Abstract
In deep drawing, a low blank holder force (BHF) will cause wrinkle, while a high BHF will result in tearing. The Variable Blank Holder Force (VBHF) approach is attractive approach in the industries, and it is important to design the VBHF trajectory. In this paper, sequential approximate optimization (SAO) approach is employed in order to obtain the VBHF trajectory. The objective is taken as the minimization of the deviation of whole thickness. The constraints are quantitatively defined with the Forming Limit Diagram (FLD), in which no wrinkling and tearing can be observed. The design variables are the blank holder force. Constraints in which the wrinkling and tearing are avoided are introduced in this paper, compared with the related past researches. The Radial Basis Function (RBF) network is employed for the response surface. The validity of the VBHF we obtained with SAO is examined through the numerical simulation.
