Examination of some processing variables to improve the press-formability of aluminium sheets

The effects of some processing variables, the surface-friction during cold-rolling, the skin-pass reduction, and the annealing condition prior to cold-rolling, to improve the press-formability of commercially pure aluminium sheets (JIS-A, 1050) are examined. The high-friction cold-rolling is not a rewarding process to improve the press-formability of aluminium sheets. However, some increase in the r-value may be expected when high-friction is applied during a final moderate reduction. Aluminium sheets heavily cold-rolled directly after hot-rolling applying good lubricating condition and then fully annealed, possess the optimum press-formability among other sheets similarly processed but subjected to different annealing conditions at the intermediate stage between the hot-rolling and cold-rolling processes.