Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 12    December 2010

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Optimization on springback reduction in cold stretch forming of
titanium-alloy aircraft skin
HE De-hua(何德华), LI Dong-sheng(李东升), LI Xiao-qiang(李小强), JIN Chao-hai(金朝海)

School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China

Abstract:An optimization method was presented for cold stretch forming of titanium-alloy aircraft skin to determine process parameters and to reduce springback. In the optimization model, a mathematical formulation of stress difference was developed as an indicator of the degree of springback instead of implicit springback analysis. Explicit finite element method (FEM) was used to analyze the forming process and to provide the stress distribution for calculating the amount of the stress indicator. In addition, multi-island genetic algorithm (MGA) was employed to seek the optimal loading condition. A case study was performed to demonstrate the potential of the suggested method. The results show that the optimization design of process parameters effectively reduces the amount of springback and improves the part shape accuracy. It provides a guideline for controlling springback in stretch forming of aircraft skin.


Key words: titanium alloy; aircraft skin; stretch forming; springback; optimization

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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