RU2337785C2 - Method for production of puncheons for pressing cup-type items - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: half-finished product with business end is obtained from workpiece and processed. It undergoes thermal processing and polishing. Then cog profile is worked out by method of electroerosion on the lateral surface of business end of half-finished product.

EFFECT: improved quality of obtained item.

3 dwg

Description

The invention relates to the processing of metals by pressure and can be used for the manufacture of punches for extruding glass-type products having a serrated profile in the internal cavity, for example, shells of fragmentation munitions.

A known method of manufacturing punches for extruding glass-type products with an internal gear profile (see patent RU 2080550 C1, F42B 12/24, 05.27.1997).

However, the known method does not provide the manufacture of a tooth profile of a tool of good quality, since its manufacture is carried out by the milling method and due to the low roughness of the tooth surface when extruding products, significant specific forces arise, which reduces the resistance of the punch and the quality of processing of the tooth profile of the product.

The use after milling grinding of the serrated profile of the punch is difficult due to the possible discrepancy in the angular divergence of the teeth during processing even in the centers, as well as due to the small size of the teeth, size "L" and radius "R" (figure 2).

The problem to which the present invention is directed, is to eliminate the noted disadvantages.

This is achieved by the fact that the method of manufacturing punches for extruding glass-type products with an internal gear profile includes cutting a workpiece, obtaining a semi-finished product with a working part, processing it, heat treatment, grinding the semi-finished product and subsequent formation of a serrated profile on the side surface of its working part by electric discharge machining.

The essential feature "... the subsequent formation on the side surface of its (punch) working part of the gear profile by electrical discharge machining" allows you to provide a technical result to increase the operational qualities of the punch due to the manufacture of the gear profile with high machining accuracy, the accuracy of the angular location of the teeth, the reduction of specific forces at extruding products such as a glass to obtain a high-quality serrated profile of products and increasing tool life.

The possibility of achieving a technical result — ensuring high-quality manufacturing of a serrated profile of a punch with high purity of processing — see the book “Dimensional Electrical Processing of Materials,” edited by A. Glazkov, Moscow, “Higher School,” 1978, p. 69, 15th the line at the top "... you can ensure high precision machining", and p. 70, the 5th line at the bottom "... providing high quality machined surface".

The serrated profile of the punches is made on Japanese equipment - a coordinate-piercing electro-erosion installation with CNC from SODICK - technical specifications are attached.

Angle Resolution - 0.00833 ... ° (20``) Angular accuracy - thirty'' Processing Accuracy - within 7-10 mm per 300 mm of axial feed The best roughness of processing - up to 0.025 m Ra (class 12)

Figure 1 shows the punch, the manufacturing method of which is described in the invention,

figure 2 - node 1 in figure 1;

figure 3 is a view a in figure 2.

The method is as follows.

Cut the workpiece from the bar, process the surface “K” and the working part “P” of the semifinished product of the punch, conduct heat treatment and grinding the surface “K” and the working part “P”. Then carry out the formation of the tooth profile "P" with a copper electrode by EDM.

Thus, when implementing the claimed invention, the following conditions are met:

- means embodying the invention in its implementation, are intended for use in industry, namely in the manufacture of punches for extruding products such as glass, used, in particular, in the manufacture of products with an internal gear profile - shells of fragmentation munitions;

- for the claimed invention in the form in which it is characterized in the claims, the possibility of its implementation using the described means and methods is confirmed;

- means embodying the invention in its implementation, are able to provide the specified technical result;

- therefore, the claimed invention meets the condition of patentability and industrial applicability.

Confirmation is the fact of the manufacture of punches and products - shells of fragmentation ammunition at FSUE PA “Plant named after Sergo "

Claims (1)

A method of manufacturing punches for extruding products such as a glass with an internal gear profile, characterized in that it includes cutting a workpiece, obtaining a semi-finished product with a working part, its processing, heat treatment, grinding the semi-finished product and subsequent formation of a serrated profile on the side surface of its working part by electric discharge machining.

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