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Rolling mill slip prediction model based on limit static friction torque |
SHI Jian-rui1,2, SUN Wen-quan1,2, CHEN Lu-zhen1,2, YUAN Tie-heng1,2, ZHANG Xi-bang1,3, LI Li-gang1,3 |
1. National Engineering Technology Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, Beijing 100083, China; 2. National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China; 3. Design and Research Institute Co., Ltd., University of Science and Technology Beijing, Beijing 100083, China |
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Abstract In the process of cold continuous rolling, when the rolling torque is greater than the limit static friction torque between the roll and the rolled piece, the relative sliding will occur between the roll and the rolled piece, which will lead to the occurrence of sliding. For reducing the surface defect caused by slip, based on the basic formula of the plastic deformation in strip rolling, the unit rolling force distribution in the forward and backward sliding regions is simplified linearly, and then the ultimate static friction torque model is derived. The accuracy of the model is verified by the measured data. From the changing trend of the difference between rolling torque and ultimate static friction torque, it is found that the difference value gradually decreases to zero with the increase of rolling kilometers. At the same time, the method that the difference value is less than the set threshold is used to determine whether the work roll is slipping or not. It has been proved that the model is of great practical significance for the judgment of the work roll slippage in the tandem cold rolling.
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Received: 07 December 2020
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