SU1540902A1 - Method of producing hollow articles - Google Patents

Abstract

The invention relates to the processing of metals and can be used in mechanical engineering in the manufacture of hollow sheet metal products. The purpose of the invention is to increase the height of manufactured parts by preventing their rupture in a dangerous section. The final shaping of the semi-finished product 8 is carried out in two multiple alternating stages. At the first stage, the return stretching is carried out to obtain semi-finished product 8 with a flange with a height lower than the height of the finished product. At the second stage, the flange of the semi-finished product 8 is reformed into a cone with simultaneous crimping of its elongated part. Phased deformation reduces the tensile stresses in the wall of the manufactured product. 10 il.

Description

FIG. AT

The invention relates to the processing of metals by pressure and relates to methods for the manufacture of hollow articles.

The purpose of the invention is to increase the height of manufactured parts by preventing their rupture in a dangerous section.

FIG. 1 shows a drawing of a conical semi-finished product from sheet stock; in fig. 2-7 are the stages of final shaping; in fig. 8 shows a device for carrying out the method, a longitudinal section (to the left of the axis of symmetry — at the time of the end of the molding of the conical semi-finished product, to the right — before the start of the first stage); FIG. 9 - the same, to the left of the axis of symmetry - at the moment of the end of the first stage; on the right, at the moment of the end of the second stage; in fig. 10 - the same, to the left of the axis of symmetry - at the moment of the end of crimping, to the right - before the beginning of the last cycle.

A device for carrying out the method comprises a punch 1, a sectional matrix 2 with springs 3, an upper 4 and a lower 5 clamps, the last of which is installed in contact with the pushers 6.

The method is carried out as follows.

From flat billet 7, the conical semi-finished product 8 is pulled by means of the upper 4 and lower 5 clamps. A final shaping is then carried out, which is carried out in two multiple alternating steps. In the first stage, the punch 1 produces a reverse draw.

to obtain semi-finished product 8 with a flange of a height smaller than the height of the finished product 9. At the second stage, the flange of the semi-finished product 8 is transformed into a cone while simultaneously compressing the stretched part, while the diameter of the semi-finished product is reduced. The first and second steps are repeated until the finished product is obtained.

Due to the fact that the manufacturing of the part is not carried out continuously, but gradually, in the wall of the manufactured product, the magnitude of the tensile stress decreases, which prevents its rupture in a dangerous section.

Thus, this method, in comparison with the known method, provides an increase in the height of manufactured products.

Claims (1)

Invention Formula A method of manufacturing hollow articles, comprising drawing a conical semi-finished product from sheet billet and its final shaping, characterized in that, in order to increase the height of the manufactured parts by preventing their rupture in a dangerous section, the final formation of a semi-finished product is carried out in two alternating stages the first of which is reverse-drawn to obtain a semi-finished product with a flange height lower than the height of the finished product, and the second is reshaping the flange of the semi-fabricated ata cone while crimping an elongate portion thereof. Fzg.1 FIG. 2 fig-6 Fig.Z FIG. 7 Fock. eight Fig.Yu