JP2023167375A - Electric discharge machine - Google Patents

Abstract

To provide an electric discharge machine which comprises a service tank constituted to make a volumetric ratio of a contaminated liquid to a clarified liquid variable suitably in a simpler constitution.SOLUTION: An electric discharge machine 1 is provided which comprises: a service tank 3 including a working tank 2 housing a workpiece W, a contaminated liquid tank 31 reserving a working liquid discharged out of the working tank 2, a clarified liquid tank 33 reserving the working liquid fed from the anti-fouling tank 31, and a partition plate 35 partitioning the anti-fouling tank 31 from the clarified liquid tank 33 to have a first communication passage; a reservation bag 4 including a bag body 41 provided in the clarified liquid tank 33 to be expandable, and a connection port 42 being a bag mouth of the bag body 41 and connected to the first communication passage to communicate with the anti-fouling tank 31; a circulation pump pumping up the working liquid in the anti-fouling tank 31; a filter 52 filtering the working liquid fed by the circulation pump to feed it to the clarified liquid tank 33; and a liquid feeding pump 61 pumping up the working liquid in the clarified liquid tank 33 to feed it to the working tank 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric discharge machine.

In an electric discharge machine, a workpiece is placed in a machining tank, and a machining voltage is applied to the machining gap formed between a tool electrode (hereinafter simply referred to as the electrode) and a workpiece placed opposite the electrode. While generating an electric discharge, the electrode and the workpiece are moved relative to each other, and the workpiece is machined into a desired shape by the discharge energy.

Electric discharge machining is performed by dipping the machining gap in machining fluid or spraying machining fluid into the machining gap for the purpose of recovering insulation between the electrode and workpiece, cooling the workpiece, and removing machining debris. Inside, an insulating machining fluid is supplied to the machining gap.

The machining fluid is stored in a tank called a service tank. The service tank includes a dirty liquid tank that stores machining liquid containing machining waste, and a clean liquid tank that stores machining liquid from which machining waste has been removed.

Machining fluid containing machining debris generated by electrical discharge machining is discharged from the machining tank to the waste tank. The machining liquid stored in the dirty liquid tank has machining debris removed by a filter, and is sent to the clean liquid tank. The machining liquid stored in the fresh liquid tank is sent to the machining tank again and supplied to the machining gap. In this way, the machining fluid is kept clean while circulating within the device.

Depending on the operating status of the electric discharge machine, the water level and ratio of the machining fluid containing machining debris (hereinafter simply referred to as dirty fluid) and the machining fluid from which machining debris has been removed (hereinafter simply referred to as clear fluid) in the service tank vary. Generally, the dirty liquid tank and the clean liquid tank are designed to have sufficient capacity according to the maximum water level.

In order to make the service tank smaller, it is conceivable to configure the service tank so that the volume ratio of dirty liquid and clean liquid can be changed. Patent Document 1 discloses an electric discharge machine in which a partition plate that partitions a dirty liquid tank and a clean liquid tank is configured to be movable in the horizontal direction.

Japanese Patent Application Publication No. 04-122525

When configuring the service tank to be able to change the capacity ratio of dirty liquid and clean liquid, it is desirable to be able to change the capacity ratio with a simpler configuration. Further, it is desirable that the capacity ratio can be changed appropriately at any time depending on the actual storage ratio of dirty liquid and clean liquid in the service tank.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric discharge machine equipped with a service tank that has a simpler structure and is configured to be able to appropriately change the capacity ratio of dirty liquid and clean liquid. With the goal.

According to the present invention, there is provided a machining tank in which a workpiece is stored, a dirty liquid tank that stores the machining liquid discharged from the machining tank, a clean liquid tank that stores the machining liquid sent from the dirty liquid tank, and a dirty liquid tank that stores the machining liquid sent from the dirty liquid tank. a service tank including a partition plate that separates the liquid tank and the fresh liquid tank and has a first communication path; an inflatable bag provided in the fresh liquid tank; A storage bag that includes a connection port that is connected to the communication path and communicates with the sewage tank, a circulation pump that pumps up the machining fluid in the sewage tank, and a clean fluid tank that filters the machining fluid sent by the circulation pump. An electric discharge machine is provided, which includes a filter that sends the machining fluid to the machining tank, and a liquid pump that pumps up the machining fluid in the clear fluid tank and sends it to the machining tank.

In the electric discharge machine according to the present invention, a dirty liquid tank, a clean liquid tank, and a storage bag are provided as containers for storing machining liquid. The storage bag includes an inflatable bag body provided in the fresh liquid tank, and a connection port that is a bag opening of the bag body and communicates with the dirty liquid tank. The processing liquid supplied to the waste tank flows into the bag, and the bag expands. When the machining liquid is sent from the dirty liquid tank to the clean liquid tank, the water pressure of the machining liquid in the clean liquid tank is applied to the bag, causing the bag to contract and the machining liquid to flow out from the bag into the dirty liquid tank. In this way, the bag body expands and contracts automatically according to the actual storage ratio of dirty liquid and clean liquid, so the volume ratio of dirty liquid and clean liquid can be easily and appropriately changed. I can do it. Further, since the dirty liquid storage section that stores the dirty liquid is configured to include the dirty liquid tank and the storage bag, the dirty liquid tank can be configured to be smaller than the conventional one. As a result, the service tank can be downsized.

FIG. 1 is a side view showing a schematic configuration of an electric discharge machine according to the present embodiment. FIG. 2 is a top view showing a schematic configuration around the service tank. FIG. 3 is a circuit diagram showing a machining fluid supply and discharge route. Shows the state of liquid being drained after processing is completed. After finishing processing, it shows the state of completion of draining. This shows a state in which the machining fluid in the fresh fluid tank is at the lower limit of the liquid level during machining preparation. The communication shutter is shown in an open state during processing preparation. This shows the state in which liquid is being sent to the processing tank during preparation for processing. Indicates the status during processing.

Embodiments of the present invention will be described below with reference to the drawings. The various modified examples described below can be implemented in arbitrary combinations.

Although the electrical discharge machine 1 according to the present embodiment is a wire electrical discharge machine that uses a wire electrode E as an electrode, it may be another electrical discharge machine such as a die-sinking electrical discharge machine or a small-hole electrical discharge machine. . Further, in this embodiment, an aqueous machining fluid containing pure water as a main component is used as the machining fluid F, but other insulating fluids such as an oil-based machining fluid may be used.

As shown in FIGS. 1 to 3, the electrical discharge machine 1 of this embodiment includes a machining tank 2, a service tank 3, a storage bag 4, a circulation pipe 5 including a circulation pump 51 and a filter 52, It includes a liquid sending pipe line 6 including a liquid sending pump 61, a water purifier 62, and a cooler 63, and a jet pipe line 7 including a jet pump 71.

The machining tank 2 accommodates a workpiece W to be subjected to electrical discharge machining. The processing tank 2 is provided with an upper guide assembly 21 and a lower guide assembly 22 that face each other with the workpiece W interposed therebetween. The upper guide assembly 21 and the lower guide assembly 22 each spray machining fluid F toward the machining gap formed between the wire guide that guides the wire electrode E, the workpiece W, and the wire electrode E. It has a jet nozzle 23. The wire electrode E or the workpiece W is configured to be relatively movable, and the workpiece W is placed opposite the wire electrode E with a predetermined machining gap during electrical discharge machining. Machining voltages with different polarities are applied to the wire electrode E and the workpiece W from a power supply (not shown), and a part of the workpiece W is removed by electric discharge.

A processing tank liquid level sensor 26 is attached to the upper guide assembly 21, and the processing tank liquid level sensor 26 detects the upper limit PU of the liquid level of the processing tank 2. A drain for discharging the machining fluid F is provided at the lower part of the machining tank 2, and a drain shutter 24 configured to be openable and closable is provided to the drain. The drain shutter 24 is opened and closed by a drain shutter drive device 25, which is an arbitrary actuator such as an air cylinder. Although the drain shutter 24 may be replaced with a solenoid valve or the like to control the discharge of the machining fluid F from the machining tank 2, the drain shutter 24 is preferable because it is less likely to cause malfunctions due to machining debris.

The service tank 3 stores machining fluid F. The service tank 3 includes a dirty liquid tank 31, a clean liquid tank 33, and a partition plate 35. The waste liquid tank 31 stores the processing liquid F discharged from the processing tank 2. That is, the dirty liquid tank 31 basically stores dirty liquid. The sewage tank 31 is provided with a sewage tank liquid level sensor 32 that detects a lower limit DL of the liquid level of the machining fluid F in the sewage tank 31 . The clean liquid tank 33 stores the machining liquid F sent from the dirty liquid tank 31 through the filter 52. That is, the fresh liquid tank 33 stores fresh liquid. The fresh liquid tank 33 is provided with a fresh liquid tank liquid level sensor 34 that detects the lower limit CL of the liquid level of the machining fluid F in the fresh liquid tank 33 . The lower limit DL of the liquid level of the dirty liquid tank 31 is set higher than the lower limit CL of the liquid level of the clean liquid tank 33. When the clear liquid tank 33 detects the lower limit CL of the liquid level, the electric discharge machining and the driving of the circulation pump 51, the liquid feeding pump 61, and the jet pump 71 are stopped. At this time, a message prompting replenishment of the machining fluid F may be displayed on the display device of the control device or the like. The partition plate 35 is a plate-like member that separates the dirty liquid tank 31 and the clean liquid tank 33. The partition plate 35 has a first communication path 351 and a second communication path 352, which are openings that communicate with the dirty liquid tank 31 and the clean liquid tank 33.

The storage bag 4 includes a bag body 41 and a connection port 42. The bag body 41 is configured to be expandable and is provided within the fresh liquid tank 31. The bag body 42 only needs to have water impermeability to the extent that it can store the machining fluid F therein. That is, the bag body 42 is allowed to have some degree of water permeability as long as it can store the machining fluid F, and is not required to have complete water impermeability. The bag 41 may be made of any material as long as it fulfills its function; for example, high-density polyester taffeta may be used. The lower part of the bag 41 may be removably fixed to the service tank 3. For example, a hook may be provided at the tip of the bag 41 and the hook may be attached to a fixture provided in the fresh liquid tank 33 to fix the bag 41. Furthermore, a degassing valve may be provided in the upper part of the bag 41 in order to evacuate the air that has entered the bag 41. The connection port 42 is a bag opening of the bag body 41 and is connected to the first communication path 351. Processing fluid F flows in and out between the bag body 41 and the dirty fluid tank 31 through the connection port 42 . In order to properly inflow and outflow the machining fluid F, the first communication path 351 is preferably provided below the lower limit CL of the liquid level of the clear liquid tank 33.

According to the above configuration, the processing fluid F supplied to the dirty liquid tank 31 flows into the bag body 41 through the connection port 42, and the bag body 41 expands. Further, when the machining fluid F is sent from the dirty liquid tank 31 to the clean liquid tank 33, the water pressure of the machining fluid F in the clean liquid tank 33 is applied to the bag body 41, so the bag body 41 contracts, and the dirt is removed from the bag body 41. Processing liquid flows out into the liquid tank 31. In this way, the bag body 41 is automatically expanded and deflated according to the actual storage ratio of dirty liquid and clean liquid, so that the volume ratio of dirty liquid and clean liquid can be easily and appropriately changed. Ru.

Further, since most of the dirty liquid can be stored in the bag body 41, the dirty liquid tank 31 can be configured to be smaller than the conventional one. In order to make the waste liquid tank 31 smaller, it is preferable that the maximum capacity of the processing liquid F that can be stored in the storage bag 4 is approximately the same as the maximum capacity of the processing liquid F that can be stored in the processing tank 2. Specifically, the maximum capacity of the processing liquid F that can be stored in the storage bag 4 is preferably 90% or more and 150% or less of the maximum capacity of the processing liquid F that can be stored in the processing tank 2, and preferably 95% or more and 110% or less. % or less is more preferable. At this time, the waste tank 31 only needs to be small enough to allow installation of the circulation pump 51 and the waste tank liquid level sensor 32.

The second communication path 352 is provided with a communication shutter 36 configured to be openable and closable. The communication shutter 36 is opened and closed by a communication shutter drive device 37, which is an arbitrary actuator such as an air cylinder. By opening the communication shutter 36, the dirty liquid tank 31 and the clean liquid tank 33 communicate with each other.

Here, the supply and discharge route for the machining fluid F will be described in detail with reference to FIG. 3. In this embodiment, the machining fluid F is supplied and discharged through a circulation pipe 5, a liquid feeding pipe 6, a jet pipe 7, a first express pipe 8, and a second express pipe 9. and.

The circulation pipe 5 removes processing waste from the processing liquid F in the dirty liquid tank 31 and sends it to the clean liquid tank 33. The circulation pipe 5 includes a pipe connected to the dirty liquid tank 31 and the clean liquid tank, and a circulation pump 51, a filter 52, and a solenoid valve 53 provided in the pipe. The circulation pump 51 pumps up the processing liquid F in the waste liquid tank 31 and sends it to the filter 52. The filter 52 filters the machining fluid F sent by the circulation pump 51 and sends it to the clear fluid tank 33 . A plurality of filters 52 may be provided depending on the required filtration ability.

The liquid sending pipe line 6 sends the machining liquid F in the clear liquid tank 33 to the machining tank 2. The liquid sending pipe line 6 includes a pipe connected to the fresh liquid tank 33 and the processing tank 2, a liquid sending pump 61, and a solenoid valve 64 provided in the pipe. Further, the liquid sending pipe line 6 includes a water purifier 62, a solenoid valve 65, a pipe in which the deionizer 62 and the solenoid valve 65 are provided, a cooler 63, a solenoid valve 66, a cooler 63 and the solenoid valve. 66 is provided. The piping in which the water purifier 62 and the electromagnetic valve 65 are provided, and the piping in which the cooler 63 and the electromagnetic valve 66 are provided, are connected to the piping between the circulation pump 51 and the electromagnetic valve 64, respectively. The water deionizer 62 is, for example, an ion exchange device having an ion exchange resin, and maintains the specific resistance value of the processing fluid F at an appropriate value. Regarding the control of the water purifier 62, the electrical discharge machine 1 may be equipped with a resistivity meter. Note that if the machining fluid F is not a water-based machining fluid, the deionizer 62 is omitted. The cooler 63 maintains the temperature of the machining fluid F at an appropriate value.

The jet pipe line 7 sends the machining fluid F in the fresh liquid tank 33 to the jet nozzle 23 . The jet pipe line 7 includes a pipe connected to the fresh liquid tank 33 and the jet nozzle 23, a jet pump 71, and a solenoid valve 72 provided in the pipe.

The first express line 8 is connected to the circulation line 5. The first express pipeline 8 includes a pipe connected to the processing tank 2 and a pipe between the circulation pump 51 and the solenoid valve 53, and a solenoid valve 81 provided in the pipe. The piping of the first express pipeline 8 may be directly connected to the processing tank 2 or may merge with the liquid supply pipeline 6 . By controlling the electromagnetic valves 53 and 81, the liquid delivery destination of the circulation pump 51 can be switched to either the filter 52 or the first express pipe 8.

The second express line 9 is connected to the jet line 7 . The second express pipeline 9 includes a pipe connected to the processing tank 2 and a pipe between the jet pump 71 and the solenoid valve 72, and a solenoid valve 91 provided in the pipe. The pipe of the second express pipe line 9 may be directly connected to the processing tank 2, or may merge with the liquid feed pipe line 6. By controlling the electromagnetic valves 72 and 91, the liquid sending destination of the jet pump 71 can be switched to either the jet nozzle 23 or the second express pipe 9.

When filling the machining fluid F into the machining tank 2 during machining preparation, the first express conduit 8 and the second express conduit 9 are used in addition to the liquid conveyance conduit 6 to convey the machining fluid F. You may go.

The supply and discharge route for the machining fluid F described above is just an example, and is not limited thereto. Conduits other than those described above may be provided. For example, in a wire electrical discharge machine, a slide plate is provided to cover an opening through which a lower arm (not shown) passes through the machining tank 2, but a jet flow is supplied near the slide plate. A conduit may also be provided.

The circulation pump 51, the liquid pump 61, and the jet pump 71 may be collectively arranged on the back side of the electrical discharge machine 1, as shown in FIGS. 1 and 2. In this way, each pump can be easily accessed and maintainability is improved. Further, in this embodiment, the filter 52 is arranged on the service tank 3, but by arranging each pump collectively on the back side, the degree of freedom in the arrangement position of the filter 52 increases.

The electrical discharge machine 1 of this embodiment includes a control device (not shown). The control device is specifically a numerical control device, and is configured by arbitrarily combining hardware and software such as a CPU, RAM, ROM, auxiliary storage device, and input/output interface. The control device controls the drain shutter 24, the communication shutter 36, the circulation pump 51, the liquid feed pump 61, the jet pump 71, and the solenoid valves 53, 64, 65, 66, 72, 81, 91 regarding supply and discharge of the machining fluid F. I do.

Here, an example of a control method related to the supply and discharge of machining fluid F in the electrical discharge machine 1 described above will be described with reference to FIGS. 4 to 9. In each figure, the route drawn with a solid line indicates the route being used at that time. A route drawn with a broken line indicates a route that is not being used at that time. Routes written in dashed lines indicate routes that are used as necessary. In the following, the operation will be explained using an example of immersion machining in which the machining gap is immersed in machining fluid F to perform electric discharge machining, but the electric discharge machine 1 of this embodiment can perform various electric discharge machining operations. The method is implementable.

After the electric discharge machining on the workpiece W is completed, draining of liquid from the machining tank 2 to the service tank 3 is started. 3 and 4 show the state during draining. First, the drain shutter 24 is opened, and the dirty liquid is discharged from the processing tank 2 to the dirty liquid tank 31. The dirty liquid discharged into the dirty liquid tank 31 flows into the bag body 41 through the connection port 42, and the bag body 41 expands. The dirty liquid in the dirty liquid tank 31 is sent to the filter 52 by the circulation pump 51, and is supplied to the clean liquid tank 33 as a clean liquid from which processing waste has been removed.

Preferably, a deionizer 62 and a cooler 63 are used in parallel with the draining to maintain the specific resistance value and temperature of the processing fluid F at predetermined values. The liquid sending pump 61 is driven with the solenoid valve 64 closed and the solenoid valve 65 open, and the fresh liquid in the fresh liquid tank 33 passes through the deionizer 62 and then returns to the fresh liquid tank 33. The specific resistance value of the machining fluid F is maintained appropriately. In this embodiment, the solenoid valve 65 is opened and closed according to the specific resistance value of the machining fluid F during draining. When the solenoid valve 64 is closed and the solenoid valve 66 is open, the liquid sending pump 61 is driven, and the fresh liquid in the fresh liquid tank 33 passes through the cooler 63 and is returned to the fresh liquid tank 33, thereby processing. The temperature of liquid F is maintained appropriately. In this embodiment, the solenoid valve 66 is always open during draining.

Even after the draining of the machining tank 2 is completed, the purification of the machining fluid F is continued by the circulation pump 51 and the filter 52, and the specific resistance value and temperature are adjusted by the liquid feed pump 61, the water purifier 62, and the cooler 63. . As in the case of draining liquid, the deionizer 62 is used as needed, and the cooler 63 is used all the time. As the processing liquid F is purified, the amount of dirty liquid in the dirty liquid tank 31 and the bag body 41 decreases, and the amount of clean liquid in the clean liquid tank 33 increases. Along with this, the bag body 41 gradually contracts. FIG. 6 shows the state immediately after the liquid level in the dirty liquid tank 31 reaches the lower limit DL of the liquid level.

When it is detected that the liquid level in the dirty liquid tank 31 has reached the liquid level lower limit DL, the communication shutter 36 is opened. As shown in FIG. 7, the clean liquid in the clean liquid tank 33 flows into the dirty liquid tank 31 via the second communication path 352. After the communication shutter 36 is opened, the circulation pump 51 may remain driven, but in order to suppress energy consumption, it is preferable to stop the circulation pump 51 at an appropriate timing after the communication shutter 36 is opened.

In the example of this embodiment, after purification of the machining fluid F, the machining fluid F is sent to the machining tank 2 for the next machining, but if the next machining is not performed immediately, the machining fluid F should be purified. It is desirable to stop the electric discharge machine 1 when the process is completed. In other words, after performing electrical discharge machining, the machining fluid F is drained from the machining tank 2, and the circulation pump 51 is driven until the fluid level in the dirty fluid tank 31 reaches the lower limit DL of the fluid level. It is desirable to stop the electric discharge machine 1 after the cleaning of the electric discharge machine 1 is completed.

The machining fluid F is fed to the machining tank 2 while the clean fluid is stored in both the clean fluid tank 33 and the dirty fluid tank 31 . At this time, the machining fluid F is supplied to the machining tank 2 using the first express conduit 8 and the second express conduit 9 in addition to the liquid conduit 6 . As shown in FIG. 8, first, the drain shutter 24 of the processing tank 2 is closed. In the liquid feeding pipe line 6, the electromagnetic valve 64 is opened and the liquid feeding pump 61 is driven. It is preferable that the electromagnetic valves 65 and 66 be closed in order to rapidly transfer the liquid. In the circulation line 5 and the first express line 8, the circulation pump 51 is driven with the solenoid valve 53 closed and the solenoid valve 81 opened. In the jet pipe line 7 and the second express pipe line 9, the jet pump 71 is driven with the solenoid valve 72 closed and the solenoid valve 91 opened. When the liquid level of the machining tank 2 reaches the liquid level upper limit PU, it is determined that the machining tank 2 is full of water. After the water is filled, the solenoid valves 81 and 91 are closed, and the use of the first express pipe 8 and the second express pipe 9 is stopped.

By feeding the liquid using three pumps, the circulation pump 51, the liquid feeding pump 61, and the jet pump 71, the processing liquid F can be filled into the processing tank 2 more quickly. In this embodiment, the communication shutter 36 is controlled to be opened when the first express pipeline 8 is used. That is, by opening the communication shutter 36 after purifying the machining fluid F, the clean fluid is also stored in the dirty fluid tank 31, so the circulation pump 51 provided in the dirty fluid tank 31 is also used to send the fluid to the machining tank 2. can do.

After a sufficient amount of machining fluid F is supplied to the machining tank 2, electrical discharge machining is performed. FIG. 9 shows the state during processing. In the machining tank 2, the drain shutter 24 is opened and closed according to the detection signal of the machining tank liquid level sensor 26, so that the liquid level of the machining liquid F is maintained at the liquid level upper limit PU. In the circulation pipe 5, the processing liquid F in the dirty liquid tank 31 is pumped up by the circulation pump 51 and sent to the clean liquid tank 33 via the filter 52. In the liquid supply pipe line 6 , the processing liquid in the clear liquid tank 33 is pumped up by the liquid supply pump 61 and sent to the processing tank 2 . A part of the processing liquid pumped up by the liquid sending pump 61 is sent to a deionizer 62 or a cooler 63. During machining, the solenoid valve 65 is opened and closed according to the specific resistance value of the machining fluid F, and the water purifier 62 is used only when necessary. During processing, the solenoid valve 66 is always open and the cooler 63 is constantly used. In the jet pipe line 7 , the machining liquid in the clear liquid tank 33 is pumped up by the jet pump 71 and sent to the jet nozzle 23 . In this way, the machining fluid F circulates between the machining tank 2 and the service tank 3 while being purified.

During processing, the amount of machining fluid F sent from the dirty liquid tank 31 to the clean liquid tank 33 is configured to be larger than the amount of machining fluid F sent from the clean liquid tank 33 to the machining tank 2. That is, in this embodiment, regarding the machining fluid F, "(discharge amount of circulation pump 51)>(discharge amount of liquid feeding pump 61)-(return amount from water deionizer 62 and cooler 63)+(jet flow amount)" discharge amount of the pump 71).

At this time, the communication shutter 36 may be controlled to be always open during processing. When the amount of processing fluid F sent from the dirty liquid tank 31 to the clean liquid tank 33 is larger than the amount of processing fluid F sent from the clean liquid tank 33 to the processing tank 2, the processing liquid F is sent from the clean liquid tank 33 to the dirty liquid tank 31. A flow of machining fluid F is constantly formed. Therefore, even if the communication shutter 36 is always open, there is little possibility that the dirty liquid in the dirty liquid tank 31 will flow out into the clean liquid tank 33. In this way, the liquid levels in the dirty liquid tank 31 and the clean liquid tank 33 become the same, so that it is possible to prevent the processing liquid in the dirty liquid tank 31 from running out.

Alternatively, the communication shutter 36 may be controlled to be opened as necessary during processing. For example, the communication shutter 36 may be controlled to be opened for a predetermined period of time when the liquid level of the dirty liquid tank 31 reaches the lower limit DL of the liquid level. When the amount of machining fluid F sent from the dirty liquid tank 31 to the clean liquid tank 33 is larger than the amount of machining fluid F sent from the clean liquid tank 33 to the machining tank 2, the liquid level of the clean liquid tank 33 is Since the liquid level is higher than the liquid level in the dirty liquid tank 31, when the communication shutter 36 is opened, the clean liquid in the clean liquid tank 33 flows into the dirty liquid tank 31 due to water pressure. Even in this case, it is possible to prevent the machining liquid in the waste liquid tank 31 from running out.

As several examples have already been specifically shown, the present invention is not limited to the configuration of the embodiment shown in the drawings, and various modifications and applications are possible without departing from the technical idea of the present invention. It is.

1 Electric discharge machine 2 Machining tank 23 Jet nozzle 3 Service tank 31 Dirty liquid tank DL Liquid level lower limit 33 Clean liquid tank CL Liquid level lower limit 35 Partition plate 351 First communication path 352 Second communication path 36 Communication shutter 4 Storage bag 41 Bag body 42 Connection port 51 Circulation pump 52 Filter 61 Liquid pump 71 Jet pump 8 First express pipe 9 Second express pipe E Wire electrode F Processing fluid W Workpiece

Claims (8)

a processing tank in which the workpiece is accommodated;
A dirty liquid tank that stores the machining liquid discharged from the processing tank, a clean liquid tank that stores the machining liquid sent from the dirty liquid tank, and a first liquid tank that separates the dirty liquid tank and the clean liquid tank. a service tank including a partition plate having a communication passage;
a storage bag that includes an inflatable bag provided in the fresh liquid tank; and a connection port that is a bag opening of the bag and is connected to the first communication path and communicates with the dirty liquid tank;
a circulation pump that pumps up the processing liquid in the sewage tank;
a filter that filters the processing liquid sent by the circulation pump and sends it to the clear liquid tank;
An electrical discharge machine comprising: a liquid pump that pumps up the machining fluid in the fresh liquid tank and sends it to the machining tank. The partition plate further includes a second communication path that communicates with the dirty liquid tank and the clean liquid tank,
The electrical discharge machine according to claim 1, further comprising a communication shutter that opens and closes the second communication path. During processing, the amount of the processing liquid sent from the dirty liquid tank to the clean liquid tank is configured to be larger than the amount of processing liquid sent from the clean liquid tank to the processing tank,
The electric discharge machine according to claim 2, wherein the communication shutter is controlled to be opened during machining. further comprising a first express pipe for directly sending the machining liquid in the sewage tank to the machining tank by the circulation pump,
The circulation pump is configured to be able to select one of the filter and the first express pipe as a liquid delivery destination,
The electric discharge machine according to claim 2, wherein the communication shutter is controlled to be opened when the first express conduit is used. The lower limit of the liquid level of the dirty liquid tank is set higher than the lower limit of the liquid level of the clean liquid tank,
The electric discharge machine according to claim 1, wherein the first communication path is provided below the lower limit of the liquid level of the fresh liquid tank. The electric discharge machine according to claim 1, wherein a maximum capacity of the machining fluid that can be stored in the storage bag is 90% or more and 150% or less of a maximum capacity of the machining fluid that can be stored in the machining tank. a jet nozzle that spouts the machining fluid into a machining gap formed between the workpiece and the electrode;
The electrical discharge machine according to claim 1, further comprising a jet pump that pumps up the machining fluid in the fresh fluid tank and sends it to the jet nozzle. further comprising a second express pipe for directly sending the machining liquid in the fresh liquid tank to the machining tank by the jet pump,
8. The electrical discharge machine according to claim 7, wherein the jet pump is configured to be able to select one of the jet nozzle and the second express pipe as a liquid sending destination.

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