| 摘要 |
PURPOSE:To prevent the generation of offset of the center of flange. CONSTITUTION:By constituting by arranging a roughing mill group that is constituted of a 1st roughing universal mill 10 which is provided with flat horizontal rolls 11 with which the web part 1w and flange parts 1f of a shape 1 having flange parts 1f and a web part 1w are rolled down in the thickness direction, attached edger roll 20 which is installed behind the roughing universal mill 10 and which is provided with hourglass rolls 21 with which flange edging is possible, 2nd roughing universal mill 30 which is provided with divided horizontal rolls 31 for rolling down the thicknesses of web and flange with freely variable roll width and edger mill 40 which is provided with divided rolls 41 for rolling down a web thickness and edging a flange width with freely variable roll width and leg length and a finishing universal mill 50 which provided with divided horizontal rolls 51 for rolling down the thickness of web and flange with freely variable roll width, expansion rolling or reduction rolling of web height can be widely executed at the same roll chance. |
