基于光干涉技术的薄膜润滑特性研究

发布时间：2018-03-03 11:33

本文选题：点接触　切入点：光干涉　出处：《大连海事大学》2012年硕士论文　论文类型：学位论文

【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。
[Abstract]:With the rapid development of modern mechanical technology, the thickness of oil film between many precision instruments and friction pairs working in specific working conditions has been reduced to nanometer order of magnitude, and the lubricating state is in thin film lubrication. How to ensure sufficient lubrication between such small gaps is of great practical significance in reducing wear, prolonging equipment life and improving working reliability, etc. At present, the theoretical characteristics and working mechanism of film lubrication still need to be improved. Based on the principle of relative light intensity of optical interferometry and the existing research results of film lubrication mechanism, a nanometer lubricant film thickness measuring instrument for optical interferometry is developed. The instrument has the advantages of high resolution, stable and reliable operation, and can be used for low speed lubrication. The film lubrication characteristics of point contact pure sliding lubricating friction pairs under light load conditions are studied experimentally. The relevant experimental specifications and experimental steps of the measuring instrument are studied, which is of guiding significance for the next step of the experiment. In this paper, the effects of load, speed, lubricant viscosity and contact surface roughness on the oil film thickness under the condition of low speed and light load are analyzed experimentally. The experimental results show that the application range of Hamrock-Dowson 's theoretical formula is limited, and the deviation between the measured film thickness and the theoretical formula curve is larger when the film thickness is small. With the increase of the velocity, the measured film thickness value tends to coincide with the theoretical formula curve. The thickness of oil film decreases with the increase of load, increases with the increase of velocity, viscosity of lubricant and roughness of contact surface, and the transition value of measured film thickness tends to coincide with the curve of theoretical formula is greatly affected by load, velocity and viscosity of lubricant. It is less affected by the roughness of contact surface.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH117.2

【参考文献】