锻压技术

基于FEM的汽车用护罩零件的变压边力冲压技术

英文标题：Variable blank holder force stamping technology for automotive shield part based on FEM

作者：王亚

分类号：TG386.2

出版年,卷(期):页码：2022,47(8):41-46

摘要：

以某车用护罩零件为研究对象，通过Deform有限元软件对定压边力与变压边力两种加载方式对冲压成形的影响进行了研究。综合考虑护罩质量和模具寿命两项指标，结合灰色关联理论建立了优化目标函数，同时采用正交试验法，以上模在5个不同位置（下压0、10、20、30和40 mm）的压边力大小作为试验变量，进行了不同水平的试验研究，并通过极差分析法获得了变压边力的最优加载方式。模拟结果表明：与定压边力加载方式相比，变压边力加载方式更利于板料的流动，出现缺陷的概率更小，冲压件的成形质量更好，且相同条件下模具寿命更长，具体表现为冲压件的最大减薄率降低为22.85%、最大增厚率降低为7.85%、成形载荷降低为488 kN。经冲压试验证明，护罩零件质量稳定，可进行批量生产，最大减薄率和最大增厚率分别为23.00%和8.05%。

For an automotive shield part, the influences of two kinds of loading modes for constant blank holder force and variable blank holder force on stamping were studied by Deform finite element software, and considering the two indexes of shield quality and die life, the optimization objective function was established by combing with grey correlation theory. Then, at the same time, the orthogonal test method was adopted, and the blank holder force of upper die at five different positions (press amount of 0, 10, 20, 30 and 40 mm) was taken as the test variables, the test research at different levels was carried out, and the optimal loading mode of variable blank holder force was obtained by range analysis method. The simulation results show that compared with the constant blank holder force loading mode, the variable blank holder force loading mode is more conducive to sheet metal flow, the probability of defects is smaller, the forming quality of stamping parts is better, and the die life is longer under the same conditions, namely, the maximum thinning rate of stamping parts is reduced to 22.85%, the maximum thickening rate is reduced to 7.85%, and the forming load is reduced to 488 kN. The stamping test shows that the quality of shield parts is stable and can be mass produced, and the maximum thinning rate and the maximum thickening rate are 23.00% and 8.05% respectively.

基金项目：

河南省高校创新人才计划（2021PYCXRC01）

作者简介：王亚（1981-），男，学士，讲师，E-mail：wangya198102@163.com

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