Abstract
Experimental equipment used to assess the tool-workpiece compatibility in deep drawing is designed and built. In this construction, a die is divided into two coaxial parts and the one with die profile radius can be rotated so that the meridian component of frictional force reduces with increasing its peripheral velocity. A sophisticated procedure, which clarifies contact ratio and frictional shearing stress in the tool-workpiece interface using experimental results and theoretical relationships, is introduced. By means of experimental drawing of copper and stainless steel sheets with three kinds of die materials (carbide, die steel, and aluminum bronze), the response of the contact ratio and frictional shearing stress to changes in blank holding force, drawing ratio and ironing ratio, is evaluated. Consequently, a deeper understanding of the phenomenon acquired, and it is confirmed that the contact ratio and the frictional shearing stress behave independently to determine the tool-workpiece compatibility.
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