止推圈摩擦试验及仿真分析

发布时间：2018-09-14 08:08

【摘要】：摩擦学是研究相对运动条件下两个接触表面间的摩擦、润滑和磨损现象,同时涉及到这三者之间的联系及理论和实践过程的一门综合性学科。其涉猎的领域有很多,例如涉及到机械工程、机械制造、生物等领域的摩擦学问题。其中内外学者对滑动摩擦现象进行了许多深入的探究尤其是针对金属滑动摩擦问题。由于影响金属滑动摩擦过程的因素有很多,本文有针对性的选择影响摩擦过程中的主要因素进行摩擦试验。在考虑到金属不同表面粗糙度的前提下,与载荷、速度因素间进行正交试验,来探究三个因素间的相互作用及各因素对摩擦系数影响的显著程度与权重顺序。本文选择工程中常用的3种金属黄铜、铸铁、铝,在MMW-1A立式万能摩擦磨损试验仪上进行止推圈摩擦副试验,从而得到这一过程的平均摩擦系数并对试验结果进行极差、方差计算。结果表明,3个因素间对摩擦系数的影响程度是不同的,并且当材料不同时,因素间影响大小的排列顺序也是不同的。当摩擦副材料为黄铜、铸铁时,载荷和速度对摩擦系数的作用相比于表面粗糙度的作用程度较大;当摩擦副材料为铝时,载荷对摩擦系数的作用比表面粗糙度和速度的作用程度大。根据试验测得的结果,通过Ansys软件建立止推圈摩擦副模型,从静态、动态两个方面分析接触过程的应力状况。结果表明,接触界面在静态条件下压力分布均匀的,各向应力间呈轴向对称分布,中间应力值小,边缘大;滑动时,接触应力场在状态和数值上都发生很大变化,分布不在均匀,并且在沿着滑动方向上应力值逐渐增大。摩擦系数的改变对应力的极值有间接的作用。利用有限元法可以用来对理想接触界面摩擦过程进行模拟,进而能更加直观的看到止推圈摩擦副的受力、应力状态,从而更好的理解接触表面的摩擦学原理。
[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.
【学位授予单位】：延边大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117.1

【参考文献】