JPH08118152A - Electric discharge machining device - Google Patents

Abstract

PURPOSE: To provide an electric discharge machining device that can obtain sufficient sealing performance. CONSTITUTION: An electric discharge machining device is provided with a saddle 10 supporting a machining tank 1 and movable in a right-angled direction to the longitudinal direction of the oblong hole 1a of the machining tank 1, a shielding body 401 disposed in such a way as to cover the oblong hole 1a of the machining tank 1 and held by the saddle 10, and an arm 3 passing with play through a hole provided in the shielding body 401 and inserted through the oblong hole 1a of the machining tank 1 so as to protrude into a machining solution to guide a wire. In this case, the shielding body fitting part of the saddle 10, and a machining tank supporting part on the saddle 10 are respectively provided with the reference faces 4, 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machine,
Particularly, the present invention relates to a machining tank sealing mechanism of a wire electric discharge machine and a machining liquid supply device of an electric discharge machine.

[0002]

2. Description of the Related Art A wire electric discharge machining apparatus for machining a workpiece by dipping it in a machining fluid in a machining tank is provided with a wire electrode that moves relative to the machining tank in the X and Y directions. An arm for holding the wire electrode penetrates the side surface of the processing tank and projects into the processing tank.

FIG. 13 shows the overall structure of a wire electric discharge machine equipped with a conventional machining tank sealing mechanism disclosed in Japanese Patent Application Laid-Open No. 2-106224. In FIG. 13, 1 is a processing tank, 2 is a processing liquid, 3 is an arm that penetrates the processing tank 1 and moves relative to the processing tank 1 in the XY directions, 1 a is disposed on the side surface of the processing tank 1, and an arm 3 is provided. And the processing tank 1 in one direction, for example X
Elongated holes that allow relative movement in the directions, 7 is a wire electrode, 8
Reference numeral a is an upper wire guide, 8b is a lower wire guide, 9 is a workpiece, 10 is a saddle, and 10a is a stopper integrated with the saddle. 401 is a long hole 1a on the side surface of the processing tank 1.
A shield provided on the outer side of the arm has a hole 401a through which the arm 3 freely penetrates, so that the arm 3 and the arm 3 can move relative to the processing tank 1 in the X direction shown in FIG. There is. Reference numeral 101 denotes a seal material attached around the long hole 1a of the processing tank 1, 103 denotes a bearing attached to the opposite side of the surface of the shield 401 in contact with the processing liquid 2, which is held together with the holding plate 104 fixed to the processing tank 1. Form the metal fitting 100,
The bearing 103 is fixed to the contact surface between the holding metal fitting 100 and the shield 401, and the shield 401 facilitates relative movement in the X direction with respect to the processing tank 1. 105 is a shield 4
This is a bearing that responds to the vertical movement of 01. 60
Reference numeral 1 denotes a bellows coaxial with the arm 3 and a shield 401 at the base.
Is fixed along the periphery of a hole 401a provided at the center of the arm, and the tip is fixed to the root of the arm 3.

When the processing liquid 2 is filled in the processing tank 1, water pressure is applied to the shield 401 in the Y direction, and a force that pushes the shield 401 away from the processing tank acts, but the long hole of the processing tank 1 The clearance 20 with the end face is regulated by the pressing plate 104 and the bearings 103 and 105 attached thereto so as not to become a minute gap or more, and is further sealed by the sealing material 101, so that the machining fluid 2 does not leak. Then, when the processing tank 1 moves in the X direction with respect to the arm, the sealing material 1 is provided between the shield 401 and the processing tank 1.
At 01, the shield 401 is supported by the bearings 103 and 105 and moves smoothly while preventing leakage of the machining liquid 2.
When the processing tank 1 moves relative to the arm 3 in the Y direction, the arm 3 moves to the hole 4 of the shield 401 as shown in FIG.
01a, which does not come into direct contact with the processing tank 1 and the expandable bellows 601 provided coaxially with the arm 3 leaks through the gap between the processing tank 1 and the hole 401a of the shield 401. Seals and enables relative movement. In addition, as shown in FIG.
2 is planted, and a ring 10b is provided above the supporting metal stopper 10a which is integral with the saddle 10 so that the pin 402 can be fitted to the ring 10b.
When the processing tank 1 moves in the X direction, the shield 40 by this
The relative movement of the first arm 3 in the X direction can be restricted. In addition, as another conventional example, an actual Kaihei 2-53323 is used.
The one disclosed in Japanese Patent Laid-Open Publication No. 2003-242242, that is, the sealing material has a two-stage structure including a sealing material having a circular cross section and a sealing material having a rectangular cross section.
There is one in which a sealing material having a step structure is inserted into a groove formed on a surface plate.

FIG. 15 is an overall schematic view showing a conventional electric discharge machine. In FIG. 15, 201 is a processing head, 202 is a processing electrode fixed to the processing head 201,
203 is a workpiece. 204 is usually a working fluid corresponding to Type 4 third petroleum under the Fire Service Law, and is filled between the working electrode 202 and the work piece 203 during processing. Reference numeral 205 denotes a processing tank for storing the processing liquid 204,
A bottom table 206 forms the bottom of the processing tank 205. 207 is a plane drive cross table on which the processing tank 205 is placed and moves in the horizontal direction, 208 is a cantilever arm that supports the processing head 201, 209 is a column that supports the cantilever arm 208, and 210 is a bed. In the figure, the bottom surface table 6 also serves as a plane drive cross table 7 in the Y-axis direction.

In FIG. 15, the machining head 201 is linearly moved in the Z-axis direction in the drawing on a slider guide (not shown) provided in the cantilever arm 208 by a driving device (not shown). The bottom table 206 and the plane intersecting table 207, on which the processing tank 205 is placed, are moved by a driving device in the plane direction, that is, in the Y axis direction and the X axis direction in the drawing.
That is, as shown in FIG. 15, in the conventional electric discharge machining apparatus, the machining electrode 202 side (machining head 201 side) moves in the vertical direction, and the work piece 203 side (machining tank 205 side) moves in the plane direction, and the machining position is changed. Take control. Processing tank 2 for processing
05 is filled with working fluid. Furthermore, during processing, processing tank 2
In order to always keep the working fluid 204 in 05 clean and at a constant temperature, an appropriate amount of working fluid 204 is constantly supplied from a working fluid supply port (not shown) in the working tank 205.

FIG. 17 is an overall external view of a conventional electric discharge machine. It should be noted that the same reference numerals and symbols are given to those having the same configurations or corresponding portions as those shown in FIG. 15 described above. In FIG. 17, reference numeral 211 is a working fluid tank for storing the working fluid, and 44 is a top lid of the working fluid tank. Reference numeral 212 denotes a machining liquid supply pump that supplies the machining liquid 204 to the machining tank 205, and is supported by being suspended from the machining liquid tank upper surface lid 44. 223 is a data display unit, and 224 is a machine operation unit. 225 is a machine operation panel including a data display section 223 and a machine operation section 224. Reference numeral 228 is a machining fluid discharge pipe for discharging the machining fluid 204 from the machining tank 205 to the machining fluid tank 211, and 229 is a machining fluid supply pipe for supplying the machining fluid 204 from the machining fluid tank 211 to the machining tank 205. Reference numeral 39 denotes a working liquid constant supply pipe branched from the working liquid supply pipe 229, the inner diameter of which is smaller than that of the working liquid supply pipe, and the flow rate of the working liquid 204 is also small. Reference numeral 38 denotes a valve provided at a branch point between the working liquid supply pipe 229 and the working liquid constant supply pipe 39. In general, a die-sinking electric discharge machine is a machine body including a machining head 201, a machining tank 205, a bed 210, and the like, which is shown as 237 in FIG.
And a machining power supply / drive control device 241 including a machining power supply (not shown) and a drive control device (not shown).
It can be divided into three parts of a processing liquid supply device including a processing liquid tank 211, a processing liquid supply pump 212 and the like. Reference numeral 30 is a wiring duct that protects electrical wiring between the machine body 237 and the machining power supply / drive control device 240.

In FIG. 17, the working fluid 204 is normally stored in the working fluid tank 211, and is supplied into the working tank 205 by the working fluid pump 212 according to a program or button operation. At this time, the processing liquid supply pipe 22
9 and the valve 38 provided at the branch point of the working liquid constant supply pipe 39 are fully opened, and the amount of the working liquid 204 supplied to the working tank 205 is maximized. When the machining liquid level sensor 42 provided in the machining tank 205 senses that the machining fluid 204 is filled in the machining tank 205, the valve 38 is opened only on the machining fluid always supply pipe 39 side, and is generated by machining. The machining fluid is removed by keeping the machining fluid 204 clean.
A small amount of machining fluid 204 is provided in the machining fluid tank 211 to keep the temperature of the machining fluid constant (not shown).
And is supplied and circulated to the processing tank 205 through a processing liquid temperature control device (not shown). Further, various processing data are read from the data display screen 223 fixed on the processing power source, and various commands and programs are input from the machine operation unit 225 adjacent to the data display screen 223.

FIG. 16 is an explanatory view of a machining fluid tank of a conventional electric discharge machine. It should be noted that the same reference numerals and symbols are given to those having the same configurations or corresponding portions as those shown in FIGS. 15 and 17 described above. In FIG. 16, reference numeral 215 denotes the working fluid 204, that is, the working fluid dead water portion in a range in which the working fluid supply pump 212 cannot suck.
Reference numeral 216 is a machining liquid supply pump discharge unit for discharging the machining liquid 204 sucked from the machining liquid tank by the machining liquid pump, and is generally connected to the machining tank 205. Reference numeral 217 is a working fluid filter for filtering the working fluid or passing through the catalyst to impart desired properties to the working fluid 204. Reference numeral 44 is a top lid of the processing liquid tank 211. Reference numeral 45 denotes a bottom surface of the machining fluid supply pump which is the lowest surface of the machining fluid supply pump 212.

In FIG. 16, the machining fluid supply pump 212 normally operates the machining fluid 204 in the machining fluid tank 211 (FIG. 1) by a program or button operation.
5 (see FIG. 17), the machining fluid 204 near the bottom surface 45 of the machining fluid supply pump is sucked, and the machining fluid supply pump discharge part 216 connected to the machining fluid supply port in the machining tank.
Discharge more. Further, the machining fluid discharged from the machining tank is temporarily stored in a waste fluid tank (not shown) in the machining fluid tank, and is processed by a filter pump (not shown).
Sent to. In this way, the processing liquid 204, which has been filtered through the processing liquid filter 217 to remove impurities and cleaned, is stored in the processing tank.

[0011]

In the conventional wire electric discharge machine shown in FIGS. 13 and 14 as described above, the method of supporting and guiding the shield 401 is the support metal stopper 1
0a, ring 10b, pin 402, bearing 103,
There are problems that it is complicated because it is composed of 15 members such as 105 and the pressing plate 104, assembly is difficult, and cost is high. Further, when the processing tank 1 and the shield 401 move relative to each other, the gap between the processing tank 1 and the shield 401 cannot always be kept constant, and the sealing property is not sufficient.

Further, in the one disclosed in Japanese Utility Model Laid-Open No. 2-53323, the sealing material having a circular cross section which comes into contact with the shield is buried in the sealing material having a rectangular cross section, so that sufficient sealing performance can be obtained. could not.

The conventional machining fluid tank shown in FIGS. 15 to 17 is constructed as described above, and when the machining fluid is supplied to the machining tank, the machining fluid dead water portion is large, and some adverse effects appear. Normally, the intake of the machining fluid supply pump is provided near the bottom of the machining fluid supply pump, so the bottom surface of the machining fluid supply pump is made of punch metal or wire mesh, and the mechanical strength is not large. Float to a position slightly higher than the tank bottom plate to avoid interference with the working liquid tank bottom plate. In addition, since the machining fluid supply pump generally sucks the machining fluid from near the bottom of the machining fluid supply pump, only the machining fluid at a position several tens of millimeters higher than the bottom surface of the machining fluid supply pump is affected by the vortex flow of the machining fluid generated during suction. I can't breathe. Due to the above-mentioned factors, the working fluid dead water part generally extends over 40 mm or more from the working fluid tank bottom plate. Here, for example, length 1500 mm, width 1000 mm,
If a machining fluid tank having a height of 400 mm is manufactured in the conventional manner, the capacity is about 600 mm liter. At this time, if the range of the working fluid dead water part is 50 mm higher than the working fluid tank bottom plate, the working fluid dead water portion has a liquid volume of 75 liters, which is 12.5% of the total volume, and the effective working fluid volume is 525 liters. Become. As described above, since the amount of the working fluid dead water increases, the amount of working fluid required for the working fluid tank unnecessarily increases. Generally, the machining fluid used in the electric discharge machining equipment corresponds to the Type 4 Petroleum No. 3 in the Fire Defense Law, and it is necessary to have firefighting procedures and facilities according to the volume of the fluid. Sometimes increased. Further, the working fluid needs to be replaced within a certain period of time, and the running cost has increased as the required working fluid amount increases.

The present invention has been made in order to solve the above problems, and an object thereof is to provide an electric discharge machine capable of obtaining a sufficient sealing property.

Another object of the present invention is to provide an electric discharge machining apparatus which requires less machining liquid for the machining tank volume.

[0016]

DISCLOSURE OF THE INVENTION An electric discharge machining apparatus according to the present invention includes a machining tank which stores a machining fluid and has a long hole formed in a horizontal direction in one plane, and which is movable in the longitudinal direction of the long hole. A saddle that supports the processing tank and is movable in a direction perpendicular to the longitudinal direction of the elongated hole, a shield that is arranged so as to cover the elongated hole of the processing tank and is held by the saddle, and the shield. An arm for penetrating a hole provided in the machining tank, inserting an elongated hole in the machining tank, projecting into the machining liquid, and guiding the wire; and a periphery of the hole of the shield provided coaxially with the arm and an arm mounting portion. The bellows are connected to each other and expand and contract in response to the expansion and contraction of the arm, and a seal member arranged around the long hole of the processing tank, and a saddle shield mounting portion and a processing tank on the saddle. The support portion is provided with a reference surface for each.

Further, the electric discharge machining apparatus according to the present invention has a long hole which stores a working liquid and is formed in a horizontal direction in one plane, and which is movable in the longitudinal direction of the long hole, and the machining tank. A saddle that supports and is movable in a direction perpendicular to the longitudinal direction of the long hole, and is disposed so as to cover the long hole of the processing tank,
A shield held by the saddle, an arm for penetrating through a hole provided in the shield and penetrating through a long hole of the machining tank to project into a machining fluid to guide a wire, and provided coaxially with the arm. A bellows which connects between the periphery of the hole of the shield and the arm attachment portion and expands and contracts in response to expansion and contraction of the arm, and an elastic body in a groove arranged around the long hole of the processing tank. With a sealing material provided through, the cross-sectional shape of the sealing material, the side in contact with the shield is circular,
The side in contact with the elastic body has a square shape.

Also, the electric discharge machining apparatus according to the present invention has a long hole which stores a working liquid and is formed in a horizontal direction in one plane, and which is movable in the longitudinal direction of the long hole, and the machining tank. A saddle that supports and is movable in a direction perpendicular to the longitudinal direction of the long hole, and is disposed so as to cover the long hole of the processing tank,
A shield held by the saddle, an arm for penetrating through a hole provided in the shield and penetrating through a long hole of the machining tank to project into a machining fluid to guide a wire, and provided coaxially with the arm. A bellows which connects between the periphery of the hole of the shield and the arm attachment portion and expands and contracts in response to expansion and contraction of the arm, and an elastic body in a groove arranged around the long hole of the processing tank. And a cover having a U-shaped cross section interposed between the seal and the elastic body in such a direction as to include the elastic body.

Further, in the electric discharge machining apparatus according to the present invention, a machining liquid supply pump is installed at the lower side bottom of a machining liquid tank having a bottom shape having two or more steps or slopes having a height difference or a combination of steps and slopes. To do.

[0020]

According to the present invention, the mounting portion of each moving shaft, the processing tank, and the mounting portion of the shield are regulated by the reference surface so that the processing tank and the shield can be moved even when the processing tank moves relative to the shield. The gap between and is always constant, and stable sealing is possible.

Further, in the present invention, since the contact area of the sealing material on the elastic body side is increased, the sealing material is not buried in the elastic body and stable sealing is possible.

Further, in the present invention, since the cover is interposed between the sealing material and the elastic body, the sealing material is not buried in the elastic body, and stable sealing is possible.

Since the amount of the working fluid dead water in the working fluid tank is reduced, the working fluid in the working fluid tank is used without waste,
The amount of processing liquid required is reduced.

[0024]

【Example】

Example 1. 1 is a side sectional view showing an overall configuration of a first embodiment of the present invention, FIG. 2 is a plan sectional view of an essential part, and FIG. 3 is a left front view of FIG. Since 1 to 10, 101, and 120 are the same as the conventional device, description thereof will be omitted. The shield 401 is the direct saddle 10
The shield 4 is supported only by this support.
The gap between 01 and the processing tank 1 is regulated. Further, the bellows 601 is provided coaxially with the arm 3 and is provided with the shield 40.
1. Connect the periphery of the hole 401a of No. 1 and the arm attachment portion,
It expands and contracts in response to the expansion and contraction of the arm 3.

Next, the operation will be described. Since the basic operation is the same as the conventional example, the description thereof is omitted. Since the shield 401 is fixed to the saddle 10, the processing tank 1 moves relative to the saddle 10 and also moves relative to the shield 401. Seal material 1
Since 01 is provided around the long hole 1a of the processing tank 1, the machining liquid 2 is slid on the shield 401 and the working liquid 2 is applied to the long hole 1a of the processing tank 1.
Prevent leakage from a. When the processing tank moves in the Y direction, the bellows 601 expands and contracts in the axial direction of the arm 3 to prevent the processing liquid 2 from leaking. In this embodiment, the shield is directly fixed to the saddle, and the support and guide members, which are conventionally 15 points, are omitted, so that the number of parts is greatly reduced, the assembly is facilitated, and the cost is reduced. Also, assemblability is improved.

Example 2. As shown in FIG. 4, in addition to the structure of the first embodiment, the shield 401 is made of a material having a low friction coefficient such as Teflon, and a shield plate 40 d.
1d is divided into support gold 401c that supports the saddle 10. In this embodiment, since a member having a low friction coefficient such as Teflon resin is used as the shield, the sliding friction resistance between the shield and the sealing material is reduced in addition to the effect of the first embodiment.

Embodiment 3 FIG. As shown in FIG. 5, in addition to the configuration of the first embodiment, the shield mounting portion of the saddle 10 and the processing tank 1 supporting portion on the saddle 10 are provided with reference surfaces 4 and 5, respectively.
As a result, the processing tank 1 is set parallel to the shield 401. Therefore, when the processing tank 1 moves relative to the shield 401, the gap between the processing tank 1 and the shield 401 is kept constant.

Example 4. As shown in FIG. 6, a groove 101b is provided around the elongated hole 1a of the processing tank 1, and a sealing material 101a having a circular cross section is provided inside the groove 101b via an elastic body 101c. However, in FIG. 1, the elastic body 10 in an uncompressed state
The sum of the groove depth dimension of 1c and the sealing material 101a dimension is
Depth-depth dimension of groove 101b, processing tank 1 and shield 401
It is set to be larger than the sum of the gap dimensions of and, and the difference between the two is the elastic body crushing margin. Since the seal material 101a and the elastic body 101c are inserted in the groove 101b, the seal material 101a and the elastic body 401 are not moved in the groove 1 even when the seal material 101a relatively moves while sliding on the shield 401.
There is no worry of coming off from 01c.

Embodiment 5 FIG. As shown in FIG. 7, in the configuration of the fourth embodiment, instead of the sealing material 101a, a sealing material 101e having a circular cross-sectional shape in which the side in contact with the shield 401 and a square side in contact with the elastic body 101c is employed. . As a result, the sealing material 101e is less likely to be buried in the elastic body 101c, so that the sealing material 101a is not elastic.
A more stable pressing force is provided.

Example 6. As shown in FIG. 8, in the configuration of the fourth embodiment, a cover 101d having a U-shaped cross section is inserted between the sealing material 101a and the elastic body 101c so as to cover the elastic body 101c. As a result, the sealing material 101a is less likely to be buried in the elastic body 101c, so that the sealing material 101a is provided with a more stable pressing force than the elastic body 101c.

Example 7. As shown in FIG. 9, in the machining fluid supply device according to the present invention, the machining fluid tank 211 includes a machining fluid tank bottom plate low step portion 47 and a machining fluid tank bottom plate high step portion 4.
8, and the working fluid supply pump 212 is installed on the working plate bottom plate lower step portion 47 side. The machining liquid supply pump 212 has an inverter 213 built therein. Further, in order to support the working liquid tank in parallel with the installation surface, a tank support angle 214 is provided on the working liquid tank bottom plate high step portion 48 side.

As shown in FIG. 9, the processing liquid tank top cover 4
The machining liquid filter cover 219, the machining liquid filter support 218, and the machining liquid filter 217 are installed on the upper surface of the nozzle 4.
At this time, the processing liquid filter 217 is attached to the filter cover 219.
Is sealed and covered by the machining fluid filter support portion so as to be slidable in the machining fluid filter removal direction. At this time, the working fluid 204 is charged by static electricity when passing through the working fluid hose 222, so that the working fluid filter 217 is also charged. Therefore, a discharge generating portion is formed between the working fluid 217, the working fluid filter 217, the working fluid filter cover 219, and the like. Therefore, the machining fluid filter 217
The machining fluid filter support portion 218 is electrically connected to an electrical conduction portion 220 made of a material having good electrical conductivity such as copper and grounded.

As shown in FIG. 10, a low position machining liquid level sensor 43 is provided at a position lower than the machining liquid level sensor 42 in the machining tank 205 to check whether the machining liquid is supplied near the bottom of the machining tank. Sense.

As shown in FIG. 11, when the inverter receives a rapid filling command by a program or button operation, the inverter rotates the working fluid supply pump at a medium speed. When the low position machining fluid level sensor confirms that some machining fluid has accumulated in the machining tank, the machining fluid supply pump power supply frequency is set to the power supply frequency or higher, and the machining fluid supply pump is switched to high speed rotation. When the sensor confirms that the machining tank is filled with machining fluid, it stops the machining fluid supply pump. Further, when a constant jetting command is received by a program or button operation, the machining fluid supply pump is rotated at a low speed to supply a relatively small amount of machining fluid to the machining tank. At this time, the machining status is judged from the signal from the machining power source, and the machining liquid supply amount for the optimum machining liquid supply is adjusted.

In the machining fluid supply device configured as described above, for example, when a machining fluid tank whose effective utilization amount is 525 liters is manufactured, the machining fluid tank has, for example, a length of 1500 mm and a width of 1000 mm. The height from the bottom of the high level part is 350mm, the bottom of the bottom of the low level part is 300mm, the width is 300mm, the height difference between the low level part and the high level part is 50mm, and the required amount of processing liquid is 5mm.
It becomes 29.5 liters. As described above, in the conventional machining fluid tank, if a machining fluid tank whose effective use amount is 525 liters is manufactured, the required machining fluid amount is 700
Since it is 1 liter, the required amount of working fluid can be greatly reduced with respect to the amount of working fluid that can be effectively utilized by the present invention.

Further, the machining liquid supply pump has an inverter built therein, and when the machining liquid supply pump receives a quick filling command, the inverter rotates the machining liquid supply pump at a medium speed, and when the machining liquid is slightly accumulated in the machining tank, the machining liquid supply pump is supplied. Switch to high speed rotation,
When the machining fluid is filled in the machining tank, the machining fluid supply pump is stopped, and when a jetting command is constantly received, the machining fluid supply pump is rotated at a low speed to supply a relatively small amount of machining fluid to the machining tank. By performing the control, it is not necessary to branch the machining fluid supply pipe into the rapid filling side and the constant jet side, and the switching valve is not required, so that the machining fluid supply pipe can be simplified. Further, the pump output can be increased by increasing the power supply frequency of the working fluid supply pump to be higher than the power source frequency, and the working fluid supply time can be shortened. Further, it is possible to prevent the processing liquid from splashing from the processing tank by rotating the processing liquid supply pump at a high speed in a state where the processing liquid does not enter the processing tank. Furthermore, by optimally controlling the amount of machining fluid supplied according to the machining situation, the machining state is improved, and by stopping the supply of machining fluid more than necessary, the supply of machining fluid is stopped to shorten the service life of the machining fluid filter. Can be extended.

Further, according to the structure in which the working fluid filter is slidably supported on the upper lid of the working fluid tank in the take-out direction and is hermetically covered, the working fluid filter is not immersed in the working fluid, so When exchanging, the working fluid can be exchanged with good workability without touching it, and the draining time is greatly shortened. Further, it is possible to prevent the flammable working fluid from leaking out of the cover.

Furthermore, according to the structure in which the electrical conduction portion is provided between the machining fluid filter and the machining fluid filter support portion, the machining fluid is charged by static electricity generated when passing through the machining fluid supply hose, etc. It is possible to prevent a discharge from occurring between the machining fluid filter and the machining fluid filter cover, etc., which is caused by the machining fluid filter being charged, and to prevent a fire.

[0039]

According to the present invention, the mounting portions of the processing tank and the shield are regulated by the reference surface so that the gap between the processing tank and the shield is always maintained even when the processing tank moves relative to the shield. Since the pressure is kept constant, the pressing force against the sealing material is kept constant even when moving in the processing tank X direction, and stable sealing is possible.

Further, in the present invention, by increasing the contact area of the sealing material on the elastic body side, the sealing material is less likely to be buried in the elastic body and a constant pressing force is obtained, so that stable sealing is possible. Becomes

Further, in the present invention, the cover is interposed between the sealing material and the elastic body, so that the sealing material is less likely to be buried in the elastic body and a constant pressing force is obtained, so that a stable seal can be achieved. Becomes

Furthermore, according to the present invention, a working fluid tank having two or more steps or slopes having a height difference or a bottom shape having both steps and inclinations, and a working fluid installed at the lower bottom of this working fluid tank. It is equipped with a pump, and the required working fluid for the volume of the working tank is relatively small. Therefore, the management of the working fluid is easy and the cost for exchanging the working fluid is reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view of an overall configuration showing a first embodiment of the present invention.

FIG. 2 is a top sectional plan view of the above embodiment.

FIG. 3 is a left front view of FIG.

FIG. 4 is a side cross-sectional view of the overall configuration showing Embodiment 2 of the present invention.

FIG. 5 is a side cross-sectional view of the entire configuration showing Embodiment 3 of the present invention.

FIG. 6 is a side cross-sectional view of the overall configuration showing Embodiment 4 of the present invention.

FIG. 7 is a detailed cross-sectional view of a sealing material showing Example 5 of the present invention.

FIG. 8 is a detailed cross-sectional view of a sealing material showing Example 6 of the present invention.

FIG. 9 is an explanatory diagram of a working fluid supply apparatus according to a seventh embodiment of the present invention.

FIG. 10 is a schematic configuration diagram showing an electric discharge machine according to a seventh embodiment of the present invention.

FIG. 11 is a flowchart showing a processing procedure of an inverter control device used in a machining fluid supply device according to a seventh embodiment of the present invention.

FIG. 12 is an overall schematic view of an electric discharge machine according to Embodiment 7 of the present invention.

FIG. 13 is a side sectional view of an entire configuration of a conventional example.

FIG. 14 is a plan sectional view of a main part of a conventional example.

FIG. 15 is a schematic configuration diagram showing a conventional electric discharge machine.

FIG. 16 is an explanatory diagram of a conventional machining liquid supply device.

FIG. 17 is an overall schematic view of a conventional electric discharge machine.

[Explanation of symbols]

1 is a processing tank, 1a is a long hole, 2 is a working liquid, 3 is an arm, 4
Is a reference surface, 5 is a reference surface, 7 is a wire electrode, 8a is an upper guide, 8b is a lower guide, 9 is a work piece, 10 is a saddle, 10a is a support stopper, 10b is a ring, and 10 is a ring.
0 is a holding metal fitting, 101 is a sealing material, 101a is a sealing material, 101b is a groove, 101c is an elastic body, 101d is a cover, 101e is a sealing material, 103 is a bearing, 104
Is a holding plate, 105 is a bearing, 401 is a shield, 40
1a is a hole, 401b is a resin, 401c is a support metal, 401
Reference numeral d is a shield plate, 402 is a pin, and 601 is a bellows.

Claims (4)

[Claims] 1. A processing tank that stores a working liquid and has a long hole formed in a horizontal direction in one plane and is movable in the longitudinal direction of the long hole; and a machining tank that supports the working tank in the longitudinal direction of the long hole. On the other hand, a saddle that is movable in a direction perpendicular to the saddle, a shield that is arranged so as to cover the long hole of the processing tank, and that is held by the saddle, and a hole that is provided in the shield are free to penetrate the processing tank. An arm that penetrates through the long hole and projects into the machining fluid and guides the wire, and a periphery of the hole of the shield that is provided coaxially with the arm and an arm mounting portion are connected to each other, and respond to expansion and contraction of the arm. A bellows that expands and contracts, and a sealing material disposed around the long hole of the processing tank, and a reference surface is provided on each of the shield mounting portion of the saddle and the processing tank supporting portion on the saddle. Electric discharge machine characterized by. 2. A processing tank which stores a processing liquid and which is formed in a horizontal direction in one plane and is movable in the longitudinal direction of the elongated hole; and a processing tank which supports the processing tank and extends in the longitudinal direction of the elongated hole. On the other hand, a saddle that is movable in a direction perpendicular to the saddle, a shield that is arranged so as to cover the long hole of the processing tank, and that is held by the saddle, and a hole that is provided in the shield are free to penetrate the processing tank. An arm that penetrates through the long hole and projects into the machining fluid and guides the wire, and a periphery of the hole of the shield that is provided coaxially with the arm and an arm mounting portion are connected to each other, and respond to expansion and contraction of the arm. A bellows that expands and contracts, and a sealing material provided via an elastic body in a groove arranged around the long hole of the processing tank, and the cross-sectional shape of the sealing material is the side that contacts the shielding body. Has a circular shape and the side in contact with the elastic body has a square shape. Processing equipment. 3. A machining tank which stores a machining liquid and has a long hole formed in a horizontal direction in one plane and is movable in the longitudinal direction of the long hole; and a machining tank which supports the machining tank and extends in the longitudinal direction of the long hole. On the other hand, a saddle that is movable in a direction perpendicular to the saddle, a shield that is arranged so as to cover the long hole of the processing tank, and that is held by the saddle, and a hole that is provided in the shield are free to penetrate the processing tank. An arm that penetrates through the long hole and projects into the machining fluid and guides the wire, and a periphery of the hole of the shield that is provided coaxially with the arm and an arm mounting portion are connected to each other, and respond to expansion and contraction of the arm. A bellows that expands and contracts, and a seal material provided via an elastic body in a groove arranged around the long hole of the processing tank are provided, and a U-shape is provided between the seal material and the elastic body. It is characterized by interposing a cover having a cross section of a shape in such a direction as to include an elastic body. Electrical discharge machine. 4. A machining fluid tank having two or more steps or slopes having different heights or a bottom shape having both steps and inclinations, and a machining fluid pump installed at the lower bottom of this machining fluid tank. And electrical discharge machine.