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采用极值原理的功能平衡法．确定挤压变形区内金属的位移增量，并依此建立挤压力计算模型。此方法供工程设计参考。
Functional balance method using extreme principle. Determine the displacement of metal extrusion deformation increment, and to establish a calculation model of extrusion pressure. This method is for engineering design reference.