锻压技术

基于Dynaform的汽车前托架成形分析及参数优化

英文标题：Forming analysis and parameter optimization for automobile front bracket based on Dynaform

作者：陈志珺刘渝蔡江程亚民唐飞龙

单位：西华大学

分类号：TG386

出版年,卷(期):页码：2017,42(6):174-179

摘要：

分析讨论了汽车前托架零件的成形工艺及有限元分析前处理中工具体与板料的网格划分；探究了摩擦系数、压边力对板料成形的影响。结果表明，较小的摩擦系数增加了零件的起皱趋势，但对破裂缺陷有较大改善；基于模面破裂危险区的形变分析，对模面修改后进一步进行压边力优化，从而进行了符合实际工艺的多阶段前托架成形优化分析。采用优化后的工艺参数和模面形状进行实际试冲，得到了合格的零件，板料变薄率和增厚率分别在20%与5%的允许范围内。实际试冲与数值模拟的板料厚度应变误差在4%范围内，且板料轮廓收料情况相符。

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.

基金项目：

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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