Abstract
Molybdenum, one of the refractory metals, has high heat and electrical conductivity while remaining strong, mechanically, at high, as well as low, temperatures. Therefore, it is a technologically very useful material, especially for high temperature applications. However, due to its very low drawability, a multi-stage process is necessary to make a deep drawn part from the molybdenum sheet. In this study, a multi-stage circular cup deep drawing process for a molybdenum sheet was designed by including ironing, which was effective in increasing drawability. A parametric study by finite element analysis of deep drawing was conducted to evaluate the effect of die design variables. From parametric study results, the design variables of the multi-stage deep drawing process were selected. Then, nonlinear process optimization, based on finite element simulation, was conducted to obtain the optimum multi-stage deep drawing process, using a global, as well as a local, optimum search algorithm.
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