Abstract
In sheet metal forming, it is well known that blank holder force (BHF) has a direct influence on the product quality. A high BHF causes tearing, while a low BHF leads to wrinkling. Therefore, it is important to determine an appropriate BHF through sheet metal forming. Recently, variable BHF (VBHF) approach which BHF varies through the punch stroke has received a lot of attention, and the validity is discussed. This approach can control the material flow into the die, and the product quality is then improved. In this study, optimal VBHF minimizing tearing and wrinkling is determined. Numerical simulation in sheet metal forming is so intensive that a sequential approximate optimization (SAO) using the radial basis function (RBF) network is adopted to explore the optimum solution.
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