锻压技术

汽车C柱内板上段拉延成形工艺优化

英文标题：Optimization on drawing process for upper section of automotive Cpillar inner panel

作者：祝阳王匀刘克素唐书浩

分类号：TG386

出版年,卷(期):页码：2018,43(6):32-36

摘要：

针对汽车C柱内板上段件的结构特点进行了工艺设计，利用有限元软件Autoform建立了汽车C柱内板上段拉延成形的有限元模型，并进行了首次拉延数值分析，零件存在拉裂和起皱缺陷。在此基础上，结合流动均匀性对拉延筋布置和拉延系数进行了多次优化，获得了压边力与增厚率及减薄率之间的定量变化规律，在压边力范围为300~600 kN时，最大增厚率随压边力的变大而减小，最大减薄率随压边力的增大而增大，得到了最优压边力为520 kN。最终数值分析结果表明，优化后的拉延参数可以消除零件成形中的开裂和起皱等缺陷。经过实验试冲，结果和优化的数值分析结果吻合度很好，最大减薄率仅相差0.5%。

A process for the structural features of Cpillar inner panel was designed, and a finite element model of drawing process for the upper Cpillar inner panel was established by FE software Autoform. Then, the first drawing numerical analysis was carried out, and the defects of cracking and wrinkling in part appeared. Based on the numerical analysis results combining with the flow uniformity theory, drawbeads arrangement and drawing coefficient were optimized for multiple times, and the quantitative variation among blank holder force, thickening and thinning ratio was obtained. During blank holder force of 300-600 kN, the maximum thickening ratio decreased with the increasing of blank holder force, and the maximum thinning ratio increased with the increasing of blank holder force. The optimal blank holder was chosen as 520 kN. Final numerical analysis results show that optimized drawing parameters can eliminate defects like cracking and wrinkling in the part forming. After experimental test, the results are in good agreement with that of optimized numerical analysis, of which the maximum thinning ratio difference is only 0.5%.

基金项目：

江苏省重点研发计划（BE2015134）；江苏高校优势学科建设工程（PAPD）

祝阳 (1991-)，男，硕士研究生；Email：357792410@qq.com；通讯作者：王匀（1975-），男，博士，教授；Email：wangyun@ujs.edu.cn

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