| 摘要 |
PURPOSE:To prevent generation of defective products and to improving rolling efficiency by subjecting a slab-shaped billet having the optimum thickness conforming the flange thickness of a rough H-shaped billet as a stock to edging. CONSTITUTION:The slab-shaped billet having the thickness t0 satisfying the conditions expressed by the equation according to the required flange thickness tF and rolling conditions, etc., is used as the stock at the time of molding the rough H-shaped billet. The slab-shaped billet is subjected to the edging in the transverse direction to form a dogbone-shaped material and thereafter, said material is rolled by caliber rolls for molding to the rough H-shaped billet. The caliber design and rolling conditions in molding and rolling are optimized by selecting such slab-shaped stock, by which the increase in the number of passes in the molding and rolling is prevented. |
