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管材进行张力减径时,计算某一机架上壁厚变化的理论关系式可概括成下面的一般形式.用它取代相对变形的对数式,计算误差很小.△S=△d(Si_(-1)/di_(-1))A (1)式中:△S和△d——在该机架上管子壁厚和直径变化的绝对量;
When the pipe is tensioned and reduced, the theoretical formula for calculating the wall thickness variation on a certain rack can be generalized to the following general form. The logarithm of relative deformation is used instead of the logarithmic formula of the relative deformation, and the calculation error is very small. ΔS = Δd (Si_ ( -1) / di _ (- 1)) A (1) Where: △ S and △ d - the absolute amount of pipe wall thickness and diameter changes in the rack;