Influence of triboinduced films on failures and frictional behaviour of gears with particular focus on running-in processes - experimental and analytical investigations

摩擦引起的薄膜对齿轮故障和摩擦行为的影响，特别关注磨合过程 - 实验和分析研究

• 批准号: 262631975
• 负责人: Professor Dr. Michael Kopnarski
• 金额: --
• 依托单位: Lehrstuhl für Maschinenelemente
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/262631975?language=en
• 关键词: Influence; triboinduced; films; failures; frictional

The formation of triboinduced films (tribofilms) by interaction of lubricant additives with gear flank surfaces can have significant influence on the failure mechanisms and frictional behaviour of gears. While in part I of the research programme a practical and optimized running-in method for increasing the load carrying capacity of spur gears has been developed, the complex mechanisms of tribofilm formation during running-in and operation have not been considered in detail. However, since all results have shown a clear dependency on the investigated lubricant additives, in part II of the research programme the connection between formation and evolution of tribofilms with load carrying capacity and frictional behaviour of gears is investigated systematically. This requires detailed knowledge about local stresses and permissible stresses of the tribological system: On the one hand, the physical and chemical composition of the tribofilm and of the near surface region is investigated by suitable surface analysis techniques and on the other hand the local stresses are determined by means of detailed numerical simulations of the lubricated contact at the research partner IMK Magdeburg. Hence, the local formation of tribofilms on technical surfaces can be connected to the local stresses in the lubricated contact. Based on the conducted investigations, models and concepts are developed in order to clarify, which tribofilms cause high or low friction and high or low load carrying capacities in gear applications. With respect to the investigations on the load carrying capacity of gears, the focus is on the failure modes pitting and scuffing. It is also investigated, if tribofilms can have positive effects on all investigation areas (scuffing, pitting, frictional behaviour) at the same time. As tribofilms are effective solely by the use of lubricant without elaborate design modifications and additional efforts, the results of part II of the research programme make an important contribution to resource conservation. The findings of the research programme provide an approach for selecting appropriate lubricant additives and for optimising existing lubricant additive formulations for gear drive applications for the additive and lubricant manufacturers as well as for end users.

润滑油添加剂与齿轮后刀面相互作用而形成的摩擦诱导膜(摩擦膜)对齿轮的失效机理和摩擦行为有重要影响。虽然研究计划的第一部分提出了一种实用和优化的磨合方法，以提高直齿圆柱齿轮的承载能力，但没有详细考虑磨合和运行过程中摩擦膜形成的复杂机理。然而，由于所有的结果都显示出对所研究的润滑油添加剂的明显依赖性，在研究计划的第二部分中，系统地研究了摩擦膜的形成和演变与承载能力和齿轮摩擦行为之间的关系。这需要详细了解摩擦学系统的局部应力和许用应力：一方面，通过合适的表面分析技术研究摩擦膜和近表面区域的物理和化学成分，另一方面，通过研究伙伴IMK Magdeburg的润滑接触的详细数值模拟来确定局部应力。因此，技术表面上摩擦膜的局部形成可以与润滑接触中的局部应力联系起来。在已有研究的基础上，开发了模型和概念，以澄清在齿轮应用中，哪些摩擦膜导致高或低摩擦和高或低承载能力。在齿轮承载能力的研究方面，重点研究了齿轮的点蚀和胶合失效模式。如果摩擦膜可以同时对所有研究区域(擦伤、点蚀、摩擦行为)产生积极影响，也会对其进行调查。由于摩擦膜仅通过使用润滑剂有效，不需要复杂的设计修改和额外的努力，研究方案第二部分的结果对节约资源作出了重要贡献。研究方案的结果为添加剂和润滑剂制造商以及最终用户选择适当的润滑油添加剂和优化齿轮传动应用的现有润滑油添加剂配方提供了一种方法。