本文選題：表面織構(gòu)　切入點：微溝槽　出處：《南京航空航天大學》2011年碩士論文

【摘要】：在當今世界低碳經(jīng)濟的大背景下,提高效能、減少排放成為經(jīng)濟發(fā)展的前提,因此機械設備中廣泛存在的摩擦、磨損和潤滑問題日益受到關注。表面織構(gòu)技術(shù)在降低摩擦、減小磨損、改善潤滑、提高承載力等方面的優(yōu)異表現(xiàn),使之慢慢進入人們的視野,逐漸成為解決摩擦磨損問題的一種手段。其中溝槽型表面織構(gòu)由于其加工方便、價格低廉等特點,成為最具工業(yè)應用潛力的一種表面織構(gòu)形式。本文以溝槽型表面織構(gòu)為研究對象,通過試驗和數(shù)值分析的方法獲得了微溝槽在往復運動條件下對摩擦性能的影響規(guī)律,并且進行了減摩機理分析,為溝槽型表面織構(gòu)的設計提供了依據(jù),將進一步擴大其工業(yè)應用范圍。 本文采用光刻及微細電解加工技術(shù)在硼銅鑄鐵材料表面加工出微小溝槽陣列,使用往復式摩擦磨損試驗機研究其在面面接觸時的減摩性能。以往復行程的平均摩擦因數(shù)作為評價指標,分別研究了溝槽寬度、深度、面積密度和方向各因素在不同接觸壓強和曲柄轉(zhuǎn)速條件下對摩擦副摩擦性能的影響規(guī)律。借助有限元分析工具對微溝槽存在時的摩擦情況進行數(shù)值計算分析。使用ANSYS軟件分析了摩擦副相對運動時微溝槽結(jié)構(gòu)的應力分布情況。使用FLUENT軟件分析了潤滑油膜的壓力分布及流動情況。結(jié)合有限元分析結(jié)果和試驗結(jié)果,對微溝槽的減摩機理進行分析和總結(jié)。 本文研究結(jié)果表明:溝槽寬度、深度、面積密度和方向等因素對摩擦副的摩擦性能影響顯著,只有參數(shù)合適的微溝槽才能夠起到減摩作用;其中方向因素是最重要的一個因素,不同方向的微溝槽其作用機理不盡相同。 本文還對微溝槽表面織構(gòu)的減摩機理進行了分析和總結(jié): 1、90°溝槽(即溝槽方向與相對運動方向垂直)在流體動壓潤滑狀態(tài)下能夠產(chǎn)生顯著的流體動壓承載力,從而得到較低的摩擦因數(shù)。 2、0°溝槽(即溝槽方向與相對運動方向平行)在部分摩擦副表面發(fā)生直接的固體接觸時,能夠避免在棱邊出產(chǎn)生應力集中現(xiàn)象,減小摩擦副表面粗糙微凸起的相互接觸和變形程度。 3、0°溝槽內(nèi)部的潤滑油在往復運動產(chǎn)生的壓力差作用下,會源源不斷地流入摩擦界面中,為摩擦副提供潤滑,起到減小摩擦的作用。 4、45°左右的溝槽發(fā)揮出了各種減摩機理的積極作用,在各種減摩作用的綜合作用下,其試驗中的減摩效果最為顯著。
[Abstract]:Under the background of low carbon economy in today's world, improving efficiency and reducing emissions become the prerequisite of economic development. Therefore, the widespread problems of friction, wear and lubrication in machinery and equipment are paid more and more attention to. Surface texture technology is reducing friction. To reduce wear, improve lubrication, increase bearing capacity and other excellent performance, make it slowly into people's view, gradually become a means to solve the problem of friction and wear, among which groove surface texture because of its easy processing, Because of its low price, it has become a kind of surface texture with the most potential for industrial application. In this paper, the surface texture of grooves is studied. By means of experiments and numerical analysis, the influence of micro-grooves on friction performance under reciprocating motion is obtained, and the anti-friction mechanism is analyzed, which provides a basis for the design of groove surface texture. The scope of industrial application will be further expanded. In this paper, micro groove arrays were fabricated on the surface of boron copper cast iron by photolithography and micro electrolysis machining. The friction reduction performance of the reciprocating friction and wear test machine was studied by means of surface contact. The width and depth of grooves were studied with the average friction coefficient of reciprocating stroke as the evaluation index. The effect of various factors of area density and direction on friction performance of friction pairs under different contact pressures and crank speeds is studied. The friction of micro-grooves in the presence of micro-grooves is numerically calculated and analyzed by means of finite element analysis tools. The stress distribution of micro-grooves in the relative motion of friction pairs is analyzed by ANSYS software, the pressure distribution and flow of lubricating oil film are analyzed by FLUENT software, and the results of finite element analysis and test are combined. The antifriction mechanism of microgrooves is analyzed and summarized. The results show that the width, depth, area density and direction of the grooves have a significant effect on the friction performance of the friction pairs, and only the micro-grooves with appropriate parameters can reduce friction. The directional factor is the most important factor, and the mechanism of the microgrooves in different directions is different. The antifriction mechanism of microgroove surface texture is also analyzed and summarized. The 90 擄grooves (i.e. the grooves are perpendicular to the relative direction of motion) can produce a significant hydrodynamic bearing capacity under hydrodynamic lubrication, thus obtaining a lower friction coefficient. (2) when direct solid contact occurs on the surface of some friction pairs (i.e. the groove direction is parallel to the relative motion direction), the stress concentration phenomenon can be avoided at the edge of the groove. The degree of contact and deformation of rough and micro-protruding surface of friction pair is reduced. Under the pressure difference caused by reciprocating motion, the lubricating oil inside the 0 擄grooves will continuously flow into the friction interface, providing lubrication for the friction pair and reducing the friction. The grooves of about 45 擄play a positive role in the anti-friction mechanism. Under the comprehensive action of various anti-friction effects, the anti-friction effect of the grooves in the experiment is the most remarkable.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH117

【引證文獻】

相關期刊論文 前1條

1 尹必峰;錢晏強;董非;盧振濤;;溝槽型織構(gòu)摩擦學性能模擬及試驗研究[J];潤滑與密封;2012年12期

相關碩士學位論文 前1條

1 曲申生;階梯型形貌潤滑機理的研究[D];青島理工大學;2012年

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本文編號：1674735