論文
非軸対称フランジ流入に着目した
可変しわ抑え力分布制御アルゴリズム
可変しわ抑え力分布制御アルゴリズム
—プレス成形におけるしわ抑え力分布知的制御に関する研究 第2報—
2007 年 48 巻 553 号 p. 150-155
詳細
2007 年 48 巻 553 号 p. 150-155
A process control algorithm of blank holder force (BHF) distribution to realize intelligent sheet-stamping in irregular shape stamping is proposed. The development of the algorithm involves the generalization of evaluation functions for detecting the risks of fracture and wrinkling from material flow-in, and simplification by applying a simple BHF control model of a circular-cup deep-drawing process to each cell of the segment blank holder. The architecture of the control algorithm is described for a square-cup deep-drawing process, in which the present algorithm is realized as a fuzzy model for a segmented blank holder. To verify the effectiveness of the algorithm, virtual stamping simulation, in which the BHF distribution of a segment blank holder is controlled by the algorithm, is conducted. From the simulation results, it is found that an appropriate binder force distribution can be obtained. A result of ductile fracture damage estimation using Oyane's ductile fracture criteria shows that the control method can improve drawability as indicated by a previous experiment using a sheet-stamping simulator.
