Research on Service Accuracy of Roll System Assembly Structure of Rolling Mill

doi:10.3901/JME.260174

Abstract

Abstract: The assembly structure accuracy of rolling mill systems constrains the improvement of equipment service stability, among which the service accuracy of the roll system assembly structure is key to affecting the assembly stiffness of the rolling mill. To address the impact vibration issues in a four-hot-strip mill, a roll-to-roll contact stiffness model considering roll crossing is established based on the energy method. A contact stiffness model for chock liners is developed based on contact mechanics and statistical theory. Furthermore, by considering the relationship between the quasi-static roll axis position and stiffness, a roll system dynamic model is constructed to investigate the influence of roll system assembly structure stiffness on dynamic characteristics. A monitoring system for the service accuracy of the rolling mill roll system is proposed, which combines roll system calibration and rolling process data to obtain the side clearances and stiffness states of the roll system at different service stages. A rolling mill stiffness dataset with roll crossing state and load as variables is constructed. By matching the measured stiffness and stiffness gradient during forward and reverse calibration processes, the roll crossing state variables are obtained. The relative difference between the theoretical initial deviation and the matched values is within 20%, establishing the correlation between offline and calibration-process roll system assembly states. Finally, rolling tests are conducted to acquire the roll system clearance states before and after adjustments. The roll-to-roll crossing angle is reduced from 120 μrad to 20 μrad, and the chock liner fit angle due to tolerance is reduced from 13 μrad to 5 μrad, resulting in a suppression of work roll horizontal vibration by over 60%. The established dynamic model effectively simulates the roll system impact vibration. The research demonstrates that the assembly structure stiffness model, which accounts for chock liner fit and roll crossing, can predict the service accuracy of the roll system assembly structure. By clarifying the relationship between offline roll system data and the service accuracy during calibration and rolling processes, an effective offline adjustment strategy for vibration suppression can be achieved.

Key words: roll system, assembly accuracy, structural stiffness, dynamic characteristics, calibration procedure

CLC Number:

TG333

ZHAO Xiangyang, JIAO Yanlong, HOU Xinxiang, WANG Jin, XING Jiankang, XIE Tianwei, ZHOU Na, LI Yupeng, JI Fengchuan, PENG Yan. Research on Service Accuracy of Roll System Assembly Structure of Rolling Mill[J]. Journal of Mechanical Engineering, 2025, 62(6): 29-46.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260174

http://www.cjmenet.com.cn/EN/Y2025/V62/I6/29

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