摘要
针对国内某冷连轧机组中间辊推力轴承频繁损坏的问题,通过分析机组设备磨损和安装精度等影响因素,确定由于衬板磨损使中间辊轴线偏移进一步造成轴向力过大,导致轴承工作过程中偏载和发热严重,并且最终损坏。为此,基于中间辊轴线偏移即轧辊交叉导致中间辊与其他轧辊产生相对位移的几何分析,结合两粗糙弹性零件接触的预位移原理,并应用金属塑性变形模型和轧辊弹性变形模型,分别建立轧辊接触区内黏滞区和滑动区的单位轴向力计算方法,最终实现中间辊总轴向力的预报。在此基础上,考虑中间辊与工作辊及中间辊与支撑辊的辊间力分布对轴向力的影响,确定了以降低边部辊间力为基础优化轧制规程的治理思路。提出了辊间力分布的评价指标,并进一步确定了中间辊轴向力治理的目标函数,以出口板形、轴向力、辊间力分布评价指标为约束条件,建立了中间辊轴向力的治理技术。将轴向力预报模型应用到冷连轧机组并对比实测值和预报值,以典型钢种S350GD+AZ为例,结果表明预报模型在各机架的计算偏差均小于8%。将轴向力治理技术应用到冷连轧机组,并对比治理前后的各工艺参数,表明在保证出口板形的前提下大幅度降低了各机架中间辊轴向力,有效避免了中间辊轴向力过大导致的轴承损坏问题,保证了机组的稳定生产。
Addressing the issue of frequent damage to the thrust bearings of the intermediate rolls in a domestic cold continuous rolling unit,an analysis of factors such as equipment wear and installation precision was conducted.It was determined that wear of the liner caused a shift in the axis of the intermediate roll,leading to excessive axial force,resulting in severe off-load and overheating during the bearing operation,ultimately causing damage.Therefore,based on the geometric analysis of the relative displacement of the intermediate roll and other rolls caused by the cross of the rolling rolls,which is a result of the intermediate roll axis shift,and combining the principle of pre-displacement for the contact of two rough elastic parts,the metal plastic deformation model and the roll elastic deformation model were applied.Methods for calculating the unit axial force in the viscous and sliding zones within the roll contact area were established,ultimately achieving a forecast of the total axial force of the intermediate roll.On this basis,considering the influence of the force distribution between the intermediate roll and the work roll,as well as the intermediate roll and the backup roll on the axial force,a management approach was determined to optimize the rolling schedule based on reducing the inter-roll force at the edges.An evaluation index for the distribution of inter-roll force was proposed,and the objective function for the management of the intermediate roll axial force was further determined.With the exit plate shape,axial force,and inter-roll force distribution evaluation index as constraints,the management technology for the intermediate roll axial force was established.The axial force forecast model was applied to the cold continuous rolling mill unit and compared with the actual and forecast values.Taking the typical steel grade S350GD+AZ as an example,the results showed that the calculation deviation of the forecast model in each stand was less than 8%.The application of the axial force management technology to the cold continuous rolling mill unit and the comparison of the process parameters before and after management showed that,while ensuring the exit plate shape,the axial force of the intermediate roll in each stand was significantly reduced,effectively avoiding the problem of bearing damage caused by excessive axial force of the intermediate roll,ensuring the stable production of the unit.
作者
陈光
刘云峰
张冀
CHEN Guang;LIU Yunfun;ZHANG Ji(Cold Rolled Strip Steel Plant,Shanghai Meishan Iron&Steel Co.,Ltd.,Nanjing 210039,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China)
出处
《重型机械》
2024年第4期60-66,共7页
Heavy Machinery
关键词
轴向力
中间辊
轧辊交叉
冷连轧机组
axial force
intermediate roll
roll crossing
cold continuous rolling unit
