重型轧制联轴器磨损演化及影响因素研究

Study on wear evolution and influencing factors of heavy-duty rolling coupling

轧制过程重型联轴器构件可自由伸缩及相对摆动,导致铜滑块极易磨损,磨损间隙引发的轧制冲击严重威胁整机结构安全。为此,文中以某钢厂3 800 mm初轧机联轴器为研究对象,建立联轴器轧制磨损动力学模型,采用表面轮廓动态更新方法对服役寿命内滑块磨损演化特性进行仿真及试验,在此基础上研究了联轴器转速、构件伸缩位移及相对摆角等因素对滑块磨损特性的影响规律。结果表明:轧制过程滑块磨损在时间和空间上都非常不均匀,由于滑块与销轴发生相对旋转滑移导致空间上滑块边缘磨损最为严重,由边缘向中部磨损逐渐减轻;时间上,由于滑块磨损产生间隙引起冲击,导致滑块磨损不断加快,磨损后期磨损最为剧烈;转速、构件摆角及轴向伸缩对磨损量空间分布特性无明显影响,但是对滑块的磨损速度影响很大;磨损中后期随着转速的提高,冲击增大,磨损速度显著加快;构件摆角与轴向伸缩量增大会导致滑块接触面滑移距离明显变长,从而大幅加速滑块磨损。

The heavy-duty coupling components in the rolling process can freely retract and oscillate.As a result,the copper slider is easily worn out,and the rolling impact caused by the wear gap seriously threatens the structural safety of the whole machine.Therefore,in this article,with the focus on a steel mill's 3800 mm rough rolling coupling,efforts are made to set up the dynamic model of rolling wear,and the dynamic update method of surface contour is used to simulate and explore the wear-evolution characteristics of the slide during the service life.On this basis,the influence of coupling speed,expansion displacement of components,relative swing angle and other factors on the wear characteristics of the slider is analyzed.The results show that:The slider wear in the rolling process is uneven in terms of time and space;the wear on the slider edge in space is the most serious due to the relative rotational slip of the slider and the pin shaft,and the wear from the edge to the middle gradually reduces.In terms of time,the gap caused by the slider wear leads to the impact and even the ever-growing wear of the slider,and the wear is the most severe in the later stage.The speed,swing angle of components and axial expansion have no obvious effect on the spatial distribution characteristics of wear amount,but have great influence on the speed of the slide wear.In the middle and late stages,with the ever-growing rotating speed,the impact becomes stronger,and the wear speed significantly intensifies.The increase of the swing angle and axial expansion of components will lead to a significantly longer slip distance of the slide's contact surface,which greatly accelerates the slide wear.