单辊驱动冷轧平整机的水平振动研究
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摘要
针对单辊驱动四辊冷轧平整机轧制过程中辊系的水平振动问题,本文考虑装配间隙、轧辊偏移距和非线性阻尼等影响因素,建立了平整机辊系水平振动非线性动力学模型,并考察了平整机水平振动机制以及轧制工艺参数对辊系水平振动的影响规律。通过现场实测某单辊驱动冷轧平整机的振动信号可以发现,其辊系水平振动呈发散状态,工作辊尤其下工作辊水平振动剧烈,测试结果与同条件下轴承座开式约束时的辊系水平振动仿真结果相吻合,模型的有效性和准确性得到验证;另一方面,轴承座闭式约束可有效减轻轧辊水平振动,此时,轧制工艺参数波动也会对辊系水平振动产生影响,且轧制速度的影响效果最为显著。
Aimed at the horizontal vibration problem of a four-roll cold temper mill driven by a singleroll during the cold rolling process,the nonlinner dynamic model of the horizontal vibration of the roll system was established by considering the influencing factors including the assembly clearance,roll offset and nonlinear damping.The horizontal vibration mechanism as well as the influence of rolling process parameters on the horizontal vibration of the roll system were investigated accordingly.Through the on-site measurement of the vibration signals of a single-roll driven cold rolling temper mill,it's found that the horizontal vibration of this roll system is in a divergent state,and the horizontal vibration of the working rolls,especially the lower working roll,are severe.The measured results are consistent with the simulation results of the roll system in the presence of the open constraint of bearing chock,and the validity and accuracy of the established model are therefore verified.On the other hand,the closed constraint of bearing chock can effectively reduce the horizontal vibration of the roll system.At the same time,the fluctuation of the rolling process parameters can also have effects on the horizontal vibration of the roll system,and the influence of rolling speed turns to be the most significant.
Aimed at the horizontal vibration problem of a four-roll cold temper mill driven by a singleroll during the cold rolling process,the nonlinner dynamic model of the horizontal vibration of the roll system was established by considering the influencing factors including the assembly clearance,roll offset and nonlinear damping.The horizontal vibration mechanism as well as the influence of rolling process parameters on the horizontal vibration of the roll system were investigated accordingly.Through the on-site measurement of the vibration signals of a single-roll driven cold rolling temper mill,it's found that the horizontal vibration of this roll system is in a divergent state,and the horizontal vibration of the working rolls,especially the lower working roll,are severe.The measured results are consistent with the simulation results of the roll system in the presence of the open constraint of bearing chock,and the validity and accuracy of the established model are therefore verified.On the other hand,the closed constraint of bearing chock can effectively reduce the horizontal vibration of the roll system.At the same time,the fluctuation of the rolling process parameters can also have effects on the horizontal vibration of the roll system,and the influence of rolling speed turns to be the most significant.
引文
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[2] 周家林,何浩,饶刚,等.单辊驱动冷轧平整机振纹实测及振动机理分析[J].钢铁研究学报,2017,29(11):900-905.
[3] 周家林,何浩,饶刚,等.冷轧平整机带钢表面振纹研究[J].武汉科技大学学报,2017,40(2):95-100.
[4] 彭仕军,梁民勤,郭志杰.1550mm平整机支撑辊振动纹分析与改进[J].柳钢科技,2015(6):6-7,29.
[5] Sun J L,Peng Y,Liu H M,et al.Forced transverse vibration of rolls for four-high rolling mill[J].Journal of Central South University of Technology,2009,16(6):954-960.
[6] Brusa E,Lemma L,Benasciutti D.Vibration analysis of a Sendzimir cold rolling mill and bearing fault detection[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2010,224(3):1645-1654.
[7] Wu S L,Shao Y M,Wang L M,et al.Relationship between chatter marks and rolling force fluctuation for twenty-high roll mill[J].Engineering Failure Analysis,2015,55:87-99.
[8] 杨琪辉.二十辊轧机的工作辊振痕动力学建模与仿真分析[D].重庆:重庆大学,2015.
[9] Shao Y M,Deng X,Yuan Y L,et al.Characteristic recognition of chatter mark vibration in a rolling mill based on the non-dimensional parameters of the vibration signal[J].Journal of Mechanical Science and Technology,2014,28(6):2075-2080.
[10]Chen Y,Liu S Y,Shi T L,et al.Stability analysis of the rolling process and regenerative chatter on2030tandem mills[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2002,216(12):1225-1235.
[11]侯福祥,张杰,史小路,等.单辊驱动平整机水平颤振[J].北京科技大学学报,2006,28(10):973-977.
[12]王瑞鹏,彭艳,张阳,等.轧机耦合振动机理研究[J].机械工程学报,2013,49(12):66-71.
[13]孙建亮,刘宏民,李琰赟,等.热连轧机水平振动及其与轧制参数影响关系[J].钢铁,2015,50(1):43-49.
[14]束学道,申光宪,陈延强.铝箔轧机工作辊轴承座稳定性分析[J].轧钢,2002,19(3):6-8.
[15]丁长安,张雷,周福章,等.线接触弹性接触变形的解析算法[J].摩擦学学报,2001,21(2):55-58.
[16]顾海明,周勇军.机械振动理论与应用[M].南京:东南大学出版社,2007.
[17]彭仕军,梁民勤,郭志杰.平整机支撑辊振动纹分析及控制[J].柳钢科技,2012(3):32-35.