Abstract
Investigations have been made on the relationships among the texture, r-value and work hardening exponent n for various tensile directions, grain size and press formability of 2S aluminium and copper. Correlation between the conical cup value and the texture has been obtained. The growth of the cube texture lowers press formability involving drawing and stretch forming simultaneously. However, the difference between Al and Cu cannot be explaind by the texture. Copper, of which the (100)[001] component is stronger than that of aluminium, has much better formability, probably due to the higher work hardening exponent of Cu.
On the other hand, good conformity is shown between the conical cup value and the average value (\barr) or the r-value in the 45° direction. Particularly “r45°” which follows variations of the (100)[001] or (112)[111] component seems to indicate deep drawability of f.c.c. metals which contain (100)[001] as one of the main texture components.
There is a direct relationship between the Erichsen cupping value and the mean work hardening exponent \barn which increases not only with the grain size but with the cube texture. It has been noticed that the cube texture may be desirable for stretch forming, although in such a deformation the work hardening of the textured sheets may be different from that under uniaxial stress.
