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

基本信息

项目摘要

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.
对润滑摩擦系统中的构件表面进行改性处理,可以改善摩擦学性能,降低摩擦损失。这可以通过摩擦层或通过施加到部件表面的离散微纹理来实现。对于更大的数量,这些微纹理必须通过成形工艺实现,例如微压印,其可以集成到传统的制造工艺中。到目前为止,基本知识是缺失的,以了解在组件生产过程中组合成形工艺的制造挑战。此外,对润滑摩擦接触中表面微织构的影响以及优化设计缺乏更深入的了解,本研究项目的目的是获得关于EHL接触中表面微织构影响的基础科学知识,以及它们使用成形工艺的可制造性。通过与工业合作伙伴的合作,将获得的基础知识转移到工业应用中。一个更现实的确定在滚动-滑动接触的微观织构的影响,实现了由薄层,粗糙度和固-固接触以及动态操作条件的影响的TEHL模拟模型的扩展。示例性的凸轮/挺杆接触,在杯表面上的局部优化的微观纹理的推导,考虑到制造的限制。后者是针对挤压-压印工艺进行研究的,其中通过逆纹理优化来努力在部件上形成更均匀、更精确的纹理。此外,还将拉深、变薄和精压的复合工艺与挤压工艺进行了比较,结果表明,复合工艺在精压区的材料流动较小。其目的是确定特定工艺的纹理形状的影响变量。此外,使用磨损试验台检查压印冲头的磨损行为。这项研究的首要目标是获得知识的纹理几何形状的可实现的精度,以及基于数值模型和简化的台架试验的工具的应用行为。在从模型到组件再到集料试验台的完整试验链中,对组件在摩擦和磨损方面的应用行为进行分析,以验证数值设计。最后,所获得的知识,适当的,同时技术上可行的显微纹理验证不同的应用情况下,使用实验装置。

项目成果

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Professorin Dr.-Ing. Marion Merklein其他文献

Professorin Dr.-Ing. Marion Merklein的其他文献

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{{ truncateString('Professorin Dr.-Ing. Marion Merklein', 18)}}的其他基金

Enhancement of joinability and joint characteristics in mechanical joining processes by tailor heat-treated aluminium semi-finished products
通过定制热处理铝半成品,增强机械连接工艺中的可连接性和连接特性
  • 批准号:
    454200985
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Fundamental investigation of ultrasonic-assisted forming of metallic materials under compression and shear loading
压缩和剪切载荷下金属材料超声辅助成形的基础研究
  • 批准号:
    393723186
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Laser assisted strategies for the manufacturing of property-enhanced Tailor Heat Treated Blanks
用于制造性能增强的定制热处理毛坯的激光辅助策略
  • 批准号:
    386418429
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Consideration of functionally relevant geometric deviations in the design of metal forming processes for the production of gears by extrusion
在挤压生产齿轮的金属成形工艺设计中考虑功能相关的几何偏差
  • 批准号:
    290266411
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Units
Tailored Carburization: Adjusted mechanical Properties in blank plane and blank thickness direction
定制渗碳:调整毛坯平面和毛坯厚度方向的机械性能
  • 批准号:
    283715217
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Lubricant free forming with tailored tribological conditions
在定制的摩擦条件下进行无润滑成型
  • 批准号:
    282248914
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Contribution to an efficient FE-based design of magnesium sheet parts
有助于镁板零件基于有限元的高效设计
  • 批准号:
    227979140
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Lubricant free forming with tailored tribological conditions
在定制的摩擦条件下进行无润滑成型
  • 批准号:
    244843181
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Mechanical joining of dissimilar materials by shear clinching processes without pre-punching (shear clinching)
通过剪切铆接工艺机械连接异种材料,无需预冲孔(剪切铆接)
  • 批准号:
    227633773
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Hochdruck-Blechumformung maßgeschneiderter Halbzeuge unter Anwendung magnetorheologischer Flüssigkeiten als kombiniertes Wirk- und Dichtmedium
使用磁流变液作为活性和密封组合介质对定制半成品进行高压金属板材成型
  • 批准号:
    211256090
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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