Thermal Compensation of Work Roll Grinding in Hot Strip Mills

In this paper, the influence of the residual work roll thermal crown after hot rolling on the work roll grinding process is investigated. A two-dimensional axisymmetric thermal model is employed to simulate the thermal behavior of the work roll during the rolling campaign and the post-rolling cooling process. The governing equation is solved based on an implicit finite volume method. The model parameters are identified based on the evolution of the work roll thermal crown measured in the mill during the cooling period. In order to increase the roll shop productivity, two work roll hot-grinding methods, “without contour compensation” and “with contour compensation”, are proposed to eliminate the post-rolling cooling process. According to the on-site demand, experimental trials of the work roll hot-grinding with contour compensation are carried out in the roll shop. Based on the work roll temperature measured prior to the grinding process, the work roll can be ground immediately saving significant labor costs and time. The results indicate that the final profile of the work roll based on the proposed grinding procedure is in agreement with the target profile.