A new generalized method for calculating the rolling radius is developed. It is based on an analysis of the real shape of the neutral line in the deformation zone provided that the workpiece in equilibrium under the forces applied to it. It is established that there can be four characteristic positions of the neutral line within the contact surface between the roll and the workpiece. The particular case where the neutral line lies in a plane parallel to the rolling axis and the calculated rolling radius is effective is considered. The actual and effective rolling radii in the case of plugless rolling of pipes in oval roll passes are calculated and compared. A best-fit formula for correcting the calculated values of the effective rolling radius is obtained.

开发了一种新的通用计算滚动半径的方法。它基于对变形区域中性线实际形状的分析，条件是工件在施加到其上的力下处于平衡状态。已经确定，在辊与工件之间的接触表面内，中性线可以有四个特征位置。考虑中性线位于平行于轧制轴线的平面中并且所计算的轧制半径有效的特定情况。计算并比较了椭圆形轧道中管的无塞轧制时的实际和有效轧制半径。获得用于校正有效滚动半径的计算值的最佳拟合公式。