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拉拔管材时道次延伸系数的取值范围,在有关手册或专业教材中都能找到。可是在落实具体的拉管配模(含衬芯)工艺时,常常使人为难。因为延伸系数λ,是管子外径D和壁厚S的函数。缺少经验的工艺人员往往掌握不好减径量ΔD和减壁量ΔS的搭配关系。为此,作者设计了一种近似计算方法,可以迅速掌握设计拉拔管材的工艺流程。设外径减缩系数K_D和壁厚减缩系数K_S分别定义为:K_D=D_0/D_H和K_S=S_0/S_H,式中D_O、S_O和D_H、S_H分别为拉拔前和拉拔后的管子外径、壁厚。道次延伸系数λ与K_D和
The range of value of the extension coefficient when drawing pipe can be found in the relevant manual or professional teaching materials. However, in the implementation of a specific pull tube with mold (including lining core) process, often makes it difficult. Since the extension factor λ is a function of the tube outside diameter D and the wall thickness S, Lack of experience of the process staff often grasp the combination of bad reduction ΔD and reduction of the amount of ΔS. To this end, the author has devised an approximate calculation method that quickly grasps the process of designing drawn tubing. The outer diameter reduction coefficient K_D and the wall thickness reduction coefficient K_S are respectively defined as: K_D = D_0 / D_H and K_S = S_0 / S_H, where D_O, S_O and D_H, S_H are the outer diameter of the pipe before and after drawing , Wall thickness. The pass extension coefficient λ and K_D and