Abstract
This paper describes the effect of the multi-axial loading path on limiting drawing ratio (LDR) at a square cup deep drawing of thick plate using a punch and four side-tools. The previous study showed that larger LDR was obtained by the multi-axial loading than the conventional method, but if the loading would be achieved following the appropriate loading path, the LDR would be improved further. The multi-axial loading path, taking the movement of the blank side during the drawing process into consideration, is significant to obtain a larger LDR. In this paper, the movement of the blank side is investigated by the experiments, the FEM analysis and the calculation using the simplified model. Then the multi-axial loading paths considering the movement of the blank are designed. The experimental results show that those appropriate multi-axial loading paths provide a considerably larger LDR improving about 55% than the conventional method.
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