Friction reduction in lubricated tribological contacts by micro textured surfaces

通过微纹理表面减少润滑摩擦接触中的摩擦

• 批准号: 426217784
• 负责人: Professorin Dr.-Ing. Marion Merklein
• 金额: --
• 依托单位: Lehrstuhl für Fertigungstechnologie (LFT)
• 依托单位国家: 德国
• 项目类别: Research Grants (Transfer Project)
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/426217784?language=en
• 关键词: Friction; reduction; lubricated; tribological; contacts

The modification of component surfaces in lubricated tribological systems can improve the tribological behavior and reduce friction losses. This can be achieved by tribological layers or by discrete microtextures applied to the component surface. With regard to larger quantities, these microtextures have to be realized by forming processes such as micro coining, which can be integrated into conventional manufacturing processes. Up to now, basic knowledge is missing in order to understand the manufacturing challenges in combined forming processes during component production. In addition, a deeper understanding of the effects as well as the optimal design of surface microtextures in lubricated tribological contacts is lacking.The aim of the research project is to gain basic scientific knowledge with regard to the effect of surface microtextures in EHL contacts, as well as their manufacturability using forming processes. In cooperation with industrial partners, the obtained basic knowledge is transferred to industrial applications. A more realistic determination of the effects of microtextures in rolling-sliding contacts is achieved by the expansion of a TEHL simulation model by the influence of thin layers, roughness and solid-solid contact as well as dynamic operating conditions. Exemplary for the cam/tappet-contact, over the cup surface locally optimized microtextures are derived, taking into account the manufacturing limitations. Latter are investigated for an extrusion-coining process, in which a more homogeneous and precise texture shaping on the component by an inverse texture optimization is strived. In addition, a combined process including deep drawing, ironing and coining which has a lower material flow in the coining area is compared with the extrusion process. The objective is to identify process-specific influencing variables on the texture shape. In addition, the wear behavior of the coining punches is examined using a wear test-rig. The overriding objective of the study is to gain knowledge on the achievable accuracy of the texture geometry as well as on the application behavior of the tools based on numerical models and simplified bench tests. The analysis of the application behavior of the components in terms of friction and wear in a complete test chain from model, over component, to aggregate testing-rigs serves to validate the numerical design. Finally, the obtained knowledge about suitable and simultaneously technically feasible microtextures is validated for different application cases using experimental setups.

润滑摩擦学系统中组件表面的修饰可以改善摩擦学行为并减少摩擦损失。这可以通过摩擦学层或应用于组件表面的离散微织物来实现。关于较大的数量，必须通过形成诸如微插入之类的过程来实现这些微织物，这些过程可以集成到常规的制造过程中。到目前为止，基本知识一直缺乏，以了解组件生产过程中组合过程中的制造挑战。此外，还缺乏对润滑摩擦学接触中表面微作用的最佳表面微织物的最佳理解。研究项目的目的是就EHL接触中的表面微作用以及使用形成过程的制造性获得基本的科学知识。与工业合作伙伴合作，获得的基本知识已转移到工业应用。通过薄层，粗糙度和固相接触的影响以及动态的工作条件，通过扩展TEHL模拟模型以及动态的操作条件，可以实现微纹理在滚动触点中的影响更现实的确定。考虑到制造局限性，cam/tappet接触的示例是局部优化的微织物的示例性。对后者进行了挤压过程，其中通过反质地优化对组件的质地形成更加均匀，更精确的纹理。此外，将材料流中的材料流较低的组合过程与挤压过程进行了比较。目的是识别特定过程的影响变量对纹理形状。此外，使用磨损测试 - 检查了套装打孔的磨损行为。该研究的重要目标是获得有关基于数值模型和简化基准测试的纹理几何形状以及工具的应用行为的知识。从模型，多个组件到骨料测试-RIGS的完整测试链中，对组件的应用行为的分析可用于验证数值设计。最后，使用实验设置对不同的应用程序案例进行了验证有关合适和同时在技术上可行的微纹解的知识。