Improvement of prediction model for work roll thermal contour inhot strip mill

来源期刊：中南大学学报(英文版)2010年第6期

论文作者：王连生 杨荃 何安瑞 郑宣 于洪瑞

文章页码：1251 - 1257

Key words：hot rolling; finite element; finite difference; work roll; thermal contour

Abstract: Though high accuracy of the thermal contour was obtained while adopting finite element method, it could not meet the real-time requirement. One-dimensional finite difference method could realize real-time control in the case of neglecting both the circumferential and radical heat exchange, but the over-simplified modes resulted in poor accuracy. And two-dimensional full explicit difference was also limited in practical application since its time step was restricted to keep the model stable. Consequently, a new method of alternating direction finite difference was introduced and discussed in the model’s stability, calculating speed and precision. Specific work roll after one real rolling unit was researched, The result shows that error of temperature on work roll surface between measured and calculated values is within 5 ℃. The influence of rolling rhythm and strip width on thermal crown was also studied. The conclusion is verified theoretically and practically that it can maintain absolutely stable and meet the online requirement.