Analysis of Work Roll Thermal Behavior for 1450mm Hot Strip Mill with Genetic Algorithm

Work roll thermal contour is one of the important factors for roll contour design and configuration in hot strip rolling, for which the temperature field calculation is a critical factor. To realize the work roll thermal behavior for 1450mm hot strip mill, the temperature field and thermal contour calculation model was built with finite different methods, and the genetic algorithm was introduced to the model parameter optimization in order to improve the simulation precision. It was proved that the model can match the engineering precision requirement by the comparison between several calculated values and measured values of the work roll temperature. With the model, the work roll thermal contour variations in a rolling process, as well as the effect of rolling rhythm and shifting strategy on the work roll thermal contour were calculated. The results show that the work roll thermal crown varies relatively fast at the beginning of a rolling unit, and then tends to be stable. In the rolling process, the rolling rhythm shows great influence on the work roll thermal contour, while the shifting strategy shows little influence.