| 摘要 |
PURPOSE:To avert decrease in elongating efficiency which may arise from a change in the space between split rolls movable in the axial direction thereof with a titled method having the stage of rolling with said rolls by rolling the web part with primary and secondary universal roughing mills. CONSTITUTION:A breakdown rolling mill 12, primary and secondary universal roughing mills 14-1, 14-2, an edger rolling mill 16-1 and a universal finishing mill 18 are disposed in order shown in the figure. A web and flanges are rolled by tapered horizontal split rolls 26 having about 5 deg. flange surface of the material and vertical rolls in the mill 14-1 and the central part of the web is held in the non-rolling down state. The flange ends are rolled by horizontal split rolls 28 tapered to about 5 deg. in the mill 16-1. The unrolled down part at the center of the web is rolled by stationary rolls 30 of the mill 14-2 and partial rolling of the web ends and flange rolling are accomplished by horizontal split rolls 32 tapered to about 5 deg. and vertical rolls. Rolling by said three units is repeated to roll down the material. |
