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A method to generate a springback compensation surface based on mesh mapping of the edge lines or section lines of curved surfaces

A technology of springback compensation and edge line, which is applied in the field of sheet metal stamping and forming, can solve the problem that the dimensional accuracy of parts cannot meet the design dimensional requirements, etc.

Inactive Publication Date: 2009-09-30
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The part after springback no longer matches the geometric profile of the mold. If the profile is processed according to the geometric model of the part, the springback will cause the dimensional accuracy of the stamped part to fail to meet the design dimension requirements

Method used

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  • A method to generate a springback compensation surface based on mesh mapping of the edge lines or section lines of curved surfaces
  • A method to generate a springback compensation surface based on mesh mapping of the edge lines or section lines of curved surfaces
  • A method to generate a springback compensation surface based on mesh mapping of the edge lines or section lines of curved surfaces

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Embodiment Construction

[0028] The geometric model of the part is composed of multiple surfaces, and the mathematical model of each surface is composed of surface parameters and edge line parameters. These mathematical models are generally output in IGES format. By reading the IGES format file, each surface and the edge line on the surface can be obtained. These surfaces and curves can be numbered.

[0029] For each curve, according to its length or curvature, etc., it is divided into some small line segments, that is, a line is converted into some points. The number of each point is: surface number, curve number, point number.

[0030] The finite element analysis model is established based on the part geometry model. The mesh before springback and the geometric model of the part are the same in spatial position. The following is the method for each point to find its corresponding grid before rebounding: first, determine the center coordinates of each grid; through the relationship between the poi...

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Abstract

The present invention is a method to generate a springback compensation surface based on mesh mapping of the edge lines or section lines of curved surfaces. In this method, firstly, the edge lines of each surface in the geometric model of a part are selected and discretized into small segments. For larger surfaces, some section lines may be selected from the middle of the surfaces; secondly, after the position of the geometric model matches the position of mesh model, the points of intersection between the segments and the mesh will be found; thirdly, based on the one-to-one correspondence between springback compensation mesh and the pre-compensation mesh, the positions of the nodes on edge lines of the springback mesh are found; lastly, these nodes are fit into edge lines. Through these edge line segments, springback compensation surfaces can be established and the time for generation of springback compensation surface can be reduced.

Description

technical field [0001] The invention relates to the field of stamping forming of a set of thin plates. Specifically, it is a springback compensation surface generation method based on surface edge line or section line grid mapping. Background technique [0002] The car body is mainly thin sheet stamping parts. In order to improve the safety of the car body and reduce the weight of the car body, more and more high-strength steels are used in auto body parts, and the problem of stamping springback of high-strength steels is particularly prominent. The so-called springback refers to the release of elastic stress in the stamping part when the part is withdrawn from the stamping die, causing the deformation of the part. The parts after springback no longer match the geometric profile of the mold. If the profile is processed according to the geometric model of the part, the springback will cause the dimensional accuracy of the stamped part to fail to meet the design dimension re...

Claims

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Application Information

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IPC IPC(8): G06F17/50B21D22/00
Inventor 刘迪辉李光耀崔向阳郑刚
Owner HUNAN UNIV
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