【作者】 陆华才；

【导师】 符永宏；

【作者基本信息】 江苏大学 ， 机械电子工程， 2005， 硕士

【摘要】 内燃机缸套—活塞环摩擦副是一个典型的摩擦学系统,其中含有多种类型的摩擦和磨损,润滑、摩擦、磨损的相互作用十分显著。其摩擦学性能对提高内燃机的可靠性和耐久性,保证内燃机经济、可靠地工作具有决定性的作用。如何解决好这对摩擦副的润滑和抗磨问题,国内外许多汽车工程技术人员,长期以来孜孜以求地投入了大量的研究工作。 本文在激光相变硬化和普通珩磨的基础上提出了利用激光热效应去除材料的方法,对缸套内表面进行激光微观造型改性复合处理的新思想,即激光珩磨。本文首先通过研究具有规则微观几何形貌表面的润滑、减磨机理,建立相应的缸套—活塞环摩擦副润滑理论数学模型,利用变异的多重网格法求解此数学模型,对缸套表面微观几何形貌设计参数进行优化匹配。其次,通过激光工艺试验,研究确定合理的激光珩磨工艺参数,在平板试样和内燃机缸套上进行激光微观造型。最后,对平面摩擦副和缸套—活塞环摩擦副进行润滑磨损实验,研究经激光珩磨后的摩擦副的润滑减摩性能,与理论研究进行比较,得出最佳的微观几何形貌参数。更多还原

【Abstract】 The tribopairs of cylinder liner piston rings in an internal combustion engine are a typical tribological system with different kinds of friction and wear in which the interactions between lubrication, friction and wear is particularly obvious. The tribological properties in the system play a significant role within the operation of engine. In order to solve the lubrication and wear-resisting problems, a lot of domestic and international automobile engineers have put into a large amount of research work seeking assiduously for a long time, still exploring so far.On the base of laser transformation hardening and mechanical honing, laser honing which can remove metal material by using laser heat effect is brought forward to processing cylinder wall. In this paper, firstly, the lubrication and wear-resisting mechanism of the surface with regular micro-structure is studied and the corresponding lubricated theory model is also developed. And then, use modified multi-grid method to solve the theory model, and cylinder wall surface micro geometry shape parameters are designed and optimized. Secondly, through the laser craft test, the rational laser honing craft parameters are determined, which are used to process the flat sample and internal-combustion engine cylinder wall. Finally, do the lubricating and wearing experiment on flat and cylinder wall, study the lubrication and wear-resisting characteristic of tribopairs by laser honing, compare with the theoretical research, draw the best micro geometry shape parameters of laser honing.更多还原