Abstract: Complex method is adopted, SP rolling mill’s kinematics rule of synchronism machanism and side machanism are completely simulated by engineering calculation software fortran language. At first the sizes of little and big eccentric center are optimized, the result of maximal constant velocity interval is obtained by calculation, at this base, the initial angular and eccentricity of side framing are optimization analysed. A group of optimal values of die maximal validity range are obtained. A conclusion of initial design is rational, through comparing reality used value of SP machanism die’s kinematics with optimization value. It gets a theory to understand SP rolling mill kinetic characteristic and improve further.

Key words: Complex method, Constant velocity interval, Eccentricity, Ininal angle, Validity range