冷轧工作辊表面微观形貌磨损行为研究
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摘要
针对冷轧工作辊服役过程中表面μm量级磨损,在实际带钢轧制线上对应跟踪实测了工作辊上机前和下机后的表面微观形貌与特征,分析了整个服役周期内带钢粗糙度值随时间的变化规律.通过销盘实验模拟电火花毛化轧辊表面磨损行为,研究了磨损过程中表面三维形貌的演变和磨损量的变化,验证了关于轧辊表面磨损机制的假设,建立三种磨损机制的描述模型.基于元胞自动机方法,建立了冷轧工作辊表面微观形貌磨损演变行为的仿真模型,仿真结果再现了工业生产中工作辊表面磨损前期尖峰折断及中后期的微观切削过程,粗糙度变化规律与实测结果取得定性一致.
To study the surface wear process of working roll during cold rolling process,the surface micro characteristics of the working roll before and after the actual production were measured and compared,and the variation law of steel strip roughness in the whole service period was observed.Three description models of wear mechanisms were proposed,that is,the micro-cutting existing in the whole service period,the spike break existing in the early stage of period and the fatigue failure accumulating in the later stage of service.The hypothesis of the wear mechanism of roller surface was verified by pin plate experiment.Based on the cellular automata method,a model simulate the surface wear principles of working roll surface morphology was established.Results show that the simulation results reproduce the process of spike breaking in the early stage of period and micro-cutting in the middle and late stage,and the roughness variation law shows great accordance with the measured results.
To study the surface wear process of working roll during cold rolling process,the surface micro characteristics of the working roll before and after the actual production were measured and compared,and the variation law of steel strip roughness in the whole service period was observed.Three description models of wear mechanisms were proposed,that is,the micro-cutting existing in the whole service period,the spike break existing in the early stage of period and the fatigue failure accumulating in the later stage of service.The hypothesis of the wear mechanism of roller surface was verified by pin plate experiment.Based on the cellular automata method,a model simulate the surface wear principles of working roll surface morphology was established.Results show that the simulation results reproduce the process of spike breaking in the early stage of period and micro-cutting in the middle and late stage,and the roughness variation law shows great accordance with the measured results.
引文
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[2]张清东,张雍,李瑞,等.带钢冷轧机工作辊表面粗糙峰轧制磨损过程离散元法研究[J].机械工程学报,2016,52(6):72-78,85.
[3]徐流杰,魏世忠,王强,等.基于BP神经网络的V9-Cr4-Mo3高速钢冷轧辊磨损模型[J].摩擦学学报,2006,26(6):541-545.
[4]Wang Zhanjiang,Zhou Qinghua.Applying a population growth model to simulate wear of rough surfaces during running-in[J].Wear,2012(294):356-363.
[5]Fang Liang,Liu Weimin,Du Daoshan,et al.Predicting three-body abrasive wear using Monte Carlo methods[J].Wear,2004,256(7-8):685-694.
[6]Hannes D,Alfredsson B.A fracture mechanical life prediction method for rolling contact fatigue based on the asperity point load mechanism[J].Engineering Fracture Mechanics,2012,83:62-74.
[7]徐冬.冷轧界面表面形貌演变及形成过程研究[D].北京:北京科技大学机械工程学院,2014.
[8]姜增辉,土琳琳,石莉,等.硬质合金刀具切削Ti6A14V的磨损机理及特征[J].机械工程学报,2014,50(1):178-184.
[9]陈飞,崔振山,董定乾.微观组织演变元胞自动机模拟研究进展[J].机械工程学报,2015,51(4):30-39.
[10]方斌.烧结过程中陶瓷刀具材料微观组织结构演变模拟研究[D].山东:山东大学机械工程学院,2007.
[11]徐野,吕亚非,黄晋阳.摩擦层形成的元胞自动机模拟[J].北京化工大学学报:自然科学版,2010(6):136-140.
[12]张雍,张清东,李瑞,等.带钢冷轧机工作辊表面轧制磨损形貌的模拟仿真[J].中国表面工程,2015,28(3):114-121.
[13]张清东,张勃洋,马磊,等.高强度带钢表面粗糙度轧制转印规律及预测模型[J].工程科学学报,2016,38(1):118-127.