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

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... 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.