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采用极值原理的功能平衡法，确定在三辊Ｙ型轧机上冷轧钢丝时，轧制变形区内金属的三维位移增量和应变增量函数，并依照解出的位移增量和应变增量函数，应用能量平衡原理推导出轧制压力计算公式。经过冷轧钢丝实验，证明理论计算值与实测值较为接近
The function balance method of extreme value principle is used to determine the three-dimensional displacement increment and strain increment function of the metal in the rolling deformation zone when the steel wire is cold-rolled on a three-roller Y-shaped rolling mill. According to the displacement increment and strain increase Based on the principle of energy balance, the rolling pressure formula is deduced. After cold-rolled steel wire experiment, the theoretical calculated value is close to the measured value