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从理论上分析了芯棒倒锥角和芯棒长度对内螺旋凸筋形状畸变的抑制和消除作用，提出了采用倒锥形等螺距芯棒拉拔内螺纹管时芯棒几何参数的设计方法
From the theoretical analysis of mandibular reverse taper angle and mandrel length on the inhibition of spiral rib shape distortion and elimination, put forward the use of reverse taper equal pitch mandrel drawn mandrel geometry design method