Transactions of Materials and Heat Treatment

Title：Simulation and experiment research on stretch bending of 7075 aluminum alloy curvature component with variable cross-section

Authors： Jin Yan1 Du Jianning1 Cui Li1 Guo Guiqiang2 Wang Yihan2 Li Xiaoqiang2 Li Dongsheng2

Unit： 1. AVIC Shenyang Aircraft Corporation 2. School of Mechanical Engineering and Automation Beihang University

KeyWords： 7075 aluminum alloy curvature component with variable cross-section stretch bending stretch force springback

ClassificationCode：TG306

year,vol(issue):pagenumber：2022,47(3):96-102

Abstract：

For the problems of obvious wrinkling, serious springback, large amount of manual knocking and repairing, and long process cycle in stretch bending of 7075 aluminum alloy curvature component with variable cross-section for a certain aircraft, a one-step stretch bending process method of the newly quenched profile was proposed, and through the combination of finite element simulation and process test, the influences laws of process parameters such as stretch force, profile width and wrapping angle on wrinkling, rupture and springback of part were analyzed and verified. The results show that increasing the tensile force can effectively inhibit wrinkling phenomenon inside the profile, reasonably reducing the profile width can reduce the risk of profile rupture, and increasing the wrapping angle can reduce the springback of part. The optimized stretch bending process parameters were obtained with the stretch force of 42 kN, initial profile width of 130 mm and the wrapping angle of 96°. Using this combination of parameters for stretch bending, the rupture of part does not occur, the wrinkling phenomenon inside the profile is effectively avoided, and the springback of part is reduced.

Funds：

国家自然科学基金资助项目（52105317）

作者简介：金妍（1978-），女，学士，高级工程师 E-mail：584496540@qq.com 通信作者：郭贵强（1988-），男，博士，中级职称 E-mail：guoguiqiang@buaa.edu.cn

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