科研之友
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摘要
Axial piston pumps are widely used under severe conditions because they are able to operate highly efficiently at high pressure and various ranges of speed. However, pump efficiency is relatively low at low speed because of insufficient lubrication. The contact between the port plate and cylinder barrel is critically important because insufficient lubrication from this pair causes rapid wear and high friction loss which significantly reduces pump efficiency. Ring-on-disc testing was conducted to investigate the friction and wear behaviours of the port plate-cylinder barrel contact. Four types of surface finishing processes were used: coarse grinding, fine grinding, polishing, and laser texturing. A confocal laser scanning microscope and energy dispersive spectroscopy were used to examine the surface. Results indicate that the polished surfaces have the best tribological performance. Finely ground surfaces have lower wear but higher friction than coarsely ground surfaces. The number and size of the brass particles transferred to the steel surface are related to the surface topography. Laser textured surfaces have the highest friction and wear. Brass particles aggregate inside micro-dimples. Increasing contact pressure does not change the wear mechanism but increases abrasion.
