| 摘要 |
PURPOSE:To improve the product yield by edging a metal slab by a max. edging draft amount at the biting end and then edging with a drafting amount reduced by a drafting allowance amount and then edging the runout end part by a draft reduced by a drafting amount shown by a prescribed equation. CONSTITUTION:At edging a biting end 2 of a metal slab 1, edging with a max. drafting amount Hmax. is performed. A central part except the part 2 is edged by a drafting amount H found by subtracting a draft margin amount h from the max. drafting amount Hmax. Then, the drafting amount H is gradually reduced as an edging point approaches to the runout end and edging at the runout end part is performed by a drafting amount obtained by further subtracting a drafting amount shown by the equation I from the amount H. Thus, a crop loss is remarkably reduced because a width of the slab 1 after edging is held to be constant. Therefore, the product yield is improved. |
