Method for forming three-dimensional curve surface by using discrete displacement loading mode

Abstract

The invention relates to a method for forming a three-dimensional curve surface by using a discrete displacement loading mode, and belongs to the field of metal plastic processing. Uneven deformation is a main reason of various defects in formation of the three-dimensional curve surface. The formation process is controlled by adopting the discrete displacement loading mode; displacement loads are exerted to a series of discrete points at two ends of a panel by virtue of a loading control unit; the size and direction of each loading point displacement load change in real time. The invention provides a method for determining horizontal direction displacement and vertical direction displacement of each discrete loading point according to the target curve surface of a formed part. The homogenization of material deformation in the stretch forming process can be achieved by virtue of real-time control on each discrete point displacement; defects are avoided; formation of curve spare parts with large deformation is achieved; the laminating process of the panel can be improved; the process oddments are saved.

Description

technical field [0001] The invention belongs to the field of metal plastic processing, and relates to a sheet metal forming method, which is suitable for stretch forming of large three-dimensional curved surface parts. Background technique [0002] Stretch forming is the main processing method for large curved skin parts. The traditional sheet metal drawing adopts integral clamps. During the drawing process, the jaws move synchronously as a rigid whole. The end of the sheet clamped by the jaws always maintains a fixed shape, so that the sheet does not actively deform with the mold surface in the lateral direction. , resulting in uneven deformation, cracking, wrinkling, slip lines, coarse grains and other defects. These problems are especially prominent when forming materials such as aluminum alloys and titanium alloys with a small deformation controllable range. In addition, the overall loading mode also makes it difficult to attach the mold. In order to ensure the mold, th...

AI Technical Summary

Problems solved by technology

[0004] Uneven deformation is the main cause of various defects in large-scale three-dimensional curved surface stretch forming. The purpose of the present invention is to provide a method of stretch forming, which controls the forming process through discrete displacement loading, so that the degree of uneven deformation reaches Minimized, so as to avoid various forming defects, solve the problems of uneven deformation, poor molding, and many process wastes in the traditional drawing method, and obtain high-quality curved surface parts

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