In this paper, the stamping forming of the rear longitudinal extension beam is taken as the research object. In view of the product cracking caused by the original forming process scheme, a pre forming process is proposed to solve this problem. The forming process is simulated by AutoForm software. Then, taking the bending angle of the product surface, the gap between the concave and convex dies, the friction coefficient, force and punch speed of the blank holder used as independent variables, as well as the maximum forming interval pull rate and maximum rebound after trimming as the objective function, the orthogonal test is designed to simulate the combination of the parameters, and then the grey correlation analysis is run to calculate the maximum thinning rate and the maximum springback of each group of test process parameters The grey correlation coefficient and correlation degree of the two targets. The optimal combination of process parameters is that the bending angle of the product surface is 60 °, the gap between the concave and convex dies is 0.2m m, the friction coefficient is 0.15, the blank holder force is 800KN, and the stamping speed is 2000 (mm/s). Using the optimized process parameters to simulate again, the simulation results show that the maximum thinning rate of the product is 12.5%. Using the forming process proposed in this paper, the actual trial production place has a good forming and qualified rear longitudinal extension beam.

Xu Hao, Wang Zhao, Huang Yao, Wang LeiGang. Cracking analysis and optimization of stamping forming of rear longitudinal extension beam based on CAE. The Frontiers of Society, Science and Technology (2020) Vol. 2 Issue 8: 17-22. https://doi.org/10.25236/FSST.2020.020804.

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