JPS632258Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a jig for reverse electrical discharge machining equipment that uses a metal plate and a discharge punch, each having an X and Y reference plane, to accurately align the discharge punch and the electrode plate at a predetermined position. Regarding.

Generally, when manufacturing punches or dies for molds,
The punch or die material is heat treated to obtain a predetermined hardness and precision, and then manufactured by reverse electrical discharge machining or the like. However, in conventional manufacturing, it is difficult to determine the relative position of the punch and the electrode plate, and it takes a lot of time to set up, requires a high degree of skill, and has many drawbacks such as inability to obtain precision. had.

SUMMARY OF THE INVENTION In view of the above drawbacks, it is an object of the present invention to provide a jig for reverse electrical discharge machining, which can accurately determine the relative position of the punch and the electrode plate, and can shorten the setting time.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a metal plate 1 is made of a thick iron plate or the like, and the metal plate 1 has a first
A reference plane 3 and an upper surface 4 perpendicular to both reference planes 2 and 3.
is formed. Furthermore, there is a first X in the center.
An angular through hole 5 is formed in the plate thickness direction parallel to the Y reference planes 2 and 3, and four screw holes 6 serving as positioning means and two positioning holes are formed near both edges of the through hole 5.
Knock pins 7, 7 are provided. An electrode plate 8 is placed on the upper surface 4 of the metal plate 1 so as to close the through hole 5, and is made of, for example, a copper plate. Furthermore, the above-mentioned knock pin 7 is provided near the side edge.
Small holes 9, 9 matching the screw holes 6 are bored, and four through holes 10 are bored in positions corresponding to the screw holes 6. Then, by fitting the small holes 9, 9 of the electrode plate 8 into the knock pins 7, 7 of the metal plate 1, and then screwing the mounting screws 11 into the screw holes 6, the metal plate 1 and the electrode plate 8 are connected. fixed at a predetermined position. Further, a mold hole 12 of an arbitrary shape is previously formed in the electrode plate 8 by wire cutting or the like, and this mold hole 12 is formed around a center point O, which is an intersection point in the X-Y direction. This center point O is the first point of the metal plate 1.
The dimensions from the X and Y reference planes 2 and 3 are at predetermined positions.

On the other hand, the discharge punch 13 made of iron or the like has a second X reference plane 14 and a second Y reference plane 15 formed at right angles on the base 16. Furthermore, the portion 17 to be processed below is cut in advance into a slightly larger size approximating the mold hole 12 of the electrode plate 8, and is also heat treated.

Thus, the processed portion 17 of the discharge punch 13
When molding the metal plate 1 into a male die of a press machine by reverse electric discharge machining, first, as shown in FIG.
X and Y reference planes 2, 3 and the second of the discharge punch 13
The X and Y reference planes 14 and 15 of At this time, in order to confirm the coincidence, it is desirable to use a dial gauge (not shown), and it is sufficient that the indications of this dial gauge become zero even if they contact both the first and second reference surfaces.

After that, the discharge punch 13 is moved in the X and Y directions, but since the position of the center point O of the electrode plate 8 is determined in advance, the discharge punch 13 is moved by this dimension.
If the electrode plate 8 is transferred, the mold hole 12 of the electrode plate 8 and the discharge punch 1 are removed.
3 matches exactly. Then, when the electrode plate 12 is set to a negative potential and the discharge punch 13 is set to a positive potential, and the discharge punch 13 is lowered into the mold hole 12, the processed portion 17 of the discharge punch 13 is molded by reverse discharge as is well known. be able to.

In addition, when molding a die using the above-mentioned jig, the electrode plate 8 is made of iron material for the die, the discharge punch 13 is made of copper material, and the reverse discharge machining is performed by positioning using the same procedure as above. good.

Further, when the base 16 of the discharge punch 13 is in the shape of a round column, a jig having both reference surfaces 14 and 15 may be integrally attached thereto.

Furthermore, the positioning means may be changed to any other configuration.

According to the present invention described above, the first X and Y reference planes are provided on the metal plate on which the electrode plate is accurately positioned and fixed, and the second X and Y reference planes are also provided on the discharge punch.
Since the reference plane is provided, the relative position between the electrode plate and the discharge punch can be accurately obtained simply by moving the discharge punch by a specified distance in the X and Y directions. Moreover,
By using such a jig, installation can be done in a short time without requiring any skill. Further, by preparing a plurality of electrode plates and replacing them, it is possible to easily manufacture various types of punches or dies. Furthermore, there are practical effects such as being able to standardize the sizes of the electrode plates and discharge punches.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being an exploded perspective view of the jig, and FIG. 2 being a plan view. 1... Metal plate, 2... First X reference plane, 3...
First Y reference plane, 4...Top surface, 5...Through hole, 6...
...Screw hole, 7...Knock pin, 8...Electrode plate, 9...
...Small hole, 10...Through hole, 12...Mold hole, 13...
...Discharge punch, 14...Second X reference plane, 15...
...Second Y reference plane.

Claims (1)

[Scope of utility model registration request] It has three surfaces: a first X and Y reference plane formed at right angles, and an upper surface perpendicular to both reference planes, and a through hole parallel to both of the reference planes is formed in the center, and a plurality of holes are formed on the upper surface. A metal plate provided with positioning means such as a screw hole and a dowel pin, and a through hole etc. that engages with the positioning means such as the dowel pin are provided near the side edge, and the upper surface of the metal plate is provided so as to close the through hole. The first X and Y reference surfaces of the metal plate and the second A jig for a reverse electrical discharge machining apparatus, wherein the electrode plate and the discharge punch are brought into alignment with a predetermined position by moving the electrode plate and the discharge punch by a specified distance in the X direction and the Y direction while aligning the electrode plate and the Y reference plane.