| 摘要 |
PURPOSE: To obtain a forming caliber by which a crude slab having a high dimensional accuracy is manufactured by taking the length of parallel parts in the web pressing parts of the forming caliber as a specified range that is determined from the shapes of a material to be rolled after the completion of rolling and after desired forming rolling. CONSTITUTION: In the forming caliber used at the time of forming the crude slab for shapes by forming and rolling the slab having a rectangular cross section, the length Lw of the parallel parts in the web pressing parts is set to the range derived by the expression. In the expression, A0 is the cross-sectional area after the completion of edging/rolling, two is thickness of the part equivalent to the web after the completion of edging rolling, twn is thickness in the web part of the desired crude slab andαis a constant and 0.8<=α<=1.2. The width of the caliber equivalent to the tip of flange parts of the crude slab of the forming caliber is set in the vicinity of the length that the thickness at the tip of the flange of the crude slab after the completion of forming rolling is multipled by the square root of the ratio of the area of the flange part of the crude slab to the area of the flange part of the material to be rolled after the completion of eEdging rolling.
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