Transactions of Materials and Heat Treatment

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

Authors： Sun Weipeng Sun Mingdong Chen Weihua Liu Yu Liu Jizhong Li Xingguo

Unit： Qingdao Branch FAW-Volkswagen Automobile Co. Ltd.

KeyWords： automobile door inner panel stamping process necking and cracking production stability material properties process performance index Ppk

ClassificationCode：TG386

year,vol(issue):pagenumber：2023,48(2):85-93

Abstract：

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.

Funds：

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

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