Abstract
Developments in the automobile and other sheet metal industries demand continuous improvements in the deep drawing processes. The areas of improving deep drawing processes include higher forming limits so that much deeper products can be obtained with less power consumption. In this paper, the idea of applying hydraulic pressure in the radial direction on the periphery of the blank is theoretically analyzed. This radial pressure is generated due to the punch movement within the fluid chamber and is directed through a by-pass to the blank periphery. The problem is solved for a work hardening material using the finite difference method. The stress and strain distributions in the flange of the shell are determined and the limiting drawing ratio is calculated at the instant when the strain in the thickness direction reaches a critical value. This critical value is assumed to be the strain hardening exponent of the drawn material. The results show significant increase in the limiting drawing ratio as the radial pressure increases.
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