在国内外有关轧制理论的文献中,绝大多数是探讨金属在等直径的轧辊中塑性变形(对称轧制过程)的问题。但这样的过程仅仅是抽象的假设,它与实际的轧制情形有出入。实际上两个轧辊的直径往往存在着无法避免的差异,或由于轧机结构的本身便使得两轧辊具有不同的直径。近年来对型钢轧机、三辊式开坯机、冷轧带材轧机、三辊带钢轧机及其它轧机的研究表明:金属在辊口产生对于中性线不对称 In the domestic and foreign literature on the rolling theory, the vast majority of the metal is discussed in the equal-diameter roll plastic deformation (symmetrical rolling process) problems. But such a process is only abstract assumptions, it is different from the actual rolling situation. In practice there is often an unavoidable difference in the diameter of the two rolls or the two rolls have different diameters due to the structure of the mill itself. In recent years, research on section steel mills, three-roller open billet mills, cold strip mills, three-roll strip mills and other rolling mills has shown that the metal is asymmetric