| 摘要 |
PURPOSE:To effectively manufacture an H-shape steel by performing flange angle raising, web height drafting, and flange thickness drafting for a shaped bloom having roughly rolled flanges and a web by a universal rolling mill provided with horizontal rolls and vertical rolls. CONSTITUTION:A breakdown rolled shaped bloom is rough rolled and then finish rolled by a universal rolling mill provided with a pair of vertical rolls V standing at the right and left sides of the pass line of a steel bloom and a pair of horizontal rolls H whose roll width is changeable and is set to a width value narrower than a width in rough rolling stage. In rough universal rolling stage, the bloom is subjected to usual rolling; in finish universal rolling stage, a rolling mill, in which an outside width dimension (a) of the pair of the width changeable horizontal rolling rolls H is adjusted to a web dimension W of a target H-shape steel, is used. Flange angle raising, web height drafting, and flange thickness drafting for the bloom are performed to from an H-shape steel having a constant web height. Thus, an H-shape steel whose web height is nearly constant is effectively manufactured without changing rolls. |
