The surface modification technology affects the friction and wear resistance of the piston/cylinder pair in axial piston pumps. However, in the early operating stages, the bearing surface cannot provide optimal load-bearing and lubrication conditions, resulting in a high wear rate and rapid loss of the surface modification layer. In this paper, the variation in wear of the piston/cylinder pair with the operating time is obtained by a wear degradation model. The wear contour at the lowest wear rate is derived to guide the design of a pre-machined surface contour. The experimental results show that the pre-machined contour reduces the wear rate during the initial operating stage, with the surface modification layer covering the pre-machined surface playing a greater role.

表面改性技术影响轴向柱塞泵中活塞/缸副的摩擦磨损性能。然而，在早期运行阶段，轴承表面不能提供最佳的承载和润滑条件，导致磨损率高，表面改性层快速流失。在本文中，活塞/气缸副的磨损随工作时间的变化是通过磨损退化模型获得的。导出最低磨损率的磨损轮廓以指导预加工表面轮廓的设计。实验结果表明，预加工轮廓在初始运行阶段降低了磨损率，覆盖预加工表面的表面改性层发挥了更大的作用。