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A Method of Forming 3D Surface by Discrete Displacement Loading

A three-dimensional surface, discrete technology, used in the stretch forming of large three-dimensional surface parts and sheet metal forming, can solve the problems of large amount of process waste, uneven deformation, and small degree of uneven deformation.

Inactive Publication Date: 2016-01-13
JILIN UNIV
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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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  • A Method of Forming 3D Surface by Discrete Displacement Loading
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  • A Method of Forming 3D Surface by Discrete Displacement Loading

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Embodiment Construction

[0038] Further illustrate detailed content of the present invention and specific implementation thereof below in conjunction with accompanying drawing:

[0039] 1. Refer to figure 1 and figure 2 , the displacement load of the discrete displacement loading method is applied to a series of discrete points 7 and 8 located at both ends of the sheet through two rows of loading control units. The loading control units 2 are symmetrically arranged on the left and right sides of the drawing die 1, and the distributed and time-varying displacement loads are formed through the point-by-point independent control of each loading control unit 2 on both ends of the sheet metal.

[0040] 2. The loading control unit 2 is composed of the oil cylinder A4, the oil cylinder B5 and the clamp 6. One loading control unit controls one loading point at the end of the sheet. The movement of each loading point in the xz plane is realized by the clamp 6 of the loading control unit 2. The movement of t...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/26B21D24/14
Inventor 蔡中义杨振刘纯国李湘吉李明哲
Owner JILIN UNIV
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