Wire electric discharge machining and method for controlling the same

Abstract

A wire electrical discharge machine (20) comprises: pumps (312, 314, 316, 318); a numerical value control device (212) including a pump control unit (620) that controls the pumps to drive the pumps when a power supply is in an ON state; a temperature acquisition unit (710) that acquires an environmental temperature (TP) or working fluid temperature (TP); and a power supply control unit (720) that switches the numerical value control device to the power supply ON state when the numerical value control device is in a power supply OFF state, and the temperature is lower than a predetermined temperature (STP).

Description

[Technical field]

[0001] The present invention relates to a wire electric discharge machine and a method for controlling the wire electric discharge machine. [Background technology]

[0002] Japanese Patent Application Laid-Open No. 2017-19046 discloses a machining fluid supply device for an electric discharge machine in which machining fluid is supplied by a pump provided in the machining fluid supply device. Summary of the Invention

[0003] According to the disclosure of JP 2017-19046 A, there is a problem in that the machining fluid may freeze while the control device of the machining fluid supply device is in a power-off state.

[0004] The present invention aims to solve the above-mentioned problems.

[0005] A first aspect of the present invention is a wire electric discharge machine that uses a wire electrode to machine a workpiece immersed in machining fluid, comprising: a pump that sucks in and expels the machining fluid; a numerical control device including a pump control unit that controls and drives the pump when the power is on; a temperature acquisition unit that acquires the temperature of the environment in which the wire electric discharge machine is installed or the temperature of the machining fluid; and a power supply control unit that switches the numerical control device to the power on state when the numerical control device is powered off and the temperature acquired by the temperature acquisition unit is lower than a predetermined temperature.

[0006] A second aspect of the present invention is a control method for a wire electric discharge machine that uses a wire electrode to machine a workpiece immersed in machining fluid, comprising: a pump control step of controlling and driving a pump that sucks in and expels the machining fluid when a numerical control device of the wire electric discharge machine is in a power-on state; a temperature acquisition step of acquiring the temperature of the environment in which the wire electric discharge machine is installed or the temperature of the machining fluid; and a first power control step of switching the numerical control device to the power-on state when the numerical control device is in a power-off state and the temperature acquired in the temperature acquisition step is lower than a predetermined temperature.

[0007] According to the present invention, it is possible to prevent the machining fluid from freezing while the numerical control device of the wire electric discharge machine is in a power-off state. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing the configuration of a wire electric discharge machine and peripheral devices according to one embodiment. [Diagram 2] FIG. 2 is a diagram illustrating an example of a change in the energization state of the numerical control device. [Diagram 3] FIG. 3 is a flowchart showing the energization control process of the numerical control device by the energization control device. [Figure 4] FIG. 4 is a flowchart showing a pump control process performed by the numerical control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] FIG. 1 is a diagram showing a configuration of a wire electric discharge machine 20 and peripheral devices in one embodiment. A machining fluid is supplied to the wire electric discharge machine 20 from a machining fluid supply device 30. The wire electric discharge machine 20 performs electric discharge machining on a workpiece WK immersed in a machining fluid LA using a wire electrode ET. The wire electric discharge machine 20 has a bed 204, a main body 206, a machining tank 210, a numerical control device 212, an electric current control device 214, an upper wire guide 232, a lower wire guide 234, and a machining fluid supply device 30. The electric current control device 214 controls the numerical control device 212 to set the numerical control device 212 to a power-on state or a power-off state. When the numerical control device 212 is in a power-on state, it can drive a plurality of pumps (described later) and a motor (not shown) of the machining fluid supply device 30. When the numerical control device 212 is in a power-off state, the pump and the motor are stopped. The numerical control device 212 and the energization control device 214 shown in FIG. 1 may be a physically integrated device.

[0010] A machining tank 210 is placed on the bed 204. The machining tank 210 stores machining liquid LA. The workpiece WK is placed in the machining tank 210 by a table (not shown). The upper wire guide 232 and the lower wire guide 234 are both attached to the main body 206. The upper wire guide 232 and the lower wire guide 234 are disposed above and below the workpiece WK, respectively. When the workpiece WK is placed, the upper wire guide 232 and the lower wire guide 234 support the wire electrode ET above and below the workpiece WK, respectively.

[0011] The machining fluid supply device 30 has a wastewater tank 302, a fresh water tank 304, and a plurality of pumps, which will be described later. The wastewater tank 302 stores wastewater DL. The wastewater DL is machining fluid containing machining debris (sludge) generated by machining the workpiece WK in the machining tank 210. The wastewater DL flows through a flow path (not shown) and is output from the machining tank 210 to the wastewater tank 302. The fresh water tank 304 stores fresh water CL. The fresh water CL is machining fluid obtained by removing machining debris contained in the wastewater DL with a filter FT. In other words, the filter FT changes the machining fluid from wastewater DL to fresh water CL.

[0012] The machining fluid supply device 30 has a plurality of pumps including a circulation pump 312, a water reservoir pump 314, a filter pump 316, and a machining fluid pump 318. The circulation pump 312 draws in the machining fluid (clean water CL) stored in the clean water tank 304 and discharges it into a flow path RA, thereby supplying the machining fluid to the temperature adjustment device 410. The temperature adjustment device 410 adjusts the temperature of the supplied machining fluid. The temperature adjustment device 410 adjusts the temperature of the machining fluid to a predetermined temperature by heating or cooling the machining fluid. The machining fluid whose temperature has been adjusted is collected from the temperature adjustment device 410 into the clean water tank 304. The circulation pump 312 further supplies the machining fluid to the ion exchange resin 420 by discharging the machining fluid (clean water CL) into a flow path RB. The ion exchange resin 420 reduces the electrical conductivity of the machining fluid. The machining fluid whose electrical conductivity has been reduced is collected from the ion exchange resin 420 into the clean water tank 304.

[0013] The water reservoir pump 314 sucks in machining fluid (dustwater DL) stored in the wastewater tank 302 and discharges it into the flow path RC, thereby supplying machining fluid to the machining tank 210. The water reservoir pump 314 may supply machining fluid to the machining tank 210 by sucking in machining fluid (clean water CL) stored in the clean water tank 304 instead of the wastewater tank 302 and discharging it into the flow path RC. The filter pump 316 sucks in machining fluid (dustwater DL) stored in the wastewater tank 302 and discharges it into the flow path RD, thereby supplying machining fluid to the filter FT. The filter FT removes machining debris contained in the machining fluid (dustwater DL). The machining fluid (clean water CL) from which the machining debris has been removed is stored in the clean water tank 304.

[0014] The machining fluid pump 318 sucks in machining fluid (clean water CL) stored in the clean water tank 304 and discharges it into the flow path RE. The machining fluid flowing through the flow path RE is separated by the manifold 430 into machining fluid flowing through the flow path REU and machining fluid flowing through the flow path REL. The flow path REU leads from the manifold 430 to the upper wire guide 232. The machining fluid supplied by the machining fluid pump 318 is sprayed from the upper wire guide 232 toward the workpiece WK when the workpiece WK is machined by the wire electric discharge machine 20 and when the wire electrode ET is connected. The flow path REL leads from the manifold 430 to the lower wire guide 234. The machining fluid supplied by the machining fluid pump 318 may be sprayed from the lower wire guide 234 toward the workpiece WK when the workpiece WK is machined by the wire electric discharge machine 20.

[0015] The numerical control device 212 has a processing circuit and a memory that stores a program. The processing circuit executes the program to function as the numerical control device 212 of this embodiment. The numerical control device 212 controls the multiple pumps of the machining fluid supply device 30 and the machining of the workpiece WK by the wire electric discharge machine 20. The memory includes a volatile memory such as a RAM, and a non-volatile memory such as a ROM and a flash memory. The processing circuit includes a processor such as a CPU.

[0016] The processing circuit of the numerical control device 212 executes a program, whereby the numerical control device 212 functions as a pump control unit 620 and a processing control unit 630. At least one of the pump control unit 620 and the processing control unit 630 may be realized by an ASIC, an FPGA, or another integrated circuit.

[0017] When the numerical control device 212 is in a power-on state, the pump control unit 620 can control and drive the multiple pumps of the machining liquid supply device 30 described above. When the numerical control device 212 is in a power-on state, the pump control unit 620 drives at least one pump among the circulation pump 312, the water reservoir pump 314, the filter pump 316, and the machining liquid pump 318. When the numerical control device 212 is in a power-on state, the machining control unit 630 can control machining of the workpiece WK by driving a motor (not shown) in accordance with a machining program.

[0018] The energization control device 214 has a processing circuit and a memory that stores a program. The processing circuit executes the program to function as the energization control device 214 of this embodiment. The energization control device 214 continues to operate with standby power even while the numerical control device 212 is in a power-off state. The energization control device 214 controls energization of the numerical control device 212 according to temperature or time, as will be described later. The memory includes a volatile memory such as a RAM, and a non-volatile memory such as a ROM and a flash memory. The processing circuit includes a processor such as a CPU.

[0019] The processing circuit of the energization control device 214 executes a program, causing the energization control device 214 to function as a temperature acquisition unit 710, a power supply control unit 720, and a timer unit 730. At least a portion of the temperature acquisition unit 710, the power supply control unit 720, and the timer unit 730 may be realized by an ASIC, an FPGA, or other integrated circuit.

[0020] Temperature acquisition unit 710 acquires the temperature of the environment in which wire electric discharge machine 20 is installed based on an output signal of temperature sensor 810 received via a network (not shown). Temperature sensor 810 is installed, for example, on bed 204 of wire electric discharge machine 20 or in its vicinity. Temperature sensor 810 may be installed outside wire electric discharge machine 20, in a room in which wire electric discharge machine 20 is installed. Temperature acquisition unit 710 may acquire the temperature of the machining fluid based on an output signal of temperature sensor 820 received via a network (not shown). Temperature sensor 820 is installed, for example, in machining fluid supply device 30. Temperature sensors 810 and 820 are sensors that detect temperature.

[0021] The power supply control unit 720 manages the power-on state of the numerical control device 212. The power-on state is the power-off state and the power-on state of the wire electric discharge machine 20. When the numerical control device 212 is in the power-off state and the temperature TP acquired by the temperature acquisition unit 710 is lower than the predetermined temperature STP, the power supply control unit 720 outputs a start signal to the numerical control device 212 to turn the numerical control device 212 into the power-on state. In this embodiment, the value of the predetermined temperature STP is the minimum temperature that can prevent the machining fluid from freezing. When the temperature TP is lower than the predetermined temperature STP, there is a risk that the machining fluid will freeze, so the power supply control unit 720 switches the numerical control device 212 from the power-off state to the power-on state. The power supply control unit 720 manages the power-on state of the numerical control device 212 by changing it from the power-off state to the power-on state.

[0022] The timekeeping unit 730 measures a first elapsed time TM1 from when the numerical control device 212 is switched from a power-off state to a power-on state by acquiring time information from a clock circuit or a timer circuit (not shown). When the first elapsed time TM1 reaches a first predetermined time PTM1, the power supply control unit 720 switches the numerical control device 212 from a power-on state to a power-off state. The power supply control unit 720 changes and manages the power supply state of the numerical control device 212 from a power-on state to a power-off state.

[0023] The timekeeping unit 730 measures a second elapsed time TM2 from when the numerical control device 212 is switched from a power-on state to a power-off state by acquiring time information from a clock circuit or a timer circuit (not shown). Until the second elapsed time TM2 reaches a second predetermined time PTM2, the power supply control unit 720 does not switch the numerical control device 212 from a power-off state to a power-on state even if the temperature TP acquired by the temperature acquisition unit 710 is lower than the predetermined temperature STP. When the second elapsed time TM2 reaches the second predetermined time PTM2, the power supply control unit 720 switches the numerical control device 212 from a power-off state to a power-on state. The power supply control unit 720 changes the power supply state of the numerical control device 212 from a power-off state to a power-on state and manages it.

[0024] The timing unit 730 may include a timing unit that measures the first elapsed time TM1 and a timing unit that measures the second elapsed time TM2. In this case, the numerical control device 212 may include a timing unit that measures the first elapsed time TM1.

[0025] 2 is a diagram illustrating an example of changes in the power supply state of the numerical control device 212. Graph 910 shows an example of how the temperature TP acquired by the temperature acquisition unit 710 changes with time. Graph 920 shows an example of how the power supply state of the numerical control device 212 changes with the temperature TP and time.

[0026] As shown in graph 920, at the initial time T0, the numerical control device 212 is in a power-off state. As shown in graph 910, the temperature TP decreases as time progresses from time T0. At time T1, the temperature TP falls below a predetermined temperature STP, so the numerical control device 212 is switched from a power-off state to a power-on state. The pump control unit 620 controls and drives, for example, the circulation pump 312 among the multiple pumps included in the machining fluid supply device 30. By circulating the machining fluid in this manner, freezing of the machining fluid is prevented. Furthermore, the machining fluid is heated by the temperature adjustment device 410, and the temperature of the machining fluid changes from a decrease to an increase. As the machining fluid supply device 30 starts to operate, the temperature of the environment in which the wire electric discharge machine 20 including the machining fluid supply device 30 is installed also changes from a decrease to an increase. That is, the temperature TP changes from a decrease to an increase.

[0027] When a first predetermined time PTM1 has elapsed from time T1 and the time reaches time T2, the numerical control device 212 switches from a power-on state to a power-off state. In the example (graph 910) shown in Fig. 2, the temperature TP is still lower than the predetermined temperature STP at time T2. Since the wire electric discharge machine 20 stops operating at time T2 and the circulation and heating of the machining fluid are stopped, the temperature TP starts to gradually decrease as time progresses from time T2.

[0028] Until the second predetermined time PTM2 has elapsed since time T2, the numerical control device 212 is not switched from the power-off state to the power-on state even if the temperature TP is lower than the predetermined temperature STP. At the point in time T3 when the second predetermined time PTM2 has elapsed and the temperature TP is lower than the predetermined temperature STP, the numerical control device 212 is switched from the power-off state to the power-on state again. This causes the temperature TP to start rising again.

[0029] When the first predetermined time PTM1 has elapsed from time T3 and the time reaches time T4, the numerical control device 212 is switched from the power-on state to the power-off state again. In the example (graph 910) shown in Fig. 2, the temperature TP is still lower than the predetermined temperature STP at time T4. Since the machining-liquid supply device 30 stops operating at time T4 and the circulation and heating of the machining-liquid are stopped, the temperature TP starts to gradually decrease as time progresses from time T4.

[0030] Until the second predetermined time PTM2 has elapsed from time T4, the numerical control device 212 is not switched from the power-off state to the power-on state even if the temperature TP is lower than the predetermined temperature STP. If the temperature TP is lower than the predetermined temperature STP at the time when the second predetermined time PTM2 has elapsed, the numerical control device 212 is switched from the power-off state to the power-on state again. This causes the temperature TP to start rising again. If the temperature TP is higher than the predetermined temperature STP at the time when the second predetermined time PTM2 has elapsed, the numerical control device 212 remains in the power-off state without being switched from the power-off state to the power-on state.

[0031] 3 is a flowchart showing the energization control process of the numerical control device 212 by the energization control device 214. This process is executed by the energization control device 214 repeatedly. When this process starts, in step S110, the power supply control unit 720 determines whether or not the numerical control device 212 is in a power-off state. If the result is YES in step S110, this process proceeds to step S112. If the result is NO in step S110, this process proceeds to step S150.

[0032] In step S112, the temperature acquisition unit 710 acquires the temperature TP. In step S114, the power supply control unit 720 determines whether the temperature TP acquired by the temperature acquisition unit 710 is lower than a predetermined temperature STP. If the result is YES in step S114, the process proceeds to step S116. If the result is NO in step S114, the machining fluid is unlikely to freeze, and therefore the process ends.

[0033] In step S116, the power supply control unit 720 determines whether or not the second elapsed time TM2 is being measured by the timer unit 730. If the result is YES in step S116, the process proceeds to step S180. If the result is NO in step S116, the process proceeds to step S118.

[0034] In step S118, the power supply control unit 720 switches the power supply to the ON state of the numerical control device 212. In step S120, the timing unit 730 starts measuring the first elapsed time TM1. When step S120 is completed, this process ends.

[0035] In step S150, the power supply control unit 720 determines whether the first elapsed time TM1 is being measured by the timer unit 730. If the result is YES in step S150, the process proceeds to step S152. If the result is NO in step S150, it is considered that the numerical control device 212 has been turned on by a manual operation by the user, and the process ends.

[0036] In step S152, the power supply control unit 720 determines whether the first elapsed time TM1 measured by the timer unit 730 is equal to or greater than the first predetermined time PTM1. If the result in step S152 is YES, the process proceeds to step S154. If the result in step S152 is NO, step S152 is repeated until the result in step S152 is YES.

[0037] In step S154, the timer 730 stops measuring the first elapsed time TM1. In step S156, the power supply control unit 720 switches the numerical control device 212 to a power-off state. In step S158, the timer 730 starts measuring the second elapsed time TM2. When step S158 is completed, this process ends.

[0038] In step S180, the power supply control unit 720 determines whether the second elapsed time TM2 measured by the timer unit 730 is equal to or greater than the second predetermined time PTM2. If the result in step S180 is YES, the process proceeds to step S182. If the result in step S180 is NO, the process ends.

[0039] In step S182, the timing unit 730 stops measuring the second elapsed time TM2. When step S182 is completed, the process proceeds to step S118 described above.

[0040] 4 is a flowchart showing a pump control process by the numerical controller 212. This process is executed by the numerical controller 212 when the numerical controller 212 is turned on. When this process is started, in step S254, the pump control unit 620 controls the circulation pump 312 to drive the circulation pump 312. By driving the circulation pump 312, the temperature of the machining liquid is maintained at a temperature at which the machining liquid does not freeze. The pump control unit 620 may drive a pump other than the circulation pump 312 in addition to or instead of the circulation pump 312. When the pump control unit 620 drives the machining liquid pump 318, the machining liquid supplied by the machining liquid pump 318 is sprayed toward a table (not shown) instead of the workpiece WK. At that time, the wire electrode ET does not need to be connected.

[0041] In step S256, the pump control unit 620 determines whether or not the power of the numerical control device 212 is switched to the off state. If the result in step S256 is YES, the process proceeds to step S258. If the result in step S256 is NO, the process returns to step S254.

[0042] In step S258, pump control section 620 stops pump drive control. When step S258 is completed, this process ends.

[0043] The present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

[0044] [Invention Obtained from the Embodiments] The invention that can be understood from the above-described embodiment will be described below.

[0045] (1) A wire electric discharge machine (20) for machining a workpiece (WK) immersed in machining fluid (LA, DL, CL) using a wire electrode (ET) includes a pump (312, 314, 316, 318) for sucking in and discharging the machining fluid, a numerical control device (212) including a pump control unit (620) for controlling and driving the pump when the power is on, a temperature acquisition unit (710) for acquiring the temperature (TP) of the environment in which the wire electric discharge machine is installed or the temperature (TP) of the machining fluid, and a power control unit (720) for switching the numerical control device to the power on state when the numerical control device is in the power off state and the temperature acquired by the temperature acquisition unit is lower than a predetermined temperature (STP). This makes it possible to prevent the machining fluid from freezing while the numerical control device is in the power off state.

[0046] (2) The pump may include a first pump (312) that supplies the machining liquid to a temperature regulator (410) that regulates the temperature of the machining liquid. This reduces the possibility that the numerical control device will be switched back to a power-on state to prevent the machining liquid from freezing shortly after returning to a power-off state.

[0047] (3) The pump may include a second pump (312) that supplies the machining fluid to an ion exchange resin (420) that reduces the electrical conductivity of the machining fluid, thereby more quickly preventing the machining fluid from freezing.

[0048] (4) The pump may include a third pump (314) for supplying the machining fluid to a machining tank (210) for storing the machining fluid in which the workpiece is immersed. This makes it possible to prevent the machining fluid stored in the machining tank from freezing.

[0049] (5) The pump may include a fourth pump (316) that supplies wastewater to a filter (FT) that changes the machining fluid from wastewater (DL) to fresh water (CL). This makes it possible to prevent the machining fluid stored in the wastewater tank and fresh water tank of the machining fluid supply device from freezing.

[0050] (6) The wire electric discharge machine may further include an upper wire guide (232) and a lower wire guide (234) that support the wire electrode above and below the workpiece, respectively, and the pump may include a fifth pump (318) that supplies the machining fluid sprayed from the upper wire guide toward the workpiece when the workpiece is machined by the wire electric discharge machine and when the wire electrode is connected. This makes it possible to prevent the machining fluid stored in the machining tank from freezing.

[0051] (7) The wire electric discharge machine may further include a timer (730) for measuring a first elapsed time (TM1) from when the power supply control unit switches the numerical control device to the power-on state, and when the first elapsed time reaches a first predetermined time (PTM1), the power supply control unit switches the numerical control device to the power-off state. This makes it possible to prevent the numerical control device from being maintained in the power-on state even though the possibility of the machining fluid freezing due to flowing through the flow path has decreased.

[0052] (8) The timer measures a second elapsed time (TM2) from when the power supply control unit switches the numerical control device to the power-off state, and the power supply control unit may not switch the numerical control device to the power-on state until the second elapsed time reaches a second predetermined time (PTM2) even if the temperature acquired by the temperature acquisition unit is lower than the predetermined temperature. This makes it possible to prevent the power supply state of the numerical control device from being frequently switched.

[0053] (9) A control method for a wire electric discharge machine (20) that uses a wire electrode (ET) to machine a workpiece (WK) immersed in machining fluid (LA, DL, CL) includes a pump control step of controlling and driving a pump that sucks in and expels the machining fluid when a numerical control device (212) for the wire electric discharge machine is in a power-on state, a temperature acquisition step of acquiring a temperature (TP) of the environment in which the wire electric discharge machine is installed or a temperature (TP) of the machining fluid, and a first power control step of switching the numerical control device to the power-on state when the numerical control device is in a power-off state and the temperature acquired in the temperature acquisition step is lower than a predetermined temperature (STP). This makes it possible to prevent the machining fluid from freezing while the numerical control device is in a power-off state.

[0054] (10) The control method for the wire electric discharge machine further includes a first timing step of measuring a first elapsed time (TM1) from when the numerical control device is switched to the power-on state in the first power control step, and a second power control step of switching the numerical control device to the power-off state when the first elapsed time reaches a first predetermined time (PTM1). This makes it possible to prevent the numerical control device from being maintained in the power-on state despite a reduced possibility of the machining fluid freezing due to the flow path.

[0055] (11) The method for controlling the wire electric discharge machine further includes a second timing step of measuring a second elapsed time (TM2) from when the numerical control device is switched to the power-off state in the second power control step, and in the first power control step, the numerical control device may not be switched to the power-on state until the second elapsed time reaches a second predetermined time (PTM2) even if the temperature acquired in the temperature acquisition step is lower than the predetermined temperature. This makes it possible to prevent the power-on state of the numerical control device from being frequently switched. [Explanation of symbols]

[0056] 20... Wire electric discharge machine 30... Machining fluid supply device 204...Bed 206...Body 210... Processing tank 212... Numerical control device 214...Electrical current control device 232...Upper wire guide 234...Lower wire guide 302...Sewage tank 304...Clean water tank 312...Circulation pump 314...Sump pump 316...Filter pump 318... Machining fluid pump 410... Temperature control device 420... Ion exchange resin 620... Pump control section 630... Processing control unit 710... Temperature acquisition unit 720... Power supply control unit 730... Timekeeping unit 810, 820...Temperature sensor 910, 920...Graph

Claims

1. A wire electric discharge machine that uses a wire electrode to machine an object immersed in a machining liquid, A pump that sucks in and expels the machining fluid; a numerical control device including a pump control unit that controls the pump to drive the pump when the power is on; a temperature acquisition unit that acquires a temperature of an environment in which the wire electric discharge machine is installed or a temperature of the machining fluid; a power supply control unit that switches the numerical control device to the power-on state when the numerical control device is in a power-off state and the temperature acquired by the temperature acquisition unit is lower than a predetermined temperature; Equipped with the pump includes a first pump that supplies the machining liquid to a temperature adjustment device that adjusts the temperature of the machining liquid; When the numerical control device is switched to the power-on state, the first pump is driven and the temperature adjustment device adjusts the temperature of the machining fluid.

2. 2. The wire electric discharge machine according to claim 1, The pump includes a second pump that supplies the machining fluid to an ion exchange resin for reducing electrical conductivity of the machining fluid.

3. 3. The wire electric discharge machine according to claim 1, The pump includes a third pump that supplies the machining fluid to a machining tank that stores the machining fluid in which the workpiece is immersed.

4. The wire electric discharge machine according to any one of claims 1 to 3, The pumps include a fourth pump that supplies the dirty water to a filter that changes the machining fluid from dirty water to clean water.

5. The wire electric discharge machine according to any one of claims 1 to 4, The wire electrode may further include an upper wire guide and a lower wire guide that support the wire electrode above and below the workpiece, respectively; The pump includes a fifth pump that supplies the machining fluid sprayed from the upper wire guide toward the workpiece when the workpiece is machined by the wire electric discharge machine and when the wire electrode is connected.

6. The wire electric discharge machine according to any one of claims 1 to 5, a timer unit configured to measure a first elapsed time from when the power supply control unit switches the numerical control device to the power-on state, When the first elapsed time reaches a first predetermined time, the power supply control unit switches the numerical control device to the power-off state.

7. 7. The wire electric discharge machine according to claim 6, the timer unit measures a second elapsed time from when the power supply control unit switches the numerical control device to the power-off state, The power supply control unit does not switch the numerical control device to the power on state until the second elapsed time reaches a second predetermined time, even if the temperature acquired by the temperature acquisition unit is lower than the predetermined temperature.

8. 1. A method for controlling a wire electric discharge machine that uses a wire electrode to machine an object immersed in a machining fluid, comprising: a pump control step of controlling and driving a pump that sucks in and expels the machining fluid when a numerical control device for the wire electric discharge machine is in a power-on state; a temperature acquisition step of acquiring a temperature of an environment in which the wire electric discharge machine is installed or a temperature of the machining fluid; a first power control step of switching the numerical control device to the power on state when the numerical control device is in a power off state and the temperature acquired in the temperature acquisition step is lower than a predetermined temperature; Including, the pump includes a first pump that supplies the machining liquid to a temperature adjustment device that adjusts the temperature of the machining liquid; When the numerical control device is switched to the power-on state, the first pump is driven and the temperature adjustment device adjusts the temperature of the machining fluid.

9. A method for controlling a wire electric discharge machine according to claim 8, comprising the steps of: a first time measurement step of measuring a first elapsed time from when the numerical control device is switched to the power-on state in the first power control step; a second power supply control step of switching the numerical control device to the power-off state when the first elapsed time reaches a first predetermined time; The method for controlling a wire electric discharge machine further comprises:

10. A method for controlling a wire electric discharge machine according to claim 9, comprising the steps of: a second timing step of measuring a second elapsed time from when the numerical control device is switched to the power-off state in the second power control step; Further comprising: a power supply control step of controlling a wire electric discharge machine, the power supply being turned on by the numerical control device, until the second elapsed time reaches a second predetermined time, even if the temperature acquired in the temperature acquisition step is lower than the predetermined temperature.

Images