Optimization design of deep cavity cylindrical roller based on FEM and RSM

In order to eliminate the stress concentration phenomenon of cylindrical roller ends for improving the fatigue life of roller bearing,the shape control parameters of deep cavity were analyzed,such as opening degree k,cavity length l and cavity cone angleα.The finite element contact model of roller was established.Based on response surface method(RSM),the optimization model of deep cavity was established,the minimum of stress difference between roller ends and middle part was chosen as optimal objective,k,l andαas design variables.The response surface model was solved,and a set of optimal solutions were obtained.Compared with other rollers,deep cavity roller can improve the stress concentration effectively.The contact stress distribution of cylindrical roller with optimized deep cavity is more homogenous,which could avoid the premature fatigue failure of roller bearing for local stress is too large.The combination method of FEM and RSM is simple and efficient,which can be used for other mechanical parts.