| 摘要 |
<p>PURPOSE:To control the shape of crown of a plate material to be rolled, by bending the work rolls of a four-stage roll mill consisting of work rolls and back-up rolls in the advancing or reversing direction of the material. CONSTITUTION:In rolling a plate material 10 to be rolled by a four-stage roll mill 12 consisting of work rolls 14 having radius Rw each and back-up rolls 16 having radius RB each; in a state that the axial center of each work roll 14 is shifted within a range of 0.03-0.35 (RW+RB) from a straight line connecting the axial centers of the back-up rolls 16 and 16 in the direction opposite to that of the material advancing or in the normal direction, each work roll 14 is bent in the advancing or reversing direction of the material 10 to change a crown of the work roll 14 by the 1st prescribed quantity determined in accordance with a shifted quantity of the axial center, the sum of RW and RB, a deflection quantity of the work roll 14, as well as, to change a draft of the work roll 14 by the 2nd prescribed quantity determined in accordance with a shifted quantity of the axial center, the sum of RW and RB, and a deflection quantity of the work roll, thereby the shape of crown of the material 10 is controlled.</p> |
