JPH05228735A - Machining liquid supply device for wire electric discharge machine - Google Patents

Abstract

(57) [Abstract] [Objective] To eliminate the waste of replacing the filter device before the end of its service life, and to obtain a machining fluid supply device for a wire electric discharge machine which can automatically replace the filter device during electric discharge machining. [Structure] At least two filter devices 28a, 28
b, liquid level detection means 37 for detecting the liquid level of the working liquid 13 in the clean liquid tank 22, the filtration pump 26, and the filter device 28.
switching means 41a, 41 provided between a and 28b for switching the machining liquid circuit based on the detection result of the liquid level detection means 37.
The one with b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine, and more particularly to a wire electric discharge machine which supplies a machining liquid to a machining part of the wire electric discharge machine and filters the machining liquid after machining. The present invention relates to a working fluid supply device.

[0002]

2. Description of the Related Art FIG. 14 is a block diagram of an example of a conventional wire electric discharge machine, in which 1 is an electric discharge machine and 20 is a machining fluid supply device. In the electric discharge machine 1, 2 is a bed, and a saddle 3 is arranged on the bed, and the saddle 3 is driven by a drive motor (not shown) to be in a vertical direction (Y direction) in the drawing.
To move to. Reference numeral 5 is a drive motor provided on the saddle 3, and 6 is a screw rod driven by the drive motor 5.

Reference numeral 4 is a table which is connected to a screw rod 6 and moves in the left-right direction (X direction) in the figure. A processing tank 7 is attached to the upper portion of the table, and a surface plate 8 is installed in the processing tank 7. Has been done. Reference numeral 9 is a workpiece mounted on the surface plate 8. Reference numeral 10 is an upper wire guide that supports the wire electrode 12 above the work piece 9, and 11 is a lower wire guide that supports the wire electrode 12 below the work piece 9.

In the processing liquid supply device 20, 21 is a main body of the processing liquid supply device 20 consisting of a clean liquid tank 22 and a waste liquid tank 23, and 25 is a supply pump provided on the main body 21. The stored working fluid 13 is transferred to the upper wire guide 10
And the pressure is fed to the working liquid supply hole of the lower wire guide 11.
Reference numeral 27 is a mount provided on the clean liquid tank 22 and on which a filter device 28 is installed. The filter device 28 is usually formed by a cylindrical inner filter 29 made of a fibrous material such as paper or cloth, an outer filter 30 arranged outside thereof, and a space between the filters 29, 30 and in the inner filter 29. Channel 3
1, 32, and the flow path 31 is connected to the filtration pump 26 via a connector 34 provided in the lower part thereof. Three
Reference numeral 5 denotes an inflow port for the waste liquid pumped from the waste liquid tank 23 by the filtration pump 26. Incidentally, 33 is a lid of the filter device 28, and 36 is a cover which is provided around the filter device 28 and which prevents scattering of the working liquid falling from the filter device 28.

In the wire electric discharge machine configured as described above, when the workpiece 9 is to be machined, the wire electrode 12 is stretched between the upper wire guide 10 and the lower wire guide 11 and fed. A voltage is applied between the workpiece 12 and the workpiece 9 while they are brought close to each other. That is,
The workpiece 9 is set to a positive potential and the wire electrode 12 is set to a negative potential, and a voltage is applied between the two to generate a discharge phenomenon in the machining gap, and the saddle 3 and the table 4 are moved in the XY directions by an NC device or the like. To perform wire electric discharge machining.

During this electric discharge machining, the feed pump 2 is provided in the machining section through the upper wire guide 10 and the lower wire guide 11.
5, the working liquid 13 stored in the clean liquid tank 22 is continuously supplied, and the working portion is immersed in the working liquid 13 to remove the working powder. The processing liquid 13 that has flowed out of the processing section together with the processing powder is collected in the processing tank 7 and sent to the waste liquid tank 23.

The processing liquid 13a (hereinafter referred to as "sewage") containing the processing powder stored in the wastewater tank 23 is filtered by the filtration pump 26.
Is continuously supplied to the filter device 28, flows into the flow path 31 from the waste liquid inflow port 35, rises in the flow path 31, and permeates the inner and outer filters 29, 30. Inner and outer filter 2
Working fluid 13 filtered by 9 and 30
Is a flow path 32 inside the inner filter 29 and the outer filter 3
It falls from the outside of 0 and is stored in the clean liquid tank 22 through the passage 24. At this time, the processed powder contained in the waste liquid 13a is not absorbed between the inner and outer filters 29, 30, and thus the flow path 31.
Accumulated at the bottom of.

When the flow rate of the waste liquid 13a passing through the filter device 28 during the electric discharge machining is small, that is, when the machining powder accumulated in the flow passage 31 between the inner and outer filters 29, 30 is large. Stops the processing, manually removes the cover 36 and the connector 34, and replaces the filter device 28 with a new one.

FIG. 15 shows another conventional example of the working liquid supply device 20, and in this example, the filter device 28 has a central portion where the flow path 3 is supplied with the waste liquid 13a from the waste liquid tank 23.
1a, and a cylindrical filter 30a is disposed on the outer periphery thereof, and its operation is almost the same as that of the conventional example described in FIG.

FIG. 16 shows still another conventional example of the processing liquid supply apparatus. In this example, a float 37 is provided in the waste liquid tank 23 to visually check the amount of the waste liquid 13a in the waste liquid tank 23. It is designed to be detected.

[0011]

Since the conventional machining fluid supply device shown in FIGS. 14 and 15 is constructed as described above, the electric discharge machining must be stopped when the filter device 28 is replaced. .. However, once the electric discharge machining is stopped and then restarted, it becomes a factor that deteriorates the machining accuracy. Therefore, it is necessary to replace the filter device 28 before the end of its service life in accordance with the machining time. Therefore, not only the workability is lowered, but also the cost is increased. Also,
Depending on the replacement cycle, the filter device 28 may have to be replaced during consecutive holidays, which makes continuous unmanned operation for a long period of time difficult.

Further, the flow paths 31, 3 of the filter device 28 are
1a, that is, the processing powder easily accumulates near the inflow port 35 of the waste liquid 13a, and the waste liquid 13a in the flow paths 31 and 31a is not discharged from the inflow port 35 that has clogged when the filter device 28 is replaced. 28 is very heavy and inconvenient to carry. Further, the processed powder accumulated during transportation is often discharged suddenly from the inflow port 35, and the clothes are often soiled.

Further, in the machining liquid supply apparatus shown in FIG. 16, the float 37 is inspected even though the waste liquid 13a is evaporated and the liquid level in the waste liquid tank 23 is lowered due to heat generated during processing. Since the liquid level is lowered from the dirty liquid suction port of the filtration pump 26, the filtration pump 26 may be in an idle state and the filtration pump 26 may fail. Furthermore, since some sludge that is not filtered is accumulated in the wastewater tank 23, the wastewater 13a in the wastewater tank 23 must be discharged periodically to remove the sludge, but it takes time for maintenance and inspection. It was a cause of increase in maintenance cost.

The present invention has been made to solve the above-mentioned problems, and eliminates the waste of replacing the filter device before the end of its life, and also allows the filter device to be automatically replaced during electric discharge machining. The purpose is to obtain a working fluid supply device for the device. Another object of the present invention is to obtain a working liquid supply device capable of smoothly discharging the dirty liquid accumulated in the filter device through the inlet when the filter device is replaced.

Still another object of the present invention is to reduce the idling state of the filtration pump as much as possible and to discharge a large amount of sludge accumulated in the waste tank at one time. The purpose of the present invention is to obtain a machining fluid supply device that can reduce the maintenance cost by reducing the number of maintenance inspections.

[0016]

A working fluid supply device for a wire electric discharge machining apparatus according to the present invention comprises: (1) at least two filter devices and a liquid level for detecting the working fluid level in a clean liquid tank. A detector provided with a detection means and a switching means provided between the filtration pump and the filter device for switching the working fluid circuit.

(2) Instead of the liquid level detection means, a flow rate detector for detecting the flow rate of the working fluid filtered by the filter device, or a pressure detector for detecting the pressure of the working fluid sent from the filtration pump to the filter device. It is equipped with a container.

(3) An opening is provided above the working fluid inlet of the filter device, and the opening is closed by a removable cap or sheet material.

(4) A liquid level detector for detecting at least the lower limit liquid level of the working liquid in the waste liquid tank, a movable partition plate arranged in the waste liquid tank, and a drive for driving the movable partition plate. Equipped with means.

(5) A liquid level detector for detecting at least the lower limit liquid level of the working liquid in the sewage tank, a controller for inputting this detection signal, and a movable partition plate arranged in the sewage tank. A driving means for driving the movable partition plate in response to a command from the controller, a bottom lid detachably closing the opening provided at the bottom of the waste tank, and a sludge tank detachably attached outside the opening. And an opening / closing means for discharging the processing liquid in the clean liquid tank. Further, the above-mentioned devices (4) and (5) are provided with a detection means for detecting the movement limit of the movable partition plate.

[0021]

[Function] During operation of the wire electric discharge machining device, one filter device accumulates machining powder and the amount of machining fluid passing therethrough decreases,
When the liquid level of the working liquid in the clean liquid tank is lowered, the liquid level detecting means detects it and automatically switches to the other unused filter device. Such switching of the filter device can also be performed by changing the flow rate of the working liquid filtered by the filter device or the pressure of the pressurized liquid sent from the filtration pump to the filter device.

When the filter device is replaced, the cap closing the opening is removed or the sheet material is broken, so that the atmosphere penetrates through the opening and the machining liquid accumulated inside is discharged.

When the machining fluid evaporates and decreases due to heat generation during machining, and the fluid level of the machining fluid in the waste tank decreases, the fluid level detector detects this and drives the drive means to move the movable partition. The plate is moved to reduce the volume of the sewage tank and raise the level of the working liquid to prevent the filtration pump from idling.

When sludge is accumulated in the sludge tank, the bottom lid is removed and the sludge tank is attached to the sludge tank, and the movable partition plate is moved to scrape the sludge accumulated in the bottom into the sludge tank. Then, after closing the opening of the sewage tank with the bottom lid, the sludge tank is removed and the accumulated sludge is discarded. During this time, the working liquid in the clean liquid tank is appropriately discharged through the opening / closing means. When the detecting means for detecting the movement limit is provided, when the movable partition plate hits this, the driving means is stopped and the movable partition plate is held at that position.

[0025]

【Example】

Example 1. FIG. 1 is a block diagram of the first embodiment of the present invention. The same parts as those in the conventional example of FIG. 14 are designated by the same reference numerals and the description thereof will be omitted. 27a is a first mounting base mounted on the main body 21 on the clean liquid tank 22 of the processing liquid supply device 20, 27b is also a second mounting base, both mounting bases 27a,
A first filter device 28a and a second filter device 28b are installed on 27b, respectively, and are covered with first and second covers 36a and 36b, respectively. A float switch 37 is supported by a mounting plate 38 in the clean liquid tank 22.

41a is a first solenoid valve, 41b is a second solenoid valve, the input side of which is connected to the output side of the filtration pump 26, and the output side of the first solenoid valve 41a is connected to the connector 34a. To the first filter device 28a, and the output side of the second solenoid valve 41b is connected to the second filter device 28b via a connector 34b. 42 is provided on the discharge side of the filtration pump 26,
It is a pressure gauge that displays the pressure inside the second filter devices 28a and 28b. 43 is a controller, which is a float switch 37
Output signal of the first and second electromagnetic valves 41a, 4
Control 1b.

Next, the operation of the first embodiment constructed as described above will be described with reference to FIGS. The electric discharge machining of the workpiece 9 in the electric discharge machine 1 is the same as that of the conventional one, and therefore the description thereof is omitted.

In FIG. 2, the first filter device 28a
Is operating and the second filter device is unused. Therefore, the first solenoid valve 41a is in the conducting state, the second solenoid valve 41b is in the non-conducting normal state, and the sewage liquid 13a containing the processed powder stored in the sewage bath 23 is not filtered by the filtration pump
6 through the first solenoid valve 41a and continuously sent to the first filter device 28a. First filter device 28a
The sewage liquid 13a sent to the tank collects the processing powder in the flow path, and only the pure processing liquid 13 passes through the filter device.
Stored in. Then, the processing liquid 13 is filled in the clean liquid tank 22, and the overflowed processing liquid 13 flows out to the waste liquid tank 23.

When the electric discharge machining further progresses and machining powder is accumulated in the first filter device 28a and the flow rate of the machining liquid 13 passing through the first filter device 28a decreases, as shown in FIG. The working liquid 13 in the tank 22 decreases, and the waste liquid 13a in the waste tank 23 increases. Then, if this state continues, the sewage liquid 13a overflows and flows into the clean liquid tank 22, and contaminates the working liquid 13.

In the present embodiment, it is shown that the discharge pressure of the filtration pump 26 rises before the above phenomenon occurs and the replacement time has come. Also, float switch 3
It is detected that the liquid level in the clean liquid tank 22 is lowered by 7, that is, the limit liquid level is reached, and its output signal is output to the controller 43.
Add to. Based on this, the controller 43 outputs an electric signal,
The first solenoid valve 41a is switched off and the second solenoid valve 41b is switched on so that the first filter device 28b causes the sewage 1
The filtration of 3a is stopped, and the filtration of the waste liquid 13a by the second filter device 28b is started.

Next, the first cover 36a and the connector 34a are manually removed, the filter device 28a is replaced with a new one, and the connector 34a is connected to the first cover 36a.
Install. Hereinafter, as described above, the first and second filter devices 28a and 28b are alternately exchanged to continuously perform electric discharge machining.

Example 2. 4 and 5 are explanatory views of the operation of the second embodiment of the present invention. In this embodiment, instead of the first float switch 37, first and second filter devices 28 are provided.
Processing fluid 1 which is filtered by a and 28b and flows out to the clean fluid tank 22.
Flow rate detectors 45a and 45b for detecting the flow rate of 3 are provided,
The detection signal is applied to the controller 43.

In the second embodiment configured as described above, when the processing powder is deposited in the first filter device 28a and the flow rate of the filtered processing liquid 13 decreases, the flow rate detector 45a detects this. The detected signal is sent to the controller 43, and when the flow rate is below a certain value, the controller 43
A control signal is sent to the second electromagnetic valves 41a and 41b to switch the first electromagnetic valve 41a to non-conductive and the second electromagnetic valve 41b to conductive. The following operation is similar to that of the first embodiment.

Example 3. In the first and second embodiments, an example is shown in which the first and second electromagnetic valves 41a and 41b are switched and controlled by the liquid level of the working liquid 13 in the clean liquid tank 22 or the flow rate of the filtered working liquid 13. However, the output signal of the pressure gauge 42 provided on the discharge side of the filtration pump 26 is applied to the controller 43, and the first and the second filter devices 28a and 28b increase the pressure due to the accumulation of the processed powder. Second solenoid valves 41a, 41b
May be switched.

Example 4. FIG. 6 is a block diagram of the fourth embodiment of the present invention. In this embodiment, the flow path 31 of the filter device 28 is used.
An opening 46 is provided at the top of a, and a detachable cap 47 is provided in the opening 46.

In this embodiment constructed as described above, the opening 46 of the flow passage 31a of the filter device 28 is closed by the cap 47 when the electric discharge machine 1 is in operation.
The waste liquid 13a sent from the waste liquid tank 23 is filtered. When replacing the filter device 28, the cover 36 is removed and the connector 34 is separated. However, in this state, since the processed powder is accumulated in the lower part of the flow path 31a, the waste liquid 13 in the flow path 31a is
a is not discharged from the inlet. Therefore, if the cap 47 is removed to open the opening 46 of the flow path 31a and the atmosphere is introduced into the flow path 46 from here, the waste liquid 13a accumulated in the flow path 31a is discharged from the waste water inlet 35. Can be discharged.

Example 5. FIG. 7 shows a fifth embodiment of the present invention. In this embodiment, a flange is provided around the opening 46 provided in the upper portion of the flow channel 31a of the filter device 28 so that the flow channel 31a is flanged from the inside. A sheet material 48 such as a synthetic resin sheet is attached to the above with an adhesive, and the opening 46
Is blocked.

In this embodiment constructed as described above, when the filter device 28 is replaced, if the sheet material 48 is broken, the atmosphere is introduced into the flow passage 31a and the waste liquid in the flow passage 31a is discharged. You can In the above description, the case where the fourth and fifth embodiments are implemented in the filter device 28 shown in FIGS. 6 and 7 has been described, but the filter device 28 having the configuration shown in FIG. The present invention can be applied to the filter device having the above configuration.

Example 6. FIG. 8 is a block diagram of the sixth embodiment of the present invention. The same parts as those in the conventional example described with reference to FIG. 16 are designated by the same reference numerals and the description thereof will be omitted. In the figure,
51 is a motor provided on the main body 21, 52 is a motor 5
It is a threaded rod which is rotationally driven to 1. Reference numeral 53 denotes a movable partition plate provided in the waste liquid tank 53, which is connected to the screw rod 52 and moves left and right in the waste liquid tank 23 in response to the rotation of the screw rod 52. 54 is a liquid level detector such as a float switch that detects the lower limit liquid level of the waste liquid tank 23, and 55 is a liquid level detector that also detects the upper limit liquid level. The output signals of both liquid level detectors 54, 55 are The output signal of the controller 56 is applied to the motor 51. 57 is a limit switch for detecting the minimum volume of the waste liquid tank 23, the output signal of which is the controller 5
Added to 6.

In the present embodiment constructed as described above,
When the effluent 13a in the effluent tank 23 decreases due to evaporation or the like and the liquid level decreases during the operation of the electric discharge machine 1, the lower limit liquid level detector 54 detects this and outputs its output signal to the controller 56. send. As a result, the controller 56 sends a signal to the motor 51 to drive it, thereby rotating the screw rod 52 and moving the movable partition plate 53 connected thereto to the right in the figure. This allows
The volume of the waste liquid tank 23 is reduced as shown in FIG.
Since the liquid level of 3a rises, 1
3a is supplied and does not idle. Raised sewage 1
When the upper limit liquid level detector 55 detects the liquid level of 3a or the limit switch 57 detects the movable partition plate 53, a signal is sent to the controller 56, and the motor 51 is stopped by a command from the controller 56. The movable partition plate 53 is held at that position.

Example 7. FIG. 10 is a block diagram of the seventh embodiment of the present invention. The same parts as those in the sixth embodiment are designated by the same reference numerals and the description thereof will be omitted. 59 is the main body 21
The bottom lid detachably attached to the opening 58 provided in the vicinity of the bottom of the clean fluid tank 22 is a sludge tank detachably attached to the outer periphery of the opening 58 outside the bottom of the main body 21. is there. Further, reference numeral 61 is a draining portion provided at the bottom of the clean liquid tank 22, and is provided with an electromagnetic valve 62 which opens and closes in response to a command from the controller 56.

In the present embodiment constructed as described above,
While the electric discharge machine 1 is moving, the bottom cover 59 is closed and the solenoid valve 62 is closed. Filter device 20 at this time
Is almost the same as that of the sixth embodiment, but the upper limit liquid level detector is omitted in this embodiment, and the movable partition plate 53 is omitted.
The stop position of is restricted by the limit switch 57.

When removing the sludge accumulated at the bottom of the sewage tank 23, the movable partition plate 53 is used as shown in FIG.
It is located at the left end of 3, and the bottom lid 59 is removed. At this time,
When the level of the waste liquid 13a in the waste liquid tank 23 is high, the filtration pump 26 is driven to send the waste liquid 13a to the filter device 28 for filtering, and the electromagnetic valve 62 is opened to open the inside of the clean liquid tank 22. The processing liquid 13 is discharged outside the tank.

Then, the motor 5 is instructed by the controller 56.
1. The screw rod 52 is driven to move the movable partition plate 53 connected to the screw rod 52 to the right as shown in FIG.
The sludge accumulated at the bottom of the sludge is scraped and accumulated in the sludge tank 60. During this time, the waste liquid 13a is sent to the filter device 28 by the filtration pump 26, and the filtered working liquid 13 is discharged into the clean liquid tank 2
2 is discharged via the solenoid valve 62. Movable partition plate 53
Moves to the right and contacts the limit switch 57,
The motor 57 is stopped by a command from the controller 56, and the solenoid valve 6
2 is closed. The state at this time is shown in FIG.

Then, as shown in FIG. 10, the opening 58 is closed by the bottom lid 59, and the sludge tank 60 is removed from the main body 21 as shown in FIG. 13 to discard the sludge accumulated therein.

The embodiments of the present invention have been described above.
The present invention is not limited to this, and the structure of the filter device and other parts can be appropriately changed.

[0047]

As is apparent from the above description, the present invention is provided with two or more filter devices, and when the filter function is deteriorated, the filter device is automatically switched to a new filter device. It is not necessary to stop the electric discharge machining at the time of replacement, and unmanned operation for a long time becomes possible, and the work efficiency can be improved. Moreover, since the filter device can be used up to the limit of the filter function, the life of the filter device can be extended and the cost can be reduced.

Further, according to the present invention, an opening is provided above the inflow port of the sewage, and the opening is closed by a removable cap or sealing material. When the filter device is replaced, the cap is removed or the sealing material is removed. The filter is crushed to allow air to flow in, and the wastewater is discharged from the wastewater inlet to reduce the weight of the filter device, which not only facilitates replacement work, but also suddenly discharges wastewater during transportation. There is no risk of soiling your clothes.

Further, when the amount of wastewater in the wastewater tank is reduced, the movable partition plate is moved to reduce the volume of the wastewater tank so as to raise the liquid level of the wastewater. Therefore, it is possible to prevent a failure.

Further, an opening having an openable / closable bottom lid is provided in the sewage tank, a sludge tank is detachably attached to the opening, and the movable partition plate is moved to move the sewage in the sewage tank. Since sludge is collected in the sludge tank, sludge can be removed extremely easily and in a short time, and the maintenance cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the first embodiment.

FIG. 3 is an explanatory view of the operation of the first embodiment.

FIG. 4 is a configuration diagram of a second embodiment of the present invention.

FIG. 5 is an explanatory view of the operation of the second embodiment.

FIG. 6 is a schematic diagram of a fourth embodiment of the present invention.

FIG. 7 is a schematic view of a main part of a fifth embodiment of the present invention.

FIG. 8 is a schematic diagram of a sixth embodiment of the present invention.

FIG. 9 is an operation explanatory view of the sixth embodiment.

FIG. 10 is a schematic diagram of the seventh embodiment of the present invention.

FIG. 11 is an explanatory view of the operation of the seventh embodiment.

FIG. 12 is an explanatory view of the operation of the seventh embodiment.

FIG. 13 is an explanatory view of the operation of the seventh embodiment.

FIG. 14 is a configuration diagram of an example of a conventional wire electric discharge machine.

FIG. 15 is a schematic view of an example of a machining fluid supply device in a conventional wire electric discharge machining device.

FIG. 16 is a schematic view of another example of the conventional wire electric discharge machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric discharge machine 13 Processing liquid 20 Processing liquid supply device 22 Clean liquid tank 23 Soil liquid tank 25 Supply pump 26 Filtration pump 27a, 27b Mounting base 28a, 28b Filter device 34a, 34b Connector 36a, 36b Cover 37, 54, 55 Liquid Surface detector 41a, 41b, 62 Solenoid valve 42 Pressure gauge 43, 56 Controller 45a, 45b Flow meter 46 Opening 47 Cap 48 Seal material 51 Motor 52 Screw rod 53 Movable partition plate 57 Limit switch 58 Opening 59 Bottom lid 60 Sludge tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location B23H 7/36 Z 9239-3C (72) Inventor Minohisa Kato 5th Kami, Higashioosone-cho, Kita-ku, Nagoya Address 1071 Mitsubishi Electric Engineering Co., Ltd., Nagoya Office

Claims (7)

[Claims] 1. A processing liquid stored in a clean liquid tank is supplied to a processing part of a workpiece, and the processing liquid in a waste liquid tank storing the processed liquid after processing is sent to a filter device by a filtration pump. In a machining fluid supply device for filtering and storing in the clean fluid tank for reuse, at least two filter devices for filtering the machining fluid after processing and a liquid level of the machining fluid in the clean fluid tank are detected. Machining of a wire electric discharge machine comprising liquid level detection means and switching means provided between the filtration pump and the filter device and switching the machining liquid circuit based on the detection result of the liquid level detection means. Liquid supply device. 2. The liquid level detecting means is replaced by a flow rate detecting means for detecting the flow rate of the working fluid filtered by a filter device and flowing out to the clean liquid tank, and the working fluid is detected based on the detection result of the flow rate detecting means. The machining fluid supply device for a wire electric discharge machine according to claim 1, further comprising switching means for switching circuits. 3. A switch for replacing the liquid level detecting means with a pressure detecting means for detecting the pressure of the working fluid sent from the filtration pump to the filter device, and switching the working fluid circuit based on the detection result of the pressure detecting means. The machining fluid supply device of the wire electric discharge machining apparatus according to claim 1, further comprising means. 4. The machining liquid stored in the clean liquid tank is supplied to the processing part of the workpiece, and the machining liquid in the waste liquid tank in which the machining liquid after machining is stored is sent to a filter device by a filtration pump. In a working fluid supply device that is filtered and stored in the clean fluid tank for reuse, an opening is provided above the working fluid inlet of the filter device, and the opening is closed with a removable cap or sheet material. A machining fluid supply device for a wire electric discharge machine. 5. The processing liquid stored in the clean liquid tank is supplied to the processing part of the workpiece, and the processing liquid in the waste liquid tank in which the processed liquid after processing is stored is sent to a filter device by a filtration pump. A processing liquid supply device for filtering and storing in the clean liquid tank for reuse, and a liquid level detector for detecting at least the lower limit liquid level of the processing liquid in the waste liquid tank, and arranged in the waste liquid tank. And a driving means for driving the movable partition plate based on the detection result of the liquid level detector. 6. The machining liquid stored in the clean liquid tank is supplied to the processing part of the workpiece, and the machining liquid in the waste liquid tank in which the machining liquid after machining is stored is sent to a filter device by a filtration pump. A processing liquid supply device for filtering and storing in the clean liquid tank for reuse, and a liquid level detector for detecting at least the lower limit liquid level of the processing liquid in the waste liquid tank, and detection by the liquid level detector. A controller for inputting a signal, a movable partition plate arranged in the waste liquid tank, a drive means for driving the movable partition plate according to a command from the controller, and a bottom portion of the waste liquid tank. A bottom lid that opens and closes the opening portion; a sludge tank that is detachably attached to the waste liquid tank outside the opening portion; and an opening and closing unit that discharges the processing liquid in the clean liquid tank. A machining fluid supply device for a characteristic wire electric discharge machine. 7. A machining fluid supply apparatus for a wire electric discharge machining apparatus according to claim 5 or 6, further comprising detection means for detecting a movement limit of the movable partition plate.