圆形微凹坑织构对动压滑动轴承润滑性能的影响

发布时间：2018-04-26 04:42

本文选题：滑动轴承 + 表面织构　；参考：《河南科技大学》2017年硕士论文

【摘要】：滑动轴承是支撑轴类零件并使承载面间能作相对滑动的重要机械元件。滑动轴承的摩擦磨损是影响轴承寿命、轴承工作效率的重要因素。表面织构技术对降低缸套、活塞环、轴承和刀具等接触润滑表面的摩擦、磨损效果显著。但目前针对滑动轴承内圆表面微圆凹坑织构对轴承摩擦润滑特性的研究甚少。基于理论分析和试验验证,本文对圆形微凹坑织构动压滑动轴承的摩擦润滑性能展开深入研究,为圆形微凹坑织构动压滑动轴承的应用和优化设计奠定新的理论基础。根据流体动压润滑机理,建立含有圆形微凹坑织构的动压滑动轴承数学模型。推导圆形微凹坑织构动压滑动轴承油膜厚度方程;讨论二维Reynolds方程的应用和边界条件;对偏微分方程和求解区域网格进行离散化处理;采用有限差分法和松弛迭代法求解Reynolds方程。以上述理论为基础对圆形微凹坑织构动压滑动轴承模型进行数值解析。基于MATALB平台,设计织构化动压滑动轴承油膜压力,承载力和摩擦力的求解程序;辨明圆形微凹坑织构轴承油膜厚度、压力分布形式和原理;探究织构分布位置,织构间距,织构深度及其排布形式等对动压润滑轴承油膜压力分布,承载力及运转摩擦力的影响规律。研究表明,织构在升压区时,动压滑动轴承能取得较好的减摩增润效果;织构深度为5~15μm时,轴承压力分布更优;轴承最大可以减小8.1%的摩擦力;织构间距为200μm,深度为8μm,织构交叉排布时,轴承的综合承载、减摩润滑性能最优。最后,对圆形微凹坑织构动压滑动轴承进行摩擦试验研究。选择黄铜和轴承钢两种材料,采用激光加工方法分别制备6种不同参数的圆形微凹坑织构试件;在M-2000型摩擦磨损试验机上进行摩擦磨损试验;分析不同织构试件的减摩润滑效果。试验表明,对于确定的工况,多个织构单元试件的减摩效果优于单个织构单元试件;相同织构尺寸和数量组成的不同织构排列形式对试件的减摩润滑效果也不同。
[Abstract]:Sliding bearing is an important mechanical element that supports shaft parts and can make relative sliding between the bearing surface. The friction and wear of the sliding bearing is an important factor affecting the life of the bearing and the working efficiency of the bearing. The surface texture technology is very effective in reducing the friction of the contact lubrication surface of the cylinder liner, piston ring, bearing and cutting tool. On the basis of theoretical analysis and test verification, the frictional lubrication performance of circular micro pits is deeply studied, and a new theoretical basis is laid for the application and optimization of circular micro pits texture dynamic bearing. Based on the hydrodynamic lubrication mechanism, a mathematical model of dynamic pressure sliding bearing containing circular micro pits is established. The oil film thickness equation of the circular micro pits is derived. The application and boundary conditions of the two-dimensional Reynolds equation are discussed; the partial differential equation and the solution of the regional grid are discretized; the finite difference method and the finite difference method are used. The Reynolds equation is solved by the relaxation iterative method. Based on the above theory, the dynamic pressure sliding bearing model of circular micro pits is numerically analyzed. Based on the MATALB platform, the solution program for the oil film pressure, bearing capacity and friction of the textured dynamic pressure sliding bearing is designed, and the oil film thickness, the pressure distribution form and the original form of the circular micro pit texture bearing are identified. The influence of texture distribution position, texture spacing, texture depth and arrangement form on the oil film pressure distribution, bearing capacity and running friction force of dynamic pressure lubricated bearings is investigated. The study shows that the dynamic pressure sliding bearing can achieve better Mo Zengrun effect when the texture is in the rising area; the pressure distribution of the bearing is better when the texture depth is 5~15 u. The maximum of the bearing can be reduced by 8.1% of the friction force; the spacing of the texture is 200 m, the depth is 8 mu m. When the texture is crossed, the bearing's comprehensive bearing and the friction reducing performance are optimal. Finally, the friction test of the circular micro dent texture dynamic sliding bearing is studied. Two materials of brass and bearing steel are selected and 6 kinds of laser processing methods are used to prepare 6 kinds of materials respectively. The circular micro pits of different parameters are used to test the texture of the micropits; the friction and wear tests of the M-2000 friction and wear tester are carried out. The friction reducing effect of different textured specimens is analyzed. The test shows that the friction reducing effect of several textured elements is better than the single texture single piece for the determined condition. The effect of texture arrangement on friction and lubrication of specimens is also different.

【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.31

【参考文献】