スプリングバック抑制を目的としたブランク形状の検討と可変ブランクホルダー力とブランク形状の最適化

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<p>High tensile strength steel is very attractive because of its light weight and high strength. Therefore, it is being used for automotive frame parts. However springback is remarkably generated in sheet metal forming, and it is difficult to obtain a desired shape. In addition, wrinkling and tearing easily occur due to the low formability. The variable blank holder force (VBHF) which the BHF varies through the stroke and blank shape have direct influence on the springback, the wrinkling and the tearing. This study proposes a method to determine the optimal VBHF and blank shape for decreasing the springback. Both the torsion angle of top of the product surface and the flange angle are evaluated for springback. The numerical simulation is so intensive that a sequential approximate optimization using radial basis function network is adopted to determine the optimal VBHF trajectory and blank shape. Through the numerical simulation, the validity of the proposed method is confirmed.</p>

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