JP7258189B2 - CUTTING TOOL, CUTTING TOOL HOLDER AND WORK MATERIAL CUTTING METHOD - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a cutting tool, a cutting tool holder, and a work material cutting method.

For example, wood, metal, or the like (hereinafter referred to as a work material) is rotated by a machine tool and cut by a cutting tool in contact with the machine tool. By being cut by the cutting tool, the cut material is processed into a desired size and shape.

The cutting tool may include sensors. For example, the operator can know information during cutting of the work material through the physical quantity detected by the sensor. As a cutting tool including such a sensor, a cutting tool described in JP-A-2012-20359 is known.

A cutting tool according to one aspect of the present disclosure has a body portion, a cutting insert, and a plurality of sensors. The main body extends along the X direction of the XYZ orthogonal coordinate system, has a pocket at the tip, and has a recess opening on the outer surface on the rear end side of the pocket. The cutting insert is located in the pocket. The plurality of sensors are positioned within the recess. The recess has a bottom surface and an inner wall positioned between the bottom surface and the outer surface of the body portion. The plurality of sensors includes a first sensor fixed to the bottom surface and a second sensor fixed to a fixed wall that is part of the inner wall and faces in a predetermined direction.

A work material cutting method according to an aspect of the present disclosure includes steps of rotating a work material, bringing the cutting tool into contact with the rotating work material to cut the work material, and cutting and releasing the cutting tool from the cut material.

A cutting tool holder according to one aspect of the present disclosure includes a main body and a plurality of sensors. The main body has a rod shape, has a pocket at the tip, and has a recess opening to the outer surface on the rear end side of the pocket. The plurality of sensors are positioned within the recess. The recess has a bottom surface and an inner wall connecting the bottom surface and the outer surface of the main body. The plurality of sensors includes a first sensor fixed to the bottom surface and a second sensor fixed to a fixed wall that is part of the inner wall and faces in a predetermined direction.

It is the figure which showed the condition which cuts the cut material fixed to the machine tool with the cutting tool of 1st Embodiment. 2(A) is a view showing the cutting tool before being fixed to the tool post shown in FIG. 1, and FIG. 2(B) is a cutting tool fixed to the tool post shown in FIG. FIG. 4 shows a tool; 3 is a perspective view of the cutting tool shown in FIG. 2; FIG. 4 is an enlarged view around the insert shown in FIG. 3; FIG. FIG. 4 is a cross-sectional view taken along the line VV shown in FIG. 3; 2C is a cross-sectional view taken along the line VI-VI shown in FIG. 2B; FIG. 6 is an enlarged view of VII shown in FIG. 5; FIG. 3 is a diagram for explaining a process of cutting a work material using the cutting tool shown in FIG. 2; FIG. It is a sectional view of a cutting tool in a 2nd embodiment. It is a sectional view of a cutting tool in a 3rd embodiment. It is a perspective view of the cutting tool in 4th Embodiment.

Embodiments of the present disclosure will be described below with reference to the accompanying drawings. The accompanying drawing shows a Cartesian coordinate system XYZ. Each direction of this orthogonal coordinate system XYZ is defined on the basis of FIG.

Furthermore, to facilitate understanding, front, back, left, right, up and down are defined. Here, front and rear are terms used to specify the positional relationship along the longitudinal direction of the cutting tool. Left and right are terms used to specify the positional relationship when the end of the cutting tool is viewed from behind. Similar to left and right, "up and down" are terms that specify the positional relationship when the end of the cutting tool is viewed from the rear, and also specify the direction perpendicular to the left and right direction. The relationship between the X direction, Y direction and Z direction (hereinafter sometimes referred to as XYZ directions) and the vertical direction (gravitational direction) is arbitrary.

Regarding the directions shown in the accompanying drawings of the present disclosure, the X direction is along the front-rear direction, the Y direction is along the left-right direction, and the Z direction is along the up-down direction. The directions of up, down, front, back, left and right are indicated in the accompanying drawings by Fr for front, Rr for rear, Le for left, Ri for right, Up for up, and Dn for down.

[First embodiment]
(Machine Tools)
Please refer to FIG. The machine tool 1 may be a machine used for cutting the work material Ob into a desired shape and size. The machine tool 1 may have a tool rest 10 holding a cutting tool 20 . The cutting tool 20 held on the tool post 10 can be moved in each direction of the orthogonal coordinate system XYZ (up, down, front, back, left, and right) by, for example, manual operation or automatic operation of the machine tool 1 . Through such an operation (automatically or manually), for example, the cutting tool 20 is pressed against the rotating work material Ob (wood, metal, etc.). Thereby, the work material Ob is cut.

(Turret)
Please refer to FIGS. 2A and 2B. The tool post 10 may have a wall portion 11, a first protrusion portion 12, a second protrusion portion 13, a screw hole 14, and a plurality of biasing portions 15 (three in the drawing). . The outer surface of the cutting tool 20 may contact the wall portion 11 . The first projecting portion 12 may project laterally (in the Y direction) from the side surface of the wall portion 11 . The second protruding portion 13 may protrude laterally (in the Y direction) from the side surface of the wall portion 11 . The screw hole 14 may pass through the second projecting portion 13 in the Z direction (vertical direction). The plurality of urging portions 15 may be screwed into the screw holes 14 and may be members that urge the cutting tool 20 toward the first projecting portion 12 .

The first projecting portion 12 may have a mounting surface 12a on which the cutting tool 20 is mounted. A cutting tool 20 may be placed on the placement surface 12a. The biasing portion 15 may contact the cutting tool 20 and bias it toward the mounting surface 12a. The number of urging portions 15 is arbitrary. The number of biasing portions 15 may be two, or may be three or more.

The shape of the tool post 10 is not limited to the shape shown in FIG. A specific configuration capable of holding the cutting tool 20 in the tool post 10 may be made as appropriate.

(Cutting tools)
The cutting tool 20 is detachably attached to the machine tool 1 (tool rest 10). The cutting tools 20 include an outer diameter cutting tool for cutting the outer diameter of the work material Ob, an inner diameter cutting tool for cutting the inner diameter of the work material Ob, a grooving tool for making grooves in the work material Ob, a thread cutting tool, and a thread cutting tool. Cut-off tools and the like are included. The cutting tool 20 can also be called a cutting tool.

As in the example shown in FIG. 3, the cutting tool 20 includes an insert 30 (cutting insert 30), a holder 40 that supports the insert 30, a clamp 21 that biases the insert 30 toward the holder 40, and a screw 22 securing the clamp 21 to the holder 40 .

(Structure around insert and insert)
As in the example shown in FIG. 4, the insert 30 may be a replaceable insert called a throwaway insert. The shape of the insert 30 can be changed according to the material, shape, etc. of the work material Ob (see FIG. 1). As in the example shown in FIG. 3, the insert 30 may have the shape of a square plate. In other aspects, the insert 30 may exhibit a triangular plate shape or a pentagonal plate shape.

The size of the insert 30 can be set arbitrarily. The thickness (Z direction) of the insert 30 may be, for example, 5 mm or more and may be 20 mm or less. The width (Y direction) of the insert 30 may be, for example, 10 mm or more and may be 20 mm or less. The size of the insert 30 may be changed depending on the material of the work material Ob.

The material of the insert 30 can be set arbitrarily. For example, the material of the insert 30 may be cemented carbide, cermet, or the like. The composition of the cemented carbide may be, for example, WC--Co, WC--TiC--Co and WC--TiC--TaC--Co. WC, TiC and TaC are hard particles. Co, on the other hand, is the binder phase. A cermet is a sintered composite material in which a metal is combined with a ceramic component. Specific examples of cermets include titanium compounds containing TiC and/or TiN as main components.

The surface of the insert 30 may be provided with a coating, such as by chemical vapor deposition or physical vapor deposition. For example, the coating may consist of TiC, TiN, TiCN, Al2O3, and the like.

The insert 30 may have a first side 31 , a second side 32 and a third side 33 . As shown in FIG. 4, the first surface 31 may face the Z direction (upward). The second surface 32 may be located on the opposite side of the first surface 31 and face downward (in the negative direction of Z). A third surface 33 connects the first surface 31 and the second surface 32 and may form a side surface of the insert 30 .

A cutting edge 34 may be positioned at the boundary between the first surface 31 and the third surface 33 . The first face 31 may have a rake face 31 a connected to the cutting edge 34 . The third surface 33 may have a flank 33 a connected to the cutting edge 34 . The cutting edge 34 may be a ridgeline located between the rake face 31a and the flank face 33a.

The cutting edge 34 may be a portion that bites into the work material Ob (see FIG. 1) and directly contributes to the cutting of the work material Ob (see FIG. 1). The cutting edge 34 may microscopically include a curved surface. The rake face 31a may be a portion through which chips flow when cutting the work material Ob. The rake face 31a can have grooves and/or protrusions and the like. The flank 33a may be inclined at a predetermined angle with respect to the rake face 31a so that the insert 30 does not contact the work material Ob more than necessary.

As in the example shown in FIG. 4 , the insert 30 may be provided with a through hole 35 opening to the first surface 31 and the second surface 32 . A portion of the clamp 21 that biases the insert 30 toward the holder 40 (negative Z direction) may be inserted into the through hole 35 . The insert 30 is thereby fixed.

(holder)
Please refer to FIG. The holder 40 may extend from a front end 40a (first end 40a) toward a rear end 40b (hereinafter also referred to as a second end 40b). From another point of view, it can be said that the holder 40 may extend along the X direction of the orthogonal coordinate system XYZ. Such a holder 40 may, for example, have a bar shape. The length of the rod-shaped holder 40 is arbitrary. For example, the holder 40 may have a length of 50 mm or more and 200 mm or less.

The size of the holder 40 can be set arbitrarily. The holder 40 has a predetermined width in the Y direction and a predetermined height in the Z direction. The width and height of the holder 40 may be 10 mm or more, 19 mm or more, 25 mm or more, or 50 mm or more. The width and height of holder 40 may differ from each other. Furthermore, the height of holder 40 may increase toward tip 40a.

Please refer to FIG. The holder 40 may have a body portion 50 , a plurality of sensors 41 and wiring 45 . The body portion 50 is a base portion of the holder 40 and occupies most of the holder 40 . The plurality of sensors 41 are positioned inside the body portion 50 respectively. The wiring 45 is electrically connected to the plurality of sensors 41 .

(main body)
The material of the body portion 50 is arbitrary. The material of the body portion 50 may be steel, cast iron, or the like. From the viewpoint of increasing the flexibility of the body portion 50, cast iron may be used as the material of the body portion 50. The description of the size and shape of the holder 40 can be used to describe the size and shape of the main body 50 . The front end of the body portion 50 may constitute the first end 40a, and the rear end of the body portion 50 may constitute the second end 40b.

The body portion 50 shown in FIG. 3 extends along the X direction of the orthogonal coordinate system XYZ. The body portion 50 may have a first surface 51 , a second surface 52 , a third surface 53 and a fourth surface 54 .

The first surface 51 may face the direction in which the first surface 31 of the insert 30 faces (the Z direction in the drawing). The second surface 52 may be located opposite the first surface 51 . The third surface 53 may connect the first surface 51 and the second surface 52 and may face the direction (the Y direction in the drawing) facing the third surface 33 of the insert 30 . A fourth surface 54 may be located opposite the third surface 53 and connect the first surface 51 and the second surface 52 . It should be noted that the above-mentioned "to face" does not need to mean the direction that coincides with that direction, and it is sufficient that the side faces constituting the main body portion 50 face the most in that direction. The same may be applied to "to face" used in the following description.

Please refer to FIG. The biasing portion 15 of the tool rest 10 may abut against the first surface 51 . The second surface 52 may come into contact with the mounting surface 12 a of the first protrusion 12 . The fourth surface 54 may abut the wall 11 .

Please refer to FIG. The body portion 50 may further have a first end surface (front end surface) and a second end surface (rear end surface). The first end surface may be located at the first end (tip) 40 a of the holder 40 . The second end surface may be positioned at the second end 40 b (rear end) of the holder 40 . The first surface 51, the second surface 52, the third surface 53 and the fourth surface 54 may each extend from the first end surface 40a toward the second end surface 40b. At this time, the first surface 51, the second surface 52, the third surface 53 and the fourth surface 54 may be connected to the first end surface 40a and the second end surface 40b, respectively.

Returning to the description of the configuration of the main body 50 again. The body portion 50 has a pocket 55 at its tip 40a. The pocket 55 may be, for example, a depression that lacks a part of the body portion 50 . An insert 30 capable of cutting the work material Ob is positioned in the pocket 55 .

(recess)
The body portion 50 is provided with a recessed portion 60 that opens to the outer surface of the body portion 50 . A plurality of sensors 41 are positioned within the recess 60 . The portion of the outer surface of the body portion 50 that opens into the recess 60 is arbitrary. For example, the body portion 50 may be opened to the first surface 51, may be opened to the second surface 52, may be opened to the third surface 53, or may be opened to the fourth surface 54. may FIG. 3 shows the main body portion 50 opened to the third surface 53 . Hereinafter, for the sake of convenience, expressions may be made on the premise that the recess 60 opens to the third surface 53 .

The size and shape of the recess 60 are arbitrary. For example, the recess 60 may open to 20% or more of the third surface 53 or may open to 70% or less of the third surface 53 . The recess 60 may have a rectangular shape, for example, when the recess 60 is viewed from the front.

Please refer to FIGS. 3 and 5-7. The recess 60 may have a bottom surface 61 , an inner wall 62 and a connecting surface 63 . The inner wall 62 is positioned between the bottom surface 61 and the outer surface of the body portion 50 . The inner wall 62 is continuous with the outer surface of the body portion 50 . The connecting surface 63 may connect the bottom surface 61 and the inner wall 62 . The connecting surface 63 may be arched between the bottom surface 61 and the inner wall 62 .

Please refer to FIG. In another aspect, the recess 60 may have a first recess 70 in which at least one sensor is arranged and a second recess 80 in which at least one sensor is arranged. As in the illustrated example, the first recess 70 may be connected to the second recess 80 . Unlike the illustrated example, the first recess 70 and the second recess 80 may be separated from each other.

The first recess 70 and the second recess 80 may be arranged in the longitudinal direction of the cutting tool 20 . When the first recessed portion 70 and the second recessed portion 80 are arranged in the longitudinal direction of the cutting tool 20, the second recessed portion 80 may be located closer to the tip 40a of the body portion 50 than the first recessed portion 70, or the second recessed portion 80 The first concave portion 70 may be located at the tip 40 a of the main body portion 50 . The first concave portion 70 and the second concave portion 80 may be arranged in another direction (for example, the transverse direction of the cutting tool 20).

The sizes of the first concave portion 70 and the second concave portion are each arbitrary. For example, when viewing the recess 60 from the front, the first recess 70 may be larger than the second recess 80 or smaller than the second recess 80 . The shapes of the first recess 70 and the second recess 80 are arbitrary. As shown in FIG. 3 , the first concave portion 70 may have a rectangular shape whose longitudinal direction is the X direction (front-rear direction) when the concave portion 60 is viewed from the front. On the other hand, the second recessed portion 80 may have a rectangular shape whose longitudinal direction is the Z direction (vertical direction) when the recessed portion 60 is viewed from the front. The first recess 70 and/or the second recess 80 may be substantially square when viewed from the front of the recess 60 .

(Structure of first concave portion)
Please refer to FIGS. The first recess 70 includes a first bottom surface 71 that is the bottom surface of the first recess 70, a first inner wall 72 connected to the outer surface of the main body portion 50 and facing the first bottom surface 71, the first bottom surface 71 and the first inner wall. and a first connection surface 73 that connects 72 .

(Structure of second concave portion)
The second recessed portion 80 includes a second bottom surface 81 that is the bottom surface of the second recessed portion 80, a second inner wall 82 connected to the outer surface of the main body portion 50 and facing the second bottom surface 81, the first bottom surface 71 and the second inner wall. and a second connection surface 83 that connects 82 .

(Bottoms of first recess and second recess)
The bottom surface 61 of the recess 60 may be composed of the first bottom surface 71 and the second bottom surface 81 . The bottom surface 61 may face the Y direction of the orthogonal coordinate system XYZ. For example, when the bottom surface 61 of the recess 60 is viewed from the front, the second bottom surface 81 may be positioned next to the first bottom surface 71 so as to be connected to the first bottom surface 71 .

The width of the second bottom surface 81 in the direction orthogonal to the X direction (Z direction) may be larger than the width of the first bottom surface 71 in the same direction, as in the illustrated example. From another point of view, the width of the bottom surface 61 on the side of the front end 40a of the body portion 50 is larger than the width on the side of the rear end 40b of the body portion 50 in the direction perpendicular to the X direction. However, unlike the illustrated example, the width of the second bottom surface 81 in the direction perpendicular to the X direction may be the same as the width of the first bottom surface 71 in the same direction, or the width of the first bottom surface 71 may be It may be smaller than the width in the same direction. In the example shown in FIG. 3, the width of the second bottom surface 81 in the Z direction is 1.2 times or more, 1.5 times or more, or 1.0 times or more and 1.2 times the width of the first bottom surface 71 in the same direction. The following sizes may be used.

The second bottom surface 81 may be located deeper in the recess 60 than the first bottom surface 71 , may be located at the same depth as the first bottom surface 71 , or may be located shallower in the recess 60 than the first bottom surface 71 . may be located. For example, the second recess 80 may have a depth of 1.5 times or more that of the first recess 70, may have a depth of 2 times or more, or may have a depth of 1.0 times or more. It may have a depth of 5 times or less.

Also refer to FIG. The depth of the first concave portion 70 may be 1/3 or less, 1/6 or less, or 1/3 or more of the thickness (Y direction) of the main body portion 50 . The depth of the second concave portion 80 may be 1/2 or less or 1/3 or less of the thickness of the body portion 50 . As shown in FIG. 6 , when the cutting tool 20 is fixed to the tool post 10 , the body portion 50 may be solid on the straight line L extending along the biasing portion 15 . That is, the concave portion 60 may be opened in the body portion 50 so as to avoid the straight line L. However, the concave portion 60 may be positioned so as to overlap the straight line L extending along the biasing portion 15 .

The flank 33a (reference numeral is shown in FIG. 4), the third surface 53, the first bottom surface 71, and the second bottom surface 81 shown in FIG. 3 each face the Y direction of the orthogonal coordinate system XYZ. It should be noted that the term "facing" here does not necessarily mean a direction that coincides with that direction, as described above.

(Inner walls of first recess and second recess)
As shown in FIG. 3 , the inner wall 62 of the recess 60 may have a first inner wall 72 forming the first recess 70 and a second inner wall 82 forming the second recess 80 . For example, when the first recess 70 and the second recess 80 are connected, the first inner wall 72 may be connected with the second inner wall 82 . Hereinafter, the first inner wall 72 and the second inner wall 82 will be described in this order.

The first inner wall 72 may have a first wall surface 72a, a second wall surface 72b, and a third wall surface 72c. The first wall surface 72a is a surface orthogonal to the straight line Lx along the X direction, and may be located on the second end 40b side of the surface forming the recess 60 . The second wall surface 72b may be connected to the first wall surface 72a and positioned on the first surface 51 side. The second wall surface 72b may be a surface orthogonal to the straight line Lz along the Z direction. The third wall surface 72c may be connected to the first wall surface 72a, positioned below the second wall surface 72b and facing the second wall surface 72b. The third wall surface 72c may face the Z direction. The first wall surface 72a may be orthogonal to the second wall surface 72b and the third wall surface 72c.

The first to third wall surfaces 72a, 72b, and 72c have a depth of 1/3 or less, 1/6 or less, or 1/3 or more and 1/2 or less of the thickness of the main body 50 in the depth direction of the recess 60. may have.

The second inner wall 82 may have a fourth wall surface 82a, a fifth wall surface 82b, a sixth wall surface 82c, and a seventh wall surface 82d. The fourth wall surface 82a may be a surface that is perpendicular to the straight line Lx along the X direction and connected to the first recess 70 . The fifth wall surface 82b may be a surface orthogonal to the straight line Lz along the Z direction, which is connected to the fourth wall surface 82a. The fifth wall surface 82b may be positioned on the first surface 51 side. The sixth wall surface 82c may be connected to the fourth wall surface 82a and located below the fifth wall surface 82b. The sixth wall surface 82c may be a surface facing the fifth wall surface 82b. The sixth wall surface 82c may face the Z direction. The seventh wall surface 82d may be a surface that connects the fifth wall surface 82b and the sixth wall surface 82c and faces the X direction (facing the rear end 40b of the main body 50). The seventh wall surface 82d may be a surface of the inner wall 62 that is closest to the first end 40a.

The fourth to seventh wall surfaces 82 a , 82 b , 82 c , 82 d may have a depth of 1/2 or less or 1/3 or less of the thickness of the main body 50 in the depth direction of the recess 60 . The seventh wall surface 82d is separated from the first recess 70 via the fifth wall surface 82b and the sixth wall surface 82c.

The fourth wall surface 82a and the seventh wall surface 82d may be orthogonal to the fifth wall surface 82b and the sixth wall surface 82c. The fourth wall surface 82a and the seventh wall surface 82d may be surfaces parallel to each other. The fifth wall surface 82b and the sixth wall surface 82c may be surfaces parallel to each other. The fourth to seventh wall surfaces 82a, 82b, 82c, and 82d may be orthogonal to the second bottom surface 81 or may not be orthogonal to the second bottom surface 81. As shown in FIG.

Please refer to FIG. A second sensor 41 b is fixed to the inner wall 62 . Here, the portion of the inner wall 62 to which the second sensor 41b is fixed is called a fixed wall Fw. The fixed wall Fw may be, for example, the seventh wall surface 82d (illustrated example), the sixth wall surface 82c, or the fifth wall surface 82b. Furthermore, the fixed wall Fw may be any one of the first to fourth wall surfaces 72a, 72b, 72c, and 72d.

(Connecting surface of first concave portion and second concave portion)
Please refer to FIGS. The connecting surface 63 of the recess 60 may be configured by the first connecting surface 73 and the second connecting surface 83 . The first connecting surface 73 may be curved between the first bottom surface 71 and the first inner wall 72 and may be connected to both. The second connecting surface 83 may be curved between the second bottom surface 81 and the second inner wall 82 and may be connected to both.

(aisle)
Please refer to FIG. The body portion 50 may be provided with passages 56 (reference numerals are shown in FIG. 7) through which wires 45 electrically connected to the plurality of sensors 41 pass. The passage 56 may be a through hole that opens to the bottom surface 61 of the recess 60 , the inner wall 62 of the recess 60 , and the second end surface 40 b of the main body 50 . The passage 56 may have a circular shape or a rectangular shape in a cross-sectional view perpendicular to the direction in which the passage 56 extends.

(multiple sensors)
The multiple sensors 41 are, for example, devices capable of detecting the state of the cutting tool 20 during cutting. The states of the cutting tool 20 detected by the plurality of sensors 41 include, for example, physical quantities such as acceleration, vibration, strain, internal stress, and temperature of the cutting tool 20 during cutting, and physical quantities such as wear and tear of the cutting tool 20. mentioned. “Detect” means detecting at least one or more of the above physical quantities in the cutting tool 20 . Here, the object of detection is not limited to physical quantities in a static state in which the state remains relatively unchanged, and includes, for example, dynamic physical quantities in which the state changes. The static and dynamic states are described in more detail below.

When the physical quantity detected by the plurality of sensors 41 is the acceleration of the cutting tool 20 (body portion 50), for example, when the cutting tool 20 contacts the work material Ob in cutting, the cutting tool 20 (body portion 50) is increased from 0 m/ ^s2 to a predetermined value. At this time, 0 m/s ² before contact with the work material Ob corresponds to a static physical quantity, and the amount of change when it changes from 0 m/s ² to a predetermined value after contact with the work material Ob is dynamic. corresponds to a physical quantity. A plurality of sensors 41 may detect these static physical quantities and dynamic physical quantities. Information about the cutting tool 20 detected by the plurality of sensors 41 is not limited to the above-mentioned acceleration, vibration, internal stress, temperature, wear, and the like.

For example, the sensor may be capable of detecting physical quantities such as acceleration, vibration, strain and internal stress of the main body 50 . A sensor may be capable of detecting only one of these physical quantities, or may be capable of detecting two or more of these physical quantities. For example, the plurality of sensors 41 may include capacitance detection sensors, piezoresistive sensors, or heat detection sensors. If the sensor is of the capacitance detection type, the sensor may be MEMS (Micro Electro Mechanical Systems). The sensor may include an acceleration sensor.

Each sensor of the plurality of sensors 41 may be selected from various types. Each sensor may be of any type as long as it can detect the physical quantity. For example, the sensor may be an acceleration sensor or a strain sensor. Additionally, the sensors may include thermocouples and the like. The physical quantity detected by each sensor may be input to an external device (for example, information processing device Ip) via wiring 45, for example. The physical quantity detected by each sensor may be input to the information processing device Ip via an external device (a device capable of inputting information to the information processing device Ip) input through the wiring 45 . The information processing device Ip will be described later.

As shown in FIG. 3, the multiple sensors 41 include a first sensor 41a fixed to the bottom surface 61 and a second sensor 41b fixed to the inner wall 62 (fixed wall Fw). Each sensor (the first sensor 41a and the second sensor 41b in FIG. 3) is arranged so that the plurality of sensors 41 can detect physical quantities in all directions of the orthogonal coordinate system XYZ.

(first sensor)
The first sensor 41a can detect physical quantities in one or two directions of the orthogonal coordinate system XYZ. The direction in which the first sensor 41a can detect the physical quantity may be only the X direction, only the Y direction, or only the Z direction. The two directions in which the first sensor 41a can detect a physical quantity may be the X direction and the Y direction (hereinafter sometimes referred to as the XY direction), or the X direction and the Z direction (hereinafter sometimes referred to as the XZ direction). ), or the Y direction and the Z direction (hereinafter sometimes referred to as the YZ direction). Incidentally, when the first sensor 41a can detect a physical quantity in only one direction, it can be said that the first sensor 41a is a uniaxial sensor. On the other hand, when the first sensor 41a can detect physical quantities in two directions, it can be said that the first sensor 41a is a biaxial sensor.

The size of the first sensor 41a is arbitrary. The length and width of the first sensor 41a may be, for example, 10 mm or more and may be 25 mm or less. The thickness of the first sensor 41a may be, for example, 10 mm or more, 25 mm or more, or 10 mm or less.

The shape of the first sensor 41a is arbitrary. As shown in FIG. 3, the first sensor 41a may have a rectangular parallelepiped shape, more specifically, a rectangular plate shape. From another point of view, the thickness of the first sensor 41a may be thinner than the length in the direction orthogonal thereto. The first sensor 41a may have a circular flat plate shape, or may have a rod shape (a shape other than a plate shape).

The first sensor 41 a may be fixed to any location on the bottom surface 61 . For example, the first sensor 41a may be fixed to the first bottom surface 71 with an adhesive. The first sensor 41a may be fixed to the first end 40a side of the central portion of the first bottom surface 71 in the X direction, may be fixed to the central portion of the first bottom surface 71, or may be fixed to the first bottom surface 71. may be fixed closer to the second end 40b than the central portion of.

(Second sensor)
The second sensor 41b can detect physical quantities in one or two directions of the orthogonal coordinate system XYZ. The second sensor 41b can detect the same physical quantity as the first sensor 41a, but in a direction different from the direction in which the physical quantity of the first sensor 41a can be detected. Here, when the second sensor 41b can detect physical quantities in only one direction, it can be said that the second sensor 41b is a uniaxial sensor. On the other hand, when the second sensor 41b can detect physical quantities in two directions, it can be said that the second sensor 41b is a biaxial sensor.

Consider a case where the first sensor 41a can detect physical quantities in two directions, and the first sensor 41a and the second sensor 41b can detect all physical quantities in the XYZ directions. When the first sensor 41a is capable of detecting physical quantities in the XY directions, the second sensor 41b may be capable of detecting physical quantities in the Z direction only, or may detect physical quantities in the X or Y directions in addition to the Z direction. It may be detectable. When the first sensor 41a is capable of detecting physical quantities in the XZ direction, the second sensor 41b may be capable of detecting physical quantities in the Y direction only, or may detect physical quantities in the X or Z direction in addition to the Y direction. It may be detectable. When the first sensor 41a is capable of detecting physical quantities in the YZ directions, the second sensor 41b may be capable of detecting physical quantities in the X direction only, or may detect physical quantities in the Y or Z directions in addition to the X direction. It may be detectable.

When each of the first sensor 41a and the second sensor 41b can detect a physical quantity in two directions, one direction in which the physical quantity of the first sensor 41a can be detected and one direction in which the physical quantity of the second sensor 41b can be detected will overlap each other. Here, the one overlapping direction may be a physical quantity in the X direction, a physical quantity in the Y direction, or a physical quantity in the Z direction. For example, by detecting the physical quantity in a predetermined direction with the first sensor 41a and the second sensor 41b, the physical quantity in this direction can be detected with high accuracy.

Consider a case where the first sensor 41a can detect a physical quantity in one direction, and the first sensor 41a and the second sensor 41b can detect all physical quantities in the XYZ directions. If the first sensor 41a is capable of detecting physical quantities in the X direction only, the second sensor 41b may be capable of detecting physical quantities in the YZ directions. If the first sensor 41a is capable of detecting physical quantities only in the Y direction, the second sensor 41b may be capable of detecting physical quantities in the XZ directions. If the first sensor 41a is capable of detecting physical quantities only in the Z direction, the second sensor 41b may be capable of detecting physical quantities in the XY directions.

The description of the size and shape of the first sensor 41a may be used for the description of the size and shape of the second sensor 41b. Please refer to FIG. The second sensor 41b may be fixed to the seventh wall surface 82d with an adhesive, for example. In this case, it can be said that the seventh wall surface 82d is the fixed wall Fw to which the second sensor 41b is fixed. The second sensor 41b fixed to the seventh wall surface 82d (inner wall 62) may be separated from the second bottom surface 81 (bottom surface 61). From another point of view, a gap Vo may be positioned between the second sensor 41b and the second bottom surface 81 (bottom surface 61). For example, the void Vo may have a size of 1 mm or more, a size of 2 mm or less, or a size of 1 mm or less in the Y direction.

The second sensor 41b may be fixed to the second bottom surface 81 and the seventh wall surface 82d. That is, the gap Vo may not be located between the second sensor 41b and the second bottom surface 81 (bottom surface 61). When the second sensor 41b is fixed to the second bottom surface 81 and the seventh wall surface 82d, positioning of the sensor and positioning of the sensor axis are facilitated.

Please refer to FIG. The second sensor 41b may be located closer to the tip (insert 30) of the main body 50 than the first sensor 41a. For example, the second sensor 41b may be separated from the first sensor 41a by 3 mm or more, 6 mm or more, or 12 mm or more along the X direction.

(wiring)
Please refer to FIGS. The wiring 45 may be electrically connected to the first sensor 41a and the second sensor 41b. The wiring 45 may be connected to the information processing device Ip. The physical quantities detected by the first sensor 41 a and the second sensor 41 b may be input to the information processing device Ip via the wiring 45 . The information processing device Ip will be described below.

(Information processing device)
The information processing device Ip may be installed in the machine tool 1, installed in a space around the machine tool 1, or installed in a location away from the machine tool 1, for example. The information processing device Ip may include, for example, a computer. The computer may include a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), and an external storage device. The information processing device Ip can exhibit various functions by executing programs recorded in the ROM and/or the external storage device by the CPU.

In one aspect, the information processing device Ip may adjust the rotational speed of the work material Ob based on physical quantities detected by the plurality of sensors 41 . In one aspect, the information processing device Ip may adjust the moving speed of the cutting tool 20 that moves up, down, forward, backward, left and right (XYZ directions) based on physical quantities detected by the plurality of sensors 41 . In one aspect, the information processing device Ip may adjust the time until cutting completion displayed on a display (not shown) based on physical quantities detected by the plurality of sensors 41 . The information processing device Ip may combine the above adjustments.

Next, a method of cutting a work material using a cutting tool will be described.

Please refer to FIG. 1 and FIG. FIG. 8 shows each step of the work material cutting method. The work material cutting method may start, for example, from the step of attaching the work material Ob to the machine tool 1 (the step of fixing the work material). After that, for example, the cutting tool 20 may be attached to the machine tool 1 (for example, the tool post 10) (step of fixing the tool). The step of fixing the work material Ob may be performed, for example, after the step of fixing the tool.

After fixing the work material Ob and the cutting tool 20 to the machine tool 1, the cutting tool 20 (insert 30) may be positioned (positioning step). For example, positioning may be performed while confirming the size and/or shape of the work material Ob and the positional relationship between the work material Ob and the cutting tool 20 . The positioning process may be performed manually (visually) or automatically. Next, the work material Ob is rotated via the machine tool 1 (rotation process). While the work material Ob is rotating, the cutting tool 20 may be brought into contact with the work material Ob via the machine tool 1 (cutting process). Specifically, the cutting edge 34 of the insert 30 may be brought into contact with the work material Ob. Then, the work material Ob is cut until it has a desired size and shape.

When the work material Ob has the desired size and shape, the cutting tool 20 may be separated from the work material Ob (step of separating the cutting tool). After that, the rotation of the work material Ob is stopped (stop process), and the work material Ob is removed from the machine tool 1 (work material removal process). Thereby, the cut work material Ob can be obtained.

As described above, the first sensor 41a is fixed to the bottom surface 61 of the recess 60 in this embodiment. Furthermore, the second sensor 41b is fixed to a fixed wall Fw that is part of the inner wall 62 of the recess 60 and faces in a predetermined direction. Therefore, for example, compared to the case where the plurality of sensors 41 are fixed only to the bottom surface 61, the locations and/or orientations of the first sensor 41a and the second sensor 41b can be easily changed. As a result, the degree of freedom of arrangement locations and/or orientations of the plurality of sensors 41 is improved. As a result, in the cutting tool 20 of the present disclosure, the arrangement of the first sensor 41a and the second sensor 41b is advantageous.

In addition, since the plurality of sensors 41 have the first sensor 41a and the second sensor 41b, for example, when detecting physical quantities in three directions of the orthogonal coordinate system XYZ, one sensor detects physical quantities in three directions. detection becomes unnecessary. A sensor capable of detecting a physical quantity in one or two directions is more compact than a sensor capable of detecting a physical quantity in three directions, and may have more options for measurement ranges and/or frequency bands. Especially in directions where the physical quantity cannot be detected, the sensor may be compact. Therefore, by adopting a sensor capable of detecting physical quantities in one direction or two directions, the size of each sensor can be reduced. A plurality of sensors 41 can be arranged even if the concave portion 60 is partially made shallow. In the depth direction of the concave portion 60, it is possible to reduce the decrease in the solid portion of the main body portion 50. Therefore, a rigid cutting tool 20 can be provided.

Furthermore, a sensor capable of detecting physical quantities in three directions of XYZ may have lower detection accuracy than a sensor capable of detecting physical quantities in one or two directions. In the present disclosure, multiple sensors 41 detect physical quantities in the XYZ directions. Therefore, it is not necessary to detect physical quantities in three directions with one sensor. Therefore, it is possible to improve the detection accuracy of the physical quantity in each direction of the orthogonal coordinate system XYZ.

The fixed wall Fw connects the second bottom surface 81 of the inner wall 62 and the outer surface of the main body 50 . Here, the second bottom surface 81 is positioned deeper in the recess 60 than the first bottom surface 71 . Therefore, the concave portion 60 is deep in the area where the second sensor 41b is located and shallow in the area where the first sensor 41a is located. As a result, the first sensor 41a is installed on the first bottom surface 71 so that the first bottom surface 71 and the first sensor 41a face each other in the thickness direction of the first sensor 41a (the direction in which the dimension of the first sensor 41a is small). , the second sensor 41b can be easily installed on the fixed wall Fw so that the fixed wall Fw and the second sensor 41b face each other in the thickness direction of the second sensor 41b. In addition, since the region of the recess 60 where the first bottom surface 71 is located is shallow, the cutting tool 20 having the plurality of sensors 41 located within the recess 60 can be provided with greater rigidity.

In the bottom surface 61, when the length in the direction orthogonal to the X direction (the Z direction in the embodiment) is defined as the width, the width of the portion located closer to the fixed wall Fw than the first sensor 41a is equal to the width of the first sensor 41a. Larger than the width of the fixed part. For example, when the second sensor 41b is fixed to the inner wall 62 on the front end 40a or rear end 40b side of the main body 50, the area where the second sensor 41b is fixed can be widened. As a result, for example, in a mode in which the second sensor 41b is not intended to collide with the inner wall 62, the risk of collision can be reduced. Therefore, when manufacturing the cutting tool 20, it is possible to reduce the possibility that a load (unintended load) is applied to the second sensor 41b.

Please refer to FIG. Between the bottom surface 61 and the inner wall 62 is located a connecting surface 63 that curves and connects them. Since the connecting surface 63 is positioned between the bottom surface 61 and the inner wall 62, excessive load applied to the boundary between the bottom surface 61 and the inner wall 62 can be reduced. As a result, a more durable cutting tool can be provided.

Please refer to FIG. The fixed wall Fw is orthogonal to the bottom surface 61 . Since the fixed wall Fw is orthogonal to the bottom surface 61, the first sensor 41a and the second sensor 41b are arranged in the recess 60 with their thickness directions orthogonal to each other. Thereby, for example, it is possible to easily detect the physical quantity in each direction of the orthogonal coordinate system XYZ.

The fixed wall Fw is orthogonal to the X direction, which is the direction in which the main body 50 extends. As a result, the thickness direction of the second sensor 41b faces the X direction. When the thickness direction of the second sensor 41b faces the X direction side, as a result, when the second sensor 41b can detect physical quantities in two directions of the orthogonal coordinate system XYZ, the second sensor 41b can detect the plane direction (thickness It becomes easy to detect the physical quantity in the YZ direction, which is the physical quantity in the direction orthogonal to the direction. Physical quantities include, for example, acceleration. For example, when cutting the work material Ob, strong acceleration applied in the YZ direction (acceleration due to principal component force, feed component force, etc.) can be detected more accurately.

Please refer to FIG. The fixed wall Fw has a length equal to or less than half the thickness of the main body 50 in the depth direction of the recess 60 . From another point of view, in the depth direction of the recess 60 , the second bottom surface 81 of the recess 60 is positioned closer to the opening of the recess 60 than the central portion of the main body 50 . As a result, more than half of the body portion 50 in the depth direction is solid even in the portion where the recess 60 is formed. As a result, the cutting tool 20 can be reliably fixed to the tool post 10 (machine tool 1). In addition, the durability of the cutting tool 20 with respect to the tool rest 10 can be improved.

Please refer to FIG. The second sensor 41b is located closer to the tip 40a of the main body 50 than the first sensor 41a. In other words, the second sensor 41b is positioned closer to the insert 30 than the first sensor 41a. Thereby, the second sensor 41b fixed to the inner wall 62 can reliably detect a physical quantity such as acceleration caused by the contact of the insert 30 with the work material Ob.

The insert 30 has a first face including a rake face 31a and facing in the Z direction of a Cartesian coordinate system XYZ. Furthermore, the bottom surface 61 of the concave portion 60 faces the Y direction of the orthogonal coordinate system XYZ. As a result, the fixed wall Fw, the first surface 31, and the bottom surface 61 face the X direction, the Y direction, and the Z direction, which are directions orthogonal to each other. As a result, the plurality of sensors 41 composed of the first sensor 41a fixed to the bottom surface 61 and the second sensor 41b fixed to the fixed wall Fw can more easily detect physical quantities in the XYZ directions.

Please refer to FIG. The second sensor 41 b is separated from the bottom surface 61 . This can reduce the load applied to the second sensor 41b in a mode where the second sensor 41b is not intended to receive a load from the bottom surface 61, for example.

Please refer to FIG. 1 and FIG. The work material cutting method according to the present disclosure includes a step of cutting the work material Ob by bringing the cutting tool 20 into contact with the work material Ob. Furthermore, the cutting tool 20 has a holder 40 with a plurality of sensors 41 . Therefore, it is possible to provide a method for cutting a work material that can be cut with a durable cutting tool 20 .

[Second embodiment]
FIG. 9 shows a cross-sectional view of a cutting tool 20A in the second embodiment. 20 A of cutting tools of 2nd Embodiment differ in the point which has the cover 43A which covers several sensors 41 with respect to the cutting tool 20 of 1st Embodiment. Furthermore, the cutting tool 20A of the second embodiment also differs in the shape of the concave portion 60A. The holder 40A including the cover 43A and the recess 60A will be described below. In addition, about the part which is common in 1st Embodiment, a code|symbol is diverted and detailed description is abbreviate|omitted.

(holder)
The holder 40A includes a main body 50 having a recess 60A (a first recess 70A and a second recess 70B), a plurality of sensors 41 positioned inside the main body 50, and a plurality of sensors 41 covering the recess 60A. and wiring 45 electrically connected to the plurality of sensors 41 .

(recess)
The recessed portion 60A may have a notch portion 60Ad that lacks a part of the main body portion 50 along the opening portion of the recessed portion 60A. The notch portion 60Ad may be a portion that lacks the vicinity of the opening portion of the main body portion 50 over the circumferential direction. From another point of view, the notch 60Ad may be a portion with a large diameter located at the opening of the recess 60A.

(cover)
The cover 43A may be fitted into the recess 60A (notch 60Ad). Such a cover 43A may be slightly smaller in size than the recess 60A when the recess 60A is viewed from the front. Furthermore, the shape of the cover 43A may be the same as the shape of the concave portion 60A viewed from the front. In the example shown in FIG. 9, the cover 43A fitted into the recess 60A covers the first sensor 41a and the second sensor 41b positioned inside the recess 60A.

Any material can be used for the cover 43A. The material of the cover 43A is, for example, an organic material such as resin, an inorganic material such as glass, or a metal such as steel, cast iron, or stainless steel. The material of the cover 43A may be the same as the material of the body portion 50 .

[Third embodiment]
Please refer to FIG. FIG. 10 shows a cross-sectional view of a cutting tool 20B in the third embodiment. A cutting tool 20B of the third embodiment differs from the cutting tool 20 of the first embodiment in that it has a wireless communication section 42B and a sealing section 44B for sealing a plurality of sensors 41 . In addition, about the part which is common in 1st Embodiment, a code|symbol is diverted and detailed description is abbreviate|omitted.

(holder)
As shown in FIG. 10, the holder 40B includes a body portion 50 having a recess 60, a plurality of sensors 41 positioned inside the body portion 50, and a wireless sensor electrically connected to the plurality of sensors 41. It may have a communication unit 42B and a sealing unit 44B that seals the plurality of sensors 41 and the wireless communication unit 42B.

(Wireless communication part)
The wireless communication unit 42B may be, for example, a device capable of transmitting physical quantities detected by the first sensor 41a and the second sensor 41b to an external device (for example, the information processing device Ip). The physical quantities detected by the first sensor 41a and the second sensor 41b may be input to the wireless communication unit 42B via the wiring 45 and input to the information processing device Ip from the wireless communication unit 42B.

(sealing part)
The sealing portion 44B may be positioned within the recess 60 to seal the first sensor 41a, the second sensor 41b and the wireless communication portion 42B. The sealing portion 44B may be entirely positioned within the recess 60 . Since the entirety of the sealing portion 44B is positioned within the recess 60, the sealing portion 44B approaches the work material Ob (see FIG. 1) more than necessary when cutting the work material Ob (see FIG. 1). is suppressed. However, a portion of the sealing portion 44B may be positioned outside the recess 60 . The material of the sealing portion 44B may be acrylic resin, for example.

[Fourth embodiment]
Please refer to FIG. FIG. 11 shows a perspective view of a cutting tool 20C (holder 40C) according to the fourth embodiment. 20 C of cutting tools of 3rd Embodiment differ in the number of the sensors which several sensor 41C has compared with the cutting tool 20 of 1st Embodiment. For parts common to the first embodiment, reference numerals are used and detailed explanations are omitted.

(multiple sensors)
As shown in FIG. 11, the multiple sensors 41C may include a first sensor 41a, a second sensor 41b, and a third sensor 41Cc. The first sensor 41a, the second sensor 41b, and the third sensor 41Cc shown in FIG. 11 may be sensors capable of detecting physical quantities in only one direction of the orthogonal coordinate system XYZ. For example, the first sensor 41a may detect a physical quantity in the X direction, the second sensor 41b may detect a physical quantity in the Z direction, and the third sensor 41Cc may detect a physical quantity in the Y direction. The first to third sensors 41a, 41b, 41Cc are arranged so as to detect all physical quantities in the XYZ directions.

The third sensor 41Cc may be positioned inside the first recess 70 or inside the second recess 80 . When the third sensor 41Cc is positioned inside the second recess 80, the third sensor 41Cc may be fixed to the second bottom surface 81, the fourth wall surface 82a, or the fifth wall surface 82b. May be fixed.

The cutting tool, cutting structure, information processing device, and holder in the present disclosure are not limited to the above-described embodiments and modifications, and may be implemented in various forms. Several examples in which the shapes of the cutting tool, cutting structure, information processing device, and holder are modified will be introduced below.

For example, in embodiments, the illustrated cutting tool is left-handed. However, the cutting tools in this disclosure are not limited to left-handed. That is, the cutting tools of the present disclosure are applicable to both right-handed applications and handless applications that can be used in both right-handed and left-handed applications.

For example, in the embodiment, an example in which the concave portion is configured by the first concave portion and the second concave portion has been described. However, the recess may be constituted by a first recess, a second recess and a third recess. In addition, when the recessed portion is composed of the first recessed portion and the second recessed portion, the recessed portion may be configured in such a manner that the first recessed portion and the second recessed portion cannot be distinguished from each other.

For example, the location where the wireless communication unit shown in the third embodiment is accommodated is not limited to the recess opened in the location shown in the embodiment. For example, the recess in which the wireless communication unit is accommodated may be a recess (fourth recess) other than the recess shown in the drawing. In this case, the position where the fourth recess is opened is arbitrary.

Furthermore, the wireless communication section shown in the third embodiment may be applied to the first, second and fourth embodiments. Additionally, the cover shown in the second embodiment may be applied to the first, third and fourth embodiments.

20... Cutting tool 30... Insert 31... First surface 40... Holder 40a... Tip (first end)
40b... rear end (second end)
41 Plural sensors 41a First sensor 41b Second sensor 50 Body part 55 Pocket 60 Recess 61 Bottom surface 62 Inner wall 71 First bottom surface 82 Second bottom surface Fw Fixed wall Ob Work material

Claims (13)

a main body portion extending along the X direction of an orthogonal coordinate system XYZ, having a pocket at the tip, and having a recess opening on the outer surface on the rear end side of the pocket;
a cutting insert located in the pocket;
a plurality of sensors positioned within the recess;
has
the recess has a bottom surface and an inner wall positioned between the bottom surface and the outer surface of the main body;
The plurality of sensors are
a first sensor fixed to the bottom surface;
a second sensor fixed to a fixed wall that is part of the inner wall and faces in a predetermined direction;
has
The bottom surface is
a first bottom surface to which the first sensor is fixed;
a second bottom surface adjacent to the first bottom surface and located deeper in the recess than the first bottom surface;
has
The fixed wall connects the second bottom surface of the inner wall and the outer surface of the main body.
Cutting tools. the fixed wall is located closer to the front end side or the rear end side of the main body than the first sensor;
The width of the portion of the bottom surface located closer to the fixed wall than the first sensor is the width of the portion to which the first sensor is fixed, when the length in the direction orthogonal to the X direction is defined as the width. A cutting tool according to claim 1 which is larger. a main body portion extending along the X direction of an orthogonal coordinate system XYZ, having a pocket at the tip, and having a recess opening on the outer surface on the rear end side of the pocket;
a cutting insert located in the pocket;
a plurality of sensors positioned within the recess;
has
the recess has a bottom surface and an inner wall positioned between the bottom surface and the outer surface of the main body;
The plurality of sensors are
a first sensor fixed to the bottom surface;
a second sensor fixed to a fixed wall that is part of the inner wall and faces in a predetermined direction;
has
the fixed wall is located closer to the front end side or the rear end side of the main body than the first sensor;
The width of the portion of the bottom surface located closer to the fixed wall than the first sensor is the width of the portion to which the first sensor is fixed, when the length in the direction orthogonal to the X direction is defined as the width. greater than
Cutting tools. The cutting tool according to any one of claims 1 to 3, wherein a curved connection surface connecting the bottom surface and the inner wall is positioned between the bottom surface and the inner wall. The cutting tool according to any one of claims 1 to 4, wherein the fixed wall is perpendicular to the bottom surface. The cutting tool according to any one of claims 1 to 5, wherein the fixed wall is orthogonal to the X direction of the orthogonal coordinate system XYZ. The cutting tool according to any one of claims 1 to 6, wherein the fixed wall has a length in the depth direction of the recess that is 1/2 or less of the thickness of the main body. The cutting tool according to any one of claims 1 to 7, wherein the second sensor is located closer to the distal end of the main body than the first sensor. The cutting insert has a first surface including a rake face and facing the Z direction of the Cartesian coordinate system XYZ,
9. The cutting tool according to claim 7 or 8, wherein said bottom surface of said recess faces the Y direction of said orthogonal coordinate system XYZ. The cutting tool according to any one of claims 1 to 9, wherein the second sensor is separated from the bottom surface. The first sensor is capable of detecting physical quantities in one or two directions of the orthogonal coordinate system XYZ,
The second sensor is capable of detecting the physical quantity in one or two directions in the orthogonal coordinate system XYZ, and at least a part of the direction is a different direction from the first sensor. A cutting tool according to any one of the preceding claims. rotating the work material;
A step of bringing the cutting tool according to any one of claims 1 to 11 into contact with the rotating work material to cut the work material;
separating the cutting tool from the cut work material;
A work material cutting method. a rod-shaped main body having a pocket at the tip and a recess opening on the outer surface on the rear end side of the pocket;
a plurality of sensors positioned within the recess;
has
the recess has a bottom surface and an inner wall connecting the bottom surface and the outer surface of the main body,
The plurality of sensors are
A cutting tool holder, comprising: a first sensor fixed to the bottom surface; and a second sensor fixed to a fixed wall that is part of the inner wall and faces in a predetermined direction.

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