SU494898A1 - Shaped workpiece bending method - Google Patents

Description

(54) METHOD FOR BENDING PROFILE PREPARATIONS

one

The invention relates to the processing of metals by pressure and can be used in mechanical engineering in the manufacture of parts from bent profiles.

Known methods of bending profiles.

with stretch.

However, they, as a rule, imply bending from a piece of billet and therefore have a low productivity.

The purpose of the invention is to improve the performance of profile bending and stretching by allowing the bending of endless workpieces, for example, on profile bending mills.

This is achieved by the fact that according to the proposed method, the stretching of the strip is produced by straightening the transverse corrugations preformed on the outer surface of the article with respect to the center of curvature of the product.

FIG. 1 shows the possible implementation of the proposed method; in fig. 2 - the blank before the flexible one (section A-A in FIG. 1); in fig. 3 - the same, after bending (section B-B in Fig. 1).

Before the profile surface, which is flexible on the product’s outer surface relative to the center of curvature, i.e. The surface subjected to bending, is formed into transverse technological corrugations, and then, during the bending, they are spun out. When straightening transverse corrugations, the metal is moved in the direction of the length of the profile,

which causes the appearance of tensile stresses, which fully or partially compensate for the compressive stresses acting upon bending on the internal ones relative to the center

curvature of the edges of the profile and,

most, cause danger of formation of waviness on them due to loss of stability. At the same time, the occurrence of tensile stress on the outer surface of the profile leads to the appearance of bending moment (eccentric bending), which reduces the required value of the main bending moment.

The method can be implemented

for example, on a gseofilibochny mill, in rolls 1 of which on the workpiece 2 technological transverse corrugations are formed. In rollers 3, these corrugations straighten and simultaneously bend the workpiece along the required radius using bending roller 4.

Claims (1)

Invention Formula The method of bending profiled blanks with stretching, is different. i AA In order to increase productivity, stretching is performed by straightening transverse corrugations, preformed on the profile surface surface that is external to the center of curvature of the product. S