以下为句子列表：
英文: Abstract: This paper analyzes theoretically the effect of the reversed cone angle and length of the plug on restraint and elimination to the distortion of the internal spiral ribs,and put forth the design methods of the plug in drawing rifled tube.
中文: 文摘: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。
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