【作者】 王凯；

【导师】 严志军；

【作者基本信息】 大连海事大学 ， 轮机工程， 2012， 硕士

【摘要】 润滑是降低摩擦和控制磨损最有效的措施,同时还有密封、降噪、冷却、清洁和防腐等作用。国内外的研究资料表明：保证摩擦副处于最佳的润滑状态是减少摩擦磨损、延长零部件使用寿命的重要途径。因此,对摩擦副的润滑状态进行研究,找出各因素对其的影响规律,才能从各方面采取措施保障摩擦副在工作过程中处于良好的润滑状态。本文采用接触电阻法对球-盘摩擦副点接触的润滑特性进行了研究。根据试验要求,设计制作了抗干扰能力强、测试范围广、可靠性高的润滑特性测试电路,使用LabVIEW图形化编程软件,编制了能够同时实现数字示波器波形数据的外存储和球-盘点接触试验台电机无级调速的程序,将原有试验台的传动系统改进为低速下运转稳定、干扰较小的同步带传动系统,研究了外载荷、滑动速度、润滑剂黏度和摩擦副表面粗糙度对摩擦副润滑特性的影响规律,得到以下结论：(1)接触电阻随润滑条件的变化(载荷、滑动速度、润滑油黏度和摩擦副表面粗糙度)呈现较好的规律性,可以有效地表征摩擦副的润滑特性。(2)建立了平均接触电阻与膜厚比λ的关联曲线,可以快速、直观地判定边界润滑状态与混合润滑状态之间的过渡转换,并能判断出混合润滑状态中起主导作用的润滑状态。更多还原

【Abstract】 Lubrication is the most effective measure to reduce friction and control wear, meanwhile, it has functions of sealing, noise reduction, refrigeration, cleaning and anticorrosion, etc. Domestic and foreign research data show that the important way of reducing frictional wear and extending the service life of the components is to ensure that friction pairs are in the best lubricating condition. Therefore, only if we study the lubricating oil film in friction pairs and find out the influence regularity which every factor impacts on it can we take measures from all sides to make sure friction pairs are in a good lubricating condition during working process.This thesis studies the lubricating property of Ball-on-Disk friction pair by using electrical contact resistance method. According to experiment requirements, I designed and manufactured a lubricating property testing circuit with strong anti-interference ability, extensive test range and high reliability. I applied the graphic programming software Lab VIEW and compiled a program which can realize the external storage of digital oscilloscope waveforms and motor stepless speed regulation of Ball-on-Disk point contact test-bed at the same time. And I improved the original transmission system of test-bed into synchronous belt transmission system which runs stable at low speed and interfere less. I also studied influence regularity of external load, sliding velocity, lubricant viscosity and roughness of friction pair towards lubricating condition, and obtained the following conclusion:(1) With the change of lubrication conditions (load, sliding speed, lubricating oil viscosity and friction pair surface roughness), the electrical contact resistance show better regularity, which can effectively characterize the lubricating properties of the friction pair.(2) I established relevance curve between average electrical contact resistance and oil film thickness ratioλ, through which we can judge the transition between boundary lubrication condition and mixed lubrication condition rapidly and intuitively, and discriminate which one plays a leading role in the mixed lubrication condition.更多还原