摘要
1 580热连轧四辊轧机在大压下率轧制过程中出现20 Hz异常振动及板带追逐现象。为了揭示摩擦力突变诱发自激振动的机理。采用有限元模拟分析54%压下率下轧制变形区内摩擦力方向突变特征,建立轧制变形区前滑块质量模块的周期运动力学模型,并求解二阶微分方程得到系统振动响应。研究结果表明:模型计算频率与监测到的20 Hz频率一致,当前滑区长度大于后滑区长度时,轧辊与板带间摩擦力环量方向发生突变并产生负阻尼效应,从而触发轧制自激振动。在此基础上,通过降低辊面摩擦因数、采用高刚度轧辊等手段,使前滑区长度小于后滑区长度并保持摩擦力方向一致,可有效抑制自激振动。该研究为热连轧机组的振动控制和稳定轧制提供理论依据和工程参考。
Abnormal vibration with an unknown frequency of 20 Hz accompanied by a strip chasing phenomenon was observed in a 1580 hot-rolling four-high mill under high reduction conditions.To clarify the mechanism whereby abrupt changes in friction force induce self-excited vibration,the mutation characteristics of the contact friction direction in the rolling deformation zone at a reduction rate of 54%were analyzed by finite-element simulation,and a periodic motion mechanical model of the front-slip mass module in the deformation zone was established.The vibration response of the system was obtained by solving the second-order differential equation.The results show that the calculated natural frequency coincides with the monitored 20 Hz frequency,and when the length of the forward-slip zone exceeds the backward-slip zone,the circulation direction of the friction force between the roll and strip reverses and produces a negative damping effect,which triggers self-excited vibration during high-reduction rolling.Through reducing the roller surface friction coefficient and using high-stiffness rollers,the length of the front slip zone can be made shorter than that of the rear slip zone while maintaining the direction of the friction force consistent,which can effectively suppress self-excited vibrations.This study provides a theoretical basis and engineering reference for vibration control and stable rolling in hot continuous rolling mills.
作者
李学通
张晓东
苟园园
郑永江
解家全
申光宪
LI Xuetong;ZHANG Xiaodong;GOU Yuanyuan;ZHENG Yongjiang;XIE Jiaquan;SHEN Guangxian(School of Mechanical Engineering,Yanshan University,Qinhuangdao 066000,China;Zoomlion Environmental Industry Co.Ltd.,Changsha 410205,China;Mathematics and Statistics College,Taiyuan Normal University,Taiyuan 030619,China)
出处
《中南大学学报(自然科学版)》
北大核心
2025年第12期4992-5000,共9页
Journal of Central South University:Science and Technology
基金
国家青年自然科学基金资助项目(E52005360)
石家庄市驻冀高校重点研发项目(241010191A)
唐山市科技成果转化项目(25160201A)。
关键词
轧机
轧制变形区
大压下率轧制工艺
追逐现象
自激振动
rolling mill
rolling deformation zone
high reduction rate rolling process
chasing phenomenon
self excited vibration
