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Influence of mill modulus control gain on vibration in hot rolling mills

Journal of Iron and Steel Research(International) 2020年第5期27卷 528-536页

作者： Jie-bin Qi Xin-xin Wang Xiao-qiang Yan School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Research Institute of Technology Shougang Group Co.Ltd.Beijing 100043China

The rolling mill vibration is characterized by the coupling effects among mechanical,electrical,hydraulic and interfacial subsystems.The influence of the mill modulus control gain in automatic gauge control on the vibration in hot rolling mills was investigated.Firstly,an experiment related to the mill modulus control gain was carried out in the hot rolling mill process,and it was found that the rolling mill vibration increases with the mill modulus control gain.Then,based on the Sims rolling force method,the coupling dynamic model was established to explain this phenomenon.Finally,the influence of mill modulus control gain on the vibration was analyzed numerically on the basis of the coupling dynamic model.Moreover,the agreement between the experimental results and the simulation results was confirmed and the measure reducing the mill modulus control gain was obtained to relieve mill vibration.

关键词： rolling mill vibration Coupling dynamic model Automatic gauge control mill modulus control gain vibration suppression

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vibrations of tandem cold rolling mill: coupled excitation of rolling force and variable stiffness of fault-free back-up roll bearing

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Journal of Iron and Steel Research(International) 2023年第9期30卷 1792-1802页

作者： Yu-jie Liu Shen Wang Jie-bin Qi Xiao-qiang Yan School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering and Mechanics Lehigh UniversityBethlehemCommonwealth of Pennsylvania 18015USA

vibration issues of a five-stand tandem cold rolling mill were found in the steel production practice,and the experimental observation and numerical analysis indicated that the vibrations were related to the back-up roll bearing.The results were validated by replacing the back-up roll bearing with the new bearing resulting in 30%decline in vibration amplitude.Models describing the four-row cylindrical roller bearing and the vertical system of the cold rolling mill including the bearing were established.Moreover,the mechanisms of periodic excitation and amplified vibrations of fault-free bearing were explained theoretically,along with the analysis of bifurcation behaviors of the motion states of the roller bearing and rolling mill system.It is found that the energy transmitted between vibrations with different frequencies if multiple excitation frequencies in the rolling mill system were close.

关键词： rolling mill vibration Cold tandem mill Fault-free bearing vibration amplification Variable stiffness Characteristics

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Characteristic of Torsional vibration of mill Main Drive Excited by Electromechanical Coupling

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Chinese Journal of Mechanical Engineering 2016年第1期29卷 180-187页

作者： ZHANG Yifang YAN Xiaoqiang LIN Qihui Institute of Mechanical Engineering University of Science and Technology Beijing School of Mechanical Engineering Anhui University of Technology

In the study of electromechanical coupling vibration of mill main drive system, the influence of electrical system on the mechanical transmission is considered generally, however the research for the mechanism of electromechanical interaction is lacked. In order to research the electromechanical coupling resonance of main drive system on the F3 mill in a plant, the cycloconverter and synchronous motor are modeled and simulated by the MTLAB/SIMUL1NK firstly, simulation result show that the current harmonic of the cycloconverter can lead to the pulsating torque of motor output. Then the natural characteristics of the mechanical drive system are calculated by ANSYS, the result show that the modal frequency contains the component which is close to the coupling vibration frequency of 42Hz. According to the simulation result of the mechanical and electrical system, the closed loop feedback model including the two systems are built, and the mechanism analysis of electromechanical coupling presents that there is the interaction between the current harmonic of electrical system and the speed of the mechanical drive system. At last, by building and computing the equivalent nonlinear dynamics model of the mechanical drive system, the dynamic characteristics of system changing with the stiffness, damping coefficient and the electromagnetic torque are obtained. Such electromechanical interaction process is suggested to consider in research of mill vibration, which can induce strong coupling vibration behavior in the rolling mill drive system.

关键词： rolling mill vibration current harmonic speed oscillation electromechanical coupling vibration characteristic

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