which is the maximum absolute value of the vertical strain snx generated at 20 target positions Ps due to the load Fx being applied to the outer diameter bite 101DB, and is triangular. The plot shows the maximum shear strain Mssx, which is the maximum absolute value of the shear strain ssx generated at 20 target positions Ps when the load Fx is applied to the outer diameter bite 101DB. Further, in FIG. 49, the horizontal axis indicates the distance Ds [mm], and the vertical axis indicates the absolute value [με] of the strain.

With reference to FIG. 49, the maximum vertical strain Msnx is proportional to the distance Ds, while the maximum shear strain Mssx is constant regardless of the distance Ds. Hereinafter, the distance Ds when the maximum vertical strain Msnx and the maximum shear strain Mssx become equal is also referred to as an equal strain distance Leqx. At a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is larger than the equal strain distance Leqx, the maximum vertical strain Msnx is larger than the maximum shear strain Mssx. Therefore, when the strain sensor 20 is mounted at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is larger than the equal strain distance Leqx, the vertical strain sensor is mounted. Compared with the case where a shear strain sensor is mounted, the strain generated by the application of the load Fx can be measured with higher sensitivity. On the other hand, at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is smaller than the equal strain distance Leqx, the maximum shear strain Mssx is larger than the maximum vertical strain Msnx. Therefore, when the strain sensor 20 is mounted at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is smaller than the equal strain distance Leqx, the shear strain sensor is mounted. Compared with the case where the vertical strain sensor is mounted, the strain generated by the application of the load Fx can be measured with higher sensitivity.

FIG. 50 is a diagram showing the relationship between the distance from the reference point and the vertical strain and the shear strain in the outer diameter tool which is an example of the cutting tool according to the first embodiment of the present disclosure. In FIG. 50, the round plot shows the maximum vertical strain Msny, which is the maximum value of the absolute value of the vertical strain sny generated at the target positions Ps at 20 points due to the load Fy being applied to the outer diameter bite 101DB, and is triangular. The plot shows the maximum shear strain Mssy, which is the maximum value of the absolute value of the shear strain ssy generated at 20 target positions Ps when the load Fy is applied to the outer diameter bite 101DB. Further, in FIG. 50, the horizontal axis represents the distance Ds [mm], and the vertical axis represents the absolute value [με] of the strain.

With reference to FIG. 50, the maximum vertical strain Msny is proportional to the distance Ds, while the maximum shear strain Mssy is constant regardless of the distance Ds. Hereinafter, the distance Ds when the maximum vertical strain Msny and the maximum shear strain Mssy become equal is also referred to as an equal strain distance Leqy. At a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is larger than the equal strain distance Leqy, the maximum vertical strain Msny is larger than the maximum shear strain Mssy. Therefore, when the strain sensor 20 is mounted at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is larger than the equal strain distance Leqy, the vertical strain sensor is mounted. Compared with the case where the shear strain sensor is mounted, the strain generated by the application of the load Fy can be measured with higher sensitivity. On the other hand, at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is smaller than the equal strain distance Leqy, the maximum shear strain Mssy is larger than the maximum vertical strain Msnx. Therefore, when the strain sensor 20 is mounted at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is smaller than the equal strain distance Leqy, the shear strain sensor is mounted. Compared with the case where the vertical strain sensor is mounted, the strain generated by the application of the load Fy can be measured with higher sensitivity.

(Verification of selection criteria for strain sensor)
Similarly, the inventors of the present application calculated the equal strain distances Leqx and Leqy using the simulation results for the sword bite 101SB having a shank height W of 25 mm. Further, the inventors of the present application have an outer diameter bite 101DB and a sword bite 101SB having a shank height W of 8 mm, an outer diameter bite 101DB and a sword bite 101SB having a shank height W of 16 mm, and a shank height W of 40 mm. Using the simulation results of the stress distribution for the outer diameter bite 101DB and the sword bite 101SB, and the outer diameter bite 101DB and the sword bite 101SB having a shank height W of 50 mm, the equal strain distances Leqx and Leqy were similarly calculated.

Here, the outer diameter bite 101DB having a shank height W of 8 mm has a distance dx of 6 mm and a distance dy of 4 mm. The outer diameter bite 101DB having a shank height W of 16 mm has a distance dx of 12 mm and a distance dy of 8 mm. The outer diameter bite 101DB having a shank height W of 25 mm has a distance dx of 19.5 mm and a distance dy of 12.5 mm. The outer diameter bite 101DB having a shank height W of 40 mm has a distance dx of 30 mm and a distance dy of 20 mm. The outer diameter bite 101DB having a shank height W of 50 mm has a distance dx of 38 mm and a distance dy of 25 mm. The distances dx and dy in the outer diameter tool 101DB are values conforming to ISO. Further, the sword bite 101SB having a shank height W of 8 mm has a distance dx of 0 mm and a distance dy of 4 mm. The sword bite 101SB having a shank height W of 16 mm has a distance dx of 0 mm and a distance dy of 8 mm. The sword bite 101SB having a shank height W of 25 mm has a distance dx of 0 mm and a distance dy of 12.5 mm. The sword bite 101SB having a shank height W of 40 mm has a distance dx of 0 mm and a distance dy of 20 mm. The sword bite 101SB having a shank height W of 50 mm has a distance dx of 0 mm and a distance dy of 25 mm. The distances dx and dy in the sword bite 101SB are ISO-compliant values.

FIG. 51 is a diagram showing the relationship between the shank height and the equal strain distance in an outer diameter tool which is an example of a cutting tool according to the first embodiment of the present disclosure. In FIG. 51, the round plot shows the equal strain distance Leqx in the outer diameter bite 101DB, and the triangular plot shows the equal strain distance Leqy in the outer diameter bite 101DB. Further, in FIG. 51, the horizontal axis indicates the shank height W [mm], and the vertical axis indicates the equal strain distance [mm].

FIG. 52 is a diagram showing the relationship between the shank height and the equal strain distance in a sword tool which is an example of a cutting tool according to the first embodiment of the present disclosure. In FIG. 52, the round plot shows the equal strain distance Leqx at the sword bite 101SB, and the triangular plot shows the equal strain distance Leqy at the sword bite 101SB. Further, in FIG. 52, the horizontal axis indicates the shank height W [mm], and the vertical axis indicates the equal strain distance [mm].

With reference to FIGS. 51 and 52, in the outer diameter bite 101DB and the sword bite 101SB, the equal strain distances Leqx and Leqy are proportional to the shank height W. Further, the equal strain distance Leqy in the outer diameter bite 101DB and the equal strain distance Leqy in the sword bite 101SB are different from each other. On the other hand, in the outer diameter bite 101DB and the sword bite 101SB having the same shank height W, the equal strain distances Leqx are equal to each other. This is due to the position of the reference point 1K in the outer diameter bite 101DB and the position of the reference point 1K in the sword bite 101SB.

More specifically, as described above, since the distance dx is zero in the sword bite 101SB, even when a load Fy is applied to the shank 10, a moment, that is, torque is not generated around the shaft 17, while the outer diameter bite is used. Since the distance dx is not zero in 101DB, torque is generated by applying the load Fy to the shank 10. Therefore, the shear strain ssy and the maximum shear strain Mssy generated by applying the load Fy to the shank 10 of the outer diameter bite 101SB are due to the influence of the torque, and the load Fy is applied to the shank 10 of the sword bite 101SB. Greater than the resulting shear strain ssy and maximum shear strain Mssy. Since the maximum shear strain Mssy in the outer diameter bite 101SB is larger than the maximum shear strain Mssy in the sword bite 101SB, the equal strain distance Leqy in the outer diameter bite 101DB of a certain shank height W has the same shank height W. It is larger than the equal strain distance Sheqy in the sword bite 101SB. On the other hand, as described above, since the distance dy is equal to each other in the outer diameter bite 101DB and the sword bite 101SB, the influence of the torque generated by applying the load Fx to the shank 10 is equal, and the shear strain generated by the load Fx is applied. The ssx and the maximum shear strain Mssx are equal to each other. Therefore, in the outer diameter bite 101DB and the sword bite 101SB in which the shank heights W are equal to each other, the equal strain distances Leqx are equal to each other.

Here, based on the relationship between the shank height W and the equal strain distance Leqy in the outer diameter bite 101DB and the distance dx, and the relationship between the shank height W and the equal strain distance Leqy in the sword bite 101DB and the equal strain distance dx. The distance Leqy is expressed by the following equation (25).
Leqy = 0.74W + 2.09dx ... (25)

Further, considering the case where the position of the reference point 1K is a position rotated 90 ° counterclockwise about the axis 17 from the position of the reference point 1K shown in FIGS. 38 and 46, the equal strain distance is also considered. Leqx is represented by the following equation (26).
Leqx = 0.74W + 2.09dy ... (26)

That is, the shear strain sensor is mounted at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is smaller than the equal strain distance Leqy represented by the above equation (25). As a result, the strain generated by the application of the load Fy can be measured with higher sensitivity than in the case where the vertical strain sensor is mounted. On the other hand, a vertical strain sensor is mounted at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is larger than the equal strain distance Leqy represented by the above equation (25). As a result, the strain generated by the application of the load Fy can be measured with higher sensitivity than when the shear strain sensor is mounted. Further, a shear strain sensor is mounted at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is smaller than the equal strain distance Leqx represented by the above equation (26). As a result, the strain generated by the application of the load Fx can be measured with higher sensitivity than when the vertical strain sensor is mounted. On the other hand, a vertical strain sensor is mounted at a position on the surface of the shank 10 where the distance from the reference point 1K in the Z direction is larger than the equal strain distance Leqx represented by the above equation (26). As a result, the strain generated by the application of the load Fx can be measured with higher sensitivity than when the shear strain sensor is mounted.

Further, as described with reference to FIGS. 42 to 44 and 48, since the shear strain ssz at each target position Ps is always zero regardless of the distance Ds, it occurs with the application of the load Fz. It is difficult to measure strain using a shear strain sensor.

From the above, when measuring the strain caused by the application of the load Fx, the strain caused by the application of the load Fy, and the strain caused by the application of the load Fz using three strain sensors, 3 It is preferable to select one type of strain sensor as follows. That is, when the shank 10 is a regular square pillar and the distance dx is larger than the distance dy, the distance from the reference point 1K in the Z direction is (0.74 W + 2.09 dx) or more with respect to the load Fx. It is equipped with a vertical strain sensor having the maximum sensitivity, a vertical strain sensor having the maximum sensitivity to the load Fy, and a vertical strain sensor having the maximum sensitivity to the load Fz. Alternatively, at a position where the distance from the reference point 1K in the Z direction is larger than (0.74W + 2.09dy) and less than (0.74W + 2.09dx), the vertical strain sensor having the maximum sensitivity to the load Fx, the load Fy On the other hand, a shear strain sensor having the maximum sensitivity and a vertical strain sensor having the maximum sensitivity to the load Fz are mounted. Alternatively, a shear strain sensor having the maximum sensitivity to the load Fx and a shear strain sensor having the maximum sensitivity to the load Fy at a position where the distance from the reference point 1K in the Z direction is (0.74 W + 2.09 dy) or less. , And a vertical strain sensor with maximum sensitivity to load Fz.

Further, when the shank 10 is a regular square pillar and the distance dy is larger than the distance dx, the distance from the reference point 1K in the Z direction is (0.74 W + 2.09 dy) or more at a position with respect to the load Fx. It is equipped with a vertical strain sensor having the maximum sensitivity, a vertical strain sensor having the maximum sensitivity to the load Fy, and a vertical strain sensor having the maximum sensitivity to the load Fz. Alternatively, at a position where the distance from the reference point 1K in the Z direction is larger than (0.74W + 2.09dx) and less than (0.74W + 2.09dy), the shear strain sensor having the maximum sensitivity to the load Fx, the load Fy On the other hand, a vertical strain sensor having the maximum sensitivity and a vertical strain sensor having the maximum sensitivity to the load Fz are mounted. Alternatively, a shear strain sensor having the maximum sensitivity to the load Fx and a shear strain sensor having the maximum sensitivity to the load Fy at a position where the distance from the reference point 1K in the Z direction is (0.74 W + 2.09 dx) or less. , And a vertical strain sensor with maximum sensitivity to load Fz.

When the shank 10 is a round shank having the same width b and height h, it is preferable to select the type for each mounting position of the three strain sensors in the same manner as when the shank 10 is a regular quadrangular prism. Further, when the shank 10 is a square shank having a height h larger than the width b, or a round shank having a width b larger than the height h, the moment generated when the load Fy is applied to the shank 10. Since the height h, which is an important factor for the above, can be applied to the shank height W, and the selection criteria of the strain sensor can be treated in the same manner as when the shank 10 is a regular quadrangular prism, the mounting positions of the three strain sensors can be handled. It is preferable to select each type in the same manner as when the shank 10 is a regular quadrangular prism.

(Mounting position of shear strain sensor in the axial direction)
From the above, when the strain sensor 20A, which is a shear strain sensor having the maximum sensitivity to the load Fy among the loads Fx, Fy, and Fz, is mounted on the shank 10, the sensor distance Da of the strain sensor 20A is expressed by the following equation ( It is preferable to satisfy 27).
Da <0.74W + 2.09dxa ... (27)

When the strain sensor 20B, which is a shear strain sensor having the maximum sensitivity to the load Fx among the loads Fx, Fy, and Fz, is mounted on the shank 10, the sensor distance Db of the strain sensor 20B is expressed by the following equation (28). ) Is preferably satisfied.
Db <0.74W + 2.09dyb ... (28)

That is, when the shear strain sensor having the maximum sensitivity to the load Fx or the load Fy among the loads Fx, Fy, and Fz is mounted on the shank 10, the sensor distance D of the shear strain sensor is expressed by the following equation (29). It is preferable to meet.
D <0.74W + 2.09maxdxy ... (29)

Further, when another shear strain sensor having the maximum sensitivity to the load Fx or the load Fy among the loads Fx, Fy, and Fz is further mounted on the shank 10, the sensor distance D of the two shear strain sensors is as follows. It is preferable to satisfy the formula (30).
D <0.74W + 2.09mindxy ... (30)

Here, dx is the distance between the center of the shank 10 and the reference point 1K at the mounting position of the shear strain sensor in the X direction. dy is the distance between the center of the shank 10 and the reference point 1K at the mounting position of the shear strain sensor in the Y direction. maxdxy is the larger of dx and dy when dx and dy are different values from each other. When dx and dy are equal values, dx and dy are set to maxdxy. mindxy is the smaller of dx and dy.

(Mounting position of shear strain sensor in the circumferential direction)
(For shear strain ssx, ssy measurement)
As described with reference to FIGS. 42 to 44, the absolute value of the shear strain ssy in the outer diameter bite 101DB becomes a maximum value in the central portion in the circumferential direction of the four surfaces, and in the central portion in the circumferential direction of the side surface S4. It becomes the maximum value. The reason why the absolute value of the shear strain ssy in the outer diameter bite 101DB is the maximum value on the side surface S4 is that in the outer diameter bite 101DB shown in FIG. Because they act in the same direction.

Further, as described with reference to FIG. 48, the absolute value of the shear strain ssy in the sword bite 101SB becomes the maximum value in the central portion in the circumferential direction of the side surfaces S3 and S4. The reason why the absolute value of the shear strain ssy in the sword bite 101SB is the maximum value in the side surfaces S3 and S4 is that in the sword bite 101SB shown in FIG. This is because shear acts in the same direction.

Further, as described with reference to FIGS. 42 to 44, the absolute value of the shear strain ssx in the outer diameter bite 101DB becomes a maximum value in the central portion in the circumferential direction of the four surfaces, and is the center in the circumferential direction of the upper surface S2. It becomes the maximum value in the part. The reason why the absolute value of the shear strain ssx in the outer diameter bite 101DB becomes the maximum value in the upper surface S2 is that in the outer diameter bite 101DB shown in FIG. Because they act in the same direction.

Further, as described with reference to FIG. 48, the absolute value of the shear strain ssx in the sword bite 101SB becomes a maximum value in the central portion in the circumferential direction of the four surfaces, and is a maximum value in the central portion in the circumferential direction of the upper surface S2. It becomes. The reason why the absolute value of the shear strain ssx in the sword bite 101SB is the maximum value in the upper surface S2 is that in the sword bite 101SB shown in FIG. 46, the simple shear due to the load Fx and the torsional shear due to the load Fx are the same on the upper surface S2. Because it acts in the direction.

From the above, when the strain sensor 20A, which is a shear strain sensor having the maximum sensitivity to the load Fy, is mounted on the shank 10 in a general cutting tool 101 such as an outer diameter tool 101DB and a sword tool 101SB, the shank 10 It is preferable to mount it on the central portion of the mounting surface among the four surfaces. Further, when the strain sensor 20B, which is a shear strain sensor having the maximum sensitivity to the load Fx, is mounted on the shank 10 in a general cutting tool 101 such as an outer diameter tool 101DB and a sword tool 101SB, 4 of the shank 10. It is preferable to mount it on the central portion of the mounting surface of the two surfaces. Specifically, for example, when the

strain sensors

20A and 20B are divided into three equal regions in which the mounting surfaces are arranged in the circumferential direction of the shank 10, the

strain sensors

20A and 20B are mounted in the middle region of the three regions. Is preferable. Further, in order to mount the

strain sensors

20A and 20B on the surface on which the simple shear and the torsional shear act in the same direction, one of the

strain sensors

20A and 20B is placed at the reference point 1K on the surface of the shank 10. It is mounted on the first surface, which is the closest surface, and the other of the

strain sensors

20A and 20B is an adjacent surface adjacent to the first surface, which is the second closest surface to the reference point 1K among the surfaces of the shank 10. It is preferable to mount it on the second surface. Specifically, for example, it is preferable to mount the strain sensor 20A on the side surface S4 and mount the strain sensor 20B on the upper surface S2.

(Mounting position of vertical strain sensor in the circumferential direction)
(For vertical strain sny measurement)
As described with reference to FIGS. 39 to 41, the absolute value of the vertical strain snx in the outer diameter bite 101DB is the maximum value in the side surface S3 and the side surface S4. Further, as described with reference to FIG. 47, the absolute value of the vertical strain snx in the sword bite 101SB becomes the maximum value in the side surface S3 and the side surface S4. From the above, when the vertical strain sensor having the maximum sensitivity to the load Fy is mounted on the shank 10 in a general cutting tool 101 such as the outer diameter tool 101DB and the sword tool 101SB, among the four surfaces of the shank 10. It is preferable to mount it on the side surface S3 or the side surface S4.

(For vertical strain snx measurement)
As described with reference to FIGS. 39 to 41, the absolute value of the vertical strain sny in the outer diameter bite 101DB is the maximum value in the bottom surface S1 and the top surface S2. Further, as described with reference to FIG. 47, the absolute value of the vertical strain sny in the sword bite 101SB becomes the maximum value in the bottom surface S1 and the top surface S2. From the above, when the vertical strain sensor having the maximum sensitivity to the load Fx is mounted on the shank 10 in a general cutting tool 101 such as the outer diameter tool 101DB and the sword tool 101SB, among the four surfaces of the shank 10. It is preferable to mount it on the bottom surface S1 and the top surface S2.

(For vertical strain snz measurement-1)
As described with reference to FIGS. 39 to 41, the absolute value of the vertical strain snz in the outer diameter bite 101DB is the vicinity of the boundary portion between the upper surface S2 and the side surface S4 and the vicinity of the boundary portion between the bottom surface S1 and the side surface S3. It becomes the maximum value in the vicinity of the boundary portion between the upper surface S2 and the side surface S4, and becomes the maximum value. With reference to FIG. 38 again, the reason why the absolute value of the vertical strain snz in the outer diameter bite 101DB becomes a maximum value in the vicinity of the boundary portion between the upper surface S2 and the side surface S4 and in the vicinity of the boundary portion between the bottom surface S1 and the side surface S3 is This is because the shank 10 bends due to the load Fz, with the virtual line orthogonal to the virtual line connecting the reference point 1K and the axis 17 as a boundary, that is, a crease. Further, the reason why the absolute value of the vertical strain snz in the vicinity of the boundary portion between the upper surface S2 and the side surface S4 is larger than the absolute value of the vertical strain snz in the vicinity of the boundary portion between the bottom surface S1 and the side surface S3 is shown in FIG. 38. This is because, in the outer diameter bite 101DB shown, the bending moment due to the load Fz and the simple compression due to the load Fz act in the same direction in the vicinity of the boundary portion of the two boundary portions closer to the reference point 1K. According to the verification by the inventor of the present application, the absolute value of the vertical strain snz in the vicinity of the boundary portion closer to the reference point 1K of the two boundary portions is far from the reference point 1K of the two boundary portions. It is about 1.3 times the absolute value of the vertical strain snz in the vicinity of the boundary portion.

From the above, when the strain sensor 20C, which is a vertical strain sensor having the maximum sensitivity to the load Fz, is mounted on the shank 10 in a general cutting tool 101 such as an outer diameter tool 101DB, the four boundary portions in the shank 10 Of these, it is preferable to mount the device in the vicinity of the boundary portion closest to the reference point 1K or in the vicinity of the boundary portion farthest from the reference point 1K. Specifically, for example, when the strain sensor 20C is divided into three equal parts of the second surface of the four surfaces, which is the second closest to the reference point 1K, into three regions arranged in the circumferential direction of the shank 10. The region of the two surfaces closest to the reference point 1K, and the third surface of the four surfaces facing the first surface are divided into three equal regions arranged in the circumferential direction of the shank 10. 3 When it is divided into three equal parts, it is preferable to mount it on one of the regions farthest from the reference point 1K among the three regions on the fourth surface.

(For vertical strain snz measurement-2)
As described with reference to FIG. 47, the absolute value of the vertical strain snz in the sword bite 101SB has a maximum value on the bottom surface S1 and the top surface S2, and a maximum value on the top surface S2. With reference to FIG. 46 again, the reason why the absolute value of the vertical strain snz in the sword bite 101SB becomes the maximum value in the upper surface S2 and the bottom surface S1 is orthogonal to the virtual line connecting the reference point 1K and the axis 17 due to the load Fz. This is because the shank 10 bends with the virtual line as a boundary, that is, a crease. Further, the reason why the absolute value of the vertical strain snz on the upper surface S2 is larger than the absolute value of the vertical strain snz on the bottom surface S1 is that in the sword bite 101SB shown in FIG. 46, the reference point 1K of the bottom surface S1 and the top surface S2 causes. This is because the bending moment due to the load Fz and the simple compression due to the load Fz act in the same direction on the upper surface S2 which is the closer surface.

From the above, when the strain sensor 20C, which is a vertical strain sensor having the maximum sensitivity to the load Fz, is mounted on the shank 10 in a general cutting tool 101 such as a sword bite 101SB, among the four surfaces of the shank 10. It is preferable to mount the surface on the surface closest to the reference point 1K or the surface facing the surface. Specifically, for example, in the sword bite 101SB having a distance dx of zero, when the surface closest to the reference point 1K is the bottom surface S1 or the top surface S2, the strain sensor 20C can be mounted on the bottom surface S1 or the top surface S2. preferable. Further, for example, in the sword bite 101SB having a distance dy of zero, when the surface closest to the reference point 1K is the side surface S3 or the side surface S4, it is preferable to mount the strain sensor 20C on the side surface S3 or the side surface S4.

With reference to FIG. 46 again, in the sword bite 101SB where the distance dx is zero, the absolute value of the vertical strain snz is constant on the bottom surface S1 and constant on the top surface S2. On the other hand, in the cutting tool 101 in which the reference point 1K is displaced in the X direction from directly above the shaft 17 and the distance dx is not zero, the absolute value of the vertical strain snz is not constant on the bottom surface S1 but constant on the top surface S2. do not have. However, the cutting tool 101 in which the difference between the maximum value and the minimum value of the absolute value of the vertical strain snz on the bottom surface S1 and the top surface S2 is 10% or less of the maximum value is the same as that of the sword bite 101SB having a distance dx of zero. It is preferable to mount the strain sensor 20C at the mounting position. More specifically, in the cross section of the shank 10 shown in FIG. 46, the position of the reference point 1K when the reference point 1K is translated to the cross section along the Z direction is along the Y direction from the center of the shank 10. If the straight line extends from the point 17K W / 6 away from the bottom surface S1 and is located between the straight line L1a satisfying the following equation (31) and the straight line L1b satisfying the following equation (31), the distance dx is zero. It is preferable to mount the strain sensor 20C in the same manner as the sword bite 101SB.
10dx = dy + W / 6 ... (31)

Here, the point 17K is a load point when the simple compression by the load Fz and the bending moment due to the load Fz cancel each other out on the upper surface S2 which is the surface closest to the reference point 1K. Further, the straight lines L1a and L1b are load points when the difference between the maximum value and the minimum value of the absolute value of the vertical strain snz on the bottom surface S1 and the top surface S2 is 10% of the maximum value.

When the surface closest to the reference point 1K is the bottom surface S1, the position of the reference point 1K when the reference point 1K is translated to the cross section along the Z direction in the cross section of the shank 10 is the shank 10. A sword bite whose distance dx is zero when it is a straight line extending from a point 17K W / 6 away from the center toward the upper surface S2 along the Y direction and is located between two straight lines satisfying the above equation (31). Like the 101SB, it is preferable to mount the strain sensor 20C. Specifically, for example, when the strain sensor 20C is mounted at a position where the distances dxc and dyc satisfy the above equation (17), it is preferable to mount the strain sensor 20C on the bottom surface S1 or the top surface S2.

When the surface closest to the reference point 1K is the side surface S3 or the side surface S4, the position of the reference point 1K when the reference point 1K is translated into the cross section along the Z direction in the cross section of the shank 10. A straight line extending from the center of the shank 10 along the Y direction toward the surface facing the nearest surface from a point 17K W / 6 away, and located between two straight lines satisfying the following equation (32). It is preferable to mount the strain sensor 20C as in the sword bite 101SB having a distance dy of zero.
10dy = dx + W / 6 ... (32)

Specifically, for example, when the strain sensor 20C is mounted at a position where the distances dxc and dyc satisfy the above equation (23), it is preferable to mount the strain sensor 20C on the side surface S3 or the side surface S4.

[Operation flow]
FIG. 53 is a flowchart defining an example of a mounting method when mounting a strain sensor on a cutting tool according to the first embodiment of the present disclosure. With reference to FIG. 53, first, the user of the cutting tool 101 prepares the shank 10 and the

strain sensors

20A, 20B, 20C (step S102). Next, the user mounts the

strain sensors

20A, 20B, 20C on the surface of the shank 10. More specifically, the

strain sensors

20A, 20B, and 20C are mounted at the mounting positions shown in the first embodiment and the modified examples 1 to 11 described above (step S104).

The cutting tool 101 according to the first embodiment of the present disclosure is configured to include

strain sensors

20A, 20B, 20C, but is not limited thereto. The cutting tool 101 may be configured to include one, two, or four or more strain sensors 20. More specifically, the cutting tool 101 is configured to include at least one strain sensor 20, and the measurement result of the strain of the shank 10 by the strain sensor 20 is used for detecting an abnormality that may occur in the cutting tool 101, for example, during cutting. be able to. For example, when it is known in advance that the load Fy is likely to change when an abnormality occurs in the cutting tool 101, the cutting tool 101 is configured to include the strain sensor 20A, based on the measurement result by the strain sensor 20A. Abnormalities can be detected more accurately.

Further, the cutting tool 101 according to the first embodiment of the present disclosure includes a strain sensor 20A having the maximum sensitivity to the load Fy, a strain sensor 20B having the maximum sensitivity to the load Fx, and a load Fz. It is said that the configuration is provided with the strain sensor 20C having the maximum sensitivity with respect to the above, but the configuration is not limited to this. The cutting tool 101 may be configured to include the strain sensor 20 having the maximum sensitivity to the load Fx or the load Fz instead of the strain sensor 20A. Further, the cutting tool 101 may be configured to include the strain sensor 20 having the maximum sensitivity to the load Fy or the load Fz instead of the strain sensor 20B. Further, the cutting tool 101 may be configured to include the strain sensor 20 having the maximum sensitivity to the load Fx or the load Fy instead of the strain sensor 20C.

Next, other embodiments of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated.

<Second embodiment>
The present embodiment relates to a cutting tool 102 provided with a strain sensor 20D instead of the strain sensor 20B as compared with the cutting tool 101 according to the first embodiment. Except for the contents described below, it is the same as the cutting tool 101 according to the first embodiment. In the second embodiment, it is assumed that the position of the reference point 1K on the XY plane is within the region of the first quadrant Q1 shown in FIG. The position of the reference point 1K in the second embodiment is an example of the position PK1 shown in FIG.

FIG. 54 is a diagram showing an example of the configuration of the cutting tool according to the second embodiment of the present disclosure. With reference to FIG. 54, the cutting tool 102 includes

strain sensors

20A, 20C, 20D as strain sensors 20. For example, the

strain sensors

20A, 20C, 20D are mounted on the side surface S4 of the shank 10. The mounting positions of the

strain sensors

20A and 20C are the same as those in the first embodiment.

For example, the strain sensor 20D is a vertical strain sensor capable of measuring the vertical strain of the shank 10. The strain sensor 20D is an example of a second vertical strain sensor. The strain sensor 20D measures the vertical strain εzz of the shank 10 at the mounting position of the strain sensor 20D. More specifically, the strain sensor 20D has, for example, a measurement axis d1 parallel to the axis 17. The strain sensor 20D measures the strain sd1 in the direction of the measurement axis d1 and outputs an analog signal ASd1 at a level corresponding to the strain sd1 to the above-mentioned wireless communication device as an analog signal ASzz corresponding to the vertical strain εzzz. For example, the strain sensor 20D has the maximum sensitivity to the load Fx among the loads Fx, Fy, and Fz.

(Mounting position of strain sensor 20D in the axial direction)
FIG. 55 is a cross-sectional view showing the configuration of the cutting tool according to the second embodiment of the present disclosure. FIG. 55 is a cross-sectional view taken along the line LV-LV in FIG. 54. In FIG. 55, the position of the reference point 1K when the reference point 1K is translated along the Z direction to the cross section of the LV-LV line arrow is indicated by a black circle. With reference to FIG. 55, the shank height of the shank 10 at the mounting position of the strain sensor 20D is defined as Wd. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20D in the X direction and the reference point 1K of the cutting edge in the chip 1 is defined as the distance dxd. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20D in the Y direction and the reference point 1K is defined as the distance dyd.

When the distance dxd and the distance dyd are different values from each other, the larger one of the distance dxd and the distance dyd is defined as maxdxyd, and the smaller one is defined as mindxyd. When the distance dxd and the distance dyd are equal values, the distance dxd and the distance dyd are set to maxdxyd. In the example shown in FIG. 55, the distance dxd and the distance dyd are different values from each other, and the distance dxd is larger than the distance dyd. Therefore, the distance dxd is set to maxdxyd, and the distance dyd is set to mindxyd. With reference to FIG. 54 again, at this time, assuming that the distance between the mounting position of the strain sensor 20D and the reference point 1K in the Z direction is the sensor distance Dd, the sensor distance Dd satisfies the following equation (33).
0.74Wd + 2.09mindxyd <Dd <0.74Wd + 2.09maxdxyd ... (33)

With such a configuration, the strain sensor 20D can be used to measure the strain generated by the load Fx with higher sensitivity.

(Mounting position of strain sensor 20D in the circumferential direction)
The strain sensor 20D is mounted at an arbitrary position on the side surface S4 adjacent to the bottom surface S1 of the four surfaces of the shank 10. The strain sensor 20D may be mounted at an arbitrary position on the side surface S3. The side surface S3 is an example of the first side surface, and the side surface S4 is an example of the second side surface. According to the cutting tool 102 of the present embodiment, the three-component force of the cutting resistance can be calculated based on the measurement results of the three

strain sensors

20A, 20C, and 20D at the time of cutting.

The mounting method when mounting the strain sensor 20 on the cutting tool 102 is as follows. That is, first, the user of the cutting tool 102 prepares the shank 10 and the

strain sensors

20A, 20C, 20D. Next, the user mounts the

strain sensors

20A, 20C, 20D on the surface of the shank 10. More specifically, the

strain sensors

20A, 20C, 20D are mounted at the above-mentioned mounting positions.

[Modification example]
In the cutting tool 102, the position of the reference point 1K on the XY plane may be in a region other than the first quadrant Q1 shown in FIG. When the position of the reference point 1K on the XY plane is in a region other than the first quadrant Q1, the

strain sensors

20A and 20C are mounted at the mounting positions described in the modified examples 1 to 11 of the first embodiment. As described above, the strain sensor 20D is mounted at an arbitrary position on the side surface S4 or an arbitrary position on the side surface S3 regardless of the position of the reference point 1K.

<Third embodiment>
The present embodiment relates to a cutting tool 102A provided with a strain sensor 20E instead of the strain sensor 20A as compared with the cutting tool 101 according to the first embodiment. Except for the contents described below, it is the same as the cutting tool 101 according to the first embodiment. In the third embodiment, it is assumed that the position of the reference point 1K on the XY plane is within the region of the second quadrant Q2 shown in FIG. The position of the reference point 1K in the third embodiment is an example of the position PK2 shown in FIG.

FIG. 56 is a diagram showing an example of the configuration of the cutting tool according to the third embodiment of the present disclosure. With reference to FIG. 56, the cutting tool 102A includes

strain sensors

20B, 20C, 20E as strain sensors 20. For example, the

strain sensors

20B and 20E are mounted on the upper surface S2 of the shank 10. Further, for example, the strain sensor 20C is mounted on the side surface S4 of the shank 10. The mounting positions of the

strain sensors

20B and 20C are the same as those of the first modification of the first embodiment.

For example, the strain sensor 20E is a vertical strain sensor capable of measuring the vertical strain of the shank 10. The strain sensor 20E is an example of a third vertical strain sensor. The strain sensor 20E measures the vertical strain εzz of the shank 10 at the mounting position of the strain sensor 20E. More specifically, the strain sensor 20E has, for example, a measurement axis e1 parallel to the axis 17. The strain sensor 20E measures the strain se1 in the direction of the measurement axis e1 and outputs an analog signal ASe1 at a level corresponding to the strain se1 to the above-mentioned wireless communication device as an analog signal ASzz corresponding to the vertical strain εzzz. For example, the strain sensor 20E has the maximum sensitivity to the load Fy among the loads Fx, Fy, and Fz.

(Mounting position of strain sensor 20E in the axial direction)
FIG. 57 is a cross-sectional view showing the configuration of the cutting tool according to the third embodiment of the present disclosure. FIG. 57 is a cross-sectional view taken along the line LVII-LVII in FIG. 56. In FIG. 57, the position of the reference point 1K when the reference point 1K is translated along the Z direction to the cross section of the LVII-LVII line arrow is indicated by a black circle. With reference to FIG. 57, the shank height of the shank 10 at the mounting position of the strain sensor 20E is defined as We. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20E in the X direction and the reference point 1K of the cutting edge in the chip 1 is defined as the distance dxe. Further, the distance between the center of the shank 10 at the mounting position of the strain sensor 20E in the Y direction and the reference point 1K is defined as the distance dye.

When the distance dxe and the distance dye have different values, the larger one of the distance dexe and the distance dye is defined as maxdxye, and the smaller one is defined as mindxye. When the distance dxe and the distance dye are equal values, the distance dexe and the distance dye are set to maxdxye. In the example shown in FIG. 57, the distance dxe and the distance dye are different values from each other, and the distance dexe is larger than the distance dye. Therefore, the distance dxe is set to maxdxye, and the distance dye is set to mindxye. With reference to FIG. 56 again, at this time, assuming that the distance between the mounting position of the strain sensor 20E and the reference point 1K in the Z direction is the sensor distance De, the sensor distance De satisfies the following equation (34).
0.74We + 2.09mindxye <De <0.74We + 2.09maxdxye ... (34)

With such a configuration, the strain sensor 20E can be used to measure the strain generated by the load Fy with higher sensitivity.

(Mounting position of strain sensor 20E in the circumferential direction)
The strain sensor 20E is mounted at an arbitrary position on the upper surface S2 of the four surfaces of the shank 10. The strain sensor 20E may be mounted at an arbitrary position on the bottom surface S1. According to the cutting tool 102A of the present embodiment, the three-component force of the cutting resistance can be calculated based on the measurement results of the three

strain sensors

20B, 20C, and 20E at the time of cutting.

The mounting method when mounting the strain sensor 20 on the cutting tool 102A is as follows. That is, first, the user of the cutting tool 102A prepares the shank 10 and the

strain sensors

20B, 20C, 20E. Next, the user mounts the

strain sensors

20B, 20C, 20E on the surface of the shank 10. More specifically, the

strain sensors

20B, 20C, 20E are mounted at the above-mentioned mounting positions.

[Modification example]
In the cutting tool 102A, the position of the reference point 1K on the XY plane may be in a region other than the second quadrant Q2 shown in FIG. The

strain sensors

20B and 20C will be described in the first embodiment and the modifications 2 to 11 of the first embodiment when the position of the reference point 1K on the XY plane is in a region other than the second quadrant Q2. It is mounted in the mounting position. As described above, the strain sensor 20E is mounted at an arbitrary position on the upper surface S2 or an arbitrary position on the bottom surface S1 regardless of the position of the reference point 1K.

<Fourth Embodiment>
The present embodiment relates to a cutting tool 102B having a strain sensor 20E instead of the strain sensor 20A and a strain sensor 20D instead of the strain sensor 20B, as compared with the cutting tool 101 according to the first embodiment. Except for the contents described below, it is the same as the cutting tool 101 according to the first embodiment. In the fourth embodiment, it is assumed that the position of the reference point 1K on the XY plane is within the region of the first quadrant Q1 shown in FIG. The position of the reference point 1K in the fourth embodiment is an example of the position PK1 shown in FIG.

FIG. 58 is a diagram showing an example of the configuration of the cutting tool according to the fourth embodiment of the present disclosure. With reference to FIG. 58, the cutting tool 102B includes

strain sensors

20C, 20D, 20E as strain sensors 20. For example, the strain sensor 20E is mounted on the upper surface S2 of the shank 10. Further, for example, the

strain sensors

20C and 20D are mounted on the side surface S4 of the shank 10. The mounting position of the strain sensor 20C is the same as that of the first embodiment.

(Mounting position of

strain sensors

20D and 20E)
The sensor distance Dd in the Z direction satisfies the following equation (35). Further, the sensor distance De in the Z direction satisfies the following equation (36).
0.74Wd + 2.09maxdxyd <Dd ... (35)
0.74We + 2.09maxdxye <De ... (36)

The mounting position of the strain sensor 20D in the circumferential direction is the same as the mounting position described in the second embodiment. The mounting position of the strain sensor 20E in the circumferential direction is the same as the mounting position described in the third embodiment. According to the cutting tool 102B of the present embodiment, the three-component force of the cutting resistance can be calculated based on the measurement results of the three

strain sensors

20C, 20D, and 20E at the time of cutting.

The mounting method when mounting the strain sensor 20 on the cutting tool 102B is as follows. That is, first, the user of the cutting tool 102B prepares the shank 10 and the

strain sensors

20C, 20D, 20E. Next, the user mounts the

strain sensors

20C, 20D, 20E on the surface of the shank 10. More specifically, the

strain sensors

20C, 20D, 20E are mounted at the above-mentioned mounting positions.

[Modification example]
In the cutting tool 102B, the position of the reference point 1K on the XY plane may be in a region other than the first quadrant Q1 shown in FIG. When the position of the reference point 1K on the XY plane is in a region other than the first quadrant Q1, the strain sensor 20C is mounted at the mounting position described in the modified examples 1 to 11 of the first embodiment.

[Example of modification of the mounting position of the strain sensor]
59 and 60 are views showing another example of the mounting position of the strain sensor in the cutting tool according to the first to fourth embodiments of the present disclosure. FIG. 59 shows a cross section of the shank 10, which is a square shank, in a direction perpendicular to the longitudinal direction. FIG. 60 shows a cross section of the shank 10, which is a round shank, in a direction perpendicular to the longitudinal direction. With reference to FIGS. 59 and 60, for example, the shank 10 has a recess 22A with an engraving depth of hd in the height direction HD. The strain sensor 20 is attached to the surface of the shank 10 inside the recess 22A. In this case, the height hsen of the shank 10 shown in FIGS. 59 and 60 shall be defined as follows. That is, when the height hsen assuming that the shank 10 is not provided with the recess 22A is hx, when hd / hx is less than 0.2, hx is the height hsen and hd / hx is 0. If it is 2 or more, (hx-hd) is defined as the height hsen. Further, for example, the strain sensor 20 may be attached to the surface of the shank 10 inside the recess in which the engraving depth in the width direction WD of the shank 10 is bd. In this case, the width bsen of the shank 10 is defined as follows, similarly to the height hsen. That is, when the width bsen assuming that the shank 10 is not provided with the recess is bx, when bd / bx is less than 0.2, bx is the width bsen and bd / bx is 0.2 or more. If, (bx-bd) is the width bsen.

It should be considered that the above embodiment is exemplary in all respects and is not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

1 Chip 1K Reference point 10 Shank 17 Axis 20 Strain sensor 22A Recess 3A,

3B Fixing member

50A, 50B

Cutting tool stand

101, 101A to

101K Cutting tool

102, 102A, 102B Cutting tool 101DB Outer diameter tool 101SB Sword tool 110 Wireless communication part 120 Processing unit 130 Storage unit 201 Processing device 301 Cutting system S1 Bottom surface S2 Top surface S3 Side surface S4 Side surface

Claims

A cutting tool for turning
With a shank that has or can be fitted with a cutting edge,
With a sensor mounted on the surface of the shank,
The sensor is a shear strain sensor capable of measuring the shear strain of the shank.
The shank height of the shank is W, and the center of the shank and the reference point of the cutting edge at the mounting position in the first direction parallel to the bottom surface of the shank and perpendicular to the axis of the shank. The distance between the shank and the reference point is defined as the distance dx, and the distance between the center of the shank and the reference point at the mounting position in the second direction orthogonal to the bottom surface of the shank is defined as the distance dy. The distance between the mounting position and the reference point in the third direction, which is a parallel direction, is defined as the sensor distance D, and when the distance dx and the distance dy are different values, the distance dx and the distance dy are used. When the larger one is maxdxy and the distance dx and the distance dy are equal to each other and the distance dx and the distance dy are maxdxy.
The sensor distance D of the shear strain sensor satisfies the equation (1).
D <0.74W + 2.09maxdxy ... (1)
Cutting tools.
When the smaller of the distance dx and the distance dy is mindxy,
The sensor distance D of the shear strain sensor satisfies the equation (2).
D <0.74W + 2.09mindxy ... (2)
The cutting tool according to claim 1.
The cutting tool comprises a plurality of the sensors.
At least two of the plurality of sensors are the shear strain sensors.
The cutting tool according to claim 2, wherein the sensor distance D of each of the two shear strain sensors satisfies the formula (2).
One of the two shear strain sensors is the first load, which is the load in the first direction, the second load, which is the load in the second direction, and the third load, which is the load in the third direction. Has maximum sensitivity to the second load and has maximum sensitivity
The cutting tool according to claim 3, wherein the other of the two shear strain sensors has the maximum sensitivity to the first load among the first load, the second load and the third load.
The cutting tool comprises a plurality of the sensors.
The cutting tool according to any one of claims 1 to 4, wherein at least one of the plurality of sensors is a vertical strain sensor capable of measuring the vertical strain of the shank.
The vertical strain sensor is used as the third load among the first load which is the load in the first direction, the second load which is the load in the second direction, and the third load which is the load in the third direction. The cutting tool according to claim 5, which has the maximum sensitivity.
When the smaller of the distance dx and the distance dy is mindxy,
The sensor distance D of the vertical strain sensor satisfies the equation (3).
0.74W + 2.09mindxy <D <0.74W + 2.09maxdxy ... (3)
When the distance dx is larger than the distance dy, the vertical strain sensor is a first load which is a load in the first direction, a second load which is a load in the second direction, and a load in the third direction. Among the third loads, it has the maximum sensitivity to the first load and has the highest sensitivity.
The vertical strain sensor has the highest sensitivity to the second load among the first load, the second load, and the third load when the distance dy is larger than the distance dx. The cutting tool according to 5.
A cutting tool for turning
With a shank that has or can be fitted with a cutting edge,
With a sensor mounted on the surface of the shank,
The sensor is a first shear strain sensor capable of measuring the shear strain of the shank.
The shank contains four surfaces surrounding the axis and comprises four surfaces.
The first shear strain sensor is included in the three regions when the mounting surface, which is at least one of the four surfaces, is divided into three regions arranged in the circumferential direction of the shank. A cutting tool mounted in the above area in the middle.
According to claim 8, the first shear strain sensor is mounted in the middle of the five regions when the mounting surface is divided into five regions arranged in the circumferential direction of the shank. The cutting tool described.
The cutting tool according to claim 8 or 9, wherein the first shear strain sensor is mounted on the surface of the four surfaces closest to the reference point of the cutting edge.
The cutting tool further
As the sensor, a second shear strain sensor capable of measuring the shear strain of the shank is provided.
The second shear strain sensor is located in the middle of the three regions when the adjacent surface of the four surfaces adjacent to the mounting surface is divided into three equal regions arranged in the circumferential direction of the shank. The cutting tool according to any one of claims 8 to 10, which is mounted in the area.
The second shear strain sensor is mounted on the region in the middle of the five regions when the adjacent surface is divided into five regions arranged in the circumferential direction of the shank. The cutting tool described.
The cutting tool according to claim 11 or 12, wherein the second shear strain sensor is mounted on the surface of the four surfaces that is second closest to the reference point of the cutting edge.
One of the first shear strain sensor and the second shear strain sensor is a first load which is parallel to the bottom surface of the shank and is a load in a direction orthogonal to the axis, and a load in a direction orthogonal to the bottom surface. It has the maximum sensitivity to the first load among the second load which is a load and the third load which is a load in the direction parallel to the axis.
The other of the first shear strain sensor and the second shear strain sensor has the highest sensitivity to the second load among the first load, the second load and the third load. The cutting tool according to any one of items 11 to 13.
A cutting tool for turning
With a shank that has or can be fitted with a cutting edge,
With a sensor mounted on the surface of the shank,
The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank.
The shank contains four surfaces surrounding the axis and comprises four surfaces.
The first vertical strain sensor divides the first surface of the four surfaces closest to the reference point of the cutting edge into three regions arranged in the circumferential direction of the shank into three equal parts. The region closest to the reference point among the three regions in the above, and the second surface of the four surfaces closest to the reference point are divided into three equal regions arranged in the circumferential direction of the shank. 3 When divided into three equal parts, the region farthest from the reference point among the three regions on the third surface and the fourth surface of the four surfaces facing the second surface are formed. Cutting that is mounted on any one of the regions farthest from the reference point among the three regions on the fourth surface when divided into three regions arranged in the circumferential direction of the shank. tool.
The first vertical strain sensor is the closest to the reference point among the five regions on the first surface when the first surface is divided into five equal regions arranged in the circumferential direction of the shank. The region, the region closest to the reference point among the five regions on the second surface when the second surface is divided into five regions arranged in the circumferential direction of the shank, the third surface. When the shank is divided into five regions arranged in the circumferential direction, the region farthest from the reference point among the five regions on the third surface, and the fourth surface in the circumferential direction of the shank. 15. The 15. 10. Cutting tools.
A cutting tool for turning
With a shank that has or can be fitted with a cutting edge,
With a sensor mounted on the surface of the shank,
The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank.
The shank contains four surfaces surrounding the axis and comprises four surfaces.
The surface of the four surfaces closest to the reference point of the cutting edge is designated as the first surface, and the surface of the four surfaces closest to the reference point is designated as the second surface. When the surface of the surface facing the first surface is used as the third surface and the surface of the four surfaces facing the second surface is used as the fourth surface, the first surface and the first surface are used. One of the three surfaces is the bottom surface of the shank.
The shank height of the shank is W, and the center of the shank and the cutting edge at the mounting position of the first vertical strain sensor in a direction parallel to the bottom surface of the shank and orthogonal to the axis of the shank. Equation (4) is satisfied when the distance between the reference point and the reference point is defined as the distance dx and the distance between the center of the shank and the reference point at the mounting position in the direction perpendicular to the bottom surface is defined as the distance dy. ,
10dx≤dy + W / 6 ... (4)
The first vertical strain sensor is a cutting tool mounted on the first surface or the third surface.
A cutting tool for turning
With a shank that has or can be fitted with a cutting edge,
With a sensor mounted on the surface of the shank,
The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank.
The shank contains four surfaces surrounding the axis and comprises four surfaces.
The surface of the four surfaces closest to the reference point of the cutting edge is designated as the first surface, and the surface of the four surfaces closest to the reference point is designated as the second surface. When the surface of the surface facing the first surface is used as the third surface and the surface of the four surfaces facing the second surface is used as the fourth surface, the second surface and the first surface are used. One of the four surfaces is the bottom surface of the shank.
The shank height of the shank is W, and the center of the shank and the cutting edge at the mounting position of the first vertical strain sensor in a direction parallel to the bottom surface of the shank and orthogonal to the axis of the shank. Equation (5) is satisfied when the distance between the reference point and the reference point is defined as the distance dx and the distance between the center of the shank and the reference point at the mounting position in the direction perpendicular to the bottom surface is defined as the distance dy. ,
10dy ≤ dx + W / 6 ... (5)
The first vertical strain sensor is a cutting tool mounted on the first surface or the third surface.
The cutting tool further
The sensor includes a first shear strain sensor and a second shear strain sensor capable of measuring the shear strain of the shank.
The first shear strain sensor is mounted in the middle of the three regions when the first surface is divided into three equal regions arranged in the circumferential direction of the shank.
The second shear strain sensor is mounted in the middle of the three regions when the second surface is divided into three equal regions arranged in the circumferential direction of the shank.
The first vertical strain sensor has a first load that is parallel to the bottom surface of the shank and is a load in a direction orthogonal to the axis, a second load that is a load in a direction orthogonal to the bottom surface, and the axis. Of the third load, which is a load in the direction parallel to the above, it has the maximum sensitivity to the third load.
One of the first shear strain sensor and the second shear strain sensor has the maximum sensitivity to the first load among the first load, the second load and the third load.
The other of the first shear strain sensor and the second shear strain sensor has the highest sensitivity to the second load among the first load, the second load and the third load. The cutting tool according to any one of items 15 to 18.
The cutting tool further
As the sensor, a third vertical strain sensor capable of measuring the vertical strain of the shank and a shear strain sensor capable of measuring the shear strain of the shank are provided.
The third vertical strain sensor is mounted on the bottom surface of the shank of the four surfaces or the top surface of the four surfaces facing the bottom surface.
When the surface of the bottom surface and the top surface closest to the reference point is divided into three equal parts in the circumferential direction of the shank, the shear strain sensor is located in the middle of the three regions. Installed,
The first vertical strain sensor has a first load that is parallel to the bottom surface and is a load in a direction orthogonal to the axis, a second load that is a load in a direction orthogonal to the bottom surface, and parallel to the axis. Of the third load, which is a load in the above direction, it has the maximum sensitivity to the third load.
The third vertical strain sensor has the maximum sensitivity to the second load among the first load, the second load and the third load.
The method according to any one of claims 15 to 18, wherein the shear strain sensor has the maximum sensitivity to the first load among the first load, the second load, and the third load. Cutting tool.
The cutting tool further
The sensor includes a second vertical strain sensor capable of measuring the vertical strain of the shank and a shear strain sensor capable of measuring the shear strain of the shank.
The second vertical strain sensor is mounted on the first side surface of the four surfaces adjacent to the bottom surface of the shank, or on the second side surface of the four surfaces facing the first side surface.
When the shear strain sensor divides the surface of the first side surface and the second side surface closest to the reference point into three regions arranged in the circumferential direction of the shank, the shear strain sensor is in the middle of the three regions. Mounted in the area of
The first vertical strain sensor has a first load that is parallel to the bottom surface and is a load in a direction orthogonal to the axis, a second load that is a load in a direction orthogonal to the bottom surface, and parallel to the axis. Of the third load, which is a load in the above direction, it has the maximum sensitivity to the third load.
The second vertical strain sensor has the maximum sensitivity to the first load among the first load, the second load and the third load.
The method according to any one of claims 15 to 18, wherein the shear strain sensor has the maximum sensitivity to the second load among the first load, the second load, and the third load. Cutting tool.
The cutting tool further
The sensor includes a second vertical strain sensor and a third vertical strain sensor capable of measuring the vertical strain of the shank.
The second vertical strain sensor is mounted on the first side surface of the four surfaces adjacent to the bottom surface of the shank, or on the second side surface of the four surfaces facing the first side surface.
The third vertical strain sensor is mounted on the bottom surface of the shank of the four surfaces or the top surface of the four surfaces facing the bottom surface.
The first vertical strain sensor has a first load that is parallel to the bottom surface and is a load in a direction orthogonal to the axis, a second load that is a load in a direction orthogonal to the bottom surface, and parallel to the axis. Of the third load, which is a load in the above direction, it has the maximum sensitivity to the third load.
The second vertical strain sensor has the maximum sensitivity to the first load among the first load, the second load and the third load.
The third vertical strain sensor is any one of claims 15 to 18, which has the maximum sensitivity to the second load among the first load, the second load, and the third load. Cutting tools described in the section.
The cutting tool according to any one of claims 1 to 22, wherein the width of the shank and the shank height of the shank are equal to each other.
The cutting tool according to any one of claims 1 to 23, and the cutting tool.
Equipped with a processing device
The processing device is a cutting system that detects an abnormality related to the cutting tool based on the measurement result of the sensor at the time of cutting.
It is a mounting method in which a sensor is mounted on a cutting tool for turning.
A step of preparing a shank having or attaching a cutting edge and the sensor.
Including a step of mounting the sensor on the surface of the shank.
The sensor is a shear strain sensor capable of measuring the shear strain of the shank.
In the step of mounting the sensor, the shank height of the shank is W, and the shank at the mounting position in the first direction parallel to the bottom surface of the shank and perpendicular to the axis of the shank. The distance between the center of the shank and the reference point of the cutting edge is defined as the distance dx, and the distance between the center of the shank at the mounting position and the reference point in the second direction perpendicular to the bottom surface of the shank. The distance is defined as the distance dy, the distance between the mounting position and the reference point in the third direction parallel to the axis is defined as the sensor distance D, and the distance dx and the distance dy are different values from each other. In this case, the larger of the distance dx and the distance dy is set to maxdxy, and when the distance dx and the distance dy are equal values and the distance dx and the distance dy are set to maxdxy, the shear strain sensor of the shear strain sensor. The shear strain sensor is mounted on the surface of the shank so that the sensor distance D satisfies the equation (6).
D <0.74W + 2.09maxdxy ... (6)
Mounting method.
It is a mounting method in which a sensor is mounted on a cutting tool for turning.
A step of preparing a shank having or attaching a cutting edge and the sensor.
Including a step of mounting the sensor on the surface of the shank.
The sensor is a shear strain sensor capable of measuring the shear strain of the shank.
The shank contains four surfaces surrounding the axis and comprises four surfaces.
In the step of mounting the sensor, the shear strain sensor is divided into three equal parts of the mounting surface, which is at least one of the four surfaces of the shank, into three regions arranged in the circumferential direction of the shank. A mounting method that is sometimes mounted in the middle of the three regions.
It is a mounting method in which a sensor is mounted on a cutting tool for turning.
A step of preparing a shank having or attaching a cutting edge and the sensor.
Including a step of mounting the sensor on the surface of the shank.
The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank.
The shank contains four surfaces surrounding the axis and comprises four surfaces.
In the step of mounting the sensor, the first vertical strain sensor is placed in three regions of the four surfaces in which the first surface closest to the reference point of the cutting edge is aligned in the circumferential direction of the shank. When equally divided, the region closest to the reference point among the three regions on the first surface, and the second surface of the four surfaces closest to the reference point in the circumferential direction of the shank. When divided into three equal parts, the region closest to the reference point among the three regions on the second surface, and the third surface facing the first surface among the four surfaces. Is divided into three regions arranged in the circumferential direction of the shank, the region farthest from the reference point among the three regions on the third surface, and the first of the four surfaces. When the fourth surface facing the two surfaces is divided into three equal parts in the circumferential direction of the shank, any of the three regions on the fourth surface that is farthest from the reference point. The mounting method to mount on one.
It is a mounting method in which a sensor is mounted on a cutting tool for turning.
A step of preparing a shank having or attaching a cutting edge and the sensor.
Including a step of mounting the sensor on the surface of the shank.
The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank.
The shank contains four surfaces surrounding the axis and comprises four surfaces.
The surface of the four surfaces closest to the reference point of the cutting edge is designated as the first surface, and the surface of the four surfaces closest to the reference point is designated as the second surface. When the surface of the surface facing the first surface is used as the third surface and the surface of the four surfaces facing the second surface is used as the fourth surface, the first surface and the first surface are used. One of the three surfaces is the bottom surface of the shank.
In the step of mounting the sensor, the shank height of the shank is W, and the first vertical strain sensor is mounted at a direction parallel to the bottom surface of the shank and orthogonal to the axis of the shank. The distance between the center of the shank and the reference point of the cutting edge is defined as the distance dx, and the distance between the center of the shank and the reference point at the mounting position in the direction perpendicular to the bottom surface of the shank is the distance. When dy is set, the first vertical strain sensor is mounted on the first surface or the third surface so as to satisfy the equation (7).
10dx≤dy + W / 6 ... (7)
Mounting method.
It is a mounting method in which a sensor is mounted on a cutting tool for turning.
A step of preparing a shank having or attaching a cutting edge and the sensor.
Including a step of mounting the sensor on the surface of the shank.
The sensor is a first vertical strain sensor capable of measuring the vertical strain of the shank.
The shank contains four surfaces surrounding the axis and comprises four surfaces.
The surface of the four surfaces closest to the reference point of the cutting edge is designated as the first surface, and the surface of the four surfaces closest to the reference point is designated as the second surface. When the surface of the surface facing the first surface is used as the third surface and the surface of the four surfaces facing the second surface is used as the fourth surface, the second surface and the first surface are used. One of the four surfaces is the bottom surface of the shank.
In the step of mounting the sensor, the shank height of the shank is W, and the first vertical strain sensor is mounted at a direction parallel to the bottom surface of the shank and orthogonal to the axis of the shank. The distance between the center of the shank and the reference point of the cutting edge is defined as the distance dx, and the distance between the center of the shank and the reference point at the mounting position in the direction perpendicular to the bottom surface of the shank is the distance. When dy is set, the first vertical strain sensor is mounted on the first surface or the third surface so as to satisfy the equation (8).
10dy ≤ dx + W / 6 ... (8)
Mounting method.