| 摘要 |
PURPOSE:To reducing the building length of rolling installations and to reduce installations for conveying of products in the stage of rolling with plural forward and backward passes of roughing mills by placing a finishing mill sufficiently near the roughing mills and keeping said mill open in the stage of rough rolling. CONSTITUTION:For example, in rolling of H-shaped steel, a finishing mill 25 is provided on a rolling line 26 right after roughing mills 23 consisting of a universal mill 21 for rough rolling and an edging mill 22 for rough rolling. Here, the mill 25 is disposed apart from 23 by the distance l sufficiently shorter than the length of products. A hot saw 27 is disposed apart by a distance L3 from the mill 25. The rolled material which is broken down beforehand is supplied from the upper stream side to the mill 21 by which said material is rolled to a rolled material 7. Right after the same, the mateial is roughly rolled in the end part of flanges with the mill 22. Since the mill 25 is held open in this time, the material is not worked at all with said mill and is carried out to behind said mill. Thereafter the material is fed backward through the mills 22 and 21, to complete 2 passes. After repetition of forward and backward passes, the mill 25 is operated in the stage of final forward pass, by which the final rough rolling and finish rolling are accomplished simultaneously. |
