| 摘要 |
PURPOSE:To improve product quality and roll life by providing an area having a specifically high longitudinal elastic modulus on the outside periphery in the circular columnar part of a back up roll and positioning the end in said area toward the inside by a prescribed length from the end of a rolling stock then rolling the stock. CONSTITUTION:The back up roll 1 is constituted of the circular columnar part 11 and a tapered part 12 and is formed with the high longitudinal elastic modulus part 13 which has a prescribed thickness h1 and, the longitudinal elastic modulus E of which has >=30,000kgf/mm<2> value on the outside periphery of the circular columnar part 11. Rolling is executed by positioning the ends of the high longitudinal elastic modulus parts 13 of the roll toward the inside by the prescribed length l1 from the respective transverse ends of the rolling stock 3. Tapered parts 12 are relatively flatly deformed and the high longitudinal elastic modulus part 13 has the small flattening deformation. The spacing of the roll 2 near the ends of the rolling stock 3 is, therefore, increased, by which crowns and edge drops are decreased. The product quality and the life of the rolls 1, 2 are thereby improved. |
