WO2021049337A1

WO2021049337A1 - Cutting tool, cutting system, processing method, and processing program

Info

Publication number: WO2021049337A1
Application number: PCT/JP2020/032805
Authority: WO
Inventors: 小池雄介; 青木友弥
Original assignee: 住友電気工業株式会社
Priority date: 2019-09-09
Filing date: 2020-08-31
Publication date: 2021-03-18
Also published as: JP6885529B1; JPWO2021049337A1

Abstract

This cutting tool comprises: a shaft part to which sensors can be attached; and a position changing unit that can change the positions at which the sensors are attached to the shaft part.

Description

Cutting tools, cutting systems, processing methods and processing programs

The present disclosure relates to cutting tools, cutting systems, processing methods and processing programs.
This application claims priority on the basis of Japanese Application Japanese Patent Application No. 2019-163698 filed on 9 September 2019 and incorporates all of its disclosures herein.

Patent Document 1 (Japanese Patent Publication No. 2009-542446) discloses the following system. That is, it is a system having a container (1) and accommodating parts in a tool holder (20), wherein the tool holder (20) has a first end portion (21) and a second end portion (22). ), The first end (21) of the tool holder (20) is fixed to the machine tool, and the second end (22) is adapted to attach the cutting edge. The tool holder (20) comprises an internal cavity (23) surrounded by a cavity wall, the cavity (23) containing the container (1), and the container at least in the central portion (2) and at the ends. A portion (3, 4) is provided, the terminal portion (3, 4) is connected to the central portion (2), and at least one of the terminal portions forms a lid and can be released. At least one contact area (5) connected to the central portion so that the central portion (2) is in contact with the cavity wall in the tool holder (20), and a cooling medium. It comprises an outer surface having at least one gap region (6) made in contact with the cavity (23) so that one end of the cavity (23) is connected to a supply for the cooling medium. The other end is connected to an outlet for the cooling medium, the cavity (23) has an opening (25) for mounting the container (1), and at least one for feeding the cooling medium. A gap is formed between the container (1) and the cavity wall so that the container (1) accommodates the parts.

Special Table 2009-542446

The cutting tool of the present disclosure includes a shaft portion to which a sensor can be attached and a position changing portion capable of changing the attachment position of the sensor on the shaft portion.

The cutting system of the present disclosure includes a cutting tool and a management device, and the cutting tool includes a shaft portion, a sensor attached to the shaft portion, a position changing portion capable of changing the attachment position of the sensor, and a position changing portion. The wireless communication device includes a wireless communication device attached to the shaft portion, the wireless communication device transmits sensor information indicating a measurement result of the sensor, and the management device receives the sensor information from the cutting tool.

The processing method of the present disclosure is a processing method using a cutting tool, and the cutting tool includes a shaft portion to which a sensor can be attached and a position changing portion capable of changing the attachment position of the sensor on the shaft portion. The processing method includes a step of cutting an object to be cut by the cutting tool attached to a machine tool and accumulating the measurement results of the sensor, and a step of changing the attachment position of the sensor by the position changing portion. The step includes cutting an object to be cut by the cutting tool whose mounting position of the sensor has been changed, accumulating the measurement results of the sensor, and processing the accumulated measurement results.

The processing program of the present disclosure is a processing program used in a management device that manages a cutting tool, and the cutting tool can change a shaft portion to which a sensor can be attached and a mounting position of the sensor on the shaft portion. A pre-cutting tool attached to a machine tool is used to cut an object to be cut by providing a position changing portion, the mounting position of the sensor is changed by the position changing portion, and the mounting position of the sensor is changed. When the cutting object is cut by the cutting tool, a storage processing unit that writes the measurement result of the sensor to the storage unit each time the cutting is performed, and each of the storage processing units written by the storage processing unit. This is a program for functioning as a control unit that processes measurement results.

FIG. 1 is a side view showing a configuration of a cutting tool according to the first embodiment of the present disclosure. FIG. 2 is an arrow view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. FIG. 3 is an arrow view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. FIG. 4 is a side view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. FIG. 5 is an arrow view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. FIG. 6 is an arrow view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. FIG. 7 is a side view schematically showing a cutting tool according to the first embodiment of the present disclosure. FIG. 8 is a graph showing the result of simulating the cutting tool according to the first embodiment of the present disclosure. FIG. 9 is a diagram showing a configuration of a cutting system according to the first embodiment of the present disclosure. FIG. 10 is a diagram showing a configuration of a management device in the cutting system according to the first embodiment of the present disclosure. FIG. 11 is a diagram showing an example of analysis results in the management device in the cutting system according to the first embodiment of the present disclosure. FIG. 12 is a diagram showing an example of analysis results in the management device in the cutting system according to the first embodiment of the present disclosure. FIG. 13 is a diagram showing an example of analysis results in the management device in the cutting system according to the first embodiment of the present disclosure. FIG. 14 is a diagram showing an example of analysis results in the management device in the cutting system according to the first embodiment of the present disclosure. FIG. 15 is a diagram showing another example of the configuration of the cutting tool according to the first embodiment of the present disclosure. FIG. 16 is a cross-sectional view schematically showing another example of a cutting tool according to the first embodiment of the present disclosure. FIG. 17 is a cross-sectional view schematically showing another example of the cutting tool according to the first embodiment of the present disclosure. FIG. 18 is a cross-sectional view schematically showing another example of a cutting tool according to the first embodiment of the present disclosure. FIG. 19 is a cross-sectional view schematically showing another example of a cutting tool according to the first embodiment of the present disclosure. FIG. 20 is a cross-sectional view schematically showing another example of a cutting tool according to the first embodiment of the present disclosure. FIG. 21 is a diagram showing a modified example 1 of the cutting system according to the first embodiment of the present disclosure. FIG. 22 is a side view schematically showing a cutting tool according to a modification 1 of the first embodiment of the present disclosure. FIG. 23 is a graph showing the result of simulating the cutting tool in the first modification of the first embodiment of the present disclosure. FIG. 24 is a diagram showing a cutting system according to a second modification of the first embodiment of the present disclosure. FIG. 25 is a flowchart defining the procedure of the processing method according to the second embodiment of the present disclosure. FIG. 26 is a side view schematically showing the cutting tool, the tool holder, and the spindle according to the second embodiment of the present disclosure. FIG. 27 is a graph showing three components of the acceleration measurement result calculated by the processing method according to the second embodiment of the present disclosure. FIG. 28 is a flowchart defining the operation procedure of the management device in the cutting system according to the second embodiment of the present disclosure.

Conventionally, cutting tools such as milling cutters and drills have been developed.

[Issues to be solved by this disclosure]
By attaching a sensor to the cutting tool, it is possible to measure a physical quantity indicating the state of machining by the cutting tool. An excellent technique using such measurement is desired.

The present disclosure has been made to solve the above-mentioned problems, and an object thereof is a cutting tool, a cutting system, a processing method, and a cutting tool capable of measuring a state of machining by a cutting tool under a wider variety of machining conditions. It is to provide a processing program.

[Effect of the present disclosure]
According to the present disclosure, it is possible to measure the state of machining with a cutting tool under a wider variety of machining conditions.

[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 includes a shaft portion to which a sensor can be attached and a position changing portion capable of changing the attachment position of the sensor on the shaft portion.

In this way, the size of the measurement result such as acceleration can be changed by changing the position of the sensor due to the configuration in which the mounting position of the sensor on the shaft portion can be changed. Thereby, the sensitivity of the sensor can be easily changed according to the processing conditions. Therefore, it is possible to measure the state of machining with a cutting tool under a wider variety of machining conditions.

(2) Preferably, the shaft portion has a rod shape and includes a diameter-expanded portion, and the diameter-expanded portion has a larger diameter than other portions of the shaft portion, and the sensor can be attached to the shaft portion. The position changing portion can change the mounting position of the sensor in the enlarged diameter portion.

With such a configuration, the enlarged diameter part increases the rigidity of the shaft part. Therefore, for example, even when the sensor is attached by removing a part of the shaft portion, the sensor can be attached to the shaft portion while ensuring the rigidity of the shaft portion.

(3) Preferably, the position changing portion can change the position of the sensor along the axial direction of the shaft portion.

With such a configuration, it is possible to change the position of the sensor capable of measuring the acceleration generated in the cutting tool when cutting the object to be cut, and change the sensitivity of the measurement result of the sensor. This makes it possible to measure the acceleration and the like generated in the cutting tool while cutting the object to be cut. Further, the position of the sensor in the direction along the axial direction of the shaft portion is involved in the bending component of the displacement generated in the cutting tool due to cutting. With the above configuration, the value related to the bending component can be calculated.

(4) Preferably, the position changing portion can change the position of the sensor along the radial direction of the shaft portion.

With such a configuration, the position of the sensor capable of measuring the centrifugal acceleration generated when the cutting tool rotates regardless of whether or not the object to be cut is being cut is changed, and the sensitivity of the measurement result of the sensor is changed. can do. This makes it possible to measure the centrifugal acceleration and the like generated in the cutting tool when the cutting tool rotates. Further, since the position of the sensor in the direction along the radial direction of the shaft portion is involved in the torsional component of the displacement generated in the cutting tool due to cutting, the value related to the torsional component is calculated by the above configuration. can do.

(5) Preferably, the position changing portion can change the position of the sensor along the axial direction of the shaft portion, and the position of the sensor is changed along the radial direction of the shaft portion. It is possible to do.

With such a configuration, it is possible to change the position of the sensor capable of measuring the acceleration generated in the cutting tool when cutting the object to be cut, and change the sensitivity of the measurement result of the sensor. This makes it possible to measure the acceleration and the like generated in the cutting tool while cutting the object to be cut. Further, the sensitivity of the measurement result of the sensor can be changed by changing the position of the sensor capable of measuring the centrifugal acceleration generated when the cutting tool rotates regardless of whether or not the object to be cut is being cut. .. This makes it possible to measure the centrifugal acceleration and the like generated in the cutting tool when the cutting tool rotates. Further, since the position of the sensor in the direction along the axial direction of the shaft portion is involved in the bending component of the displacement generated in the cutting tool due to cutting, the value related to the bending component is calculated by the above configuration. can do. Further, since the position of the sensor in the direction along the radial direction of the shaft portion is involved in the torsional component of the displacement generated in the cutting tool due to cutting, the value related to the torsional component is calculated by the above configuration. can do.

(6) Preferably, the cutting tool further includes a sensor attached to the shaft portion.

With such a configuration, it is possible to provide a cutting tool with a sensor capable of measuring the state of machining by the cutting tool under a wider variety of machining conditions.

(7) More preferably, the sensor is an acceleration sensor, and the measurement direction of the acceleration sensor is a direction along a plane having a rotation axis of the shaft portion as a normal line, and the acceleration sensor and the rotation thereof. Along the direction orthogonal to the straight line connecting the axes.

With such a configuration, it is possible to measure acceleration such as vibration caused by contact with an object to be cut.

More preferably, the cutting tool includes at least one of a strain sensor, a temperature sensor, and a sound sensor as the sensor.

With such a configuration, for example, at least one of an abnormal increase in strain generated in the shaft portion, frictional heat and abnormal noise when an abnormal vibration is generated in the shaft portion can be detected. ..

More preferably, the cutting tool further includes a wireless communication device, and the wireless communication device transmits sensor information indicating a measurement result of the sensor.

With such a configuration, for example, in the device on the receiving side, it is possible to perform processing such as abnormality detection using the measurement results of each sensor.

(10) Preferably, the shaft portion has a cylindrical shape, and the cutting tool is a rolling tool.

With such a configuration, the sensitivity of the sensor can be changed according to processing conditions such as the rotation speed of the shaft portion.

(11) The cutting system according to the embodiment of the present disclosure includes the cutting tool according to (9) above and a management device, and the management device provides sensor information indicating a measurement result of the sensor from the cutting tool. To receive.

In this way, the size of the measurement result such as acceleration can be changed by changing the position of the sensor due to the configuration in which the mounting position of the sensor on the shaft portion can be changed. Thereby, the sensitivity of the sensor can be easily changed according to the processing conditions. Therefore, it is possible to measure the state of machining with a cutting tool under a wider variety of machining conditions. Further, for example, in the management device, it is possible to perform processing such as abnormality detection using the measurement results of each sensor.

(12) The processing method according to the embodiment of the present disclosure is a processing method using a cutting tool, in which the cutting tool changes a shaft portion to which a sensor can be attached and a mounting position of the sensor on the shaft portion. The processing method includes a step of cutting an object to be cut by the cutting tool attached to the machine tool and accumulating the measurement result of the sensor, and the sensor by the position changing portion. The step of changing the mounting position of the sensor, the step of cutting the object to be cut by the cutting tool whose mounting position of the sensor has been changed, and the step of accumulating the measurement results of the sensor, and processing each of the accumulated measurement results. Including steps.

In this way, the size of the measurement result such as acceleration can be changed by changing the position of the sensor due to the configuration in which the mounting position of the sensor on the shaft portion can be changed. Thereby, the sensitivity of the sensor can be easily changed according to the processing conditions. Therefore, it is possible to measure the state of machining with a cutting tool under a wider variety of machining conditions. Further, based on the measurement results of the sensors at a plurality of positions, for example, among the displacements generated at each of the plurality of positions, the value relating to the component due to bending of the cutting tool, the value relating to the component due to twisting of the cutting tool, and cutting. A value related to the displacement component of the support member that supports the tool can be calculated. That is, it is possible to grasp the state of machining by the cutting tool and the state of the support member that supports the cutting tool.

(13) Preferably, in the step of processing each measurement result, the component corresponding to the machine tool is calculated from the measurement result.

With such a configuration, for example, it is possible to grasp the state of the support member that supports the cutting tool in the machine tool.

More preferably, the sensor is an acceleration sensor.

With such a configuration, based on the measurement results of the acceleration sensors at the plurality of positions, for example, the value related to the component of the acceleration due to the bending of the cutting tool among the accelerations generated at each of the plurality of positions, the twist of the cutting tool. It is possible to calculate the value related to the acceleration component of the cutting tool and the value related to the acceleration component of the support member that supports the cutting tool.

(15) The processing program according to the embodiment of the present disclosure is a processing program used in a management device that manages a cutting tool, and the cutting tool includes a shaft portion to which a sensor can be attached and the shaft portion on the shaft portion. It is equipped with a position changing part that can change the mounting position of the sensor, and the computer is cut by a pre-cutting tool mounted on the machine tool, and the mounting position of the sensor is changed by the position changing part. When the cutting tool whose mounting position of the sensor has been changed cuts the object to be cut, the storage processing unit that writes the measurement result of the sensor to the storage unit each time the cutting is performed, and the storage unit. This is a program for functioning as a control unit that processes each measurement result written by the processing unit.

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>
FIG. 1 is a side view showing a configuration of a cutting tool according to the first embodiment of the present disclosure.

The cutting tool 101 is, for example, a cutting tool used in a milling machine or the like, and specifically, for example, an end mill. The cutting tool 101 is used for cutting an object to be cut made of metal or the like. The cutting tool 101 is used in a state of being held by a tool holder 210 such as an arbor.

The tool holder 210 is attached to a columnar spindle 220 that gives a rotational force to the tool holder 210. The tool holder 210 is a columnar member arranged on an extension line of the spindle 220. Specifically, the upper end of the tool holder 210 is held by the spindle 220. Further, the lower end portion of the tool holder 210 holds the cutting tool 101.

With reference to FIG. 1, the cutting tool 101 includes a shaft portion 11, a blade mounting portion 12, a blade portion (not shown), an acceleration sensor 14, and a position changing portion 50. The upper portion of the shaft portion 11 constitutes a shank 111 and is held by the tool holder 210. The cutting tool 101 may be configured not to have a blade portion. Further, the blade portion may be integrally fixed to the blade mounting portion 12, or may be detachably attached to the blade mounting portion 12.

In the example shown in FIG. 1, the boundary between the shaft portion 11 and the blade mounting portion 12 is indicated by the alternate long and short dash line 41.

The shaft portion 11 has a rod shape having a circular or polygonal peripheral surface in a cross section perpendicular to the central axis 17 of the shaft portion 11, except for the enlarged diameter portion 15 described later. The base material of the shaft portion 11 is made of, for example, cemented carbide for cutting tools or steel for dies.

FIG. 2 is an arrow view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. In detail, FIG. 2 is an arrow view seen from the direction A in FIG. FIG. 3 is a diagram showing a configuration of a cutting tool according to the first embodiment of the present disclosure. In detail, FIG. 3 is an arrow view seen from the B direction in FIG.

With reference to FIG. 2, the acceleration sensor 14 is, for example, a so-called uniaxial acceleration sensor that measures acceleration in one direction. The measurement direction of the acceleration sensor 14 is, for example, the direction in which vibration is generated due to cutting by the cutting tool 101. That is, the acceleration sensor 14 can measure the acceleration of vibration accompanying cutting by the cutting tool 101. Specifically, the measurement direction 141 of the acceleration sensor 14 is a direction along a plane 18 whose normal line is the central axis 17 which is the rotation axis of the shaft portion 11, and connects the acceleration sensor 14 and the central axis 17. Along the direction orthogonal to the straight line 143.

The acceleration sensor 14 may measure the centrifugal acceleration. In this case, the measurement direction of the acceleration sensor 14 is, for example, along the direction connecting the central axis 17 of the shaft portion 11 and the acceleration sensor 14. Further, the acceleration sensor 14 may be, for example, a so-called three-axis acceleration sensor that measures acceleration in three directions. Further, instead of the acceleration sensor 14, another type of sensor may be attached to the shaft portion 11.

With reference to FIGS. 1 to 3, the shaft portion 11 has a larger diameter than the other portions of the shaft portion 11, and includes an enlarged diameter portion 15 to which the acceleration sensor 14 can be attached.

Specifically, the shaft portion 11 is a shaft in a radial direction Y, which is a direction orthogonal to the direction X, in a part of a region along the axial direction of the cutting tool 101, specifically, the longitudinal direction X. Includes a diameter-expanded portion 15 that enlarges the diameter of the portion 11.

Specifically, the diameter of the enlarged diameter portion 15 is larger than the diameter of the portion of the shaft portion 11 other than the enlarged diameter portion 15. In other words, the diameter-expanded portion 15 is thicker than the portion of the shaft portion 11 other than the diameter-expanded portion 15. When the portion of the shaft portion 11 other than the enlarged diameter portion 15 has a polygonal peripheral surface, the diameter of the portion of the shaft portion 11 other than the enlarged diameter portion 15 passes through the central axis 17 in the direction of the central axis 17. , The largest line segment having both ends on the peripheral surface of the portion of the shaft portion 11 other than the enlarged diameter portion 15.

The direction X of the cutting tool 101 is along the central axis 17 of the shaft portion 11. For example, the direction X of the cutting tool 101 and the central axis 17 of the shaft portion 11 are parallel to each other.

The enlarged diameter portion 15 is formed in a columnar shape. In the examples shown in FIGS. 1 to 3, the enlarged diameter portion 15 has a shape in which a part of the cylinder is removed. In the present specification, not only a cylinder but also a shape in which a part of the cylinder is removed is referred to as a cylinder. Specifically, the enlarged diameter portion 15 has a surface 55 parallel to and flat with respect to the central axis 17 of the shaft portion 11 in the cylinder. The enlarged diameter portion 15 has a shape in which the portion opposite to the central axis 17 with respect to the surface 55 is removed from the cylinder. The diameter of the enlarged diameter portion 15 is the largest of the line segments that pass through the central axis 17 and have both ends on the peripheral surface of the enlarged diameter portion 15 in the direction of the central axis 17. In the examples shown in FIGS. 1 to 3, the diameter of the enlarged diameter portion 15 corresponds to the diameter of the cylinder before a part of the cylinder is removed.

Further, the diameter-expanded portion 15 has a recess 16 that is open at a part of the surface 55 and is recessed on the central axis 17 side. The recess 16 is open in a rectangular shape. The bottom surface 161 of the recess 16 is a flat surface parallel to the surface 55. The bottom surface 161 is formed in a rectangular shape so as to extend along the central axis 17. A plurality of screw holes 57 are formed on the surface 55.

In the examples shown in FIGS. 1 to 3, the enlarged diameter portion 15 has one surface 55, but the diameter is not limited to this. For example, the diameter-expanded portion 15 may have two surfaces 55 located on opposite sides of the central axis 17. With such a configuration, the balance of the enlarged diameter portion 15 is improved, so that it is possible to prevent abnormal vibration from being generated when the cutting tool 101 is rotated.

The position changing unit 50 changes the position of the acceleration sensor 14 in a state where the acceleration sensor 14 is attached to the shaft unit 11.

Specifically, for example, the position changing portion 50 can change the position of the acceleration sensor 14 in the axial direction of the shaft portion 11, that is, in the direction along the central axis 17.

In the examples shown in FIGS. 1 to 3, the first sensor position A1, the second sensor position A2, the third sensor position A3, and the fourth sensor position A4 arranged along the direction X refer to the acceleration sensor 14. There are four positions that can be attached. The first sensor position A1, the second sensor position A2, the third sensor position A3, and the fourth sensor position A4 are arranged in this order from the side closer to the blade mounting portion 12 to the side farther from it.

The position changing unit 50 is configured so that the position of the acceleration sensor 14 can be changed in the range from the first sensor position A1 to the fourth sensor position A4.

Specifically, the position changing portion 50 includes a pedestal portion 51 that supports the acceleration sensor 14, a plurality of screw holes 53 formed on the bottom surface 161 of the recess 16, and a plurality of male screw members 54 that are screwed into the screw holes 53. And include. The number of screw holes 53 is, for example, 10, and the number of male screw members 54 is 4.

The pedestal portion 51 is a plate-shaped member. The pedestal portion 51 is formed with a plurality of through holes (not shown) through which the legs of the male screw member 54 can be inserted. For example, four through holes are formed in the pedestal portion 51.

Four screw holes 53 are formed in each of the two rows along the direction X. In each row, the first screw hole 53 and the second screw hole 53 from the side closer to the blade mounting portion 12 are used to mount the acceleration sensor 14 at the first sensor position A1.

Further, in each row, the second screw hole 53 and the third screw hole 53 from the side closer to the blade mounting portion 12 are used to mount the acceleration sensor 14 at the second sensor position A2.

Further, in each row, the third screw hole 53 and the fourth screw hole 53 from the side closer to the blade mounting portion 12 are used to mount the acceleration sensor 14 at the third sensor position A3.

Further, in each row, the fourth screw hole 53 and the fifth screw hole 53 from the side closer to the blade mounting portion 12 are used to mount the acceleration sensor 14 at the fourth sensor position A4.

For example, when the acceleration sensor 14 is mounted at the first sensor position A1, the first screw hole 53 and the second screw hole 53 from the side closer to the blade mounting portion 12 in each row along the direction X The acceleration sensor 14 is attached to the first sensor position A1 by screwing the four male screw members 54 and the four screw holes 53 in a state where the four through holes of the pedestal portion 51 are aligned.

Then, when the mounting position of the acceleration sensor 14 is moved from the first sensor position A1 to the second sensor position A2, the four male screw members 54 and the four screw holes 53 in each row along the direction X After releasing the screwing with, 4 in a state where the four through holes of the pedestal portion 51 are aligned with the second screw hole 53 and the third screw hole 53 from the side closer to the blade mounting portion 12. The accelerometer 14 is attached to the second sensor position A2 by screwing the one male screw member 54 and the four screw holes 53.

The position changing unit 50 can change the position of the acceleration sensor 14 in the radial direction of the shaft unit 11, for example.

FIG. 4 is a side view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. More specifically, FIG. 4 is a diagram showing that the position changing portion 50 can change the position of the acceleration sensor 14 in the radial direction of the shaft portion 11.

FIG. 5 is an arrow view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. In detail, FIG. 5 is an arrow view seen from the direction A in FIG. FIG. 6 is an arrow view showing the configuration of the cutting tool according to the first embodiment of the present disclosure. In detail, FIG. 6 is an arrow view seen from the B direction in FIG.

With reference to FIGS. 4 to 6, the position changing portion 50 further includes a position changing plate 56 and a male screw member 58. The position change plate 56 is fixed to the surface 55 of the diameter-expanded portion 15 shown in FIG. By fixing the position change plate 56 to the surface 55, the recess 16 of the enlarged diameter portion 15 is closed.

The position changing plate 56 shown in FIGS. 4 to 6 is, for example, a plate-shaped member formed in a rectangular shape. The position changing plate 56 has a size matching the size of the surface 55 of the enlarged diameter portion 15 shown in FIG. 1 and has a predetermined thickness.

In the examples shown in FIGS. 4 to 6, the fifth sensor position A5, the sixth sensor position A6, the seventh sensor position A7, and the eighth sensor position A8 arranged along the direction X are the position change plates 56. There are four new mounting positions of the acceleration sensor 14 in the region opposite to the enlarged diameter portion 15. The fifth sensor position A5, the sixth sensor position A6, the seventh sensor position A7, and the eighth sensor position A8 are arranged in this order from the side closer to the blade mounting portion 12 to the side farther from it.

The position change plate 56 is formed with a plurality of through holes (not shown) formed at positions corresponding to the plurality of screw holes 57 formed on the surface 55 shown in FIG. In the example shown in FIG. 4, the number of the through holes is four. The through hole is formed so that the leg portion of the male screw member 58 can be inserted.

The male screw member 58 is screwed with the screw hole 57. In the example shown in FIG. 4, the number of male screw members 58 is four.

Further, a plurality of screw holes 60 are formed in the position change plate 56. The male screw member 54 is screwed into the screw hole 60. The number of screw holes 60 is, for example, 10.

The screw holes 60 are arranged in two rows along the direction X. Five screw holes 60 are formed in each row. In each row, the first screw hole 60 and the second screw hole 60 from the side closer to the blade mounting portion 12 are used to mount the acceleration sensor 14 at the fifth sensor position A5.

Further, in each row, the second screw hole 60 and the third screw hole 60 from the side closer to the blade mounting portion 12 are used to mount the acceleration sensor 14 at the sixth sensor position A6.

Further, in each row, the third screw hole 60 and the fourth screw hole 60 from the side closer to the blade mounting portion 12 are used to mount the acceleration sensor 14 at the seventh sensor position A7.

Further, in each row, the fourth screw hole 60 and the fifth screw hole 60 from the side closer to the blade mounting portion 12 are used to mount the acceleration sensor 14 at the eighth sensor position A8.

For example, when moving the installation position of the acceleration sensor 14 from the first sensor position A1 to the fifth sensor position A5, first, four male screw members 54 and four screws in each row along the direction X Unscrew with the hole 53.

Next, the position change plate 56 is arranged on the surface 55 of the enlarged diameter portion 15. Next, in a state where the four screw holes 57 formed on the surface 55 and the through holes (not shown) of the position changing plate 56 are aligned, each screw hole 57 and the male screw member 58 are screwed to form a surface. The position change plate 56 is fixed to 55.

Next, the pedestal portion 51 is placed on the position change plate 56. Next, in a state where the four through holes of the pedestal portion 51 are aligned, the four

male screw members

54 and 4 are inserted into the first screw hole 60 and the second screw hole 60 from the side closer to the blade mounting portion 12. By screwing the two screw holes 60, the acceleration sensor 14 is attached to the fifth sensor position A6.

Further, when the installation position of the acceleration sensor 14 is moved from the fifth sensor position A5 to the sixth sensor position A6, the four male screw members 54 and the four screw holes 60 in each row along the direction X Unscrew with.

Next, in a state where the four through holes of the pedestal portion 51 are aligned with the second screw hole 60 and the third screw hole 60 from the side closer to the blade mounting portion 12, the four

male screw members

54 and 4 By screwing the two screw holes 60, the acceleration sensor 14 is attached to the sixth sensor position A6.

FIG. 7 is a side view schematically showing a cutting tool according to the first embodiment of the present disclosure. Specifically, FIG. 7 is a schematic side view of the cutting tool when the cutting tool 101 shown in FIG. 1 is regarded as a cantilever.

With reference to FIG. 7, it is assumed that a load, that is, a cutting resistance F is applied to the blade mounting portion 12 or the blade portion located at the end of the cutting tool 101.

FIG. 8 is a graph showing the result of simulating the cutting tool according to the first embodiment of the present disclosure. Specifically, FIG. 8 is a graph showing the results of simulating the cutting tool shown in FIG. 7.

The horizontal axis and the vertical axis in FIG. 8 indicate the distance from the cutting tool 101, that is, the fulcrum of the cantilever, and the amount of displacement, respectively.

That is, FIG. 8 shows the degree of deformation of the cutting tool 101 when the cutting resistance F is applied to the blade mounting portion 12 or the blade portion of the cutting tool 101 shown in FIG. 7.

From the simulation results shown in FIG. 8, it can be seen that the closer to the blade mounting portion 12 or the blade portion of the cutting tool 101, the larger the displacement amount of the cutting tool 101. Therefore, when the acceleration sensor 14 is attached to the cutting tool 101, the closer the attachment position of the acceleration sensor 14 is to the blade attachment portion 12 or the blade portion, the higher the sensitivity of the acceleration sensor 14.

From the above, when measuring the acceleration under a machining condition with a large load, the acceleration sensor 14 is attached to the fulcrum, that is, the root of the cutting tool 101, while the acceleration is measured under a machining condition with a small load. Attaches the accelerometer 14 at a position near the end of the cutting tool 101. As a result, when the load is large, the sensitivity of the acceleration sensor 14 can be intentionally lowered, and when the load is small, the sensitivity of the acceleration sensor 14 can be intentionally increased.

Therefore, by changing the position of the acceleration sensor 14 according to the degree of the load applied to the cutting tool 101, the acceleration can be measured under various machining conditions.

FIG. 9 is a diagram showing a configuration of a cutting system according to the first embodiment of the present disclosure. More specifically, FIG. 9 is a diagram showing a state in which the cutting tool is further equipped with a battery and a wireless communication device in addition to the components shown in FIG. In FIG. 9, the battery and the wireless communication device are shown by an alternate long and short dash line, which is an imaginary line.

With reference to FIG. 9, the cutting tool 101 further includes a battery 22, a wireless communication device 23, and a housing 24, in addition to the configuration shown in FIG.

The battery 22 is connected to the acceleration sensor 14 and the wireless communication device 23 via a power line (not shown). The battery 22 supplies electric power to the acceleration sensor 14 and the wireless communication device 23 via the power line. The power line is provided with a switch for switching the power supply on and off.

The wireless communication device 23 is connected to the acceleration sensor 14 via a signal line (not shown). The acceleration sensor 14 outputs a measurement signal indicating the acceleration generated in the shaft portion 11 to the wireless communication device 23 via a signal line.

When the wireless communication device 23 receives the measurement signal from the acceleration sensor 14, the wireless communication device 23 includes the measurement result indicated by the received measurement signal in the wireless signal and transmits the measurement result to an external management device 301 such as a personal computer. The management device 301, for example, accumulates the received measurement results and processes the accumulated measurement results. Specifically, for example, the management device 301 analyzes the measurement result indicated by the received sensor information.

Further, the wireless communication device 23 does not show the positional relationship between the acceleration sensor 14 and the blade mounting portion 12 or the blade portion, that is, the first position information indicating the positional relationship between the measurement position and the cutting position in the cutting tool 101. It is acquired from the storage unit and transmitted to the management device 301.

The cutting tool 101 further includes an operation input unit (not shown). The operation input unit is configured so that the user can input the mounting position of the acceleration sensor 14. Specifically, for example, the operation input unit is an operation button that allows the user to select the sensor position to which the acceleration sensor 14 is attached from the sensor positions A1 to A8.

The first position information corresponds to the mounting position of the acceleration sensor 14 input in the operation input unit.

The management device 301, for example, accumulates the received first position information and analyzes the accumulated first position information.

The positional relationship indicated by the first position information is, for example, the distance between the measurement position and the cutting position. The first position information is not limited to this, and includes the distance between the measurement position and the cutting position, the direction of the cutting position with respect to the measurement position, or the direction of the measurement position with respect to the cutting position. May be shown.

Further, the wireless communication device 23 provides the second position information indicating the positional relationship between the acceleration sensor 14 and the central axis 17 of the shaft portion 11, that is, the positional relationship between the measurement position on the cutting tool 101 and the central axis 17. It is acquired from the storage unit and transmitted to the management device 301. The second position information corresponds to the mounting position of the acceleration sensor 14 input in the operation input unit.

The management device 301 accumulates the received second position information, and analyzes the accumulated second position information, for example.

The positional relationship indicated by the second position information is, for example, the distance between the measurement position and the central axis 17. The second position information is not limited to this, and includes the distance between the measurement position and the central axis 17, and the direction of the cutting position with respect to the central axis 17 or the direction of the central axis 17 with respect to the cutting position. May be shown.

The housing 24 accommodates the accelerometer 14, the battery 22, the wireless communication device 23, the power line and the signal line, specifically, the accelerometer 14 and the like are covered from below and from the sides of the accelerometer 22 and the housing 24. Holds the wireless communication device 23.

FIG. 10 is a diagram showing a configuration of a management device in the cutting system according to the first embodiment of the present disclosure.

With reference to FIGS. 9 and 10, the cutting system 201 includes a machine tool 202 such as a milling machine and a management device 301.

The machine tool 202 controls a cutting tool 101, a tool holder 210 for holding the cutting tool 101, a spindle 220 for holding the tool holder 210, a drive unit (not shown) for applying a rotational force to the spindle 220, and the drive unit. It includes a control unit (not shown). The drive unit is a motor or the like that drives the cutting tool 101 via the spindle 220 and the tool holder 210. The control unit controls the rotation speed of the drive unit and the like.

The cutting tool 101 transmits a wireless signal including sensor information indicating the measurement result of the acceleration sensor 14.

The management device 301 receives a wireless signal including sensor information from the cutting tool 101, and processes the measurement result indicated by the received sensor information.

Specifically, the management device 301 includes a wireless communication unit 31, a control unit 32, a display unit 33, a storage unit 35, and an operation input unit 36.

The wireless communication unit 31 wirelessly communicates with the wireless communication device 23 of the cutting tool 101. Specifically, the wireless communication unit 31 receives a wireless signal including sensor information from the wireless communication device 23 of the cutting tool 101, and stores the measurement result indicated by the sensor information included in the wireless signal in the storage unit 35. To do.

The operation input unit 36 includes a user interface such as a keyboard and a mouse. The operation input unit 36 receives instructions and data input from the user.

The storage unit 35 includes, for example, a storage device such as an HDD (Hard Disk Drive). Further, for example, the storage unit 35 may be a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versailles Disc Read Only Memory), or a BD-ROM (Blu-ray (registered trademark) Disc Read Memory). Includes auxiliary storage. Further, for example, the storage unit 35 includes a semiconductor memory such as a RAM (Random Access Memory) and a ROM (Read Only Memory).

The storage unit 35 stores programs and data for operating the control unit 32, measurement results received by the wireless communication unit 31 from the cutting tool 101, analysis results of the control unit 32, and the like. The storage unit 35 may be provided outside the management device 301.

The control unit 32 includes, for example, a CPU (Central Processing Unit). The control unit 32 analyzes the measurement result of the acceleration sensor 14 written (accumulated) in the storage unit 35, and stores the analysis result in the storage unit 35. Further, the control unit 32 controls each unit such as the wireless communication unit 31 and the display unit 33 in the management device 301.

The display unit 33 is, for example, a display. The display unit 33 displays the analysis result of the control unit 32 written in the storage unit 35. The display unit 33 may be provided outside the management device 301.

Further, when it is difficult for the cutting system 201 to directly transmit and receive a wireless signal between the machine tool 202 and the management device 301 due to a long distance or the like, the cutting system 201 is a relay device between the two. May be provided. In this case, the machine tool 202 transmits a wireless signal to the management device 301 via the relay device.

[how to use]
A method of using the cutting tool 101 will be described with reference to FIGS. 9 and 10.

First, the user fixes the shaft portion 11 of the cutting tool 101 to, for example, the tool holder in the machine tool 202.

Next, power is supplied from the battery 22 to the acceleration sensor 14 and the wireless communication device 23 by switching the switch provided on the power line from off to on.

Next, the cutting tool 101 is rotationally driven to cut the object to be cut, so that the shaft portion 11 is accelerated by the cutting.

The acceleration sensor 14 outputs a measurement signal indicating the acceleration generated in the shaft portion 11 to the wireless communication device 23.

Next, the wireless communication device 23 includes the measurement result indicated by the measurement signal received from the acceleration sensor 14 and the position information of the acceleration sensor 14 in the wireless signal and transmits the measurement result to the external management device 301.

In the management device 301, the wireless communication unit 31 receives a wireless signal including sensor information indicating the measurement result of the acceleration sensor 14 from the wireless communication device 23, and stores the received sensor information in the storage unit 35.

The control unit 32 analyzes the measurement result stored in the storage unit 35 in response to an instruction input from the user via the operation input unit 36.

11 to 14 are diagrams showing an example of analysis results in the management device in the cutting system according to the first embodiment of the present disclosure. Specifically, FIGS. 11 to 14 are graphs showing an example of the acceleration generated in the cutting tool 101 due to the cutting of the object to be cut by the cutting tool 101.

11 to 14 show the acceleration generated when cutting is performed by the cutting tool 101 in a state where the acceleration sensor 14 is attached to the sensor positions A4, A3, A2, and A1 shown in FIG. 9, respectively.

That is, FIG. 11 shows the acceleration generated when the acceleration sensor 14 is attached to the sensor position A4, FIG. 12 shows the acceleration generated when the acceleration sensor 14 is attached to the sensor position A3, and FIG. 13 shows the acceleration sensor 14 as a sensor. The acceleration generated when the acceleration sensor 14 is attached to the position A2 is shown, and FIG. 14 shows the acceleration generated when the acceleration sensor 14 is attached to the sensor position A1. In FIGS. 11 to 14, the machining conditions are the same, and for example, the cutting resistance F is the same.

It is assumed that four blades (not shown) are provided at the end of the shaft portion 11 along the circumferential direction of the shaft portion 11 at a distance of 90 ° from each other. The circumferential direction of the shaft portion 11 means a direction along the peripheral surface of the projected shaft portion 11 when the shaft portion 11 is projected on a plane having the central axis 17 of the shaft portion 11 as a normal.

In FIGS. 11 to 14, the horizontal axis is the acceleration generated in the direction Y1 orthogonal to the central axis 17 of the shaft portion 11, and the vertical axis is the direction along the plane orthogonal to the shaft portion 11. The acceleration generated in the direction Y2 orthogonal to Y1 is shown.

11 to 14 show the acceleration generated by each blade cutting the object to be cut. As can be seen from FIGS. 11 to 14, in FIGS. 11 to 14, the measured accelerations increase in this order.

That is, it can be seen that the closer the position of the acceleration sensor 14 is to the blade mounting portion 12 or the blade portion of the cutting tool 101, the greater the acceleration measured by the cutting tool 101. Therefore, it was confirmed that the closer the mounting position of the acceleration sensor 14 in the cutting tool 101 is to the blade mounting portion 12 or the blade portion, the higher the sensitivity of the acceleration sensor.

Further, when the centrifugal acceleration is measured by the acceleration sensor 14, the acceleration sensor 14 has a diameter-expanded portion 15 so that the measurement direction is along the direction connecting the central axis 17 of the shaft portion 11 and the acceleration sensor 14. It is attached.

Centrifugal acceleration a [mm / s ^ 2] is expressed by the following equation (1).

A = r x ω ^ 2 ... (1)

In equation (1), r is the distance [mm] between the central axis 17 of the shaft portion 11 and the acceleration sensor 14, and ω is the angular velocity [rad / s] of the shaft portion 11. The operator "^" represents a power.

That is, the centrifugal acceleration a increases as the distance r increases. Therefore, the farther the mounting position of the acceleration sensor 14 is from the central axis 17 of the shaft portion 11, the higher the sensitivity of the acceleration sensor 14.

From the above, when measuring centrifugal acceleration under machining conditions where the rotation speed of the shaft portion 11 is high, the acceleration sensor 14 is attached at a position close to the central axis 17 of the shaft portion 11, while the rotation of the shaft portion 11 When measuring centrifugal acceleration under low-speed machining conditions, the acceleration sensor 14 is attached at a position far from the central axis 17 of the shaft portion 11. Thereby, in the former case, the sensitivity of the acceleration sensor 14 can be intentionally lowered, and in the latter case, the sensitivity of the acceleration sensor 14 can be intentionally increased.

Specifically, when measuring centrifugal acceleration under processing conditions where the rotation speed of the shaft portion 11 is high, the acceleration sensor 14 is attached to the bottom surface 161 of the recess 16 in the diameter-expanded portion 15. For example, the acceleration sensor 14 is mounted at any of the sensor mounting positions (hereinafter, also referred to as sensor positions) A1 to A4.

On the other hand, when measuring the centrifugal acceleration under the machining condition where the rotation speed of the shaft portion 11 is small, the acceleration sensor 14 is attached to the position changing plate 56 in a state where the position changing plate 56 is attached to the diameter expanding portion 15. Be done. For example, the acceleration sensor 14 is attached to any of the sensor positions A5 to A8.

Therefore, by changing the position of the acceleration sensor 14 according to the rotation speed of the cutting tool 101, the centrifugal acceleration can be measured under various machining conditions.

The cutting tool 101 may have a configuration in which the enlarged diameter portion 15 is not formed on the shaft portion 11. In this case, a recess 16 is formed in the shaft portion 11 whose diameter has not been expanded, and the acceleration sensor 14 is attached to the recess 16.

Further, the acceleration sensor 14 may be attached to the shaft portion 11 by a fixing member other than the screw member.

Further, the cutting tool 101 may not be provided with a sensor such as an acceleration sensor 14, and the shaft portion 11 may have a structure in which the sensor can be attached and detached.

Further, the cutting tool 101 does not have to be a turning tool such as an end mill, and may be, for example, a turning tool such as a tool bit.

Further, the position changing portion 50 may have a configuration in which the position of the acceleration sensor 14 can be changed in either the axial direction or the radial direction of the shaft portion 11.

Further, the position changing portion 50 may have a configuration having a slide mechanism (not shown) capable of sliding the pedestal portion 51 in the direction X. Specifically, for example, a rail or a groove portion (not shown) capable of sliding the pedestal portion 51 along the X direction is formed on the bottom surface 161 of the recess 16 and the position changing plate 56 in the shaft portion 11.

In this case, the pedestal portion 51 can slide and move along the rail or the groove portion. The slid-moved pedestal portion 51 is fixed to the shaft portion 11 by, for example, a fixing member such as a screw member.

Further, the cutting tool 101 may be configured not to include the wireless communication device 23. In this case, for example, the cutting tool 101 stores sensor information and the like in a storage unit (not shown). Then, for example, the user performs an operation of storing the sensor information or the like stored in the storage unit in the storage unit 35 of the management device 301.

Further, the position changing unit 50 may be configured to change the position of the acceleration sensor 14 by, for example, a drive mechanism (not shown) such as a ball screw. In this case, for example, the screw shaft of the ball screw is arranged along the X direction of the shaft portion 11, and the acceleration sensor 14 is attached to the nut portion of the ball screw.

Further, in this case, for example, a control unit (not shown) that controls a motor that rotationally drives the screw shaft of the ball screw may be configured to control the movement of the acceleration sensor 14. Further, the instruction signal to the motor may be given from the outside of the cutting tool 101.

FIG. 15 is a diagram showing another example of the configuration of the cutting tool according to the first embodiment of the present disclosure.

The number of the position changing plates 56 attached to the surface 55 of the enlarged diameter portion 15 is not limited to one, and may be a plurality. In this case, the plurality of position changing plates 56 are attached to the surface 55 of the enlarged diameter portion 15 in a state where the position changing plates 56 are laminated. The acceleration sensor 14 is attached to the position changing plate 56 located at the position farthest from the central axis 17 of the shaft portion 11.

Since each position changing plate 56 has a predetermined thickness, the distance between the acceleration sensor 14 and the central axis 17 of the shaft portion 11 can be changed by changing the number of stacked sheets.

16 to 20 are cross-sectional views schematically showing another example of the cutting tool according to the first embodiment of the present disclosure. Specifically, FIGS. 16 to 20 are cross-sectional views schematically showing another example of the position of the sensor in the cutting tool.

In FIGS. 16 to 20, three positions of one sensor are shown for easy understanding. Specifically, in FIGS. 16 to 20, the sensor before the position change is shown by a solid line, and the sensor after the position change is shown by a two-dot chain line. Further, in FIGS. 16 to 20, hatching showing a cross section is not shown for simplification of illustration.

FIG. 16 shows the sensor position B1, the sensor position B2, and the sensor position B3 on the shaft portion 11.

With reference to FIG. 16, the position changing unit 50 changes the position of the acceleration sensor 14 between the sensor positions B1 to B3.

The sensor position B2 is deviated from the sensor position B1 in the X direction and is deviated in the radial direction Y of the shaft portion 11. The sensor position B3 is deviated from the sensor position B1 in the X direction and is not deviated in the radial direction Y. The sensor position B3 is deviated from the sensor position B2 in the X direction and is deviated in the radial direction Y.

FIG. 17 shows the sensor position B1, the sensor position B3, and the sensor position B4 on the shaft portion 11.

With reference to FIG. 17, the position changing unit 50 changes the position of the acceleration sensor 14 between the sensor positions B1, B3 and B4.

The sensor position B4 is not deviated from the sensor position B1 in the X direction and is deviated in the radial direction Y. The sensor position B4 is deviated from the sensor position B3 in the X direction and is deviated in the radial direction Y.

FIG. 18 shows the sensor position B1, the sensor position B5, and the sensor position B6 on the shaft portion 11.

With reference to FIG. 18, the position changing unit 50 changes the position of the acceleration sensor 14 between the sensor positions B1, B5 and B6.

The sensor position B5 is deviated from the sensor position B1 in the X direction and is deviated in the radial direction. The sensor position B6 is deviated from the sensor position B1 in the X direction and is deviated in the radial direction. The sensor position B6 is deviated from the sensor position B5 in the X direction and is deviated in the radial direction.

FIG. 19 shows the sensor position B1, the sensor position B7, and the sensor position B8 on the shaft portion 11.

With reference to FIG. 19, the position changing unit 50 changes the position of the acceleration sensor 14 between the sensor positions B1, B7, and B8.

The sensor position B7 is not deviated from the sensor position B1 in the X direction and is deviated in the radial direction. The sensor position B8 is not deviated from the sensor position B1 in the X direction and is deviated in the radial direction. The sensor position B8 is not deviated from the sensor position B7 in the X direction and is deviated in the radial direction.

FIG. 20 shows the sensor position B1, the sensor position B3, and the sensor position B9 on the shaft portion 11.

With reference to FIG. 20, the position changing unit 50 changes the position of the acceleration sensor 14 between the sensor positions B1, B3 and B9.

The sensor position B9 is deviated from the sensor position B1 in the X direction and is not deviated in the radial direction. The sensor position B9 is deviated from the sensor position B3 in the X direction and is not deviated in the radial direction Y.

As shown in FIGS. 16 to 18, the position changing unit 50 can change the position of the acceleration sensor 14 along the X direction, and changes the position of the acceleration sensor 14 along the radial direction Y. It may be possible to change the position of the acceleration sensor 14 in either the X direction or the radial direction Y, as shown in FIGS. 19 and 20.

[Modification 1]
FIG. 21 is a diagram showing a modified example 1 of the cutting system according to the first embodiment of the present disclosure.

With reference to FIG. 21, the cutting system 203 according to the first modification includes a machine tool 204 instead of the machine tool 202 shown in FIG. The machine tool 204 includes a cutting tool 102 instead of the cutting tool 101 shown in FIG. The cutting tool 102 has a strain sensor 19 instead of the acceleration sensor 14 shown in FIG.

The position changing portion 50 can change the mounting position of the strain sensor 19 on the shaft portion 11.

Specifically, for example, the position changing portion 50 can change the position of the strain sensor 19 in the axial direction of the shaft portion 11, that is, in the direction along the central axis 17.

Further, the position changing portion 50 can change the position of the strain sensor 19 in a direction along the radial direction of the shaft portion 11, for example.

The method of changing the position of the strain sensor 19 by the position changing unit 50 is the same as the method of changing the position of the acceleration sensor 14 in the cutting system 201 shown in FIG.

The cutting tool 102 transmits a radio signal including sensor information indicating the measurement result of the strain sensor 19.

The management device 301 receives a wireless signal including sensor information from the cutting tool 101, and processes the measurement result indicated by the received sensor information. Specifically, for example, the management device 301 analyzes the measurement result indicated by the received sensor information.

FIG. 22 is a side view schematically showing a cutting tool according to a modification 1 of the first embodiment of the present disclosure. Specifically, FIG. 22 is a schematic side view of the cutting tool when the cutting tool 102 shown in FIG. 21 is regarded as a cantilever.

With reference to FIG. 22, it is assumed that a load, that is, a cutting resistance F is applied to the blade mounting portion 12 or the blade portion located at the end of the cutting tool 102.

FIG. 23 is a graph showing the result of simulating the cutting tool in the first modification of the first embodiment of the present disclosure. Specifically, FIG. 23 is a graph showing the results of simulating the cutting tool shown in FIG. 21.

The horizontal axis and the vertical axis in FIG. 23 show the distance from the fulcrum of the cantilever and the strain when the cutting tool 102 is regarded as the cantilever, respectively.

From the simulation results shown in FIG. 23, it can be seen that the closer to the fulcrum of the cutting tool 102, in other words, the farther from the blade mounting portion 12 or the blade portion, the greater the distortion of the cutting tool 102. Therefore, the closer the mounting position of the strain sensor 19 on the cutting tool 102 is to the fulcrum of the cutting tool 102, the higher the sensitivity of the strain sensor 19.

From the above, when measuring the strain under a machining condition with a large load, the strain sensor 19 is attached at a position close to the end of the cutting tool 102, while the strain is measured under a machining condition with a small load. The strain sensor 19 is attached to the fulcrum of the cutting tool 102, that is, at a position close to the root portion. As a result, when the load is large, the sensitivity of the acceleration sensor can be intentionally lowered, and when the load is small, the sensitivity of the acceleration sensor can be intentionally increased.

Therefore, by changing the position of the strain sensor 19 according to the degree of the load applied to the cutting tool 102, the strain can be measured under various machining conditions.

Other configurations are the same as the cutting system 201 described above, so detailed description will not be repeated here.

[Modification 2]
FIG. 24 is a diagram showing a cutting system according to a second modification of the first embodiment of the present disclosure.

With reference to FIG. 24, the cutting system 205 according to the second modification includes a machine tool 206 instead of the machine tool 202 shown in FIG. The machine tool 206 includes a cutting tool 103 instead of the cutting tool 101 shown in FIG. The cutting tool 103 further includes a temperature sensor 26 and a sound sensor 27 in addition to the acceleration sensor 14 shown in FIG.

In the example shown in FIG. 24, the temperature sensor 26 and the sound sensor 27 are supported by a pedestal portion 51 provided separately from the pedestal portion 51 that supports the acceleration sensor 14. The pedestal portion 51 that supports the temperature sensor 26 and the sound sensor 27 is attached at a position different from that of the pedestal portion 51 that supports the acceleration sensor 14. For example, the pedestal portion 51 that supports the temperature sensor 26 and the sound sensor 27 is attached to the third sensor position A3 by the male screw member 54.

The position changing unit 50 can change the mounting positions of the acceleration sensor 14, the temperature sensor 26, and the sound sensor 27 on the shaft unit 11.

Specifically, for example, the position changing unit 50 can change the positions of the acceleration sensor 14, the temperature sensor 26, and the sound sensor 27 in the axial direction of the shaft unit 11, that is, in the direction along the central axis 17. is there.

Further, the position changing unit 50 can change the positions of the acceleration sensor 14, the temperature sensor 26, and the sound sensor 27 in the direction along the radial direction of the shaft unit 11, for example.

The cutting tool 103 transmits a radio signal including sensor information indicating the measurement results of the acceleration sensor 14, the temperature sensor 26, and the sound sensor 27.

The management device 301 receives a wireless signal including sensor information from the cutting tool 101, and processes each measurement result indicated by the received sensor information. Specifically, for example, the management device 301 analyzes each measurement result indicated by the received sensor information.

The cutting tool 103 may be configured not to include either the temperature sensor 26 or the sound sensor 27.

By the way, by attaching a sensor to the cutting tool, it is possible to measure a physical quantity that indicates the state of machining by the cutting tool. An excellent technique using such measurement is desired.

On the other hand, the cutting tool according to the first embodiment of the present disclosure includes a shaft portion 11 to which a sensor can be attached and a position changing portion 50 to which the attachment position of the sensor on the shaft portion 11 can be changed.

In this way, the size of the acceleration measurement result can be changed by changing the position of the sensor due to the configuration in which the mounting position of the sensor on the shaft portion 11 can be changed. Thereby, the sensitivity of the sensor can be easily changed according to the processing conditions.

Therefore, the cutting tool according to the first embodiment of the present disclosure can measure the state of the cutting tool 101 under a wider variety of machining conditions.

Further, in the cutting tool according to the first embodiment of the present disclosure, the shaft portion 11 has a cylindrical shape, and the cutting tool 101 is a rolling tool.

With such a configuration, the sensitivity of the acceleration sensor 14 can be changed according to processing conditions such as the rotation speed of the shaft portion 11.

Further, in the cutting tool according to the first embodiment of the present disclosure, the position changing portion 50 can change the position of the sensor along the axial direction of the shaft portion 11.

With such a configuration, the position of the sensor capable of measuring the acceleration generated in the cutting tool 101 when cutting the object to be cut can be changed, and the sensitivity of the measurement result of the sensor can be changed. Therefore, it is possible to measure the acceleration and the like generated in the cutting tool 101 while cutting the object to be cut. Further, since the position of the sensor in the direction along the axial direction of the shaft portion 11 is involved in the bending component of the displacement generated in the cutting tool 101 due to cutting, the bending component is formed by such a configuration. You can calculate the value for.

Further, in the cutting tool according to the first embodiment of the present disclosure, the position changing portion 50 can change the position of the sensor along the radial direction of the shaft portion 11.

With such a configuration, the position of the sensor capable of measuring the centrifugal acceleration generated when the cutting tool 101 rotates regardless of whether or not the object to be cut is being cut is changed, and the sensitivity of the measurement result of the sensor is changed. can do. Therefore, the centrifugal acceleration generated in the cutting tool 101 when the cutting tool 101 is rotated can be measured. Further, since the position of the sensor in the radial direction of the shaft portion 11 is involved in the torsional component of the displacement generated in the cutting tool 101 due to cutting, the torsional component is formed by such a configuration. You can calculate the value for.

Further, in the cutting tool according to the first embodiment of the present disclosure, the position changing portion 50 can change the position of the sensor along the axial direction of the shaft portion 11, and the diameter of the shaft portion 11 It is possible to change the position of the sensor along the direction.

With such a configuration, it is possible to change the position of the sensor capable of measuring the acceleration generated in the cutting tool 101 when cutting the object to be cut, and change the sensitivity of the measurement result of the sensor. This makes it possible to measure the acceleration and the like generated in the cutting tool 101 while cutting the object to be cut. Further, the sensitivity of the measurement result of the sensor can be changed by changing the position of the sensor capable of measuring the centrifugal acceleration generated when the cutting tool 101 rotates regardless of whether or not the object to be cut is being cut. it can. As a result, it is possible to measure the centrifugal acceleration and the like generated in the cutting tool 101 when the cutting tool 101 is rotated. Further, since the position of the sensor in the direction along the axial direction of the shaft portion 11 is involved in the bending component of the displacement generated in the cutting tool 101 due to cutting, the value related to the bending component is calculated. Can be done. Further, since the position of the sensor in the radial direction of the shaft portion 11 is involved in the torsional component of the displacement generated in the cutting tool 101 due to cutting, the value relating to the torsional component is obtained by the above configuration. Can be calculated.

Further, in the cutting tool according to the first embodiment of the present disclosure, the cutting tool 101 further includes a sensor attached to the shaft portion 11.

With such a configuration, it is possible to provide a cutting tool 101 with a sensor capable of measuring the state of the cutting tool 101 under a wider variety of machining conditions.

Further, in the cutting tool according to the first embodiment of the present disclosure, the sensor is an acceleration sensor 14, and the measurement direction 141 of the acceleration sensor 14 is a plane 18 whose normal line is the central axis 17 of the shaft portion 11. Along the direction perpendicular to the straight line connecting the acceleration sensor 14 and the central axis 17.

Further, in the cutting tool according to the first embodiment of the present disclosure, the cutting tool 101 includes at least one of a strain sensor 19, a temperature sensor 26, and a sound sensor 27 as the sensor.

With such a configuration, for example, at least one of an abnormal increase in strain generated in the shaft portion 11 and frictional heat and abnormal noise when an abnormal vibration is generated in the shaft portion 11 can be detected. Can be done.

Further, in the cutting tool according to the first embodiment of the present disclosure, the cutting tool 101 further includes a wireless communication device 23. The wireless communication device 23 transmits sensor information indicating the measurement result of the sensor.

Further, the cutting system according to the first embodiment of the present disclosure includes a cutting tool 101 and a management device 301. The management device 301 receives sensor information from the cutting tool 101.

In this way, the size of the measurement result such as acceleration can be changed by changing the position of the sensor due to the configuration in which the mounting position of the sensor on the shaft portion 11 can be changed. Thereby, the sensitivity of the sensor can be easily changed according to the processing conditions.

Therefore, in the cutting system according to the first embodiment of the present disclosure, the state of the cutting tool 101 can be measured under a wider variety of machining conditions. Further, for example, in the management device 301, processing such as abnormality detection using the measurement results of each sensor can be performed.

Further, in the cutting tool according to the first embodiment of the present disclosure, the shaft portion 11 has a rod shape and includes the enlarged diameter portion 15. The diameter-expanded portion 15 has a larger diameter than the other portions of the shaft portion 11, and a sensor can be attached to the enlarged diameter portion 15. The position changing portion 50 can change the mounting position of the sensor in the enlarged diameter portion 15.

With such a configuration, the rigidity of the shaft portion 11 is ensured by the enlarged diameter portion 15, so that the rigidity of the shaft portion 11 is ensured even when a part of the shaft portion 11 is removed and the sensor is attached, for example. While doing so, the sensor can be attached to the shaft portion 11.

Further, in the cutting tool according to the first embodiment of the present disclosure, the enlarged diameter portion 15 has a flat surface 55 parallel to the central axis 17 of the shaft portion 11. The enlarged diameter portion 15 has a shape in which a portion opposite to the central axis 17 with respect to the surface 55 is removed.

Since the sensor can be easily attached to the flat surface 55 and the member for adjusting the position of the sensor can be easily attached to the flat surface 55, the position of the sensor can be easily changed in the radial direction Y of the shaft portion 11. be able to.

Further, in the cutting tool according to the first embodiment of the present disclosure, the enlarged diameter portion 15 has a recess 16 which is open at a part of the surface 55 and is recessed toward the central axis 17. The bottom surface 161 of the recess 16 is a plane parallel to the surface 55.

It is easy to attach the sensor to the flat bottom surface 161 and, by attaching the sensor to the bottom surface 161 it is possible to change the sensor position in the radial direction Y of the shaft portion 11 using, for example, the position changing plate 56. Therefore, the position of the sensor can be easily changed.

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 second embodiment of the present disclosure relates to a processing method using a cutting system such as the cutting system 201 according to the first embodiment. Except for the contents described below, the cutting system 201 is the same as that of the first embodiment. Hereinafter, as an example, a processing method when the cutting system 201 is used will be described.

In the wireless communication unit 31 of the management device 301 of the cutting system 201 according to the second embodiment of the present disclosure, the object to be cut is cut by the cutting tool 101 attached to the machine tool 202, and the position changing unit 50 cuts the object to be cut. When the mounting position of the sensor is changed and the cutting tool 101 whose mounting position of the sensor is changed cuts the object to be cut, the storage processing unit stores the measurement result of the sensor each time the cutting is performed. Write in 35.

The control unit 32 processes each measurement result written by the wireless communication unit 31.

FIG. 25 is a flowchart defining the procedure of the processing method according to the second embodiment of the present disclosure.

With reference to FIG. 25, the processing method M according to the second embodiment of the present disclosure is a processing method using a cutting tool 101.

In the processing method M, first, the machine tool 202 cuts the object to be cut by the cutting tool 101 (step S201).

Next, the management device 301 accumulates the measurement results of the sensor (step S203).

Next, the user changes the position of the sensor by the position changing portion 50 of the cutting tool 101 (step S205).

Next, the machine tool 202 cuts the object to be cut by the cutting tool 101 whose sensor position has been changed (step S207).

Next, the management device 301 accumulates the measurement results of the sensor (step S209).

Next, the management device 301 processes each accumulated measurement result (step S211).

In the processing method M, a plurality of sensors may be used, one sensor may be used, and for example, one acceleration sensor 14 or one strain sensor 19 may be used. Further, in the processing method M, one or a plurality of sensors different from the acceleration sensor 14 and the strain sensor 19 may be used.

More specifically, the processing method M is used, for example, when there is a problem in cutting of a machine tool and the cause is verified.

Specifically, in the machine tool 202, for example, the cause of the defect is a portion other than the cutting tool, for example, a tool holder 210 for holding the cutting tool 101 and a spindle 220 for holding the tool holder 210. It is a method of determining whether or not.

In the processing method M shown in FIG. 25, the user first attaches the cutting tool 101 to the tool holder of the machine tool 202, cuts the object to be cut by the cutting tool 101 (step S201), and measures the acceleration sensor 14. Is stored in the management device 301 (step S203).

Next, the user changes the position of the acceleration sensor 14 on the cutting tool 101 (step S205).

Next, the user attaches the cutting tool 101 whose position of the acceleration sensor 14 has been changed to the tool holder 210 of the machine tool 202, cuts the object to be cut by the cutting tool 101 (step S207), and the acceleration sensor 14 The measurement result of is stored in the management device 301 (step S209).

Next, the user analyzes the accumulated measurement result of the acceleration sensor 14 using the management device 301. The management device 301 is not limited to the analysis of the measurement result, and may be configured to perform other types of processing (step S211).

In the processing method M, the measurement result of the acceleration sensor 14 can be used more significantly as compared with the first embodiment. Hereinafter, a detailed description will be given.

FIG. 26 is a side view schematically showing the cutting tool, the tool holder, and the spindle according to the second embodiment of the present disclosure.

In FIG. 26, the tool holder 210 and the spindle 220 are integrated and shown as one member for easy understanding. The integrated member is also referred to as a support member 230.

With reference to FIG. 26, bending and twisting that occur in the cutting tool 101, and displacement that occurs in the support member 230 will be described.

When cutting with the cutting tool 101, it is assumed that a load, that is, a cutting resistance F [N] is applied from the object to be cut to the blade portion of the cutting tool 101. In this case, the displacement X1 [mm] due to bending generated in the cutting tool 101 can be formulated by the following equation (2).

In the formula (2), d is the distance [mm] from the end of the cutting tool 101 to the measurement position of the acceleration, L is the distance [mm] from the end of the cutting tool 101 to the support member 230, and I. Is the cross-sectional secondary moment [mm ^ 4] of the cutting tool 101, and E is the Young ratio [MPa] of the cutting tool 101.

Further, when the cutting resistance F is added to the cutting tool 101, the displacement X2 [mm] due to the twist generated in the cutting tool 101 can be formulated by the following formula (3).

In the formula (3), d is the distance [mm] from the end of the cutting tool 101 to the measurement position of the acceleration, L is the distance [mm] from the end of the cutting tool 101 to the support member 230, and rforce. Is the point of action of the cutting resistance F and the distance [mm] between the central shaft 17 of the cutting tool 101, that is, the distance between the blade and the central shaft 17, and the riser is the mounting position of the acceleration sensor 14 and the distance between the central shaft 17. [Mm], G is the transverse elastic coefficient [MPa] of the cutting tool 101, and J is the cross-sectional secondary pole moment [mm ^ 4] of the cutting tool 101.

Further, when the cutting resistance F is applied to the cutting tool 101, the displacement X3 [mm] generated in the support member 230 can be formulated by the following equation (4).

In equation (4), K3 is a predetermined coefficient [mm / N].

Equations (2) to (4) are based on the premise that the displacement of the sensor position when a load is applied to the cantilever is proportional to the acceleration generated at that position.

Equations (2) to (4) can be summarized as equations (5) and (6).

In the brackets on the right side of equation (6), the first term from the left is defined as C1 × P1, the second term is defined as C2 × P2, and the third term is defined as C3 × P3.

C1 × P1, C2 × P2, and C3 × P3 correspond to the displacement amount due to bending of the cutting tool 101, the displacement amount due to twisting of the cutting tool 101, and the displacement amount of the support member 230, respectively.

That is, in the first item above, (L ^ 3) / (3EI) is C1 and the other part is P1. Further, in the second item above, rforce / (GJ) is C2 and the other part is P2. Further, in the third item above, 1 / K3 is C3 and P3 is 1.

With reference to equation (6), C1 is determined by Young's modulus E and the moment of inertia of area I, C2 is determined by the modulus of lateral elasticity G and the moment of inertia of area J, and C3 is determined by the predetermined coefficient K3. To. Young's modulus E, moment of inertia of area I, transverse elastic modulus G and moment of inertia of area J are determined by the cutting tool 101 and can be grasped by conducting a survey in advance, but it is very troublesome to grasp. It takes. On the other hand, since the predetermined coefficient K3 is determined by the support member 230, it is difficult to measure. Further, since the numerical value represented by P1 is determined by the distance d and the distance L, and the numerical value represented by P2 is determined by the distance d, the distance L and the distance rsensol, each of the numerical values is the installation position of the sensor. If you can understand, the calculation is easy.

In the example shown in FIG. 1, since eight sensor positions A1 to A8 are provided, P1, P2 and P3, and the measured acceleration value acc are summarized in the following determinant (7) for each of the eight positions. Describe.

On the left side of the equation (7), for example, P11, P21, and P31 are the value of P1 at the sensor position A1 in FIG. 1, the value of P2 at the sensor position A1, and the value of P3 at the sensor position A1, respectively. Further, P12, P22, and P32 are the value of P1 at the sensor position A2 in FIG. 1, the value of P2 at the sensor position A2, and the value of P3 at the sensor position A2, respectively.

On the right side of equation (7), for example, acc1 is the measurement result when the acceleration sensor 14 is attached to the sensor position A1 in FIG. 1, and acc2 is the measurement result when the acceleration sensor 14 is attached to the sensor position A2 in FIG. The result.

Multiplying the left side of equation (7) by the inverse matrix of the matrix related to P in equation (7) leads to the following equation (8).

That is, by calculating the right side of the equation (8), C1, C2 and C3 on the left side are calculated.

By calculating C1, C2 and C3, the values in parentheses on the right side of the equation (6), that is, C1 × P1, C2 × P2, and C3 × P3, respectively, can be calculated.

That is, the amount of displacement due to bending of the cutting tool 101, the amount of displacement due to twisting of the cutting tool 101, and the amount of displacement of the support member 230 can be calculated.

In other words, for each of the sensor positions A1 to A8, the ratio of each component of the acceleration due to bending of the cutting tool 101, the acceleration due to twisting of the cutting tool 101, and the acceleration of the support member 230 in the acceleration measurement result is calculated. Can be done.

FIG. 27 is a graph showing three components of the acceleration measurement result calculated by the processing method according to the second embodiment of the present disclosure.

The horizontal axis and the vertical axis in FIG. 27 indicate the accelerations generated at the sensor positions A1 to A8 and the sensor positions shown in FIG. 1, respectively.

FIG. 27 shows the ratio of the acceleration component Xa due to bending of the cutting tool 101, the ratio of the acceleration component Xb due to twisting of the cutting tool 101, and the acceleration of the support member 230 for each measurement result of the acceleration at the sensor positions A1 to A8. The ratio of the component Xc is shown.

Consider the contents of FIG. 22. First, by comparing the magnitudes of the component Xab, which is the sum of the component Xa and the component Xb, and the component Xc, among the accelerations generated at the measurement position during cutting, the magnitude and support of the acceleration caused by the cutting tool 101. It is possible to compare with the magnitude of the acceleration caused by the member 230.

As a result of comparison, when the size of the component Xc is too large compared to the size of Xab, it can be determined that the rigidity of the support member 230 is too low, for example. That is, for example, when there is a defect in the machine tool 202, it can be determined that the cause of the defect is the tool holder 210 and the spindle 220.

The comparison between the size of the component Xab and the size of the component Xc is, for example, a comparison between the average value of the component Xab at the sensor positions A1 to A8 and the size of the component Xc, or the maximum value of the component Xab at the sensor positions A1 to A8. It is a comparison with the size of the component Xc.

Further, the closer the mounting position of the acceleration sensor 14 is to the end of the cutting tool 101, the larger the measurement result of the acceleration sensor 14 tends to be. Therefore, the sensitivity of the acceleration sensor 14 can be adjusted by changing the mounting position of the acceleration sensor 14 between the sensor positions A1 to A8. Therefore, by changing the mounting position of the acceleration sensor 14 according to the magnitude of the cutting resistance F applied to the cutting tool 101, it is possible to perform appropriate measurement according to the machining conditions.

Next, an example of processing of the management device 301 according to the second embodiment of the present disclosure will be described.

[Operation flow]
The management device 301 includes a computer including a part or all of the storage unit 35, and an arithmetic processing unit such as a CPU in the computer stores a program including a part or all of each step of the following flowchart and sequence. Read from the memory such as, and execute. The program for this device can be installed externally. The program of this device is distributed in a state of being stored in a recording medium.

FIG. 28 is a flowchart defining the operation procedure of the management device in the cutting system according to the second embodiment of the present disclosure.

With reference to FIG. 28, first, the wireless communication unit 31 receives a wireless signal including sensor information and position information from the wireless communication device 23 of the cutting tool 101 attached to the machine tool 202, and converts the wireless signal into the wireless signal. The measurement result and the position information of the acceleration sensor 14 indicated by the included sensor information are stored in the storage unit 35. The acceleration sensor 14 is attached to the sensor position A1 of the cutting tool 101. The position information is the position information corresponding to the sensor position A1 (step S101).

Next, the wireless communication unit 31 receives the wireless signal including the sensor information from the wireless communication device 23 of the cutting tool 101 attached to the machine tool 202 after the position of the acceleration sensor 14 is changed to the sensor position A2 by the user. The measurement result and the position information of the acceleration sensor 14 indicated by the sensor information included in the radio signal are stored in the storage unit 35. The position information is the position information corresponding to the sensor position A2 (step S103).

After that, the wireless communication unit 31 sequentially performs the same processing as described above for the sensor positions A3 to A8 (steps S105 to S115).

Next, the control unit 32 processes each measurement result and each position information stored in the storage unit 35. Specifically, for example, based on each measurement result, each position information, and equations (2) to (8), for each of the sensor positions A1 to A8, the acceleration due to bending of the cutting tool 101 in the acceleration measurement result, The ratio of each component of the acceleration due to the twist of the cutting tool 101 and the acceleration of the support member 230 is calculated (step S117).

Next, the display unit 33 displays the ratio of the acceleration component Xa due to bending of the cutting tool 101, the ratio of the acceleration component Xb due to twisting of the cutting tool 101, and the support member for each measurement result of the acceleration at the sensor positions A1 to A8. The ratio of the acceleration component Xc of 230 is displayed as a graph as shown in FIG. 27, for example (step S119).

As described above, in the processing method according to the second embodiment of the present disclosure, the user first cuts the object to be cut by the cutting tool 101 attached to the machine tool 202. Next, the management device 301 accumulates the measurement results of the sensor. Next, the user changes the mounting position of the sensor by the position changing unit 50. Next, the user cuts the object to be cut by the cutting tool 101 whose mounting position of the sensor is changed. Next, the management device 301 accumulates the measurement results of the sensor. Next, the management device 301 processes each accumulated measurement result.

Therefore, in the processing method according to the second embodiment of the present disclosure, the state of the cutting tool 101 can be measured under a wider variety of machining conditions.

Further, based on the measurement results of the sensors at the plurality of positions, for example, among the displacements generated at each of the plurality of positions, the component due to the bending of the cutting tool, the component due to the twisting of the cutting tool, and the cutting tool are supported. The value related to the displacement component of the support member can be calculated. That is, the state of the cutting tool 101 and the state of the support member 230 that supports the cutting tool 101 can be grasped.

Further, in the processing method according to the second embodiment of the present disclosure, the management device 301 calculates the component corresponding to the machine tool 202 from the measurement result.

With such a configuration, for example, the state of the support member 230 that supports the cutting tool 101 in the machine tool 202 can be grasped.

Further, in the processing method according to the second embodiment of the present disclosure, the sensor is an acceleration sensor 14.

With such a configuration, based on the measurement results of the acceleration sensor 14 at the plurality of positions, for example, the value related to the component of the acceleration due to the bending of the cutting tool 101 among the accelerations generated at each of the plurality of positions, the cutting tool. It is possible to calculate the value related to the acceleration component due to the twist of 101 and the value related to the acceleration component of the support member 230 that supports the cutting tool 101. Therefore, the state of the cutting tool 101 and the state of the support member 230 that supports the cutting tool 101 can be grasped.

In the management device 301 according to the second embodiment of the present disclosure, in the wireless communication unit 31, the cutting tool 101 attached to the machine tool 202 cuts the object to be cut, and the position changing unit 50 attaches the sensor. When the cutting tool 101 whose position has been changed and the mounting position of the sensor has been changed cuts the object to be cut, the measurement result of the sensor is written in the storage unit 35 each time each cutting is performed. The control unit 32 processes each measurement result written by the wireless communication unit 31.

Therefore, the management device according to the second embodiment of the present disclosure can measure the state of the cutting tool 101 under a wider variety of machining conditions.

Further, based on the measurement results of the sensors at the plurality of positions, for example, among the displacements generated at each of the plurality of positions, the value relating to the component due to bending of the cutting tool 101, the value relating to the component due to twisting of the cutting tool 101, And the value regarding the displacement component of the support member supporting the cutting tool 101 can be calculated. That is, the state of the cutting tool 101 and the state of the support member 230 that supports the cutting tool 101 can be grasped.

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

The above description includes the features described below.
[Appendix 1]
The shaft part to which the sensor can be attached and
A position changing portion capable of changing the mounting position of the sensor on the shaft portion is provided.
The shaft portion has a larger diameter than the other portion of the shaft portion and includes an enlarged diameter portion to which the sensor can be attached.
The position changing portion can change the mounting position of the sensor in the enlarged diameter portion.
The enlarged diameter portion has a flat surface parallel to the central axis of the shaft portion.
The enlarged diameter portion has a shape in which a portion opposite to the central axis with respect to the surface is removed.
The enlarged diameter portion has a recess that is open at a part of the surface and is recessed on the central axis side.
A cutting tool in which the bottom surface of the recess is a flat surface parallel to the surface.

11 Shaft part 12 Blade mounting part 14 Accelerometer 15 Expansion part 17 Central axis 18 Flat surface 19 Distortion sensor 22 Battery 23 Wireless communication device 24 Housing 26 Temperature sensor 27 Sound sensor 31 Wireless communication unit 32 Control unit 33 Display unit 35 Storage unit 36 Operation input part 50 Position change part 51

Pedestal part

53, 57, 60

Thread hole

54, 58 Male thread member 55 Surface 56 Position change plate 101-103 Cutting tool 111 Shank 143 Straight line 161

Bottom surface

201, 203, 205

Cutting system

202, 204, 206 Machine tool 210 Tool holder 220 Spindle 230 Support member 301 Management device A1 to A8 Sensor position

Claims

The shaft part to which the sensor can be attached and
A cutting tool including a position changing portion capable of changing the mounting position of the sensor on the shaft portion.
The shaft portion has a rod shape and includes a diameter-expanded portion.
The enlarged diameter portion has a larger diameter than the other portion of the shaft portion, and the sensor can be attached to the enlarged diameter portion.
The cutting tool according to claim 1, wherein the position changing portion can change the mounting position of the sensor in the enlarged diameter portion.
The cutting tool according to claim 1 or 2, wherein the position changing portion is configured so that the position of the sensor can be changed along the axial direction of the shaft portion.
The cutting tool according to claim 1 or 2, wherein the position changing portion is configured so that the position of the sensor can be changed along the radial direction of the shaft portion.
The position changing portion is configured so that the position of the sensor can be changed along the axial direction of the shaft portion, and the position of the sensor can be changed along the radial direction of the shaft portion. , The cutting tool according to claim 1 or 2.
The cutting tool further
The cutting tool according to any one of claims 1 to 5, further comprising a sensor attached to the shaft portion.
The sensor is an acceleration sensor.
The claim that the measurement direction of the acceleration sensor is a direction along a plane having a rotation axis of the shaft portion as a normal line and along a direction orthogonal to a straight line connecting the acceleration sensor and the rotation axis. The cutting tool according to 6.
The cutting tool according to claim 6, wherein the cutting tool includes at least one of a strain sensor, a temperature sensor, and a sound sensor as the sensor.
The cutting tool further
Equipped with wireless communication device
The cutting tool according to any one of claims 6 to 8, wherein the wireless communication device transmits sensor information indicating a measurement result of the sensor.
The shaft portion has a cylindrical shape and has a cylindrical shape.
The cutting tool according to any one of claims 1 to 9, wherein the cutting tool is a rolling tool.
The cutting tool according to claim 9 and
Equipped with a management device
The management device is a cutting system that receives sensor information indicating a measurement result of the sensor from the cutting tool.
It is a processing method that uses a cutting tool.
The cutting tool
The shaft part to which the sensor can be attached and
A position changing portion capable of changing the mounting position of the sensor on the shaft portion is provided.
The processing method is
A step of cutting an object to be cut with the cutting tool attached to a machine tool and accumulating the measurement results of the sensor.
The step of changing the mounting position of the sensor by the position changing portion, and
A step of cutting an object to be cut with the cutting tool whose mounting position of the sensor has been changed and accumulating the measurement results of the sensor.
A processing method including a step of processing each of the accumulated measurement results.
The processing method according to claim 12, wherein in the step of processing each measurement result, the component corresponding to the machine tool is calculated from the measurement result.
The processing method according to claim 12, wherein the sensor is an acceleration sensor.
A processing program used in a management device that manages cutting tools.
The cutting tool
The shaft part to which the sensor can be attached and
A position changing portion capable of changing the mounting position of the sensor on the shaft portion is provided.
Computer,
The object to be cut is cut by the pre-cutting tool attached to the machine tool, the attachment position of the sensor is changed by the position change portion, and the object to be cut is changed by the cutting tool whose attachment position of the sensor is changed. When cutting is performed, a storage processing unit that writes the measurement result of the sensor to a storage unit each time the cutting is performed, and a storage processing unit.
A control unit that processes each measurement result written by the storage processing unit,
A processing program to function as.