Cutting systems and cutting tools

Abstract

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 cutting tool arranged in the machining space and having a power receiving antenna circuit that receives transmitted power from the power transmitting antenna. The cutting tool includes a first tool body provided with a first sensor, and a housing separate from the first tool body, connected to the first tool body via a first power line for supplying power to the first sensor, and housing the power receiving antenna circuit therein.

Description

[Technical field]

[0001] The present disclosure relates to cutting systems and cutting tools. [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 is capable of monitoring the state of the cutting tool during machining using a sensor and transmitting the state 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 cutting tool arranged in the machining space and having a power receiving antenna circuit that receives transmitted power from the power transmitting antenna. The cutting tool includes a first tool body provided with a first sensor, and a housing separate from the first tool body, connected to the first tool body via a first power line for supplying power to the first sensor, and housing the power receiving antenna circuit therein. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is a diagram showing an overall configuration of a cutting system according to an embodiment. [Diagram 2] FIG. 2 is a front view of an end face of a turret to which a cutting tool according to the first embodiment is attached. [Diagram 3]FIG. 3 is a block diagram showing an example of the configuration of a cutting tool. [Figure 4] FIG. 4 is a cross-sectional view of the housing. [Diagram 5] FIG. 5 is a diagram showing the board surface of the circuit board in FIG. [Figure 6] FIG. 6 is a block diagram of a cutting tool according to a modified example. [Figure 7] FIG. 7 is a front view of an end face of a turret to which a plurality of cutting tools are attached. [Figure 8] FIG. 8 is a front view of an end face of a turret to which a cutting tool according to the second embodiment is attached. [Figure 9] FIG. 9 shows a cross-sectional view taken along line IV-IV in FIG. [Figure 10] FIG. 10 is a front external view of an end face of a turret to which a cutting tool according to the third embodiment is attached. [Figure 11] FIG. 11 is a block diagram of a cutting tool according to a third embodiment. [Figure 12] FIG. 12 is a diagram illustrating a power receiving antenna circuit according to the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] [Problem that this disclosure aims to solve] In the conventional cutting tools described above, when the battery power is consumed and depleted, it is necessary to replace the battery with a new one. In this case, the old battery must be removed from the battery housing and a new battery must be installed, making it difficult to replace the battery during processing. Therefore, if the machining time becomes long and the battery power runs out during machining, there is a risk that it will no longer be possible to monitor the state of the cutting tool thereafter.

[0007] One solution is to supply power wirelessly to the sensor of the cutting tool. By supplying power wirelessly to the sensor of the cutting tool, it becomes possible to supply power to the cutting tool during processing, and to continuously monitor the state of the cutting tool even if the processing time is long.

[0008] Here, in order to wirelessly supply power to the sensor, it is necessary to provide the cutting tool with a power receiving antenna circuit for receiving the transmitted power. For example, it is conceivable to incorporate a power receiving antenna circuit, instead of a battery, into the main body (shank) of the cutting tool. However, in this case, the receiving antenna circuit must be placed within a limited space, such as the space provided in the main body of the cutting tool, which limits the placement of the receiving antenna circuit and also limits the circuit scale of the receiving antenna circuit, such as the size and number of receiving antenna elements.

[0009] [Effects of this disclosure] According to the present disclosure, it is possible to increase the degree of freedom in the layout of the power receiving antenna circuit and the degree of freedom in the circuit size.

[0010] First, the contents of the embodiment will be listed and described. [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 cutting tool disposed in the machining space and having a power receiving antenna circuit that receives transmitted power from the power transmitting antenna. The cutting tool includes a first tool body provided with a first sensor, and a housing separate from the first tool body, connected to the first tool body via a first power line for supplying power to the first sensor, and housing the power receiving antenna circuit therein.

[0011] According to the above configuration, since the power receiving antenna circuit is housed in a housing that is separate from the first tool body, there is no need to incorporate the power receiving antenna circuit in the first tool body. As a result, the layout and circuit scale of the power receiving antenna circuit are not limited by the first tool body, and the degree of freedom in the layout and circuit scale of the power receiving antenna circuit can be increased.

[0012] (2) In the cutting processing system of (1) above, when the machine tool has a turret that holds the tool body, the housing may include a housing body and a fixing portion that fixes the housing body to an axial end face of the turret. In this case, the housing can be fixed to the turret together with the tool body.

[0013] (3) In the cutting processing system of (2) above, when the housing body has an opposing surface that faces the end face when fixed to the end face, the fixing portion may include an adhesive portion that bonds the end face and the opposing surface. In this case, the housing body can be fixed to the end surface of the turret by an adhesive portion, which can be a magnet, an adhesive, or the like.

[0014] (4) In the cutting processing system of (2) above, when the fixed portion includes a gripped portion that is gripped in the tool mounting groove of the turret, and an arm portion that extends from the gripped portion and has the housing body provided at its tip, the arm portion may extend along an end face of the turret toward the rotation axis of the turret with the gripped portion being gripped in the tool mounting groove. In this case, the housing body can be fixed to the end face of the turret by utilizing the tool attachment groove of the turret. This makes it possible to easily fix the housing body to the turret. Also, the housing body can be easily fixed to the vicinity of the rotation axis of the turret.

[0015] (5) In the cutting system of (2) to (4) above, the housing body may be fixed to an end face of the turret so that the rotation axis of the turret passes through the center of the antenna element of the power receiving antenna circuit. As a result, even when the turret rotates, changes in the relative position of the antenna element with respect to the power transmitting antenna are suppressed, and power transmitted from the power transmitting antenna can be received stably.

[0016] (6) In the cutting system described above in (5), the antenna element may be a loop element. In this case, if the housing body is fixed so that the rotation axis of the turret passes through the center of the loop element, the relative position of the antenna element with respect to the power transmitting antenna will not change significantly even if the turret rotates.

[0017] (7) In any one of the cutting processing systems (1) to (6) above, the cutting processing system may further include a power storage unit provided in either the first tool body or the housing, which stores the power received by the power receiving antenna circuit. In this case, even when the power receiving antenna circuit does not receive transmitted power, the power stored in the power storage unit can be provided to the first sensor.

[0018] (8) In any one of the cutting processing systems (1) to (7) above, the cutting tool may further include a second tool body provided with a second sensor and connected to the housing via a second power line for supplying power to the second sensor, and a power supply control unit that supplies the power received by the power receiving antenna circuit to the first sensor and the second sensor. In this case, power received by one power receiving antenna circuit can be supplied to a plurality of sensors.

[0019] (9) In the cutting processing system of (8) above, if the cutting tool further includes an external device installed outside the processing space and controlling the power supply control unit, and the cutting tool further includes a communication unit capable of communicating with the external device, the power supply control unit may be configured to control the power supplied to the first sensor and the power supplied to the second sensor based on a control command from the external device provided via the communication unit. In this case, the power supply to the first sensor and the second sensor can be controlled from outside the machining space.

[0020] (10) In the cutting processing system of (9) above, the control command may be generated based on at least one of information indicating a state of the machine tool and output information including an output of the first sensor and an output of the second sensor transmitted from the communication unit. By referring to the information indicating the state of the machine tool, it is possible to know which of the first and second tool bodies is currently being used. Furthermore, by referring to the output information, it is possible to ascertain which of the first and second tool bodies is currently being used. Therefore, if a control command is output to the external device so that power is preferentially supplied to the sensor of the tool body in use, efficient power supply is possible.

[0021] (11) In any one of the cutting processing systems (1) to (10) above, the receiving antenna circuit may include a plurality of circuit units having a receiving antenna that receives transmitted power from the transmitting antenna, and a combining circuit that combines the power output by the plurality of circuit units. In this case, each of the multiple circuit units has a power receiving antenna, and each of the multiple circuit units outputs power. Therefore, by combining the powers output by the multiple circuit units, it is possible to receive a larger amount of power.

[0022] (12) An embodiment from another viewpoint is a cutting tool arranged in a machining space of a machine tool, the cutting tool including: a power receiving antenna circuit that receives power transmitted from a power feeding device, the power being transmitted by a power transmitting antenna provided in the machining space; a tool body provided with a sensor; and a housing that is separate from the tool body and that is connected to the tool body via a power line for supplying power to the sensor and that houses the power receiving antenna circuit therein.

[0023] [Details of the embodiment] Hereinafter, preferred embodiments will be described with reference to the drawings. At least a part of each 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 cutting tool 4, a power supply device 6, and an external device .

[0024] The machine tool 2 is, for example, a turret lathe. The machine tool 2 has a turret 8, a drive device 10, and a movement device 12. The cutting tool 4 is attached to a turret 8. A plurality of cutting tools 4 can be attached to the turret 8. The driving device 10 is a device that rotates the turret 8 about a rotation axis C. The moving device 12 is a device that moves the turret 8 along the axial direction. The machine tool 2 also has a spindle portion (not shown) that grips and rotates a workpiece.

[0025] The machine tool 2 rotates and moves the turret 8, moves the cutting tool 4 attached to the turret 8 to a processing position, and performs cutting processing on the workpiece. The cutting process is performed in a machining space S of the machine tool 2. A cutting tool 4, a turret 8, a driving device 10, a moving device 12, a main shaft portion, etc. are disposed 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.

[0026] The cutting tool 4 is a tool for performing cutting processing on a workpiece. More specifically, the cutting tool 4 is a tool for performing turning processing, which is a type of cutting processing. Turning processing is processing performed by pressing a tool against a rotating workpiece. The cutting tool 4 includes a first tool body 20 and a housing 22 that is separate from the first tool body 20. The first tool body 20 and the housing 22 are attached to an end face 8a side of the turret 8. The end face 8a is one of the end faces on both axial sides of the turret 8 that is opposite to the drive device 10 side.

[0027] The cutting tool 4 of this embodiment has a sensor. The sensor has a function of detecting the state of the cutting tool 4. The cutting tool 4 further has a function of transmitting output information indicating the output of the sensor to the outside. The configuration of the cutting tool 4 will be described in detail later.

[0028] The power supply device 6 has a function of wirelessly supplying power to the cutting 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 power supplied from a power source 100 and provides the signal to the power transmission antenna 6a. The power transmission antenna 6a is fixed at a position in the machining space S where power can be wirelessly supplied to the cutting tool 4. The power transmission antenna 6a transmits the power supply signal to the cutting tool 4 as a power supply radio wave. The power transmitted from the power supply device 6 to the cutting tool 4 is used as operating power for the sensor of the cutting tool 4 and power for transmitting output information.

[0029] The power supply device 6 of this embodiment generates and transmits a signal in a frequency band including 5.7 GHz. That is, the power transmission antenna 6a radiates radio waves in a frequency band including 5.7 GHz. The frequency band of the radio waves radiated by the power supply device 6 is not particularly limited, but may be a frequency band including 2.4 GHz from the viewpoint of regulations, etc.

[0030] The external device 7 is a device that is placed outside the machine tool 2 (the machining space S of the machine tool 2). The external device 7 has a function of performing wireless communication with the cutting tool 4. The external device 7 receives output information transmitted by the cutting tool 4 via wireless communication. The external device 7 is configured by a computer etc. The external device 7 includes a processing unit 7a, a storage unit 7b, an input / output unit 7c, and a communication unit 7d.

[0031] The processing unit 7a is, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), a quantum processor, or any other processor suitable for computer control.

[0032] The storage unit 7b is, for example, a flash memory, a hard disk, a ROM (Read Only Memory), a RAM (Random Access Memory), or the like. The storage unit 7b stores computer programs and necessary information to be executed by the processing unit 7a. The processing unit 7a executes computer programs stored in a computer-readable non-transitory recording medium such as the storage unit 7b to realize various processing functions of the processing unit 7a.

[0033] The input / output unit 7c has a function of outputting various information to the outside and a function of receiving operation input by an operator. The input / output unit 7c includes devices such as a monitor, a touch panel, a keyboard, and a mouse. The communication unit 7d has a function of performing wireless communication with the cutting tool 4. The communication unit 7d performs wireless communication with the cutting tool 4 by, for example, Bluetooth (registered trademark). Therefore, the communication unit 7d performs wireless communication using a frequency band including 2.4 GHz.

[0034] The processing unit 7a of the external device 7 has a function of receiving output information transmitted from the cutting tool 4 via the communication unit 7d and performing processing on the output information. The processing unit 7a extracts information indicating the detection result by the sensor from the output information, stores it in the memory unit 7b, and outputs the detection result to the outside via the input / output unit 7c.

[0035] [Regarding the cutting tool according to the first embodiment] FIG. 2 is an external view of an end face 8a of a turret 8 to which a cutting tool 4 according to the first embodiment is attached, as viewed from the front. 2, the turret 8 is a member having a substantially polygonal (octagonal) outer shape. The turret 8 is made of steel such as steel for machine construction. The end surface 8a of the turret 8 has a plurality (eight) of tool attachment grooves 9a, a circular surface portion 9b, and an outer surface portion 9c. The eight tool mounting grooves 9a are provided corresponding to each side of the octagon. The eight tool mounting grooves 9a are recessed in the axial direction with respect to the outer surface portion 9c. The eight tool mounting grooves 9a extend in the radial direction centered on the rotation axis C. The eight tool mounting grooves 9a are connected to each other by an annular groove 9d that surrounds the circular surface portion 9b. The circular surface portion 9b is a surface provided in the center of the end face 8a of the turret 8. The axial position of the circular surface portion 9b may or may not match the axial position of the outer surface portion 9c.

[0036] The cutting tool 4 according to the first embodiment includes the first tool body 20 and the housing 22, as described above. The first tool body 20 has a shank 20a and a cutting tip 20b. The shank 20a is a rectangular prism-shaped member made of metal. The cutting tip 20b is a blade for cutting a workpiece. The cutting tip 20b is detachably attached to the tip of the shank 20a. The first tool body 20 is attached to the tool attachment groove 9 a of the turret 8 .

[0037] In this embodiment, the first tool body 20 is attached to one of the eight tool mounting grooves 9a. The shank 20a of the first tool body 20 is attached to the tool mounting groove 9a together with a fixing plate 21. The fixing plate 21 is a jig for holding the shank 20a in the tool mounting groove 9a. The shank 20a is held between the fixing plate 21 and the wall surface of the tool mounting groove 9a.

[0038] The housing 22 is fixed to the circular surface portion 9b. The housing 22 is fixed on the rotation axis C. Therefore, the housing 22 is fixed to the center of the end surface 8a of the turret 8. The first tool body 20 and the housing 22 are connected to each other via a first power line 24 . First power line 24 is a power line for supplying power from housing 22 to first tool body 20. First tool body 20 is provided with a sensor and a wireless communication unit (described later). Housing 22 houses a rectenna (described later). First power line 24 is a power line for supplying power output by the rectenna to the sensor and the wireless communication unit.

[0039] FIG. 3 is a block diagram showing an example of the configuration of the cutting tool 4. As shown in FIG. 3, the cutting tool 4 has, in addition to the first tool body 20 and the housing 22 described above, a first sensor 26, a wireless communication unit 28, a power control unit 30, a power storage unit 32, and a power receiving antenna circuit 33.

[0040] The first sensor 26, the wireless communication unit 28, the power control unit 30, and the power storage unit 32 are provided on the shank 20a. The first sensor 26, the wireless communication unit 28, the power control unit 30, and the power storage unit 32 are housed in a space provided inside the shank 20a. On the other hand, the power receiving antenna circuit 33 is housed inside the housing 22 .

[0041] The power receiving antenna circuit 33 receives transmitted power from the power transmitting antenna 6a of the power supply device 6. The power receiving antenna circuit 33 has one rectenna 34. The rectenna 34 has a power receiving antenna 34a and a rectifier circuit 34b. The power receiving antenna 34a receives radio waves for power supply from the power supply device 6. The power receiving antenna 34a provides an electric signal corresponding to the received radio waves to the rectifier circuit 34b. The rectifier circuit 34b rectifies the electric signal provided from the power receiving antenna 34a, converts it into DC power, and outputs it. The DC power output by the rectifier circuit 34b is provided to the power control unit 30 of the first tool body 20 via the first power line 24.

[0042] Fig. 4 is a cross-sectional view of the housing 22. Fig. 4 shows a cross section along a vertical plane including the rotation axis C. The housing 22 has a box-shaped housing main body 22a, a partition plate 22b, and a waterproof connector 22c.

[0043] The housing body 22a is a hollow box-shaped member made of resin, etc. The internal space of the housing body 22a is sealed, thereby preventing cutting oil from entering the internal space of the housing body 22a. Waterproof connector 22c is a connector for connecting first power line 24 and rectenna 34 (power receiving antenna circuit 33) inside housing 22. Waterproof connector 22c prevents cutting oil from entering housing 22 from the connection portion between first power line 24 and rectenna 34.

[0044] In the housing body 22a, the outer plate 40 on the turret 8 side is disposed along the circular surface portion 9b of the end face 8a of the turret 8. The outer plate 40 has an opposing surface 40a that faces the circular surface portion 9b. A fixing portion 42 is fixed to the inner surface 40b of the outer plate 40. The fixing portion 42 has a function of fixing the housing body 22a to the turret 8. The fixing portion 42 in this embodiment includes a plate-shaped magnet 48. The magnet 48 is fixed to the inner surface 40b with an adhesive or the like. In other words, the magnet 48 is fixed within the space inside the housing body 22a.

[0045] Here, the circular surface portion 9b and the opposing surface 40a are adhered to each other by the magnetic force of the magnet 48. As a result, the housing main body 22a is fixed to the circular surface portion 9b. In other words, the magnet 48 constitutes an adhesion portion that adheres the circular surface portion 9b and the opposing surface 40a to each other. Furthermore, since the housing body 22a is fixed to the circular surface portion 9b of the turret 8 by magnetic force, the housing body 22a can be easily attached to and detached from the turret 8, and the fixed position can also be easily changed.

[0046] Furthermore, since the magnet 48 is fixed within the space inside the housing body 22a, it is possible to prevent metal powder and chips generated by the cutting process from directly adhering to the magnet 48 due to magnetic force, making it easier to remove metal powder and chips adhering to the housing body 22a after processing.

[0047] The partition plate 22b is a plate-like member made of resin etc. The partition plate 22b is provided inside the housing main body 22a in a state facing the outer plate 40. A rectenna 34 is provided on a plate surface 22b1 of the partition plate 22b facing the opposite side to the outer plate 40. The rectenna 34 has a circuit board 34c.

[0048] FIG. 5 is a diagram showing the board surface of the circuit board 34c in FIG. As shown in FIG. 5, a power receiving antenna 34a and a circuit chip 35 are mounted on a board surface 34c1 of the circuit board 34c. The power receiving antenna 34a includes a C-shaped loop element 34a1 and a pair of lines 34a2. The loop element 34a1 and the pair of lines 34a2 are metal foils such as copper foils patterned on the substrate surface 34c1. The loop element 34a1 is an antenna element for receiving power transmitted from the power supply device 6. The pair of lines 34a2 connect both ends of the loop element 34a1 to the circuit chip 35. The circuit chip 35 is a circuit chip including a rectifier circuit 34b. The first power line 24 is connected to the circuit chip 35.

[0049] The housing body 22a of this embodiment is fixed to the circular surface portion 9b of the turret 8 so that the rotation axis C passes through the center P of the loop element 34a1 (antenna element). The position of the power receiving antenna 34a can be changed by moving the housing 22 (housing main body 22a) on the circular surface portion 9b. Even if the power receiving antenna 34a is fixed to a position where the rotation axis C does not pass through the center of the loop element 34a1, the power receiving antenna 34a is fixed to a position closer to the rotation axis C on the end face 8a of the turret 8 because it is fixed to the circular surface portion 9b. Therefore, the power receiving antenna 34a can properly receive radio waves from the power transmitting antenna 6a even if the turret 8 rotates.

[0050] However, it is preferable that the power receiving antenna 34a is fixed to the turret 8 so that the rotation axis C passes through the center P of the loop element 34a1. As a result, even when the turret 8 rotates around the rotation axis C, changes in the relative position of the power receiving antenna 34a (loop element 34a1) with respect to the power transmitting antenna 6a in the machining space S are suppressed, and the transmitted power from the power transmitting antenna 6a can be received more stably.

[0051] In this embodiment, the housing body 22a is formed from resin, but the housing body 22a may be formed from a metal such as a steel plate. In this case, a window made of resin or the like is provided in a part of the housing body 22a to allow radio waves from the power transmitting antenna 6a to pass therethrough.

[0052] In FIG. 3, the power control unit 30 provided in the first tool body 20 is supplied with DC power from the rectenna 34 (power receiving antenna circuit 33) via the first power line 24, as described above. The power control unit 30 has the function of converting the DC power provided from the rectenna 34 to a predetermined voltage, controlling the charging and discharging of the power storage unit 32, and providing the DC power from the rectenna 34 and the DC power from the power storage unit 32 to the first sensor 26 and the wireless communication unit 28. Furthermore, when DC power is provided from the rectenna 34, the power control unit 30 can provide DC power only to the power storage unit 32. In this case, the first sensor 26 and the wireless communication unit 28 are provided with DC power from the power storage unit 32. Furthermore, when DC power is not provided from rectenna 34, power control unit 30 can provide the DC power stored in power storage unit 32 to first sensor 26 and wireless communication unit 28.

[0053] The power storage unit 32 includes, for example, a battery or a capacitor. The power storage unit 32 stores DC power provided via the power control unit 30. The power storage unit 32 also discharges the stored power based on the control of the power control unit 30.

[0054] The first sensor 26 is a sensor for detecting the state of the shank 20a. More specifically, the first sensor 26 includes a strain sensor, a temperature sensor, an acceleration sensor, and the like. The first sensor 26 has a function of detecting the strain, temperature, and acceleration (vibration), which are the states of the shank 20a. When DC power is provided from the power control unit 30, the first sensor 26 provides an output indicating the result of detecting the state of the shank 20a to the wireless communication unit 28.

[0055] The wireless communication unit 28 has an antenna 28a, and has a function of performing wireless communication with the external device 7. The wireless communication unit 28 wirelessly transmits the output provided from the first sensor 26 as output information. When the wireless communication unit 28 is provided with DC power from the power control unit 30, it establishes a communication connection with the external device 7 and starts wireless transmission of the output information.

[0056] When performing cutting processing using the cutting processing system 1, first, an operator of the system 1 attaches a necessary cutting tool 4 to the turret 8. Furthermore, the operator attaches a workpiece to the spindle portion. After that, the operator closes the cover of the machine tool 2 to close the processing space S. Next, the operator starts wireless power supply from the power supply device 6 to the cutting tool 4 . As a result, the cutting tool 4 receives the transmitted power from the power supply device 6. When power is provided from the power supply device 6, the first sensor 26 of the cutting tool 4 starts detecting the state of the shank 20a and outputting the detection result. Furthermore, the wireless communication unit 28 establishes a communication connection with the external device 7 and starts wireless transmission of output information. Thereafter, the operator operates the machine tool 2 to start cutting.

[0057] At this time, the first sensor 26 of the cutting tool 4 provides an output indicating the result of detecting the state of the cutting tool 4 to the wireless communication unit 28. The wireless communication unit 28 wirelessly transmits the output provided from the first sensor 26 as output information. The output information transmitted by the wireless communication unit 28 is received by the external device 7. The external device 7 that has received the output information acquires information indicating the state of the shank 20a from the output information. The external device 7 outputs the acquired information indicating the state of the shank 20a from the input / output unit 7c. This enables the external device 7 to output the machining state (the state of the cutting tool 4) during cutting to the operator.

[0058] According to the above configuration, since the power receiving antenna circuit 33 (rectenna 34) is housed in the housing 22 which is separate from the first tool body 20, it is not necessary to incorporate the power receiving antenna circuit 33 in the first tool body 20. As a result, the degree of freedom in the arrangement of the power receiving antenna circuit 33 and the degree of freedom in the circuit scale can be increased.

[0059] In addition, in this embodiment, the machine tool 2 has a turret 8, and the housing 22 is equipped with a housing main body 22a and a fixing portion 42 (magnet 48) that fixes the housing main body 22a to the circular surface portion 9b of the turret 8, so that the housing 22 can be fixed to the turret 8 together with the first tool body 20. Furthermore, the magnet 48 can adhere and fix the circular surface portion 9b and the opposing surface 40a of the housing main body 22a by magnetic force. In this embodiment, the circular surface portion 9b and the opposing surface 40a are bonded together by the magnetic force of the magnet 48. However, an adhesive layer made of adhesive, adhesive tape, or the like may be provided between the circular surface portion 9b and the opposing surface 40a, and the circular surface portion 9b and the opposing surface 40a may be bonded together by this adhesive layer.

[0060] In the present embodiment, the power control unit 30 and the power storage unit 32 are provided in the shank 20a, but as shown in FIG. 6, the power control unit 30 and the power storage unit 32 may be housed in the housing 22. Since the housing 22 is fixed on the circular surface portion 9b, it is relatively easy to ensure a space in the housing 22 for housing the power control unit 30 and the power storage unit 32. In addition, there is no need to provide a space in the shank 20a for housing the power control unit 30 and the power storage unit 32. Furthermore, by minimizing the space provided in the shank 20a, the strength of the shank 20a can be maintained at a higher level.

[0061] Furthermore, in this embodiment, the case where one cutting tool 4 is attached to the turret 8 has been exemplified, but as shown in FIG. 7, two or more cutting tools 4 may be attached. In this case, it is not possible to arrange all of the housings 22 of the cutting tools 4 at positions through which the rotation axis C passes. However, the housings 22 can be freely positioned at any position on the circular surface portion 9b by the magnets 48. Therefore, by arranging each housing 22 around the rotation axis C as shown in FIG. 7, each housing 22 (power receiving antenna circuit 33) can be positioned so that it moves as little as possible relative to the power transmitting antenna 6a even if the turret 8 rotates.

[0062] [Regarding the second embodiment] FIG. 8 is a front view of an end face 8a of a turret 8 to which a cutting tool 4 according to the second embodiment is attached. This embodiment differs from the first embodiment in that the fixed portion 42 of the housing 22 has a gripped portion 50 and an arm portion 52 instead of the magnet 48. The housing 22 may or may not have a partition plate 22b.

[0063] The gripped portion 50 and the arm portion 52 are resin members that are integrally provided on the housing main body 22a. The gripped portion 50 is a rectangular member, and is gripped in a tool attachment groove 9a of the turret 8. The tool attachment groove 9a in which the gripped portion 50 is gripped is located on the opposite side of the rotation axis C to the tool attachment groove 9a in which the first tool body 20 is gripped.

[0064] Like the shank 20a, the gripped portion 50 is attached to the tool attachment groove 9a together with the fixing plate 51. The gripped portion 50 is gripped between the fixing plate 51 and the wall surface of the tool attachment groove 9a.

[0065] FIG. 9 shows a cross-sectional view taken along line IV-IV in FIG. In FIG. 9, the turret 8 is shown in cross section, and the housing 22 is shown in external appearance. 9, the arm portion 52 extends from the grasped portion 50. The housing main body 22a is provided at a tip 52a of the arm portion 52. Thus, the arm portion 52 connects the grasped portion 50 and the housing main body 22a.

[0066] In addition, the arm portion 52 is aligned along the circular surface portion 9b (end surface 8a) of the turret 8 when the gripped portion 50 is gripped in the tool attachment groove 9a. The arm portion 52 also extends toward the rotation axis C of the turret 8. Therefore, by placing the housing 22 on the turret 8 so that the gripped portion 50 is gripped by the tool mounting groove 9a and the arm portion 52 is aligned along the circular surface portion 9b, the housing main body 22a can be easily fixed near the rotation axis C of the turret 8.

[0067] Further, a spacer 54 is provided on an inner surface 50a of the gripped portion 50. The inner surface 50a is a surface of the gripped portion 50 that faces the rotation axis C side. The spacer 54 is interposed between the inner surface 50a and the outer circumferential surface 9d1 of the annular groove 9d. By placing the housing 22 on the turret 8 with the spacer 54 abutting against the outer circumferential surface 9d1, the housing main body 22a can be placed at a fixed position on the circular surface portion 9b. Moreover, by adjusting the thickness of the spacer 54, the position on the circular surface portion 9b of the housing main body 22a can be adjusted. The housing body 22a of the present embodiment is fixed to the circular surface portion 9b by adjusting the thickness of the spacer 54 so that the rotation axis C passes through the center of the loop element 34a1.

[0068] [Regarding the third embodiment] FIG. 10 is a front view of an end face 8a of a turret 8 to which a cutting tool 4 according to the third embodiment is attached. This embodiment differs from the first embodiment in that the cutting tool 4 includes a second tool body 60 in addition to the first tool body 20.

[0069] The second tool body 60 has a shank 60a and a cutting tip 60b, similar to the first tool body 20. The second tool body 60 is held in a tool mounting groove 9a located adjacent in the circumferential direction to the tool mounting groove 9a in which the first tool body 20 is held. The second tool body 60 is held between a fixing plate 61 and a wall surface of the tool mounting groove 9a. The second tool body 60 is connected to the housing 22 by a second power line 62. The second power line 62 is a power line for supplying electric power from the housing 22 side to the second tool body 60 side.

[0070] FIG. 11 is a block diagram of a cutting tool 4 according to the third embodiment. As shown in FIG. 11, the shank 20a of the first tool body 20 is provided with a first sensor 26, a power control unit 30, and a power storage unit 32. Further, the shank 60a of the second tool body 60 is provided with a second sensor 66, a power control unit 70, and a power storage unit 72. The second sensor 66, the power control unit 70, and the power storage unit 72 have the same configuration as the first sensor 26, the power control unit 30, and the power storage unit 32. In other words, the second tool body 60 has the same configuration as the first tool body 20.

[0071] Furthermore, cutting tool 4 of the present embodiment includes, in addition to rectenna 34, a power supply control unit 76 and a wireless communication unit 78 within housing 22. The power supply control unit 76 has a function of supplying the power received by the rectenna 34 (power receiving antenna circuit 33) to the first sensor 26, the second sensor 66, and the wireless communication unit 78.

[0072] The power supply control unit 76 and the power control unit 30 of the first tool body 20 are connected to each other by the first power line 24. The power supply control unit 76 supplies power to the first sensor 26 via the first power line 24 and the power control unit 30. The power supply control unit 76 and the power control unit 70 of the second tool body 60 are connected to each other by the second power line 62. The power supply control unit 76 supplies power to the second sensor 66 via the second power line 62 and the power control unit 70. When DC power is provided from the rectenna 34 , the power supply control unit 76 provides power to both sensors 26 , 66 and the wireless communication unit 78 .

[0073] The wireless communication unit 78 has an antenna 78a and has a function of performing wireless communication with the external device . In the cutting tool 4 of this embodiment, the first tool body 20 and the second tool body 60 do not have a communication function with the external device 7, and a wireless communication unit 78 is provided in the housing 22, thereby consolidating the communication function with the external device 7.

[0074] The wireless communication unit 78 and both sensors 26, 66 are connected to each other. The outputs of both sensors 26, 66 are provided to the wireless communication unit 78. The wireless communication unit 78 wirelessly transmits the outputs provided from both sensors 26, 66 as output information. The wireless communication unit 78 transmits the output information of the first sensor 26 and the output information of the second sensor 66 to the external device 7 in an identifiable manner. When DC power is provided from the power supply control unit 76, the wireless communication unit 78 establishes a communication connection with the external device 7 and starts wireless transmission of output information.

[0075] Furthermore, the wireless communication unit 78 has a function of receiving a control command transmitted from the external device 7 and providing the control command to the power supply control unit 76 . The power supply control unit 76 controls the power supplied to the first sensor 26 and the power supplied to the second sensor 66 based on a control command from the external device 7 provided via the wireless communication unit 78. More specifically, the control command includes information indicating either the first sensor 26 or the second sensor 66. The power supply control unit 76 supplies more power to the sensor indicated by the control command.

[0076] The processing unit 7a (see FIG. 1) of the external device 7 generates a control command based on the output information transmitted from the wireless communication unit 78. The processing unit 7a compares the output information of the first sensor 26 with the output information of the second sensor 66, and determines which of the first tool body 20 and the second tool body 60 is in use (during machining). Next, the processing unit 7a causes information indicating the sensor of the tool body determined to be in use to be included in the control command. As a result, the power supply control section 76 supplies more power to the sensor of the tool body that is in use.

[0077] In this embodiment, the cutting tool 4 is equipped with a power supply control unit 76 that supplies the power received by the rectenna 34 to the first sensor 26 and the second sensor 66, so that the power received by one rectenna 34 can be supplied to multiple sensors.

[0078] In addition, in this embodiment, the cutting tool 4 is equipped with a wireless communication unit 78 capable of communicating with an external device 7, and the power supply control unit 76 is configured to control the power supplied to the first sensor 26 and the power supplied to the second sensor 66 based on a control command from the external device 7 provided via the wireless communication unit 78, so that the power supply to the first sensor 26 and the second sensor 66 can be controlled from outside the machining space S.

[0079] Furthermore, the control command is generated based on the output information transmitted from the wireless communication unit 78. By referring to the output information, it is possible to know which of the first tool body 20 and the second tool body 60 is being used. The external device 7 generates a control command to supply more power to the sensor of the tool body in use. In other words, the external device 7 generates a control command to preferentially supply power to the sensor of the tool body in use, thereby enabling efficient power supply.

[0080] In the present embodiment, the case where the control command is generated based on the output information has been exemplified. However, when the external device 7 is capable of acquiring information indicating the state of the machine tool 2, the control command may be generated based on the information indicating the state of the machine tool 2. The information indicating the state of the machine tool 2 includes information indicating which of the tool bodies attached to the turret 8 is being used. Therefore, by referring to the information indicating the state of the machine tool 2, it is possible to know which of the first tool body 20 and the second tool body 60 is being used. Therefore, based on the information indicating the state of the machine tool 2, the external device 7 can generate a control command for supplying more power to the sensor of the tool body being used.

[0081] In the present embodiment, a case has been exemplified in which the first tool body 20 and the second tool body 60 do not have a communication function with the external device 7, and the wireless communication unit 78 is provided in the housing 22 to aggregate the communication function with the external device 7. However, the first tool body 20 and the second tool body 60 may each be provided with a communication unit for communicating with the external device 7, and each of the first tool body 20 and the second tool body 60 may be configured to transmit output information of the sensor.

[0082] In addition, in this embodiment, the power control units 30, 70 and the power storage units 32, 72 are provided on the shanks 20a, 60a. However, the power control units 30, 70 and the power storage units 32, 72 may be housed in the housing 22.

[0083] [Regarding the Fourth Embodiment] FIG. 12 is a diagram showing a power receiving antenna circuit 33 according to the fourth embodiment. This embodiment differs from the first embodiment in that the power receiving antenna circuit 33 includes two rectennas .

[0084] The power receiving antenna circuit 33 of this embodiment includes two rectennas 34 and a combining circuit 84. The two rectennas 34 receive radio waves for power supply from the power supply device 6 and output DC power. The combining circuit 84 combines the DC powers output by the two rectennas 34. The combined DC power is provided to the power control unit 30 of the first tool body 20 via the first power line 24.

[0085] The two rectennas 34 included in the power receiving antenna circuit 33 of this embodiment each constitute a circuit section having a power receiving antenna 34a that receives the transmitted power from the power transmitting antenna 6a. That is, in this embodiment, the two rectennas 34 each have a power receiving antenna 34a, and each of the two rectennas 34 outputs power. Therefore, by combining the powers output by the two rectennas 34, it is possible to receive more power.

[0086] In this embodiment, the power receiving antenna circuit 33 includes two rectennas 34, but may include a greater number of rectennas. The power receiving antenna circuit 33 shown in FIG. 12 can be applied not only to the cutting tool 4 of the first embodiment but also to the cutting tools 4 of the other embodiments.

[0087] 〔others〕 It should be noted that the embodiments disclosed herein are illustrative in all respects and are not restrictive. In the above embodiment, the power receiving antenna 34a has the loop element 34a1 as an antenna element to configure a loop antenna. However, the power receiving antenna 34a may be configured as a dipole antenna having a pair of linear elements or a patch antenna having a patch element, other than the loop antenna. The center of the antenna element in a dipole antenna is the pair of base ends of a pair of linear elements or the midpoint of the pair of base ends, while the center of the antenna element in a patch antenna is the center of the radiation surface of the patch element.

[0088] In the above embodiment, the cutting tool 4 is a tool for performing turning, but the cutting tool 4 may be a tool for performing a milling process, which is a type of cutting process. The milling process is a process in which a tool is pressed against a fixed workpiece while rotating.

[0089] The scope of the present invention is defined by the claims, not by the meaning described above, and is intended to include all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0090] 1. Cutting processing system 2 Machine tools 4 cutting tools 6 Power supply equipment 6a Transmission antenna 6b Power transmission section 7 External device 7a Processing section 7b Storage section 7c Input / output section 7d Communication Department 8 Turrets 8a End face 9a Tool mounting groove 9b Circular surface part 9c External part 9d Annular groove 9d1 Outer surface 10 Drive unit 12 Mobile Devices 20 1st tool body 20a shank 20b Cutting tip 21 Fixing plate 22 Case 22a Main unit 22b Partition 22b1 plate surface 22c waterproof connector 24 First Power Line 26 First Sensor 28 Wireless Communication Division 28a Antenna 30 Power Control Unit 32 Power storage unit 33 Receiving antenna circuit 34 Rectenna (circuit section) 34a Receiving antenna 34a1 Loop element 34a2 track 34b rectifier circuit 34c circuit board 34c1 Board surface 35 Circuit Chip 40 Outer plate 40a Opposite surface 40b Inside 42 Fixed part 48 Magnet 50 Grasped part 50a Inner surface 51 Fixing plate 52 Arm section 52a Tip 54 Spacer 60 2nd tool body 60a shank 60b Cutting Tip 61 Fixing plate 62 Second Power Line 66 Second Sensor 70 Power Control Unit 72 Power storage unit 76 Power supply control section 78 Wireless Communication Section 78a Antenna 84 Synthesis circuit 100 power supply C Rotational Axis P Center S Processing space

Claims

1. a power supply device that transmits power via a power transmission antenna provided in a machining space of the machine tool; a cutting tool disposed in the machining space and having a power receiving antenna circuit that receives transmitted power from the power transmitting antenna, The cutting tool comprises: a first tool body provided with a first sensor; a housing provided separately from the first tool body and connected to the first tool body via a first power line for supplying power to the first sensor; The machine tool has a turret that holds the tool body, the turret includes a tool attachment groove for attaching the tool body, and a shaft side region that is a region on an end face of the turret in a rotation axis direction, the shaft side region being a region closer to the rotation axis of the turret than the tool attachment groove, The housing includes: a housing body that houses the power receiving antenna circuit and outputs the received power; a fixing portion that fixes the housing body to an end surface in the rotation axis direction of the turret, The housing body is disposed in the shaft side region of the turret. Cutting processing system.

2. the housing body has an opposing surface that faces the end surface of the turret when the housing body is fixed to the end surface of the turret, The fixing portion includes an adhesive portion that bonds the end surface and the opposing surface. The cutting system according to claim 1 .

3. The fixing portion is A gripped portion that is gripped in a tool mounting groove of the turret; an arm portion extending from the gripped portion and having the housing body provided at a tip end thereof; The arm portion extends along an end face of the turret toward a rotation axis of the turret with the gripped portion gripped in the tool attachment groove. The cutting system according to claim 1 .

4. The housing body is fixed to an end surface of the turret so that a rotation axis of the turret passes through a center of an antenna element of the power receiving antenna circuit. The cutting system according to claim 1 .

5. The antenna element is a loop element. The cutting system according to claim 4 .

6. The power receiving device further includes a power storage unit provided in either the first tool body or the housing, the power storage unit storing the power received by the power receiving antenna circuit. The cutting system according to any one of claims 1 to 5.

7. The cutting tool comprises: a second tool body provided with a second sensor and connected to the housing via a second power line for supplying power to the second sensor; a power supply control unit that supplies the power received by the power receiving antenna circuit to the first sensor and the second sensor. The cutting system according to any one of claims 1 to 5.

8. The apparatus further includes an external device that is installed outside the processing space and controls the power supply control unit, The cutting tool further includes a communication unit capable of communicating with the external device, The power supply control unit controls the power supplied to the first sensor and the power supplied to the second sensor based on a control command from the external device provided via the communication unit. The cutting system according to claim 7.

9. The control command is generated based on at least one of information indicating a state of the machine tool and output information including an output of the first sensor and an output of the second sensor transmitted from the communication unit. The cutting system according to claim 8.

10. The receiving antenna circuit includes: a plurality of circuit units each having a power receiving antenna for receiving power transmitted from the power transmitting antenna; A combining circuit that combines the powers output by the plurality of circuit units. The cutting system according to any one of claims 1 to 5.

11. A cutting tool disposed in a machining space of a machine tool, a power receiving antenna circuit that receives power transmitted from a power feeding device via a power transmitting antenna provided in the machining space; A tool body provided with a sensor; a housing provided separately from the tool body and connected to the tool body via a power line for supplying power to the sensor; The machine tool has a turret that holds the tool body, the turret includes a tool attachment groove for attaching the tool body, and a shaft side region that is a region on an end face of the turret in a rotation axis direction, the shaft side region being a region closer to the rotation axis of the turret than the tool attachment groove, The housing includes: a housing body that houses the power receiving antenna circuit and outputs the received power; a fixing portion that fixes the housing body to an end surface in the rotation axis direction of the turret; The housing body is disposed in the shaft side region of the turret. cutting tools.

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