Turning Tools

Abstract

The turning tool includes a rod-shaped main body having a tip end for holding a cutting tip and a base end that is an end opposite the tip end in the longitudinal direction, and a strain sensor installed in the main body. The main body includes a first portion including the base end, and a second portion that is formed continuous with the first portion at a position separated in the longitudinal direction from the base end and has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion. The strain sensor is located on the tip end side of the boundary between the first portion and the second portion in the longitudinal direction of the main body.

Description

[Technical field]

[0001] The present disclosure relates to turning tools. [Background technology]

[0002] A technology is known in which the state of a turning tool is grasped by measuring the strain of the turning tool using a strain sensor during machining with the turning tool (see, for example, International Publication No. WO 2022 / 230148 (Patent Document 1)). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 230148 Summary of the Invention

[0004] A turning tool according to the present disclosure includes a rod-shaped main body having a tip end for holding a cutting tip and a base end that is an end opposite the tip end in the longitudinal direction, and a strain sensor installed in the main body. The main body includes a first portion including the base end, and a second portion that is formed continuous with the first portion at a position spaced apart from the base end in the longitudinal direction and has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion. The strain sensor is located on the tip side of the boundary between the first and second portions in the longitudinal direction of the main body. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is a schematic perspective view showing a structure of a turning tool in the first embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing the structure of the turning tool in the first embodiment. [Diagram 3] FIG. 3 is a schematic perspective view showing the structure of the turret. [Figure 4] FIG. 4 is a schematic perspective view showing a state in which a turning tool is held by the turret. [Diagram 5] FIG. 5 is a schematic perspective view showing a structure of a turning tool in the second embodiment. [Figure 6] FIG. 6 is a schematic cross-sectional view showing a structure of a turning tool in the second embodiment. [Figure 7] FIG. 7 is a schematic perspective view showing a structure of a turning tool in the third embodiment. [Figure 8] FIG. 8 is a schematic cross-sectional view showing a structure of a turning tool in the third embodiment. [Figure 9] FIG. 9 is a schematic perspective view showing a structure of a turning tool in the fourth embodiment. [Figure 10] FIG. 10 is a schematic cross-sectional view showing the structure of a turning tool in the fourth embodiment. [Figure 11] FIG. 11 is a schematic perspective view showing a structure of a turning tool according to the fifth embodiment. [Figure 12] FIG. 12 is a schematic cross-sectional view showing the structure of a turning tool in the fifth embodiment. [Figure 13] FIG. 13 is a schematic perspective view showing a structure of a turning tool according to the sixth embodiment. [Figure 14] FIG. 14 is a schematic cross-sectional view showing the structure of a turning tool in the sixth embodiment. [Figure 15] FIG. 15 is a schematic perspective view showing a structure of a turning tool according to the seventh embodiment. [Figure 16] FIG. 16 is a schematic cross-sectional view showing the structure of a turning tool in the seventh embodiment. [Figure 17] FIG. 17 is a schematic cross-sectional view showing the structure of a turning tool in the seventh embodiment. [Figure 18] FIG. 18 is a schematic perspective view showing a structure of a turning tool according to the eighth embodiment. [Figure 19] FIG. 19 is a schematic cross-sectional view showing a structure of a turning tool in the eighth embodiment. [Figure 20] FIG. 20 is a schematic perspective view showing the structure of a turning tool in the ninth embodiment. [Figure 21] FIG. 21 is a schematic cross-sectional view showing the structure of a turning tool in the ninth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] [Problem that this disclosure aims to solve] In order to measure the strain of the turning tool, for example, a strain sensor can be installed on the main body of the turning tool. The main body of the turning tool is held by a holding mechanism of the machine tool. However, according to the study by the present inventors, there are cases where a problem occurs in that the measured strain value is not stable. Specifically, even when the same machining is performed using the same turning tool, the measured strain value may differ beyond the normal error range. In this way, if the measured strain value is not stable, for example, when detecting an abnormality of the turning tool from the measured strain value, there is a problem in that it is difficult to set a threshold value for determining an abnormality.

[0007] It is an object of the present disclosure to provide a turning tool capable of stabilizing the value of the measured strain.

[0008] [Effects of this disclosure] According to the turning tool of the present disclosure, the measured strain value can be stabilized.

[0009] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be described. The turning tool of the present disclosure includes a rod-shaped main body having a tip end for holding a cutting tip and a base end that is an end opposite to the tip end in the longitudinal direction, and a strain sensor installed in the main body. The main body includes a first portion including the base end, and a second portion that is formed in a position separated from the base end in the longitudinal direction and connected to the first portion, and has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion. The strain sensor is located on the tip side of the boundary between the first portion and the second portion in the longitudinal direction of the main body.

[0010] The present inventors have studied the cause of the instability of the measured strain value when a strain sensor is installed on the main body of a turning tool. As a result, they have found that the strain value varies when the area where the strain sensor is installed on the main body is constrained by the holding mechanism of the machine tool, and the measured strain value is stable when the area where the strain sensor is installed is not constrained by the holding mechanism of the machine tool. This is thought to be because when the area where the strain sensor is installed on the main body is constrained by the holding mechanism of the machine tool, the manner of constraining by the holding mechanism affects the measured strain value, whereas when the area is not constrained, the influence of the manner of constraining by the holding mechanism on the measured strain value is small.

[0011] In the turning tool of the present disclosure, the main body includes a second portion having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion. The strain sensor is disposed on the tip side of the boundary between the first portion and the second portion in the longitudinal direction of the main body. The second portion having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion prevents the turning tool from being held by the holding mechanism of the machine tool. Therefore, when the turning tool is held by the holding mechanism, the first portion located on the base end side of the second portion is held, and the area of ​​the main body on the tip side of the boundary between the first portion and the second portion is not constrained by the holding mechanism. Then, the area of ​​the main body where the strain sensor is disposed is not constrained by the holding mechanism. As a result, the value of the strain measured by the strain sensor is stabilized. In this way, according to the turning tool of the present disclosure, the value of the strain measured can be stabilized.

[0012] In the turning tool of the present disclosure, the body may further include a third portion formed to include the tip portion and having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion. The second portion may be a region including a protrusion formed on the outer circumferential surface of the body between the base end portion and the third portion in the longitudinal direction of the body, spaced apart from the third portion. In this way, by forming a region including a protrusion on the outer circumferential surface of the body as the second portion, it is possible to easily achieve a state in which the region on the tip side of the boundary between the first and second portions of the body is not restrained by the holding mechanism.

[0013] In the turning tool of the present disclosure, the body may include a plurality of flat portions. The protrusions may be formed on a first annular line formed by an intersection of a plane perpendicular to the longitudinal direction of the body and a surface of the body, and on the same plane among the plurality of flat surfaces. This configuration can more reliably achieve a state in which the region on the tip side of the boundary between the first and second parts of the body is not restrained by the retaining mechanism.

[0014] In the turning tool of the present disclosure, the protrusions may be formed on each of the flat surfaces of the flat surfaces, which makes it possible to more reliably achieve a state in which the region of the body on the tip side of the boundary between the first and second parts is not restrained by the holding mechanism.

[0015] In the turning tool of the present disclosure, the body may further include a third portion formed to include the tip portion and having a cross-sectional area perpendicular to the longitudinal direction larger than that of the first portion. The second portion may be connected to the third portion in the longitudinal direction of the body. This configuration also makes it possible to easily achieve a state in which the region of the body on the tip side of the boundary between the first and second portions is not restrained by the holding mechanism.

[0016] In the turning tool of the present disclosure, a first recess may be formed on the outer circumferential surface of the main body. The strain sensor may be housed in the first recess. By housing the strain sensor in the recess in this manner, handling of the turning tool becomes easy.

[0017] In the turning tool of the present disclosure, a second recess may be formed on the outer peripheral surface of the main body. The strain sensor may be arranged to straddle the second recess. By including a second portion having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion, the rigidity of the main body is increased, and the value of strain generated in the area of ​​the main body where the strain sensor is installed is reduced. In contrast, by forming a second recess in the main body, the strain around the second recess can be amplified. And by arranging the strain sensor to straddle the second recess, it becomes easier for the strain sensor to detect strain.

[0018] In the turning tool of the present disclosure, a pair of third recesses may be formed on the outer peripheral surface of the main body, the pair being arranged side by side along a second annular line formed by the intersection of a plane perpendicular to the longitudinal direction of the main body and the surface of the main body. The strain sensor may be arranged between the pair of third recesses. By forming the third recesses in the main body, strain around the third recesses can be amplified. And, by arranging the strain sensor between the third recesses, it becomes easier to detect strain by the strain sensor.

[0019] [Details of the embodiment of the present invention] Next, an embodiment of a turning tool according to the present disclosure will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0020] (Embodiment 1)

[0021] (1) Structure of the main body Fig. 1 is a schematic perspective view showing the structure of a turning tool in embodiment 1. Fig. 2 is a schematic cross-sectional view showing the structure of a turning tool in embodiment 1. Fig. 2 shows a cross section along line II-II in Fig. 1 (a cross section in the XZ plane, which is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10).

[0022] 1, a turning tool 1 of the present embodiment includes a rod-shaped main body 10 extending from a tip end 10A to a base end 10B. In this specification, the direction extending from the tip end 10A to the base end 10B, i.e., the longitudinal direction of the main body 10, is the Y direction. The width direction of the main body 10 perpendicular to the Y direction is the X direction. The height direction of the main body 10 perpendicular to the X and Y directions is the Z direction.

[0023] The main body 10 is made of metal. The main body 10 includes a first surface 10C, a second surface 10D, a third surface 10E, a fourth surface 10F, and a fifth surface 10G. The first surface 10C and the fourth surface 10F are planes along the XY plane. The first surface 10C and the fourth surface 10F are parallel. The second surface 10D and the third surface 10E are planes along the YZ plane. The second surface 10D and the third surface 10E are parallel. The first surface 10C and the fourth surface 10F are perpendicular to the second surface 10D and the third surface 10E. The first surface 10C, the second surface 10D, the third surface 10E, and the fourth surface 10F constitute the outer peripheral surface of the main body 10. The fifth surface 10G is a plane along the XZ plane. The fifth surface 10G is perpendicular to the first surface 10C, the second surface 10D, the third surface 10E, and the fourth surface 10F. The fifth surface 10G is an end surface on the base end portion 10B side of the main body portion 10. Although the shape of the main body portion of the present disclosure is not particularly limited, the main body portion 10 in the present embodiment has a rectangular parallelepiped shape.

[0024] As shown in FIG. 1, a recess for holding a cutting tip 90 is formed in the tip 10A of the main body 10. The cutting tip 90 and a base plate 81 are arranged in this recess. The cutting tip 90 is arranged in a stacked manner on the base plate 81. A fixing part 82 for fixing the cutting tip 90 is arranged near the tip 10A of the main body 10. The cutting tip 90 is held by being sandwiched between the base plate 81 and the fixing part 82. The cutting tip 90 is detachably fixed by the rotatable fixing part 82. That is, the cutting tip 90 is held in the tip 10A of the main body 10. The turning tool 1 is a cutting tool that cuts a workpiece by contacting the cutting tip 90 with the rotating workpiece. That is, the turning tool 1 is a cutting tool used for turning.

[0025] Referring to Figures 1 and 2, the main body 10 includes a first portion 11 including a base end 10B, a second portion 12 formed to be connected to the first portion 11 at a position away from the base end 10B in the longitudinal direction (Y direction) and having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11, and a third portion 13 formed to include the tip end 10A and having a larger cross-sectional area perpendicular to the longitudinal direction (Y direction) than the first portion 11.

[0026] The second portion 12 is an area including a protrusion 12A formed on the outer peripheral surface of the main body 10, more specifically, on the first surface 10C, between the base end portion 10B and the third portion 13 in the longitudinal direction (Y direction) of the main body 10, away from the third portion 13. The shape of the protrusion 12A is not particularly limited, but in this embodiment, it has a rectangular parallelepiped shape. With reference to FIG. 2, the protrusion 12A is a portion that protrudes from the area surrounded by the outer edge 11A of the first portion 11 when viewed in the longitudinal direction (Y direction) of the main body 10. That is, the second portion 12 is an area having a portion that protrudes from the area surrounded by the outer edge 11A of the first portion 11 when viewed in the longitudinal direction (Y direction) of the main body 10.

[0027] In this embodiment, there are a plurality of (two) protrusions 12A. Referring to Fig. 1, these two protrusions 12A are formed on a first annular line β formed by the intersection of a plane α perpendicular to the longitudinal direction of the main body 10 and the surface of the main body 10, and are formed side by side on a first surface 10C of the plurality of flat surfaces constituting the surface of the main body 10.

[0028] (2) Sensor module structure 1 and 2, the turning tool 1 is provided with a sensor module 40 including a strain sensor 41. The sensor module 40 includes the strain sensor 41 and a wiring portion 42 electrically connected to the strain sensor 41. The strain sensor 41 has a rectangular plate shape. The wiring portion 42 has a strip shape. The strain sensor 41 is disposed on the wiring portion 42.

[0029] (3) Strain sensor placement A first recess 18 is formed in a first surface 10C, which is a part of the outer circumferential surface of the main body 10. The first recess 18 is formed to include an area sandwiched between a pair of protrusions 12A. A sensor module 40 including a strain sensor 41 is housed in the first recess 18. That is, the turning tool 1 includes the strain sensor 41 installed in the main body 10.

[0030] 2, the first recess 18 is filled with a filler 15. The filler 15 is made of, for example, resin. The sensor module 40 is arranged so as not to be exposed from the filler 15. This prevents cutting fluid and the like from coming into contact with the sensor module 40 when the turning tool 1 is used for turning. Instead of or in addition to the filler 15, a cover member (not shown) that closes the opening of the first recess 18 may be provided on the main body 10.

[0031] 1, the strain sensor 41 is disposed on the tip end 10A side of a boundary γ between the first portion 11 and the second portion 12 in the longitudinal direction (Y direction) of the main body 10. In this embodiment, the entire sensor module 40 including the strain sensor 41 is disposed on the tip end 10A side of the boundary γ. It is sufficient that the entire strain sensor 41 is disposed on the tip end 10A side of the boundary γ, and a part of the wiring portion 42 may be disposed on the base end 10B side of the boundary γ.

[0032] (4) Fixing the turning tool to the machine tool The turning tool 1 can be used while being fixed to the machine tool in various ways. For example, the turning tool 1 is fixed to a turret, which is a holding mechanism of the machine tool, in the following manner. FIG. 3 is a schematic perspective view showing the structure of the turret. FIG. 4 is a schematic perspective view showing a state in which the turning tool is held by the turret. Referring to FIG. 3, a groove 141 for holding the turning tool 1 is formed in a turret 140, which is a holding mechanism included in a machine tool (not shown). The turret 140 includes a bottom wall 142 and a pair of side walls 143 rising from the bottom wall 142. The bottom wall 142 and the side walls 143 define the groove 141. The turning tool 1 is fixed in the groove 141 of the turret 140 by using a first fixing member 150, a second fixing member 160, and screws 169A and 169C.

[0033] Specifically, the first fixing member 150 has a pair of end faces 155 having a trapezoidal shape, and a shape including a top face 151, a bottom face 152, a first side face 153, and a second side face 154 each having a rectangular shape and arranged perpendicular to the pair of end faces 155 so as to connect the pair of end faces 155. Of the parallel sides of the end face 155 having a trapezoidal shape, the side connected to the top face 151 is shorter than the side connected to the bottom face 152. The second fixing member 160 has a pair of end faces 165 having a trapezoidal shape, and a top face 161, a bottom face 162, a first side face 163, and a second side face 164 each having a rectangular shape and arranged perpendicular to the pair of end faces 165 so as to connect the pair of end faces 165. Of the parallel sides of the end face 165 having a trapezoidal shape, the side connected to the top face 161 is longer than the side connected to the bottom face 162. The second fixing member 160 has screw holes 165A, 165B, and 165C formed therein, which penetrate from the top surface 161 to the bottom surface 162.

[0034] 3 and 4, the first fixing member 150 is disposed so that the bottom surface 152 contacts the bottom wall 142 of the turret 140 and the first side surface 153 contacts the side wall 143 of the turret 140. The turning tool 1 is disposed so that the third surface 10E contacts the bottom wall 142 of the turret 140 and the fourth surface 10F contacts the side wall 143 of the turret 140. The second fixing member 160 is disposed so that the first side surface 163 contacts the second side surface 154 of the first fixing member 150 and the second side surface 164 contacts the first surface 10C of the turning tool 1. The second fixing member 160 is disposed so that the bottom surface 162 faces the bottom wall 142 of the turret 140. Then, screws 169A and 169C are arranged so as to pass through screw holes 165A and 165C of second fixing member 160, respectively, and be inserted into screw holes (not shown) formed in bottom wall 142 of turret 140. Screw 169B is inserted into screw hole 165B of second fixing member 160. By tightening screws 169A and 169C, the distance between bottom surface 162 of second fixing member 160 and bottom wall 142 of turret 140 is reduced. In this way, second fixing member 160 functions as a shim, and turning tool 1 is firmly fixed to turret 140.

[0035] On the other hand, when removing the turning tool 1 from the turret 140, the screw 169B is screwed into the screw hole 165B. The screw 169B penetrates the screw hole 165B, and its tip comes into contact with the bottom wall 142. When the screw 169B is further screwed, the second fixing member 160 moves relative to the turret 140 so that the distance between the bottom surface 162 and the bottom wall 142 increases. This makes it possible to easily remove the second fixing member 160. When the second fixing member 160 is removed, the fixing of the turning tool 1 to the turret 140 is released, and the turning tool 1 can be easily removed from the turret 140. Note that, in the above, an example has been described in which the turning tool 1 is fixed to the holding mechanism (turret 140) of the machine tool using a fixing member having a wedge shape, but the method of fixing the turning tool 1 to the machine tool is not limited to this. For example, the turning tool 1 may be fixed by screwing a bolt through a part of the machine tool's holding mechanism so that the tip of the bolt contacts the turning tool 1, or a plate-shaped member may be interposed between the tip of the bolt and the turning tool 1, and the bolt may be screwed in so that the tip of the bolt contacts the plate-shaped member, thereby pressing the plate-shaped member against the turning tool 1 and fixing it.

[0036] (5) Operation of turning tool 1 to 4, when the turning tool 1 is in operation, the turning tool 1 machines the rotating workpiece by contacting the workpiece with the cutting tip 90. At this time, the strain of the main body 10 is detected by the strain sensor 41. The signal containing the strain information detected by the strain sensor 41 is an analog signal. The strain information, which is an analog signal, is converted to a digital signal by an AD converter (not shown) installed in the main body 10, and then transmitted to a wireless communication unit (not shown) and then to the outside. This signal is received and analyzed outside to grasp the state of the turning tool 1.

[0037] (6) Effects of this embodiment In the turning tool 1 of this embodiment, the main body 10 includes the second portion 12 having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11. The strain sensor 41 is disposed on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 in the longitudinal direction (Y direction) of the main body 10. The second portion 12 (projection 12A) having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11 hinders holding by the turret 140, which is a holding mechanism of the machine tool. Therefore, when the turning tool 1 is held by the turret 140, the first portion 11 located on the base end portion 10B side than the second portion 12 is held, and the area of ​​the main body 10 on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 is not constrained by the turret 140. Then, the area of ​​the main body 10 where the strain sensor 41 is disposed is not constrained by the turret 140. As a result, there is a stable value of the strain measured by the strain sensor 41. In this manner, the turning tool 1 of the present embodiment is a turning tool capable of stabilizing the value of the strain measured.

[0038] (Embodiment 2) Next, a second embodiment, which is another embodiment, will be described. FIG. 5 is a schematic perspective view showing the structure of a turning tool in the second embodiment. FIG. 6 is a schematic cross-sectional view showing the structure of a turning tool in the second embodiment. FIG. 6 shows a cross section along line segment VI-VI in FIG. 5 (a cross section in the XZ plane, which is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10). The turning tool 1 in the second embodiment basically has the same structure as the turning tool 1 in the first embodiment, and achieves the same effects. However, the turning tool 1 in the second embodiment differs from the turning tool 1 in the first embodiment in the arrangement of the protrusion 12A, the first recess 18, and the sensor module 40.

[0039] Specifically, the protrusion 12A and the first recess 18 of the turning tool 1 of the second embodiment are formed on the third surface 10E of the main body 10. The sensor module 40 is accommodated in the first recess 18, and is thereby disposed on the third surface 10E of the main body 10.

[0040] Even when such a structure is adopted, as in the first embodiment, the second portion 12 (projection 12A) having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11 prevents the first portion 12 from being held by the turret 140, which is a holding mechanism of the machine tool, and the area of ​​the body 10 on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 is not restrained by the turret 140. As a result, the value of the strain measured by the strain sensor 41 becomes stable. In this way, the turning tool 1 of this embodiment is a turning tool that can stabilize the value of the strain to be measured.

[0041] (Embodiment 3) Next, a third embodiment, which is yet another embodiment, will be described. FIG. 7 is a schematic perspective view showing the structure of a turning tool in the third embodiment. FIG. 8 is a schematic cross-sectional view showing the structure of a turning tool in the third embodiment. FIG. 8 shows a cross section along line VIII-VIII in FIG. 7 (a cross section in the XZ plane, which is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10). The turning tool 1 in the third embodiment basically has the same structure as the turning tool 1 in the first embodiment, and achieves the same effects. However, the turning tool 1 in the third embodiment is different from the turning tool 1 in the first embodiment in the arrangement of the protrusion 12A, the first recess 18, and the sensor module 40.

[0042] Specifically, the protrusion 12A and the first recess 18 of the turning tool 1 of the third embodiment are formed on the fourth surface 10F of the main body 10. The sensor module 40 is accommodated in the first recess 18, and is thereby disposed on the fourth surface 10F of the main body 10.

[0043] Even when such a structure is adopted, as in the first embodiment, the second portion 12 (projection 12A) having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11 prevents the first portion 12 from being held by the turret 140, which is a holding mechanism of the machine tool, and the area of ​​the body 10 on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 is not restrained by the turret 140. As a result, the value of the strain measured by the strain sensor 41 becomes stable. In this way, the turning tool 1 of this embodiment is a turning tool that can stabilize the value of the strain to be measured.

[0044] (Embodiment 4) Next, a fourth embodiment, which is yet another embodiment, will be described. FIG. 9 is a schematic perspective view showing the structure of a turning tool in the fourth embodiment. FIG. 10 is a schematic cross-sectional view showing the structure of a turning tool in the fourth embodiment. FIG. 10 shows a cross section along the line XX in FIG. 9 (a cross section in the XZ plane, which is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10). FIG. 9 and FIG. 10 are views corresponding to FIG. 1 and FIG. 2 of the first embodiment, respectively. The turning tool 1 in the fourth embodiment basically has the same structure as the turning tool 1 in the first embodiment, and achieves the same effects. However, the turning tool 1 in the fourth embodiment is different from the turning tool 1 in the first embodiment in the arrangement of the protrusion 12A, the first recess 18, and the sensor module 40.

[0045] Specifically, the projections 12A of the turning tool 1 of the fourth embodiment are formed on the first surface 10C, the third surface 10E, and the fourth surface 10F of the main body 10. That is, in this embodiment, the projections 12A are formed on each of the three flat surfaces of the first surface 10C, the second surface 10D, the third surface 10E, and the fourth surface 10F, which are the flat surfaces (outer peripheral surfaces) constituting the main body 10. A first recess 18 is formed between the projections 12A formed on the first surface 10C, the third surface 10E, and the fourth surface 10F, two each. The first recess 18 is formed on the first surface 10C, the third surface 10E, and the fourth surface 10F. The sensor module 40 is accommodated in each of the first recesses 18, and is disposed on the first surface 10C, the third surface 10E, and the fourth surface 10F of the main body 10. That is, in this embodiment, a plurality of (three) sensor modules 40 are arranged in the main body 10.

[0046] Even when such a structure is adopted, as in the first embodiment, the second part 12 (projection 12A) having a larger cross-sectional area perpendicular to the longitudinal direction than the first part 11 hinders holding by the turret 140, which is a holding mechanism of the machine tool, and the area of ​​the body part 10 on the tip part 10A side of the boundary γ between the first part 11 and the second part 12 is not restrained by the turret 140. As a result, the value of the strain measured by the strain sensor 41 is stabilized. In this way, the turning tool 1 of this embodiment is a turning tool that can stabilize the value of the strain measured. Also, in this embodiment, multiple (three) sensors 41 are installed on different outer peripheral surfaces of the body part 10. As a result, the state of the strain in the body part 10 can be grasped in more detail.

[0047] (Embodiment 5) Next, a fifth embodiment, which is yet another embodiment, will be described. FIG. 11 is a schematic perspective view showing the structure of a turning tool in the fifth embodiment. FIG. 12 is a schematic cross-sectional view showing the structure of a turning tool in the fifth embodiment. FIG. 12 shows a cross section along line segment XII-XII in FIG. 11 (a cross section in the XZ plane, which is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10). FIG. 11 and FIG. 12 are views corresponding to FIG. 1 and FIG. 2 of the first embodiment, respectively. The turning tool 1 in the fifth embodiment basically has the same structure as the turning tool 1 in the first embodiment, and exerts the same effect. However, the turning tool 1 in the fifth embodiment is different from the turning tool 1 in the first embodiment in the structure of the second portion 12.

[0048] Specifically, the second part 12 of the turning tool 1 of the fifth embodiment includes a pair of extension parts 12C formed on the first surface 10C and extending along the Y direction, and a connection part 12D arranged on the third part 13 side as viewed from the extension parts 12C and connecting the pair of extension parts 12C. The thickness (height in the Z direction) of the pair of extension parts 12C and the connection part 12D is constant over the entire area. The connection part 12D is connected to the third part 13. That is, in this embodiment, the second part 12 is connected to the third part 13 in the longitudinal direction of the main body part 10. The first recess 18 is formed in an area sandwiched between the pair of extension parts 12C. The sensor module 40 is accommodated in the first recess 18 and is arranged on the first surface 10C of the main body part 10.

[0049] Even when such a structure is adopted, as in the first embodiment, the second portion 12, which has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11, prevents the second portion 12 from being held by the turret 140, which is a holding mechanism of the machine tool, and the area of ​​the body 10 on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 is not restrained by the turret 140. As a result, the value of the strain measured by the strain sensor 41 becomes stable. In this way, the turning tool 1 of this embodiment is a turning tool that can stabilize the value of the strain to be measured.

[0050] (Embodiment 6) Next, a sixth embodiment, which is yet another embodiment, will be described. FIG. 13 is a schematic perspective view showing the structure of a turning tool in the sixth embodiment. FIG. 14 is a schematic cross-sectional view showing the structure of a turning tool in the sixth embodiment. FIG. 14 shows a cross section along line segment XIV-XIV in FIG. 13 (a cross section in the XZ plane, which is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10). FIG. 13 and FIG. 14 are views corresponding to FIG. 11 and FIG. 12 of the fifth embodiment, respectively. The turning tool 1 in the sixth embodiment basically has the same structure as the turning tool 1 in the fifth embodiment, and exerts the same effect. However, the turning tool 1 in the sixth embodiment is different from the turning tool 1 in the fifth embodiment in the shapes of the extension portion 12C and the connection portion 12D.

[0051] Specifically, the thickness (height in the Z direction) of the connection portion 12D of the turning tool 1 of the sixth embodiment decreases with increasing distance from the third portion 13 in the Y direction. The thickness (height in the Z direction) of the pair of extension portions 12C decreases with increasing distance from the third portion 13 in the Y direction, and has a constant thickness in the regions sandwiching the first recess 18 in the X direction.

[0052] Even when such a structure is adopted, as in the first embodiment, the second portion 12, which has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11, prevents the second portion 12 from being held by the turret 140, which is a holding mechanism of the machine tool, and the area of ​​the body 10 on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 is not restrained by the turret 140. As a result, the value of the strain measured by the strain sensor 41 becomes stable. In this way, the turning tool 1 of this embodiment is a turning tool that can stabilize the value of the strain to be measured.

[0053] (Embodiment 7) Next, a seventh embodiment, which is yet another embodiment, will be described. FIG. 15 is a schematic perspective view showing the structure of a turning tool in the seventh embodiment. FIG. 16 and FIG. 17 are schematic cross-sectional views showing the structure of a turning tool in the seventh embodiment. FIG. 16 shows a cross section along the line segment XVI-XVI in FIG. 15 (a cross section in the YZ plane that is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10). FIG. 17 shows a cross section along the line segment XVII-XVII in FIG. 15 (a cross section in the YZ plane that is a cross section perpendicular to the X direction that is the width direction of the main body 10). The turning tool 1 in the seventh embodiment basically has a similar structure to the turning tool 1 in the first embodiment and has the same effect. However, the turning tool 1 in the seventh embodiment is different from the turning tool 1 in the first embodiment in the structure of the second portion 12 and the installation mode of the strain sensor 41.

[0054] Specifically, the second portion 12 of the turning tool 1 of the seventh embodiment is connected to the third portion 13. The second portion 12 has a larger thickness in the Z direction than the first portion 11, and therefore has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11. The second portion 12 is formed with a first recess 18 extending in the Y direction. Furthermore, in this embodiment, the second portion 12 is formed with a groove 17 as a second recess extending in the X direction. The groove 17 intersects with the first recess 18 and penetrates the second portion 12 of the main body 10 in the X direction. The groove 17 as the second recess is deeper than the first recess 18. The sensor module 40 is accommodated in the first recess 18. At this time, the strain sensor 41 is arranged to straddle the groove 17. The first recess 18 and the groove 17 are filled with the filler 15.

[0055] Even when such a structure is adopted, as in the first embodiment, the second portion 12, which has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11, prevents the second portion 12 from being held by the turret 140, which is a holding mechanism of the machine tool, and the area of ​​the body 10 on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 is not restrained by the turret 140. As a result, the value of the strain measured by the strain sensor 41 becomes stable. In this way, the turning tool 1 of this embodiment is a turning tool that can stabilize the value of the strain to be measured.

[0056] In this embodiment, the sensor 41 is disposed so as to straddle the groove 17. As a result, the rigidity of the main body 10 is increased by the presence of the second portion 12 having a large cross-sectional area as in this embodiment, and even if the strain is reduced, the strain around the groove 17 is amplified by the formation of the groove 17, making it easier for the sensor 41 to detect the strain.

[0057] (Embodiment 8) Next, a further embodiment, the eighth embodiment, will be described. FIG. 18 is a schematic perspective view showing the structure of the turning tool in the eighth embodiment. FIG. 19 is a schematic cross-sectional view showing the structure of the turning tool in the eighth embodiment. FIG. 19 shows a cross section along the line segment XIX-XIX in FIG. 18 (a cross section in the YZ plane, which is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10). The turning tool 1 in the eighth embodiment basically has the same structure as the turning tool 1 in the seventh embodiment, and exerts the same effect. However, the turning tool 1 in the eighth embodiment is different from the turning tool 1 in the seventh embodiment in the structure of the second portion 12 and the installation mode of the sensor 41.

[0058] Specifically, in the eighth embodiment, the groove 17 of the seventh embodiment is omitted, while a pair of third recesses 16 are formed in the first surface 10C which is the outer circumferential surface of the main body 10. The pair of third recesses 16 are arranged side by side along a second annular line δ formed by the intersection of a plane (XZ plane) perpendicular to the Y direction which is the longitudinal direction of the main body 10 and the surface of the main body 10. The strain sensor 41 is arranged on the second annular line δ between the pair of third recesses 16.

[0059] Even when such a structure is adopted, as in the first embodiment, the second portion 12, which has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11, prevents the second portion 12 from being held by the turret 140, which is a holding mechanism of the machine tool, and the area of ​​the body 10 on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 is not restrained by the turret 140. As a result, the value of the strain measured by the strain sensor 41 becomes stable. In this way, the turning tool 1 of this embodiment is a turning tool that can stabilize the value of the strain to be measured.

[0060] Moreover, in this embodiment, the sensor 41 is disposed between the third recesses 16. As a result, the rigidity of the main body 10 is increased by the presence of the second portion 12 having a large cross-sectional area as in this embodiment, and even if the strain is reduced, the strain around the third recess 16 is amplified by the formation of the third recess 16, making it easy for the sensor 41 to detect the strain.

[0061] (Embodiment 9) Next, a ninth embodiment, which is yet another embodiment, will be described. FIG. 20 is a schematic perspective view showing the structure of a turning tool in the ninth embodiment. FIG. 21 is a schematic cross-sectional view showing the structure of a turning tool in the ninth embodiment. FIG. 21 shows a cross section along line segment XXI-XXI in FIG. 20 (a cross section in the YZ plane, which is a cross section perpendicular to the Y direction corresponding to the longitudinal direction of the main body 10). The turning tool 1 in the ninth embodiment basically has the same structure as the turning tool 1 in the eighth embodiment, and exerts the same effect. However, the turning tool 1 in the ninth embodiment differs from the eighth embodiment in the formation mode of the third recess 16.

[0062] Specifically, in the ninth embodiment, two pairs of third recesses 16 are formed on the first surface 10C which is the outer circumferential surface of the main body 10. The strain sensor 41 is disposed between the third recesses 16.

[0063] Even when such a structure is adopted, as in the first embodiment, the second portion 12, which has a larger cross-sectional area perpendicular to the longitudinal direction than the first portion 11, prevents the second portion 12 from being held by the turret 140, which is a holding mechanism of the machine tool, and the area of ​​the body 10 on the tip portion 10A side of the boundary γ between the first portion 11 and the second portion 12 is not restrained by the turret 140. As a result, the value of the strain measured by the strain sensor 41 becomes stable. In this way, the turning tool 1 of this embodiment is a turning tool that can stabilize the value of the strain to be measured.

[0064] Moreover, in this embodiment, the sensor 41 is disposed between the third recesses 16. As a result, as in the case of the eighth embodiment, the formation of the third recesses 16 amplifies the strain around the third recesses 16, making it easier for the sensor 41 to detect the strain.

[0065] It should be understood that the embodiments disclosed herein are illustrative in all respects and are not limiting in any respect. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0066] 1 turning tool, 10 main body, 10A tip, 10B base end, 10C first surface, 10D second surface, 10E third surface, 10F fourth surface, 10G fifth surface, 11 first portion, 11A outer edge, 12 second portion, 12A protrusion, 12C extension, 12D connection portion, 13 third portion, 15 filling material, 16 third recess, 17 groove, 18 first recess, 40 sensor module, 41 strain sensor, 42 wiring portion, 81 underlay, 82 fixing portion, 90 cutting tip, 140 turret, 141 groove, 142 bottom wall, 143 side wall, 150 first fixing member, 151 upper surface, 152 bottom surface, 153 first side surface, 154 second side surface, 155 end surface, 160 Second fixing member, 161 top surface, 162 bottom surface, 163 first side surface, 164 second side surface, 165 end surface, 165A screw hole, 165B screw hole, 165C screw hole, 169A screw, 169B screw, 169C screw, α surface, β first annular line, γ boundary, δ second annular line.

Claims

1. a rod-shaped main body having a tip end portion for holding a cutting tip and a base end portion that is an end portion opposite to the tip end portion in the longitudinal direction; a strain sensor installed in the main body portion, the main body portion includes a first portion including the base end portion, and a second portion formed continuous with the first portion at a position spaced apart from the base end portion in the longitudinal direction and having a larger cross-sectional area perpendicular to the longitudinal direction than the first portion, The strain sensor is arranged on the tip side of the boundary between the first portion and the second portion in the longitudinal direction of the main body.

2. the main body further includes a third portion formed to include the tip portion and having a cross-sectional area perpendicular to the longitudinal direction larger than that of the first portion; 2. The turning tool according to claim 1, wherein the second portion is a region between the base end portion and the third portion in the longitudinal direction of the main body portion, the region including a protrusion formed on the outer circumferential surface of the main body portion at a distance from the third portion.

3. the main body portion includes a plurality of planar portions; 3. The turning tool according to claim 2, wherein the protrusions are formed on a first annular line formed by an intersection of a plane perpendicular to the longitudinal direction of the main body portion and the surface of the main body portion, and a plurality of the protrusions are formed on the same flat surface portion among the plurality of flat surfaces.

4. The turning tool according to claim 3 , wherein a plurality of the protrusions are formed on each of a plurality of the flat surfaces.

5. the main body further includes a third portion formed to include the tip portion and having a cross-sectional area perpendicular to the longitudinal direction larger than that of the first portion; The turning tool according to claim 1 , wherein the second portion is connected to the third portion in the longitudinal direction of the body.

6. a first recess is formed in the outer circumferential surface of the main body; The turning tool of claim 1 , wherein the strain sensor is housed within the first recess.

7. a second recess is formed on the outer circumferential surface of the main body; The turning tool according to claim 1 , wherein the strain sensor is disposed so as to straddle the second recess.

8. a pair of third recesses are formed on the outer peripheral surface of the main body portion and are arranged side by side along a second annular line formed by an intersection of a plane perpendicular to the longitudinal direction of the main body portion and the surface of the main body portion; The turning tool according to claim 1 , wherein the strain sensor is disposed between the pair of third recesses.

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