| 摘要 |
<p>PURPOSE:To exactly adjust the amount of bending and to improve the capacity of shape correction by bending intermediate rolls in accordance with the difference between elongations in the middle part and end parts and bending work rolls in accordance with the rate of change in the width direction of elongation in the ad parts. CONSTITUTION:This method is a control method of a multi roll mill 10 for controlling the shape of a rolled stock W by using the multistage rolling having a pair of upper and lower work rolls 11, 12, intermediate rolls 13, 14 and back-up rolls 15, 16 and adjusting the amount of bending of the intermediate rolls and work multistage rolling. The elongations in the longitudinal direction in the middle part and end parts in the width direction of this rolled stock are respectively measured and the intermediate rolls 13, 14 are bent in accordance with the difference between elongations in the middle part and end parts. And the work rolls 11, 12 are bent in accordance with the rate of change in the width direction of the elongation in the end parts. In this way, it is not necessary to express the elongation distribution of the rolled stock by a high-order polynomial, then, shape measuring points are reduced, so control operation speed is quickened and control is simple, so control operation is quickened.</p> |
