Automobile sheet metal parts are mostly made by cold stamping process. In the actual production, the automobile sheet metal stamping parts often appear a variety of defects: wrinkles, lamination, neck shrinkage, rebound, uneven cutting edge, burrs, pressure and slip line, etc. The defect of part stacking will lead to part scrapping. Based on working experience, this paper analyzes the solution to the problem of lamination of automobile sheet metal stamping parts.
Cause analysis: parts stamping process factors. This part adopts the forming process. On the one hand, the effect of using the forming process to control the material flow is worse than that of the drawing process, which is not conducive to restraining the problem of lamination. However, in order to improve the material utilization rate and reduce the cost of the whole vehicle, the forming process is adopted instead of the drawing process when designing the stamping process. On the other hand, the stamping direction is not conducive to the material flow in the laminated area during the stamping process. The state lamination problem of this part after the improvement of the forming process has been significantly improved.
This is because the following measures have been taken: optimizing the feature design of parts. The improved digital model added a bar in the laminated area. Additional bars can improve the problem of stacking by expanding the accumulated material. Two factors need to be taken into account to increase the bar. On the other hand, the height of the bars should not be too high, otherwise, the strength of the punch will be insufficient. Therefore, the increase of the size of the material - absorbing bar is limited, and the effect of improving the component lamination is also limited.
Optimize parts stamping process. Due to the limited effect of increasing the material suction bar to solve the problem of material stacking of parts, the stamping process of the parts is also considered to be optimized. When the forming process is adopted, the material flow can be optimized and the laminated defects can be restrained by choosing a reasonable punching direction. The improved punching direction is adopted to facilitate the material flow in the laminated area during stamping, thus improving the laminated phenomenon.
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