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首页> 外文会议>29th Leeds-Lyon Symposium on Tribology Sep 3-6, 2002 University of Leeds, UK >A Design Tool for Selection and Optimization of Surface Finish in Mixed Lubrication
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A Design Tool for Selection and Optimization of Surface Finish in Mixed Lubrication

机译：混合润滑表面光洁度的选择和优化设计工具

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摘要

This paper presents a deterministic approach developed recently for the numerical simulation of mixed EHD lubrication in rolling/sliding point contacts based on 3-D roughness measured and digitized directly from real engineering surfaces. The computer program has been proven to be robust for the entire transition from full film to mixed EHL and all the way down to boundary lubrication, or even dry contact. The simulation is capable of giving detailed results at asperity scale (or entire distribution) for the hydrodynamic and/or contact pressure, film thickness (or gap), surface and asperity deformation, subsurface stresses, friction and flash temperature at the interface, as well as load sharing between the hydrodynamic film and asperity contacts. Example cases with eight different types of surface finish, including ground, shaved, honed, chemically polished and mechanically super-finished, are analyzed under the same operating conditions. Results are compared with those from ideally smooth surfaces. Different lubrication modes due to different surface finishing processes have been observed. The effect of surface roughness/topography on the lubrication and surface contact characteristics is found to be significant. The detailed results are apparently useful for performance evaluation, efficiency and life improvement, problem diagnosis, failure prevention and production cost minimization. The computer program developed appears to be a useful engineering tool for design optimization and selection of surface finish processes.
机译：本文提出了一种确定性方法，该方法是基于从真实工程表面直接测量和数字化的3-D粗糙度，对滚动/滑动点接触中的混合EHD润滑进行数值模拟而开发的。实践证明，该计算机程序对于从全膜到混合EHL以及直至边界润滑甚至干式接触的整个过渡过程都具有很强的鲁棒性。该模拟能够以粗糙尺度（或整个分布）给出流体动力和/或接触压力，膜厚度（或间隙），表面和粗糙变形，表面下应力，界面处的摩擦和飞边温度的详细结果作为流体动力薄膜和粗糙接触之间的负载分担。在相同的工作条件下，对具有八种不同类型的表面光洁度的示例案例进行了分析，包括磨光，刨光，珩磨，化学抛光和机械超抛光。将结果与理想光滑表面的结果进行比较。观察到由于不同的表面处理工艺而产生的不同的润滑方式。发现表面粗糙度/形貌对润滑和表面接触特性的影响是显着的。详细的结果显然对性能评估，效率和寿命改善，问题诊断，故障预防以及生产成本最小化很有用。开发的计算机程序似乎是用于设计优化和表面处理选择的有用的工程工具。

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