油水两相流润滑轧机油膜轴承的摩擦行为分析

发布时间：2018-03-04 20:22

本文选题：油水两相流　切入点：油包水　出处：《表面技术》2016年10期 　论文类型：期刊论文

【摘要】：目的研究含水润滑油对轧机油膜轴承的摩擦学性能的影响。方法选取轧机油膜轴承为研究对象,利用油水两相流体数学模型和弹流润滑方程研究轧机油膜轴承在等温条件下的润滑特性,分析油水两相流体润滑膜的压力、膜厚分别随含水率、滑滚比、轴颈间隙、主轴转速和轧制力的变化关系。结果水介入润滑油之后,随着含水率的增加,油水两相流体的黏度先增加,在含水率为30%左右时达到最大值(0.08 Pa·s),之后又迅速减小,直至接近于纯水的黏度(0.001 Pa·s)。当含水率为30%时,无量纲膜厚达到最大值(0.82),当含水率为90%时,无量纲膜厚达到最小值(0.68)。结论随着含水率的增加,油水两相流体由油包水流型转化为水包油流型,压力变化不大,膜厚先增加后减小,作为润滑剂,油包水流型比水包油流型具有更好的润滑性能,且在流型转变点处的润滑性能最优。随着滑滚比和轧机油膜轴承主轴转速的增加,压力减小,承载能力减弱,膜厚增加,润滑性能增强。随着轴颈间隙和外部轧制力的增加,压力增加,承载能力增强,膜厚减小,润滑性能减弱。
[Abstract]:Objective to study the effect of water containing lubricating oil on the tribological properties of rolling mill oil film bearings. The lubrication characteristics of rolling mill oil film bearing under isothermal condition were studied by using oil-water two-phase fluid mathematical model and elastohydrodynamic lubrication equation. The pressure and thickness of oil-water two-phase fluid lubricating film were analyzed with water content, slip ratio, journal clearance, respectively. Results the viscosity of oil-water two-phase fluid first increased with the increase of water content, and reached the maximum value of 0.08 Pa 路s-1 when the water content was about 30%, and then decreased rapidly. When the water content is 30, the thickness of the dimensionless film reaches the maximum value of 0.82%, and when the water content is 90, the thickness of the dimensionless film reaches the minimum value of 0.68. Conclusion with the increase of water content, The oil-water two-phase fluid changed from the oil-in-oil flow type to the water-in-water flow type, and the pressure changed little, the film thickness increased first and then decreased. As a lubricant, the oil-in-water flow type had better lubricating performance than the water-in-oil flow type. With the increase of sliding roll ratio and rolling mill oil film bearing spindle speed, the pressure decreases, the bearing capacity weakens, the film thickness increases, the lubrication performance increases, and with the increase of journal clearance and external rolling force, the lubrication performance is optimized at the transition point of the flow pattern. The pressure increases, the bearing capacity increases, the film thickness decreases, and the lubrication performance weakens.
【作者单位】：青岛理工大学机械工程学院;
【基金】：国家自然科学基金项目(51575289、51175275)~~
【分类号】：TG333

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