Discussion of Deep-Drawability of Commercially Pure Aluminum Square Cups. Combined Effects of Forming Conditions and Estimation of Deep-Drawability.

Abstract

The combined effects of the forming factors on the deep-drawability of square cups were studied. Blank shapes, tool shapes and blank materials were used as the forming factors. The circumferential distribution of meridian tensile stresses along the contour of a square cup during deep-drawing highly influenced the deep-drawability and was related to fracture types of drawn cups. Several characteristic lines for fracture forces and drawing forces were used to estimate the deep-drawability. The force lines, which were found in the figures of the relationship between fracture forces, drawing forces and blank shape, were affected by the blank materials and tool shape. The combined effects of the forming factors on the deep-drawability were characterized by these lines. The constant fracture force and the transition fracture force could be a measure of possible improvement for deep-drawability.