抄録
In deep drawing, wrinkling and tearing in sheet forming should be eliminated. Blank holder force (BHF) is one of the most important parameters for the successful sheet forming. A high BHF leads to the tearing while a low BHF results in the wrinkling. Variable blank holder force (VBHF) that the BHF varies through the punch stroke is effective to avoid wrinkling and tearing. In addition, initial blank shape is important role for reducing the wrinkling and tearing. In this study, both initial blank shape and VBHF trajectory minimizing wrinkling are determined under tearing constant. In general, the numerical simulation in sheet forming is so intensive that a sequential approximate optimization using a radial basis function network is used to determine them. In the numerical simulation, deep drawing of a cylindrical cup based on NUMISHHET2014 (BM4) is used.
