Lubrication Characteristics And Finite Element Analysis Of Rolling Mill Oil Film Bearings

In the long-term high-speed heavy load and shock vibration of rolling mill oil film bearing,bearing often fails due to surface friction and abrasion,in order to improve the service life of oil film bearing of rolling mill,the lubricating mechanism and structural strength of oil film bearing of rolling mill are studied.In this paper,the elastic hydrodynamic lubrication problem of the oil film bearing and the finite element analysis of the oil film bearing structure of the rolling mill are studied,the isothermal elastohydrodynamic lubrication Problem of the oil film bearing of the rolling mill,the thermal elastohydrodynamic lubrication of the microstructure are studied,and the modal analysis and the contact analysis of the oil film bearing structure of the rolling mill are studied.Firstly,the isothermal elastohydrodynamic lubrication model of oil-water mixture state of rolling Mill is established,and the lubrication characteristics of oil-film bearing under isothermal condition are studied by considering the fluid characteristic equation of water-oil mixture.The influence of water content on the lubricating characteristics of oil film bearing of rolling mill was studied,and the influence of water content on the pressure and film thickness of oil film bearing was analyzed,and the effect of three kinds of bushing material,Babbitt,Al Alloy and 45# Steel on the lubricating performance of oil film bearing was analyzed.Considering the influence of inertia force on the lubricating characteristics of oil film,The influence of fluctuating load and impact load on the lubricating characteristics of oil film bearing of rolling Mill is studied,and the influence of sinusoidal wave load and random vibration load on oil film pressure and oil film thickness is analyzed.Secondly,considering the microscopic morphology of the surface of the oil film bearing of rolling mill,the thermal elastohydrodynamic lubrication model of the oil film micro-topography is established.This paper studies the lubricating characteristics of the oil film bearing of rolling mill under the cosine rough surface,analyzes the influence of the microscopic morphology amplitude and wavelength on the pressure and film thickness,and studies the effect of microscopic morphology on the lubricant temperature of the oil film bearing of the rolling mill.Then,considering the complexity of the working environment of the oil film bearing of rolling mill,the impact load will inevitably be generated,so the three-dimensional model of the oil film bearing of rolling Mill is established by using the three-dimensional modeling software SolidWorks,and the Ansys Workbench is introduced into the modal analysis andharmonious response analysis.In order to explore the dynamic characteristics of the oil film bearing of rolling mill,the relationship between the natural frequency and the amplitude of the vibration pattern and the stress and displacement are analyzed,which provides a reference for the oil film bearing of the mill to avoid resonance phenomenon.Finally,considering that the rolling mill oil film bearing and roll are in dry friction or mixed lubrication state at startup,the assembly model of the oil film bearing of roll and Mill is established,and the finite element contact analysis is carried out,and the bearing structural parameters such as cavity length,cavity depth,cavity width,inlet hole diameter and so on are considered.The effect of equivalent stress and displacement value on mechanical properties provides data support for the optimization of contact state of oil film bearing in rolling mill.