激光加工微凹坑轴表面对唇形密封泵吸及摩擦特性的影响

为了研究轴表面形貌对径向唇形密封泵吸作用及摩擦特性的影响,利用Nd:YAG固体脉冲激光对旋转轴表面进行微凹坑织构化处理,在油封密封试验机上,针对不同转速、不同表面形貌等工况,完成了一系列对比试验,获取了试验过程中的泵吸量、摩擦力以及密封圈温升等参数.并通过扫描电镜对试验后各密封唇表面进行了分析.结果表明:三角形微凹坑顶点朝向油液侧的表面能够增强泵吸作用,且转速对泵吸率影响很大,而其他形状和参数的微凹坑表面不利于泵吸作用的产生;与未织构面相比,圆形凹坑面积占有率为7%和21%的表面具有良好的减摩效果,三角形凹坑顶点沿周向的两表面间减摩效果较好.

Laser Textured Shaft Surfaces on the Pumping Action and Frictional Properties of Lip Seals

In order to study the influence of surface topography of shaft on pumping action and frictional properties of lip seals, the surface textures on rotary shaft are textured with a solid-state pluse Nd:YAG laser, and a series of comparison experiments under different rotational speeds, different surface topographies are conducted on an oil seal tester, some parameters such as pumping rate, friction force and temperature increment of seals during the experimental process are measured. Some lip surfaces after experiment are analyzed using scanning electron microscopy. The results show that the surface with triangular micro cavity toward oil side could enhance the pumping action, and the rotational speed plays an important role on pumping rate. The rest textured surfaces don't have positive effect on pumping action. In contrast with the surface without laser texturing, the surfaces with circle micro cavity having area densities of 7% and 21% show better friction reduction, and with triangular micro cavity lagging and leading can reduce the friction.