Transactions of Materials and Heat Treatment

Title：Forming analysis and parameter optimization for automobile front bracket based on Dynaform

Authors： Chen Zhijun Liu Yu Cai Jiang Cheng Yamin Tang Feilong

Unit： School of Mechanical Engineering Xihua University

KeyWords： automobile front bracket drawing wrinkle crack numerical simulation

ClassificationCode：TG386

year,vol(issue):pagenumber：2017,42(6):174-179

Abstract：

The forming process of front bracket, and the meshing of tool body and sheet in the pretreatment of the finite element analysis were analyzed and discussed, and the influences of friction coefficient and blank holder force on sheet forming were investigated. The results show that the smaller friction coefficient increases the wrinkle tendency of parts, but improves the crack defects a lot. Based on the deformation analysis of the fracture danger zone on the stamping die surface, a further optimization on the blank holder force of die surface was conducted. So the multistage forming of front bracket fitting for the actual process was optimized and analyzed. Furthermore, an actual test carried out based on the optimized process parameters and the shape of die surface, and the qualified parts are obtained with 20% thinning rate and 5% thickening rate of sheet metal. Finally, the sheet thickness strain error between the actual test and the numerical simulation is within a range of 4%, and the blank outline shrinkage is consistent.

Funds：

四川省高校科研创新团队项目（15TD0016）；四川省教育厅项目（122208）

陈志珺（1991-），男，硕士研究生刘渝（1963-），男，博士，教授

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