通过实验研究，介绍了翻管的变形特征（翻管力恒定、壁厚基本不变），导出了利用圆角翻管模外翻管时的变形力Ｐ与模具最佳圆角半径ｒｉ的关系式，论述了翻管时模具圆角半径、摩擦系数和变形速度对翻管变形力的影响。所得的结果，与实验值吻合良好，可供制订翻管工艺和模具设计时参考。 Through the experimental study, the deformation characteristics of the flip pipe are introduced (the flip force is constant and the wall thickness is basically unchanged), and the relationship between the deformation force P and the optimum die radius ri when the flip pipe is flipped This paper discusses the effect of mold fillet radius, friction coefficient and deformation speed on the deflection of flip pipe during turn over. The results obtained, in good agreement with the experimental values, can be used for reference in formulating the flip-up process and the mold design.