JPS625862Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a guide holder for a wire-cut electrical discharge machine.

As shown in FIG. 5, this type of known guide holder has a support portion 13 that communicates with the wire electrode insertion hole 12 of a metal guide holder 11 and has a U-shaped longitudinal section on its end surface. Inside, there is a dome-shaped guide recess 15 on the wire electrode insertion hole 12 side.
The metal pedestal 14 formed with the above metal pedestal 14 is fitted and placed in the fitting groove 16 having a U-shaped longitudinal section on the upper surface of the metal pedestal 14.
A diamond 17 with a wire electrode insertion hole 18 formed in the center is embedded, and a non-conductive cap 19 with a dovetail-shaped through hole 20 is fitted and placed on the metal pedestal 14 and the diamond 17 to support the metal guide holder 11. A supporting edge 11a is formed by bending the U-shaped leading edge of the portion 13 toward the open side of the slotted hole 20 of the non-conductive cap 19, and forming a supporting edge 11a.
Accordingly, non-conductive cap 19, diamond 1
7 and a metal pedestal 14 are fitted and fixed within the support portion 13. As shown in FIG. 5, the metal guide holders A and B configured as described above are arranged vertically opposite each other with the open surfaces of the slotted holes 20 of the non-conductive caps 19 facing each other, and the wires 21 are passed through them. do,
The workpiece 22 is cut by the wire to which the current is applied by applying an electrode to the wire. The above-mentioned known wire-cut electric discharge machine has metal guide holders A, which are arranged vertically oppositely.
B were installed with large intervals in the vertical direction. Therefore, during processing and cutting of the workpiece 22, the wire 22 supported between the guide holders A and B was significantly bent. When the above-mentioned deflection occurs, processing accuracy decreases. Therefore, it is desirable that the upper and lower metal guide holders A and B be placed as close as possible to minimize deflection due to the pressure that occurs when cutting the workpiece 22. However, since the known metal guide holders A and B have metal support edges 11a and 11a formed at their tips as described above, there is no wire between the metal support edges 11a and 11a and the workpiece 22. A discharge phenomenon occurs due to the action of electricity communicated with 21, and the metal guide holders A and B
A stagnation phenomenon occurs between the tips of the wire electrodes, and cutting chips, dust, etc. are attached or welded to the wire electrode insertion holes 18, 12.
This caused problems such as wire breakage. In order to prevent the above-mentioned troubles, it is possible to form a layer of non-conductive material on the surface of the metal diamond guide holder 11, but this not only increases the number of manufacturing steps for the metal guide holder, but also reduces manufacturing efficiency. There are disadvantages such as the metal guide holder being expensive.

The present invention can be provided at the same cost as the conventional method without increasing the manufacturing process of metal guide holders, and it is possible to install metal guide holders A and B, which are vertically opposed, very close to each other. Even though
The purpose of the present invention is to provide a guide holder for a wire-cut electric discharge machine that does not cause a static electricity phenomenon between the tips of guide holders A and B, and therefore does not cause any trouble. A dovetail-shaped through hole 40 of the non-conductive cap 39 is formed on the upper surface of the pedestal 34 and the diamond 37.
The base 34, the diamond 37, and the non-conductive cap 3 are placed in the supporting part 33 with the open edges facing outward.
A non-conductive cap 39 is used in a wire cut electric discharge machine guide holder formed by fitting and fixing a non-conductive cap 39.
It has a structure in which the leading edge of the guide holder 31 is formed to protrude beyond the leading edge 31a surrounding the support portion 33 of the guide holder 31. In the above, the metal pedestal 34 includes, for example,
SUS304 or the like is used, and the non-conductive cap 39 is made of ruby, sapphire, ceramics, etc.
is formed into a straight cylindrical shape with the same diameter as the inner diameter of the support part 33, and the tip thereof is formed to protrude beyond the leading edge 31a surrounding the support part 33 of the metal guide holder 31. Non-conductive cap 3
The base portion 39a of the metal guide holder 31 is formed to have a diameter equal to the inner diameter of the support portion 33, and the fitting groove 41 of the inwardly bent edge 31a of the leading edge surrounding the support portion 33 of the metal guide holder 31 is formed on the outer periphery. This shows an embodiment in which a large diameter portion 39b is formed to protrude from the side bent edge 31a. In FIG. 4, a base 39a of a non-conductive cap 39 is formed with a large diameter, a small diameter part 39b is formed on one side, and the small diameter part 39b is attached to a metal guide holder 39.
This shows an embodiment in which the support portion 33 is protruded straight from the inwardly bent edge 31a of the leading edge surrounding the support portion 33. Note that the same reference numerals in FIGS. 1 to 5 indicate the same parts.

When the guide holders a and b of the present invention are arranged vertically opposite to each other as shown in FIG. conductive cap 39,
39, even if the two metal caps a and b are installed extremely close together, there will be no discharge phenomenon, and therefore, there will be no charge build-up between the two caps, so cutting chips, dust, etc. It is possible to cut the workpiece without blocking the electrode insertion hole 38, thus causing trouble, and reducing the processing viscosity.It is possible to extend the maintenance interval without interrupting the work. There are effects such as being able to do it.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a wire cut electric discharge machine using the guide holder of the present invention, Fig. 2 is a longitudinal cross-sectional view of the first embodiment of the guide holder of the present invention, and Fig. 3 is a longitudinal cross-sectional view of the guide holder of the present invention. FIG. 4 is a vertical cross-sectional view of the second embodiment of the present invention, and FIG.
FIG. 5 is a longitudinal sectional view of a known guide holder. 31...Metal guide holder, 31a...Inwardly bent edge, 32...Wire electrode insertion hole, 33...
...Support part, 34...Metal pedestal, 35...Rice-shaped guide recess, 36...Fitting groove, 37...Diamond, 38...Wire electrode insertion hole, 39...
...Non-conductive cap, 40...Single-shaped through hole,
41... Fitting groove, 42... Wire.

Claims (1)

[Scope of utility model registration request] The open edge of the slotted hole 40 of the non-conductive cap 39 is placed on the upper surface of the pedestal 34 and the diamond 37 facing outward, and the pedestal 34, the diamond 37, and the non-conductive cap 39 are fitted and fixed within the support portion 33. In the guide holder for a wire-cut electric discharge machine, the leading edge of the non-conductive cap 39 is formed to protrude beyond the leading edge surrounding the support part 33 of the guide holder 31.