| 摘要 |
<p>PURPOSE:To control a plate shape without any complicated corrective counting by applying a resultant value consisting of the optimum work roll bending force when a work roll is not cooled for a next operation and a corrective quantity when the work roll is cooled and not in motion to a setting value for an actual roll bending force. CONSTITUTION:Just before the last pass of rolling is finished, an optimum work roll bending force WRB for the next pass is required when the roll 12 is not yet cooled and the optimum corrective quantity of bending force DELTAWRB1 after the roll 12 is cooled for a fixed time is stored in a computer regarding material, plate width, plate thickness and draft. A bending corrective quantity DELTAWRB1 is corrected by a work roll cooling time t1 and a bending correction curve 18 to obtain the next corrective quantity dWRB1. DELTAWRB1 shows the correction for coolant and DELTAWRB2 shows the correction for air cooling. WRB and dWRB1 or dWRB2 are synthesized and the synthesized value is given as a preset value to a bending control device 16 to move a bending device 14.</p> |
