JPS60234735A - Method of forming tool electrode for electrospark machining and forming punch of tool electrode for electrospark machining - Google Patents

Abstract

PURPOSE:To improve forming of an electrode face for electrospark machining in forging of a tool electrode for electrospark machining by a model punch by providing a bank of specified height around the uneven shape forming part of the model punch and thereby checking the flow of metal around the face of the electrode tool. CONSTITUTION:A bank 14 of height corresponding to the height of projection is provided around the shape of a model punch male die 10 made of steel. The bank 14 checks the flow of metal at the time of forging the tool electrode for electrospark machining 20 made of copper and makes a good tool electrode. By making electrospark machining of an actually used steel punch 30 by using this electrode 20 for machining, the actually used steel punch 30 is formed to a good shape free from shear droop.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a tool electrode for electrical discharge machining and a punch for forming a tool electrode for electrical discharge machining. To form a tool electrode surface for electric discharge machining having a predetermined uneven shape with high accuracy and no edge portions on the tool electrode surface by eliminating the flow phenomenon of tool electrode material along the surface of the tool electrode machining surface when machining the tool electrode. The present invention relates to a possible method for forming a tool electrode for electric discharge machining and a punch for forming a tool electrode for electric discharge machining used in the method.

Conventionally, in the manufacture of automobile tires, for example, in order to attach a brand to the outer surface of a tire, a curved side wall surface portion that forms the outer surface of the tire inside a tire forming mold made of aluminum or the like is attached. Using a brand punch with a male brand shape engraved on the surface following the wall shape, a female brand shape is engraved using the push forging method, the tire is formed using this tire forming mold, and the outside of the tire is formed. The brand is attached to the side. However, when producing the forged forming surface of this brand punch, the punch itself is made of steel and is hard, and the brand itself has many small parts.
It is often manufactured by electrical discharge machining because it is required to be constructed with high precision.

In order to manufacture the forged forming surface of this brand punch by electric discharge machining, it is necessary to create a tool electrode for electrical discharge machining made of copper or the like having a male-shaped uneven forming surface that fits with the forging forming surface of the brand punch. There is. In addition, a so-called model punch is required, which stamps the brand's female pattern on the surface of the electric discharge machining tool electrode using the indentation forging method. is attached to the electrode attachment part of the electric discharge machine, and the tool electrode is used to form a predetermined brand of uneven surface on the plant's punch.

However, when the model punch described above is used to press-forge a female mold surface of a given brand onto the surface of a tool electrode, the electrode material on the machined surface of the tool electrode is soft, such as copper, so the electrode material on the machined surface of the tool electrode is This causes the so-called meat flow phenomenon, which causes the edge part of the brand female uneven shape formed on the machined surface of the tool electrode to become sagging or distorted. It was difficult to form. In addition, as a result, the male shape of the brand of the brand punch itself, which is formed by electrical discharge machining using the tool electrode, cannot be formed with high precision, and the brand shape of the surface of the molded product attached using the brand punch cannot be formed with high accuracy. It also becomes distorted, etc.
In particular, an electric discharge machining tool electrode for manufacturing a brand punch whose forging forming surface is curved to follow the curved inner surface of the tire forming mold used for attaching the brand to the outer surface of the tire described above. However, when the forging forming surface is curved and forging is performed using a model punch, a particularly large flow phenomenon of the electrode material along the tool electrode surface is observed, and the brand attached to the surface of the formed product is Distortion was likely to occur.

The present invention has been made in view of the above-mentioned conventional problems: Therefore, the purpose of the present invention is to form a female-shaped uneven surface for forming a brand, etc. on the surface of a tool electrode for electrical discharge machining, such as for forming a brand punch, using a model punch. By sealing the so-called meat flow phenomenon in which the tool electrode material moves along the surface of the machined surface of the tool electrode, it is possible to form a highly accurate female pattern surface with no distortion or the like on the surface of the tool electrode. Copper, etc. can be formed using a model punch that uses this tool electrode to form a high-quality male-shaped uneven surface with high precision, and to attach a brand with high precision without distortion to the surface of a molded product. When forging a predetermined uneven shape on the surface of a tool electrode for electric discharge machining, a bank of a predetermined height is provided around the uneven surface of the model punch that forms the predetermined uneven shape on the surface of the tool electrode. A method for forming a tool electrode for electrical discharge machining, which is characterized by sealing the phenomenon of material running of the tool electrode material along the surface of the machined surface of the tool electrode, which sometimes occurs, and a tool electrode for electrical discharge machining made of copper or the like used in the method. In the model punch used when forging a predetermined uneven shape on the surface of An object of the present invention is to provide a punch for forming a tool electrode for electrical discharge machining, which is characterized by being provided with a bank of a predetermined height that prevents the material from running out of the tool electrode material.

Hereinafter, the present invention will be described in detail based on the drawings.

FIGS. 1 and 2 show a punch 10 for forming a tool electrode for electric discharge machining according to the present invention, and a forging forming surface 12 of the punch is engraved with a male uneven shape of a predetermined shape, for example, the brand letter B. has been done. Although the above is the same as the conventional model punch, the characteristic feature of the present invention is that the punch has male-shaped uneven plant letters engraved around the forging forming surface 12 on the forming surface. Embankment 1 of a predetermined height to surround
4 is provided protrudingly.

In addition, in FIGS. 3 and 4, the forming punch 1 described in "2" is shown.
Electrical discharge machining tool electrode 2 made of copper etc. forged using 0
0 is shown, and the tool electrode 20 is formed so that its surface is curved to follow the shape of the outer surface of the molded product to which the brand is attached, and an annular shape that fits into the molding punch 10 is formed on the surface of the tool electrode. The bank remains, and the female-shaped concave-convex shape 22 of the brand letter B is engraved on the inside thereof.

Furthermore, FIGS. 5 and 6 show the tool electrode 20 described above.
Iwamuru brand punch 30 is formed by electrical discharge machining using
A male uneven shape 32 is engraved to fit into the female uneven shape of the brand letter B on the front surface.

Next, the forming punch 1 shown in FIGS. 1 and 2 above is used.
To explain the method of forming the tool electrode 20 according to the present invention using B, first, the surface of the tool electrode 20 made of copper or the like is formed by free forging or the like using the punch 10 to form a female-shaped uneven shape 22 such as the brand letter B. Press and forge. Then, during push forging, the embankment 14 of a predetermined height around the forging forming surface 12 of the forming punch 10 digs into the periphery of the tool electrode processing surface, and the tool electrode material is thickened outward in all directions along the surface. Female type uneven shape 22 that prevents flow phenomenon and has good precision on the tool electrode machining surface, such as the Susena brand, which has drooping and distorted edges.
can be engraved.

In the above-described embodiments, the shape of the bank 14 may be a narrow protrusion or a stepped shape extending outwardly.

Furthermore, the method for forming the tool electrode 20 using the forming punch 10 and the method described above is a method for forming a tool electrode for electric discharge machining when manufacturing a brand punch, etc. used for attaching a brand to the side surface of a curved molded product. Not only is it particularly effective in manufacturing, but it can also be used to manufacture brand punches with higher precision when used in electric discharge machining tool electrodes for manufacturing brand punches, etc. used to attach brands to the side surfaces of flat molded products. As a result, brands, etc. can be attached to the side of the molded product more uniformly and accurately than with conventional products.

As described above, if an electric discharge machining tool electrode such as a brand punch is forged and formed by the forming punch and the forming method using the punch according to the present invention, the electric discharge machining tool when indentation forging is performed using the forming punch. By preventing the electrode material from flowing outward in all directions along the surface of the electrode machined surface, it is possible to form a highly accurate electrode machined surface for electric discharge machining, and as a result,
Using this tool electrode, electrical discharge machining processing such as brand punching can be performed with high precision, and the brand on the side of the molded product attached using this brand punch, etc. will not be distorted or its edges will sag, and it will be accurate and uniform. can be formed into

Further, the forming punch of the present invention can be constructed by only slightly improving a conventional model punch, etc., and the forming method using the punch is exactly the same as conventional push forging, and can be easily carried out.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

1 and 2 are a plan view and an A-A end view of the forming punch of the present invention, respectively, and FIG. 3 is a plan view of a tool electrode formed using the forming punch shown in FIG. 1, respectively. figure(
al, (b) is the same B-B end view and side view of the tool electrode, and Figures 5 and 6 are the plan view and front view, respectively, of a brand punch made using the tool electrode in Figure 3. . 10... Forming punch, 12... Forging forming surface, 14
... Tsutsumi, 20... Tool electrode for electrical discharge machining, 22...
・Female uneven shape, 30...Brand punch, 32...
・Male uneven shape. Patent applicant Masanobu Obuchi 1 Figure 3 Figure 2 Figure 4 Figure 5 2 Figure 6

Claims (1)

[Claims] 1. When forging a predetermined uneven shape on the surface of an electric discharge machining tool electrode made of copper or the like using a model punch, the unevenness of the model punch that forms the predetermined uneven shape on the surface of the tool electrode by forging. A method for forming a tool electrode for electric discharge machining, characterized in that a bank of a predetermined height is provided around the forming surface to seal the flow phenomenon of the tool electrode material along the surface of the tool electrode processing surface that occurs during forging forming. . 2. In a model punch used for forging a predetermined uneven shape on the surface of a tool electrode for electric discharge machining made of copper, etc., the forging is applied around the uneven surface of the model punch that forms the predetermined uneven shape on the surface of the tool electrode by forging. 1. A punch for forming a tool electrode for electric discharge machining, characterized in that a bank is provided with a predetermined height for sealing the material flow phenomenon of the tool electrode material along the surface of the machined surface of the tool electrode that occurs during forming.