SU493082A1 - Method of making bent grimped profiles - Google Patents

Description

one

The invention relates to the processing of metals by pressure, in particular to methods for the manufacture of curved corrugated rolled sections.

A known method of making curved profiles, in accordance with which the flat elements of the profile are made in succession and the corrugations are formed by local stretching, in which the corrugated part of the workpiece is pre-stretched in the transverse direction by giving it a curvilinear shape. With this method it is impossible in some cases to produce profiles with the required depth and configuration of the corrugations.

The purpose of the invention is improving the quality of profiles.

To do this, they initially pull out the parts of the billet intended to form flat goffer elements from them, then form the places of bending of the corrugations and simultaneously straighten the pre-curved sections to obtain the required configuration of the corrugation profile.

FIG. 1 shows a scheme for forming a triangular corrugation in accordance with the proposed method; in fig. 2 trapezoid corrugation molding scheme

in fig. 3 - profiles, on the flat areas of which corrugations can be formed using the proposed method.

From FIG. 1 that the corrugation is formed in the second and third transitions. First, in the second junction by transverse stretching of sections 1 two corrugations. The dimensions of the corrugations are determined from the condition that the sweep width of the corrugated area is less than the sweep width of the same area on the finished profile. The vertices 2 of the transition corrugations in the second transition are arranged across the width of the profile so that each vertex corresponds to the middle of the side wall 3 of the corrugations in the third transition. Top 4 of the corrugation.

0 from the least deformed section 5 in the previous transition. The sections, maximally deformed in the second transition (the tops of 2 transition corrugations) in the third transition, are slightly reduced; the formation of the top 4 of the corrugations is made from the section 5, which is slightly modified in the second transition. It should be noted that the local character

0 preliminary transverse deformation of the extrusion in the second transition is due to the presence of vertices 2 transition corrugations, the formation of the corrugations can be performed in two or in large quantities, e pairs of rolls. From the trapezoidal corrugation molding pattern (Fig. 2), it can be seen that the shaping process proceeds similarly to the formation of a triangular corrugation according to the scheme shown in FIG. 1. The difference lies in the configuration and in the fact that in the second transition three corrugations are simultaneously molded. The middle transition corrugation is intended to shape the wall 7 of the trapezoid corrugation. Thus, the use of local bending under stretching in the second transition provides an adequate supply of plasticity at the site of the shapes / over} (one

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Claims (1)

FIG. Z nor the top of the corrugations, where destruction is possible with known molding methods. Claims. A method of manufacturing curved corrugated profiles, including successive hemming of flat profile elements and forming corrugations due to local stretching of the material, in which the corrugated part of the workpiece is pre-stretched in the transverse direction by giving it a curvilinear shape, and the quality of the profiles, initially draw the areas of the workpiece intended to form the flat elements of the corrugation, then they form the bending points of the corrugations and simultaneously straighten and krivlennye portions to obtain the desired configuration of the profile of the corrugation. Fg / g J