Cutting system and milling tool

Abstract

A cutting system according to an embodiment of the present disclosure is provided with: a power supply device having a power transmission antenna provided in a machining space of a machine tool; and a milling tool disposed in the machining space, the milling tool including: a rotating shaft that is driven to rotate by the machine tool; the sensor is arranged on the rotating shaft; the shell is arranged on the rotating shaft and accommodates the sensor; and one or more power receiving antenna circuits housed in the housing and receiving power transmitted from the power transmitting antenna.

Description

Technical Field

[0001] This disclosure relates to a cutting system and a milling tool. Background Technology

[0002] Patent Document 1 discloses a cutting tool comprising a main body, a sensor unit disposed on the main body, a wireless communication unit for transmitting information indicating the output of the sensor to the outside, and a battery for supplying power to each part. The battery is built into a space provided in the main body, namely a battery housing.

[0003] This cutting tool can monitor its status during the machining process via sensors and transmit the data externally.

[0004] Existing technical documents Patent documents Patent document 1: International Publication No. 2022 / 230149. Summary of the Invention

[0005] The cutting system disclosed herein includes: a power supply device having a power transmission antenna disposed in the machining space of a machine tool; and a milling tool disposed in the machining space. The milling tool includes: a rotary axis driven to rotate by the machine tool; a sensor disposed on the rotary axis; a housing disposed on the rotary axis to house the sensor; and one or more power receiving antenna circuits housed in the housing to receive power transmitted from the power transmission antenna. Attached Figure Description

[0006] Figure 1 This is a diagram showing the overall configuration of the cutting system involved in the implementation method.

[0007] Figure 2 This is an external view of the milling tool according to the first embodiment.

[0008] Figure 3 This is a block diagram illustrating an example of the structure of a milling tool.

[0009] Figure 4 It is a cross-sectional view of a milling tool.

[0010] Figure 5 yes Figure 4 The VV-line sectional view in the middle.

[0011] Figure 6 This is a diagram showing how the circuit module is extended on a plane.

[0012] Figure 7 This is a radial cross-sectional view of the milling tool involved in a variation of the first embodiment.

[0013] Figure 8 It is a cross-sectional view of a plane along the axial direction of the milling tool involved in other variations of the first embodiment.

[0014] Figure 9 This is a diagram showing the circuit modules of the milling tool according to the second embodiment.

[0015] Figure 10 This is a radial cross-sectional view of the milling tool according to the second embodiment. Detailed Implementation

[0016] [The problem this disclosure aims to solve] In the existing cutting tools described above, when the battery power is depleted, it needs to be replaced with a new one. In this case, the old battery must be removed from the battery holder and a new battery installed, making it difficult to replace the battery during the machining process.

[0017] Therefore, due to the long processing time, there is a risk that the status of the cutting tool will no longer be able to be monitored when the battery runs out of power during the processing.

[0018] Although the aforementioned existing cutting tools are turning tools used for turning operations, the same problem exists in milling tools used for milling operations.

[0019] Furthermore, since the milling tool rotates during machining, it is difficult to connect charging cables or similar devices to the tool during the machining process. Therefore, even if the battery built into the tool is used as a rechargeable battery and the configuration is designed to be charged externally, there is still a risk that the battery may run out of power during machining.

[0020] [The Effects of This Disclosure] According to this disclosure, it is possible to appropriately monitor the status of milling tools during the machining process.

[0021] First, the implementation methods are listed and explained.

[0022] [Summary of Implementation Methods] (1) The cutting system according to the embodiments of this disclosure includes: a power supply device having a power transmission antenna disposed in the machining space of a machine tool; and a milling tool disposed in the machining space. The milling tool includes: a rotary axis driven to rotate by the machine tool; a sensor disposed on the rotary axis; a housing disposed on the rotary axis to house the sensor; and one or more power receiving antenna circuits disposed in the housing to receive power transmission from the power transmission antenna.

[0023] Based on the above configuration, the power supply device has a power transmission antenna within the machining space, and the milling tool has one or more power receiving antenna circuits, thus enabling wireless power supply to the milling tool within the machining space. Therefore, it is possible to power the milling tool during the machining process, continuously supplying power to the sensor even during long machining sessions, and driving the sensor. As a result, the status of the milling tool during the machining process can be appropriately monitored.

[0024] (2) Alternatively, in the cutting system described in (1) above, if the housing has a cylindrical sidewall portion that is concentrically arranged with the rotating shaft and surrounds the outer periphery of the rotating shaft, and an annular endwall portion that blocks the end opening of the sidewall portion, the one or more powered antenna circuits are disposed on the inner surface of the endwall portion.

[0025] In this case, if the power transmission antenna is positioned at the end that is axially away from the axis of rotation, the large change in the distance between the power transmission antenna and the receiving antenna circuit during the rotation of the axis of rotation can be suppressed, and the power transmitted from the power transmission antenna can be received stably.

[0026] (3) In the cutting system described in (2) above, the end wall portion may be formed of resin.

[0027] In this case, it is possible to suppress situations where the end wall portion hinders the reception of transmitted power.

[0028] (4) Alternatively, in the cutting system described in (2) or (3) above, the plurality of powered antenna circuits are arranged at equal intervals along the circumferential direction centered on the central axis of the rotating shaft.

[0029] In this configuration, as the rotating shaft rotates, multiple receiving antenna circuits can receive the transmitted power from the transmitting antennas equally and independently. As a result, the multiple receiving antenna circuits can stably receive the transmitted power. Furthermore, by arranging multiple receiving antenna circuits at equal intervals along the circumference, the overall mass imbalance of the milling tool can be suppressed.

[0030] (5) In the cutting system of (2) or (3) above, if the powered antenna circuit includes a loop element, the central axis of the rotating shaft passes through the center of the loop element.

[0031] In this case, even with the rotation of the rotating shaft, changes in the relative position of the antenna element with respect to the transmission antenna are suppressed, enabling stable reception of power from the transmission antenna. Furthermore, by having the central axis of the rotating shaft pass through the center of the loop element, overall mass imbalance of the milling tool can be suppressed.

[0032] (6) Alternatively, in any of the cutting systems described in (2) to (5) above, there is also a circuit board on which the sensor is mounted and connected to the one or more powered antenna circuits via a line for supplying power to the sensor.

[0033] In this case, for example, the circuit board can be placed outside the inner surface of the end wall portion such as the recovery surface of the rotation shaft, which can ensure a larger arrangement space for the charged antenna circuit in the inner surface.

[0034] (7) In the cutting system described in (6) above, one or more circuit chips may also be mounted on the circuit board.

[0035] In this case, one or more circuit chips and sensors can be mounted on the circuit board.

[0036] (8) Alternatively, in the cutting system described in (7) above, the circuit board has: a first substrate portion on which the sensor is mounted and disposed 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 connected to the first substrate portion via a bendable strip portion, wherein the one or more second substrate portions are disposed opposite to the end wall portion.

[0037] In this case, the mounting surface of the second substrate portion on which one or more circuit chips are mounted is along the direction of the centripetal force generated by the rotation of the rotation axis, thus suppressing the centripetal force from acting in the direction that separates one or more circuit chips from the second substrate portion.

[0038] (9) In the cutting system of (8) above, the one or more circuit chips may include the following circuit chips: including a communication antenna and a wireless communication circuit that transmits the output of the sensor through the communication antenna.

[0039] In this case, the communication antenna can be positioned close to the end wall. Therefore, when transmitting the sensor output through the communication antenna, it is possible to prevent components other than the end wall from obstructing the transmission of the sensor output, and the sensor output can be transmitted appropriately.

[0040] (10) In any of the cutting processes in (7) to (9) above, the one or more circuit chips may include the following circuit chips: a power storage unit that stores the power received by the one or more powered antenna circuits.

[0041] In this case, even if one or more receiving antenna circuits do not receive transmitted power, the power stored in the energy storage section can still be provided to the sensor.

[0042] (11) In any of the cutting processes in (7) to (10) above, the one or more circuit chips may include the following circuit chips: a synthesis circuit that combines the power received by the multiple powered antenna circuits.

[0043] By using a combining circuit, it is possible to combine the power output from multiple powered antenna circuits.

[0044] (12) Another embodiment from another perspective is a milling tool disposed in the machining space of a machine tool. The milling tool includes: a rotary axis that is driven to rotate by the machine tool; a sensor disposed on the rotary axis; a housing disposed on the rotary axis to house the sensor; and one or more powered antenna circuits disposed in the housing to receive power from a power supply device powered by a power transmission antenna disposed in the machining space.

[0045] [Details of the implementation method] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings.

[0046] In addition, at least a portion of the embodiments described below can be combined in any way.

[0047] [Regarding the overall composition] Figure 1 This is a diagram showing the overall configuration of the cutting system involved in the implementation method. Figure 1 In the process, the cutting system 1 includes a machine tool 2, a milling tool 4, a power supply device 6, and an external device 7.

[0048] Machine tool 2 is, for example, an NC milling machine. Machine tool 2 has a column 8 and a spindle 10. The column 8 supports the spindle 10 above the worktable (not shown). The spindle 10 holds the milling tool 4 by means of a chuck or the like. The spindle 10 is rotated about a rotation axis in the vertical direction by a motor.

[0049] Machine tool 2 drives milling tool 4 to rotate by rotating spindle 10. A cutting insert is fixed to the lower end of milling tool 4. The workpiece fixed to the worktable is positioned for machining by moving the worktable, and is then machined by milling tool 4.

[0050] The cutting process is performed within the machining space S of the machine tool 2. The milling tool 4, column 8, spindle 10, worktable, etc. are arranged within the machining space S.

[0051] The machining space S is divided by a cover made of metal, resin, or the like. That is, the machining space S is a space enclosed by the cover. During cutting, cutting oil (coolant) is supplied. To prevent the cutting oil from scattering, the cutting process is carried out within the enclosed machining space S.

[0052] Milling tool 4 is a tool used for cutting a workpiece. More specifically, milling tool 4 is a tool used for milling operations in cutting processes. Milling operations refer to machining processes performed by rotating and pressing a tool relative to a fixed workpiece.

[0053] The milling tool 4 in this embodiment includes a sensor. The sensor has the function of monitoring the state of the milling tool 4. The milling tool 4 also has the function of sending output information representing the output of the sensor to the outside. The configuration of the milling tool 4 will be described in detail below.

[0054] The power supply device 6 provides power to the milling tool 4 within the machining space S via wireless power supply. The power supply device 6 includes a power transmission antenna 6a and a power transmission section 6b. The power transmission section 6b generates a power supply signal based on the power supplied from the power source 100 and provides this signal to the power transmission antenna 6a. The power transmission antenna 6a is fixed at a position capable of wirelessly supplying power to the milling tool 4 within the machining space S. The power transmission antenna 6a transmits the power supply signal as a power supply radio wave to the milling tool 4.

[0055] The power supplied from the power supply unit 6 to the milling tool 4 is used as the power for the sensors of the milling tool 4 to transmit operating power and output information.

[0056] The power supply device 6 of this embodiment generates and transmits a signal containing a frequency band of 5.7 GHz. That is, it radiates radio waves containing a frequency band of 5.7 GHz from the power transmission antenna 6a.

[0057] Furthermore, the frequency band of the radio waves emitted by the power supply device 6 is not particularly limited, but from the point of view of rules, it can also be a frequency band including 2.4 GHz and 920 MHz.

[0058] External device 7 is a device disposed outside the machining space S of machine tool 2. External device 7 has the function of wireless communication with milling tool 4. External device 7 receives output information sent by milling tool 4 via wireless communication.

[0059] External device 7 is composed of a computer or the like. External device 7 includes a processing unit, a storage unit, and an input / output unit.

[0060] The external device 7 also includes a communication unit. This communication unit has the function of wirelessly communicating with the milling tool 4. The communication unit communicates wirelessly with the milling tool 4, for example, via Bluetooth (Bluetooth: registered trademark). Therefore, the communication unit uses a frequency band including 2.4 GHz for wireless communication.

[0061] External device 7 has the function of receiving output information sent from milling tool 4 via communication unit and performing processing related to the output information. External device 7 extracts information representing sensor-based monitoring results from the output information and stores it in storage unit or outputs the monitoring results to the outside via input / output unit.

[0062] [Regarding the milling tool involved in the first embodiment] Figure 2 This is an external view of the milling tool 4 according to the first embodiment.

[0063] like Figure 2 As shown, the milling tool 4 has a rotating shaft 14 and a housing 16.

[0064] The rotating shaft 14 is a component made of steel materials such as mechanical structure steel and tooling steel.

[0065] The rotary shaft 14 has a cutting tool side end 14a and a spindle side end 14b. A cutting tool is provided at the cutting tool side end 14a. The spindle side end 14b is held by the spindle 10 of the machine tool 2. The central axis C of the rotary shaft 14 is aligned with the rotation axis of the spindle 10. Therefore, the rotary shaft 14 is driven to rotate around the central axis C.

[0066] The housing 16 is an annular component. The housing 16 covers a portion of the outer periphery of the rotating shaft 14. Inside the housing 16 are sensors, circuitry for communicating with external devices 7, a rectifier antenna for receiving transmitted power from the power supply device 6, and the like.

[0067] The housing 16 is fixed to the rotating shaft 14. Therefore, when the rotating shaft 14 is driven to rotate, the housing 16 rotates integrally with the rotating shaft 14.

[0068] The main shaft 10 and the column 8 are located above the rotation axis 14. Therefore, the power transmission antenna 6a of the power supply device 6 avoids the main shaft 10 and the column 8, and as... Figure 2 The antenna 6a is positioned diagonally above the rotation axis 14. That is, the transmission antenna 6a is positioned axially and radially away from the main shaft side end 14b of the rotation axis 14.

[0069] Figure 3 This is a block diagram showing an example of the configuration of milling tool 4.

[0070] like Figure 3 As shown, in addition to the aforementioned rotary axis 14 and housing 16, the milling tool 4 also includes multiple (four in the illustration) sensors 20, a wireless communication circuit 22, a charging control circuit 24, a battery storage unit 26, a synthesis circuit 28, and multiple (four in the illustration) rectifier antennas 30.

[0071] Four sensors 20, wireless communication circuit 22, charging control circuit 24, energy storage unit 26, synthesis circuit 28, and four rectifier antennas 30 are housed inside the housing 16.

[0072] Four rectifier antennas 30 receive power transmitted from the power transmission antenna 6a of the power supply unit 6.

[0073] The four rectifier antennas 30 each have a receiving antenna 30a and a rectifier circuit 30b. The receiving antenna 30a receives electromagnetic waves for power supply from the power supply device 6. The receiving antenna 30a provides an electrical signal based on the received electromagnetic waves to the rectifier circuit 30b. The rectifier circuit 30b rectifies the electrical signal provided from the receiving antenna 30a, converting it into direct current power for output.

[0074] That is, the rectifier antenna 30 constitutes a receiving antenna circuit, which has a receiving antenna 30a that receives the transmitted power from the transmitting antenna 6a.

[0075] The DC power output from the rectifier circuit 30b is supplied to the combining circuit 28.

[0076] The combining circuit 28 combines the DC power output from the four rectifier antennas 30 and provides the combined DC power to the charging control circuit 24.

[0077] The charging control circuit 24 has the following functions: converting the DC power supplied from the combining circuit 28 (rectifier antenna 30) into a predetermined voltage, or controlling the charging and discharging of the energy storage unit 26, or providing DC power from the combining circuit 28 and DC power from the energy storage unit 26 to the four sensors 20 and the wireless communication circuit 22.

[0078] In addition, when DC power is supplied from the synthesis circuit 28, the charging control circuit 24 can supply DC power only to the energy storage unit 26.

[0079] Furthermore, when no DC power is supplied from the synthesis circuit 28, the charging control circuit 24 is able to supply the DC power stored in the energy storage unit 26 to the four sensors 20 and the wireless communication circuit 22.

[0080] The energy storage unit 26 includes, for example, a battery and a capacitor. The energy storage unit 26 stores the DC power supplied via the charging control circuit 24. Furthermore, the energy storage unit 26 discharges the stored power under the control of the charging control circuit 24.

[0081] Four sensors 20 are used to monitor 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 state of the rotating shaft 14, namely strain, temperature, and acceleration (vibration). When DC power is supplied from the charging control circuit 24, the four sensors 20 provide an output to the wireless communication circuit 22, representing the results of monitoring the state of the rotating shaft 14.

[0082] A communication antenna 23 is provided in the wireless communication circuit 22. The wireless communication circuit 22 has the function of wireless communication with the external device 7 through the communication antenna 23.

[0083] The wireless communication circuit 22 wirelessly transmits the outputs from the four sensors 20 as output information. When DC power is supplied from the charging control circuit 24, the wireless communication circuit 22 establishes a communication connection with the external device 7 and begins wirelessly transmitting output information.

[0084] When performing cutting using the aforementioned cutting system 1, firstly, the operator of system 1 mounts the milling tool 4 onto the spindle 10. Next, the operator mounts the workpiece onto the worktable of the machine tool 2. Afterward, the operator closes the machining space S by closing the cover of the machine tool 2.

[0085] Next, the operator initiates wireless power supply to the milling tool 4 based on the power supply device 6.

[0086] Thus, the milling tool 4 receives power from the power supply unit 6. Powered by the power supply unit 6, the four sensors 20 of the milling tool 4 begin 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 begins wirelessly transmitting information.

[0087] Then, the operator moves machine tool 2 to initiate the cutting process.

[0088] At this time, the four sensors 20 of the milling tool 4 provide outputs to the wireless communication circuit 22, representing the results of monitoring the state of the milling tool 4. The wireless communication circuit 22 wirelessly transmits the outputs provided by the four sensors 20 as output information.

[0089] The output information transmitted by the wireless communication circuit 22 is received by the external device 7.

[0090] The external device 7, upon receiving the output information, acquires information representing the state of the rotary axis 14 from the output information. The external device 7 outputs the acquired information representing the state of the rotary axis 14. Thus, the external device 7 can output the machining state (state of the milling tool 4) during cutting to the operator. The operator can monitor the machining state during cutting through the output of the external device 7.

[0091] Figure 3 In the circuit board 36, four sensors 20, wireless communication circuit 22, charging control circuit 24, energy storage unit 26, and synthesis circuit 28 are mounted.

[0092] The circuit board 36, the four sensors 20 mounted on the circuit board 36, and the circuits 22, 24, 26, and 28 constitute the circuit module 40. The four rectifier antennas 30 are connected to the circuit module 40.

[0093] The circuit module 40 also has four connectors 38. Four lines 39 extending from the four rectifier antennas 30 are connected to the four connectors 38. That is, the four rectifier antennas 30 are connected to the circuit module 40 (circuit board 36) via the four lines 39.

[0094] The power output of the four rectifier antennas 30 is supplied to the synthesis circuit 28 of the circuit module 40 via four lines 39 and four connectors 38.

[0095] The circuit module 40 (circuit board 36) is disposed on the outer peripheral surface of the rotation shaft 14.

[0096] Four rectifier antennas 30 are disposed on the inner surface of the housing 16.

[0097] Figure 4 This is a cross-sectional view of milling tool 4. Figure 4 In the diagram, represents a cross-section along a plane containing the central axis C. Figure 4 In the diagram, a cross-section is shown with respect to the housing 16 and the rectifier antenna 30, and an appearance is shown with respect to the rotating shaft 14 and the circuit module 40.

[0098] In addition, Figure 4 In the illustration, the interior of housing 16 is depicted in an exaggerated manner for ease of understanding. The same applies to the following description.

[0099] Figure 4In this design, the rotary 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 and 46b extend axially from both end faces of the large-diameter portion 44. The front end of the first small-diameter portion 46a is a cutting tool side end 14a. The front end of the second small-diameter portion 46b is a spindle side end 14b. Therefore, a cutting tool is provided at the front end of the first small-diameter portion 46a. Furthermore, the front end of the second small-diameter portion 46b is held by the spindle 10 of the machine tool 2.

[0100] The housing 16 has a housing body 48 and a first end wall portion 50.

[0101] The housing body 48 is a ring-shaped component formed using steel plates or the like. The housing body 48 has a side wall portion 52 and a second end wall portion 54.

[0102] The sidewall portion 52 has a cylindrical shape that surrounds the outer periphery of the large-diameter portion 44. The sidewall portion 52 is concentrically arranged with the rotation axis 14. That is, the axial center of the sidewall portion 52 coincides with the central axis C.

[0103] 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 on the side of the second small diameter portion 46b in the side wall portion 52. The second small diameter portion 46b is inserted into the central hole 54a of the second end wall portion 54. Furthermore, 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 on the side of the second small diameter portion 46b in the large diameter portion 44, and is the surface that connects the outer peripheral surface 44a of the large diameter portion 44 with the outer peripheral surface 46b1 of the second small diameter portion 46b. The housing body 48 is positioned on the rotation shaft 14 via the second small diameter portion 46b and the annular end face 44b.

[0104] The first end wall portion 50 is a flat, annular component formed using resin. A first small-diameter portion 46a is inserted into the central hole 50a of the first end wall portion 50. Furthermore, the outer peripheral end 50b of the first end wall portion 50 abuts against the side wall portion 52. Therefore, the first end wall portion 50 blocks the opening 52c of the 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.

[0105] That is, the first end wall portion 50 is a cover that seals the opening of the housing body 48.

[0106] Furthermore, 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 on the side of the first minor diameter portion 46a in the large diameter portion 44, and is the surface that connects the outer peripheral surface 44a of the large diameter portion 44 with the outer peripheral surface 46a1 of the first minor diameter portion 46a. The first end wall portion 50 is positioned on the rotation shaft 14 by the first minor diameter portion 46a and the annular end face 44c.

[0107] The housing body 48 is integrally fixed to the rotating shaft 14 by screws or the like (not shown). Additionally, the first end wall portion 50 is integrally fixed to both the rotating shaft 14 and the housing body 48 by screws or the like (not shown). Thus, the housing 16 is integrally fixed to the rotating shaft 14.

[0108] The center hole 54a of the second end wall portion 54 is sealed to the second minor diameter portion 46b. Additionally, the center hole 50a of the first end wall portion 50 is sealed to the first minor diameter portion 46a. Furthermore, the outer peripheral end 50b of the first end wall portion 50 is sealed to the side wall portion 52. This prevents cutting oil from entering the interior of the housing 16.

[0109] The circuit module 40 is disposed on the outer peripheral surface 44a of the large-diameter portion 44. The circuit substrate 36 included in the circuit module 40 is a rectangular strip-shaped FPC (Flexible Printed Circuit). Therefore, the circuit module 40 can be deformed. The circuit module 40 is wound in a deformed state along the outer peripheral surface 44a. Four rectifier antennas 30 are disposed on the inner surface 50c of the first end wall portion 50.

[0110] Figure 5 yes Figure 4 The VV-line sectional view in the middle. Figure 5 This represents the radial section of the milling tool 4 along a plane orthogonal to the central axis C.

[0111] like Figure 4 as well as Figure 5 As shown, the four rectifier antennas 30 each have an antenna substrate 58.

[0112] The antenna substrate 58 is a rectangular plate.

[0113] The receiving antenna 30a, which is included in the rectifier antenna 30, is mounted on the first surface 58a of the antenna substrate 58. The second surface 58b of the antenna substrate 58 abuts against the inner surface 50c. The first surface 58a is the surface on the side of the second small diameter portion 46b in the antenna substrate 58. The second surface 58b is the surface on the side of the first small diameter portion 46a in the antenna substrate 58.

[0114] Four antenna substrates 58 are fixed to the inner surface 50c. For example... Figure 5 As shown, four antenna substrates 58 are arranged circumferentially at equal intervals (90-degree intervals) around the rotation axis 14. In addition, the longitudinal direction of the plurality of antenna substrates 58 is orthogonal to a radial line passing through the central axis C.

[0115] In this way, multiple rectified antennas 30 (multiple antenna substrates 58) are arranged at equal intervals along the circumference centered on the central axis C.

[0116] like Figure 5As shown, in addition to the receiving antenna 30a, a circuit chip 60 is also installed on the first surface 58a of the antenna substrate 58.

[0117] The 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 metal foils such as copper foil with patterns formed on the first surface 58a.

[0118] A pair of antenna elements 30a1 are linear along the length of the antenna substrate 58. The pair of antenna elements 30a1 are arranged in a row along the length of the antenna substrate 58. The receiving antenna 30a with a pair of antenna elements 30a1 constitutes a dipole antenna.

[0119] A pair of lines 30a2 connects the ends of a pair of antenna elements 30a1 to the circuit chip 60.

[0120] Circuit chip 60 is a circuit chip that includes rectifier circuit 30b. Additionally, circuit chip 60 is connected to line 39. As described above, line 39 is a line connected to connector 38 of circuit module 40.

[0121] Figure 6 This is a diagram showing the circuit module 40 extended on a plane.

[0122] The circuit module 40 (circuit substrate 36) is a rectangular strip. The circuit module 40 has a first end 40a and a second end 40b. The length of the circuit module 40 in the longitudinal direction is slightly shorter than the outer periphery of the large-diameter portion 44. Therefore, when the circuit module 40 is wound around the large-diameter portion 44, a slight gap is provided between the first end 40a and the second end 40b (see reference). Figure 4 as well as Figure 5 ).

[0123] As described above, four sensors 20 and four connectors 38 are mounted on the circuit board 36 of the circuit module 40.

[0124] Furthermore, a first circuit chip 62, a second circuit chip 64, and a third circuit chip 66 are mounted on the circuit board 36.

[0125] Four connectors 38, and circuit chips 62, 64, and 66 are mounted on the outer surface 36a of the circuit board 36. Four sensors 20 are mounted on the inner surface 36b of the circuit board 36. The outer surface 36a is the outward-facing surface when the circuit module 40 is wound around the large-diameter portion 44. The inner surface 36b is the opposite surface of the outer surface 36a, and is the inward-facing surface when the circuit module 40 is wound around the large-diameter portion 44.

[0126] Four sensors 20 are arranged side by side along the length of the circuit module 40. The four sensors 20 are configured to be equally spaced along the circumference when the circuit module 40 is wound around the large diameter portion 44.

[0127] The four connectors 38 are positioned corresponding to the four sensors 20 and are arranged along the length of the circuit module 40. Therefore, the four connectors 38 are also arranged at equal intervals along the circumference when the circuit module 40 is wound around the large-diameter portion 44.

[0128] The four connectors 38 are positioned closer to the first long side 36c than the four sensors 20.

[0129] The first long side 36c is the long side of the circuit board 36 located on the side of the first small diameter portion 46a.

[0130] Circuit chips 62, 64, and 66 are arranged side by side along the length of circuit module 40.

[0131] Circuit chips 62, 64, and 66 are positioned 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 side of the second small diameter portion 46b.

[0132] The first circuit chip 62 has a chip body 62a and a communication antenna 23. The communication antenna 23 is disposed on the outer surface 62a1 of the chip body 62a. The chip body 62a is a circuit chip containing a wireless communication circuit 22.

[0133] The position of the first circuit chip 62 in the length direction of the circuit module 40 corresponds to the position of the sensor 20 closest to the first end 40a among the four sensors 20.

[0134] The second circuit chip 64 is a circuit chip that includes a charging control circuit 24 and an energy storage unit 26.

[0135] The second circuit chip 64 in the length direction of the circuit module 40 is located at the middle position of the pair of sensors 20 arranged in the center among the four sensors 20.

[0136] The third circuit chip 66 is a circuit chip that includes the synthesis circuit 28.

[0137] The position of the third circuit chip 66 in the length direction of the circuit module 40 is the middle position of the sensor 20 closest to the second end 40b among the four sensors 20, and the sensor 20 adjacent to that sensor 20.

[0138] When the circuit module 40 is wound around the large-diameter portion 44, the four sensors 20 abut against the outer peripheral surface 44a of the large-diameter portion 44. Thus, the four sensors 20 are able to monitor the state of the rotating shaft 14.

[0139] Four sensors 20 contact the outer peripheral surface 44a, thereby creating a gap between the outer peripheral surface 44a and the inner surface 36b of the circuit board 36. This gap is filled with resin or the like. Thus, the circuit module 40 is tightly fixed to the outer peripheral surface 44a.

[0140] In addition, the sensor 20 can also be connected to the circuit board 36 via leads or the like and thus mounted on the circuit board 36.

[0141] Based on the above configuration, the power supply device 6 has a power transmission antenna 6a within the machining space S, and the milling tool 4 has multiple rectifier antennas 30 (power receiving antenna circuits), thus enabling wireless power supply to the milling tool 4 within the machining space S. Therefore, power can be supplied to the milling tool 4 during machining, and power can be continuously supplied to the sensor 20 even during long machining periods, enabling monitoring based on the sensor 20. As a result, the status of the milling tool 4 during machining can be appropriately monitored.

[0142] In addition, in this embodiment, a plurality of rectifier antennas 30 are disposed on the inner surface 50c of the first end wall portion 50 of the housing 16, and the power transmission antenna 6a is disposed at a position away from the main shaft side end 14b of the rotation shaft 14 in the axial direction. This can suppress the situation where the distance between the power transmission antenna 6a and the rectifier antenna 30 changes greatly when the rotation shaft 14 rotates, and can stably receive the power transmission from the power transmission antenna 6a.

[0143] In addition, in this embodiment, the first end wall portion 50 is formed of resin, so the power transmitted from the power transmission antenna 6a can easily pass through the first end wall portion 50, and the situation where the power transmission reception is hindered by the first end wall portion 50 can be suppressed.

[0144] Furthermore, in this embodiment, the four rectifier antennas 30 are arranged at equal intervals along the circumferential direction centered on the central axis C of the rotation axis 14. Therefore, when the rotation axis 14 rotates, the multiple rectifier antennas 30 can receive the transmitted power from the transmission antenna 6a in a balanced manner. As a result, the multiple rectifier antennas 30 can receive the transmitted power stably.

[0145] In addition, by arranging four rectifier antennas 30 at equal intervals along the circumference, the overall mass imbalance of the milling tool 4 can be suppressed.

[0146] In addition, in this embodiment, a circuit board 36 is provided, which is equipped with four sensors 20 and connected to four rectifier antennas 30 via four lines 39 for supplying power to the four sensors 20. Therefore, 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.

[0147] This ensures a larger space for the rectifier antenna 30 in the inner surface 50c.

[0148] [Regarding variations of the first embodiment] Figure 7 This is a radial cross-sectional view of the milling tool 4 involved in a variation of the first embodiment.

[0149] The milling tool 4 in this variation has a rectifier antenna 30, whose antenna element 30a1 is a loop element, which differs from the above embodiment.

[0150] In this embodiment, the antenna substrate 58 of the rectifier antenna 30 is a flat ring. The antenna substrate 58 is fixed to the inner surface 50c with its center aligned with the central axis C.

[0151] The antenna element 30a1 of the receiving antenna 30a mounted on the first surface 58a of the antenna substrate 58 has a C-shaped loop. Therefore, the receiving antenna 30a of this embodiment constitutes a loop antenna.

[0152] A pair of lines 30a2 connects the two 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 line 39.

[0153] The loop element, namely the antenna element 30a1, is arranged on the first surface 58a with the central axis C passing through the center P of the antenna element 30a1.

[0154] Therefore, even when the rotating shaft 14 rotates, the change in the relative position of the antenna element 30a1 with respect to the power transmission antenna 6a is suppressed, and the power transmission from the power transmission antenna 6a can be received stably.

[0155] In addition, the central axis C passes through the center P of the antenna element 30a1, thereby suppressing the overall mass imbalance of the milling tool 4.

[0156] Figure 8 It is a cross-sectional view of the plane along the axial direction of the milling tool 4 involved in other variations of the first embodiment.

[0157] In this modified example, the first end wall portion 50 of the housing 16 is externally fixed to the second small diameter portion 46b on the side of the main shaft 10. The first end wall portion 50 is disposed on the side of the main shaft 10 relative to the circuit module 40 and the large diameter portion 44, which is different from the above embodiment.

[0158] In this modified example, multiple rectifier antennas 30 are also provided on the inner surface of the end wall of the housing 16, and the power transmission antenna 6a is positioned at the main shaft side end 14b away from the rotation shaft 14 in the axial direction. Therefore, it is possible to suppress the situation where the distance between the power transmission antenna 6a and the rectifier antenna 30 changes greatly when the rotation shaft 14 rotates, and to stably receive the power transmission from the power transmission antenna 6a.

[0159] Furthermore, in this embodiment, the first end wall portion 50 is disposed on the main shaft 10 side relative to the circuit module 40 and the large-diameter portion 44, and the power transmission antenna 6a is disposed at the main shaft side end 14b axially away from the rotation axis 14. Therefore, obstacles such as the housing body 48 disposed between the power transmission antenna 6a and the plurality of rectifier antennas 30 can be reduced. As a result, the power transmitted from the power transmission antenna 6a can be received more stably.

[0160] [Regarding the milling tool involved in the second embodiment] Figure 9 This is a diagram showing the circuit module 40 of the milling tool 4 according to the second embodiment.

[0161] In this embodiment, the circuit board 36 of the circuit module 40 has a first board portion 70 and a plurality of (three in the illustration) second board portions 72, which differs from the first embodiment.

[0162] The first substrate portion 70 is rectangular and strip-shaped. The first substrate portion 70 is wound while deformed along the outer peripheral surface 44a of the large-diameter portion 44 of the rotation axis 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 outward-facing surface of the first substrate portion 70 when wound around the large-diameter portion 44. The inner surface 70b is the inward-facing surface of the first substrate portion 70 when wound around the large-diameter portion 44.

[0163] The four connectors 38 and the four sensors 20 are arranged side by side along the length of the circuit module 40, just as in the first embodiment.

[0164] like Figure 9 As shown, 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 side of the first small diameter portion 46a.

[0165] Each of the three second substrate portions 72 has a rectangular shape. The second substrate portion 72 is connected to the long side 70c via a bendable strip portion 74.

[0166] The positions of the three second substrate portions 72 along the length of the circuit module 40 are the middle positions of a pair of adjacent connectors 38 among the four connectors 38.

[0167] A first circuit chip 62 is mounted on the second substrate portion 72 on the side of the first end 40a of the three second substrate portions 72.

[0168] A third circuit chip 66 is mounted on the second substrate portion 72 on the second end 40b side of the three second substrate portions 72.

[0169] A second circuit chip 64 is mounted on the central second substrate 72 among the three second substrate sections 72.

[0170] Figure 10 This is a radial cross-sectional view of the milling tool 4 according to the second embodiment.

[0171] like Figure 10 As shown, the first substrate portion 70 of the circuit board 36 is wound 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.

[0172] Each of the three second substrate portions 72 has a mounting surface 72a facing the side of the second minor diameter portion 46b.

[0173] Mounting surface 72a refers to the surface in the second substrate portion 72 where a circuit chip is mounted.

[0174] In addition, the opposite side of the mounting surface 72a abuts against the inner surface 50c and is fixed to the inner surface 50c.

[0175] Thus, the three second substrate portions 72 are respectively arranged opposite to the inner surface 50c of the first end wall portion 50.

[0176] In addition, the three second substrate portions 72 and the four rectifier antennas 30 are arranged at equal intervals along the circumference.

[0177] Therefore, it is possible to suppress the situation where the three second substrate portions 72 disturb the overall dynamic balance of the milling tool 4, and to suppress the overall mass imbalance of the milling tool 4.

[0178] In this case, the mounting surface 72a is along the direction of the centripetal force generated by the rotation of the rotation axis 14, so it is possible to suppress the centripetal force from acting in the direction that separates the circuit chip 62, circuit chip 64, circuit chip 66 from the second substrate portion 72.

[0179] Furthermore, in this embodiment, the first circuit chip 62 is mounted on the second substrate portion 72. This first circuit chip 62 includes a wireless communication circuit 22 (chip body 62a) that transmits the output of the sensor 20 via the communication antenna 23. Therefore, the communication antenna 23 can be positioned close to the first end wall portion 50. Thus, when transmitting the output of the sensor 20 via the communication antenna 23, it is possible to prevent any obstruction to the transmission of the sensor 20's output by structures other than the first end wall portion 50, and the transmission of the sensor 20's output can be performed appropriately.

[0180] 〔other〕 Furthermore, the embodiments disclosed herein should be considered illustrative rather than restrictive in all respects.

[0181] In the above embodiments, the case in which the rectifier antenna 30 is disposed on the inner surface 50c of the first end wall portion 50 is illustrated. However, the rectifier antenna 30 may be housed in the housing 16, or disposed on the inner surface of the side wall portion 52 or the inner surface of the second end wall portion 54.

[0182] In addition, in the above embodiment, the case where the housing 16 has a circular shape is illustrated, but the shape of the housing 16 may also be a regular polygon such as a hexagon or an octagon.

[0183] Furthermore, in the above embodiments, examples were shown of the receiving antenna 30a being configured as a dipole antenna and as a loop antenna. However, the receiving antenna 30a may also be configured as a patch antenna having one or more patch elements.

[0184] The scope of this invention is not defined by the foregoing meaning, but by the claims, and is intended to include all modifications within the scope and meaning equivalent to the claims.

[0185] Explanation of reference numerals in the attached figures 1: Cutting and machining system; 2: Machine tools; 4: Milling tools; 6: Power supply device; 6a: Power transmission antenna; 6b: Ministry of Electric Power Transmission; 7: External devices; 8: Columns; 10: Spindle; 14: Rotation axis; 14a: Blade side end; 14b: Spindle-side end; 16: Shell; 20: Sensors; 22: Wireless communication circuit; 23: Communication antenna; 24: Charging control circuit; 26: Battery Storage Unit; 28: Synthetic circuit; 30: Rectifier antenna; 30a: Receiving antenna; 30a1: Antenna element; 30a2: Line; 30b: Rectifier circuit; 36: Circuit board; 36a: Outer surface; 36b: Inner surface; 36c: The first longest side; 36d: the second longest side; 38: Connector; 39: Line; 40: Circuit module; 40a: First end; 40b: Second end; 44: Large diameter part; 44a: Outer peripheral surface; 44b: Annular end face; 44c: Annular end face; 46a: Small diameter portion; 46a1: Outer peripheral surface; 46b: Small diameter portion; 46b1: Outer peripheral surface; 48: Main body of the shell; 50: First end wall portion; 50a: Center hole; 50b: Peripheral end; 50c: Inner surface; 52: Side wall portion; 52a: End; 52b: End; 52c: Open; 54: Second end wall portion; 54a: Center hole; 54b: Inner surface; 58: Antenna substrate; 58a: First page; 58b: Second page; 60: Circuit chip; 62: First circuit chip; 62a: Chip body; 62a1: Outer surface; 64: Second circuit chip; 66: Third circuit chip; 70: First substrate section; 70a: Outer surface; 70b: Inner surface; 70c: Long side; 72: Second substrate section 72a: Mounting surface; 74: Band-like portion; 100: Power supply; C: Central axis; P: Center; S: Processing space.

Claims

1. A cutting process system, wherein, The cutting system includes: The power supply unit includes a power transmission antenna installed in the machining space of the machine tool; and Milling tools are configured in the machining space. The milling tool includes: The rotating axis is driven to rotate by the machine tool; The sensor is mounted on the rotating axis; A housing, disposed on the rotation axis, accommodates the sensor; and One or more receiving antenna circuits are housed in the housing and receive power from the transmitting antenna.

2. The cutting system according to claim 1, wherein, The housing has: A cylindrical sidewall portion, concentrically arranged with the rotation axis, surrounds the outer periphery of the rotation axis; and The annular end wall portion seals the end opening of the side wall portion. The one or more powered antenna circuits are disposed on the inner surface of the end wall portion.

3. The cutting system according to claim 2, wherein, The end wall portion is formed of resin.

4. The cutting system according to claim 2 or 3, wherein, The plurality of powered antenna circuits are arranged at equal intervals along the circumference centered on the central axis of the rotation axis.

5. The cutting system according to claim 2 or 3, wherein, One of the powered antenna circuits includes a loop element. The central axis of the rotating shaft passes through the center of the loop element.

6. The cutting system according to any one of claims 2 to 5, wherein, The cutting system also includes a circuit board on which the sensor is mounted and connected to one or more powered antenna circuits via lines for supplying power to the sensor.

7. The cutting system according to claim 6, wherein, The cutting system also includes one or more circuit chips mounted on the circuit board.

8. The cutting system according to claim 7, wherein, The circuit board has: A first substrate portion, on which the sensor is mounted, is disposed 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, are connected to the first substrate portion via a bendable strip portion. The one or more second substrate portions are arranged opposite to the end wall portions.

9. The cutting system according to claim 8, wherein, The one or more circuit chips include the following circuit chips: a communication antenna and a wireless communication circuit that transmits the output of the sensor through the communication antenna.

10. The cutting system according to any one of claims 7 to 9, wherein, The one or more circuit chips include the following circuit chips: a power storage unit that stores the power received by the one or more powered antenna circuits.

11. The cutting system according to any one of claims 7 to 10, wherein, The one or more circuit chips include the following circuit chips: a combining circuit that combines the power received by the multiple powered antenna circuits.

12. A milling tool disposed in the machining space of a machine tool, wherein, The milling tool includes: The rotating axis is driven to rotate by the machine tool; The sensor is mounted on the rotating axis; A housing, disposed on the rotation axis, accommodates the sensor; and One or more powered antenna circuits are housed in the housing and receive power from a power supply device that transmits power through a power transmission antenna disposed in the processing space.

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