| 摘要 |
PURPOSE:To prevent the abnormal deformation of a material to be rolled formed in case of blooming rolling, by constraining the left and right flanks of the material to be rolled by the side taper portions or roll kalibers up to a final pass from an initial pass. CONSTITUTION:Kalibers I, II for an initial pass and the next pass with wide kaliber width are mounted to both sides of rolls of roll kalibers and kalibers III, IV, V with narrow kaliber width are disposed to a center portion. Kaliber I steel ingot a for initial pass is rolled and changed into a steel piece b, further turned and rolled to a steel piece c, and rolled to a steel piece d by a kaliber 2. The steel piece d is rolled to steel pieces e-f by the kalibers III, IV, V at the center portion, and rolling reduced to a fixed section dimension. In this case, since the left and right flanks of a material to be rolled are constrained by the side taper portions of the roll kalibers up to the final pass, the steel pieces are equalized, thus stably obtaining a rolling material that there is no defect on its surface and its quality is excellent. |
