Roll profile electromagnetic control characteristics under roll heterogeneity

The electromagnetic control roll (ECR) and electromagnetic stick (ES) are the core elements and the main driving parts of roll profile electromagnetic control technology (RPECT). To prolong the service life, it is necessary to treat ECR and ES surfaces. According to the heterogeneous characteristics of surface treatments, the roll profile electromagnetic control characteristics were analyzed for different parameters. An electromagnetic-thermal-force coupled axisymmetric finite element model was built to explore the differences in performance as a result of several treatment strategies, and the model was verified by experimental results measured with a roll profile electromagnetic control experimental platform. This model was used to analyze the influence of the heterogeneity of ECR inner hole and ES on the roll crown, the roll profile, the average contact pressure, and the stress state during RPECT process. The results indicate that the heterogeneous layer at ECR inner hole has a restrictive effect on RPECT and that the heterogeneous layer of ES can enhance the profile control ability of RPECT. A reasonable configuration scheme between the heterogeneity of ECR inner hole and the ES can increase the life of ECR and maintain the control ability of RPECT.