深絞り加工における板厚変動最小化を目的とした分割可変ブランクホルダー力の最適軌道設計

抄録

In deep drawing, a low blank holder force (BHF) will cause wrinkling, while a high BHF will lead to tearing. Therefore it is important to determine an appropriate BHF through drawing. Recently, variable BHF (VBHF) which varies through the punch stroke is an attractive approach in the industries. In this study, it is purpose of leading optimum VBHF trajectory that applies on segmented blank holders. The objective is taken as the minimization of the deviation of whole thickness. In general, numerical simulation on sheet metal forming is so expensive that a sequential approximate optimization (SAO) using the radial basis function (RBF) network is adopted. Regarding the optimum solution, numerical simulation is compared to experiment.