Cutting systems and milling tools

Abstract

A cutting processing system according to an embodiment of the present disclosure comprises a power supply device having a power transmission antenna provided in a processing space of a machine tool, and a turning tool arranged in the processing space, the turning tool comprising a rotating shaft rotated and driven by the machine tool, a sensor provided on the rotating shaft, a case provided on the rotating shaft and housing the sensor, and one or more receiving antenna circuits housed in the case and receiving transmitted power from the power transmission antenna.

Description

[Technical Field]

[0001] The present disclosure relates to a cutting system and a milling tool. [Background technology]

[0002] Patent Document 1 discloses a cutting tool including a main body, a sensor disposed in the main body, a wireless communication unit that transmits information indicating the output of the sensor to the outside, and a battery that supplies power to each of the components. The battery is housed in a battery housing, which is a space provided in the main body. This cutting tool can monitor the state of the cutting tool during machining using a sensor and transmit the information to the outside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 230149 Summary of the Invention

[0004] A cutting system according to an embodiment of the present disclosure includes a power supply device having a power transmitting antenna provided in a machining space of a machine tool, and a milling tool arranged in the machining space. The milling tool includes a rotating shaft rotated by the machine tool, a sensor provided on the rotating shaft, a case provided on the rotating shaft and accommodating the sensor, and one or more power receiving antenna circuits housed in the case and receiving power transmitted from the power transmitting antenna. [Brief explanation of the drawings]

[0005] [Figure 1] FIG. 1 is a diagram showing the overall configuration of a cutting system according to an embodiment. [Figure 2] FIG. 2 is an external view of the milling tool according to the first embodiment. [Figure 3] FIG. 3 is a block diagram showing an example of the configuration of a milling tool. [Figure 4] FIG. 4 is a cross-sectional view of a milling tool. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a diagram showing the circuit module when it is laid out on a plane. [Figure 7] FIG. 7 is a radial cross-sectional view of a milling tool according to a modified example of the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view taken along an axial plane of a milling tool according to another modification of the first embodiment. [Figure 9] FIG. 9 is a diagram showing a circuit module included in the milling tool according to the second embodiment. [Figure 10] FIG. 10 is a radial cross-sectional view of a milling tool according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0006] [Problem to be solved by this disclosure] In the conventional cutting tools described above, when the battery power is consumed and depleted, it is necessary to replace it with a new battery. In this case, the old battery must be removed from the battery housing and a new battery must be installed, which makes it difficult to replace the battery during machining. Therefore, if the machining time becomes long and the battery power runs out during machining, there is a risk that it will become impossible to monitor the state of the cutting tool thereafter. The above-mentioned conventional cutting tools are turning tools for performing turning processes, but turning tools for performing milling processes also have the same problems. Furthermore, because the milling tool rotates during machining, it is difficult to connect a charging cable or the like to the milling tool during machining. Therefore, even if the battery built into the tool is a secondary battery that can be charged externally, there is a risk that the battery's power will run out during machining.

[0007] [Effects of this disclosure] According to the present disclosure, the state of the milling tool during machining can be appropriately monitored.

[0008] First, the contents of the embodiment will be listed and explained. [Outline of the embodiment] (1) A cutting system according to an embodiment of the present disclosure includes a power supply device having a power transmitting antenna provided in a machining space of a machine tool, and a milling tool arranged in the machining space. The milling tool includes a rotating shaft rotated by the machine tool, a sensor provided on the rotating shaft, a case provided on the rotating shaft and accommodating the sensor, and one or more power receiving antenna circuits housed in the case and receiving power transmitted from the power transmitting antenna.

[0009] According to the above configuration, the power supply device has a power transmitting antenna within the machining space, and the milling tool has one or more power receiving antenna circuits, enabling wireless power supply to the milling tool within the machining space. This allows power to be supplied to the milling tool during machining, and even if the machining time is long, power can be continuously supplied to the sensor, enabling the sensor to be driven. As a result, the status of the milling tool during machining can be appropriately monitored.

[0010] (2) In the cutting processing system of (1) above, when the case has a cylindrical side wall portion arranged concentrically with the rotating shaft and surrounding the outer periphery of the rotating shaft, and an annular end wall portion closing the end opening of the side wall portion, the one or more receiving antenna circuits may be provided on the inner surface of the end wall portion. In this case, by placing the transmitting antenna at a position axially away from the end of the rotating shaft, the change in the distance between the transmitting antenna and the receiving antenna circuit when the rotating shaft rotates can be prevented from becoming too great, and the transmitted power from the transmitting antenna can be received stably.

[0011] (3) In the cutting system of (2) above, the end wall portion may be made of resin. In this case, it is possible to prevent the end wall portion from interfering with the reception of transmitted power.

[0012] (4) In the cutting processing system of (2) or (3) above, the plurality of power receiving antenna circuits may be provided at equal intervals along a circumferential direction centered on the central axis of the rotating shaft. In this case, when the rotating shaft rotates, each of the multiple power receiving antenna circuits can receive the transmitted power from the power transmitting antenna evenly. As a result, the multiple power receiving antenna circuits can receive the transmitted power stably. Furthermore, by arranging the multiple power receiving antenna circuits at equal intervals along the circumferential direction, it is possible to suppress imbalance in the mass of the entire milling tool.

[0013] (5) In the cutting system of (2) or (3) above, when the one power receiving antenna circuit includes a loop element, the central axis of the rotating shaft may pass through the center of the loop element. In this case, even when the rotating shaft rotates, the change in the relative position of the antenna element with respect to the power transmitting antenna is suppressed, and the power transmitted from the power transmitting antenna can be stably received. Furthermore, since the central axis of the rotating shaft passes through the center of the loop element, the imbalance in the mass of the entire milling tool can be suppressed.

[0014] (6) In any one of the cutting processing systems (2) to (5) above, the cutting processing system may further include a circuit board on which the sensor is mounted and to which the one or more receiving antenna circuits are connected via a line for supplying power to the sensor. In this case, the circuit board can be provided on a portion other than the inner surface of the end wall portion, such as the recovery surface of the rotating shaft, and a large space can be secured on the inner surface for arranging the power receiving antenna circuit.

[0015] (7) The cutting system of (6) above may further include one or more circuit chips mounted on the circuit board. In this case, one or more circuit chips and the sensor can be mounted on the circuit board.

[0016] (8) In the cutting processing system of (7) above, the circuit board may have a first substrate portion on which the sensor is mounted and which is provided on the outer peripheral surface of the rotating shaft, and one or more second substrate portions on which the one or more circuit chips are mounted and which are connected to the first substrate portion by a bendable strip portion, and the one or more second substrate portions may be arranged opposite the end wall portion. In this case, the mounting surface of the second substrate portion on which one or more circuit chips are mounted is aligned with the direction of the centrifugal force generated by the rotation of the rotating shaft, so that the centrifugal force can be prevented from acting in a direction separating the one or more circuit chips from the second substrate portion.

[0017] (9) In the cutting system of (8) above, the one or more circuit chips may include a circuit chip including a communication antenna and a wireless communication circuit that transmits the output of the sensor via the communication antenna. In this case, the communication antenna can be disposed close to the end wall portion, so that when the sensor output is transmitted by the communication antenna, the transmission of the sensor output can be prevented from being hindered by components other than the end wall portion, and the sensor output can be transmitted appropriately.

[0018] (10) In any one of the cutting processing systems (7) to (9) above, the one or more circuit chips may include a circuit chip including a power storage unit that stores the power received by the one or more power receiving antenna circuits. In this case, even when one or more power receiving antenna circuits do not receive transmitted power, the power stored in the power storage unit can be supplied to the sensor.

[0019] (11) In any one of the cutting processing systems (7) to (10) above, the one or more circuit chips may include a circuit chip including a combining circuit that combines the power received by the multiple power receiving antenna circuits. The combining circuit can combine the powers output from the multiple power receiving antenna circuits.

[0020] (12) Another embodiment is a milling tool arranged in a machining space of a machine tool, the milling tool including: a rotating shaft rotated by the machine tool, a sensor provided on the rotating shaft, a case provided on the rotating shaft and accommodating the sensor, and one or more power receiving antenna circuits housed in the case and receiving transmitted power from a power feeding device transmitted by a power transmitting antenna provided in the machining space.

[0021] [Details of the embodiment] Preferred embodiments will now be described with reference to the drawings. At least some of the embodiments described below may be combined in any manner. [Overall structure] 1 is a diagram showing the overall configuration of a cutting system according to an embodiment. In FIG. 1, the cutting system 1 includes a machine tool 2, a milling tool 4, a power supply device 6, and an external device .

[0022] The machine tool 2 is, for example, an NC milling machine. The machine tool 2 has a column 8 and a spindle 10. The column 8 supports the spindle 10 above a table (not shown). The spindle 10 holds the milling tool 4 with a chuck or the like. The spindle 10 is rotated by a motor around a rotation axis that runs in the vertical direction.

[0023] The machine tool 2 rotates the spindle 10 to rotate the milling tool 4. A cutting tip is fixed to the lower end of the milling tool 4. A workpiece fixed to a table is placed at a processing position by moving the table, and is then cut by the milling tool 4. The cutting process is performed in a machining space S of the machine tool 2. The milling tool 4, column 8, spindle 10, table, etc. are arranged in the machining space S. The machining space S is defined by a cover made of metal, resin, or the like. In other words, the machining space S is a space closed by the cover. During cutting, cutting oil (coolant) is supplied. To prevent the cutting oil from scattering, the cutting is performed within the closed machining space S.

[0024] The turning tool 4 is a tool for performing cutting on a workpiece. More specifically, the turning tool 4 is a tool for performing turning, which is a type of cutting. Turning is a process performed by pressing a tool against a fixed workpiece while rotating it.

[0025] The milling tool 4 of this embodiment has a sensor. The sensor has a function of monitoring the state of the milling tool 4. The milling tool 4 also has a function of transmitting output information indicating the output of the sensor to the outside. The configuration of the milling tool 4 will be described in detail later.

[0026] The power supply device 6 has the function of wirelessly supplying power to the milling tool 4 in the machining space S. The power supply device 6 includes a power transmission antenna 6a and a power transmission unit 6b. The power transmission unit 6b generates a power supply signal based on the power supplied from the power source 100 and supplies the signal to the power transmission antenna 6a. The power transmission antenna 6a is fixed at a position in the machining space S where it can wirelessly supply power to the milling tool 4. The power transmission antenna 6a transmits the power supply signal to the milling tool 4 as a power supply radio wave. The power transmitted from the power supply device 6 to the milling tool 4 is used as operating power for the sensor of the milling tool 4 and power for transmitting output information.

[0027] The power supply device 6 of this embodiment generates and transmits a signal in a frequency band that includes 5.7 GHz. That is, the power transmission antenna 6a emits radio waves in a frequency band that includes 5.7 GHz. The frequency band of the radio waves emitted by the power supply device 6 is not particularly limited, but may be a frequency band including 2.4 GHz and 920 MHz from the viewpoint of regulations, etc.

[0028] The external device 7 is a device that is placed outside the machine tool 2 (the machining space S thereof). The external device 7 has a function of performing wireless communication with the milling tool 4. The external device 7 receives output information transmitted by the milling tool 4 via wireless communication. The external device 7 is configured by a computer etc. The external device 7 includes a processing unit, a storage unit, an input / output unit etc.

[0029] The external device 7 further includes a communication unit. The communication unit has a function of performing wireless communication with the milling tool 4. The communication unit performs wireless communication with the milling tool 4, for example, by Bluetooth (registered trademark). Therefore, the communication unit performs wireless communication using a frequency band including 2.4 GHz.

[0030] The external device 7 has a function of receiving output information transmitted from the milling tool 4 via a communication unit and performing processing on the output information. The external device 7 extracts information indicating the monitoring results by the sensor from the output information, stores the information in a memory unit, and outputs the monitoring results to the outside via an input / output unit.

[0031] [Regarding the milling tool according to the first embodiment] FIG. 2 is an external view of the milling tool 4 according to the first embodiment. As shown in FIG. 2, the milling tool 4 includes a rotary shaft 14 and a case 16 . The rotating shaft 14 is a member formed from steel material such as machine structural steel or tool steel. The rotating shaft 14 has a tip-side end 14a and a spindle-side end 14b. A cutting tip is provided at the tip-side end 14a. The spindle-side end 14b is gripped by the spindle 10 of the machine tool 2. The central axis C of the rotating shaft 14 coincides with the rotation axis of the spindle 10. Therefore, the rotating shaft 14 is driven to rotate around the central axis C.

[0032] Case 16 is an annular member that covers a portion of the outer periphery of rotating shaft 14. Inside case 16, sensors, circuits for communicating with external device 7, a rectenna for receiving transmission power from power supply device 6, and the like are housed. The case 16 is fixed to the rotary shaft 14. Therefore, when the rotary shaft 14 is driven to rotate, the case 16 rotates integrally with the rotary shaft 14.

[0033] The main shaft 10 and the column 8 are located above the rotating shaft 14. Therefore, the power transmitting antenna 6a of the power supply device 6 is disposed diagonally above the rotating shaft 14, as shown in Fig. 2, while avoiding the main shaft 10 and the column 8. In other words, the power transmitting antenna 6a is disposed at a position spaced apart in the axial and radial directions from the main shaft side end 14b of the rotating shaft 14.

[0034] FIG. 3 is a block diagram showing an example of the configuration of the milling tool 4. As shown in FIG. As shown in FIG. 3, in addition to the rotating shaft 14 and case 16 described above, the milling tool 4 further includes a plurality of sensors 20 (four in the illustrated example), a wireless communication circuit 22, a charge control circuit 24, a power storage unit 26, a synthesis circuit 28, and a plurality of rectennas 30 (four in the illustrated example). The four sensors 20 , the wireless communication circuit 22 , the charge control circuit 24 , the power storage unit 26 , the combining circuit 28 , and the four rectennas 30 are housed inside the case 16 .

[0035] The four rectennas 30 receive the power transmitted from the power transmitting antenna 6a of the power feeding device 6. Each of the four rectennas 30 has a power receiving antenna 30a and a rectifier circuit 30b. The power receiving antenna 30a receives radio waves for power supply from the power supply device 6. The power receiving antenna 30a provides an electrical signal based on the received radio waves to the rectifier circuit 30b. The rectifier circuit 30b rectifies the electrical signal provided by the power receiving antenna 30a, converts it into DC power, and outputs it. That is, the rectenna 30 constitutes a power receiving antenna circuit having a power receiving antenna 30a that receives the power transmitted from the power transmitting antenna 6a. The DC power output from the rectifier circuit 30b is provided to the combiner circuit . The combining circuit combines the DC powers output by the four rectennas 30. The combined DC power is provided to the charge control circuit .

[0036] The charging control circuit 24 has the functions of converting the DC power provided from the combining circuit 28 (rectenna 30) to a predetermined voltage, controlling the charging and discharging of the storage unit 26, and providing the DC power from the combining circuit 28 and the DC power from the storage unit 26 to the four sensors 20 and the wireless communication circuit 22. Furthermore, when DC power is provided from combining circuit 28, charge control circuit 24 can provide DC power only to power storage unit 26. Furthermore, when DC power is not provided from the combining circuit 28, the charge control circuit 24 can provide the DC power stored in the power storage unit 26 to the four sensors 20 and the wireless communication circuit 22.

[0037] The power storage unit 26 includes, for example, a battery or a capacitor. The power storage unit 26 stores DC power provided via the charge control circuit 24. The power storage unit 26 also discharges the stored power based on the control of the charge control circuit 24.

[0038] The four sensors 20 are sensors for monitoring the state of the rotating shaft 14. More specifically, the four sensors 20 include a strain sensor, a temperature sensor, an acceleration sensor, etc. The four sensors 20 have the function of monitoring the strain, temperature, and acceleration (vibration), which are states of the rotating shaft 14. When DC power is supplied from the charge control circuit 24, the four sensors 20 provide an output indicating the results of monitoring the state of the rotating shaft 14 to the wireless communication circuit 22.

[0039] The wireless communication circuit 22 is provided with a communication antenna 23. The wireless communication circuit 22 has a function of performing wireless communication with the external device 7 via the communication antenna 23. The wireless communication circuit 22 wirelessly transmits the outputs provided from the four sensors 20 as output information. When DC power is provided from the charge control circuit 24, the wireless communication circuit 22 establishes a communication connection with the external device 7 and starts wireless transmission of the output information.

[0040] When performing cutting using the cutting system 1, first, an operator of the system 1 attaches the milling tool 4 to the spindle 10. Next, the operator attaches a workpiece to the table of the machine tool 2. Thereafter, the operator closes the cover of the machine tool 2 to close the machining space S. Next, the operator starts wireless power supply to the milling tool 4 by the power supply device 6 . As a result, the milling tool 4 receives power transmitted from the power supply device 6. When power is supplied from the power supply device 6, the four sensors 20 of the milling tool 4 start monitoring the state of the rotating shaft 14 and outputting the monitoring results. Furthermore, the wireless communication circuit 22 establishes a communication connection with the external device 7 and starts wirelessly transmitting output information. Thereafter, the operator operates the machine tool 2 to start cutting.

[0041] At this time, the four sensors 20 of the milling tool 4 provide outputs indicating the results of monitoring the state of the milling tool 4 to the wireless communication circuit 22. The wireless communication circuit 22 wirelessly transmits the outputs provided by the four sensors 20 as output information. The output information transmitted by the wireless communication circuit 22 is received by the external device 7. The external device 7 receives the output information and acquires information indicating the state of the rotating shaft 14 from the output information. The external device 7 outputs the acquired information indicating the state of the rotating shaft 14. This allows the external device 7 to output the machining state (state of the milling tool 4) during cutting to an operator. The operator can monitor the machining state during cutting via the output of the external device 7.

[0042] In FIG. 3, the four sensors 20, the wireless communication circuit 22, the charge control circuit 24, the power storage unit 26, and the synthesis circuit 28 are mounted on a circuit board 36. The circuit board 36, and the four sensors 20 and the circuits 22, 24, 26, and 28 mounted on the circuit board 36 constitute a circuit module 40. The four rectennas 30 are connected to the circuit module 40.

[0043] The circuit module 40 further has four connectors 38. Four lines 39 extending from the four rectennas 30 are connected to the four connectors 38. In other words, the four rectennas 30 are connected to the circuit module 40 (circuit board 36) via the four lines 39. The power output from the four rectennas 30 is supplied to the combining circuit 28 of the circuit module 40 via four lines 39 and four connectors 38 . The circuit module 40 (circuit board 36) is provided on the outer circumferential surface of the rotating shaft 14. The four rectennas 30 are provided on the inner surface of the case 16 .

[0044] Fig. 4 is a cross-sectional view of the milling tool 4. Fig. 4 shows a cross section along an axial plane including the central axis C. Fig. 4 shows cross sections of the case 16 and the rectenna 30, and external views of the rotating shaft 14 and the circuit module 40. 4, the case 16 is exaggerated to make it easier to understand the inside of the case 16. The same applies to the following description.

[0045] In FIG. 4, the rotating shaft 14 has a large diameter portion 44, a first small diameter portion 46a, and a second small diameter portion 46b. The small diameter portions 46a, 46b extend axially from both end surfaces of the large diameter portion 44. The tip of the first small diameter portion 46a is the tip-side end portion 14a. The tip of the second small diameter portion 46b is the spindle-side end portion 14b. Therefore, a cutting tip is provided at the tip of the first small diameter portion 46a. Furthermore, the tip of the second small diameter portion 46b is gripped by the spindle 10 of the machine tool 2.

[0046] The case 16 has a case body 48 and a first end wall portion 50 . The case body 48 is an annular member formed using a steel plate, etc. The case body 48 has a side wall portion 52 and a second end wall portion 54. The side wall portion 52 has a cylindrical shape that surrounds the outer periphery of the large diameter portion 44. The side wall portion 52 is disposed concentrically with the rotary shaft 14. In other words, the axial center of the side wall portion 52 coincides with the central axis C.

[0047] The second end wall portion 54 is a flat, annular member. The outer peripheral end of the second end wall portion 54 is connected to the end portion 52a. The end portion 52a is the end portion of the side wall portion 52 on the second small diameter portion 46b side. The second small diameter portion 46b is inserted into the center hole 54a of the second end wall portion 54. The inner surface 54b of the second end wall portion 54 abuts against the annular end face 44b. The annular end face 44b is the end face of the large diameter portion 44 on the second small diameter portion 46b side, and is a surface connecting the outer peripheral surface 44a of the large diameter portion 44 and the outer peripheral surface 46b1 of the second small diameter portion 46b. The case body 48 is positioned relative to the rotary shaft 14 by the second small diameter portion 46b and the annular end face 44b.

[0048] The first end wall portion 50 is a flat, annular member made of resin. The first small diameter portion 46a is inserted into a central hole 50a of the first end wall portion 50. An outer peripheral end 50b of the first end wall portion 50 abuts against the side wall portion 52. Thus, the first end wall portion 50 closes an opening 52c in an end portion 52b of the side wall portion 52. The end portion 52b is the end portion of the side wall portion 52 on the side of the first small diameter portion 46a. In other words, the first end wall portion 50 is a lid that closes the opening of the case body 48.

[0049] Additionally, the inner surface 50c of the first end wall portion 50 abuts against the annular end face 44c. The annular end face 44c is the end face of the large diameter portion 44 on the first small diameter portion 46a side, and is a surface connecting the outer circumferential surface 44a of the large diameter portion 44 and the outer circumferential surface 46a1 of the first small diameter portion 46a. The first end wall portion 50 is positioned with respect to the rotary shaft 14 by the first small diameter portion 46a and the annular end face 44c.

[0050] The case body 48 is fixed integrally to the rotary shaft 14 by screws or the like (not shown). Furthermore, the first end wall portion 50 is fixed integrally to the rotary shaft 14 and the case body 48 by screws or the like (not shown). In this way, the case 16 is fixed integrally to the rotary shaft 14.

[0051] The gap between the center hole 54a of the second end wall portion 54 and the second small diameter portion 46b is sealed. Also, the gap between the center hole 50a of the first end wall portion 50 and the first small diameter portion 46a is sealed. Furthermore, the gap between the outer peripheral edge 50b of the first end wall portion 50 and the side wall portion 52 is sealed. This prevents cutting oil from entering the inside of the case 16.

[0052] The circuit module 40 is provided on the outer peripheral surface 44a of the large diameter portion 44. The circuit board 36 included in the circuit module 40 is a rectangular band-shaped FPC (Flexible Printed Circuits). Therefore, the circuit module 40 is deformable. The circuit module 40 is wound around the outer peripheral surface 44a in a deformed state. The four rectennas 30 are provided on the inner surface 50c of the first end wall portion 50.

[0053] Fig. 5 is a cross-sectional view taken along line VV in Fig. 4. Fig. 5 shows a radial cross-section of the milling tool 4 along a plane perpendicular to the central axis C. 4 and 5, each of the four rectennas 30 has an antenna substrate 58. The antenna substrate 58 has a rectangular plate shape. A power receiving antenna 30a included in the rectenna 30 is mounted on a first surface 58a of the antenna substrate 58. A second surface 58b of the antenna substrate 58 abuts against the inner surface 50c. The first surface 58a is the surface of the antenna substrate 58 facing the second small diameter portion 46b. The second surface 58b is the surface of the antenna substrate 58 facing the first small diameter portion 46a.

[0054] The four antenna substrates 58 are fixed to the inner surface 50c. As shown in Fig. 5, the four antenna substrates 58 are arranged at equal intervals (90 degree intervals) in the circumferential direction so as to surround the rotating shaft 14. The longitudinal directions of the multiple antenna substrates 58 are perpendicular to a radial line passing through the central axis C. In this way, the multiple rectennas 30 (multiple antenna substrates 58) are provided at equal intervals along the circumferential direction around the central axis C.

[0055] As shown in FIG. 5, on a first surface 58a of the antenna substrate 58, a circuit chip 60 is mounted in addition to the power receiving antenna 30a. The power receiving antenna 30a includes a pair of antenna elements 30a1 and a pair of lines 30a2. The pair of antenna elements 30a1 and the pair of lines 30a2 are made of metal foil such as copper foil patterned on the first surface 58a. The pair of antenna elements 30a1 have a linear shape that extends along the longitudinal direction of the antenna substrate 58. The pair of antenna elements 30a1 are arranged in a row along the longitudinal direction of the antenna substrate 58. The power receiving antenna 30a that has the pair of antenna elements 30a1 forms a dipole antenna.

[0056] The pair of lines 30a2 connect the ends of the pair of antenna elements 30a1 to the circuit chip 60. The circuit chip 60 is a circuit chip that includes the rectifier circuit 30b. The line 39 is connected to the circuit chip 60. As described above, the line 39 is a line that is connected to the connector 38 of the circuit module 40.

[0057] FIG. 6 is a diagram showing the circuit module 40 stretched out on a plane. The circuit module 40 (circuit board 36) has a rectangular strip shape. The circuit module 40 has a first end 40a and a second end 40b. The longitudinal length of the circuit module 40 is slightly shorter than the outer circumference of the large diameter portion 44. Therefore, when the circuit module 40 is wrapped around the large diameter portion 44, a slight gap is provided between the first end 40a and the second end 40b (see FIGS. 4 and 5).

[0058] As described above, the four sensors 20 and the four connectors 38 are mounted on the circuit board 36 of the circuit module 40. Furthermore, a first circuit chip 62, a second circuit chip 64, and a third circuit chip 66 are mounted on the circuit board .

[0059] The four connectors 38 and the circuit chips 62, 64, and 66 are mounted on an outer surface 36a of the circuit board 36. The four sensors 20 are mounted on an inner surface 36b of the circuit board 36. The outer surface 36a is the surface that faces outward when the circuit module 40 is wrapped around the large diameter portion 44. The inner surface 36b is the surface opposite the outer surface 36a and is the surface that faces inward when the circuit module 40 is wrapped around the large diameter portion 44.

[0060] The four sensors 20 are arranged side by side along the longitudinal direction of the circuit module 40. The four sensors 20 are arranged so as to be equally spaced along the circumferential direction when the circuit module 40 is wound around the large diameter portion 44.

[0061] The four connectors 38 are provided along the longitudinal direction of the circuit module 40 in correspondence with the positions of the four sensors 20. Therefore, the four connectors 38 are also provided so as to be disposed at equal intervals along the circumferential direction when the circuit module 40 is wound around the large diameter portion 44. The four connectors 38 are provided closer to the first long side 36c than the four sensors 20. The first long side 36c is the long side of the circuit board 36 located on the first small diameter portion 46a side.

[0062] The circuit chips 62 , 64 , and 66 are arranged side by side along the longitudinal direction of the circuit module 40 . The circuit chips 62, 64, and 66 are provided closer to the second long side 36d than the four sensors 20. The second long side 36d is the long side of the circuit board 36 located on the second small diameter portion 46b side.

[0063] The first circuit chip 62 has a chip body 62a and a communication antenna 23. The communication antenna 23 is provided on an outer surface 62a1 of the chip body 62a. The chip body 62a is a circuit chip including a wireless communication circuit 22. The position of the first circuit chip 62 in the longitudinal direction of the circuit module 40 corresponds to the position of the sensor 20 that is closest to the first end 40a among the four sensors 20.

[0064] The second circuit chip 64 is a circuit chip that includes the charge control circuit 24 and the power storage unit 26. The position of the second circuit chip 64 in the longitudinal direction of the circuit module 40 is the midpoint between the pair of sensors 20 that are arranged in the middle of the four sensors 20 .

[0065] The third circuit chip 66 is a circuit chip that includes the composite circuit 28 . The position of the third circuit chip 66 in the longitudinal direction of the circuit module 40 is midway between the sensor 20 closest to the second end 40b of the four sensors 20 and the sensor 20 adjacent to this sensor 20.

[0066] When the circuit module 40 is wound around the large diameter portion 44, the four sensors 20 come into contact with the outer circumferential surface 44a of the large diameter portion 44. This allows the four sensors 20 to monitor the state of the rotating shaft 14. When the four sensors 20 come into contact with the outer peripheral surface 44a, a gap may be formed between the outer peripheral surface 44a and the inner surface 36b of the circuit board 36. This gap is filled with a resin or the like. As a result, the circuit module 40 is tightly fixed to the outer peripheral surface 44a. The sensor 20 may be mounted on the circuit board 36 by being connected to the circuit board 36 by a lead wire or the like.

[0067] According to the above configuration, the power supply device 6 has a power transmitting antenna 6a within the machining space S, and the milling tool 4 has multiple rectennas 30 (power receiving antenna circuits), making it possible to wirelessly supply power to the milling tool 4 within the machining space S. Therefore, power can be supplied to the milling tool 4 during machining, and even if the machining time is long, power can be continuously supplied to the sensor 20, making it possible to monitor using the sensor 20. As a result, the state of the milling tool 4 during machining can be appropriately monitored.

[0068] Furthermore, in this embodiment, multiple rectennas 30 are provided on the inner surface 50c of the first end wall portion 50 of the case 16, and the power transmitting antenna 6a is positioned axially away from the main shaft side end portion 14b of the rotating shaft 14. This prevents the distance between the power transmitting antenna 6a and the rectenna 30 from changing significantly when the rotating shaft 14 rotates, and allows stable reception of power transmitted from the power transmitting antenna 6a.

[0069] In addition, in this embodiment, since the first end wall portion 50 is formed from resin, the transmitted power from the power transmitting antenna 6a can easily pass through the first end wall portion 50, and it is possible to prevent the first end wall portion 50 from interfering with the reception of the transmitted power.

[0070] Furthermore, in this embodiment, the four rectennas 30 are disposed at equal intervals along the circumferential direction around the central axis C of the rotating shaft 14, so that when the rotating shaft 14 rotates, each of the multiple rectennas 30 can receive the transmitted power from the power transmitting antenna 6a evenly. As a result, the multiple rectennas 30 can stably receive the transmitted power. Furthermore, by providing four rectennas 30 at equal intervals along the circumferential direction, imbalance in the mass of the entire milling tool 4 can be suppressed.

[0071] Furthermore, in this embodiment, a circuit board 36 is provided on which four sensors 20 are mounted and to which four rectennas 30 are connected via four lines 39 for supplying power to the four sensors 20, so that the circuit board 36 (circuit module 40) can be provided in a portion other than the inner surface 50c of the first end wall portion 50, such as the outer peripheral surface of the rotating shaft. This makes it possible to ensure a large space on the inner surface 50c for arranging the rectenna 30.

[0072] [Regarding Modifications of the First Embodiment] FIG. 7 is a radial cross-sectional view of a milling tool 4 according to a modified example of the first embodiment. The milling tool 4 of this modified example has one rectenna 30, and differs from the above embodiment in that the antenna element 30a1 of this rectenna 30 is a loop element.

[0073] The antenna substrate 58 of the rectenna 30 of this embodiment is a flat, annular plate. The antenna substrate 58 is fixed to the inner surface 50c so that the center of the antenna substrate 58 and the central axis C coincide with each other. The antenna element 30a1 of the power receiving antenna 30a mounted on the first surface 58a of the antenna substrate 58 has a C-shaped loop shape. Therefore, the power receiving antenna 30a of this embodiment constitutes a loop antenna. A pair of lines 30a2 connect both ends of the antenna element 30a1 to the circuit chip 60. The circuit chip 60 is connected to the connector 38 of the circuit module 40 via lines 39.

[0074] The antenna element 30a1, which is a loop element, is provided on the first surface 58a so that the central axis C passes through the center P of the antenna element 30a1. Therefore, even when the rotary shaft 14 rotates, the change in the relative position of the antenna element 30a1 with respect to the power transmitting antenna 6a is suppressed, and the power transmitted from the power transmitting antenna 6a can be received stably. Furthermore, by having the central axis C pass through the center P of the antenna element 30a1, imbalance in the mass of the entire milling tool 4 can be suppressed.

[0075] FIG. 8 is a cross-sectional view taken along an axial plane of a milling tool 4 according to another modification of the first embodiment. This modified example differs from the above embodiment in that the first end wall portion 50 of the case 16 is fitted and fixed to the outside of the second small diameter portion 46b on the spindle 10 side, and the first end wall portion 50 is provided on the spindle 10 side relative to the circuit module 40 and the large diameter portion 44.

[0076] In this modified example, multiple rectennas 30 are provided on the inner surface of the end wall portion of the case 16, and the transmitting antenna 6a is positioned axially away from the main shaft side end 14b of the rotating shaft 14. This prevents the distance between the transmitting antenna 6a and the rectenna 30 from changing significantly when the rotating shaft 14 rotates, and allows stable reception of the transmitted power from the transmitting antenna 6a.

[0077] Furthermore, in this embodiment, the first end wall portion 50 is provided on the main shaft 10 side relative to the circuit module 40 and the large diameter portion 44, and the power transmitting antenna 6a is disposed at a position axially spaced apart from the main shaft-side end portion 14b of the rotating shaft 14, thereby reducing obstacles, such as the case body 48, that are disposed between the power transmitting antenna 6a and the multiple rectennas 30. As a result, the transmitted power from the power transmitting antenna 6a can be received more stably.

[0078] [Regarding the milling tool according to the second embodiment] FIG. 9 is a diagram showing a circuit module 40 included in the milling tool 4 according to the second embodiment. This embodiment differs from the first embodiment in that the circuit board 36 of the circuit module 40 has a first board portion 70 and a plurality of second board portions 72 (three in the illustrated example).

[0079] The first substrate portion 70 has a rectangular strip shape. The first substrate portion 70 is deformed and wrapped around the outer peripheral surface 44a of the large diameter portion 44 of the rotating shaft 14. Four connectors 38 are mounted on the outer surface 70a of the first substrate portion 70. Four sensors 20 are mounted on the inner surface 70b of the first substrate portion 70. The outer surface 70a is the surface that faces outward when the first substrate portion 70 is wrapped around the large diameter portion 44. The inner surface 70b is the surface that faces inward when the first substrate portion 70 is wrapped around the large diameter portion 44. The four connectors 38 and the four sensors 20 are arranged side by side along the longitudinal direction of the circuit module 40, similar to the first embodiment.

[0080] 9, the three second substrate portions 72 are connected to the long side 70c. The long side 70c is the long side of the first substrate portion 70 located on the first small diameter portion 46a side. Each of the three second substrate portions 72 has a rectangular shape. The second substrate portions 72 are connected to the long sides 70c via bendable strip portions 74. The positions of the three second substrate portions 72 in the longitudinal direction of the circuit module 40 are intermediate positions between pairs of adjacent connectors 38 among the four connectors 38. Of the three second substrate portions 72, the second substrate portion 72 on the first end portion 40a side has the first circuit chip 62 mounted thereon. Of the three second substrate portions 72, the second substrate portion 72 on the second end portion 40b side has a third circuit chip 66 mounted thereon. Of the three second substrate portions 72, the second circuit chip 64 is mounted on the central second substrate portion 72.

[0081] FIG. 10 is a radial cross-sectional view of a milling tool 4 according to the second embodiment. 10, the first substrate portion 70 of the circuit board 36 is wrapped around the outer peripheral surface 44a of the large diameter portion 44. The first substrate portion 70 is fixed to the outer peripheral surface 44a in the same manner as in the first embodiment.

[0082] The mounting surface 72a of each of the three second substrate portions 72 faces the second small diameter portion 46b. The mounting surface 72a is the surface of the second substrate portion 72 on which a circuit chip is mounted. The surface opposite the mounting surface 72a abuts against the inner surface 50c and is fixed to the inner surface 50c. As a result, the three second substrate portions 72 are disposed opposite the inner surface 50c of the first end wall portion 50, respectively. Similarly to the four rectennas 30, the three second substrate portions 72 are provided at equal intervals along the circumferential direction. This makes it possible to prevent the three second base plate portions 72 from disturbing the dynamic balance of the entire milling tool 4, and to prevent imbalance in the mass of the entire milling tool 4.

[0083] In this case, since the mounting surface 72a is aligned with the direction of the centrifugal force generated by the rotation of the rotating shaft 14, the centrifugal force can be prevented from acting in a direction separating the circuit chips 62, 64, 66 from the second substrate portion 72.

[0084] Furthermore, in this embodiment, the first circuit chip 62 including the wireless communication circuit 22 (chip body 62a) that transmits the output of the sensor 20 via the communication antenna 23 is mounted on the second substrate portion 72, so that the communication antenna 23 can be disposed close to the first end wall portion 50. Therefore, when the output of the sensor 20 is transmitted via the communication antenna 23, it is possible to prevent components other than the first end wall portion 50 from interfering with the transmission of the output of the sensor 20, and the output of the sensor 20 can be transmitted appropriately.

[0085] 〔others〕 It should be noted that the embodiments disclosed herein are to be considered as illustrative in all respects and not restrictive. In each of the above embodiments, the rectenna 30 is provided on the inner surface 50c of the first end wall portion 50, but the rectenna 30 may be provided on the inner surface of the side wall portion 52 or the inner surface of the second end wall portion 54 as long as it is housed within the case 16. Furthermore, in the above embodiment, the case 16 has an annular shape, but the outer shape of the case 16 may have a regular polygonal shape, such as a hexagon or an octagon. In addition, in the above-described embodiments, the power receiving antenna 30a is configured as a dipole antenna or a loop antenna, but the power receiving antenna 30a may be configured as a patch antenna having one or more patch elements.

[0086] The scope of the present invention is defined by the claims, not by the meaning described above, and is intended to include meanings equivalent to the claims and all modifications within the scope thereof. [Explanation of symbols]

[0087] 1. Cutting processing system 2 Machine tools 4 Turning tools 6 Power supply equipment 6a Power transmission antenna 6b Power transmission section 7 External device 8. Column 10 spindle 14 Rotating shaft 14a Chip side end 14b Spindle side end 16 cases 20 sensors 22 Wireless communication circuit 23 Communication Antenna 24 Charging control circuit 26 Power storage unit 28 Synthesis circuit 30 Rectenna 30a receiving antenna 30a1 Antenna element 30a2 track 30b rectifier circuit 36 Circuit Board 36a Exterior 36b Inside 36c First long side 36d Second long side 38 Connectors 39 Railroad 40 Circuit Module 40a 1st end 40b 2nd end 44 Large diameter section 44a Outer surface 44b Annular end face 44c Annular end face 46a Small diameter section 46a1 Outer surface 46b Small diameter section 46b1 Outer surface 48 Case body 50 first end wall 50a center hole 50b Outer edge 50c inner surface 52 Side wall 52a end 52b End 52c aperture 54 Second end wall 54a center hole 54b Inside 58 Antenna board 58a 1st page 58b 2nd side 60 Circuit Chips 62 First Circuit Chip 62a Chip body 62a1 External surface 64 Second Circuit Chip 66 Third Circuit Chip 70 First board section 70a Exterior 70b Inner surface 70cm long side 72 Second board section 72a Mounting surface 74 Belt 100 power supply C center axis P center S machining space

Claims

1. a power supply device provided in a machining space of the machine tool and having a power transmission antenna for emitting radio waves for power supply; A milling tool disposed in the machining space, The cutting tool is A rotating shaft that is rotated by the machine tool; and A sensor provided on the rotating shaft; a case provided on the rotating shaft and housing the sensor; one or more power receiving antenna circuits that are housed in the case and receive the power supply radio waves; The case is a cylindrical side wall portion that is arranged concentrically with the rotating shaft and surrounds an outer circumferential side of the rotating shaft; an annular end wall portion that closes an end opening of the side wall portion, The one or more power receiving antenna circuits are provided on the inner surface of the end wall portion. Cutting processing system.

2. The end wall portion is formed of resin. The cutting system according to claim 1 .

3. The plurality of power receiving antenna circuits are provided at equal intervals along a circumferential direction around a central axis of the rotating shaft. The cutting system according to claim 1 or 2.

4. the first power receiving antenna circuit includes a loop element, The central axis of the rotating shaft passes through the center of the loop element. The cutting system according to claim 1 or 2.

5. The power receiving device further includes a circuit board on which the sensor is mounted and to which the one or more power receiving antenna circuits are connected via a line for supplying power to the sensor. The cutting system according to claim 1 or 2.

6. and one or more circuit chips mounted on the circuit board. The cutting system according to claim 5 .

7. The circuit board includes: a belt-shaped first substrate portion on which the sensor is mounted and which is wound around an outer circumferential surface of the rotating shaft; one or more foldable strips extending from a long side of the first substrate portion; one or more second substrate portions provided at the tip of the one or more strip portions, The one or more second substrate portions are disposed opposite the end wall portion. The cutting system according to claim 6 .

8. The one or more circuit chips include a circuit chip including a communication antenna and a wireless communication circuit for transmitting an output of the sensor by the communication antenna. The cutting system according to claim 7.

9. The one or more circuit chips include a circuit chip including a power storage unit that stores the power received by the one or more power receiving antenna circuits. The cutting system according to claim 6 .

10. The one or more circuit chips include a circuit chip including a combining circuit that combines the power received by the multiple power receiving antenna circuits. The cutting system according to claim 6 .

11. A milling tool arranged in a machining space of a machine tool, A rotating shaft that is rotated by the machine tool; and A sensor provided on the rotating shaft; a case provided on the rotating shaft and housing the sensor; one or more power receiving antenna circuits that are housed in the case and receive radio waves for power supply radiated from a power transmitting antenna provided in the machining space, The case is a cylindrical side wall portion that is arranged concentrically with the rotating shaft and surrounds an outer circumferential side of the rotating shaft; an annular end wall portion that closes an end opening of the side wall portion, The one or more power receiving antenna circuits are provided on the inner surface of the end wall portion. Turning tools.

Images