锻压技术

基于Autoform Sigma的汽车门内板生产稳定性与材料性能的关系

英文标题：Relationship between production stability and material properties on automobile door inner panel based on Autoform Sigma

作者：孙为朋孙明东陈伟华刘郁刘继忠李兴国

单位：一汽-大众汽车有限公司青岛分公司

关键词：汽车门内板冲压工艺缩颈开裂生产稳定性材料性能过程性能指数Ppk

分类号：TG386

出版年,卷(期):页码：2023,48(2):85-93

摘要：

针对汽车覆盖件冲压生产过程中发生的缩颈开裂频率高、稳定性低等问题，通过Autoform Sigma对4套批量生产的门内板拉延工艺开展了稳定性分析，将材料屈服强度、抗拉强度、r值和摩擦因数作为噪声变量，探究了参数波动对成形结果的影响。通过对比4套门内板生产实践结果，验证了有限元分析模型的有效性，研究发现，材料性能参数在公差内的波动对成形结果有显著影响。对4家钢厂的卷料进行取样分析，统计分析了各厂家材料的屈服强度、抗拉强度、r90/20值、rm/20值和n10~20值的稳定性。结果表明：仅控制材料性能规格上、下限不能反映材料的稳定性水平，虽然所有样本均处于公差之内，但是部分指标的过程性能指数Ppk小于1，过程能力较差，需要采取改善措施。基于此，提出了一种材料性能稳定性的管控方法，适用于主机厂管理，有助于提升冲压生产过程稳定性。

For the problems of high frequency for necking and cracking and low stability in the stamping production process of automobile panels, the stability analysis on the drawing process of four sets of mass-produced door inner panels was conducted by Autoform Sigma, and taking material yield strength, tensile strengths, r value and friction coefficient as noise variables, the influences of parameters fluctuation on the forming results were researched. Then, the effectiveness of the finite element analysis model was verified by comparing the production practice results for four sets of door inner panels, and it was found that the fluctuations of material property parameters within the tolerance had a significant effect on the forming results. Furthermore, the stabilities of yield strength, tensile strength, r90/20 value, rm/20 value and n10-20 value for material of each manufacturer were statistically analyzed by sampling and analyzing coils from four steel suppliers. The results show that the method of only control of upper and lower limits of material performance specification cannot reflect the stability level of material. Although all samples are within the tolerance, the process performance index Ppk of some indicators is less than 1, the process capability is poor, and the improvement measures are needed to carry out. Thus, based on this, a control method for the stability of material performance is proposed, which is suitable for the management of main factories and helps to improve the stability of stamping production process.

基金项目：

作者简介：孙为朋（1990-），男，硕士，工程师，E-mail：sunweipeng1949@163.com

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