Study On Improving Non-fluid Lubrication Performance By Surface Texturing

ABSTRACT:It is important to enhance tribological properties of friction pairs under non-fluid lubrication in some extreme work conditions. Surface texture technology is developed to improve the non-fluid lubrication performance. A series of regular arrays of dimples are machined on friction surfaces by laser, to investigate the role of laser surface texture playing on wear resistance and solid lubrication.Dry sliding friction tests were applied to investigate the influence of geometric parameters of surface textures, substrate materials, surface hardness, and testing conditions on the textured friction pairs. The results showed that substrate materials and surface hardness affected the wear resistance of friction pairs significantly. For45steel rings (HRC40) and12Cr blocks (HRC52), laser surface texture could improve the wear resistance of friction pairs. Load and rotate speed, in a certain range, affected the wear loss of specimens but didn’t overturn the result that laser surface texture could reduce wear loss of friction pair.Solid lubricating tests were applied to investigate the influence of geometric parameters of surface textures, substrate materials, preparation of solid films and testing conditions on synergy of surface textures and solid lubrication. It was found that substrate materials had significant effects on synergy of surface textures and solid lubrication. Solid lubricanting films prepared by different method had different efficiency of wear life enhancement. Laser surface texture could extend the wear life of solid films. The wear life of solid films increased with the incresing of dimple depth and area density. And smaller value of dimple diameter led longer wear life of solid films.A simple contact model of friction pair with surface textures and solid lubrication was developed to simulate sliding friction of the friction pair. Contact stress distribution was obtained to analyze effects of surface textures and solid lubrication on tribological properties.The present research work analyzed the influence and mechanism of laser surface texture on non-fluid lubrication, which provided a theoretical basis and testing support for surface texture’s application to non-fluid lubrication.