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应用流函数法建立减径拔管的动可容速度场，用上限原理得出减径拔管的上限解，分析了摩擦状态、变形程度及相对壁厚等工艺参数对拉拔载荷的影响，从而得出最佳工艺参数。
The flow capacity method was used to establish the moving rate field of the reduced-diameter extubation. The upper limit solution of the reduced-diameter extubation was obtained by the upper limit principle. The influence of the process parameters such as friction state, degree of deformation and relative wall thickness on the drawing load was analyzed. In order to draw the best process parameters.