JP3496314B2 - Machining fluid circulation device for electric discharge machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining fluid circulating apparatus for an electric discharge machine, in which a table surface plate on which a workpiece is mounted is fixed and a head holding an electrode moves to perform electric discharge machining.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional machining fluid supply apparatus for an electric discharge machine, in which a so-called table surface plate on which a workpiece is loaded is fixed and a head holding an electrode moves to perform electric discharge machining. It is a schematic side view of a ram type die sinking electric discharge machine. The electric discharge machine main body 1 shows a die-sinking electric discharge machine, which has a table surface plate 3 mounted on a bed 2, and a machining tank 4 surrounding the table surface plate 3.
Are attached to the bed 2. A saddle 6 is provided above a column 5 slidably attached to the bed 2 in the X-axis direction, and a ram 7 is provided above the column 5 so as to be slidable in the Y-axis direction. . A head 9 is slidably arranged in the Z-axis direction on the left side of a head base 8 mounted on the ram 7, and an electrode mounting surface plate 10 is arranged at the tip of the head 9. Reference numeral 11 is an X-axis drive motor for moving the saddle 6 in the X-axis direction, 12 is a Y-axis drive motor for moving the ram 7 in the Y-axis direction, and 13 is a head 9 for Z.
It is a Z-axis drive motor that moves in the axial direction.

Reference numeral 14 is an electrode for die-sinking electric discharge machining mounted on the electrode mounting surface plate 10, and 15 is a work piece mounted on the table surface plate 3. Reference numeral 16 is a machining liquid supply device, and here, an example is shown in which it is arranged behind the electric discharge machining device body 1. Depending on the type of the electric discharge machine, the bed 2 and the table surface plate 3 may be integrally formed. Further, the bed 2, the table surface plate 3, the column 5, the saddle 6, the ram 7, the head base 8, the head 9, the electrode mounting surface plate 10 and the like are usually cast members, and these are formed into desired shapes, sizes, and precisions. It is used after being machined. In this case, the horizontal direction of the machine, that is, the direction perpendicular to the paper surface of FIG. 5, is the X-axis direction, the front-back direction of the machine, that is, the horizontal direction of the paper surface of FIG. It is in the axial direction.

FIG. 6 is a sectional view showing a structure only above the column 5 of the conventional electric discharge machine main body 1 shown in FIG. Reference numeral 17 denotes an X-axis direction linear guide, which includes an X-axis direction guide rail 18 provided on the upper surface of the column 5 and an X-axis direction guide nut 19 that is provided on the lower surface of the saddle 6 and holds the X-axis direction guide rail 18. To be done. Reference numeral 20 denotes a Y-axis direction linear guide, which, like the X-axis, has a Y-axis direction guide rail 21 provided on the upper surface of the saddle 6 and a Y provided on the lower surface of the ram 7.
It is configured with a Y-axis direction guide nut 22 that holds the axial guide rail 21. Reference numeral 23 denotes a Z-axis direction linear guide, which is provided on the side of the head 9 so that the Z-axis direction guide rail 2 is provided.
4 and the Z-axis direction guide rail 2 provided on the head base 8 side
4 and a Z-axis direction guide nut 25 that grips 4. In FIG. 6, the X-axis drive motor 11, Y
The illustration of the shaft driving motor 12 and the Z-axis driving motor 13 is omitted.

FIG. 7 is an external perspective view showing only the machining tank 4 of the conventional electric discharge machine main body 1 shown in FIG. The processing tank 4 is usually formed as a sheet metal part. Also, 2
6 is a processing tank front door that slides up and down, and 27 is a processing tank front door handle that locks the processing tank front door 26. The example of the front door 26 of the processing tank is shown in the figure, but it may be divided into upper and lower doors and may be two or more. Processing tank front handle 2
7 also shows a case of two left and right in the figure, but the processing tank front door 26
The number and the arrangement of the items vary depending on the size and the number of the items. 28 is a work piece 1 processed on the table surface plate 3.
5 is a T-slot groove that determines the position of 5.

Reference numeral 29 denotes a front door driving means housing portion for housing a driving means for sliding the processing tank front door 26 up and down. Reference numeral 30 denotes a machining fluid discharge / liquid level setting section including a machining fluid discharge section for discharging the machining fluid from the machining tank 4 and a liquid level setting section for setting the height of the liquid level of the machining fluid in the machining tank 4. Further, reference numeral 31 is a machining fluid control unit for controlling machining fluid discharge and liquid level setting, and a pressure gauge 32 and an electric discharge machine for controlling the pressure and flow rate of the machining fluid when jetting or suction machining is performed by electric discharge machining. A valve 33 or the like for injecting the working liquid is arranged at an inside position. 34 is a machining liquid supply port for supplying the machining liquid to the machining tank 4 before the electric discharge machining. Therefore, the processing tank 4 is mainly composed of a front door driving means storage portion 29, a processing liquid discharge / liquid level setting portion 30, a processing liquid control portion 31 and the like, in addition to a space for storing the processing liquid.

FIG. 8 is a plan view showing the structure of the machining tank 4 of the conventional electric discharge machine main body 1 shown in FIG. FIG. 9 is a development perspective view showing the structure of the machining liquid discharge / liquid level setting unit 30 of the machining tank 4 of the conventional electric discharge machine main body 1 shown in FIG. In particular, the figure shows a case where the bed 2 and the table surface plate 3 are integrally formed.

Reference numeral 35 is a partition plate which divides the inside of the processing tank 4 into a space for storing the processing liquid and a processing liquid discharge / liquid level setting section 30, which is provided with a liquid level setting window 36 and a processing liquid discharge window 37. There is. A liquid level setting shutter 38 is provided with a liquid level setting shutter guide rail 39 having an L-shaped cross section.
It is attached to the partition plate 35 so as to slide up and down.
Further, 40 is a liquid level setting knob attached to the liquid level setting shutter 38. 41 is a machining fluid discharge shutter,
Similar to the liquid level setting shutter 38, a machining liquid discharge shutter guide rail 42 having an L-shaped cross section allows
It is attached to the partition plate 35 so as to slide up and down.
Reference numeral 43 denotes a machining fluid discharge cylinder that drives the machining fluid discharge shutter 41 up and down. The upper and lower portions of the liquid level setting shutter 38 and the lower portion of the processing liquid discharge shutter 41 are bent to increase the strength.

Reference numeral 44 denotes a machining fluid discharge port for discharging the overflowing machining fluid, which is connected to the machining fluid supply device 16 via a machining fluid discharge pipe (not shown). Reference numeral 45 denotes a working liquid supply unit, and the working liquid supplied to this portion from the working liquid supply device 16 flows into the inside of the working tank 4 through the working liquid supply port 34.

FIG. 10 is a sectional view showing the structure of the machining fluid supply device 16 of the conventional electric discharge machine main body 1 shown in FIG. The inside of the working liquid supply device 16 is divided into a clean liquid tank 47 and a waste liquid tank 48 by a tank partition plate 46. Four
A machining liquid delivery pump 9 has a discharge port 50 connected to a machining liquid supply unit 45 provided in the machining tank 4. Also,
A filtration pump 51 is connected to a filtration device 52 in the clean liquid tank 47 by a pipe. Reference numeral 53 is a filtration pressure gauge for detecting the life of the filtration device 52 and the like. Note that FIG.
2 shows an example in which a cylindrical paper filter is used as the filtering device 52.

Next, the operation of the conventional electric discharge machine body 1
The operation will be described with reference to the drawings. 5 and 6, the saddle 6 is located above the column 5 and is a linear guide 1 in the X-axis direction.
7 and the X-axis drive motor 11 to move in the X-axis direction. The ram 7 moves on the saddle 6 in the Y-axis direction by the Y-axis direction linear guide 20 and the Y-axis drive motor 12. The head 9 and the electrode mounting surface plate 10 move in the Z-axis direction on the head base 8 attached to the ram 7 by the Z-axis direction linear guide 23 and the Z-axis drive motor 13.
On the other hand, the table surface plate 3 is fixed on the bed 2,
It never moves. Therefore, the work piece 15 mounted on the table surface plate 3 does not move, and the electrode mounting surface plate 1
The electrode 14 attached to 0 moves in the X-axis, Y-axis, and Z-axis directions. Then, the processing liquid is stored in the processing tank 4, and the electrode 1
Electrical discharge machining is performed between the workpiece 4 and the workpiece 15 via a machining fluid. Further, the machining waste generated by the electric discharge machining is removed by the machining fluid supply device 16.

In FIG. 7, when the electric discharge machining is performed, the machining liquid is stored in the space surrounded by the table surface plate 3, the machining tank 4, and the machining tank front door 26. The amount of the working liquid to be stored, that is, the liquid surface height can be arbitrarily set as described later. When performing jetting / suctioning, the machining liquid control unit 3
A pressure gauge 32 and a valve 33 arranged on the front surface of No. 1 control the pressure and flow rate of the working fluid jetted and sucked. Further, the workpiece 15 is fixed on the table surface plate 3 by utilizing the T slot groove 28. In addition, in order to improve workability when the work piece 15 is installed on the table surface plate 3 before the electric discharge machining or when the work piece 15 is removed after the electric discharge machining, in general, a machining tank front door is used. 26 will be opened and it will work. This opening / closing operation of the processing tank front door 26 is usually performed manually with the processing tank front door handle 27 by hand. The drive means for smoothly performing the opening / closing operation is housed in the front door drive means housing portion 29.

Next, a method of storing the working liquid in the working tank 4 at an arbitrary liquid level and discharging the working liquid from the working tank 5 will be described with reference to FIGS. 8 and 9. First, a method of storing the working fluid will be described. The liquid level setting knob 40 is manually pinched, and the liquid level setting shutter 38 that slides up and down is set to an arbitrary height. As will be described later, the working fluid is delivered from the working fluid supply device 16, and the working fluid is supplied to the inside of the working tank 4 through the working fluid supply part 45 and the working fluid supply port 34. The machining liquid is stored in the space surrounded by the table surface plate 3, the machining tank 4, the machining tank front door 26, and the partition plate 35, and the liquid level rises. Liquid level shutter 3
When reaching the upper end of 8, the machining fluid overflows into the machining fluid discharge / liquid level setting section 30 through the fluid level setting window 36. The overflowed machining fluid flows into the machining fluid discharge pipe (not shown) through the machining fluid discharge port 44 and is collected by the machining fluid supply device 16. In this way, the amount of the working liquid stored in the working tank 4, that is, the liquid level can be set arbitrarily.

When the machining fluid is discharged, the machining fluid discharge cylinder 43 pulls up the machining fluid discharge shutter 41 that slides up and down. By this operation, the machining fluid stored inside the machining tank 4 flows into the machining fluid discharge / liquid level setting unit 30 through the machining fluid discharge window 37. The machining fluid that has flowed in is the same as the machining fluid that overflowed from the liquid level setting window 36 described above, and the machining fluid discharge port 44.
Through a machining fluid discharge pipe (not shown) and is collected by the machining fluid supply device 16. In this way, the processing liquid stored inside the processing tank 4 can be discharged.

Next, the operation and operation of the working fluid supply device 16 will be described with reference to FIG. As described above, the processing liquid discharged from the processing tank 4 first flows into the waste liquid tank 48. The machining liquid generated in the electric discharge machining is mixed in the machining liquid in the waste liquid tank 48. Then, the filtration pump 51 sends it to the filtration device 52 to remove the processing waste. The processing liquid from which the processing waste has been removed is stored in the clean liquid tank 47. The life of the filtration device 52 is detected by the filtration pressure gauge 53. As described above, the clean machining liquid in the clean liquid tank 47 is discharged from the discharge port 50 by the machining liquid delivery pump 49, as described above.
5, and is supplied to the processing tank 4 via the processing liquid supply port 34.

[0016]

In the machining bath 4 of the machining fluid supply device 16 of the conventional electric discharge machining apparatus, as shown in FIG. 10, the machining fluid is supplied from the machining fluid supply device 16 to the machining bath 4. The supply side, that is, the processing liquid supply unit 45 and the processing liquid supply port 34, and the discharge side that discharges the processing liquid from the processing tank 4 to the processing liquid supply device 16, that is, the processing liquid discharge liquid level setting unit 30.
Further, the processing liquid discharge port 44 and the like are separately arranged on the left and right. Therefore, the manufacturing is complicated and the manufacturing cost is high. In addition, the operations for supplying and discharging the liquid when performing the electric discharge machining are complicated, and the workability is reduced.

Further, in the machining fluid supply device 16 of the conventional electric discharge machining apparatus, as shown in FIG. 10, the inside is separated into the clean fluid tank 47 and the waste fluid tank 48 by the tank partition plate 46, so that machining is performed. Although the volume of the machining fluid stored inside the fluid supply device 16 was large, generally, the machining fluid used for die-sinking EDM etc. is the fourth kind of dangerous materials
It is a dangerous substance corresponding to petroleum, and from the viewpoint of safety, it has been desired to reduce the working fluid stored in the working fluid supply device 16 as much as possible. Further, since the pumps are also provided with the processing liquid delivery pump 49 and the filtration pump 51, the manufacturing cost becomes high.

Therefore, the present invention has been made to solve the above problems, and has a simple structure, a low manufacturing cost, good workability during use, and a safe electric discharge machine. It is an object to provide a working fluid circulation device.

[0019]

A machining fluid circulating apparatus for an electrical discharge machine according to claim 1 stores a machining fluid for storing the machining fluid when performing the electrical discharge machining, and supplies the machining fluid to the machining vessel before machining. Outside the machining tank, the machining fluid supply port and the machining fluid supply / exhaust port, which are also provided as the machining fluid supply / exhaust port for discharging the machining fluid from the machining tank after machining, are connected to the machining fluid supply / exhaust port. And a machining fluid supply valve and a machining fluid discharge valve using a valve with a fully closed prevention mechanism .

Circulation of machining fluid for electric discharge machine according to claim 2
The device is a machining tank that stores machining fluid when performing electrical discharge machining.
And the processing liquid supply that supplies the processing liquid to the processing tank before processing
Processing fluid that discharges the processing fluid from the processing tank at the mouth and after processing
A machining fluid supply / discharge port that is also used as a discharge port;
It is connected to the machining fluid supply and discharge port and is installed outside the machining tank.
Machining fluid supply valve and machining fluid discharge bar using an bypass circuit
It has a lube.

Circulation of machining fluid for electric discharge machine according to claim 3
The device is a machining tank that stores machining fluid when performing electrical discharge machining.
And the processing liquid supply that supplies the processing liquid to the processing tank before processing
Processing fluid that discharges the processing fluid from the processing tank at the mouth and after processing
A machining fluid supply / discharge port that is also used as a discharge port;
It is connected to the processing liquid supply / discharge port and is installed outside the processing tank.
It has a working fluid supply valve and a working fluid discharge valve,
2 pipes on the discharge side of the machining fluid delivery pump connected to the machining tank
The above is installed in the main body of the electric discharge machine
Connects to the processing tank, and removes processing waste from the other through a constant flow valve
It is connected to a filtration device that operates .

[0022]

According to the first aspect of the present invention, a machining liquid is stored in the machining tank when the electric discharge machining is performed, the machining liquid is supplied to the machining tank before machining, and the machining liquid is supplied from the machining tank after machining. By providing a machining fluid supply / exhaust port arranged also as a machining fluid discharge port for discharging, by a machining fluid supply valve and a machining fluid discharge valve arranged outside the machining tank connected to the machining fluid supply / exhaust port, The supply of the working fluid or the discharge of the working fluid is switched. At this time, the machining liquid supply valve is fully closed.
Since it is a valve with a
Since it is not fully closed, the machining fluid supply is always interrupted.
There is no.

In the second aspect, when performing electric discharge machining
Processing tank that stores the processing liquid, the above processing tank before processing
From the processing liquid supply port for supplying liquid and the processing tank after processing
The processing liquid discharge port that discharges the processing liquid
A working fluid supply / exhaust port is provided and connected to the machining fluid supply / exhaust port.
Processing liquid supply valve and processing liquid arranged outside the processing tank
Supply of machining fluid or discharge of machining fluid by the discharge valve
Is switched. At this time, bypass the machining fluid supply valve
Since the circuit is installed, all of the machining liquid supply valve
Even if it is closed, the supply of the machining fluid is not always interrupted.

In the third aspect, when performing electric discharge machining
Processing tank that stores the processing liquid, the above processing tank before processing
From the processing liquid supply port for supplying liquid and the processing tank after processing
The processing liquid discharge port that discharges the processing liquid
A working fluid supply / exhaust port is provided and connected to the machining fluid supply / exhaust port.
Processing liquid supply valve and processing liquid arranged outside the processing tank
Supply of machining fluid or discharge of machining fluid by the discharge valve
Is switched. Then, the processing liquid is sent to the processing tank.
The discharge side piping of the delivery pump is branched into two systems and one is discharged
Connect to the processing tank installed in the main body of the processing machine and set the other
It is connected to the processing waste filtering device via a flow valve.
Therefore, one processing liquid delivery pump is used to supply the processing tank.
Supply and processing to the processing tank by supply and supply to the filtration device
Debris can be removed, and the filtration device turns into processing dust.
Therefore, even if clogging increases, the amount of supply to the filtration device
And the amount supplied to the processing tank does not change.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. Since the basic configuration of the entire machining fluid circulation device for an electric discharge machine is the same as that of the conventional machining fluid circulation device for an electric discharge machine shown in FIG. 5, a duplicate description will be omitted here.

FIG. 1 is a plan view showing a structure of a machining tank 4 of a main body 1 of an electric discharge machine in a machining fluid circulating apparatus for an electric discharge machine according to an embodiment of the present invention. This corresponds to FIG. In FIG. 1, reference numeral 56 designates a machining liquid supply port 34 for supplying the machining liquid to the machining tank 4 before machining and a machining liquid outlet 44 for discharging the machining liquid from the machining tank 4 after machining, which are used in the conventional example. A machining liquid supply / discharge port provided on the bottom surface of the tank 4 is a jetting prevention cover 57 for preventing the machining liquid from spouting from the machining liquid supply / discharge port 56 when the machining liquid is supplied. Reference numeral 58 is a liquid level setting unit having a function as the working liquid discharge / liquid level setting unit 30 of the conventional example. In addition, here, the machining fluid discharge port 4
4 functions as a discharge port for discharging only the overflowed machining fluid, and is connected to the machining fluid supply device 16 via a machining fluid discharge pipe (not shown) to return the overflowed machining fluid as in the conventional example. That is, in the present embodiment, since the machining liquid supply / discharge port 56 is arranged inside the partition plate 35 in the machining tank 4, the adjacent liquid level setting unit 5 is provided.
8 has a structure in which the liquid level setting function of the machining liquid is removed from the machining liquid discharge / liquid level setting unit 30 of the conventional example, and only the overflowed machining liquid is discharged.

FIG. 2 is a view showing the structure of the machining tank 4 of the electric discharge machine main body 1 in the machining fluid circulating apparatus for an electric discharge machine according to one embodiment of the present invention, taken along the line XX of FIG. 2 is a partial cross-sectional view of the processing tank 4 of FIG. 1 viewed from the right side, which is cut along the surface of the liquid level setting unit 58. Figure 2
In the above, reference numeral 59 denotes a machining fluid branch pipe connected to the machining fluid supply / discharge port 56, one of which is connected to a machining fluid supply valve 60 which opens and closes, and the other of which is connected to a machining fluid discharge valve 61 which opens and closes. ing. Processing liquid supply valve 60
Is connected to the discharge port 50 of the machining fluid delivery pump 49 of the machining fluid supply device 16 and receives the machining fluid supplied from there. Further, the machining fluid discharge valve 61 is also provided in the machining fluid supply device 16
It is connected to and discharges the working fluid from here.

Next, the electric discharge machine body 1 according to this embodiment
The action and operation of the processing tank 4 will be described with reference to FIGS. 1 and 2. First, before starting the electric discharge machining, the machining tank 4
The case of supplying the working liquid into the inside of the machine will be described. The machining fluid supply valve 60 is fully opened, the machining fluid discharge valve 61 is fully closed, and the machining fluid supply device 16 supplies the machining fluid to the machining fluid supply valve 60. The processing liquid is supplied to the processing tank 4 via the processing liquid supply valve 60, the processing liquid branch pipe 59, and the processing liquid supply / discharge port 56. At this time, the flow direction of the working liquid is changed by the spout prevention cover 57 so that the working liquid does not spout upward. Then, after the desired amount of the working fluid is supplied into the working tank 4, the working fluid supply valve 60 is closed. Here, the fact that the machining liquid supply valve 60 is closed does not directly enter the electric discharge machining work. When the electric discharge machining operation is directly started, the machining liquid supply valve 60 is not fully closed even after the machining liquid is filled in the machining tank 4 by a desired amount, and the machining liquid supply valve 60 is slightly opened.

In the present embodiment, when the working fluid is supplied into the working tank 4, the working fluid supply valve 60 is not fully closed even after the working fluid is filled in the working tank 4 by a desired amount.
It is in a slightly open state. That is, the machining fluid supply valve 6
If 0 has a structure that can be fully closed, it will be fully closed due to an operation error, and at this time, due to liquid leakage from the processing tank 4 (generally, it is very small, but it is difficult to make it zero). It is also assumed that the level of the working liquid inside the working tank 4 is lowered, and in the worst case, a fire may occur. Therefore, FIG.
In the above, as the machining liquid supply valve 60, a valve with a fully closed prevention mechanism is used. This is a valve that is commercially available under the name such as a valve with a memory stop plate, and it cannot be closed beyond a predetermined narrowing down. At this time, the narrowing down amount can be arbitrarily set by the memory stop plate. With this mechanism, it is possible to eliminate the risk of causing a fire by stopping the circulation of the machining fluid during electric discharge machining due to an operation error.

Next, a case where the machining liquid is discharged from the inside of the machining tank 4 after the electric discharge machining is completed will be described. Contrary to the above-described supply, the machining fluid supply valve 60 is fully closed and the machining fluid discharge valve 61 is fully opened. The machining fluid is discharged to the machining fluid supply device 16 through the machining fluid supply / discharge port 56, the machining fluid branch pipe 59, and the machining fluid discharge valve 60.

Next, the electric discharge machining process will be described. During the electric discharge machining, in order to prevent the generated machining scraps from being removed or to prevent the thermal deformation due to the temperature rise due to the heat generated by the machining to reduce the machining accuracy, the liquid level setting unit 58 is usually used.
The machining liquid level overflowing the liquid level setting window 36 is set in advance, and the machining liquid discharge port 44 for discharging only the overflowing machining liquid between the machining tank 4 and the machining liquid supply device 16 is not shown. The working fluid is circulated to the working fluid supply device 16 through the working fluid discharge pipe. The circulating amount of the machining liquid at this time may be smaller than that when it is supplied to the machining tank 4 before the electric discharge machining is started. However, when the circulation of the machining liquid is stopped, it is not possible to remove machining chips generated during the electric discharge machining and prevent deterioration of machining accuracy due to a temperature rise caused by machining, and the machining tank 4 is leaked from the machining tank 4. It is also necessary to assume that the level of the working fluid inside the machine will drop, and in the worst case, a fire will occur.

In the present embodiment, when the working fluid is supplied into the working tank 4, the working fluid supply valve 60 is not fully closed even after the working fluid is filled in the working tank 4 by a desired amount.
Just keep it slightly open. However, if the processing liquid supply valve 60 is configured to be fully closed, it may be fully closed due to an operation error, which may cause a fire. Therefore, in FIG. 2, a valve with a fully closed prevention mechanism is used as the machining liquid supply valve 60. This is a valve that is commercially available under the name such as a valve with a memory stop plate, and it cannot be closed beyond a predetermined narrowing down. At this time, the narrowing down amount can be arbitrarily set by the memory stop plate. With this mechanism, it is possible to eliminate the risk of causing a fire by stopping the circulation of the machining fluid during electric discharge machining due to an operation error. The machining liquid supply valve 60
The use of a valve with a fully closed prevention mechanism can be an embodiment corresponding to the claims.

In the embodiment shown in FIG. 2, a valve with a fully-closed prevention mechanism is used as the machining fluid supply valve 60. However, other configurations can eliminate the risk of fire during electric discharge machining due to operation mistakes. it can. FIG. 3 is a side view showing an embodiment of pipes near the machining fluid supply valve 60 and the machining fluid discharge valve 61 of the electric discharge machine body 1 in the machining fluid circulation device for an electric discharge machine of one embodiment of the present invention. Two
It corresponds to the drawing showing the piping near the machining liquid supply valve 60 and the machining liquid discharge valve 61. In particular, the components on the side of the processing tank 4 in FIG. 2 are omitted, and only the lower part from the processing liquid branch pipe 59 is shown. In the figure, 62 is a bypass circuit installed in the machining liquid supply valve 60, and this bypass circuit 62 is composed of a thin tube determined by the amount of machining liquid circulated during electric discharge machining. Processing liquid supply valve 60
By arranging the bypass circuit 62 in the bypass circuit 62, the fluid resistance of the bypass circuit 62 can be appropriately set, and similarly, even if the machining fluid supply valve 60 is fully closed, the circulation amount of the machining fluid is secured through the bypass circuit 62. It is possible to eliminate the possibility of fire due to operation mistake. In addition, disposing the bypass circuit 62 in the machining liquid supply valve 60
It can be an embodiment corresponding to the claims.

As described above, in the machining fluid circulating apparatus for the electric discharge machine of this embodiment, the basic constitution is that the machining tank 4 stores the machining fluid during the electric discharge machining and the machining tank 4 before machining. Connected to the machining fluid supply / exhaust port 56 and the machining fluid supply / exhaust port 56, which are also provided as a machining fluid supply port for supplying the machining fluid and a machining fluid outlet for discharging the machining fluid from the machining tank 4 after machining. it is intended to and a working fluid supply valve 60 and the working fluid discharge valve 61 is disposed in the outer machining tank 4.

Therefore, since the processing liquid supply / discharge port 56 for supplying the processing liquid to the inside of the processing tank 4 or discharging the processing liquid from the processing tank 4 is provided, the structure of the processing tank 4 is simplified. In addition, since the machining liquid supply valve 60 and the machining liquid discharge valve 61 connected to the machining liquid supply / discharge port 56 through the machining liquid distribution pipe 59 can be arranged close to each other, the operability can be improved. Furthermore, the structure of the liquid level setting unit 58 is also the same as that of the conventional machining liquid discharge / liquid level setting unit 30.
Therefore, the machining liquid discharge shutter 41, the machining liquid discharge shutter guide rail 42, the machining liquid discharge cylinder 43, and the like are removed, and the manufacturing cost can be reduced. Further, by using a valve with a fully-closed prevention mechanism for the machining liquid supply valve 60 or installing a bypass circuit 62, it is possible to prevent a fire from occurring due to an operation error,
The safety can be improved. The increase in manufacturing cost due to this is generally much smaller than the cost reduction due to the simple structure of the processing tank 4.

Next, the machining fluid supply device 16 of the machining fluid circulation device for an electric discharge machine according to the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of an essential part showing a structure of a machining fluid supply device 16 of an electric discharge machining apparatus body 1 in a machining fluid circulation device for an electric discharge machine according to an embodiment of the present invention.
It corresponds to 0. 63 is a machining fluid delivery pump 49
Is a branch connected to the discharge port 50, and 64 is a constant flow valve in which the flow rate is constant regardless of the pressure difference if the pressure difference between the inlet and the outlet is a certain value or more. Processing liquid delivery pump 4
The processing liquid sent from the discharge port 50 of 9 is branched into two systems by a branch 63, one is connected to the processing tank 4 and the other is connected to the filtration device 52 through the constant flow valve 64.
The machining liquid supply device 16 shown here does not have the tank partition plate 46 inside. That is, it is a one-tank type working liquid supply device which is not separated into a clean liquid tank 47 and a waste liquid tank 48. The machining fluid supply device 1 shown in FIG. 4 is of the one-tank type as described above. As a result, the volume of the machining fluid stored inside can be reduced as compared with the machining fluid supply device 16 of the conventional two-tank machining fluid circulating device for an electric discharge machine. Further, since the filtration pump 51 is also removed and only one machining liquid delivery pump 49 is equipped, the manufacturing cost can be reduced.

Here, a branch 63 is connected to the discharge port of the processing liquid delivery pump 49 to branch into two systems, one is connected to the processing tank 4 and the other is connected to the filtration device 52. In the working liquid supply device 16, the reason why the constant flow valve 64 is installed in the middle of the pipe to the filtration device 52 will be described.

Generally, the filtering device 52 has a small fluid resistance in the initial stage, and when the machining waste generated by the electric discharge machining is removed and trapped inside, the fluid resistance increases. Due to this phenomenon, the life of the filtration device 52 can be detected by the filtration pressure gauge 53. However, in the machining fluid supply device 16 shown in FIG. 4, unless the constant flow valve 64 is installed, when the fluid resistance of the filtration device 52 is small, the machining fluid delivered from the machining fluid delivery pump 49 to the filtration device 52. It is supplied, and only a small amount is supplied to the processing tank 4. Then, when the fluid resistance of the filtering device 52 increases, the fluid is also supplied to the processing tank 4. That is, depending on the magnitude of the fluid resistance of the filtration device 52, the machining fluid supply device 16
The amount of the processing liquid supplied from the processing tank to the processing tank 4 changes. In order to prevent this, a constant flow valve 64 is installed. Note that the set flow rate of the constant flow valve 64 is often the same as the flow rate of the working fluid flowing through the filtration device 52 at the end of its life.

In this embodiment, the machining fluid delivery pump 49 is used.
The discharge side pipe is branched into two systems, one of which is the electric discharge machine 1
It is connected to the processing tank 4 installed in the main body, and the other is a constant flow valve 6
It is connected to the filtering device 52 for removing the processing scraps via 4 and can be an embodiment corresponding to the claims. Therefore, even if the filtering device 52 removes the machining waste generated by the electric discharge machining and captures it inside, and the fluid resistance increases, the set flow rate of the constant flow valve 64 remains at the filtering device 52.
The flow rate of the working fluid flowing through the same is the same, and as a result, the amount of the working fluid supplied from the working fluid supply device 16 to the working tank 4 does not change. Therefore, even if clogging of the filtering device increases due to processing waste, the amount supplied to the filtering device and the amount supplied to the processing tank do not change. As described above, even if the machining fluid delivery pump 49 is provided as one, the supply to both is maintained, so that the manufacturing cost is low and a safe machining fluid circulating device for an electric discharge machine can be obtained.

The function of the constant flow valve 64 will be specifically described. The discharge capacity of the machining fluid delivery pump 49 is 200 L / mi.
n, the flow rate of the working fluid flowing through the filtration device 52 is 5 in the initial stage.
It is assumed that 0 L / min and 20 L / min at the time when the life is reached. If the constant flow valve 64 is not installed, the processing tank 4
The flow rate of the working fluid supplied to is from 150 L / min to 1
It changes up to 80 L / min. On the other hand, when the service life is reached, the flow rate of the machining fluid flowing to the filtration device 52 is equal to
When the constant flow valve 64 set to 0 L / min is installed,
Regardless of the state of the filtration device 52, 180 L / min of working liquid can be supplied to the working tank 4.

As described above, according to this embodiment, it is possible to improve the safety of the working fluid supply device 16 and reduce the manufacturing cost. 1 to 3, an example in which a manual ball valve is used as the machining liquid supply valve 60 and the machining liquid discharge valve 61 is shown, but if the flow of the machining liquid can be controlled, an electromagnetic It may be a valve or a pneumatically driven valve. Further, the machining fluid supply valve 60 and the machining fluid discharge valve 61 may be integrated by using a so-called three-way valve.

In particular, in the above-mentioned embodiment, the die-sinking electric discharge machine is described as an example, but the present invention can be applied to other kinds of electric discharge machine such as the wire cut electric discharge machine.

[0043]

As described above, the machining fluid circulating apparatus for an electric discharge machine according to claim 1 supplies the machining fluid to a machining tank which stores the machining fluid when performing the electric discharge machining, and supplies the machining fluid to the machining tank before machining. Outside the machining tank connected to the machining fluid supply / exhaust port, provided with the machining fluid supply / exhaust port that also serves as the machining fluid supply port and the machining fluid discharge port for discharging the machining fluid from the machining tank after machining. The machining fluid supply valve and the machining fluid discharge valve arranged in the above switch the machining fluid supply or the machining fluid discharge, so that the machining fluid can be supplied to or discharged from the machining tank. Since only one processing liquid supply / discharge port is required,
The structure of the machining tank is simplified, and the machining fluid supply valve connected to the machining fluid supply and discharge port and the machining fluid discharge valve can be arranged close to each other through the machining fluid distribution pipe, so the operability is also improved. You can Further, the manufacturing cost can be reduced by simplifying the structure.
In addition, the machining fluid supply valve according to claim 1 is provided with a fully closed prevention mechanism.
Since it is a valve, all of the machining fluid supply valve
It will not be closed and the supply of machining fluid will always be cut off.
There is no. Therefore, a safe machining fluid circulating device for EDM
Can be obtained.

In the second aspect, when performing electric discharge machining
Processing tank that stores the processing liquid, the above processing tank before processing
From the processing liquid supply port for supplying liquid and the processing tank after processing
The processing liquid discharge port that discharges the processing liquid
A working fluid supply / exhaust port is provided and connected to the machining fluid supply / exhaust port.
Processing liquid supply valve and processing liquid arranged outside the processing tank
Supply of machining fluid or discharge of machining fluid by the discharge valve
The working fluid is supplied to the processing tank.
There is only one processing liquid supply / exhaust port that discharges from the processing tank.
Since the structure of the processing tank is simple,
The processing fluid supply pipe is connected to the machining fluid supply / discharge port through the machining fluid distribution pipe.
Place the machining fluid supply valve and machining fluid discharge valve close to each other
Therefore, the operability can be improved.
Furthermore, the simplification of the structure reduces the manufacturing cost.
be able to. In addition, bypass the machining fluid supply valve.
Since the passage is installed, the machining fluid supply valve is fully closed.
However, the processing liquid supply is not always interrupted. Shi
Therefore, to obtain a safe machining fluid circulation device for electric discharge machines.
You can

In the third aspect, when performing electric discharge machining
Processing tank that stores the processing liquid, the above processing tank before processing
From the processing liquid supply port for supplying liquid and the processing tank after processing
The processing liquid discharge port that discharges the processing liquid
A working fluid supply / exhaust port is provided and connected to the machining fluid supply / exhaust port.
Processing liquid supply valve and processing liquid arranged outside the processing tank
The discharge valve, the discharge of the supply or working fluid of the working fluid
The working fluid is supplied to the processing tank.
There is only one processing liquid supply / exhaust port that discharges from the processing tank.
Since the structure of the processing tank is simple,
The processing fluid supply pipe is connected to the machining fluid supply / discharge port through the machining fluid distribution pipe.
Place the machining fluid supply valve and machining fluid discharge valve close to each other
Therefore, the operability can be improved.
Furthermore, the simplification of the structure reduces the manufacturing cost.
be able to. In addition, the processing liquid supply device is a single tank type
In addition, the piping on the discharge side of the machining fluid delivery pump is divided into two systems.
One of them is connected to the machining tank installed in the electric discharge machine body.
And connect the other side to the processing waste filter through a constant flow valve
By using one machining fluid delivery pump
Supply to the processing tank by supplying to the tank and to the filtration device.
It is possible to supply and remove processing waste, and moreover, the filtration device
Even if clogging increases due to processing waste,
The supply amount and the supply amount to the processing tank have not changed, and
It is possible to reduce the volume of machining fluid stored inside
Therefore, even if only one processing liquid delivery pump is used,
Since the supply of water and the supply to the filtration device are maintained,
Get a safe and safe machining fluid circulation device for EDM.
be able to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part showing a structure of a machining tank of an electric discharge machine in a machining fluid circulating apparatus for an electric discharge machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part taken along a cutting line XX in the view seen from the side showing the structure of the machining tank of the electric discharge machine in the machining fluid circulating apparatus for the electric discharge machine according to the embodiment of the present invention. Is.

FIG. 3 is a side view showing an example of piping around a machining fluid supply valve and a machining fluid discharge valve of an electric discharge machine in a machining fluid circulation apparatus for an electric discharge machine according to an embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing a structure of a machining fluid supply device in a machining fluid circulation device for an electric discharge machine according to an embodiment of the present invention.

FIG. 5 is a schematic side view of an electric discharge machine for explaining a conventional machining liquid supply apparatus for an electric discharge machine.

6 is a cross-sectional view showing a structure only above a column of the conventional electric discharge machine shown in FIG.

FIG. 7 is an external perspective view showing only a machining tank of the conventional electric discharge machine shown in FIG.

FIG. 8 is a plan view having a cross section of a main part showing the structure of a machining tank of the conventional electric discharge machine shown in FIG.

9 is an exploded perspective view showing the structure of a machining fluid discharge / fluid level setting unit of a machining tank of the conventional electric discharge machining apparatus shown in FIG.

10 is a cross-sectional view showing the structure of a machining fluid supply device of the conventional electric discharge machine shown in FIG.

[Explanation of symbols]

1 electric discharge machine, 4 machining tanks, 15 workpieces, 16
Processing liquid supply device, 34 Processing liquid supply port, 44 Processing liquid discharge port, 49 Processing liquid delivery pump, 50 Discharge port, 52
Filtration device, 56 machining fluid supply / exhaust port, 60 machining fluid supply valve, 61 machining fluid discharge valve, 62 bypass circuit, 63 branches, 64 constant flow valve.

Claims (3)

(57) [Claims] 1. A machining tank for storing a machining fluid during electric discharge machining, a machining fluid supply port for supplying the machining fluid to the machining tank before machining, and a machining fluid for discharging the machining fluid from the machining tank after machining. Machining fluid supply / exhaust port that also serves as an exhaust port, and machining fluid supply valve and machining using a valve with a fully closed prevention mechanism that is connected to the machining fluid supply / exhaust port and is disposed outside the machining tank. A machining fluid circulating device for an electric discharge machine, comprising a fluid discharge valve. 2. A machining liquid is stored when performing electric discharge machining.
Working tank and working fluid supply port that supplies working fluid to the working tank before processing
And discharging the machining fluid from the machining tank after machining
A machining fluid supply / discharge port that is also used as a port and a connection to the machining fluid supply / discharge port, which is disposed outside the machining tank.
Machining fluid supply valve and machining fluid discharge using a bypass circuit
Equipped with a discharge valve
Industrial fluid circulation device. 3. A processing liquid is stored when performing electric discharge machining.
Working tank and working fluid supply port that supplies working fluid to the working tank before processing
And discharging the machining fluid from the machining tank after machining
A machining fluid supply / discharge port that is also used as a port and a connection to the machining fluid supply / discharge port, which is disposed outside the machining tank.
Piping on the discharge side of the machining fluid delivery pump , which is equipped with a machining fluid supply valve and a machining fluid discharge valve, and is connected to the machining tank.
Was divided into two systems, and one was installed in the main body of the electric discharge machine.
Connected to the processing tank and the other through the constant flow valve to remove the processing waste.
A discharge device characterized by being connected to a filtering device for removal.
Machine fluid circulating device for machine tools.