表面织构技术对高水基液压马达滑靴副摩擦学性能影响研究

发布时间：2018-05-09 21:33

本文选题：乳化液 + 滑靴副　；参考：《中国矿业大学》2017年硕士论文

【摘要】：高水基液压马达中的滑靴副作为马达关键摩擦副之一,以乳化液为润滑介质,运行在重载、低速的工况下,极易导致滑靴副因摩擦磨损失效。表面织构技术有近三十年的研究历史,广泛应用于活塞环耐磨研究,流体减阻与机械密封等方面。本文针对高水基液压马达滑靴副的摩擦磨损问题,应用表面织构技术改善了滑靴副的摩擦学性能。主要以滑靴副的三种工况为研究对象,分别对应全流体润滑状态、干摩擦状态、混合润滑状态。采用Fortran、ANSYS、LS-DYNA等数值分析软件,优化设计织构参数并分析织构表面滑靴副的摩擦学性能,最后实验研究了织构表面滑靴副的摩擦学性能。首先,分析在正常工作条件下织构表面滑靴副的润滑性能。研究的参数主要包括织构形状、织构占有率、织构深度、液膜厚度,表征润滑性能的参数为平均液膜压力、摩擦系数、液膜压力分布曲线、液膜压力分布云图等。研究结果表明:最佳织构占有率为0.5,最佳织构深度比液膜厚度略大,最佳织构中心距为1000μm,最佳织构形状为圆柱形织构。其次,分析在马达启动时刻织构表面滑靴副的摩擦学性能和热力学性能。研究的参数为织构占有率、织构深径比、织构形状以及载荷,表征摩擦学性能与热力学性能的参数为接触应力、等效应力、应力分布云图、温度-时间曲线、温度分布云图等。研究结果表明:当织构占有率为0.12、深径比为0.2、形状为圆柱形时,滑靴副在该工况下的摩擦学与热力学性能最好。再次,分析了在马达制动或超载时刻织构表面滑靴副的摩擦学性能。研究结果表明:在该工况条件下,织构表面滑靴副在流体动压润滑阶段持续时间较长,上下试样碰撞次数与碰撞时间均较少,在稳定运行阶段滑靴副的上试样等效应力较小。最后,实验研究了最佳织构参数的织构表面滑靴副的摩擦学性能。通过对比分析可知,在极限载荷条件下,织构表面摩擦副的摩擦学性能较差,摩擦磨损严重。当载荷适当时,织构表面摩擦副的摩擦学性能均优于光滑表面摩擦副的摩擦学性能,尤其是在运行高速的条件下。
[Abstract]:As one of the key friction pairs in the high water base hydraulic motor, the slipper pair is easy to lose due to friction and wear when the emulsion is used as the lubricating medium under the condition of heavy load and low speed. Surface texture technology has a history of nearly 30 years. It is widely used in wear resistance research of piston ring, fluid drag reduction and mechanical seal. In this paper, the friction and wear problem of high water base hydraulic motor slipper pair is studied. The surface texture technique is used to improve the tribological performance of the slipper pair. The three working conditions of the slipper pair are taken as the research object, corresponding to the full fluid lubrication state, the dry friction state and the mixed lubrication state respectively. By using Fortrann ANSYSLS-DYNA and other numerical analysis software, the texture parameters were optimized and the tribological properties of textured surface slipper pairs were analyzed. Finally, the tribological properties of textured surface slipper pairs were studied experimentally. Firstly, the lubrication performance of textured surface slipper pair is analyzed under normal working conditions. The main parameters studied include texture shape, texture occupancy, texture depth, liquid film thickness, average film pressure, friction coefficient, liquid film pressure distribution curve, liquid film pressure distribution cloud diagram and so on. The results show that the optimum texture occupancy is 0.5, the optimum texture depth is slightly larger than the liquid film thickness, the optimum texture center distance is 1000 渭 m, and the optimum texture shape is cylindrical texture. Secondly, the tribological and thermodynamic properties of the textured surface slipper pair at the starting time of the motor are analyzed. The parameters studied are texture occupancy, texture depth / diameter ratio, texture shape and load. The parameters that characterize the tribological and thermodynamic properties are contact stress, equivalent stress, stress distribution cloud diagram, temperature-time curve, temperature distribution cloud diagram, etc. The results show that when the ratio of texture is 0.12, the ratio of depth to diameter is 0.2, and the shape is cylindrical, the tribological and thermodynamic properties of the pair are the best under this condition. Thirdly, the tribological properties of textured surface slipper pairs during motor braking or overload are analyzed. The results show that under this condition, the texture surface slipper pair lasts longer in hydrodynamic lubrication stage, and the impact times and time of upper and lower samples are less, and the equivalent stress of the upper sample is smaller in the stable running stage. Finally, the tribological properties of the texture surface slipper pair with optimum texture parameters are studied experimentally. Through comparison and analysis, it can be seen that the tribological properties of textured surface friction pairs are poor and the friction and wear are serious under the condition of limit load. When the load is appropriate, the tribological properties of textured surface friction pairs are better than those of smooth surface friction pairs, especially at high speed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.51;TH117

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