【摘要】：摩擦學(xué)是研究相對(duì)運(yùn)動(dòng)條件下兩個(gè)接觸表面間的摩擦、潤滑和磨損現(xiàn)象,同時(shí)涉及到這三者之間的聯(lián)系及理論和實(shí)踐過程的一門綜合性學(xué)科。其涉獵的領(lǐng)域有很多,例如涉及到機(jī)械工程、機(jī)械制造、生物等領(lǐng)域的摩擦學(xué)問題。其中內(nèi)外學(xué)者對(duì)滑動(dòng)摩擦現(xiàn)象進(jìn)行了許多深入的探究尤其是針對(duì)金屬滑動(dòng)摩擦問題。由于影響金屬滑動(dòng)摩擦過程的因素有很多,本文有針對(duì)性的選擇影響摩擦過程中的主要因素進(jìn)行摩擦試驗(yàn)。在考慮到金屬不同表面粗糙度的前提下,與載荷、速度因素間進(jìn)行正交試驗(yàn),來探究三個(gè)因素間的相互作用及各因素對(duì)摩擦系數(shù)影響的顯著程度與權(quán)重順序。本文選擇工程中常用的3種金屬黃銅、鑄鐵、鋁,在MMW-1A立式萬能摩擦磨損試驗(yàn)儀上進(jìn)行止推圈摩擦副試驗(yàn),從而得到這一過程的平均摩擦系數(shù)并對(duì)試驗(yàn)結(jié)果進(jìn)行極差、方差計(jì)算。結(jié)果表明,3個(gè)因素間對(duì)摩擦系數(shù)的影響程度是不同的,并且當(dāng)材料不同時(shí),因素間影響大小的排列順序也是不同的。當(dāng)摩擦副材料為黃銅、鑄鐵時(shí),載荷和速度對(duì)摩擦系數(shù)的作用相比于表面粗糙度的作用程度較大;當(dāng)摩擦副材料為鋁時(shí),載荷對(duì)摩擦系數(shù)的作用比表面粗糙度和速度的作用程度大。根據(jù)試驗(yàn)測(cè)得的結(jié)果,通過Ansys軟件建立止推圈摩擦副模型,從靜態(tài)、動(dòng)態(tài)兩個(gè)方面分析接觸過程的應(yīng)力狀況。結(jié)果表明,接觸界面在靜態(tài)條件下壓力分布均勻的,各向應(yīng)力間呈軸向?qū)ΨQ分布,中間應(yīng)力值小,邊緣大;滑動(dòng)時(shí),接觸應(yīng)力場(chǎng)在狀態(tài)和數(shù)值上都發(fā)生很大變化,分布不在均勻,并且在沿著滑動(dòng)方向上應(yīng)力值逐漸增大。摩擦系數(shù)的改變對(duì)應(yīng)力的極值有間接的作用。利用有限元法可以用來對(duì)理想接觸界面摩擦過程進(jìn)行模擬,進(jìn)而能更加直觀的看到止推圈摩擦副的受力、應(yīng)力狀態(tài),從而更好的理解接觸表面的摩擦學(xué)原理。
[Abstract]:Tribology is a comprehensive subject which studies the friction, lubrication and wear between two contact surfaces under the condition of relative motion. At the same time, it involves the relationship between the three and the theoretical and practical processes. It involves many fields, such as tribology in mechanical engineering, mechanical manufacturing, biology and so on. Domestic and foreign scholars have made a lot of in-depth research on sliding friction, especially for metal sliding friction. As there are many factors that affect the sliding friction process of metals, this paper selects the main factors that affect the friction process to carry out friction tests. On the premise of considering different surface roughness of metals, orthogonal experiments with load and velocity factors were carried out to explore the interaction between the three factors and the significance and weight order of the influence of each factor on the friction coefficient. In this paper, three kinds of metal brass, cast iron and aluminum, which are commonly used in engineering, are selected to test the friction pair of thrust ring on MMW-1A vertical universal friction and wear tester, thus the average friction coefficient of this process is obtained and the test results are very different. Variance calculation. The results show that the influence degree of the three factors on the friction coefficient is different, and when the material is different, the order of influence between the three factors is also different. When the friction pair material is brass and cast iron, the effect of load and speed on friction coefficient is greater than that of surface roughness, and when the friction pair material is aluminum, The effect of load on friction coefficient is greater than that on surface roughness and velocity. According to the experimental results, the friction pair model of thrust ring is established by Ansys software, and the stress state of contact process is analyzed from static and dynamic aspects. The results show that the pressure distribution of the contact interface is uniform under the static condition, the stress distribution in each direction is axisymmetric, the value of the intermediate stress is small and the edge is large, and the contact stress field changes greatly in the state and value of the contact stress field during sliding. The distribution is not uniform and the stress value increases gradually along the sliding direction. The change of friction coefficient has an indirect effect on the extreme value of stress. The finite element method can be used to simulate the friction process of the ideal contact interface, and then the force and stress state of the friction pair of the thrust ring can be seen more intuitively, so that the tribological principle of the contact surface can be better understood.
【學(xué)位授予單位】：延邊大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH117.1

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