Transactions of Materials and Heat Treatment

Title：Finite element simulation and springback prediction on whole process for CNC stretch forming process of nose cone skin

Authors： Zhang Hegang1 Wang Zhicheng2 Wang Xiaochen2 Du Jianning2 Peng Haoyun2 Zhu Li2 Li Xiaoqiang3 Yang Xiaojun4

Unit： 1.Hangfa Intelligent Manufacturing (Beijing) Technology Co. Ltd. Shenyang Aircraft Corporation 3.School of Mechanical Engineering and Automation Beihang University 4.C3P Engineering Softeware International Co. Ltd.

KeyWords： skin stretch forming springback prediction CNC stretch forming machine whole process simulation

ClassificationCode：V260.5;TH164;TG386

year,vol(issue):pagenumber：2022,47(9):83-89

Abstract：

In order to improve the aerodynamic performance for new generation of aircraft, the requirements on the surface shape accuracy have been significantly increased, so it is necessary to control the springback of parts after the skin is stretched. Therefore, based on the self-developed domestic skin stretch forming simulation software AISF, the whole process of CNC stretch forming, trimming, springback for the nose cone skin was simulated numerically. Then, the key motion mechanism of VTL1000 CNC skin stretch forming machine was measured, and a finite element simulation model of skin stretch forming considering the actual motion of machine tool was established. Furthermore, the CNC stretch forming code of the actual parts was directly input into the finite element simulation model to ensure that the simulation boundary conditions were completely consistent with the experiment. Considering the actual production conditions, a simulation model of stretch forming-springback-trimming-pressing was established to realize the simulation prediction of springback. According to the optimized CNC stretch forming code, the actual parts were formed and digitally inspected. The results show that the springback prediction is basically consistent with the actual situation, which verifies the accuracy of the finite element simulation model.

Funds：

国家自然科学基金面上项目（52075025）

张贺刚（1978-），男，硕士，工程师 E-mail：hgbox@qq.com 通信作者：李小强（1979-），男，博士，教授 E-mail：littlestrongcn@163.com

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