| 摘要 |
<p>PURPOSE:To eliminate dead time by inserting and holding the object of rolling between rolls at a prescribed rolling load and setting zero point of drawing down position base on the rolling load and the characteristic value of the object of rolling. CONSTITUTION:A steel sheet 3 as the object of rolling is fed between both rolls and simultaneously rolling is started. When the rolling load reaches a prescribed value by usual feedback control, a value of reference is set on the indicating position as zero point of indication of drawing down position. Next, the indicated value is changed into a value corresponded to a gap between the rolls that is estimated based on the kind of the steel sheet as the object of rolling. Consequently, at the time of roll change or the like of rolling mill, zero point adjustment of indication of the screw down position of roll can be executed without scratching the roll and without accompanying dead time so much.</p> |
