Machine tools and machining systems

Abstract

The present invention provides a technology that enables a machine tool to utilize regenerative energy from peripheral equipment that employs a resistance regeneration method, thereby realizing power saving in the entire system. The machine tool (10) includes a computer numerically controlled (CNC) device (105), an amplifier (103) that drives a motor (104), a power system (102) that supplies power to the amplifier (103) for driving the motor (104), and a voltage converter (106) that adjusts the voltage of the regenerative power of an inverter (201) that drives a peripheral equipment (20) that assists in machining of the machine tool (10) to the voltage of the power system (102).

Description

[Technical field]

[0001] The present disclosure relates to machine tools and machining systems. [Background technology]

[0002] 2. Description of the Related Art Conventionally, power regeneration devices that employ a power regeneration system and suppress heat generation at the time of regeneration start-up are known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 08-103821 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the regenerative power of peripheral devices that employ a resistance regeneration system is consumed as heat, so the power efficiency of a machining system equipped with peripheral devices that use the resistance regeneration system is poor.

[0005] The present disclosure aims to provide a machining device that improves power efficiency in a machining system that includes peripheral devices that employ a resistance regeneration system. [Means for solving the problem]

[0006] The present disclosure relates to a machine tool including a computer numerically controlled (CNC) device, an amplifier for driving a motor, a power system for supplying power to the amplifier for driving the motor, and a voltage converter for adjusting the voltage of regenerative power of an inverter for driving peripheral devices that assist the machining of the machine tool to the voltage of the power system. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a technology that enables a machine tool to utilize regenerative energy from peripheral devices that employ a resistance regeneration system, thereby realizing power savings in the entire system. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing a machining system according to a first embodiment. [Diagram 2] FIG. 11 is a diagram showing a machining system according to a second embodiment. [Diagram 3] FIG. 13 is a diagram showing a machining system according to a third embodiment. [Figure 4] FIG. 13 is a diagram showing a machining system according to a fourth embodiment. [Diagram 5] FIG. 13 is a diagram showing a machining system according to a fifth embodiment. [Figure 6] FIG. 13 is a diagram showing a machining system according to a sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In each drawing used in the description, the configuration may be omitted for the sake of explanation. In addition, in each drawing and in this specification, the same reference numerals indicate similar elements.

[0010] <First embodiment> 1 shows a machining system 1 according to a first embodiment of the present disclosure. The machining system 1 includes a machine tool 10 and a peripheral device 20. The machine tool 10 and the peripheral device 20 are connected to a power supply line 30.

[0011] The machine tool 10 includes a power supply circuit 101, a machine tool 102, an amplifier 103, a motor 104, a CNC (Computer Numerical Control) device 105, and a voltage converter 106.

[0012] The power supply circuit 101 is a circuit for supplying power from the power line 30 to the power system 102 .

[0013] An electric power system 102 supplies electric power to an amplifier 103 such as a servo amplifier for driving a motor 104. Normally, the servo amplifier controls the motor 104 by PWM (Pulse Width Modulation), so that the electric power from the electric power system 102 is supplied to each servo amplifier as DC.

[0014] The amplifier 103 drives a motor 104 of the machine tool 10. For example, the amplifier 103 is a servo amplifier. The machine tool 10 is provided with at least one or more amplifiers 103_1 to 103_n (n is a natural number).

[0015] The motor 104 is, for example, a servo motor. The machine tool 10 is provided with at least one or more motors 104_1 to 104_n (n is a natural number) corresponding to the at least one or more amplifiers 103_1 to 103_n, respectively.

[0016] The CNC device 105 is a device for controlling the overall operation of the machine tool 10, such as the driving of the motor 104. For example, as shown in Fig. 1, the CNC device 105 transmits control signals to the amplifiers 103_1 to 103_n to drive the motors 104_1 to 104_n of the amplifiers 103_1 to 103_n.

[0017] The voltage converter 106 is configured to adjust the voltage of the regenerative power from the inverter 201 of the peripheral device 20 to the voltage of the power grid 102 .

[0018] For example, the voltage converter 106 measures the voltage of the regenerated power from the inverter 201, and sets a conversion magnification based on the measured voltage of the regenerated power. The voltage converter 106 adjusts the voltage of the regenerated power measured based on the conversion magnification so that it matches the voltage of the power grid 102, thereby matching the voltage of the regenerated power from the inverter 201 to the voltage of the power grid 102.

[0019] As a specific example, assume that the voltage of the power grid 102 is 200V and the voltage of the regenerated power from the inverter 201 is 50V. The voltage converter 106 calculates a conversion magnification based on the voltage of the power grid 102 and the measured voltage of the regenerated power so that the voltage of the measured regenerated power matches the voltage of the power grid 102. More specifically, the voltage converter 106 divides the voltage of the power grid 102 (200V) by the measured voltage of the regenerated power (50V) to calculate the conversion magnification (4x). The voltage converter 106 multiplies the voltage of the regenerated power from the inverter 201 (50V) by the set conversion magnification (4x) to match the voltage of the measured regenerated power to the voltage of the power grid 102 (200V).

[0020] The peripheral equipment 20 is equipment for assisting the machining of the machine tool 10, such as a coolant device or a chip conveyor. The coolant device supplies a coolant liquid necessary for the operation of the machine tool 10. The peripheral equipment 20 may further be a mist collector that supplies air, an air compressor, etc. The types of the peripheral equipment 20 are not limited to these.

[0021] The inverter 201 drives a motor 202 such as a pump of the peripheral device 20. The output of the peripheral device 20 is adjusted by controlling the inverter 201. The inverter 201 is of a resistance regeneration type. When there is regenerative power of the inverter 201 that is not supplied to the machine tool 10, the regenerative power may be consumed by an external resistor of the inverter 201.

[0022] The motor 202 is, for example, a motor of a pump that supplies coolant liquid to the machine tool 10 .

[0023] According to the machine tool 10 according to the first embodiment described above, the following effects are achieved.

[0024] The machine tool 10 includes a CNC device 105, an amplifier 103 for driving a motor 104, a power system 102 for supplying power for driving the amplifier 103 to the amplifier 103, and a voltage converter 106 for adjusting the voltage of the regenerative power of an inverter 201 for driving a peripheral device 20 for assisting the machining of the machine tool 10 to the voltage of the power system 102. This allows the machine tool to utilize regenerative energy from the peripheral device, thereby improving the power efficiency of the machining system as a whole. Furthermore, even if a currently used peripheral device of the resistance regeneration type needs to be replaced, it is possible to improve the power efficiency and realize energy saving while continuing to use the peripheral device of the resistance regeneration type without replacing it with a peripheral device of the power regeneration type. Furthermore, since the present invention can be applied to any peripheral device having an inverter, it is possible to improve the power efficiency and realize energy saving in various machining systems even if the peripheral device is replaced due to a change in the required specifications of the machining contents.

[0025] <Second embodiment> 2 shows a machining system 1 according to a second embodiment of the present disclosure. Differences from the first embodiment will be mainly described.

[0026] The machining system 1 includes a machine tool 10, a first peripheral device 20_1, and a second peripheral device 20_2. The first peripheral device 20_1 and the second peripheral device 20_2 are devices similar to the peripheral device 20 of the first embodiment. Three or more peripheral devices 20 may be provided in the machining system 1.

[0027] The machine tool 10 further includes a selector 107. The selector 107 is connected to the inverter 201_1 of the first peripheral device 20_1 and the inverter 201_2 of the second peripheral device 20_2. The selector 107 is further connected to a voltage converter 106 and supplies regenerative energy of either the first peripheral device 20_1 or the second peripheral device 20_2 to the voltage converter 106.

[0028] When the CNC device 105 controls the on / off of the operation of the peripheral devices 20, the selector 107 selects one of the multiple peripheral devices according to a command from the CNC device 105 linked to the on / off control, and connects the selected inverter 201 to the voltage converter 106. The regenerative power of the peripheral devices 20 of the selected inverter 201 is input to the voltage converter 106.

[0029] According to the machine tool 10 according to the second embodiment described above, the following effects are achieved.

[0030] The machine tool 10 further includes a selector 107 which selects, according to a command from a CNC device 105, which of the multiple peripheral devices 20 (20_1, 20_2) the regenerative power from which is to be input to a voltage converter 106. This allows the machine tool to utilize regenerative energy from the multiple peripheral devices, thereby improving the power efficiency of the entire machining system.

[0031] <Third embodiment> 3 shows a machining system 1 according to a third embodiment of the present disclosure. Differences from the first and second embodiments will be mainly described.

[0032] The machine tool 10 further includes a voltage detection unit 108_1 corresponding to the peripheral device 20_1, and a voltage detection unit 108_2 corresponding to the peripheral device 20_2.

[0033] The voltage detection unit 108 is connected to the corresponding inverter 201 and the selector 107. The voltage detection unit 108 detects regenerative energy from the corresponding peripheral device 20. When the voltage detection unit 108 detects regenerative power, the voltage detection unit 108 notifies the selector 107 of the detection.

[0034] The selector 107 selects the peripheral device 20 corresponding to the voltage detection unit 108 that detected the regenerative power, and connects the inverter 201 of the selected peripheral device 20 to the voltage converter 106. The regenerative power is input to the voltage converter 106.

[0035] According to the machine tool 10 according to the third embodiment described above, the following effects are achieved.

[0036] Machine tool 10 further includes a selector 107 that selects which of the multiple peripheral devices (20_1, 20_2) to input regenerative power from to voltage converter 106, and multiple voltage detection units (108_1, 108_2) associated with the multiple peripheral devices (20_1, 20_2), respectively, and selector 107 selects the regenerative power from the peripheral device 20 corresponding to the voltage detection unit 108 that detected the voltage among the multiple voltage detection units (108_1, 108_2) to be input to voltage converter 106. This allows regenerative energy from the multiple peripheral devices to be utilized by the machine tool, and the power efficiency of the machining system as a whole can be improved.

[0037] <Fourth embodiment> 4 shows a machining system 1 according to a fourth embodiment of the present disclosure. Differences from the first to third embodiments will be mainly described.

[0038] The machine tool 10 further includes a voltage measurement unit 109. The voltage measurement unit 109 is connected to the selector 107 and the voltage converter .

[0039] The voltage measuring unit 109 is a device that measures the voltage of the regenerative power from the peripheral device 20 selected by the selector 107 from among the multiple peripheral devices 20 .

[0040] The voltage converter 106 is further configured to set a conversion factor based on the measured voltage of the regenerative power. The voltage converter 106 is further configured to adjust the measured voltage of the regenerative power based on the conversion factor so that the voltage matches the voltage of the electric power grid 102.

[0041] For example, assume that the voltage of the power grid 102 is 200V, the voltage of the regenerated power from the inverter 201_1 is 50V, and the voltage of the regenerated power from the inverter 201_2 is 100V. For example, when the peripheral device 20_1 having the inverter 201_1 is selected by the selector 107, the voltage converter 106 sets the conversion magnification to 4 times based on the measured voltage of the regenerated power so that the voltage of the measured regenerated power matches the voltage of the power grid 102. The voltage converter 106 multiplies the set conversion magnification (4 times) by the voltage of the regenerated power from the inverter 201_1 (50V) to match the voltage of the measured regenerated power to the voltage of the power grid 102 (200V).

[0042] When the machining system 1 has only one peripheral device 20, the machine tool 10 does not need to include the selector 107. In this case, the inverter 201 is directly connected to the voltage measurement unit 109. Furthermore, the voltage converter 106 sets a conversion magnification based on the measured voltage of the regenerative power, and adjusts the voltage of the regenerative power to the voltage of the power grid based on the conversion magnification.

[0043] According to the machine tool 10 according to the fourth embodiment described above, the following effects are achieved.

[0044] Machine tool 10 further includes a voltage measuring unit 109 that measures the voltage of the regenerated power from peripheral device 20, and voltage converter 106 sets a conversion magnification based on the measured voltage of the regenerated power and the voltage of power grid 102, and adjusts the voltage of the regenerated power to the voltage of power grid 102 based on the conversion magnification. This allows regenerative energy from multiple peripheral devices to be utilized by the machine tool, and the power efficiency of the entire machining system can be improved.

[0045] <Fifth embodiment> 5 shows a machining system 1 according to a fifth embodiment of the present disclosure. Differences from the first to fourth embodiments will be mainly described.

[0046] The machine tool 10 includes a first voltage converter 106_1, a second voltage converter 106_2, a first selector 107_1, and a second selector 107_2. The first voltage converter 106_1 has a similar function to the voltage converter 106 of the first to fourth embodiments. The first selector 107_1 has a similar function to the selector 107 of the second to fourth embodiments.

[0047] The second voltage converter 106_2 is connected to the power supply circuit 101 and the second selector 107. The second voltage converter 106_2 is configured to obtain regenerative power generated by the machine tool 10 from the power supply circuit 101, convert it into a voltage for the inverter 201 of the peripheral device 20, and distribute the regenerative power to the peripheral device 20.

[0048] The second selector 107_2 is configured to select one of the inverters 201 from among the multiple inverters (201_1 and 201_2) and connect the selected inverter 201 to the second voltage converter 106_2. For example, the second selector 107_2 selects one of the inverters 201 from among the multiple inverters (201_1 and 201_2) in accordance with a command from a CNC device. Regenerative power from the second voltage converter 106_2 is distributed to the inverter 201 connected by the second selector 107_2.

[0049] In addition, when the machining system 1 has one peripheral device 20, the machine tool 10 does not need to include the first selector 107_1 and the second selector 107_2. In this case, the inverter 201 is directly connected to the first voltage converter 106_1. Furthermore, the inverter 201 is connected to the second voltage converter 106_2. In this case, the second voltage converter 106_2 is configured to obtain regenerative power generated by the machine tool 10 from the power supply circuit 101, convert it into a voltage for the inverter 201 of the peripheral device 20, and distribute the power to the peripheral device 20.

[0050] According to the machine tool 10 according to the fifth embodiment described above, the following effects are achieved.

[0051] Machine tool 10 further includes a second voltage converter 106_2 and a second selector 107_2 for distributing the regenerative power generated by machine tool 10 to peripheral device 20, and second selector 107_2 selects peripheral device 20 to which the regenerative power generated by machine tool 10 is distributed in accordance with a command from CNC device 105. This allows regenerative energy from multiple peripheral devices to be utilized by the machine tool, and at the same time, allows regenerative energy from the machine tool to be utilized by multiple peripheral devices, thereby improving the power efficiency of the entire machining system.

[0052] Sixth embodiment 6 shows a machining system 1 according to a sixth embodiment of the present disclosure. Differences from the first to fifth embodiments will be mainly described.

[0053] Machine tool 10 further includes a regenerative power measuring unit 110 connected to voltage converter 106. Regenerative power measuring unit 110 measures the regenerative power of inverter 201 from voltage converter 106. Regenerative power measuring unit 110 transmits regenerative power information including the value of the measured regenerative power to CNC device 105. CNC device 105 causes display unit 111 to display the regenerative power information.

[0054] According to the machine tool 10 according to the sixth embodiment described above, the following effects are achieved.

[0055] In the power regeneration method, since energy is returned directly to the power supply, it is difficult to measure the regenerative energy on the CNC device that controls the machine tool, and the effect of energy saving cannot be seen. In contrast, the machine tool 10 according to the sixth embodiment further includes a regenerative power measuring unit 110 that measures the regenerative power from the peripheral device 20, and the display unit 111 of the CNC device displays information on the measured regenerative power. This allows the value of the regenerative power to be visually grasped, and the effect of energy saving to be seen. Furthermore, the display of the regenerative power information allows the user to recognize abnormalities that may occur in the voltage converter 106, the inverter 201, etc. through the displayed regenerative power value, etc., and allows the user to quickly avoid dangers associated with the occurrence of such abnormalities.

[0056] <Other embodiments> Although the present disclosure has been described in detail, the present disclosure is not limited to the above-mentioned individual embodiments. Various additions, replacements, modifications, partial deletions, etc. are possible for these embodiments within the scope of the gist of the present disclosure, or within the scope of the gist of the present disclosure derived from the contents described in the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-mentioned embodiments, the order of each operation and the order of each process are shown as examples, and are not limited to these. The same applies when numerical values ​​or formulas are used in the description of the above-mentioned embodiments.

[0057] The following supplementary notes are further disclosed regarding the above embodiment.

[0058] (Appendix 1) A computer numerically controlled (CNC) device (105); An amplifier (103) for driving a motor (104); a power system (102) that supplies power to the amplifier (103) for driving the motor (104); a voltage converter (106) for adjusting the voltage of regenerative power of an inverter (201) that drives a peripheral device (20) that assists machining of the machine tool (10) to the voltage of the power system (102); A machine tool (10) comprising:

[0059] (Appendix 2) The above machine tool (10) is The system further includes a selector (107) that selects, in accordance with a command from the CNC device (105), which of a plurality of peripheral devices (20) the regenerative power from which is to be input to the voltage converter (106).

[0060] (Appendix 3) The above machine tool (10) is a selector (107) for selecting which of a plurality of peripheral devices (20) the regenerative power from which is to be input to the voltage converter (106); a plurality of voltage detection units (108) respectively associated with the plurality of peripheral devices (20); The selector (107) selects, to be input to the voltage converter (106), the regenerative power from the peripheral device (20) corresponding to the voltage detection unit (108) that detected the voltage among the plurality of voltage detection units (108).

[0061] (Appendix 4) The above machine tool (10) is A voltage measuring unit (109) for measuring a voltage of the regenerative power from the peripheral device (20), The voltage converter (106) sets a conversion magnification based on the measured voltage of the regenerative power and the voltage of the power grid (102), and adjusts the voltage of the regenerative power to the voltage of the power grid (102) based on the conversion magnification.

[0062] (Appendix 5) The above machine tool (10) is the power supply system further includes a second voltage converter (106) and a second selector (107_2) for distributing regenerative power generated by the machine tool (10) to the peripheral device (20); The second selector (107_2) selects a peripheral device (20) to which the regenerative power generated by the machine tool (10) is to be distributed, in accordance with a command from the CNC device (105).

[0063] (Appendix 6) The above machine tool (10) is A regenerative power measuring unit (110) for measuring regenerative power from the peripheral device (20), A display unit (111) of the CNC device (105) displays information about the measured regenerative power.

[0064] (Appendix 7) A computer numerically controlled (CNC) device (105); An amplifier (103) for driving a motor (104); a power system (102) that supplies power to the amplifier (103) for driving the motor (104); A peripheral device (20) that assists the machining of the machine tool (10); An inverter (201) for driving the peripheral device (20); a voltage converter (106) for adjusting the voltage of the regenerative power of the inverter (201) to the voltage of the power grid (102); A machining system (1). [Explanation of symbols]

[0065] 1. Crafting System 10 Machine tools 101 Power supply circuit 102 Power system 103 Amplifier 104 Motor 105 CNC equipment 106 Voltage Converter 107 Selector 108 Voltage detection section 109 Voltage measurement section 110 Regenerative power measurement unit 111 Display section 20 Peripheral Devices 201 Inverter 202 Motor 30 Power Line

Claims

1. A computer numerically controlled (CNC) device; An amplifier that drives the motor; a power system that supplies power to the amplifier for driving the motor; a voltage converter that adjusts the voltage of the regenerative power of an inverter that drives peripheral devices that assist the machining of the machine tool to the voltage of the power system; A machine tool comprising:

2. 2. The machine tool according to claim 1, further comprising a selector that selects, in accordance with a command from said CNC device, from which of a plurality of peripheral devices regenerative power is to be input to said voltage converter.

3. a selector that selects which of a plurality of peripheral devices the regenerative power from is to be input to the voltage converter; a plurality of voltage detection units respectively corresponding to the plurality of peripheral devices; 2. The machine tool according to claim 1, wherein the selector selects, to be input to the voltage converter, regenerative power from a peripheral device corresponding to a voltage detection unit that has detected a voltage among the plurality of voltage detection units.

4. A voltage measuring unit for measuring a voltage of the regenerative power from the peripheral device is further provided. The machine tool according to any one of claims 1 to 3, wherein the voltage converter sets a conversion magnification based on the measured voltage of the regenerative power and a voltage of the power grid, and adjusts the voltage of the regenerative power to the voltage of the power grid based on the conversion magnification.

5. a second voltage converter and a second selector for distributing regenerative power generated by the machine tool to the peripheral device; 4. The machine tool according to claim 2, wherein the second selector selects a peripheral device to which regenerative power generated by the machine tool is to be distributed in accordance with a command from the CNC device.

6. A regenerative power measuring unit for measuring regenerative power from the peripheral device is further provided, The machine tool according to any one of claims 1 to 3, wherein the display unit of the CNC device displays information on the measured regenerative power.

7. A computer numerically controlled (CNC) device; An amplifier that drives the motor; a power system that supplies power to the amplifier for driving the motor; Peripheral equipment to assist machine tool processing, an inverter for driving the peripheral device; a voltage converter that adjusts the voltage of the regenerative power of the inverter to the voltage of the power grid; A machining system comprising:

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