Determination of Hot Stamping Friction Coefficient of 7075 Aluminum

Metals

Zhiqiang Zhang¹  Mingwen Ren¹  Xu Yan¹  Hongjie Jia¹  Xiangji Li¹ 

[1] Key Laboratory of Automobile Materials, Ministry of Education and College of Materials Science and Engineering, Jilin University, Changchun 130025, China;

关键词: 7075 aluminum alloy;    hot stamping;    friction coefficient;    inverse problem optimization;   

DOI  :  10.3390/met11071111

来源: DOAJ

【 摘 要 】

Aluminum alloy hot stamping technology can improve the formability of materials and obtain parts with high dimensional accuracy. Friction behavior in the hot stamping process is very important for forming quality. Accurate friction coefficient is helpful to improve the prediction accuracy of forming defects. It is hard to obtain the friction coefficient by simple experiments due to the complicated thermal–mechanical coupling and contact conditions during the hot stamping of aluminum alloys. In order to explore the effect of friction behavior on forming quality, hot stamping experiments of 7075 aluminum alloy U-shaped parts with different lubricants were carried out. The influence of different lubricants on the force–displacement curve, material inflow, surface appearance, and thickness distribution of the formed part was analyzed. The results showed that a good lubrication effect could be obtained with the molybdenum disulfide lubricant. The friction coefficient under different lubrication conditions was obtained by using the inverse problem optimization method. Compared with the experimental results, the determined friction coefficients could accurately predict the force–displacement curves and the thickness distributions of formed parts under different lubrication conditions.

【 授权许可】

Unknown