| 摘要 |
PURPOSE:To omit the blooming work, and to manufacture the shape steel with the specified sectional shape, by applying the universal rolling work to the intermediate billet of the dog bone section obtained by hot forging the plate slab in the breadth direction. CONSTITUTION:The plate slab 30 of a flat, rectangular section being heated in the heating furnace 12, is forged from the left and the right sides in the breadth direction with the pushers 36, using the hot forging machine 14 arranged in front of the breakdown mill 16. Hereupon, since the deformation of the slab 30 is restrained from upside and downside by the web pressing jigs 32, the buckling of the slab 30 is prevented, and the metal of the slab's lateral edges is permitted to move into the free space; hereby, the intermediate billet 38 of the dog bone section is prepared. Next, this billet 38 is subjected to the conventional rolling mill group consisting of the breakdown mill 16, the roughing universal mill 18, the edging mill 20 and the finishing universal mill 22; hereby, the H-beam of the specified sectional shape is manufactured. |
