Research On Tribological Properties Of Partially Textured Thrust Bearings With Circular Grooves

As an important mechanical component,thrust bearing has a significant impact on the working efficiency and safety of mechanical equipment.Under the service conditions of the thrust bearing,especially under severe working conditions,the bearing surface is not effectively lubricated,resulting in severe friction,which causes grinding and burning problems.In order to effectively improve the tribological properties of the thrust bearing surface and prolong its service life,this topic applies the surface texturing technology to the thrust bearing,and prepares the circular groove texture in the inlet area of the fan-shaped tile surface.Through the combination of theoretical analysis and experimental research,the influence of geometric parameters of circular groove texture on the bearing capacity of thrust bearing oil film is studied,and the mechanism of lubrication and friction reduction is explored.Firstly,based on the geometry characteristics,service conditions of the thrust bearing and the mass conservation cavitation boundary conditions,the theoretical model for lubrication of partially textured thrust bearings with circular grooves is established.The multi-grid method was used to solve the pressure distribution and bearing capacity of the lubricating oil.Based on this,the influence of the geometric parameters and distribution law of the circular groove texture on the bearing capacity is analyzed.The results show that the partial circular groove texture is set in the entrance area of the thrust bearing fan-shaped tile,and a convergent wedge-shaped gap is formed along the moving direction,so that the oil film generates additional bearing capacity,which is similar to Reyleigh step bearing and Tilting thrust bearing.By optimizing the geometric parameters and distribution rules of the circular groove texture,the film bearing capacity of the thrust bearing surface can be effectively improved.Secondly,in order to actively design the partial circular groove texture,45 steel material is used as the target material.The experimental study on the laser forming process of circular groove texture was carried out systematically,and the influence of laser processing parameters on the depth,width and processing quality of the groove texture was analyzed.The study found that current,scanning speed,repetition frequency and repeat times have different effects on texture depth,width and processing quality.Reasonable selection of laser processing parameters can achieve high-quality circular groove texture.Finally,with reference to the laser process test results,the groove texture of different size parameters is actively designed on the surface of the thrust ring sample.Combined with the actual situation of the thrust bearing,the rotary tribological test was carried out on the MMW-1A friction and wear tester to study the effect of the circular groove texture geometry on the surface lubrication and anti-friction performance under different working conditions.The results show that the friction reduction effect of the circular groove texture is different under different contact pressure and speed conditions.Reasonable optimization of the texture geometry can reduce the friction coefficient of the thrust bearing surface by 27.3%.As the rotational speed increases,the optimal texture depth gradually increases.Under high speed conditions,partial circular groove texture lubrication and anti-friction effect is better than the full texture.This research work not only has certain scientific significance in theoretical research,but also has a positive guiding value for the engineering application of textured thrust bearings.