A Die Surface Design Method for Thin Plate Forming with Complicated Space Curved Surfaces Considering Springback Compensation
A springback compensation and design method technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problem of springback compensation method, fitting and repairing a lot of time, many discrete points and other problems
Active Publication Date: 2017-12-08
CENT SOUTH UNIV
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[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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[0069] 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.
[0070] (1) Simulate the ideal product shape h L is the stamping process of the die surface, and the joint stress F of the thin plate before springback is obtained L , and its stress cloud diagram is as follows image 3 shown;
[0071] (2) if Figure 4 As shown, the nodal stress matrix F L Multiply the diagonal matrix α n get-alpha n f L As the prestress is loaded on the sheet node, calculate the sheet in the p...
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The present invention relates to a design method for complex space curved thin plate forming die surface considering springback compensation. Firstly, the finite element method is used to simulate the sheet forming process with the ideal product shape as the die surface to obtain the stress matrix of the stamping sheet material nodes, and then use The modified forward springback method is iteratively solved to obtain the compensation displacement matrix of the surface nodes, and finally the modified body deformation method is used to fit the nodes to obtain the compensated surface, and the above process is repeated until the die surface can punch out qualified products. Among them, in order to improve the compensation speed, the forward rebound method is corrected to reduce the calculation amount of each iteration; and the reconstruction from the middle point of the iterative step to the complex surface, the modified volume deformation algorithm in the method of the present invention maintains the construction of the volume deformation algorithm The smoothness of the curved surface reduces the amount of calculation and realizes the rapid design of the springback compensation die surface.
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...
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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