Milling tool, milling tool system and sensor device

Abstract

The milling tool includes: a shaft portion extending from a first end portion to a second end portion along a rotation axis; a sensor part disposed on the shaft part; and a cutting edge disposed around the rotation axis of the shaft portion. The sensor portion includes a sensor module including: a first sensor that detects a first physical quantity of the shaft portion; a base member; and an antenna that is mounted on the first surface of the base member and that transmits to the outside a signal including information on the first physical quantity detected by the first sensor. The antenna is a patch antenna or a pattern antenna. In a cross-section including the rotation axis, a first direction perpendicular to the first surface is inclined with respect to a plane perpendicular to the rotation axis and the rotation axis.

Description

Technical Field

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

[0002] In processing based on cutting tools, there is known a technology for grasping the state of the cutting tool by measuring the physical quantity of the cutting tool using a sensor (for example, refer to U.S. Patent Application Publication No. 2015 / 0261207 (Patent Document 1), Japanese Patent Publication No. 2018-54611 (Patent Document 2), Japanese Patent Publication No. 2009-285804 (Patent Document 3), International Publication No. 2017 / 002762 (Patent Document 4), Japanese Patent No. 5988066 (Patent Document 5), Japanese Utility Model Registration No. 3170029 (Patent Document 6), Japanese Patent Publication No. 2015-77658 (Patent Document 7), International Publication No. 2015 / 056495 (Patent Document 8), European Patent Application Publication No. 3292929 (Patent Document 9), and European Patent Application Publication No. 3292930 (Patent Document 10)).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: U.S. Patent Application Publication No. 2015 / 0261207

[0006] Patent Document 2: Japanese Patent Application Publication No. 2018-54611

[0007] Patent Document 3: Japanese Patent Application Publication No. 2009-285804

[0008] Patent Document 4: International Publication No. 2017 / 002762

[0009] Patent Document 5: Japanese Patent Application Publication No. 2016-221665

[0010] Patent Document 6: Japanese Utility Model Registration No. 3170029

[0011] Patent Document 7: Japanese Patent Application Publication No. 2015-77658

[0012] Patent Document 8: International Publication No. 2015 / 056495

[0013] Patent document 9: European Patent Application Publication No. 3292929

[0014] Patent document 10: European Patent Application Publication No. 3292930 Summary of the invention

[0015] The milling tool according to the present disclosure comprises: a shaft portion extending from a first end portion to a second end portion along a rotation axis; a sensor portion arranged on the shaft portion; and a cutting edge arranged around the rotation axis of the shaft portion. The sensor portion includes a sensor module, which includes: a first sensor for detecting a first physical quantity of the shaft portion; a base member; and an antenna mounted on a first surface of the base member for transmitting a signal containing information of the first physical quantity detected by the first sensor to the outside. The antenna is a patch antenna or a pattern antenna. In a cross section including the rotation axis, a first direction perpendicular to the first surface is inclined relative to a plane perpendicular to the rotation axis and the rotation axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic perspective view showing the structure of a milling tool.

[0017] Figure 2 It is a schematic perspective view showing the structure of the shaft portion.

[0018] Figure 3 It means from Figure 2 A schematic perspective view of the structure of the shaft portion when viewed from different viewpoints.

[0019] Figure 4 It is a schematic plan view showing the structure of the shaft portion when viewed from the first end side along the rotation axis direction.

[0020] Figure 5 It is a schematic plan view showing the structure of the shaft portion when viewed from the second end side along the rotation axis direction.

[0021] Figure 6 It is a schematic plan view showing the structure of the shaft portion when viewed in a direction perpendicular to the axial direction.

[0022] Figure 7 It means along Figure 5 A schematic cross-sectional view of the cross section taken along line segment VII-VII.

[0023] Figure 8 It is a schematic cross-sectional view showing the structure near the sensor unit.

[0024] Fig. 9 It is a schematic perspective view showing the structure of a strain sensor component.

[0025] Fig.10 It is a schematic plan view showing the structure of a substrate module.

[0026] Fig.11 It means along Fig.10 A schematic cross-sectional view of the cross section taken along line segment XI-XI.

[0027] Fig.12It means along Fig.10 A schematic cross-sectional view of the cross section taken along line segment XII-XII.

[0028] Fig.13 It is a schematic plan view showing a state where the substrate module is mounted.

[0029] Fig.14 It means along Fig.13 A schematic cross-sectional view of the section taken along line segment XIV-XIV.

[0030] Fig.15 It means along Fig.13 A schematic cross-sectional view of the cross section taken along line segment XV-XV.

[0031] Fig.16 It is a schematic perspective view showing the structure of the casing body.

[0032] Fig.17 It is a schematic perspective view showing the structure of the first fixing member.

[0033] Fig.18 It is a schematic perspective view showing the structure of the second fixing member.

[0034] Fig.19 It is a schematic perspective view showing the structure of the cover (bottom wall portion).

[0035] Fig. 20 It is a schematic perspective view showing the structure of a milling tool according to a second embodiment.

[0036] Fig.21 It is a schematic perspective view showing the structure of a milling tool according to a third embodiment.

[0037] Fig. 22 It is a schematic perspective view showing the structure of a milling tool according to a fourth embodiment.

[0038] Fig.23 It is a schematic perspective view showing a disassembled state of a milling tool according to a fourth embodiment.

[0039] Fig.24 It is a schematic diagram showing the configuration of a milling tool system according to a fifth embodiment. DETAILED DESCRIPTION

[0040] [Problems to be Solved by the Present Disclosure]

[0041] From the viewpoint of grasping the state of a cutting tool during machining in detail, it is required to receive a signal containing information obtained by a sensor in an external receiver while suppressing the loss of information. One of the objects of the present disclosure is to provide a milling tool, a milling tool system, and a sensor device that can easily receive a signal containing the information obtained by a sensor in an external receiver while suppressing the loss of the information obtained by the sensor.

[0042] [Effects of the present disclosure]

[0043] According to the milling tool, milling tool system and sensor device disclosed herein, it is possible to provide a milling tool, milling tool system and sensor device that can easily receive a signal containing information in an external receiver while suppressing loss of information obtained by a sensor.

[0044] [Description of Embodiments of the Present Disclosure]

[0045] First, the embodiments of the present disclosure are listed for explanation. The milling tool of the present disclosure comprises: a shaft portion extending from a first end portion to a second end portion along a rotation axis; a sensor portion arranged on the shaft portion; and a cutting edge arranged around the rotation axis of the shaft portion. The sensor portion includes a sensor module, which includes: a first sensor for detecting a first physical quantity of the shaft portion; a base member; and an antenna mounted on a first surface of the base member for sending a signal containing information of the first physical quantity detected by the first sensor to the outside. The antenna is a patch antenna or a pattern antenna. In a cross section including the rotation axis, a direction perpendicular to the first surface, i.e., a first direction, is inclined relative to a plane perpendicular to the rotation axis and the rotation axis.

[0046] In a milling tool that cuts a workpiece by rotating around the rotation axis of the shaft, when a signal containing information obtained by a sensor is received in an external receiver, there is a tendency for the loss of information to become larger. According to the research of the inventor of the present invention, the reason is as follows. The patch antenna and pattern antenna (transmitting antenna) included in the milling tool are mounted on the mounting surface (first surface) of the base member included in the milling tool. At this time, from the perspective of the ease of setting the communication module including the transmitting antenna, there is a tendency for the direction perpendicular to the mounting surface to be parallel or perpendicular to the surface perpendicular to the rotation axis of the shaft. In addition, from the perspective of the ease of setting the receiver including a linear antenna (receiving antenna) such as a monopole antenna and a dipole antenna that receives the above-mentioned signal, there is a tendency for the long side direction of the linear antenna included in the receiver to be parallel or perpendicular to the surface perpendicular to the rotation axis of the shaft. Therefore, with the rotation of the milling tool around the rotation axis, there is a possibility that the direction perpendicular to the mounting surface of the above-mentioned transmitting antenna and the long side direction of the receiving antenna are orthogonal. At this time, the electric field strength of the polarized wave in the direction that the receiving antenna can easily receive in the transmitted signal becomes extremely weak. As a result, the information received by the receiving antenna includes a large amount of information missing from the information included in the transmitted signal.

[0047] In the milling tool disclosed in the present invention, the first direction, which is a direction perpendicular to the first surface of the base member on which the transmitting antenna is mounted, is inclined relative to both the plane perpendicular to the rotation axis and the rotation axis. Thus, it is possible to avoid the occurrence of a time when the electric field intensity of the polarized wave in the direction that the receiving antenna can easily receive becomes extremely weak. As a result, it is easy to receive a signal containing the information obtained by the sensor in a receiver disposed outside while suppressing the loss of the information.

[0048] Alternatively, in the above-mentioned milling tool, the angle formed by the plane perpendicular to the rotation axis and the first direction is greater than 5° and less than 85°. According to this configuration, the loss of information obtained by the sensor can be further suppressed. It should be noted that in the present application, the angle formed by the plane perpendicular to the rotation axis and the first direction refers to the angle formed by the plane perpendicular to the rotation axis and the first direction that forms an acute angle.

[0049] In the above-mentioned milling tool, an angle formed by a plane perpendicular to the rotation axis and the first direction may be greater than or equal to 15° and less than or equal to 75°. According to this configuration, loss of information obtained by the sensor can be further suppressed.

[0050] In the above-mentioned milling tool, an angle formed by a plane perpendicular to the rotation axis and the first direction may be greater than or equal to 20° and less than or equal to 70°. According to this configuration, loss of information obtained by the sensor can be further suppressed.

[0051] In the above-mentioned milling tool, the base member may be a substrate. According to this configuration, an antenna (transmitting antenna) as a patch antenna or a pattern antenna can be easily provided.

[0052] In the above-mentioned milling tool, the first sensor may be a strain sensor. According to this configuration, it is possible to obtain information on strain that is important for understanding the state of the milling tool.

[0053] In the above-mentioned milling tool, the first sensor as a strain sensor may be arranged to detect strain in a direction along the rotation axis. According to this configuration, information on the strain in the direction along the rotation axis, which is important for understanding the state of the milling tool, can be obtained.

[0054] Alternatively, in the above-mentioned milling tool, the sensor portion further includes a housing for accommodating the sensor module. Alternatively, the housing includes: a cylindrical side wall portion surrounding the shaft portion and extending in the direction along the rotation axis; a bottom wall portion closing a first opening of the side wall portion in the direction along the rotation axis; and an upper wall portion closing a second opening of the side wall portion located on a side opposite to the first opening in the direction along the rotation axis. Alternatively, at least a portion of at least one of the bottom wall portion and the upper wall portion is made of resin.

[0055] By making a part of the housing made of resin, it is easy to transmit the signal from the antenna to the outside. By having at least one of the bottom wall and the upper wall of the housing, which have little influence on the rigidity, a decrease in the rigidity of the housing can be suppressed.

[0056] The milling tool system of the present disclosure includes: the milling tool of the present disclosure described above; and a receiver including a linear antenna for receiving a signal including information on a first physical quantity transmitted from the antenna (transmitting antenna).

[0057] The milling tool system of the present disclosure includes the above-mentioned milling tool of the present disclosure, and while suppressing the loss of information obtained by the sensor, it is easy for the receiver to receive a signal including the information.

[0058] The sensor device of the first aspect of the present disclosure is a sensor device that can constitute a sensor portion of a milling tool, and the milling tool includes: a shaft portion extending from a first end portion to a second end portion along a rotation axis; a sensor portion arranged on the shaft portion; and a cutting edge arranged around the rotation axis of the shaft portion. The sensor device includes a sensor module, and the sensor module includes: a first sensor that detects a first physical quantity of the shaft portion; a base member; and an antenna that is mounted on a first surface of the base member and sends a signal containing information about the first physical quantity detected by the first sensor to the outside. The antenna is a patch antenna or a pattern antenna. In a cross-section including the above-mentioned rotation axis, a direction perpendicular to the first surface, i.e., a first direction, is inclined relative to a plane perpendicular to the rotation axis and the rotation axis.

[0059] The sensor device of the second aspect of the present disclosure comprises: an axis region extending along the rotation axis; a sensor portion arranged in the axis region; and a connection portion formed at the end of the axis region in the direction along the rotation axis, which can be connected to a processing unit having a cutting edge. The sensor portion includes a sensor module, which includes: a first sensor for detecting a first physical quantity in the axis region; a base member; and an antenna mounted on a first surface of the base member for transmitting a signal containing information about the first physical quantity detected by the first sensor to the outside. The antenna is a patch antenna or a pattern antenna. In a cross section containing the rotation axis, a first direction perpendicular to the first surface is inclined relative to a plane perpendicular to the rotation axis and the rotation axis.

[0060] In the sensor device disclosed in the present invention, the first direction, which is a direction perpendicular to the first surface of the base member on which the transmitting antenna is mounted, is inclined relative to both the plane perpendicular to the rotation axis and the rotation axis. Thus, it is possible to avoid the occurrence of a time when the electric field intensity of the polarized wave in the direction that the receiving antenna can easily receive becomes extremely weak. As a result, it is easy to receive a signal containing the information obtained by the sensor in a receiver provided externally while suppressing the loss of the information.

[0061] [Details of the embodiments of the present invention]

[0062] Next, embodiments of the milling tool according to the present disclosure will be described below with reference to the accompanying drawings. It should be noted that in the following drawings, the same or corresponding parts are denoted by the same reference numerals, and their description will not be repeated.

[0063] (First Embodiment)

[0064] (Overview of the structure of the milling tool)

[0065] Figure 1 This is a schematic perspective view showing the structure of a milling tool. Figure 1The structure of the milling tool is briefly described. The milling tool 1 of the present 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 configured in a manner that surrounds a portion of the long side direction of the shaft portion 10. On the shaft portion 10, a plurality of (four in this case) opening recesses 13 are formed at equal intervals in the circumferential direction at the first end portion 10A and the outer peripheral surface. A cutting blade 91 serving as a cutting edge is mounted on a wall surface defining the recess 13. The cutting blade 91 is configured around the rotation axis A of the shaft portion 10. The milling tool 1 is rotated around the rotation axis A so that the cutting blade 91 contacts a workpiece (not shown) so that the workpiece can be processed. That is, the milling tool 1 is a milling tool that cuts a workpiece by rotating around the rotation axis A of the shaft portion 10.

[0066] (Shaft structure)

[0067] Next, each part of the milling tool will be described in detail. Figure 2 It is a schematic perspective view showing the structure of the shaft portion when viewed from the second end portion 10B side. Figure 3 It is a schematic perspective view showing the structure of the shaft portion when viewed from the first end portion 10A side. Figure 4 It is a schematic plan view showing the structure of the shaft portion when viewed from the first end side along the rotation axis direction. Figure 5 It is a schematic plan view showing the structure of the shaft portion when viewed from the second end side along the rotation axis direction. Figure 6 It is a schematic plan view showing the structure of the shaft portion when viewed in a direction perpendicular to the axial direction. Figure 7 It means along Figure 5 A schematic cross-sectional view of the cross section taken along line segment VII-VII. Figure 2 to Figure 7 , the structure of the shaft portion 10 will be described.

[0068] Reference Figure 2 as well as Figure 3 The shaft portion 10 includes a main body portion 11 and an expanded diameter portion 12 as a first area. 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 with a larger diameter than the main body portion 11. The position of the expanded diameter portion 12 in the long side direction of the main body portion 11 is not particularly limited, but in the present embodiment, it is arranged in the central portion in the long side direction of the main body portion 11. The expanded diameter portion 12 is arranged in the area of ​​the shaft portion 10 surrounded by the sensor portion 20.

[0069] Reference Figure 2 to Figure 4 As described above, the cutting insert 91 is mounted on the wall surface defining the recessed portion 13 of the shaft portion 10. The cutting insert 91 is fixed to the shaft portion 10 by inserting and tightening the screw 92 into the threaded hole formed in the cutting insert 91.

[0070] Reference Figure 2 to Figure 6 The enlarged diameter portion 12 has an octagonal column shape. Figure 4 as well as Figure 5 , when viewed in the direction along the rotation axis A, the enlarged diameter portion 12 has an octagonal shape. More specifically, the enlarged diameter portion 12 has an octagonal shape obtained by removing four right-angled isosceles triangles of the same shape from the four corners of a square in a cross section perpendicular to the rotation axis A. The rotation axis A passes through the center of gravity of the octagon. The shape of the octagon is the same in the direction along the rotation axis A. The central axis of the main body 11 is consistent with the central axis of the enlarged diameter portion 12. Here, the central axis of the enlarged diameter portion 12 refers to a straight line passing through the center of gravity of the above-mentioned octagon.

[0071] Reference Figure 4 as well as Figure 5 When viewed in the direction along the rotation axis A, the octagon is composed of outer peripheral surfaces 12A corresponding to long sides and outer peripheral surfaces 12B corresponding to short sides shorter than the long sides, which are arranged alternately. A perpendicular line L passing through the rotation axis A of each surface of the outer peripheral surface 12A and the outer peripheral surface 12B of the expanded diameter portion 12 corresponding to each side of the octagon adjacent in the circumferential direction is A , vertical line L B The angles θ formed by the two sides are equal to each other. Specifically, the angle θ is 45°. It should be noted that the shape of the octagon is not limited to the above shape, and when viewed in the direction along the rotation axis A, the lengths of the outer peripheral surface 12A and the outer peripheral surface 12B may be the same.

[0072] Reference Figure 2 to Figure 6 A first recess 16 extending in the direction along the rotation axis A is formed on each outer peripheral surface 12B. A bottom surface 16A defining the first recess 16 is a flat surface. The first recess 16 is arranged at a position parallel to the vertical line L B The first recess 16 penetrates the outer peripheral surface 12B in the direction along the rotation axis A. The second recess 15 extending in the circumferential direction of the expanded diameter portion 12 is formed on the outer peripheral surface 12A and the outer peripheral surface 12B of the expanded diameter portion 12. The second recess 15 is formed 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 over the entire circumference of the outer peripheral surface 12A and the outer peripheral surface 12B of the expanded diameter portion 12. That is, the second recess 15 is formed in an annular shape.

[0073] Reference Figure 6 as well as Figure 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 other portions is formed at the boundary portion between the first end 10A side of the main body 11 and the enlarged diameter portion 12. A second small diameter portion 11B having a smaller diameter than other portions is formed at the boundary portion between the second end 10B side of the main body 11 and the enlarged diameter portion 12. A through hole 10C is formed in the shaft portion 10, penetrating the shaft portion 10 in the direction along the rotation axis A. The through hole 10C extends in a manner that includes the rotation axis A.

[0074] (Sensor Section Structure)

[0075] Next, refer to Figures 8 to 19 , the structure of the sensor unit 20 is described. The sensor unit 20 corresponds to one embodiment of the sensor device disclosed in the present invention. Figure 8 as well as Fig.10 The sensor unit 20 includes a sensor module 80 and a housing 21 for accommodating the sensor module 80. The sensor module 80 includes a plurality of strain sensors 31 as first sensors, a substrate 49 electrically connected to the strain sensors 31, and a wireless communication unit 51 electrically connected to the substrate 49 (see Fig.10 The strain sensor 31 detects the strain as the first physical quantity of the shaft portion 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.

[0076] Reference Fig. 9 The strain sensor 31 constitutes the strain sensor component 30. The strain sensor component 30 includes the strain sensor 31 and a wiring 32 connected to the strain sensor 31 and having a connector 33 at the front end. The wiring 32 has a strip shape. The strain sensor 31 is arranged near one end of the wiring 32. The connector 33 is arranged at the other end of the wiring 32.

[0077] Reference Figure 10 to Figure 12 The substrate 49 constitutes the substrate module 40. The 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 formed on the surface of the substrate body.

[0078] Reference Fig.10The substrate module 40 includes a substrate 49, a wireless communication unit 51, an acceleration sensor 52 as a second sensor, a socket 53, an AD converter 54, a power 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 circuit 55, the battery socket 56, the charging connector 57, and the power switch 58 are arranged on the substrate 49 and electrically connected to the substrate 49 (the circuit pattern of the substrate 49). The acceleration sensor 52 detects the acceleration as the second physical quantity of the shaft 10. A plurality of acceleration sensors 52 are arranged on the substrate 49. The wireless communication unit 51 is electrically connected to the acceleration sensor 52 via the substrate 49. The antenna 51A of the wireless communication unit 51 transmits a signal including information on the acceleration of the shaft 10 detected by the acceleration sensor 52 to the outside.

[0079] The substrate 49 includes a first portion 410, a second portion 420, a first connection portion 430, a third portion 440, a second connection portion 450, a fourth portion 460, and a third connection portion 470. The first portion 410 and the second portion 420 each have a strip shape. Fig.10 as well as 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.

[0080] Reference Fig.11 The first part 410 includes a main body 49B as a substrate (flexible substrate) having flexibility, and a reinforcing plate 72 provided on one main surface of the main body 49B (the main surface on the side opposite to the side on which the circuit pattern is formed) and having a Young's modulus greater than that of the main body 49B. The reinforcing plates 72 are respectively arranged in the areas corresponding to the first part first region 411, the first part second region 412, the first part third region 413, the first part fourth region 414, the first part fifth region 415, the first part sixth region 416, the first part seventh region 417, the first part eighth region 418, and the first part ninth region 419. The reinforcing plate 72 is not arranged in the area corresponding to the bendable part 410A. As a result, the bendable part 410A can be bent.

[0081] Reference Fig.10 as well as Fig.11In the first portion first region 411 and the first portion ninth region 419, one or more (here, a plurality, specifically two) through holes 59 are formed that penetrate the first portion 410 in the thickness direction. The two through holes 59 are arranged in a direction intersecting (orthogonal) with the long side direction of the first portion 410, that is, in the width direction of the first portion 410. The socket 53 is arranged in the first portion first region 411, the first portion third region 413, the first portion fifth region 415, and the first portion seventh region 417. The socket 53 is arranged at the end of the width direction of the first portion 410. The acceleration sensor 52 is arranged in the first portion second region 412, the first portion fourth region 414, and the first portion sixth region 416. The AD converter 54 is arranged in the first portion fourth region 414. In the first portion fourth region 414, the acceleration sensor 52 and the AD converter 54 are arranged in the width direction of the first portion 410.

[0082] Reference Fig.10 as well as Fig.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.

[0083] Reference Fig.12 The second part 420 includes a main body 49B as a flexible substrate, and a reinforcing plate 72 provided on one main surface of the main body 49B (the main surface on the side opposite to the side where the circuit pattern is formed) and having a greater Young's modulus than the main body 49B. The reinforcing plates 72 are respectively arranged in the areas corresponding to the second part first region 421, the second part second region 422, the second part third region 423, the second part fourth region 424, the second part fifth region 425, and the second part sixth region 426. The reinforcing plate 72 is not arranged in the area corresponding to the bendable portion 420A. As a result, the bendable portion 420A can be bent.

[0084] Reference Fig.10 as well as Fig.12, through holes 59 penetrating the second part 420 in the thickness direction are formed in the second part first area 421 and the second part sixth area 426, respectively. A battery socket 56 is arranged in the second part first area 421 and the second part sixth area 426, respectively. The battery socket 56 is arranged in the central part of the width direction of the second part 420. The connection direction of the battery socket 56 (the connection direction γ of the connector connected to the battery socket 56) is a direction along the width direction of the second part 420. As described later, when the substrate module 40 is accommodated in the housing 21, the connection direction γ of the battery socket 56 is a direction along the rotation axis A. The power supply circuit 55 is arranged in the second part second area 422 and the second part fifth area 425, respectively. A charging connector 57 is arranged in the second part third area 423.

[0085] The first part sixth area 416 and the second part fourth area 424 are physically and electrically connected by the first connection part 430 having a strip shape. The first connection part 430, the main body 49B of the first part 410, and the main body 49B of the second part 420 are composed of an integrated flexible substrate. That is, the first part 410, the second part 420, and the first connection part 430 are included in an integrated flexible substrate that extends over the entirety of the first part 410, the second part 420, and the first connection part 430. The first part eighth area 418 and the third part 440 are physically and electrically connected by the second connection part 450. The wireless communication unit 51 including the antenna 51A is arranged on the third part 440. The second part third area 423 and the fourth part 460 are physically and electrically connected by the third connection part 470. The power switch 58 is arranged on the fourth part 460. The substrate 49 is provided with a reinforcing plate at a portion that requires rigidity in the integrated flexible substrate, and can be bent at a portion where the reinforcing plate is not provided.

[0086] Reference Fig.10 as well as Figure 5 The lengths of 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 in the long side direction of the first portion 410 correspond to the lengths of the outer peripheral surface 12B, which is the short side of the octagon, when the enlarged diameter portion 12 is viewed in the direction along the rotation axis A. The lengths of 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 in the long side direction of the first portion 410 correspond to the lengths of the outer peripheral surface 12A, which is the long side of the octagon, when the enlarged diameter portion 12 is viewed in the direction along the rotation axis A.

[0087] Next, the arrangement of the strain sensor component 30 and the substrate module 40 with respect to the shaft portion 10 is described. The strain sensor component 30 is arranged so that the strain sensor 31 straddles the second recess 15 and the strain sensor 31 is accommodated in the first recess 16 (see Figure 2 , Figure 4 , Figure 8 In other words, the strain sensor 31 is configured to detect strain in the direction along the rotation axis A. The strain sensor components 30 are respectively provided on the four outer peripheral surfaces 12B. As a result, when viewed in the direction along the rotation axis A, the strain sensor 31 is arranged on the perpendicular line L passing through the rotation axis A in the outer peripheral surface of the enlarged diameter portion 12 corresponding to each side of the octagon. B All outer peripheral surfaces 12B (outer peripheral surfaces corresponding to the short sides) of the enlarged diameter portion 12 are arranged at 90 degrees to each other.

[0088] Reference Figure 13 to Figure 15 The first part 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 part 410 is arranged in a manner that the first main surface 410B faces the outer peripheral surface of the shaft part 10. The wireless communication part 51, the acceleration sensor 52, the socket 53, the AD converter 54, etc. are mounted on the second main surface 410C. The first part 410 is wound around the enlarged diameter part 12 in a manner that the first main surface 410B contacts the outer peripheral surface 12A and the outer peripheral surface 12B of the enlarged diameter part 12. At this time, the first part first region 411, the first part third region 413, the first part fifth region 415, the first part seventh region 417, and the first part ninth region 419 are arranged on the outer peripheral surface 12B, and the first part second region 412, the first part fourth region 414, the first part sixth region 416, and the first part 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 so that the through holes 59 formed therein coincide with each other. The first portion 410 is fixed to the shaft portion 10 by providing a fixing member (not shown) penetrating the through hole 59.

[0089] As a result, when viewed in the direction along the rotation axis A, the first portion 410 is arranged along the outer peripheral surface 12A and the outer peripheral surface 12B of the enlarged diameter portion 12. The socket 53 is arranged on the first portion 410 located on the outer peripheral surface 12B. Furthermore, the connector 33 located at the end of the wiring 32 connected to the strain sensor 31 is connected to the socket 53. As a result, the first portion 410 is electrically connected to the strain sensor 31. Figure 8As shown in FIG. 1 , the wiring 32 crosses the first portion 410 in the width direction (the direction along the rotation axis A). The wiring 32 is formed in a state of being warped into an arch. That is, the wiring 32 connects the strain sensor 31 and the socket 53 in a loose manner. The acceleration sensor 52 is arranged on the outer peripheral surface of the enlarged diameter portion 12 corresponding to each side of the octagon when viewed in the direction along the rotation axis A, and the perpendicular line L passing through the rotation axis A. A Outer peripheral surfaces 12A (outer peripheral surfaces corresponding to the long sides) of the expanded diameter portion 12 are 90 degrees apart. The strain sensor 31 and the acceleration sensor 52 are arranged on the outer peripheral surfaces 12A and 12B of the expanded diameter portion 12 corresponding to different sides of the octagon.

[0090] Reference Fig.14 as well as Fig.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 of the third main surface 420B in the thickness direction. The second portion 420 is arranged on the outer peripheral side of the first portion 410 in the radial direction of the shaft portion 10 in such a way that the third main surface 420B faces the shaft portion 10. The first connecting portion 430 that electrically connects the first portion 410 and the second portion 420 is arranged between the first portion 410 and the second portion 420 in the radial direction of the shaft portion 10.

[0091] The housing 21 includes: a cylindrical side wall portion 23 that surrounds the shaft portion 10 and extends in the direction along the rotation axis A; a bottom wall portion 22 that closes a first opening of the side wall portion 23 in the direction along the rotation axis A; and an upper wall portion 24 that closes a second opening of the side wall portion that is located on the side opposite 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 configured to extend in the circumferential direction of the shaft portion 10 along the outer peripheral surface of the shaft portion 10. The second portion 420 is configured to extend in the circumferential direction of the side wall portion 23 along the inner peripheral surface of the side wall portion 23. The second portion 420 is bent at the bendable portion 420A. The power supply circuit 55, the battery socket 56, the charging connector 57, etc. are arranged on the third main surface 420B of the second portion 420. At this time, the connection direction γ of the battery socket 56 is along the direction of the rotation axis A.

[0092] Reference Fig.13 as well as Fig.15, the sensor module 80 includes a battery 99. In the present embodiment, the sensor module 80 includes a plurality of (specifically, two) batteries 99. The battery 99 is arranged between the first part 410 and the second part 420 in the radial direction of the shaft 10. The plurality of batteries 99 are arranged at equal intervals in the circumferential direction of the shaft 10. The plurality of batteries 99 are arranged 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, and the AD converter 54 on the first part 410 connected to the second part 420 through the first connecting part 430 via the battery socket 56 and the power supply circuit 55 arranged on the second part 420. The battery 99 is charged via the charging connector 57 arranged on the second part 420. It should be noted that the battery 99 may also be a primary battery.

[0093] 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, by bending the second connection portion 450, the installation state of the wireless communication unit 51 including the antenna 51A is adjusted. Fig.14 , the wireless communication unit 51 including the antenna 51A is mounted on the mounting surface 440A serving as the first surface of the third part 440. That is, in the present embodiment, the base member is a substrate. The base member of the present disclosure is not limited to a substrate, and a supporting member of various shapes having a first surface (mounting surface) on which the antenna 51A (the wireless communication unit 51 including the antenna 51A) is mounted can be used as the base member. Antenna 51A is a patch antenna or a pattern antenna. Antenna 51A is a transmitting antenna that transmits information on a first physical quantity, namely strain, detected by the strain sensor 31 as a first sensor, and information on a second physical quantity, namely acceleration, detected by the acceleration sensor 52 as a second sensor to the outside. In the cross section ( Fig.14 In the cross section shown in FIG. 4 , the first direction α, which is a direction perpendicular to the mounting surface 440A, is inclined relative to the plane β perpendicular to the rotation axis A and the rotation axis A. The angle formed by the plane β perpendicular to the rotation axis A and the first direction α is preferably 5° to 85°, 15° to 75°, and more preferably 20° to 70°. The angle formed by the plane β perpendicular to the rotation axis A and the first direction α can be set to, for example, 30° to 45°.

[0094] 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. By bending the third connection portion 470, the setting state of the power switch 58 can be adjusted. The power switch 58 can switch the supply state of the power from the battery 99 (on or off).

[0095] Next, the arrangement of the housing 21 with respect to the shaft portion 10 will be described. Figure 8 as well as Figures 13 to 19 The housing 21 includes a housing body 61, a first fixing member 63, a second fixing member 65 and a cover 22. Fig.16 As shown, the housing body 61 includes a disc-shaped upper wall portion 24 having a through hole 61A in the center and a cylindrical side wall portion 23 rising from the outer peripheral surface of the upper wall portion 24. A plurality of (here, eight) threaded holes 62 penetrating the upper wall portion 24 in the thickness direction are formed at equal intervals in the circumferential direction on the upper wall portion 24. The material constituting the housing body 61 is, for example, metal. Examples of metals that can be used include aluminum alloys, iron alloys (steels such as stainless steel), and the like.

[0096] Reference Fig.17 , the first fixing member 63 has a circular flat plate shape divided into two. On the first fixing member 63, a plurality of (here, a total of eight in the first fixing member 63 divided into two) threaded holes 64 are formed at equal intervals in the circumferential direction in a manner corresponding to the threaded holes 62 of the upper wall portion 24 of the above-mentioned shell body 61. The inner circumferential surface 63A of the first fixing member 63 has a shape corresponding to the second small diameter portion 11B of the shaft portion 10. When the two first fixing members 63 are combined to form a ring shape, the diameter of the inner circumferential 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, metal. As metals that can be used, aluminum alloys, iron alloys (steels such as stainless steel), etc. can be listed.

[0097] Reference Fig.18 , the second fixing member 65 is a component having a flat arc shape. In the present embodiment, the housing 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 expanded diameter portion 12, that is, a shape corresponding to a part of the octagon. On the second fixing member 65, a plurality of threaded holes 66 (here, each second fixing member 65 is formed with two) are formed in a manner corresponding to the threaded holes 62 of the upper wall portion 24 of the housing body 61 and the threaded holes 64 of the first fixing member 63. The material constituting the second fixing member 65 is, for example, resin.

[0098] Reference Fig.19The cover (bottom wall portion) 22 has a disk-like shape having a through hole 22A at the center. The material constituting the cover 22 is, for example, resin.

[0099] Reference Figure 8 The housing body 61 is arranged so that the main body 11 of the shaft 10 passes through the through hole 61A of the upper wall 24 of the housing body 61. The first fixing member 63 is embedded in the second small diameter portion 11B in a state where the inner peripheral surface 63A contacts the wall surface of the second small diameter portion 11B of the main body 11 while being arranged in contact with the upper wall 24. The second fixing member 65 is arranged so that the inner peripheral surface 65A contacts the outer peripheral surface 12A and the outer peripheral surface 12B of the enlarged diameter portion 12 while being arranged in contact with the first fixing member 63.

[0100] The housing body 61, the first fixing member 63, and the second fixing member 65 are fixed to each other by screws that penetrate the threaded hole 64 of the second fixing member 65, the threaded hole 64 of the first fixing member 63, and reach the threaded 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 housing body 61 coincides with the rotation axis A. In addition, 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 the octagon), so that the housing body 61 is prevented from rotating relative to the shaft portion 10 in the circumferential direction. The cover (bottom wall portion) 22 is fixed to the enlarged diameter portion 12, for example, by screws, etc., in a state of contacting the end surface of the side wall portion 23 and the end surface of the enlarged diameter portion 12. In this way, the housing 21 is fixed to the shaft portion 10 in a state of accommodating the sensor module 80 inside.

[0101] (Motion of milling tool)

[0102] When the milling tool 1 is in motion, the milling tool 1 rotates around the rotation axis A. Then, the workpiece is processed by bringing the cutting blade 91 into contact with 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. After the information of the strain and acceleration as analog signals is converted into digital signals in the AD converter 54, it is transmitted to the outside through the antenna 51A of the wireless communication unit 51. The wireless communication unit 51 and the AD converter 54 are operated by the power supplied from the battery 99 via the battery socket 56 and the power supply circuit 55. The cover (bottom wall portion) 22 of the housing 21 is made of resin, so the wireless communication unit 51 can send signals to the outside through the cover (bottom wall portion) 22. The signal is received and analyzed in a receiver provided outside, thereby grasping the state of the shaft portion 10.

[0103] (Effects of this embodiment)

[0104] In the milling tool 1 of the present embodiment, the first direction α is inclined relative to both the plane β perpendicular to the rotation axis A and the rotation axis A, and the first direction α 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 as the transmitting antenna is mounted. As a result, it is possible to avoid the occurrence of a time when the electric field intensity of the polarized wave in the direction that the receiving antenna can easily receive becomes extremely weak. As a result, the milling tool 1 of the present embodiment is formed as a milling tool that can easily receive a signal containing the information obtained by the strain sensor 31, etc., while suppressing the loss of the information. In the receiver provided outside.

[0105] In addition, in the milling tool 1 of the present embodiment, the bottom wall 22 is made of resin. As a result, it is easy to transmit the signal from the antenna to the outside while suppressing the reduction of the rigidity of the housing 21. It should be noted that the upper wall 24 can be made of resin, or only the bottom wall 22 and a part of the upper wall 24 can be made of resin.

[0106] In addition, in the milling tool 1 of the present embodiment, the battery socket 56, which is a component arranged on the second part 420 arranged on the outer peripheral side of the first part 410, is arranged on the third main surface 420B, which is the main surface facing the shaft portion 10. As a result, the battery socket 56 is prevented from falling off due to centrifugal force. In addition, 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.

[0107] In the milling 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 10. Thus, by placing the battery having a large mass as close to the rotation axis A as possible, the centrifugal force applied to the battery 99 is suppressed.

[0108] In the milling tool 1 of the present embodiment, the first connection portion 430 is a flexible substrate. Thus, by connecting the first portion 410 and the second portion 420 using the flexible substrate, it is easy to properly install the first portion 410 and the second portion 420.

[0109] In addition, in the milling tool 1 of the present embodiment, the first part 410, the second part 420, and the first connecting part 430 include an integrated flexible substrate extending over the entirety of the first part 410, the second part 420, and the first connecting part 430. More specifically, the first connecting part 430, the main body 49B of the first part 410, and the main body 49B of the second part 420 are composed of an integrated flexible substrate. Moreover, a reinforcing plate 72 is provided at a portion of the integrated flexible substrate that requires rigidity, and a portion where the reinforcing plate 72 is not provided can be bent. As a result, a high degree of design freedom is ensured for the substrate module 40.

[0110] In the milling tool 1 of the present embodiment, the connection direction γ of the battery socket 56 is along the rotation axis A. This prevents the connector from coming off the battery socket 56 due to the centrifugal force caused by the rotation of the milling tool 1 .

[0111] In the milling tool 1 of the present embodiment, the first portion 410 is arranged 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 arranged 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. Thus, the first portion 410 and the second portion 420 can be easily fixed.

[0112] In the milling 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 via the second connection portion 450. This increases the degree of freedom in the installation of the wireless communication unit 51 including the antenna 51A.

[0113] In the milling 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 improves the degree of freedom in the installation of the wireless communication unit 51 including the antenna 51A.

[0114] In the milling tool 1 of the present embodiment, the power switch 58 is disposed in the fourth portion 460 electrically connected to the second portion 420 via the third connection portion 470. This increases the degree of freedom in the arrangement of the power switch 58.

[0115] Furthermore, in the milling 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 improves the degree of freedom in the installation of the power switch 58.

[0116] In the milling tool 1 of the present embodiment, the plurality of batteries 99 are arranged at equal intervals in the circumferential direction of the shaft portion 10. By arranging the batteries 99 having a large mass in this manner, stable rotation of the milling tool 1 can be achieved.

[0117] In the milling tool 1 of the present embodiment, the plurality of batteries 99 are arranged symmetrically with respect to the rotation axis A when viewed from the direction of the rotation axis A. By arranging the batteries 99 having a large mass in this manner, stable rotation of the milling tool 1 can be achieved.

[0118] In the milling tool 1 of the present embodiment, the AD converter 54 is disposed on the second main surface 410C. By disposing the AD converter 54 having a relatively large mass on the second main surface 410C close to the rotation axis A, it is possible to suppress the AD converter 54 from falling off due to centrifugal force.

[0119] (Variation Example)

[0120] In the above embodiment, the case where the strain sensor 31 and the acceleration sensor 52 are used as the first sensor and the second sensor, respectively, is described. However, for example, the acceleration sensor 52 as the second sensor may be omitted. In addition, the strain sensor 31 may be omitted and only the acceleration sensor 52 may be used. That is, the first sensor may also be an acceleration sensor. In addition, a sensor that detects other physical quantities other than strain and acceleration (such as a temperature sensor) may be used instead of one or both of the strain sensor 31 and the acceleration sensor 52.

[0121] In the above embodiment, an end mill is described as an example of the milling tool of the present disclosure, but the milling tool of the present disclosure is not limited thereto. The milling tool of the present disclosure may be, for example, a drill, a milling cutter, a boring tool, a reamer, a tap, or the like.

[0122] In the above embodiment, the expanded diameter portion 12 disposed in the region of the shaft portion 10 surrounded by the sensor portion 20 is described as being octagonal when viewed in the direction along the rotation axis A. However, the planar shape of the expanded diameter portion may be any 4n-gon (n is a natural number greater than or equal to 2), for example, a dodecagon, a hexadecagon, or an icosagon.

[0123] In the above embodiment, the strain sensor 31 is described as being arranged on all the outer peripheral surfaces 12B (four surfaces) of the enlarged diameter portion 12 corresponding to the sides of the octagon, where the perpendicular lines passing through the rotation axis A are 90° to each other, but the strain sensor may be arranged on at least two surfaces. To explain more generally, the first outer peripheral surface and the second outer peripheral surface where the perpendicular lines passing through the rotation axis are 90° to each other in relation to the first outer peripheral surface, or the third outer peripheral surface where the perpendicular lines passing through the rotation axis are 180° to each other in relation to the first outer peripheral surface, among the outer peripheral surfaces of the first region (enlarged diameter portion) corresponding to the sides of the 4n-gon, are regarded as a group of outer peripheral surfaces, and strain sensors are arranged on each of the group of outer peripheral surfaces. By providing strain sensors on the first peripheral surface and the second peripheral surface at 90° to each other through the perpendicular lines of the rotation axis, information related to the magnitude and direction of the load acting in the plane perpendicular to the rotation axis can be obtained. In addition, by also providing strain sensors on the third peripheral surface, the influence of the load parallel to the rotation axis can be eliminated, and information related to the magnitude and direction of the load acting in the plane perpendicular to the rotation axis can be obtained more accurately. There can also be multiple sets of peripheral surfaces mentioned above. For example, when there are two sets of peripheral surfaces mentioned above, strain sensors are respectively arranged on each set of peripheral surfaces including two peripheral surfaces or three peripheral surfaces. That is, strain sensors are arranged on a maximum of six peripheral surfaces. There is no angle restriction between two sets of peripheral surfaces.

[0124] In the above embodiment, the first fixing member 63 and the second fixing member 65 are separate bodies. 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.

[0125] In the above embodiment, the sensor unit 20 is mounted on the shaft 10 using the first fixing member 63 and the second fixing member 65, but the mounting method of the sensor unit 20 is not limited thereto. The sensor unit 20 may be mounted on the shaft 10 by other methods such as shrink fitting.

[0126] (Second Embodiment)

[0127] Next, a second embodiment which is another embodiment of the present disclosure will be described. Fig. 20 2 is a schematic perspective view showing the structure of a milling tool according to a second embodiment. Fig. 20 The milling tool 1 of this embodiment basically has the same Figures 1 to 19The milling tool 1 of the first embodiment has the same structure, operates in the same manner, and has the same effects. However, the milling tool 1 of the second embodiment is different from the first embodiment mainly in the structure of the shaft 10 .

[0128] Specifically, refer to Fig. 20 The shaft portion 10 of the present embodiment includes a first protrusion 10D and a second protrusion 10E in a radial direction (a direction perpendicular to the rotation axis A) in a region closer to the second end portion 10B than the sensor portion 20. When viewed from the first protrusion 10D, the second protrusion 10E is disposed on the second end portion 10B side. 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 formed as a groove portion 10G. When viewed from the second protrusion 10E, the region on the opposite side to the first protrusion 10D is formed as a tapered portion 10F whose diameter decreases 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.

[0129] When the milling tool 1 of this embodiment is used, the taper 10F is inserted into a recess formed on the spindle of the machine tool, thereby holding the milling tool 1 on the spindle of the machine tool. The shapes of the taper 10F, the first protrusion 10D, and the second protrusion 10E can be appropriately selected according to the tool holding mechanism of the spindle of the machine tool.

[0130] (Third Embodiment)

[0131] Next, a third embodiment which is still another embodiment of the present disclosure will be described. Fig.21 1 is a schematic perspective view showing the structure of a milling tool according to a third embodiment. Fig.21 The milling tool 1 of this embodiment basically has the same Figures 1 to 19 The milling tool 1 of the first embodiment described has the same structure, operates in the same manner, and has the same effect. However, the milling tool 1 of the third embodiment is different from the first embodiment in that the portion including the sensor portion 20 as the sensor device disclosed herein and the portion including the first end portion 10A can be separated.

[0132] Reference Fig.21 In the shaft portion 10 of the milling tool 1 of the third embodiment, the front end region 10I as a machining unit including the first end portion 10A can be separated at a portion closer to the first end portion 10A than the area surrounded by the sensor portion 20. The portion other than the front end region 10I of the shaft portion 10 is a base end region 10H of the shaft portion region as a sensor device.

[0133] An external thread portion 19A is formed at the end portion on the second end portion 10B side of the front end region 10I. The external thread portion 19A is a cylindrical protrusion that protrudes along the rotation axis A toward the second end portion 10B side. A spiral thread tooth is formed on the outer peripheral surface of the external thread portion 19A. An internal thread portion 19B serving as a connecting portion is formed at the end portion on the first end portion 10A side of the base end region 10H. The internal thread portion 19B is a cylindrical recessed portion that is recessed along the rotation axis A toward the second end portion 10B side. The internal thread portion 19B is a recessed portion having a shape corresponding to the shape of the external thread portion 19A. A spiral thread groove corresponding to the thread tooth of the external thread portion 19A is formed on the inner peripheral surface that defines the internal thread portion 19B.

[0134] By screwing the external thread portion 19A into the internal thread portion 19B, the external thread portion 19A and the internal thread portion 19B are connected, so that the front end region 10I and the base end region 10H are formed as one. Thus, the same milling tool 1 as the first embodiment is obtained. By releasing the connection between the external thread portion 19A and the internal thread portion 19B, the front end region 10I and the base end region 10H can be separated.

[0135] It should be noted that in the above embodiment, the case where the external thread portion 19A is formed in the front end region 10I and the internal thread portion 19B is formed in the base end region 10H is described, but the internal thread portion 19B may be formed in the front end region 10I and the external thread portion 19A may be formed in the base end region 10H.

[0136] In addition, in the above-mentioned embodiment, the situation in which the boundary between the front end region 10I and the base end region 10H exists at a position closer to the first end 10A side than the sensor portion 20 in the direction along the rotation axis A is described, but the boundary between the front end region 10I and the base end region 10H may also exist at a position closer to the second end 10B side than the sensor portion 20.

[0137] (Fourth Embodiment)

[0138] Next, a fourth embodiment which is still another embodiment of the present disclosure will be described. Fig. 22 It is a schematic perspective view showing the structure of a milling tool according to a fourth embodiment. Fig.23 1 is a schematic perspective view showing a disassembled state of a milling tool according to a fourth embodiment. Fig. 22 as well as Fig.23 The milling tool 1 of this embodiment basically has the same Figures 1 to 19The milling tool 1 of the first embodiment described has the same structure, operates in the same manner, and has the same effect. However, the milling tool 1 of the fourth embodiment is different from the first embodiment in that the portion corresponding to the sensor device of the present disclosure including the sensor portion 20, the portion including the first end portion 10A, and the portion including the second end portion 10B can be separated.

[0139] Reference Fig. 22 as well as Fig.23 In the shaft portion 10 of the milling tool 1 of the fourth embodiment, a front end area 10J including a first end 10A as a machining unit and a base end area 10L including a second end 10B can be separated from a middle area 10K of the shaft area including an area surrounded by the sensor portion 20 as a sensor device.

[0140] A recessed portion 19C is formed at the end of the front end region 10J on the second end 10B side. The recessed portion 19C is a region that is recessed toward the first end 10A side in the direction along the rotation axis A. A convex portion 19D is formed as a connecting portion at the end of the middle region 10K on the first end 10A side. The convex portion 19D is a region that protrudes toward the first end 10A side in the direction along the rotation axis A. The recessed portion 19C is a recessed portion having a shape corresponding to the shape of the convex portion 19D. The recessed portion 19C and the convex portion 19D are configured to be able to engage with each other.

[0141] A recessed portion 19E is formed at the end of the middle region 10K on the second end 10B side. The recessed portion 19E is a region that is recessed toward the first end 10A side in the direction along the rotation axis A. A convex portion 19F is formed at the end of the base end region 10L on the first end 10A side. The convex portion 19F is a region that protrudes toward the first end 10A side in the direction along the rotation axis A. The recessed portion 19E is a recessed portion having a shape corresponding to the shape of the convex portion 19F. The recessed portion 19E and the convex portion 19F are configured to be able to engage with each other.

[0142] By engaging the concave portion 19C with the convex portion 19D, the front end region 10J and the middle region 10K are formed as one. In addition, by engaging the concave portion 19E with the convex portion 19F, the middle region 10K and the base end region 10L are formed as one. Thus, the same milling tool 1 as the first embodiment is obtained. By releasing the engagement between the concave portion 19C and the convex portion 19D, the front end region 10J and the middle region 10K can be separated. By releasing the engagement between the concave portion 19E and the convex portion 19F, the middle region 10K and the base end region 10L can be separated.

[0143] In the milling tool of the present invention, the shaft portion may be an integral and inseparable member as in the first embodiment, or the shaft portion may be separable as in the third and fourth embodiments. In addition, the sensor device of the present invention may be a sensor portion that can be separated from the shaft portion as in the first embodiment, or may be integral with a portion of the shaft portion and constitute an integral shaft portion by connecting the portion of the shaft portion to other portions of the shaft portion as in the third and fourth embodiments.

[0144] (Fifth Embodiment)

[0145] Next, a fifth embodiment will be described as an example of the milling tool system of the present disclosure. Fig.24 It is a schematic diagram showing the configuration of a milling tool system according to a fifth embodiment. Fig.24 1 is a diagram showing a state where a milling tool and a receiver included in a milling tool system are set to an operable state. Fig.24 In the diagram, the XY plane corresponds to the horizontal plane, and the Z direction corresponds to the vertical direction.

[0146] Reference Fig.24 The milling tool system 200 of this embodiment includes the milling tool 1 of the first embodiment and a receiver 100. The receiver 100 includes a main body 101 and a linear antenna 102 provided on the main body 101. The 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 the milling tool 1. The linear antenna 102 is, for example, a monopole antenna or a dipole antenna.

[0147] In this embodiment, the milling tool 1 is arranged so that the rotation axis A is along the Z-axis direction which is the vertical direction, taking into account the ease of installation and operation. On the other hand, the receiver 100 is arranged, for example, on the side wall surface of the room in which the milling tool 1 is arranged. At this time, from the viewpoint of avoiding interference with other devices, the linear antenna 102 of the receiver 100 is arranged along the Z-axis direction which is the vertical direction. Here, as in the first embodiment described above, Fig.14 As described above, in the milling tool 1 of the present embodiment, the first direction α 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), and the first direction α 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 as a transmitting antenna is mounted. That is, the first direction α is not parallel to any of the X-axis, the Y-axis, and the Z-axis.

[0148] Thus, when the milling tool 1 transmits the signal S while rotating around the rotation axis A, it is possible to avoid the occurrence of a time when the electric field intensity of the polarized wave in the direction that the linear antenna 102 as the receiving antenna can easily receive in the signal S becomes extremely weak. As a result, the milling tool system 200 of the present embodiment is formed as a milling tool system that can easily receive the signal S containing the information obtained by the strain sensor 31 and the like in the receiver 100 provided outside while suppressing the loss of the information.

[0149] It should be understood that the embodiments disclosed this time are illustrative in all aspects and are not restrictive in any aspect. The scope of the present invention is not defined by the above description but by the claims, and is intended to include all changes within the meaning and scope equivalent to the claims.

[0150] Description of Reference Numerals

[0151] 1: milling tool; 10: shaft; 10A: first end; 10B: second end; 10C: through hole; 10D: first protrusion; 10E: second protrusion; 10F: taper; 10G: groove; 10H: base end region; 10I: front end region; 10J: front end region; 10K: middle region; 10L: base end region; 11: main body; 11A: first small diameter portion; 11B: second small diameter portion; 12: expanded diameter portion; 12A: outer peripheral surface; 12B: outer peripheral surface; 13: recess; 15: second recess; 16: first recess; 16A: bottom surface; 19A: external thread portion; 19B: internal thread portion; 19C: recess; 19D: convex portion; 19E: concave portion; 19F: convex portion; 20: sensor portion; 21: housing; 22: bottom wall portion (cover); 22A: through hole; 23: side wall portion; 24: upper wall portion; 30: sensor component; 31: strain sensor; 32: wiring; 33: connector; 40: substrate module; 49: substrate; 49B: main body; 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: housing body; 61A: through hole; 62: threaded hole; 63: first Fixing member; 63A: inner circumference; 64: threaded hole; 65: second fixing member; 65A: inner circumference; 66: threaded hole; 72: reinforcing plate; 80: sensor module; 91: cutting blade; 92: screw; 99: battery; 100: receiver; 101: main body; 102: linear antenna; 200: milling tool system; 410: first part; 410A: bendable part; 410B: first main surface; 410C: second main surface; 411: first part first area; 412: first part second area; 413: first part third area; 414: first part fourth area; 415: first part fifth area; 416: first Part of the sixth area; 417: the seventh area of ​​the first part; 418: the eighth area of ​​the first part; 419: the ninth area of ​​the first part; 420: the second part; 420A: the bendable part; 420B: the third main surface; 420C: the fourth main surface; 421: the first area of ​​the second part; 422: the second area of ​​the second part; 423: the third area of ​​the second part; 424: the fourth area of ​​the second part; 425: the fifth area of ​​the second part; 426: the sixth area of ​​the second part; 430: the first connecting part; 440: the third part; 440A: the mounting surface; 450: the second connecting part; 460: the fourth part; 470: the third connecting part; A: the rotation axis; L A : vertical line; L B : vertical line; d1: depth; d2: depth; α: first direction; β: plane; γ: connection direction; θ: angle.

Claims

1. A milling tool, comprising: a shaft portion extending from the first end portion to the second end portion along the rotation axis; a sensor portion, disposed on the shaft portion; and a cutting edge arranged around the rotation axis of the shaft portion, in, The sensor unit includes a sensor module, and the sensor module includes: a first sensor for detecting a first physical quantity of the shaft; a base member; and an antenna mounted on the first surface of the base member and transmitting a signal including information of the first physical quantity detected by the first sensor to the outside, The antenna is a patch antenna or a pattern antenna, In a cross section including the rotation axis, a first direction that is a direction perpendicular to the first surface is inclined with respect to a plane perpendicular to the rotation axis and the rotation axis.

2. The milling tool according to claim 1, wherein: An angle formed by a plane perpendicular to the rotation axis and the first direction is greater than or equal to 5° and less than or equal to 85°.

3. The milling tool according to claim 1, wherein: An angle formed by a plane perpendicular to the rotation axis and the first direction is greater than or equal to 15° and less than or equal to 75°.

4. The milling tool according to any one of claims 1 to 3, wherein: An angle formed by a plane perpendicular to the rotation axis and the first direction is greater than or equal to 20° and less than or equal to 70°.

5. The milling tool according to any one of claims 1 to 4, wherein: The base member is a substrate.

6. The milling tool according to any one of claims 1 to 5, wherein: The first sensor is a strain sensor.

7. The milling tool according to claim 6, wherein: The first sensor is configured to detect strain in a direction along the rotation axis.

8. The milling tool according to any one of claims 1 to 7, wherein: The sensor unit further includes a housing for accommodating the sensor module. The housing comprises: a cylindrical side wall portion surrounding the shaft portion and extending in a direction along the rotation axis; A bottom wall portion closing a first opening of the side wall portion in a direction along the rotation axis; as well as an upper wall portion, closing a second opening of the side wall portion located on a side opposite to the first opening in a direction along the rotation axis, At least a portion of at least one of the bottom wall portion and the upper wall portion is made of resin.

9. A milling tool system, wherein: The milling tool system comprises: The milling tool according to any one of claims 1 to 8; and The receiver includes a linear antenna for receiving a signal including information on the first physical quantity transmitted from the antenna.

10. A sensor device, which is a sensor device capable of constituting a sensor portion of a milling tool, the milling tool comprising: a shaft portion extending from a first end portion to a second end portion along a rotation axis; the sensor portion disposed on the shaft portion; and a cutting edge disposed around the rotation axis of the shaft portion, wherein: The sensor device includes a sensor module, the sensor module including: a first sensor for detecting a first physical quantity of the shaft portion; a base member; and an antenna mounted on the first surface of the base member and transmitting a signal including information of the first physical quantity detected by the first sensor to the outside, The antenna is a patch antenna or a pattern antenna, In a cross section including the rotation axis, a first direction that is a direction perpendicular to the first surface is inclined with respect to a plane perpendicular to the rotation axis and the rotation axis.

11. A sensor device, comprising: an axis region extending along a rotation axis; a sensor portion arranged in the axis region; and a connection portion formed at an end of the axis region in a direction along the rotation axis and capable of being connected to a machining unit having a cutting edge, wherein: The sensor unit includes a sensor module, and the sensor module includes: a first sensor for detecting a first physical quantity of the shaft region; a base member; and an antenna mounted on the first surface of the base member, which transmits a signal including information of the first physical quantity detected by the first sensor to the outside, The antenna is a patch antenna or a pattern antenna, In a cross section including the rotation axis, a first direction that is a direction perpendicular to the first surface is inclined with respect to a plane perpendicular to the rotation axis and the rotation axis.

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