润滑油水污染对轧机油膜轴承瞬态热弹流润滑的影响

摘要

Taking the rolling mill oil film bearing as the research object,the oil-water two-phase flow of elastohydrody-namic lubrication model was established with transient and thermal effect of the Reynolds equation.The lubrication transi-ent behaviors of the rolling mill oil film bearing after water contamination of lubricating oil,and the effect of initial condi-tions on lubrication transient behaviors were analyzed.The results show that the pressure and thickness of the lubricating film is changed significantly under different instant.With the increasing of water content,the viscosity of the lubricating oil is increased,the center pressure and the center film thickness of the lubricating film are increased,the minimum film thick-ness is firstly increased then reduced,the maximum temperature is reduced.With the increasing of initial rotational speed, the maximum pressure is decreased, the inlet zone pressure, the secondary pressure peak and the film thickness are in-creased.With the increasing of initial rolling force,the maximum pressure is increased,the inlet zone pressure,the seconda-ry pressure peak and the film thickness are reduced.%以轧机油膜轴承为研究对象，利用考虑时变和热效应的 Reynolds方程建立油水两相流的弹流润滑模型，分析轧机油膜轴承在水介入润滑油后对其润滑的瞬态影响，并讨论不同初始条件下的瞬态润滑特性。结果表明：不同瞬时下，润滑膜的压力膜厚变化明显；润滑油介入水后，随着含水量的增加，润滑油黏度增加，润滑膜的中心压力及中心膜厚增加，最小膜厚先增大后减小，最大温度降低；随着初始转速的增加，最大压力减小，入口区压力、二次压力峰值及膜厚均增加；随着初始轧制力的增加，最大压力增加，入口区压力、二次压力峰值及膜厚均减小。