SU1433579A1 - Die for making welded hollow articles by expansion - Google Patents

Abstract

Interpretation refers to sheet and tamming and can be used to make parts. from hollow welded shells. The goal is to increase the degree of deformation of the workpiece and improve the quality of the product by reducing the non-uniformity of deformation on the workpiece in the weld zone. The niBii contains a wedge I in the form of a truncated cone, sectional expansion tool 2 and lower plate 4. A semi-welded workpiece is put on sectional expansion tool 2 so that the welding HIOB is on section 3 with concave side edges. This allows in the process of shaping the UHT-HiHTb action of the contact C, - | friction preventing the mega.ya from flowing from the surface of the section in its middle part and height. When the ram moves, the press ;: iuun wedge 1 pushes the sectional 1 1Y razd11mn) (1 tool 2, sections of coherence. Ne () e 1 1 c 1. On the bottom plate 4 in |) adia, 11, naiipai, deform zagotonkh. By the process of distribution, taking into account the reduction of the size of the section 3 with concave side faces, the unevenness of deformation on the workpiece in the weld zone is reduced, thereby contributing to the degree of deformation of the workpiece. 4 li. i. (L

Description

four

00 WITH

cl

with

The invention relates to the processing of metals by pressure and can be used in the manufacture of hollow parts from welded hollow billets.

The purpose of the invention is to increase the limiting degree of deformation and improve the quality of products.

FIG. 1 - stamp is depicted; General Sh.I; in fig. 2 - the same, top view; in fig. 3 is a diagram of the action of circumferential tension in an arbitrary section of the workpiece; in fig. 4 - section in axonometry.

The stamp contains a wedge 1 in the form of a truncated cone, a sectional tool 2, comprising a section 3, having concave side faces, the bottom plate 4.

The stamp works as follows.

The workpiece 5 is put on a sectional tool 2 so that the weld seam 6 is on section 3. When the press is slid down, the wedge I pushes the section tool 2, the sections of which, moving in the radial direction along the bottom plate 4, deform the workpiece 5 .

The circumferential tensile forces P (Fig. 3), acting in an arbitrary 25 cross-section of the workpiece located on the surface of the tool section, can be determined by the formula

ten

20

five

40

R-R (

 k o

-it

a circumferential tensile force acting on the workpiece in the running plane of the workpiece from the section; angle of the tool section section;

friction coefficient,, 5; base of natural logarithm.

That the angle of the viewing solution smoothly changes along the height of the maximum amak1- iia of the torminimal AMS, in the middle of the section (Fig. 4), since laterally

five

the edges of the section that are not in contact with the workpiece are concave, the circumferential tensile forces P determined by the above formula will also vary along the height of the workpiece from the minimum value on the ends of the workpiece to the maximum in the middle of the height of the workpiece and on the surface of the section with concave

0 side faces will be deformed more intensely than the edge portions of the workpiece, which are sources of mic-. cracks arising in the process of cutting flat blanks. This will compensate for the difference in stress-strain state diagrams of the height of the workpiece on the connector between the tool sections and, therefore, reduce the non-uniformity of deformation in the weld seam area and ultimately lead to an increase in the maximum degree of deformation.

Claims (1)

As shown by experimental studies, a decrease in the angle of the tool section of the instrument in its middle part by 15-20% in comparison with the angle of the section solution at its end gives positive results. Invention Formula five A die for the manufacture of hollow welded products containing a sectional tool, the sections of which are installed with the possibility of radial movement on the bottom plate from the wedge, characterized in that, in order to increase the limiting degree of deformation and improve the quality of products, one of the sections of the tool serves for placement of welded 1pv billet, made with concave side edges, ensured by their extension in the circumferential direction of the contact surface area of the section with the workpiece in the middle part the height of the section is 15 ... 20% menype. than in the marginal parts of x. five .J Phi. Z  j j -. f