CROSS ROLLING DOWN METHOD FOR HOT SLAB BY PRESS

摘要

PURPOSE:To improve the width accuracy of a slab by providing side guides to the upper stream on the inlet side of dies and cross rolling down the front end of the slab then cross rolling down the unrolled down part at the rear end of the slab after centering with the side guides. CONSTITUTION:The side guides 5 are installed to the paper stream side of an inlet side roller table 3 of the dies 1 and the slab 4 is first continuously cross rolled down from the front eend thereof up to a prescribed length. The space between the dies 1 is then expanded and the slab 4 is advanced. The rolling down gap of the dies 1 is adjusted in the prescribed position and the rear end of the slab 4 is subjected to preforming. After the dies 1 are expanded in succession thereof, the slab 4 is retreated and is subjected to centering by the side guides 5, then the rear end is cross rolled down. The generation of a center deviation of the slab 4 and the step in the longitudinal direction thereof is prevented by the above-mentioned method. The accuracy of the finish width of the slab 4 is thus improved.