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采用极值原理的功能平衡法，确定短芯棒拔管变形区内金属的位移增量函数，并依此建立拔制力计算模型。经与实验结果比较，理论计算值与实测值较为接近，此方法可以在工程计算中应用。
The function balance method based on the extremum principle is used to determine the incremental function of the displacement of the metal in the deformation zone of the short mandrel extubation and to establish the calculation model of the pulling force. Compared with the experimental results, the theoretical and measured values are close, this method can be applied in engineering calculation.