ROLLING METHOD OF ROUGH SHAPE BILLET FOR SHAPE STEEL

摘要

PURPOSE:To produce a rough shape billet for a large-sized H-beam with single heat rolling in the stage of rolling the rough shape billet for an H-beam or I- beam from a flat slab by providing projecting parts for wedging in the roll collar parts between box calibers for edging the slab. CONSTITUTION:A split caliber K- I having projecting parts 10 for weding of a V-shaped section, box calibers K-II, K-IV having successively increasing caliber width and a final caliber K-V are formed to the rolls of a breakdown mill and further a split caliber K-III of which the roll collar parts between the box calibers K-II, K-IV are made into projecting parts 11 for wedging of a V-shaped section are superposedly formed with the calibers K-II and K-IV in the stage of rolling a rough shape billet for an H-beam or I-beam from a flat slab 1 with the breakdown mill. A wedge-shaped split groove 12 is formed by the caliber K- I to the slab 1 heated to a prescribed temp. The groove 12 is expanded by the K-III to 14 and in succession the groove 14 is pushed and expanded by the K-II and K-IV until said groove is flattened, by which a rough shape billet 2 for the H-beam and the I-beam is manufactured.