表面波纹度和凹坑对线接触弹流润滑的影响

发布时间：2018-11-28 12:29

【摘要】：由于加工误差和表面损伤等,轴承零件表面会出现不同的表面形貌,表面凹坑和波纹度严重影响线接触表面的润滑性能。采用系统法求解高载和低载下波纹表面和凹坑表面的润滑膜压力和膜厚以及表层Mises应力,发现表面波纹度会使油膜压力出现波动,压力波峰处的压力值会大于光滑接触表面的油膜压力,表面会出现应力集中,高载时波纹度的影响更明显;表面凹坑会使凹坑两侧出现尖锐的压力峰,表面凹坑两侧出现肿块;当凹坑在接触中心时,油膜压力对凹坑深度非常敏感,较小的凹坑深度就会导致油膜崩溃;而出口区的凹坑会使二次压力峰移动到凹坑靠近接触中心的一侧,而且峰值压力远大于正常接触压力,凹坑处有局部高应力和严重的应力集中,高载时较小的凹坑深度会引起相对更明显的压力峰和应力集中。
[Abstract]:Due to machining errors and surface damage, different surface morphologies appear on the surface of bearing parts, and surface pits and corrugation seriously affect the lubrication performance of linear contact surfaces. The lubrication film pressure, film thickness and surface Mises stress of corrugated surface and pit surface under high and low loads are calculated by systematic method. It is found that the surface ripple will cause oil film pressure to fluctuate. The pressure at the peak of the pressure wave will be greater than the oil film pressure of the smooth contact surface, and the stress concentration will appear on the surface, and the effect of corrugation is more obvious when the load is high. When the pit is in the contact center, the oil film pressure is very sensitive to the depth of the pit, and the smaller pit depth will lead to the collapse of the oil film, while the surface pit will cause sharp pressure peak on both sides of the pit and a lump on both sides of the surface pit, when the pit is in the contact center, the oil film pressure is very sensitive to the depth of the pit. The pit in the outlet area will move the secondary pressure peak to the side near the contact center, and the peak pressure will be far greater than the normal contact pressure, and there will be local high stress and serious stress concentration in the pit. At high load, smaller pit depth will cause more obvious pressure peak and stress concentration.
【作者单位】：浙江大学机械工程学系;
【基金】：国家高技术研究发展计划(863计划)(2015AA043002) 国家自然科学基金项目(51375436)
【分类号】：TH117.2

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