| 摘要 |
PURPOSE:To make the considerable correction in the shape of a rolled material possible by using a stepped backup roll which is cut stepwise in part of barrel length to a tapered shape to a diameter smaller than the central circular cylindrical part and is fitted on the step-cut parts with sleeves shiftable in axial directions. CONSTITUTION:A stepped backup roll 13 is used for the lower roll of, for example, backup rolls 3. The central part of said roll is formed to a circular cylindrical part of barrel width L1. Both end parts are cut stepwise to a tapered shape of the diameter smaller than the diameter of the central circular cylindrical part and decreasing toward the outer side at barrel length L2. Sleeves 14 of barrel width L3 of which the bore has the same taper as the taper in the step- cut parts are installed on said step-cut parts, and the sleeves 14 are shifted nearer the central circular cylindrical part. Then, work rolls 2 are deflected in the direction where the middle of a rolled material rises by the wedge effect of the sleeves 14. If the sleeves 14 are shifted so as to move apart from the central circula cylindrical part, the rolls 2 deflect in the direction where both ends of the matrial 1 increase thickness. |
