Complex space curved surface thin plate forming die face designing method taking springback compensation

A springback compensation and design method technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as many discrete points, a lot of time for fitting and repair, failure of springback compensation, etc.

Active Publication Date: 2015-04-29
CENT SOUTH UNIV
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Problems solved by technology

[0003] In order to solve the problem of complex space surface thin plate forming die surface design considering springback compensation, two problems need to be solved: 1. The problem of springback compensation method; 2. The problem of complex space surface reconstruction
If conventional methods are used to fit complex spatial surfaces, there will be a problem of poor surface smoothness, resulting in failure of springback compensation and due to the large number of discrete points, fitting and repair will take a lot of time

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  • Complex space curved surface thin plate forming die face designing method taking springback compensation
  • Complex space curved surface thin plate forming die face designing method taking springback compensation
  • Complex space curved surface thin plate forming die face designing method taking springback compensation

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Embodiment Construction

[0067] A design method for complex space curved thin plate forming die surface considering springback compensation, the basic process is as follows figure 1 As shown, the specific implementation process of the method is illustrated by taking the helical blade of a concrete mixer truck as an example. The established stamping model is as figure 2 As shown, the uppermost curved surface represents the upper die, the one with two guide pillars represents the lower die, and the middle one represents the blank. The parameter settings in ABAQUS are shown in Table 1.

[0068] (1) Simulate the ideal product shape h L For the stamping process of the die surface, the joint stress of the thin plate before springback is obtained F L , and its stress cloud diagram is as follows image 3 shown;

[0069] (2) if Figure 4 As shown, using the nodal stress matrix F L multiply diagonal matrix α n owned- α n F L As the prestress is loaded on the sheet node, calculate the sheet in ...

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Abstract

The invention relates to a complex space curved surface thin plate forming die face designing method taking springback compensation. The method includes using a finite element method to simulate a plate forming process by taking ideal product appearance as a die face to acquire stress matrix of a punched plate node; using a modified forward rebound method for iterative solving to acquire compensation displacement matrix of a curved surface node; using a modified body deformation method to fit a node to acquire a curved surface after compensation, and constantly repeating the above process until the die face can pun qualified products. In order to increase compensation speed, the forward rebound method is modified, so that calculated quantity of iteration of each time is reduced; reconstruction from points to the complex curved surface is realized in iterative steps. By a modified body deformation algorithm, the advantage of smoothness of the curved surface constructed by the body deformation algorithm is maintained while calculated quantity is reduced, and quick designing of rebound compensation die faces is realized.

Description

technical field [0001] The invention relates to a design method of a mold surface considering springback compensation, in particular to a design method of a complex space curved thin plate forming die surface considering springback compensation. Background technique [0002] A large number of space curved thin plates, such as automobile panels, aircraft sheet metal parts, and concrete mixer truck spiral blades, are obtained by stamping with molds. After stamping, the springback error of complex space curved thin plates is very obvious, which directly affects the difficulty and efficiency of subsequent assembly. Therefore, it is necessary to repeatedly correct the mold until a qualified part is punched out. The traditional mold correction method has a long duration and high cost. However, springback phenomenon is ubiquitous, and it is not easy to popularize a part stamping law on a large scale; in addition, if complex spatial surfaces are reconstructed by conventional method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 杨忠炯袁宏亮周立强李洪宾鲁耀中姜东升高雨王卉周剑奇董栋
Owner CENT SOUTH UNIV
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