SU801941A1 - Male die for finish punching - Google Patents

Description

one

The invention relates to a punching tool for metal forming and can be used for cutting blanks without edges and burrs.

A punch for finishing cutting is known, which contains a working part that repeats in outline the part contour, and an expanding part following it with an end face having a surface larger than the cross sectional area of the working part, and a tail part with a cylindrical portion rij.

The disadvantage of the known punch is the low resistance when cutting parts with a wave-like contour.

The aim of the invention is to increase the punch strength of the punch when cutting. ke details with a wavy contour.

This goal is achieved by the fact that the forming surface of the expanding part of the punch is inclined to the axis of the punch at different angles in different radial sections having the smallest value at the apexes of the waves of the contour of the working part and gradually increasing to the depressions. The angle of the forming part of the expanding part is in the range of 90-100 °.

FIG. 1 shows a punch, front view; in fig. 2 - the same plan view; in fig. 3 is a section A-A of FIG. 2 in FIG. 4 - section BB of FIG. 2; on

FIG. 5 is a sectional view BB of FIG. 2

The working part 1 of the punch repeats the contour of the part. Behind it, the expansion part 2 with an end surface, the area of which exceeds the cross-sectional area of the working part, extends. Tail - part 3 has a cylindrical section. The expanding part of the punch is designed in such a way that its surface

tilted to the axis of the punch at different angles in different radial sections; c. In section B – B, i.e. at the top of the wave contour of the working part, the value of the angle of inclination of the generatrix has

the smallest value. The greatest value of the angle of inclination takes in the section NIBB, i.e. in the radial section between the two waves of the contour of the working part. Most rational for cutting

the medium carbon thickness is the width of the end face of the expanding part, equal to 0.2 (20%) of the material being processed, and the value of the angle of inclination of the generatrix should be in the range of 90-100.

Claims (2)

Claim 1. A punch for fair cutting, containing a working part, repeating in plan the outline of the part and following it an expanding part with an end having an area larger than the cross-sectional area of the working part, and a tail part with a cylindrical section, characterized in that, in order to increase the resistance when cutting, parts with a wavy contour, 5 forming the surface of the expanding part of the punch is inclined to the axis of the punch at different angles in different radial sections, which have the least value at the vertices of the waves of the contour of the work s part and gradually increasing to pits. 2. The punch according to claim 1, on the basis of which the angle of inclination of the generatrix of the expanding part is in the range of 90-100 °.