Abstract
In the bulging, the material existing at the flange portion is not drawn into the die opening, and so the contour of a metal sheet does not change. This feature of the bulging is advantageous to producing cups with wide flange. On the other hand, there is a weak point that it is difficult to make cups with large height by the bulging. In this study, in order to improve the bulge height, the method for flowing the material of the flange region to the die hole was examined. A new processing combined bulging, reverse re-bulging and ironing was tried. Variations of thickness strain distribution by each process were measured and the effectiveness of the process was clarified. Finally, it was possible to make a bulged cup about 3.1 times as high as that made by conventional stretching.
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