Aiming at the characteristics and conditions of the cold rolling rings,the rolling theory of multi-core roller was researched.The kinematics and mechanics of the expansive multi-core roller ring rolling were analyzed.And the deformation of the micro-element was analyzed.Then the deformation rule on the thickness direction of the multi-core roller ring rolling and the relationship between tangential strain and radial strain for feed amount were analyzed.The mathematical expression of the required process par...