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内螺纹管拉拔过程中内螺旋凸筋的畸变是由于已形成的凸筋侧壁在过大的侧向力或侧向 位移的作用下引起的，本文从理论上分析了内螺纹管产品几何尺寸和工艺参数对畸变的影响，并对 芯棒与凹模的轴向相对位置对内螺纹管拉拔成形质量的影响进行了研究．
Internal thread tube drawing process spiral rib distortion is due to the convex side wall has been formed under the effect of excessive lateral force or lateral displacement caused by this article from a theoretical analysis of the product geometry Size and process parameters on the distortion, and the mandrel and the die axial relative position on the quality of the internal thread drawing forming were studied.