Researches on the Expert System for Rolling-straightening of Crankshaft Yang Guang Feng Yingchuen Assoc. Prof., School of Mechanical and Electrical, WUT, Wuhan 430070,China.To tackle the problem in the course of rolling straightening to crankshafts, the expert system to direct the operation of crankshaft rolling straightening is designed. The hull process of the measuring and rolling straightening to crankshafts can be automatic controlled in this system. And the system has better supervising ability. Furthermore, it can automatic give out the machining technology of rolling straightening to the crankshaft utilizing the experience data base, according to the importing parameters, which are the material mechanical property, fatigue strength requirement and permitting deformation amount of the crankshaft.crankshaft; rolling straightening; expert system