研究表明,影响空拉管壁厚变化的因素应是管坯的径厚比(D_H/S_H)以及相对拉伸应力。在生产条件下考虑两者联合影响所得到的临界系数D_H/S_H≈3.6—7.6,远比人们所沿用的D_H/S_H=5—6的范围宽。同时,从理论与实践两方面研究了诸如材质、道次变形量、拉伸道次、润滑、拉速以及模子参数等工艺条件对空拉管壁厚变化的影响规律,结果表明,它们都是通过改变K值而起作用的。本文得出了可用于生产、有较高精度的空拉管壁厚变化计算公式及曲线。
The ratio of tube diameter to wall thickness and the relative drawing stress were believed to be the factors in wall thickness change of sinking tubes. The critical coefficient, about 3.6—7.6, obtained in both consideration of mentioned factors together is wider than that, about 5—6, conventionally used in the production practice. The effect of the process conditions, such as: properties of material, reduction in each pass, total elongating passes, lubricating conditions, drawing speed, geometric parameters of die, etc. on the wall thickness change of sinking tubes has also been investigated theoretically and experimentally. It was shown that they attributes their functions to the variation of value of relative drawing stress from which the accurate caleulational formula and plot in estimation of wall thickness change are given for industrial production.
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