调整轧机轴承座与机架间隙的智能衬板研究

Research on intelligent liner for adjusting the gap between bearingblock and frame of rolling mill

轧机装备的稳健运行是充分发挥设备潜在能力,提高板带材质量的重要保证。轧机结构的动态特性是保证轧机稳健运行的前提,按“微尺度静定”设计理论分析得知,轧辊轴承座与机架窗口立柱之间存在约1 mm微小间隙易使辊系处于静不定状态,进而产生辊间错位及交叉工况。通过有限元方法分析了间隙和偏移距对轧辊两端支反力的影响,并设计了一种用于安装在轧机牌坊和上工作辊轴承座之间的液压智能衬板。经分析发现,轧辊两端支反力不相等的原因根源在于支承辊与工作辊之间的交叉角,而交叉角来源于轧机轴承座与机架之间的“不得已”间隙。通过开发智能衬板可以实现零间隙控制,保证轧机轧辊平行定位稳定且可靠运转,从而释放了轧机的潜能,为轧机非线性动力学分析及稳定性控制提供了一种新思路,对现实生产具有重要指导意义。

The steady operation of rolling mill equipment is an important guarantee to give full play to the potential capacity of the equipment and improve the quality of sheet and strip.The dynamic characteristics of the rolling mill structure are the premise to ensure the steady operation of the rolling mill.According to the analysis of the“micro-scale statically determinate”design theory,the existence of about 1 mm small gap between the roll bearing seat and the frame window column is easy to make the roll system in the static indeterminate state,and then produce the dislocation and cross between the rolls.By finite element method,the influence of clearance and offset on the support reaction at both ends of the roll is analyzed,and a hydraulic intelligent liner is designed to be installed between the mill yard and the bearing seat of the upper work roll.It is found that the root cause of the unequal support reaction at both ends of the roll is the cross angle between the back-up roll and the work roll,and the cross angle comes from the“forced”gap between the rolling mill bearing seat and the frame.By developing intelligent liner,zero gap control can be realized to ensure the stable and reliable operation of rolling rolls parallel positioning,which releases the potential of rolling mill,provides a new idea for nonlinear dynamic analysis and stability control of rolling mill,and has important guiding significance for practical production.