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Three-dimensional curved surface stretch forming method based on surface-changing discrete mould

A discrete mold and stretch forming technology, which is applied in the field of sheet metal forming and stretch forming of large three-dimensional curved surface parts, can solve problems such as uneven deformation

Inactive Publication Date: 2015-03-25
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Three-dimensional curved surface stretch forming method based on surface-changing discrete mould
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  • Three-dimensional curved surface stretch forming method based on surface-changing discrete mould

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specific Embodiment approach

[0055] like figure 1 and figure 2 As shown, the discrete mold 2 for stretch forming is composed of basic unit units 6 arranged in m rows and n columns. During the stretch forming process of the sheet material 4, the change of the mold surface 1 is controlled by the relative height change of each basic body, and the movement of the discrete mold 2 includes the overall lifting of the discrete mold 2 and the movement of each basic body in the discrete mold 2. Relative movement between body units 6.

[0056] like figure 2 and Figure 4 As shown, the clamp 3 clamps the sheet 4, and during the stretch forming process, it rotates with the tangential change of the edge of the mold surface 1, but does not move in the horizontal and height directions.

[0057] like figure 2 and Figure 4 As shown in Fig. 1, through the movement of the discrete mold 2 and the rotation of the clamp 3, it is ensured that the sheet 4 is always fully attached to the mold surface 1 during the forming...

specific Embodiment

[0080] The sheet material 4 is 400mm×240mm, the thickness h=1mm; the target curved surface of the three-dimensional curved surface part 5 is a spherical surface with a radius of 360mm, and the forming area of ​​the discrete mold 2 is 250mm×250mm; the discrete mold 2 consists of 10×10 basic body units 6 Composition, the size of the basic body is 25mm×25mm, the radius of the spherical head of the basic body unit 6 is r=15mm; the distance from the edge of the discrete mold 2 to the clamp 3 is l=45mm, and the elastic pad 7 is a polyurethane plate with a thickness H=30mm.

[0081] The specific steps of controlling the forming process of the three-dimensional curved surface stretch forming method based on the discrete mold of the deformed surface are as follows:

[0082] The first step: adjust the initial surface of the discrete mold 2 to a plane, and the clamp 3 clamps the sheet 4 to fit the initial plane of the mold;

[0083] The second step: determine the coordinate x of the cent...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/22B21D22/26B21D37/10
CPCB21D31/005B21D37/10
Inventor 蔡中义车朝杰李湘吉刘纯国彭鲲
Owner JILIN UNIV
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