Abstract
Friction aided deep drawing has been investigated to confirm the possibility of the deep drawing of square cups. A blank holder is divided into eight segments and these segments are used instead of the conventional blank holder. These segments of the blank holder can move radically inwards and outwards depending on the blank holding pressure. When an axially punch is used together with this deep drawing process, the drawing force decreases and also the shape and dimensional accuracy can be improved. In the square deep drawing, the deformation aspect varies from portion to portion; at the punch corner and at the straight flange portion. Experimental results show that the metal flow at the corner and at the straight f1ange portion is approximately uniform. The square cups of 60 mm height, which is 2.3 times of the side length, can be obtained from a circular blank of 120 mm diameter and 0.5 mm thickness. The number of moment of radial direction of the blank holding segments was 44 times.
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