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Abstract：
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For an automobile front door inner panel of differential thickness blank, in order to solve the crack and wrinkle defects in the drawing process, firstly, the mechanical properties of differential thickness blank were tested, the similar mechanical properties of thick blank and thin blank with the same material were obtained, and the yield strength and the tensile strength of tailor welded blank were higher than that of base material. Then, according to the characteristics of parts, the addendum surface was designed, and the finite element model of drawing for differential thickness blank was established by finite element software AutoForm. Through the preliminary analysis, the process incision was introduced to solve the forming defects, and the blank-holder force of drawing, the protruding height of piercing knives C1 and C2 and the friction coefficient were optimized by the method combinated the orthogonal experiment design, the numerical simulation and the multi-objective optimization. Furthermore, the optimum combination of process parameters is the blank-holder force of 1.1×106 N, the protruding height of 12 mm for the piercing knife C1, the protruding height of 8 mm for the piercing knife C2 and the friction coefficient of 0.125. Finally, the optimized parameters were verified in the experiments. The results show that the experimental results of differential thickness blank obtained by drawing and the numerical simulation results are basically consistent.
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Funds：
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重庆市教委科学技术研究项目（KJQN201801228）；重庆市自然科学基金资助项目(cstc2019jcyj-msxmX0505)
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AuthorIntro：
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王辉(1989-)，男，博士，讲师，E-mail：wanghui@sanxiau.edu.cn
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Reference：
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