| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a product having different flange widths from rough shape billets having the same shape with respect to a wide-flange shape and shapes similar to that by reducing the flange width of a rough shape billet after rolling for forming to the flange width corresponding to the shapes having different sizes by greatly edging the flange width by edger rolling in a rough rolling stage. SOLUTION: The rough shape billet 31 having the flange width of leg length Ho which is rolled with a forming mill on the hot rolling line for manufacturing the shapes is greatly reduced to a leg length He corresponding to the different size in the rolling stage with a universal roughing mill group consisting of a universal mill and edger and the flange width of the rough shape billet is reduced. For example, using rolls for forming the rough shape billet in the forming mill, the rough shape billet 31 for the wide flange shape of H600×300 is rolled into the leg length Ho and, next, the flange width is greatly reduced into the leg length He equivalent to H600×250 with the edger in the rough universal rolling stage and, after that, the universal rolling is executed and the product of H600×250 is obtained. |
