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Construction method of springback compensation grid models

A grid model and springback compensation technology, applied in the field of springback overcoming, can solve problems such as large errors and inapplicability to 3D parts, and achieve the effects of cost saving, accurate construction, and accurate compensation

Inactive Publication Date: 2018-09-28
HUNAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

At present, a variety of springback compensation methods have been applied to the construction of springback compensation mesh models, but some of these methods cannot be applied to complex 3D parts, and some have large errors in construction

Method used

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  • Construction method of springback compensation grid models
  • Construction method of springback compensation grid models
  • Construction method of springback compensation grid models

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Embodiment Construction

[0022] In the following description, combined with the schematic diagram of the grid model, the precise construction method of the springback compensation grid model will be explained. More specifically, the compensation process of a node will be used as an example. The same, thus realizing the precise construction of the springback compensation mesh model.

[0023] In the actual process, a suitable stamping process model is constructed according to the three-dimensional shape of the part, and the finite element is used for simulation calculation to obtain the mesh model before and after springback. In the obtained mesh model, the unit mesh used can be a triangular mesh or a quadrilateral mesh and other mesh shapes, and in the springback simulation calculation, the coarse mesh cannot be used to ensure the correspondence between the front and rear nodes. calculation. Since the unit grid in the grid model is composed of nodes one by one, as long as accurate compensation nodes a...

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Abstract

The invention discloses a construction method of springback compensation grid models. Finite-element analysis is used as a means to obtain grid models before and after springback through springback simulation calculation, and springback path relationships of nodes are constructed through a manner of corresponding-node line connection; then normal vectors of each corresponding node on the grid models before and after springback are calculated, and normal vectors and line segments of a grid model after springback are translated onto corresponding nodes of a grid model before springback, and anincluded angle of two normal vectors and a constructed plane are calculated; and then translated the normal vectors and line segments are rotated until the same coincide with the normal vectors of thenodes on the grid model before springback, and currently endpoints of the line segments are compensation nodes of solving. According to the method, reverse compensation of the nodes is carried out by a method, of rotating springback paths according to the normal vectors of the nodes, according to the characteristics that feature forms of parts before and after springback are not changed, and only curvature of curved surfaces is changed, thus location precision of each node of springback compensation is effectively guaranteed, and precise construction of the springback compensation grid models is realized.

Description

technical field [0001] The invention relates to a method for overcoming springback in the field of sheet metal stamping forming, in particular to a method for constructing a springback compensation grid model. Background technique [0002] Springback is an unavoidable phenomenon in sheet metal stamping forming, and it is also the most difficult problem to solve among forming defects. Springback affects the shape accuracy of parts and brings great difficulties to the subsequent assembly and welding process. The springback compensation method is currently the most widely used method to solve the springback problem. It pre-corrects the design surface of the mold so that the shape after springback is just consistent with the design model. This method can fundamentally eliminate the impact of springback. At present, iterative calculation based on finite element springback simulation is usually used to obtain a compensated mesh model, and then the surface is constructed through t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 龚志辉
Owner HUNAN UNIV
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