Numerical simulation and model of control-efficiency of thermal crown of work rolls in cold rolling

LI Xue-tong(李学通)^{1, 2}, WANG Min-ting(王敏婷)³, DU Feng-shan(杜凤山)^{1, 2}, ZHANG Guo-liang(张国良)⁴

(1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,
Yanshan University, Qinghuangdao 066004, China;
2. National Key Laboratory of Metastable Materials Science & Technology,
Yanshan University, Qinghuangdao 066004, China;
3. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;
4. China First Heavy Industries, Dalian Design & Research Institute Co., Ltd., Dalian 116600, China)

Abstract:Aiming at accuracy control of the thermal crown of work rolls in cold rolling, new parameters such as regulation domain and control-efficiency factors were proposed and a numerical analysis model of the thermal crown of work rolls was established using finite difference method to study roll’s thermal deformation. Based on simulation results, the influences of control-efficiency factors on thermal crown are presented and the thermal crown of work rolls is analyzed after taking sub-cooling of sprinkling beam into consideration. It has been found that the control-efficiency factor of any position on the roll’s surface is linear function of the temperature and the control ability of water temperature is stronger than other control parameters. In addition, the verification of the model has been carried out based on the producing technology data in some factories and the numerical simulation results coincide well with the experimental data. Therefore, this work has important value for on-line control of roll’s crown in cold rolling.

Key words:cold rolling; finite difference method; thermal crown; control-efficiency factor