A method of increasing the extension of special-shaped sheet metal parts

Abstract

The invention relates to a method for increasing elongation of a foreign-shaped sheet metal part. The method comprises the following steps: a material is prepared, and geometric profile angle of a blank at a to-be-tensioned corner is increased; the blank is bent freely at the to-be-tensioned corner, clamping is performed on two sides of the to-be-tensioned corner, and the material at the to-be-tensioned corner is restrained incompletely; flanging is performed on non-clamped edges, the blank is attached to a mold, covered with a mold cover and clamped, and the to-be-tensioned part of the part is tensioned. According to the method, by changing the geometrical shape and size of the blank, changing the clamping mode during part machining and changing the transformation mode of the material atthe corner, the effect of increasing the elongation of the material at the corner of the part can be realized, and the problem of insufficient elongation of the foreign-shaped sheet metal part in sheet metal work can be solved. The method is particularly suitable for machining of L-shaped, U-shaped and concave sheet metal parts with large tension amount.

Description

technical field [0001] The invention relates to a processing method for aircraft special-shaped sheet metal parts, in particular to a processing method for aircraft sheet metal parts such as L-shaped, U-shaped and concave-shaped aircraft with large stretching amount. Background technique [0002] Sheet metal processing uses the principle of metal plastic deformation, and mainly uses sheet metal tools and equipment to make sheets, profiles, pipes and other wool into various parts through cold pressing. Among them, for the processing of L-shaped, U-shaped and concave-shaped plate parts with large stretching amount, the traditional forming method is to use the rigid shape of the tire to compress the part wool, and apply pressure to the bending edge of the part to make it stick to the tire. The disadvantage is that the phenomenon of tensile stress concentration will occur in the bending radius area of ​​the part during forming, and the material of the part in the large-size and ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above, in order to overcome the shortcomings of insufficient material elongation in the processing of existing sheet metal special-shaped parts, a method for increasing the elongation of special-shaped sheet metal parts is provided

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