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翻译 原文 Blank design and formability prediction of complicated progressive die stamping part using a multi-step unfolding method Zhang Zhibing, Liu Yuqi,Du Ting,Li Zhigang State Key Lab of Material Processing and DieMould Technology,Huazhong University of ScienceTechnology, Wunan,Hubei 430074,China a r t i c l e i n f o Article history: Received 17 March 2007 Received in revised form 12 July 2007 Accepted 24 November 2007 Abstract A multi-step unfolding method (MSUM) is developed for blank design and formability prediction of complicated progressive die stamping part .In the method ,a finite element model of the inverse approach(IA)is developed at a local area according to the stamping process, and the intermediate shape is unfolded on a reference surface at the local area .Not only the influence of the connection ,blank-holder force and the friction ,but also the influence of the offsetting of the strain neutral layer with different radius of curvature at local area, are considered in the model ,which improves the calculation precision of the blank shape at each step .The key intermediate blank shapes and initial blank shape can be generated using the method with many times in an inverse sequence .The optimum blank shape also can be designed according to the formability of the forming part .The MSUM is illustrated to the blank design of a progressive die stamping part ,and a benchmark test is compared with experimental and other numerical results. Keywords: Blank design Progressive die Multi-step unfolding method Inverse approach 1.Introduction A large number of parts on automobile body are deformed by stamping ,and sometimes the features of the stamping parts are very complicated .In order to improve the quality and the efficiency of products ,many parts are formed using progressive die process .Comparing with simple press tool, progressive die has the advantages of high quality and efficiency of product ,which is especially suitable for large-lot producti