Analysis of work roll thermal behaviour during the hot rolling process: mathematical modelling and simulation experiments

Source abstract

The work roll thermal deformation has a direct impact on the final shape of hot-rolled strips, and the dynamic change of roll temperature distribution makes it difficult to predict the roll deformation accurately. To describe the temperature distribution change caused by the high temperature rolling pieces and complex external environment, a two-dimensional finite-difference model based on energy conservation is established, in which the effects of strip transverse temperature and individual strip temperatures on the contact heat transfer coefficient during the rolling cycle are considered. Additionally, the equivalent water-cooling coefficient is optimised based on actual production data. The result shown that the average temperature-predicted error was enhanced from ±4.0 to ±2.2°C. Further, the optimised model was used to analyse the temperature distribution of the work roll in both rolling process and the subsequent air-cooling process, the influence of various rolling parameters is obtained.