JPS5630003A - Manufacture of beam blank for h-beam from flat slab - Google Patents

Abstract

PURPOSE:To omit the blooming pass, and to unexpensively manufacture the titled blank, by employing the two high roughing mill for carrying out the flat edging, the formation of the dog bone shape section, etc., and the finish rolling pass, at manufacturing the beam blank as the material of the wide breadth H-beam from the flat slab. CONSTITUTION:At manufacturing the beam blank 12 for the H-beam possessing the web height larger than the thickness of the slab 7, from the flat slab 7, the two high roughing mill 1 is employed for carrying out the flat edging pass with the box caliber 2 placing vertically the breadth of the slab 7, in order to widen the upper and lower edges' breadth; next, the forming caliber 3 is employed for making the intrusion into the middle of the upper and lower edges; hereby, the dog bone shape billet is prepared. Then, the billet is passed through the second forming caliber 4, the third forming caliber 5, etc., and is formed into the H-shape section; finally, the billet is finished into the desired beam blank 12 by the finishing caliber 6. According to this method, the conventional blooming pass can be omitted, and also, the cost can be greatly reduced because the flat slab is used.