Improvement of prediction model for work roll thermal contour in hot strip mill |
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Authors: | Lian-sheng Wang Quan Yang An-rui He Xuan Zheng and Hong-rui Yu |
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Affiliation: | National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China |
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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 °C. 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. |
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