【作者】 谷高磊；

【导师】 严志军； 朱新河；

【作者基本信息】 大连海事大学 ， 轮机工程， 2012， 硕士

【摘要】 随着现代机械工艺的迅速发展,许多精密仪器及工作于特定工况下的摩擦副间的油膜厚度已经减小至纳米量级,润滑状态处于薄膜润滑,如何在如此微小的间隙之间保证充分的润滑对于减少磨损、延长设备寿命和提高工作可靠性等方面具有重要的实践意义,目前对于薄膜润滑状态的理论特性及工作机理的研究工作仍需完善。本文以光干涉法相对光强原理为基础,结合薄膜润滑机理的现有研究成果,研制了光干涉法纳米级润滑膜厚测量仪,该测量仪分辨率高,工作稳定可靠,能够用来针对低速、轻载工况下点接触式纯滑动润滑摩擦副间的薄膜润滑特性开展实验研究。研究了该测量仪的相关实验规范和实验步骤,对下一步实验的开展具有指导意义。本文在低速、轻载工况下,针对载荷、速度、润滑剂粘度及接触表面粗糙度等因素对点接触薄膜润滑状态下油膜厚度的影响进行了实验分析,实验结果发现,Hamrock-Dowson理论公式的适用范围有一定限度,低速、膜厚较小时实测膜厚值与理论公式曲线的偏离较大,随着速度增加、膜厚增大实测膜厚值与理论公式曲线趋于吻合；油膜厚度随载荷的增大而减小,随速度、润滑剂粘度及接触表面粗糙度的增大而增大；实测膜厚值与理论公式曲线趋于吻合的过渡值受载荷、速度和润滑剂粘度的影响较大,受接触表面粗糙度的影响较小。更多还原

【Abstract】 The oil film thicknesses between some precise friction components have been decreased into nanometer level because of the fast development of morden mechanical manufacturing techniques, which makes the friction components working in thin-film lubricating condition. It has great practical significance to guarantee the friction pares’ sufficent lubrication which can help to decrease friction, increase the devices’life span and improve the working liability. For now, the characteristics and the working mechanism study of the thin-film lubrication still needs to be improved.This paper developed an optical interference nanometer-level oil film thickness mesuring device, basing on the relative light intensity principle and the research results of thin film lubrication mechanism. This device, with high resolution ratio, can be used for the thin-film lubrication study of point-contact and pure-sliding friction pares working in low speed and low load conditions. The testing specifications of this device have been studied, which can be considered as a guideline for future researches.The influences of the load, speed, oil viscocity and surface roughness to the oil film thickness in poin contacts thin-film lubrication have been studied using the oil film thickness mesuring device. The results show that the applicative scope of the Hamrock-Dowson formula has some limitations; when the rolling speed is lower and the film thickness is thinner, the experimental film thicknesses are deviated from the film thicknesses given by the Hamrock-Dowson formula; when the rolling speed is higher and the film thickness is thicker, the experimental results are going to be consistent with those given by the H&D formula; the oil film thickness becomes thinner as the load becoming higher; the increasing of rolling speed, oil viscosity and surface roughness makes the oil film thickness becoming thicker; the load and oil viscosity have the influence upon the transition point position where the experimental film thickness becomes to be consistent with the H&D formula, on which the surface roughness has little effect.更多还原