| 摘要 |
<p>PURPOSE:To greatly reduce production cost by selecting a target sheet bar width based on a slab width and setting vertical roll divergence at the target sheet bar width. CONSTITUTION:In roughing of the slab 1 by a roughing mill group 3, the entering quantity of edge seam corresponding to kinds of steel, width and thickness of a product and a relation of the slab width before roughing against the target sheet bar width are determined beforehand by a function or a table. Based on the width of the slab 1 that is measured (by a width meter 9) or calculated before roughing, the target sheet bar width is selected in a range in which the entering quantity of the edge seam is not more than the excess width of a hot rolled coil 7. The divergence of the vertical roll 4 is set at the target sheet bar width thus selected. Consequently, the problem of the short width in the product due to shearing off of the edge seam part is eliminated.</p> |
