实验表明，直径缩小量随减径量和模角的增大而增大；
The experiment shows that the magnitude of dia. sinking is increased with the increase of reduction and die entry angle;
对刚塑性有限元计算的结果与试验结果进行比较，并提出缩口的最佳模角。
The theoretically calculating results are compared with those of experiment and the optimum die Angle in nosing process is proposed.
研究了不同变形量、钢种、硬化程度、模角和拔制速度对空拔管直径缩小量的影响。
The effects of various amounts of deformation, steel grades, degrees of hardenability, die entry angle and drawing speeds on dia. sinking drawing are studied.
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