Transactions of Materials and Heat Treatment

Title：Reason analysis and solutions of wrinkles at corners of automobile rear door inner panel

Authors： Lin Kai You Binbo Su Dan Yang Jian Xie Guowen Xie Yutao

Unit： Guangzhou Automobile Group Co. Ltd. Automotive Engineering Institute

KeyWords： rear door inner panel stamping forming wrinkle drawbead addendum

ClassificationCode：TG386.1

year,vol(issue):pagenumber：2017,42(6):43-50

Abstract：

According to one common quality problem of stamping which widely exists in cars of mass production,the wrinkle at the corner of automobile rear door inner panel is studied. Firstly, the stamping model of one automobile rear door inner panel was built by FEM software for process analysis. And the reasons which caused the wrinkles during stamping were focused on. The result indicates that a compressive stress is the major reason that leads to the wrinkles at corner. In the mean time, the unreasonable designs for addendums and product structures at the corner of automobile rear door inner panel cause the instability in the Z-direction of sheets during stamping, and directly lead to the wrinkling problem. By optimizing the drawbeads, addendums and product structure, wrinkles disappear after FEM analysis, and the quality of rear door inner panel fulfills all production and quality requirements.

Funds：

林楷（1988-），男，硕士

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