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通常,在孔型设计中必须准确估计宽展。计算宽展的公式有30多个,分为以下四种典型形式:(1)Δb=C_1·l·lnH/h(2)Δb=C_2·l·(?)((Δh)/H)(3)Δb=C_3·l·(?)((Δh)/h)(4)Δb=C_4·l·(?)((Δh)/H、(Δh)/h)式中Δb——绝对宽展,毫米;C_1、C_2、C_3、C_4——系数;l——接触弧长的水平投影,l=(R·Δh)~(1/2),毫米;R——轧辊半径,毫米;H、h——该道次轧件轧前及轧后高度,毫米;Δh——绝对压下量,毫米。后三种型式中都有相对压下量的函数式。对于孔型设计人员来说,最简单、最实用的是第二种,即:
In general, wide-spread must be accurately estimated in the pass design. There are more than 30 formulas for calculating the spread, which are divided into the following four typical forms: (1) Δb = C_1 · l · lnH / h (2) Δb = C_2 · l · (Δh) / H) (4) Δb = C_4 · l · (?) (Δh) / H, (Δh) / h) where Δb = absolute width Show, mm; C_1, C_2, C_3, C_4 - Coefficients; l - Horizontal projection of contact arc length, l = (R · Δh) ~ (1/2), mm; R - Roll radius in millimeters; H , H - the pass rolling mill before and after rolling height, mm; Δh - absolute reduction, mm. The last three types have a relative reduction of the function. For the hole design staff, the simplest and most practical is the second, namely: