Three-dimensional Curved Surface Stretch Forming Method Based on Deformed Surface Discrete Die

Abstract

The invention provides a three-dimensional curved surface stretch forming method based on a surface-changing discrete mould, and belongs to the field of metal plastic machining. Nonuniform deformation of a plate in the stretch forming process is the main cause of kinds of defects. According to the method, based on the discrete mould, the forming process of a curved surface is controlled through the change of the mould surface. In the forming process, the plate is kept completely attached to the mould surface all the time, the continuous and uniform change of the mould surface makes the deformation of the plate more and more uniform, the forming defects are avoided, and a high-quality curved-surface part can be obtained through stretch forming. The discrete mould is composed of regularly-arrayed basic body units, and real-time control over the geometrical shape of the surface of the stretch forming mould is achieved by changing the height of the basic body units. Besides, in the stretch forming process, the plate is clamped by a clamp to rotate along with the change of the mould surface, the clamp does not need to move in the horizontal direction or height direction, and therefore a loading structure of stretch forming equipment can be simplified through the forming method.

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 an important processing method for large curved parts. The traditional drawing mold adopts a drawing mold with a fixed surface, and the geometry of the mold surface is designed according to the curved surface part to be formed. During the forming process, the clamps on both sides of the drawing die clamp the two ends of the sheet. Through the movement of the clamps, the sheet is gradually brought into contact with the mold, and finally it is completely attached to the mold to form a curved part. The use of traditional fixed-surface dies for drawing is likely to cause uneven deformation, cracks, wrinkles, slip lines, coarse grains and other defects. These problems are formed when materials such as aluminum alloy...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional fixed surface mold is prone to uneven deformation, thereby causing various defects on the formed parts. The present invention will provide a three-dimensional curved surface stretch forming based on the discrete mold of the deformed surface. method, the forming process of the curved surface is controlled by the change of the mold surface. During the forming process, the sheet material is always fully attached to the mold surface, so that the deformation of the sheet material tends to be uniform, thereby avoiding various forming defects and obtaining high-quality Extrusion Formed Surface Parts

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