Research on the Effect of Texture on Wear Performance of High-Pressure Piston Pump Valve Pair

In this paper, the surface wear performance of the valve pair of a high-pressure axial piston pump is improved. Firstly, the friction and wear tests are carried out for different materials of the axial piston pump valve pair. Moreover, the friction and wear behavior of the valve pair contact is studied. A valve pair material that is more suitable for processing surface texture is chosen. Friction and wear models of a valve pair based on degradation coefficient are proposed and wear conditions of different textures are calculated. Lastly, the texture with the best anti-wear effect is selected. Finally, the selected textures are experimentally validated by laser processing. The results show that a long strip with a diameter of 400 μm, a depth of 20 μm, and an area ratio of 2% can effectively reduce wear. Through comparative analysis, it is concluded that the texture shape has the least influence on the wear of the valve pair. On the other hand, the area ratio of the texture has the greatest effect on the wear of the valve pair. As the diameter of the texture increases, the wear of the valve pair gradually decreases. As the texture depth increases, the wear amount of the valve pair shows a downward trend.