| 摘要 |
PURPOSE:To obtain a slab having a plane shape excellent in its end shape by making the distance between anvils larger than a prescribed minimum distance only for the vicinity of the rear end of a slab, to roll the slab in its width direction, before rolling the slab into a target slab-width by using the vertical rolls of a roughing mill. CONSTITUTION:A slab 1 having an original width WS is rolled in the width direction from its front end through the minimum opening W of anvils 4 by continuously opening and closing the anvils 4 provided to a press device with the aids of hydraulic cylinders 5, and lastly the slab 1 is rolled in the width direction by making the minimum distance W' larger than the minimum distance W only for the vicinity (l) of the rear end of slab 1. Thereafter, the slab 1 having the width W' a little larger than the prescribed slab width W only for the length (l) of the rear end-side, is passed through the vertical rolls of a roughing mill to roll the slab 1 into the uniform target slab-width W. In this way, the slab 1 is subjected to heavy rolling reduction continuously throughout its whole length, to obtain a slab excellent in plane shape. |
