Transactions of Materials and Heat Treatment

Title：Research and improvement on wrinkling of front door inner panel for a certain vehicle

Authors： Xu Xiao Wang Zhen Li Hang

Unit： Anhui Jianghuai Automobile Group Co. Ltd.

KeyWords： front door inner panels wrinkling die clearance lancing drawing process

ClassificationCode：TG386

year,vol(issue):pagenumber：2019,44(7):34-40

Abstract：

For the wrinkling problem of front door inner panel for a certain vehicle, the possible causes were analyzed, and the check out one by one was conducted by combining CAE analysis with on-site debugging. Then, the possible influencing factors, such as drawing process, material properties, machine parameters, die surface quality, binder clearance and so on, were excluded, and the main causes of wrinkling were identified as too large machining clearance between punch and die at wrinkling position and too early work of lancing cutter. If the clearance between punch and die is too large, the axial compressive stress in sheet forming process is too small to hold the side wall in the drawing process, and the material is uncontrolled to wrinkle easily. While the lancing cutter works too early, the local material is uncontrolled to excessively flow into the side wall, and the compressive stress in the surface direction of material around the side wall area is increased. Thus, the wrinkling trend is aggravated. For the above reasons, the corresponding solutions that adjusting the clearance between punch and die to 0.75 mm and delaying the lancing time were developed. Finally, the wrinkling problem of front door inner panel is solved and the product surface quality is improved successfully.

Funds：

国家科技重大专项（2014ZX04002041）

徐肖（1988-），男，硕士，工程师，E-mail：xxfamily@sina.com

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