本文選題：海水潤滑軸承　切入點：聚四氟乙烯　出處：《青島理工大學(xué)》2012年碩士論文

【摘要】：海水具有強烈的腐蝕性，所以用海水作潤滑劑時要選取合適的材料作為摩擦副材料。本文選取具有優(yōu)異耐腐蝕能力的聚四氟乙烯材料作為海水潤滑條件下的軸瓦材料，建立了海水潤滑軸承無限長線接觸的彈流潤滑模型，利用多重網(wǎng)格法和多重網(wǎng)格積分法，得到了不同因素影響下軸承潤滑的數(shù)值解；利用高速環(huán)塊摩擦磨損試驗機對聚四氟乙烯材料在海水全浴條件下的摩擦磨損性能進(jìn)行了研究。 首先，基于彈流潤滑理論建立了海水潤滑軸承的彈流潤滑模型，，應(yīng)用多重網(wǎng)格技術(shù)得到了等溫條件下海水潤滑膜壓力和膜厚的分布；討論了不同工況下海水潤滑膜壓力、膜厚的分布，比較了不同材料在海水潤滑條件下的潤滑性能。 其次，考慮熱效應(yīng)及表面粗糙度的作用，得到了海水潤滑軸承微觀熱彈流的完全數(shù)值解；對比分析了熱解與等溫解的不同，分析了潤滑膜壓力及膜厚隨表面粗糙度各參數(shù)的變化情況。 再次，綜合考慮了熱效應(yīng)、粗糙度及時變效應(yīng)的影響，得到了海水潤滑軸承時變微觀熱彈流潤滑的完全數(shù)值解；分析了一個時間周期內(nèi)潤滑膜壓力和膜厚的變化及時變效應(yīng)對軸承潤滑的影響，討論了不同粗糙度參數(shù)、轉(zhuǎn)速、載荷等參數(shù)下軸承的潤滑性能。 然后，建立了連續(xù)沖擊載荷模型，數(shù)值模擬了沖擊載荷作用下海水潤滑膜壓力及膜厚的分布；對比分析了正弦周期脈沖及三角形周期脈沖分別作用時潤滑膜中心壓力、中心膜厚及最小膜厚隨時間變化的特性；討論了載荷幅值及脈寬對潤滑膜特性的影響。 最后，利用數(shù)顯式高速環(huán)塊摩擦磨損試驗機，分析了聚四氟乙烯材料試塊與鍍鎳鋼環(huán)在海水全浴潤滑條件下對磨時，摩擦因數(shù)隨轉(zhuǎn)速、載荷、運行時間及海水含沙量的變化情況；借助表面形貌儀、掃描電子顯微鏡對磨痕進(jìn)行了表面形貌觀察，分析了聚四氟乙烯材料在海水潤滑條件下的磨損機理。
[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).
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH133.3

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