JPS62114827A - Wire electro-discharge machine - Google Patents

Abstract

PURPOSE:To prevent corrosion from gethering and reduce the cost of production as well as to make accuracy so better, by constituting a work table, where cooling water being sprayed out of a cooling water feed pipe is splattered, and an arm or the like of a wire electrode guide with cast iron, and applying resin coating to the surface. CONSTITUTION:A work table 28, being guided by a guide rail 27 on a saddle 23 which is guided by a guide rail 22 on a bed 21, is installed there, and a work 32 to be set on top of the table is movable in both X and Y directions. There are provided with a head 35 supporting an upper guide 34 and an arm 37 supporting a lower guide 36, while cooling water is fed out of a feed pipe 38, and a sump wall 39 is attached to the surroundings. And, the work table 28 and the arm 37 are formed with cast iron or the like small in a linear expansion coefficient, not using stainless steel, and since resin coating of polytetrafluoroethylene or the like is applied onto the surface, manufacturing cost is reduced and simultaneously accuracy is made so better.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in wire electrical discharge machines.

[Prior art and its problems]

The structure of a conventional wire electrical discharge machine is schematically shown in FIGS. 4 and 5. Referring to these figures, the wire electrical discharge machine includes a saddle 3 that is slidably supported by a pair of guide rails 2 on a bed 1, and a pair of guide rails 4 on the saddle 3 that support the movement of the saddle 3. The workpiece 7 is provided with a base table 5 supported slidably in a direction orthogonal to the direction, and a workpiece 7 can be mounted on a workpiece mounting base 6 mounted on the base table 5. By moving the saddle 3 and the base table 5, the workpiece 7 can be moved in the X and Y directions. A column 8 provided on the bed l has a head 10 supporting an upper guide 9 and a lower guide 11.
An arm 12 for supporting the upper guide 9 is provided.
The workpiece 7 is cut by the electric discharge generated between the wire electrode 13 stretched between the wire electrode 13 and the lower guide 11 and the workpiece 7 .

The wire electrical discharge machine includes a cooling water supply means 14 that injects cooling water onto the workpiece 7 along the wire electrode 13 during electrical discharge machining.

In such a wire electric discharge machine, the base table 5 is generally made of iron such as gray cast iron.
Since cooling water is sprayed along the wire 13 while cutting the workpiece 7, the workpiece mount 6 and arm 12 that are sprayed with cooling water have traditionally been made of stainless steel to ensure corrosion resistance. There is. This results in an increase in the cost of the workpiece mount 6 and arm 12. In addition, since the workpiece mounting base 6 is formed separately from the base table 5 and is placed and fixed on the base table 5, the height of the workpiece mounting base 6 from the bed I is increased, and the workpiece support structure is This causes instability. Moreover, this results in an increase in weight. Some models have a smaller base table 5 in order to reduce the weight of the workpiece support structure.
In this case, the guide rail 4 supporting the base table 5
The distance between the workpiece mounting bases 6 becomes narrower, and the amount of overhang of the workpiece mounting base 6 from the support point of the guide rail 4 becomes large, which causes the support structure to become mechanically unstable.

[Means for solving problems]

As a means for solving the above-mentioned problems, the present invention has the following features:
A wire electrical discharge machine comprising a workpiece support means for supporting the workpiece, a wire electrode guide means for guiding the wire electrode, and a cooling water supply means for spraying cooling water onto the workpiece along the wire electrode, A wire electric discharge machine is provided, characterized in that a surface of the workpiece support means and/or the wire electrode guide means, on which the cooling water sprayed from the cooling water supply means is sprayed, is coated with a resin.

[For production]

According to the above means according to the present invention, since the surface of the workpiece support means and/or the wire electrode guide means is coated with resin, the surface of the workpiece support means and/or the wire electrode guide means is sprayed with cooling water, so that the workpiece supporter is sprayed with cooling water. Corrosion of the surface of the means and wire electrode guide means is prevented by the resin coating. Therefore, there is no need to make the components of the workpiece support means and wire electrode guide means, which are exposed to cooling water, from stainless steel.

In a preferred embodiment of the present invention, the base table found in conventional wire electric discharge machines is omitted and the workpiece mounting base is directly supported by the guide rail on the saddle, thereby reducing the weight of the workpiece support structure. In addition, the height of the workpiece mounting base from the bed can be lowered, and a mechanically stable workpiece support structure can be achieved. Further, since the base table is omitted and the workpiece mounting base is directly supported by the guide rails, the interval between the guide rails can be sufficiently widened. Therefore, a mechanically stable workpiece support structure can be obtained.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 3 show one embodiment of the present invention. Referring to these figures, the wire electrical discharge machine includes a saddle 23 that is slidably supported by a pair of guide rails 22 on a bed 21. The bed 21 is provided with a drive device 24 for moving the saddle 23 along the guide rails 22. Here, the drive device 24 includes a ball screw shaft 25 disposed between and parallel to the guide rails 22, and the saddle 23 is provided with a ball napft 26 that is screwed into the ball screw shaft 25.

When the ball screw shaft 25 is rotated by a drive motor (not shown), the saddle 23 moves linearly along the guide rail 22.

A pair of guide rails 27 are provided on the saddle 23 and extend in a direction perpendicular to the guide rails 22. A workpiece mount 28 having a pair of sliders 28a is slidably supported on the guide rail 27. The workpiece mounting table 28 has a flat base 28b, and the slider 2
8a may be integrally formed on the lower surface of the base 28b, or may be fixed with bolts or the like. base 2
A support block 28c is provided integrally or detachably on the upper surface of 8b.

The saddle 23 is provided with a drive device 29 for moving the workpiece mount 28 along the guide rail 27. Here, the drive device 29 includes a ball screw shaft 30 disposed between and parallel to the guide rails 27,
A ball screw shaft 30 is attached to the base 28b of the workpiece mounting table 28.
A ball nut 31 is provided which is screwed into the ball nut. When the ball screw shaft 30 is rotated by a drive motor (not shown), the workpiece mounting base 28 moves linearly along the guide rail 27.

The workpiece 3 is placed on the support block 28c of the workpiece mounting table 28.
2 can be installed. The workpiece 32 can be moved in the XY directions by moving the saddle 23 and the workpiece mounting base 28. Column 33 provided in head 2I
A head 35 supporting the upper guide 34 and a lower guide 36 are shown.
An arm 37 for supporting the upper guide 3 is provided.
4 and the wire electrode WP workpiece 32 stretched between the lower guide 36 and the wire electrode WP workpiece 32, the workpiece 32 is cut.

The wire electrical discharge machine cuts the workpiece 32 along the wire electrode WP.
It is equipped with a cooling water supply means for injecting cooling water. This cooling water supply means includes a cooling water supply pipe 38 that supplies cooling water into the upper guide 34. Therefore, in this wire electric discharge machine, cooling water is injected downward from inside the upper guide 34 along the wire electrode wp. A water reservoir wall 39 is attached around the workpiece mount 28.

Since cooling water is applied to the workpiece mount 28 and arm 37, if the metal surface of the workpiece mount 28 or arm 37 is exposed, if a leak occurs during discharge, the workpiece mount 28 or arm 37 will be damaged. Electrolytic corrosion (corrosion) occurs on metal surfaces.

Therefore, the surfaces of the workpiece mount 28 and arm 37 (at least the parts that come into contact with cooling water) are coated with a resin coating 40 such as polytetrafluoroethylene, nylon, vinyl, etc. to ensure corrosion resistance. It has been subjected.

In the wire electric discharge machine having the above configuration, the surfaces of the workpiece mount 28 and arm 37 are coated with resin 4.
0, so there is no risk of corrosion due to electrolytic corrosion or the like. Therefore, it is not necessary to make the workpiece mount 28 and the arm 37 from expensive materials such as stainless steel. The workpiece mount 28 and the arm 37 can be made of a steel material that is cheaper than stainless steel and has a smaller coefficient of linear expansion, such as iron, gray cast iron, ductile cast iron, or the like. Since these materials have a smaller linear expansion coefficient than stainless steel, thermal deformation during discharge is reduced.

Therefore, if these materials are applied to the workpiece mount 28 and the arm 37, the accuracy of electrical discharge machining can be improved.

Furthermore, in the wire electrical discharge machine having the above configuration,
Since the base table seen in conventional wire electric discharge machines is omitted and the workpiece mounting base 28 is directly supported by the guide rail 27 on the saddle 23, the weight of the workpiece support structure can be reduced. At the same time, the height of the workpiece mounting base 28 from the bed 21 can be lowered, and a mechanically stable workpiece support structure can be achieved. Also, the workpiece mounting base 28 is directly attached to the guide tray/27.
, the distance between the guide rails 270 can be sufficiently increased. Therefore, a mechanically stable workpiece support structure can be obtained.

Although the illustrated embodiments have been described above, the present invention is not limited to the embodiments described above, and, for example, the workpiece mounting base 28 can have various shapes. Also,
A similar effect can be obtained by forming a similar resin coating on the surfaces of the upper guide 34 and the lower guide 36.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the surfaces of the workpiece support means and/or the wire electrode guide means to which the cooling water sprayed from the cooling water supply means is applied are coated with a resin. Corrosion of the surfaces of the workpiece support means and wire electrode guide means that are exposed to cooling water is prevented by the resin coating. Therefore, it is no longer necessary to make the component parts of the workpiece support means and wire electrode guide means, which are exposed to cooling water, from stainless steel, making it possible to provide a wire electric discharge machine that is inexpensive and has good corrosion resistance.

In addition, the component parts of the workpiece support means and wire electrode guide means that are exposed to cooling water can be made of materials with a smaller linear expansion coefficient than stainless steel, which reduces the decline in electrical discharge machining accuracy caused by thermal deformation. This means that we can provide electric discharge machines.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a wire electrical discharge machine showing an embodiment of the present invention, Fig. 2 is a partial cross-sectional front view of main parts of the wire electrical discharge machine shown in Fig. 1, and Fig. 3 is a schematic side view of a wire electrical discharge machine showing an embodiment of the present invention. Figure 4 is a side view schematically showing the structure of a conventional wire electric discharge machine; Figure 5 is a plan view of the main parts of the wire electric discharge machine shown in Figure 4. It is a partially sectional front view. 21... Head, 22... Guide rail,
23...saddle, 27...guide rail,
28... Workpiece mounting stand, 32... Workpiece, 34...
- Upper guide, 36... Lower guide, 37... Arm, 38... Cooling water supply pipe, 40... Resin coating, wp... Wire electrode. Part 1 ■ @ Figure 2 Mei 3 @ Part 4 ■ Figure Mei 5

Claims (1)

[Claims] 1. A work support means for supporting the work, a wire electrode guide means for guiding the wire electrode, and a cooling water supply means for injecting cooling water onto the work along the wire electrode. A wire electrical discharge machining machine comprising: a surface of the workpiece support means and/or the wire electrode guide means on which the cooling water sprayed from the cooling water supply means is coated with a resin. Machine. 2. The work supporting means includes a saddle slidably supported by a pair of guide rails on the bed, and a work mounting base slidably supported by a pair of guide rails on the saddle. 2. The wire electrical discharge machine according to claim 1, wherein at least the surface of the workpiece mount is coated with the resin. 3. The wire electric discharge machine according to claim 2, wherein the workpiece mount is made of a steel material having a smaller coefficient of linear expansion than stainless steel. 4. The wire electrode guide means includes an upper guide that guides the wire electrode above the workpiece, a head that supports the upper guide, a lower guide that guides the wire electrode below the workpiece, and a head that supports the lower guide. 2. The wire electrical discharge machine according to claim 1, further comprising: an arm, wherein at least a surface of the arm is coated with the resin. 5. The wire electrical discharge machine according to claim 4, wherein the arm is made of a steel material having a smaller coefficient of linear expansion than stainless steel. 6. The wire electrical discharge machine according to claim 1, wherein the resin is polytetrafluoroethylene, nylon, or vinyl.