拉伸外翻可以克服轴压失稳、翻管件尺寸精度不理想等问题。本文采用Deform-2D商业软件对铝合金圆管拉伸外翻成形过程进行数值模拟,观察了成形过程中材料流动情况和等效应力的分布,分析了管坯相对厚度和凸模圆角半径对翻管工艺力的影响。结果表明:翻卷过程中金属材料以较大的速率从内孔内壁流向凸模圆角处,并在凸模圆角入口处速度达到最大值;外筒外壁处材料处于等效拉应力状态,而内孔内壁处材料等效应力基本为零;对于几何尺寸规格一定的管坯,存在一个最佳拉伸外翻凸模圆角半径,当设计的凸模圆角半径等于该最佳值时,翻管工艺力最小。 Stretching eversion can overcome the instability of the axial pressure, turning the pipe parts dimensional accuracy is not ideal and so on. In this paper, Deform-2D commercial software was used to simulate the process of stretch tube outgrowing of aluminum alloy tube. The distribution of material flow and equivalent stress during the forming process was observed. The relative thickness of the tube and the radius of punch fillet The influence of flip technology. The results show that the metal material flows from the inner wall of the inner bore to the corner of the punch at a large rate and reaches the maximum value at the entrance of the punch fillet. The material at the outer wall of the outer cylinder is in an equivalent tensile stress state. The equivalent stress of the material inside the inner hole is almost zero; for the tube blank with a certain geometrical dimension, there exists a radius of radius of the best stretching eversion camber, when the radius of the convex punch of the design is equal to the optimum value, Flip pipe technology is the smallest.