| 摘要 |
<p>PURPOSE: To minimize the suspension of operation of a rolling mill and to accurately control the crown and shape of a steel strip by changing a pair cross roll angle when control into a prescribed crown and shape is impossible by work roll bending control. CONSTITUTION: In a hot finishing mill consisting of pair cross rolling mills for the stands 11-13 of the prestage and ordinary rolling mills in the stands 14-17 of the poststage, the amount of crown, thickness and width of the succeeding material are inputted to an arithmetic and control unit 21 for crown and the pair cross angle of the stand of the prestage for rolling the succeeding material and the amount of work roll bending of the stand of the poststage are determined by a prescribed calculating formula. The pair cross angle, amount of work roll bending and each roll gap in the prestage are inputted to the arithmetic and control unit 21 for crown and whether the set change of the pair cross angle is necessary or not is decided by comparing them with the arithmetic results of the succeeding material. The results are respectively inputted to pair cross angle setting mechanisms 31-33 of the stands 11-13 of the prestage, as necessary, the operation of the rolling mill is suspended and pair cross angle sitting is changed by set change.</p> |
