Rotary cutting tool and sensor device

Abstract

To provide a rotary cutting tool and a sensor device capable of efficiently installing a component for transmitting a signal including information obtained by a sensor to a receiver installed outside.SOLUTION: A rotary cutting tool is equipped with a shaft portion that extends from a first end to a second end portion along a rotation axis, a sensor portion disposed on the shaft, and a cutting edge disposed around the rotation axis of the shaft portion. The sensor portion includes a sensor module that includes a battery, a first sensor that detects a first physical amount of the shaft portion, and a substrate electrically connected to the first sensor. The substrate has a first part that has a first main surface and a second main surface and in which the first main surface is disposed to face an outer peripheral surface of the shaft portion, and a second part that has a third main surface and a fourth main surface, in which the third main surface is disposed on an outer peripheral side of the first part in a diametrical direction of the shaft portion so as to turn to the shaft portion side, and that is electrically connected to the first part.SELECTED DRAWING: Figure 14

Description

[Technical field]

[0001] The present disclosure relates to a milling tool and a sensor device. [Background technology]

[0002] There is known a technique for grasping the state of a cutting tool by measuring the physical quantity of the cutting tool using a sensor during machining with the cutting tool (see, for example, U.S. Patent Application Publication No. 2015 / 0261207 (Patent Document 1), JP Patent Publication No. 2018-54611 (Patent Document 2), JP Patent Publication No. 2009-285804 (Patent Document 3), WO 2017 / 002762 (Patent Document 4), Japanese Patent No. 5988066 (Patent Document 5), Utility Model Registration No. 3170029 (Patent Document 6), JP Patent Publication No. 2015-77658 (Patent Document 7), WO 2015 / 056495 (Patent Document 8), European Patent Application Publication No. 3292929 (Patent Document 9), and European Patent Application Publication No. 3292930 (Patent Document 10)). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2015 / 0261207 [Patent Document 2] JP 2018-54611 A [Patent Document 3] JP 2009-285804 A [Patent Document 4] International Publication No. 2017 / 002762 [Patent Document 5] JP 2016-221665 A [Patent Document 6] Utility model registration No. 3170029 [Patent Document 7] JP 2015-77658 A [Patent Document 8] International Publication No. 2015 / 056495 [Patent Document 9] European Patent Application Publication No. 3292929 [Patent Document 10] European Patent Application Publication No. 3292930 Summary of the Invention

[0004] A milling tool according to the present disclosure includes a shaft portion extending from a first end to a second end along a rotation axis, a sensor portion disposed on the shaft portion, and a cutting edge disposed around the rotation axis of the shaft portion. The sensor portion includes a sensor module including a battery, a first sensor for detecting a first physical quantity of the shaft portion, and a substrate electrically connected to the first sensor. The substrate includes a first portion having a first main surface and a second main surface and disposed so that the first main surface faces an outer circumferential surface of the shaft portion, and a second portion having a third main surface and a fourth main surface and disposed on the outer circumferential side of the first portion in the radial direction of the shaft portion with the third main surface facing the shaft portion, and electrically connected to the first portion. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is a schematic perspective view showing the structure of a cutting tool. [Diagram 2] FIG. 2 is a schematic perspective view showing the structure of the shaft portion. [Diagram 3] FIG. 3 is a schematic perspective view showing the structure of the shaft portion as viewed from a different viewpoint than that of FIG. [Figure 4] FIG. 4 is a schematic plan view showing the structure of the shaft portion as viewed in the rotation axis direction from the first end side. [Diagram 5] FIG. 5 is a schematic plan view showing the structure of the shaft portion as viewed in the rotation axis direction from the second end side. [Figure 6] FIG. 6 is a schematic plan view showing the structure of the shaft portion as viewed in a direction perpendicular to the axial direction. [Figure 7] FIG. 7 is a schematic cross-sectional view showing a cross section taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a schematic cross-sectional view showing the structure in the vicinity of the sensor unit. [Figure 9] FIG. 9 is a schematic perspective view showing the structure of the strain sensor component. [Figure 10] FIG. 10 is a schematic plan view showing the structure of the substrate module. [Figure 11] FIG. 11 is a schematic cross-sectional view showing a cross section taken along line XI-XI in FIG. [Figure 12] FIG. 12 is a schematic cross-sectional view showing a cross section taken along line XII-XII in FIG. [Figure 13] FIG. 13 is a schematic plan view showing a state in which the board module is attached. [Figure 14] FIG. 14 is a schematic cross-sectional view showing a cross section taken along line XIV-XIV in FIG. [Figure 15] FIG. 15 is a schematic cross-sectional view showing a cross section taken along line XV-XV in FIG. [Figure 16] FIG. 16 is a schematic perspective view showing the structure of the case main body. [Figure 17] FIG. 17 is a schematic perspective view showing the structure of the first fixing member. [Figure 18] FIG. 18 is a schematic perspective view showing the structure of the second fixing member. [Figure 19] FIG. 19 is a schematic perspective view showing the structure of the lid (bottom wall portion). [Figure 20] FIG. 20 is a schematic perspective view showing the structure of a cutting tool in the second embodiment. [Figure 21] FIG. 21 is a schematic perspective view showing the structure of a cutting tool in the third embodiment. [Figure 22] FIG. 22 is a schematic perspective view showing the structure of a cutting tool in the fourth embodiment. [Figure 23] FIG. 23 is a schematic perspective view showing a state in which the cutting tool according to the fourth embodiment is disassembled. [Figure 24] FIG. 24 is a schematic diagram showing the configuration of a cutting tool system according to the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] [Problem that this disclosure aims to solve] In order to transmit a signal including information obtained by the sensor to an externally installed receiver, a large number of parts need to be installed on a substrate included in the sensor module. One of the objects of the present disclosure is to provide a milling tool and a sensor device that can efficiently install parts for transmitting a signal including information obtained by the sensor to an externally installed receiver.

[0007] [Effects of this disclosure] According to the cutting tool and sensor device disclosed herein, it is possible to provide a cutting tool and sensor device that allows for efficient installation of components for transmitting a signal including information obtained by the sensor to an externally installed receiver.

[0008] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described. The milling tool of the present disclosure is a milling tool including a shaft portion extending from a first end to a second end along a rotation axis, a sensor portion disposed on the shaft portion, and a cutting edge disposed around the rotation axis of the shaft portion. The sensor portion includes a sensor module including a battery, a first sensor for detecting a first physical quantity of the shaft portion, and a substrate electrically connected to the first sensor. The substrate includes a first portion having a first main surface and a second main surface and disposed so that the first main surface faces the outer circumferential surface of the shaft portion, and a second portion having a third main surface and a fourth main surface and disposed on the outer circumferential side of the first portion in the radial direction of the shaft portion so that the third main surface faces the shaft portion side and electrically connected to the first portion.

[0009] In order to transmit a signal including information obtained by the sensor to an externally installed receiver, a large number of components must be installed on a substrate included in the sensor module. In the cutting tool of the present disclosure, the substrate included in the sensor module includes a first portion and a second portion disposed on the outer periphery side of the first portion. This ensures a sufficient area of ​​the substrate for installing a large number of components for transmitting a signal including information obtained by the sensor to the outside. As a result, according to the cutting tool of the present disclosure, the components for transmitting a signal including information obtained by the sensor to the externally installed receiver can be efficiently installed.

[0010] In the above cutting tool, the sensor module may further include a battery socket electrically connected to the battery and disposed on the third main surface. The battery socket is an important component for supplying power from the battery to the first sensor and components disposed on the board. By disposing this battery socket on the third main surface of the second part facing the shaft part, when the milling tool rotates around the rotation axis, a centrifugal force acts on the battery socket in a direction pressing the battery socket against the third main surface of the second part. As a result, the battery socket is prevented from falling off the second part (board) due to the centrifugal force. By preventing the battery socket from falling off the board, a signal including information obtained by the sensor can be stably transmitted to a receiver disposed outside.

[0011] In the cutting tool, the connection direction of the battery socket may be along the rotation axis. With this configuration, it is possible to prevent the connector connected to the battery socket from coming off the battery socket due to centrifugal force caused by the rotation of the cutting tool.

[0012] In the cutting tool, the battery may be disposed between the first and second portions in a radial direction of the shaft portion. With this configuration, the battery having a large volume can be efficiently accommodated between the first and second portions of the substrate.

[0013] In the cutting tool, the first and second parts may be electrically connected by a first connection part. The first connection part may be a flexible substrate. This configuration makes it easy to install the substrate including the first and second parts.

[0014] In the cutting tool, the first portion, the second portion, and the first connection portion may include an integrated flexible substrate. This configuration facilitates deformation of the substrate. As a result, it becomes easier to install the substrate including the first portion and the second portion.

[0015] In the above cutting tool, the sensor section may further include a case that houses the sensor module. The case may include a cylindrical sidewall section that surrounds the shaft section and extends in a direction along the rotation axis. The first section may be disposed so as to extend in the circumferential direction of the shaft section along an outer circumferential surface of the shaft section. The second section may be disposed so as to extend in the circumferential direction of the sidewall section along an inner circumferential surface of the sidewall section. By disposing the first section and the second section in this manner, it becomes easy to stably house the substrate in the case.

[0016] In the above cutting tool, the sensor module may further include an antenna for transmitting a signal including information on the first physical quantity detected by the first sensor to the outside. The substrate may further include a third portion electrically connected to the first portion by the second connection portion. The antenna may be disposed on the third portion. This configuration allows the antenna to be easily disposed.

[0017] In the cutting tool, the third portion may be disposed between the first portion and the second portion in a radial direction of the shaft portion. By disposing the third portion, in which the antenna is disposed, between the first portion and the second portion, the antenna can be efficiently accommodated between the first portion and the second portion.

[0018] In the above cutting tool, the sensor module may further include a power switch for switching a state of power supply from the battery. The substrate may further include a fourth portion electrically connected to the second portion by a third connection portion. The power switch may be disposed on the fourth portion. This configuration allows the power switch to be easily disposed.

[0019] In the above cutting tool, the fourth portion may be disposed between the first portion and the second portion in a radial direction of the shaft portion. By disposing the fourth portion, in which the power switch is disposed, between the first portion and the second portion, the power switch can be efficiently accommodated between the first portion and the second portion.

[0020] In the cutting tool, the sensor module may include a plurality of batteries. The plurality of batteries may be arranged at equal intervals in the circumferential direction of the shaft portion. By arranging the batteries having a large mass in this manner, it is possible to suppress the influence of the batteries on the rotation balance of the cutting tool.

[0021] In the cutting tool, the sensor module may include a plurality of batteries. The plurality of batteries may be arranged symmetrically with respect to the rotation axis when viewed in the direction of the rotation axis. By arranging the batteries having a large mass in this manner, it is possible to suppress the influence of the batteries on the rotation balance of the cutting tool.

[0022] In the cutting tool, the sensor module may further include an AD converter that converts an analog signal including the first physical quantity detected by the first sensor into a digital signal. The AD converter may be disposed on the second main surface. By disposing the AD converter, which has a relatively large mass, on the second main surface close to the rotation axis, it is possible to prevent the AD converter from falling off due to centrifugal force.

[0023] A sensor device according to a first aspect of the present disclosure includes a shaft portion extending from a first end to a second end along a rotation axis and a sensor portion disposed on the shaft portion, and is capable of forming a sensor portion of a milling tool that cuts a workpiece by rotating around the rotation axis of the shaft portion. The sensor device includes a sensor module including a battery, a first sensor that detects a first physical quantity of the shaft portion, and a substrate electrically connected to the first sensor. The substrate includes a first portion having a first main surface and a second main surface and disposed so that the first main surface faces an outer circumferential surface of the shaft portion, and a second portion having a third main surface and a fourth main surface and disposed on the outer circumferential side of the first portion in the radial direction of the shaft portion so that the third main surface faces the shaft portion, and electrically connected to the first portion.

[0024] A sensor device according to a second aspect of the present disclosure includes a shaft region extending along a rotation axis, a sensor unit disposed in the shaft region, and a connection unit formed at an end of the shaft region in a direction along the rotation axis and connectable to a machining unit having a cutting edge. The sensor unit includes a sensor module including a battery, a first sensor that detects a first physical quantity of the shaft region, and a substrate electrically connected to the first sensor. The substrate includes a first portion having a first main surface and a second main surface and disposed so that the first main surface faces an outer circumferential surface of the shaft region, and a second portion having a third main surface and a fourth main surface and disposed on the outer circumferential side of the first portion in the radial direction of the shaft region so that the third main surface faces the shaft region and electrically connected to the first portion.

[0025] In the sensor device of the present disclosure, the substrate included in the sensor module includes a first portion and a second portion disposed on the outer periphery of the first portion. This ensures a sufficient area on the substrate for mounting a large number of components for transmitting a signal including information obtained by the sensor to the outside. As a result, the sensor device of the present disclosure allows efficient mounting of components for transmitting a signal including information obtained by the sensor to a receiver installed outside.

[0026] [Details of the embodiment of the present invention] Next, an embodiment of a cutting 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.

[0027] (Embodiment 1) (Outline of the structure of cutting tools) FIG. 1 is a schematic perspective view showing the structure of a milling tool. First, the structure of the milling tool will be outlined with reference to FIG. 1. The milling tool 1 in this embodiment includes a shaft portion 10 and a sensor portion 20. The shaft portion 10 extends from a first end portion 10A to a second end portion 10B along a rotation axis A. The sensor portion 20 is arranged so as to surround a part of the longitudinal direction of the shaft portion 10. The shaft portion 10 has a plurality of (four in this example) recesses 13 formed at equal intervals in the circumferential direction and opening at the first end portion 10A and the outer circumferential surface. A cutting tip 91 as a cutting edge is attached to a wall surface defining the recess 13. The cutting tip 91 is arranged around the rotation axis A of the shaft portion 10. The milling tool 1 is rotated around the rotation axis A, and the cutting tip 91 is brought into contact with a workpiece (not shown) to machine the workpiece. That is, the cutting tool 1 is a cutting tool that cuts a workpiece by rotating around a rotation axis A of the shaft portion 10.

[0028] (Shaft structure) Next, each part of the milling tool will be described in detail. FIG. 2 is a schematic perspective view showing the structure of the shaft portion as viewed from the second end portion 10B side. FIG. 3 is a schematic perspective view showing the structure of the shaft portion as viewed from the first end portion 10A side. FIG. 4 is a schematic plan view showing the structure of the shaft portion as viewed in the rotation axis direction from the first end portion. FIG. 5 is a schematic plan view showing the structure of the shaft portion as viewed in the rotation axis direction from the second end portion. FIG. 6 is a schematic plan view showing the structure of the shaft portion as viewed in a direction perpendicular to the axial direction. FIG. 7 is a schematic cross-sectional view showing a cross section along line segment VII-VII in FIG. 5. The structure of the shaft portion 10 will be described with reference to FIGS. 2 to 7.

[0029] 2 and 3, the shaft portion 10 includes a main body portion 11 and an expanded diameter portion 12 as a first region. The main body portion 11 has a cylindrical shape. The rotation axis A coincides with the central axis of the main body portion 11. The expanded diameter portion 12 is a portion having a larger diameter than the main body portion 11. The position of the expanded diameter portion 12 in the longitudinal direction of the main body portion 11 is not particularly limited, but in this embodiment, it is disposed in the central portion in the longitudinal direction of the main body portion 11. The expanded diameter portion 12 is disposed in a region of the shaft portion 10 surrounded by the sensor portion 20.

[0030] 2 to 4, as described above, the cutting tip 91 is attached to the wall surface that defines the recess 13 of the shaft portion 10. The cutting tip 91 is fixed to the shaft portion 10 by inserting a screw 92 into a threaded hole formed in the cutting tip 91 and tightening the screw 92.

[0031] 2 to 6, the enlarged diameter portion 12 has an octagonal prism shape. With reference to FIGS. 4 and 5, the enlarged diameter portion 12 has an octagonal shape when viewed in the direction along the rotation axis A. More specifically, the enlarged diameter portion 12 has an octagonal shape in a cross section perpendicular to the rotation axis A, in which four isosceles right triangles of the same shape are removed from each of the four corners of a square. The rotation axis A passes through the center of gravity of this octagon. The shape of this octagon is the same in the direction along the rotation axis A. The central axis of the main body 11 and the central axis of the enlarged diameter portion 12 coincide with each other. Here, the central axis of the enlarged diameter portion 12 means a straight line passing through the center of gravity of the octagon.

[0032] 4 and 5, when viewed in the direction along the rotation axis A, the octagon is constituted by outer peripheral surfaces 12A corresponding to the alternately arranged long sides and outer peripheral surfaces 12B corresponding to the short sides shorter than the long sides. A ,L BThe angles θ between the two are equal to each other. Specifically, the angle θ is 45°. Note that the shape of the octagon is not limited to the above-mentioned shape, and the lengths of the outer peripheral surface 12A and the outer peripheral surface 12B when viewed in the direction along the rotation axis A may be the same.

[0033] 2 to 6, a first recess 16 is formed in each outer peripheral surface 12B, extending in a direction along the rotation axis A. A bottom surface 16A defining the first recess 16 is a flat surface. B The first recess 16 penetrates the outer peripheral surface 12B in a direction along the rotation axis A. A second recess 15 extending in the circumferential direction of the enlarged diameter portion 12 is formed in the outer peripheral surfaces 12A, 12B of the enlarged diameter portion 12. The second recess 15 is formed so as to overlap with the first recess 16. The second recess 15 intersects (is perpendicular to) the first recess 16. The second recess 15 is formed around the entire circumference of the outer peripheral surfaces 12A, 12B of the enlarged diameter portion 12. That is, the second recess 15 is formed in an annular shape.

[0034] 6 and 7, the depth d2 of the second recess 15 is greater than the depth d1 of the first recess 16. A first small diameter portion 11A having a smaller diameter than the other portions is formed at the boundary between the first end 10A side of the main body portion 11 and the expanded diameter portion 12. A second small diameter portion 11B having a smaller diameter than the other portions is formed at the boundary between the second end 10B side of the main body portion 11 and the expanded diameter portion 12. A through hole 10C is formed in the shaft portion 10, penetrating the shaft portion 10 in a direction along the rotation axis A. The through hole 10C extends to include the rotation axis A.

[0035] (Sensor structure) Next, the structure of the sensor unit 20 will be described with reference to Figs. 8 to 19. This sensor unit 20 corresponds to one embodiment of the sensor device of the present disclosure. With reference to Figs. 8 and 10, the sensor unit 20 includes a sensor module 80 and a case 21 that houses the sensor module 80. The sensor module 80 includes a plurality of strain sensors 31 as a plurality of first sensors, a substrate 49 electrically connected to the strain sensors 31, and a wireless communication unit 51 (see Fig. 10) electrically connected to the substrate 49. The strain sensor 31 detects strain as a first physical quantity of the shaft unit 10. The wireless communication unit 51 includes an antenna 51A. The antenna 51A of the wireless communication unit 51 transmits a signal including information on the strain detected by the strain sensor 31 to the outside.

[0036] 9, the strain sensor 31 constitutes a strain sensor component 30. The strain sensor component 30 includes the strain sensor 31 and a wire 32 that is connected to the strain sensor 31 and has a connector 33 at its tip. The wire 32 has a strip-like shape. The strain sensor 31 is disposed near one end of the wire 32. The connector 33 is disposed at the other end of the wire 32.

[0037] 10 to 12, substrate 49 constitutes substrate module 40. Substrate 49 includes a substrate body made of an insulator such as resin, and a circuit pattern (not shown) made of a conductor such as copper and formed on the surface of the substrate body.

[0038] 10, the board module 40 includes a board 49, a wireless communication unit 51, an acceleration sensor 52 as a second sensor, a socket 53, an AD converter 54, a power supply circuit 55, a battery socket 56, a charging connector 57, and a power switch 58. The wireless communication unit 51, the acceleration sensor 52, the socket 53, the AD converter 54, the power supply circuit 55, the battery socket 56, the charging connector 57, and the power switch 58 are disposed on the board 49 and are electrically connected to the board 49 (the circuit pattern of the board 49). The acceleration sensor 52 detects the acceleration of the shaft portion 10 as a second physical quantity. A plurality of acceleration sensors 52 are disposed on the board 49. The wireless communication unit 51 is electrically connected to the acceleration sensor 52 via the board 49. The antenna 51A of the wireless communication unit 51 transmits a signal including information on the acceleration of the shaft portion 10 detected by the acceleration sensor 52 to the outside.

[0039] The substrate 49 includes a first portion 410, a second portion 420, a first connecting portion 430, a third portion 440, a second connecting portion 450, a fourth portion 460, and a third connecting portion 470. The first portion 410 and the second portion 420 each have a strip-like shape. With reference to FIG. 10 and FIG. 11, the first portion 410 includes a first portion first region 411, a first portion second region 412, a first portion third region 413, a first portion fourth region 414, a first portion fifth region 415, a first portion sixth region 416, a first portion seventh region 417, a first portion eighth region 418, and a first portion ninth region 419, which are arranged in this order. A bendable portion 410A is disposed between each of these adjacent regions.

[0040] 11, the first portion 410 includes a main body 49B, which is a flexible substrate, and a reinforcing plate 72 that is disposed on one main surface (the main surface opposite to the side on which the circuit pattern is formed) of the main body 49B and has a larger Young's modulus than the main body 49B. The reinforcing plate 72 is disposed in each of the areas corresponding to the first portion first region 411, the first portion second region 412, the first portion third region 413, the first portion fourth region 414, the first portion fifth region 415, the first portion sixth region 416, the first portion seventh region 417, the first portion eighth region 418, and the first portion ninth region 419. The reinforcing plate 72 is not disposed in the area corresponding to the bendable portion 410A. As a result, the bendable portion 410A is bendable.

[0041] 10 and 11, one or more (here, a plurality, specifically, two) through holes 59 are formed in each of the first portion first section 411 and the first portion ninth section 419, penetrating the first portion 410 in the thickness direction. The two through holes 59 are arranged side by side in a direction intersecting (perpendicular to) the longitudinal direction of the first portion 410, that is, in the width direction of the first portion 410. Sockets 53 are arranged on each of the first portion first section 411, the first portion third section 413, the first portion fifth section 415, and the first portion seventh section 417. The sockets 53 are arranged at the ends of the first portion 410 in the width direction. Acceleration sensors 52 are arranged on each of the first portion second section 412, the first portion fourth section 414, and the first portion sixth section 416. An AD converter 54 is arranged on the first portion fourth section 414. On the first portion fourth section 414 , the acceleration sensor 52 and the AD converter 54 are arranged side by side in the width direction of the first portion 410 .

[0042] 10 and 12, the second portion 420 includes a second portion first region 421, a second portion second region 422, a second portion third region 423, a second portion fourth region 424, a second portion fifth region 425, and a second portion sixth region 426, which are arranged in this order. A bendable portion 420A is disposed between each of these adjacent regions.

[0043] 12, second portion 420 includes main body 49B, which is a flexible substrate, and reinforcing plate 72, which is disposed on one main surface (the main surface opposite to the side on which the circuit pattern is formed) of main body 49B and has a larger Young's modulus than main body 49B. Reinforcing plate 72 is disposed in each of areas corresponding to second portion first region 421, second portion second region 422, second portion third region 423, second portion fourth region 424, second portion fifth region 425, and second portion sixth region 426. Reinforcing plate 72 is not disposed in an area corresponding to bendable portion 420A. As a result, bendable portion 420A is bendable.

[0044] 10 and 12, a through hole 59 is formed in each of the second portion first section 421 and the second portion sixth section 426, penetrating the second portion 420 in the thickness direction. A battery socket 56 is disposed on each of the second portion first section 421 and the second portion sixth section 426. The battery socket 56 is disposed in the center of the second portion 420 in the width direction. The connection direction of the battery socket 56 (connection direction γ of the connector connected to the battery socket 56) is along the width direction of the second portion 420. As described later, when the board module 40 is accommodated in the case 21, the connection direction γ of the battery socket 56 is along the rotation axis A. A power supply circuit 55 is disposed on each of the second portion second section 422 and the second portion fifth section 425. A charging connector 57 is disposed on the second portion third section 423.

[0045] The first portion sixth section 416 and the second portion fourth section 424 are physically and electrically connected by a first connection section 430 having a strip-like shape. The first connection section 430, the main body section 49B of the first portion 410, and the main body section 49B of the second portion 420 are configured from an integrated flexible substrate. That is, the first portion 410, the second portion 420, and the first connection section 430 include an integrated flexible substrate that extends over the entire first portion 410, the second portion 420, and the first connection section 430. The first portion eighth section 418 and the third portion 440 are physically and electrically connected by a second connection section 450. A wireless communication section 51 including an antenna 51A is disposed on the third portion 440. The second portion third section 423 and the fourth portion 460 are physically and electrically connected by a third connection section 470. A power switch 58 is disposed on the fourth portion 460. Substrate 49 is an integrated flexible substrate, with reinforcing plates provided in areas where rigidity is required, and portions where no reinforcing plates are provided are bendable.

[0046] 10 and 5, the lengths of the first portion first section 411, the first portion third section 413, the first portion fifth section 415, the first portion seventh section 417, and the first portion ninth section 419 in the longitudinal direction of the first portion 410 correspond to the outer peripheral surface 12B, which is the short side of the octagon when the expanded diameter section 12 is viewed in the direction along the rotation axis A. The lengths of the first portion second section 412, the first portion fourth section 414, the first portion sixth section 416, and the first portion eighth section 418 in the longitudinal direction of the first portion 410 correspond to the outer peripheral surface 12A, which is the long side of the octagon when the expanded diameter section 12 is viewed in the direction along the rotation axis A.

[0047] Next, the installation of the strain sensor component 30 and the board module 40 on the shaft portion 10 will be described. The strain sensor component 30 is arranged so that the strain sensor 31 straddles the second recess 15 and is housed in the first recess 16 (see Figures 2, 4, 8, etc.). In other words, the strain sensor 31 is arranged so as to detect strain in the direction along the rotation axis A. The strain sensor component 30 is installed on each of the four outer peripheral surfaces 12B. As a result, when viewed in the direction along the rotation axis A, the strain sensor 31 is located on the outer peripheral surfaces of the expanded diameter portion 12 corresponding to each side of the octagon, and is aligned with the perpendicular line L passing through the rotation axis A. B are disposed on the entire outer circumferential surface 12B (the outer circumferential surface corresponding to the short side) of the enlarged diameter portion 12 which are at 90° to each other.

[0048] 13 to 15, the first portion 410 of the substrate 49 includes a first main surface 410B and a second main surface 410C located on the opposite side of the first main surface 410B in the thickness direction. The first portion 410 is disposed so that the first main surface 410B faces the outer circumferential surface of the shaft portion 10. The wireless communication unit 51, the acceleration sensor 52, the socket 53, the AD converter 54, and the like are mounted on the second main surface 410C. The first portion 410 is wound around the enlarged diameter portion 12 so that the first main surface 410B contacts the outer circumferential surfaces 12A and 12B of the enlarged diameter portion 12. At this time, the first portion first region 411, the first portion third region 413, the first portion fifth region 415, the first portion seventh region 417, and the first portion ninth region 419 are arranged on the outer peripheral surface 12B, and the first portion second region 412, the first portion fourth region 414, the first portion sixth region 416, and the first portion eighth region 418 are arranged on the outer peripheral surface 12A. The first portion 410 is bent at the bendable portion 410A. The first portion first region 411 and the first portion ninth region 419 overlap each other so that the through holes 59 formed therein coincide with each other. A fixing member (not shown) is installed to pass through the through holes 59, and the first portion 410 is fixed to the shaft portion 10.

[0049] As a result, the first portion 410 is disposed along the outer circumferential surfaces 12A, 12B of the enlarged diameter portion 12 when viewed in the direction along the rotation axis A. The socket 53 is disposed on the first portion 410 located on the outer circumferential surface 12B. Then, the connector 33 located at the end of the wiring 32 connected to the strain sensor 31 is connected to the socket 53. This electrically connects the first portion 410 and the strain sensor 31. As shown in FIG. 8, the wiring 32 straddles the first portion 410 in the width direction (direction along the rotation axis A). The wiring 32 is warped in an arch shape. That is, the wiring 32 connects the strain sensor 31 and the socket 53 with slack. When viewed in the direction along the rotation axis A, the acceleration sensor 52 is disposed on the outer circumferential surfaces of the enlarged diameter portion 12 corresponding to each side of the octagon, and is disposed on the perpendicular line L passing through the rotation axis A. A are disposed on outer peripheral surface 12A (outer peripheral surface corresponding to the long side) of enlarged diameter portion 12, which form an angle of 90° with each other. Strain sensor 31 and acceleration sensor 52 are disposed on outer peripheral surfaces 12A and 12B of enlarged diameter portion 12, which correspond to different sides of the octagon.

[0050] 14 and 15, the second portion 420 of the substrate 49 includes a third main surface 420B and a fourth main surface 420C located on the opposite side to the third main surface 420B in the thickness direction. The second portion 420 is disposed on the outer circumferential side of the first portion 410 in the radial direction of the shaft portion 10 such that the third main surface 420B faces the shaft portion 10. The first connection portion 430 electrically connecting the first portion 410 and the second portion 420 is disposed between the first portion 410 and the second portion 420 in the radial direction of the shaft portion 10.

[0051] The case 21 includes a cylindrical side wall portion 23 surrounding the shaft portion 10 and extending in a direction along the rotation axis A, a bottom wall portion 22 closing a first opening of the side wall portion 23 in the direction along the rotation axis A, and an upper wall portion 24 closing a second opening of the side wall portion located on the opposite side to the first opening in the direction along the rotation axis A. The bottom wall portion 22 is made of resin. The first portion 410 is disposed so as to extend in the circumferential direction of the shaft portion 10 along the outer circumferential surface of the shaft portion 10. The second portion 420 is disposed so as to extend in the circumferential direction of the side wall portion 23 along the inner circumferential surface of the side wall portion 23. The second portion 420 is bent at the bendable portion 420A. A power supply circuit 55, a battery socket 56, a charging connector 57, and the like are disposed on a third main surface 420B of the second portion 420. At this time, the connection direction γ of the battery socket 56 is a direction along the rotation axis A.

[0052] 13 and 15, the sensor module 80 includes a battery 99. In this embodiment, the sensor module 80 includes a plurality of batteries 99 (specifically, two batteries). The battery 99 is disposed between the first portion 410 and the second portion 420 in the radial direction of the shaft portion 10. The plurality of batteries 99 are disposed at equal intervals in the circumferential direction of the shaft portion 10. The plurality of batteries 99 are disposed symmetrically with respect to the rotation axis A when viewed in the direction along the rotation axis A. The battery 99 is a rechargeable battery, that is, a secondary battery. The battery 99 supplies power to the wireless communication unit 51, the acceleration sensor 52, the socket 53, the AD converter 54, and the like on the first portion 410 connected to the second portion 420 by the first connection portion 430, via the battery socket 56 and the power supply circuit 55 disposed on the second portion 420. The battery 99 is charged via the charging connector 57 disposed on the second portion 420. The battery 99 may be a primary battery.

[0053] The third portion 440 as a base member on which the wireless communication unit 51 including the antenna 51A is mounted is disposed between the first portion 410 and the second portion 420 in the radial direction of the shaft portion 10. Here, the installation state of the wireless communication unit 51 including the antenna 51A is adjusted by bending the second connection portion 450. Specifically, referring to FIG. 14, the wireless communication unit 51 including the antenna 51A is mounted on a mounting surface 440A as a first surface of the third portion 440. That is, in this embodiment, the base member is a substrate. The base member of the present disclosure is not limited to a substrate, and various shapes of support members having a first surface (mounting surface) on which the antenna 51A (the wireless communication unit 51 including the antenna 51A) is mounted can be adopted as the base member. The antenna 51A is a chip antenna or a pattern antenna. Antenna 51A is a transmitting antenna that transmits to the outside information on strain, which is a first physical quantity detected by strain sensor 31 as a first sensor, and information on acceleration, which is a second physical quantity detected by acceleration sensor 52 as a second sensor. In a cross section including rotation axis A (cross section shown in FIG. 14), a first direction α, which is a direction perpendicular to mounting surface 440A, is inclined with respect to plane β perpendicular to rotation axis A and rotation axis A. The angle between plane β perpendicular to rotation axis A and first direction α is preferably 5° to 85°, 15° to 75°, and further preferably 20° to 70°. The angle between plane β perpendicular to rotation axis A and first direction α can be, for example, 30° to 45°.

[0054] The fourth portion 460 on which the power switch 58 is mounted is disposed between the first portion 410 and the second portion 420 in the radial direction of the shaft portion 10. The third connection portion 470 is bent, thereby making it possible to adjust the installation state of the power switch 58. The power switch 58 can switch the state (on or off) of the power supply from the battery 99.

[0055] Next, the installation of the case 21 on the shaft portion 10 will be described. With reference to FIG. 8 and FIG. 13 to FIG. 19, the case 21 includes a case main body 61, a first fixing member 63, a second fixing member 65, and a lid 22. As shown in FIG. 16, the case main body 61 includes a disk-shaped upper wall portion 24 having a through hole 61A in the center, and a side wall portion 23 rising from the outer circumferential surface of the upper wall portion 24 and having a cylindrical shape. The upper wall portion 24 has a plurality of screw holes 62 (eight in this example) formed at equal intervals in the circumferential direction, penetrating the upper wall portion 24 in the thickness direction. The material constituting the case main body 61 is, for example, a metal. Examples of metals that can be used include aluminum alloys and iron alloys (steels such as stainless steel).

[0056] Referring to FIG. 17, the first fixing member 63 has a shape of a circular ring flat plate divided into two. In the first fixing member 63, a plurality of screw holes 64 (here, a total of eight in the first fixing member 63 divided into two) are formed at equal intervals in the circumferential direction so as to correspond to the screw holes 62 in the upper wall portion 24 of the case main body 61. The inner peripheral surface 63A of the first fixing member 63 has a shape corresponding to the second small diameter portion 11B of the shaft portion 10. In a state in which the two first fixing members 63 are combined to form an annular shape, the diameter of the inner peripheral surface 63A is the same as or slightly larger than the diameter of the first small diameter portion 11A. The material constituting the first fixing member 63 is, for example, a metal. Examples of usable metals include aluminum alloys and iron alloys (steels such as stainless steel).

[0057] 18, the second fixing member 65 is a part having a flat arc shape. In this embodiment, the case 21 includes two second fixing members 65. The inner peripheral surface 65A of each second fixing member 65 has a shape corresponding to a part of the planar shape of the outer peripheral surface of the enlarged diameter portion 12, that is, a shape corresponding to a part of an octagon. The second fixing member 65 has a plurality of screw holes 66 (here, two for each second fixing member 65) formed so as to correspond to the screw holes 62 of the upper wall portion 24 of the case main body 61 and the screw holes 64 of the first fixing member 63. The material constituting the second fixing member 65 is, for example, a resin.

[0058] 19, the lid (bottom wall portion) 22 has a disk-like shape with a through-hole 22A in the center. The material forming the lid 22 is, for example, resin.

[0059] 8, the case body 61 is arranged so that the body portion 11 of the shaft portion 10 passes through the through hole 61A of the upper wall portion 24 of the case body 61. The first fixing member 63 is fitted into the second small diameter portion 11B so that the inner circumferential surface 63A contacts the wall surface of the second small diameter portion 11B of the body portion 11 when the first fixing member 63 is arranged in contact with the upper wall portion 24. The second fixing member 65 is arranged so that the inner circumferential surface 65A contacts the outer circumferential surfaces 12A, 12B of the expanded diameter portion 12 when the second fixing member 65 is arranged in contact with the first fixing member 63.

[0060] Then, the case body 61, the first fixing member 63 and the second fixing member 65 are fixed to each other by a screw that penetrates the screw hole 64 of the second fixing member 65 and the screw hole 64 of the first fixing member 63 and reaches the screw hole 62 of the upper wall portion 24. At this time, since the inner diameter of the first fixing member 63 corresponds to the outer diameter of the second small diameter portion 11B, the central axis of the case body 61 and the rotation axis A coincide with each other. In addition, since the inner peripheral surface 65A of the second fixing member 65 has a shape corresponding to a part of the planar shape of the outer peripheral surface of the enlarged diameter portion 12 (a shape corresponding to a part of an octagon), the case body 61 is prevented from rotating in the circumferential direction relative to the shaft portion 10. The lid (bottom wall portion) 22 is fixed to the enlarged diameter portion 12 by, for example, a screw while contacting the end face of the side wall portion 23 and the end face of the enlarged diameter portion 12. In this way, the case 21 is fixed to the shaft portion 10 with the sensor module 80 accommodated therein.

[0061] (Motion of cutting tool) During operation of the milling tool 1, the milling tool 1 rotates around the rotation axis A. Then, the cutting tip 91 comes into contact with the workpiece, thereby machining the workpiece. At this time, the strain and acceleration of the shaft portion 10 are detected by the strain sensor 31 and the acceleration sensor 52, respectively. The strain and acceleration information, which are analog signals, are converted into digital signals by the AD converter 54, and then transmitted to the outside by the antenna 51A of the wireless communication unit 51. The wireless communication unit 51 and the AD converter 54 are operated by power supplied from the battery 99 via the battery socket 56 and the power supply circuit 55. Since the lid (bottom wall portion) 22 of the case 21 is made of resin, the wireless communication unit 51 can transmit a signal to the outside through the lid (bottom wall portion) 22. This signal is received and analyzed by a receiver installed outside, and the state of the shaft portion 10 is grasped.

[0062] (Effects of this embodiment) In the milling tool 1 of this embodiment, the first direction α, which is a direction perpendicular to the mounting surface 440A of the third portion 440 on which the wireless communication unit 51 including the antenna 51A, which is a transmitting antenna, is mounted, is inclined with respect to both the plane β perpendicular to the rotation axis A and the rotation axis A. This makes it possible to avoid the occurrence of a timing when the electric field strength of the polarized wave in the direction that is easy for the receiving antenna to receive becomes extremely weak. As a result, the milling tool 1 of this embodiment is a milling tool that suppresses the loss of information obtained by the strain sensor 31 and the like, while easily receiving a signal including the information at an externally installed receiver.

[0063] Furthermore, in the cutting tool 1 of this embodiment, a resin bottom wall 22 is used. As a result, it is possible to easily transmit a signal from the antenna to the outside while suppressing a decrease in the rigidity of the case 21. Note that the upper wall 24 may be made of resin, or only a part of the bottom wall 22 and the upper wall 24 may be made of resin.

[0064] In addition, in the milling tool 1 of this embodiment, the battery socket 56, which is a component arranged on the second part 420 arranged on the outer periphery side of the first part 410, is arranged on the third main surface 420B, which is the main surface facing the shaft part 10. As a result, the battery socket 56 is prevented from falling off due to centrifugal force. Furthermore, the power supply circuit and the charging connector 57, which are components arranged on the second part 420, are also arranged on the third main surface 420B, thereby preventing them from falling off due to centrifugal force.

[0065] In the cutting tool 1 of the present embodiment, the battery 99 is disposed between the first portion 410 and the second portion 420 in the radial direction of the shaft portion 10. In this manner, by locating the battery, which has a large mass, as close as possible to the rotation axis A, the centrifugal force that the battery 99 receives is suppressed.

[0066] In the milling tool 1 of the present embodiment, the first connection portion 430 is a flexible substrate. In this manner, by connecting the first portion 410 and the second portion 420 with a flexible substrate having flexibility, it becomes easy to appropriately install the first portion 410 and the second portion 420.

[0067] In the milling tool 1 of this embodiment, the first part 410, the second part 420 and the first connection part 430 include an integrated flexible substrate. More specifically, the first connection part 430, the main body part 49B of the first part 410 and the main body part 49B of the second part 420 are configured from an integrated flexible substrate. Then, in the integrated flexible substrate, the reinforcing plate 72 is provided in a portion requiring rigidity, and the portion where the reinforcing plate 72 is not provided is bendable. As a result, a high degree of freedom in designing the substrate module 40 is ensured.

[0068] In addition, in the milling tool 1 of this embodiment, the connection direction γ of the battery socket 56 is along the rotation axis A. This prevents the connector from falling off the battery socket 56 due to the centrifugal force caused by the rotation of the milling tool 1.

[0069] Moreover, in the milling tool 1 of this embodiment, the first portion 410 is disposed so as to extend in the circumferential direction of the shaft portion 10 along the outer circumferential surface of the shaft portion 10. The second portion 420 is disposed so as to extend in the circumferential direction of the side wall portion 23 along the inner circumferential surface of the side wall portion 23. This makes it easy to fix the first portion 410 and the second portion 420.

[0070] Moreover, in the cutting tool 1 of the present embodiment, the wireless communication unit 51 including the antenna 51A is disposed in the third portion 440 electrically connected to the first portion 410 by the second connection portion 450. This increases the degree of freedom in installing the wireless communication unit 51 including the antenna 51A.

[0071] In the cutting tool 1 of the present embodiment, the third portion 440 is disposed between the first portion 410 and the second portion 420 in the radial direction of the shaft portion 10. This further increases the degree of freedom in installing the wireless communication unit 51 including the antenna 51A.

[0072] Moreover, in the cutting tool 1 of the present embodiment, the power switch 58 is disposed in the fourth part 460 electrically connected to the second part 420 by the third connection part 470. This increases the degree of freedom in installing the power switch 58.

[0073] In the cutting tool 1 of the present embodiment, the fourth portion 460 is disposed between the first portion 410 and the second portion 420 in the radial direction of the shaft portion 10. This further increases the degree of freedom in installing the power switch 58.

[0074] Furthermore, in the cutting tool 1 of this embodiment, the multiple batteries 99 are arranged at equal intervals in the circumferential direction of the shaft portion 10. By arranging the batteries 99, which have a large mass, in this manner, it is possible to achieve stable rotation of the cutting tool 1.

[0075] Furthermore, in the cutting tool 1 of this embodiment, the multiple batteries 99 are arranged symmetrically with respect to the rotation axis A when viewed in the direction of the rotation axis A. By arranging the batteries 99, which have a large mass, in this manner, it is possible to achieve stable rotation of the cutting tool 1.

[0076] Moreover, in the milling tool 1 of the present embodiment, the AD converter 54 is disposed on the second main surface 410C. In this manner, by disposing the AD converter 54, which has a relatively large mass, on the second main surface 410C close to the rotation axis A, it is possible to prevent the AD converter 54 from falling off due to centrifugal force.

[0077] (Modification) In the above embodiment, a case has been described in which two types of sensors, the strain sensor 31 and the acceleration sensor 52, are employed as the first sensor and the second sensor, respectively. However, for example, the acceleration sensor 52 as the second sensor may be omitted. Also, the strain sensor 31 may be omitted and only the acceleration sensor 52 may be employed. That is, the first sensor may be an acceleration sensor. Furthermore, a sensor (for example, a temperature sensor) that detects a physical quantity other than strain and acceleration may be employed in place of one or both of the strain sensor 31 and the acceleration sensor 52, or may be employed in addition to them.

[0078] In the above embodiment, an end mill has been described as an example of the cutting tool of the present disclosure, but the cutting tool of the present disclosure is not limited thereto. The cutting tool of the present disclosure may be, for example, a drill, a milling cutter, a boring bar, a reamer, a tap, or the like.

[0079] In the above embodiment, the case has been described where the expanded diameter section 12 arranged in the area of ​​the shaft section 10 surrounded by the sensor section 20 is octagonal when viewed in the direction along the rotation axis A. However, the planar shape of the expanded diameter section may be any 4n-sided shape (n is a natural number of 2 or more), and may be, for example, a dodecagon, a hexagon, or an icosagon.

[0080] In the above embodiment, the strain sensor 31 is disposed on all (four faces) of the outer peripheral surface 12B of the enlarged diameter portion 12 corresponding to each side of the octagon, where the perpendicular lines passing through the rotation axis A form 90° with each other, of the outer peripheral surfaces 12A, 12B of the enlarged diameter portion 12, but the strain sensor may be disposed on at least two faces. More generally, the strain sensor is disposed on each of a set of three outer peripheral surfaces, a first outer peripheral surface and a second outer peripheral surface, where the perpendicular lines passing through the rotation axis form 90° with respect to the first outer peripheral surface, of the outer peripheral surfaces of the first region (enlarged diameter portion) corresponding to each side of the 4n-polygon, in total, two outer peripheral surfaces, or a third outer peripheral surface, where the perpendicular line passing through the rotation axis forms 180° with respect to the first outer peripheral surface. By installing strain sensors on the first and second outer peripheral surfaces whose perpendicular lines passing through the rotation axis form an angle of 90° with each other, information on the magnitude and direction of the load acting in a plane perpendicular to the rotation axis can be obtained. Furthermore, by installing a strain sensor on the third outer peripheral surface, the influence of the load parallel to the rotation axis can be eliminated, and information on the magnitude and direction of the load acting in a plane perpendicular to the rotation axis can be obtained more accurately. There may be a plurality of sets of outer peripheral surfaces. For example, when there are two sets of outer peripheral surfaces, a strain sensor is arranged on each set of outer peripheral surfaces including two or three outer peripheral surfaces. That is, a strain sensor is arranged on a maximum of six outer peripheral surfaces. There is no limit on the angle between the two sets of outer peripheral surfaces.

[0081] In the above embodiment, the case where the first fixing member 63 and the second fixing member 65 are separate bodies has been described. However, the first fixing member 63 and the second fixing member 65 may be integrated. In this case, the first fixing member 63 and the second fixing member 65 may be an integrated metal member.

[0082] In the above embodiment, the case where the sensor unit 20 is attached to the shaft unit 10 using the first fixing member 63 and the second fixing member 65 has been described, but the method of attaching the sensor unit 20 is not limited to this. The sensor unit 20 may be attached to the shaft unit 10 by other methods, such as shrink fitting.

[0083] (Embodiment 2) Next, a second embodiment, which is another embodiment of the present disclosure, will be described. Fig. 20 is a schematic perspective view showing the structure of a cutting tool in the second embodiment. Referring to Fig. 20, the cutting tool 1 in this embodiment basically has a similar structure to the cutting tool 1 in the first embodiment described based on Figs. 1 to 19, operates in the same manner, and provides the same effects. However, the cutting tool 1 in the second embodiment differs from the first embodiment mainly in the structure of the shaft portion 10.

[0084] Specifically, referring to FIG. 20, the shaft portion 10 of the present embodiment includes a first protrusion 10D and a second protrusion 10E, which are annular and protrude in the radial direction (perpendicular to the rotation axis A), in a region closer to the second end 10B than the sensor portion 20. The second protrusion 10E is disposed on the second end 10B side as viewed from the first protrusion 10D. In the direction along the rotation axis A, the region between the first protrusion 10D and the second protrusion 10E of the shaft portion 10 is a groove portion 10G. The region on the opposite side of the first protrusion 10D as viewed from the second protrusion 10E is a tapered portion 10F whose diameter becomes smaller as it approaches the second end. That is, the shaft portion 10 of the present embodiment includes a tapered portion 10F having a truncated cone shape.

[0085] In the use state of the cutting tool 1 of this embodiment, the tapered portion 10F is inserted into a recess formed in the spindle of the machine tool, thereby holding the cutting tool 1 in the spindle of the machine tool. The shapes of the tapered portion 10F, the first protruding portion 10D, and the second protruding portion 10E can be appropriately selected according to a tool holding mechanism provided in the spindle of the machine tool.

[0086] (Embodiment 3) Next, a third embodiment, which is yet another embodiment of the present disclosure, will be described. Fig. 21 is a schematic perspective view showing the structure of a cutting tool in the third embodiment. Referring to Fig. 21, the cutting tool 1 in this embodiment basically has a similar structure to the cutting tool 1 in the first embodiment described based on Figs. 1 to 19, operates in the same manner, and provides the same effects. However, the cutting tool 1 in the third embodiment is different from the first embodiment in that a portion including a sensor unit 20 as the sensor device of the present disclosure and a portion including a first end 10A are separable.

[0087] 21, in the shaft portion 10 of the milling tool 1 in the third embodiment, a tip region 10I as a machining unit including a first end portion 10A is separable at a portion closer to the first end portion 10A than the region surrounded by the sensor portion 20. The portion of the shaft portion 10 other than the tip region 10I is a base end region 10H as a shaft region of the sensor device.

[0088] A male threaded portion 19A is formed at the end of the tip region 10I on the second end 10B side. The male threaded portion 19A is a cylindrical protrusion that protrudes along the rotation axis A toward the second end 10B side. A helical thread is formed on the outer circumferential surface of the male threaded portion 19A. A female threaded portion 19B is formed as a connecting portion at the end of the base region 10H on the first end 10A side. The female threaded portion 19B is a cylindrical recess that is recessed along the rotation axis A toward the second end 10B side. The female threaded portion 19B is a recess having a shape corresponding to the shape of the male threaded portion 19A. A helical screw groove corresponding to the screw thread of the male threaded portion 19A is formed on the inner circumferential surface that defines the female threaded portion 19B.

[0089] The tip region 10I and the base region 10H are integrated by screwing the male thread portion 19A into the female thread portion 19B to couple the male thread portion 19A and the female thread portion 19B together. This provides a milling tool 1 similar to that of the first embodiment. The tip region 10I and the base region 10H can be separated by releasing the coupling between the male thread portion 19A and the female thread portion 19B.

[0090] In the above embodiment, a case has been described in which the male thread portion 19A is formed in the tip region 10I and the female thread portion 19B is formed in the base region 10H, but the female thread portion 19B may be formed in the tip region 10I and the male thread portion 19A may be formed in the base region 10H.

[0091] In addition, in the above embodiment, a case has been described in which the boundary between the tip region 10I and the base region 10H is located closer to the first end 10A than the sensor portion 20 in the direction along the rotation axis A, but the boundary between the tip region 10I and the base region 10H may also be located closer to the second end 10B than the sensor portion 20.

[0092] (Embodiment 4) Next, a fourth embodiment, which is yet another embodiment of the present disclosure, will be described. FIG. 22 is a schematic perspective view showing the structure of the milling tool in the fourth embodiment. FIG. 23 is a schematic perspective view showing the milling tool in the fourth embodiment disassembled. With reference to FIG. 22 and FIG. 23, the milling tool 1 of this embodiment basically has a structure similar to that of the milling tool 1 of the first embodiment described based on FIG. 1 to FIG. 19, operates in the same manner, and exerts the same effects. However, the milling tool 1 of the fourth embodiment is different from the first embodiment in that a portion corresponding to the sensor device of the present disclosure including the sensor unit 20, a portion including the first end 10A, and a portion including the second end 10B are each separable.

[0093] 22 and 23, the shaft portion 10 of the cutting tool 1 in embodiment 4 has a tip region 10J as a machining unit including a first end portion 10A, and a base region 10L including a second end portion 10B, which are separable from an intermediate region 10K as a shaft region of a sensor device including an area surrounded by the sensor portion 20.

[0094] A recess 19C is formed at the end of the tip region 10J on the second end 10B side. The recess 19C is an area recessed in a direction along the rotation axis A toward the first end 10A side. A protrusion 19D is formed as a connection part at the end of the intermediate region 10K on the first end 10A side. The protrusion 19D is an area protruding in a direction along the rotation axis A toward the first end 10A side. The recess 19C is a recess having a shape corresponding to the shape of the protrusion 19D. The recess 19C and the protrusion 19D are configured to be able to engage with each other.

[0095] A recess 19E is formed at the end of the intermediate region 10K on the second end 10B side. The recess 19E is a region recessed in a direction along the rotation axis A toward the first end 10A side. A protrusion 19F is formed at the end of the base end region 10L on the first end 10A side. The protrusion 19F is a region protruding in a direction along the rotation axis A toward the first end 10A side. The recess 19E is a recess having a shape corresponding to the shape of the protrusion 19F. The recess 19E and the protrusion 19F are configured to be able to engage with each other.

[0096] By engaging the recess 19C with the protrusion 19D, the tip region 10J and the intermediate region 10K are integrated. Furthermore, by engaging the recess 19E with the protrusion 19F, the intermediate region 10K and the base region 10L are integrated. This provides a milling tool 1 similar to that of the first embodiment. By releasing the engagement between the recess 19C and the protrusion 19D, the tip region 10J and the intermediate region 10K can be separated. By releasing the engagement between the recess 19E and the protrusion 19F, the intermediate region 10K and the base region 10L can be separated.

[0097] In the milling tool of the present disclosure, the shaft portion may be an inseparable integral member as in the first embodiment, or the shaft portion may be separable as in the third and fourth embodiments. The sensor device of the present disclosure may be one that constitutes a sensor portion that is separable from the shaft portion as in the first embodiment, or one that is integral with a part of the shaft portion and that is connected to another part of the shaft portion to form an integral shaft portion as in the third and fourth embodiments.

[0098] (Embodiment 5) Next, a fifth embodiment, which is an example of the cutting tool system of the present disclosure, will be described. Fig. 24 is a schematic diagram showing the configuration of the cutting tool system in the fifth embodiment. Fig. 24 is a diagram showing a state in which the cutting tool and the receiver included in the cutting tool system are installed in an operable state. In Fig. 24, the XY plane corresponds to the horizontal plane, and the Z direction corresponds to the vertical direction.

[0099] 24, a cutting tool system 200 of the present embodiment includes the cutting tool 1 of the above-mentioned first embodiment and a receiver 100. Receiver 100 includes a main body 101 and a linear antenna 102 installed on main body 101. Linear antenna 102 is a receiving antenna that receives a signal S including information on strain and acceleration transmitted from an antenna (transmitting antenna) of cutting tool 1. Linear antenna 102 is, for example, a monopole antenna or a dipole antenna.

[0100] In this embodiment, the cutting tool 1 is installed so that the rotation axis A is aligned along the Z-axis direction, which is a vertical direction, in consideration of ease of installation and operation. On the other hand, the receiver 100 is installed, for example, on a side wall surface in a room in which the cutting tool 1 is installed. At this time, the linear antenna 102 of the receiver 100 is installed so as to be aligned along the Z-axis direction, which is a vertical direction, in consideration of avoiding interference with other equipment. Here, as described with reference to FIG. 14 in the above-mentioned embodiment 1, in the cutting tool 1 of this embodiment, the first direction α, which is a direction perpendicular to the mounting surface 440A of the third part 440 on which the wireless communication unit 51 including the antenna 51A, which is a transmitting antenna, is mounted, is inclined with respect to both the plane β (XY plane) perpendicular to the rotation axis A and the rotation axis A (Z-axis direction). That is, the first direction α is non-parallel to all of the X-axis, Y-axis, and Z-axis.

[0101] This makes it possible to avoid occurrence of a timing at which the electric field strength of the polarized wave in the direction in which the signal S is easily received by the linear antenna 102, which is the receiving antenna, becomes extremely weak when the turning tool 1 transmits the signal S while rotating around the rotation axis A. As a result, the turning tool system 200 of this embodiment is a turning tool system that suppresses loss of information obtained by the strain sensor 31 etc., while easily allowing the signal S including the information to be received by the externally installed receiver 100.

[0102] 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]

[0103] 1 turning tool, 10 shaft portion, 10A first end portion, 10B second end portion, 10C through hole, 10D first protruding portion, 10E second protruding portion, 10F tapered portion, 10G groove portion, 10H base end region, 10I tip region, 10J tip region, 10K intermediate region, 10L base end region, 11 main body portion, 11A first small diameter portion, 11B second small diameter portion, 12 enlarged diameter portion, 12A outer peripheral surface, 12B outer peripheral surface, 13 recess, 15 second recess, 16 first recess, 16A bottom surface, 19A male thread portion, 19B female thread portion, 19C recess, 19D protruding portion, 19E recess, 19F protruding portion, 20 sensor portion, 21 case, 22 bottom wall portion (lid) 22A through hole, 23 Side wall portion, 24 Upper wall portion, 30 Sensor component, 31 Strain sensor, 32 Wiring, 33 Connector, 40 Board module, 49 Board, 49B Main body portion, 51 Wireless communication portion, 51A Antenna, 52 Acceleration sensor, 53 Socket, 54 AD converter, 55 Power supply circuit, 56 Battery socket, 57 Charging connector, 58 Power switch, 59 Through hole, 61 Case body, 61A Through hole, 62 Screw hole, 63 First fixing member, 63A Inner surface, 64 Screw hole, 65 Second fixing member, 65A Inner surface, 66 Screw hole, 72 Reinforcing plate, 80 Sensor module, 91 Cutting tip, 92 Screw, 99 Battery, 100 Receiver, 101 Main body, 102 Linear antenna, 200 Turning tool system, 410 First portion, 410A Bendable portion, 410B first main surface, 410C second main surface, 411 first section first section, 412 first section second section, 413 first section third section, 414 first section fourth section, 415 first section fifth section, 416 first section sixth section, 417 first section seventh section, 418 first section eighth section, 419 first section ninth section, 420 2nd part, 420A Bendable part, 420B 3rd main surface, 420C 4th main surface, 421 2nd part 1st area, 422 2nd part 2nd area, 423 2nd part 3rd area, 424 2nd part 4th area, 425 2nd part 5th area, 426 2nd part 6th area, 430 1st connection part, 440 3rd part, 440A Mounting surface, 450 2nd connection, 460 4th part, 470 3rd connection part, A Rotation axis, L A Perpendicular, L BPerpendicular, d1 depth, d2 depth, α first direction, β plane, γ connection direction, θ angle.

Claims

1. A shaft portion having a cutting edge disposed around a rotation axis, a sensor module including a sensor and a substrate electrically connected to the sensor, and comprising: the substrate is a first portion having a first main surface and a second main surface, the first main surface being disposed to face the outer peripheral surface of the shaft portion; and a second portion having a third main surface and a fourth main surface, the third main surface facing the shaft portion, the second portion being disposed on the outer peripheral side of the first portion in the radial direction of the shaft portion and being electrically connected to the first portion, the turning tool comprising:

2. The turning tool according to claim 1, wherein the first portion and the second portion are electrically connected by a connecting portion including a flexible substrate.

3. The turning tool according to claim 1, wherein the sensor module further includes an antenna for transmitting a signal including information on a physical quantity detected by the sensor to the outside.

4. The turning tool according to claim 1, wherein the sensor module further includes a battery and a power switch for switching the power supply state from the battery.

5. The turning tool according to any one of claims 1 to 4, wherein the sensor module further includes an AD converter for converting an analog signal including a physical quantity detected by the sensor into a digital signal.

6. A sensor device capable of configuring the sensor portion in a turning tool including a shaft portion and a sensor portion, the sensor portion including a sensor module including a sensor and a substrate electrically connected to the sensor, the substrate is a first portion having a first main surface and a second main surface, the first main surface being disposed to face the outer peripheral surface of the shaft portion; and a second portion having a third main surface and a fourth main surface, the third main surface facing the shaft portion side, the second portion being disposed on the outer peripheral side of the first portion in the radial direction of the shaft portion and being electrically connected to the first portion, the sensor device comprising:

7. A sensor device including a sensor portion, the sensor device further including a shaft region and a connection portion formed at an end in a direction along the rotation axis of the shaft region and to which a processing unit having a cutting edge can be connected, the sensor portion including a sensor module including a sensor and a substrate electrically connected to the sensor, the substrate is a first portion having a first main surface and a second main surface, the first main surface being disposed to face the outer peripheral surface of the shaft region; A sensor device including a second portion having a third main surface and a fourth main surface, the second portion being disposed on an outer peripheral side of the first portion in a radial direction of the shaft region such that the third main surface faces the shaft region, and the second portion being electrically connected to the first portion.

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