适当简化三辊穿孔机穿孔变形过程(只有轴向和径向应变的平面应变),将穿孔变形区分成4部分,建立各变形区的速度场,用上限法解析各变形区的变形功率,并根据轧制力所做的功率等于各变形区消耗的功率之和求出轧制力。实例说明,对于径壁比大于10.0的薄壁管,采用该方法计算的理论值与实测值相对误差较小,可在实际工程中应用。 The perforation deformation process (only the plane strain of axial and radial strain) is simplified properly, the perforation deformation is divided into four parts, the velocity field of each deformation zone is established, and the deformation power of each deformation zone is analyzed by the upper bound method According to the power of the rolling force is equal to the sum of the power consumed by each deformation zone, the rolling force is obtained. The example shows that the relative error between the theoretical value and the measured value calculated by this method is small for thin-walled tubes with diameter-to-wall ratio greater than 10.0 and can be applied in practical engineering.