| 摘要 |
PURPOSE:To manufacture the rough shaped steel billet with good efficiency and yield, by first applying an edging work to a continuously cast slab using a couple or more of work rolls, then by applying a rolling reduction in the thickness direction by a required amount to the middle of breadth of this slab using a properly shaped and sized forging tool, and by successively repeating these works in the longitudinal direction. CONSTITUTION:A slab is subjected to an edging work performed by a couple or more of work rolls. Then, forging and compressing passes are progressively, repeatedly applied to this slab in its longitudinal direction from either one or both of vertical and horizontal directions using a forging tool provided with such an unsteadily rolling part at its longitudinal forefront that the rolling reduction is gradually lessened in the direction of compression and in either one or both of directions perpendicular to this compression, as compared with the rear part; hereby, a hollow part is formed in the middle of breadth of the slab. At the same time, the slab is compressed by the steadily rolling part while said forging and compressing works are performed; these works are progressively repeated and a longitudinally uniform section of rough shaped steel billet can be formed. |
