锻压技术

新能源车悬架U形纵臂成形缺陷分析与工艺参数优化

英文标题：Defect analysis and process parameters optimization of Ushaped longitudinal arm forming for a new energy vehicle suspension

作者：刘斌曾艳

单位：（泛亚汽车技术中心有限公司试验认证部上海 201210)

关键词：U形纵臂冲压成形开裂减薄率有限元

分类号：

出版年,卷(期):页码：2019,44(2):43-50

摘要：

针对某新能源车U形SPCEN钢深冲纵臂在成形过程中的开裂问题，通过建立有限元模型，基于弹塑性有限元理论进行成形仿真计算，分析了上模压力、摩擦系数对成形结果中危险部位减薄率的影响规律。结果表明：上模压力在40~60 kN、摩擦系数在0.05~0.1范围内变化时，危险部位的减薄率先增大后减小；当上模压力为50 kN、摩擦系数为0.08时，危险部位减薄率最小。经试验验证，在实际生产中采用50 kN上模压力，成形前对板料进行涂油处理以改善摩擦条件时，开裂问题得到有效解决，危险部位厚度1.45 mm以上的成品率由不足60%提高至95%以上。

For the cracking problem of deepdrawn Ushaped longitudinal arm of SPCEN steel for a new energy vehicle，the finite element model was established，and the forming simulation calculation was conducted based on elastoplastic finite element theory. Then, the influences of upper die force and friction coefficient on the thinning rate of dangerous locations in forming results were analyzed. The results show that when the upper die force and friction coefficient change between 40-60 kN and 0.05-0.1, respectively, the thinning rate of dangerous locations increases first and then decreases. When the upper die force is 50 kN and the friction coefficient is 0.08, the thinning rate of dangerous locations is the smallest. The verified experiments show that when upper die force is 50 kN and the sheet material is oiled before forming to improve the friction condition, the cracking problem is effectively solved, and the yield of products with thickness of dangerous locations more than 1.45 mm increases from less than 60% to above 95%.

基金项目：

作者简介：刘斌（1981-），男，硕士，工程师 Email：csharpliu@126.com

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