海水润滑塑料轴承的摩擦学性能研究

发布时间：2018-04-09 23:20

本文选题：海水润滑轴承　切入点：聚四氟乙烯　出处：《青岛理工大学》2012年硕士论文

【摘要】：海水具有强烈的腐蚀性，所以用海水作润滑剂时要选取合适的材料作为摩擦副材料。本文选取具有优异耐腐蚀能力的聚四氟乙烯材料作为海水润滑条件下的轴瓦材料，建立了海水润滑轴承无限长线接触的弹流润滑模型，利用多重网格法和多重网格积分法，得到了不同因素影响下轴承润滑的数值解；利用高速环块摩擦磨损试验机对聚四氟乙烯材料在海水全浴条件下的摩擦磨损性能进行了研究。首先，基于弹流润滑理论建立了海水润滑轴承的弹流润滑模型，，应用多重网格技术得到了等温条件下海水润滑膜压力和膜厚的分布；讨论了不同工况下海水润滑膜压力、膜厚的分布，比较了不同材料在海水润滑条件下的润滑性能。其次，考虑热效应及表面粗糙度的作用，得到了海水润滑轴承微观热弹流的完全数值解；对比分析了热解与等温解的不同，分析了润滑膜压力及膜厚随表面粗糙度各参数的变化情况。再次，综合考虑了热效应、粗糙度及时变效应的影响，得到了海水润滑轴承时变微观热弹流润滑的完全数值解；分析了一个时间周期内润滑膜压力和膜厚的变化及时变效应对轴承润滑的影响，讨论了不同粗糙度参数、转速、载荷等参数下轴承的润滑性能。然后，建立了连续冲击载荷模型，数值模拟了冲击载荷作用下海水润滑膜压力及膜厚的分布；对比分析了正弦周期脉冲及三角形周期脉冲分别作用时润滑膜中心压力、中心膜厚及最小膜厚随时间变化的特性；讨论了载荷幅值及脉宽对润滑膜特性的影响。最后，利用数显式高速环块摩擦磨损试验机，分析了聚四氟乙烯材料试块与镀镍钢环在海水全浴润滑条件下对磨时，摩擦因数随转速、载荷、运行时间及海水含沙量的变化情况；借助表面形貌仪、扫描电子显微镜对磨痕进行了表面形貌观察，分析了聚四氟乙烯材料在海水润滑条件下的磨损机理。
[Abstract]:Seawater is very corrosive, so the suitable material should be chosen as friction material when using seawater as lubricant.In this paper, PTFE material with excellent corrosion resistance is selected as bearing material under seawater lubrication, and the elastohydrodynamic lubrication model of infinite line contact of seawater lubricated bearing is established. The multiple mesh method and multi-grid integration method are used.The numerical solution of bearing lubrication under different factors was obtained, and the friction and wear properties of PTFE materials in seawater bath were studied by high speed ring block friction and wear test machine.Firstly, based on EHL theory, the elastohydrodynamic lubrication model of seawater lubricated bearing is established, and the distribution of film pressure and film thickness under isothermal condition are obtained by using multi-grid technique, and the pressure of seawater lubricating film under different working conditions is discussed.The distribution of film thickness and the lubricating properties of different materials under seawater lubrication were compared.Secondly, considering the effect of thermal effect and surface roughness, the complete numerical solution of micro-thermal elastohydrodynamic of seawater lubricated bearing is obtained, and the difference between the pyrolysis and isothermal solution is compared and analyzed.The variation of lubrication film pressure and film thickness with surface roughness was analyzed.Thirdly, considering the influence of thermal effect and roughness change effect, the complete numerical solution of time-varying micro-thermo-elastohydrodynamic lubrication of seawater lubricated bearing is obtained.The influence of the change of film pressure and film thickness on bearing lubrication in a time period is analyzed. The lubricating performance of bearing under different roughness parameters, rotational speed, load and other parameters is discussed.Then, the continuous impact load model is established, and the distribution of the film pressure and film thickness under the impact load is numerically simulated, and the central pressure of the lubricating film under the action of the sinusoidal periodic pulse and the triangular periodic pulse is compared and analyzed.The effects of load amplitude and pulse width on the characteristics of lubricating film are discussed.Finally, the friction coefficient of polytetrafluoroethylene (PTFE) material and nickel-plated steel ring is analyzed with rotating speed and load under the condition of full bath lubrication in seawater by using digital display high-speed ring friction and wear tester.The wear mechanism of PTFE under seawater lubrication was analyzed by means of surface topography and scanning electron microscope (SEM).
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.3

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