| This thesis is an experimental investigation into how the parameters of rolling speed and percentage reduction affect the amount of 'curl' in dry, cold-rolled aluminum billets. Curl is defined as the deviation in flatness in a billet when laid widthwise on a flat surface. A parameter called curl ratio (C;The experiments into the effect of roll speed on curl in rolling while maintaining a constant reduction of area showed definite patterns in curl. In all cases, an increase in roll speed resulted in a change in curl ratio, C;Experiments were also undertaken into the effect of a change in reduction while maintaining a constant roll speed. At low reductions, severe turn-up was observed, and at high reductions, severe turn-down was observed. Four different speeds were investigated. (Abstract shortened by UMI.)... |
