Hydraulic valve spools can be produced with hollow structures using SLM to increase dynamic response. The contact between the valve spool and body is crucial and relates to the performance of a hydraulic valve, which has not been studied. This paper investigates the reciprocating contact of an SLM-fabricated spool valve from a tribological aspect. By varying the process parameters, porous and standard spool samples (18Ni-300 steel) were produced using SLM. The lubricating behaviours of 18Ni-300 samples under various contact pressures and reciprocating frequencies were investigated in comparison to a real spool sample (hardened 38CrMoAl steel) using conventional manufacturing. The results indicate that the standard SLM 18Ni-300 spool sample has comparable tribological performance compared to the conventional manufactured 38CrMoAl sample. The SLM fabricated sample, with a number of large pores, has the highest friction coefficient under a wide range of contact conditions due to rough surfaces and cracks. Compared to the standard sample, the presence of a few small pores positively affects lubrication by providing local extra lubrication and serving as debris containers. Such an effect becomes very notable under low pressure, reducing the friction coefficients by half.

液压阀芯可以使用SLM制成空心结构，以提高动态响应。阀芯和阀体之间的接触至关重要，并且与液压阀的性能有关，尚未进行研究。本文从摩擦学的角度研究了SLM制成的滑阀的往复接触。通过改变工艺参数，使用SLM生产了多孔和标准线轴样品（18Ni-300钢）。与使用常规制造的实际线轴样品（硬化的38CrMoAl钢）相比，研究了18Ni-300样品在各种接触压力和往复频率下的润滑行为。结果表明，与常规制造的38CrMoAl样品相比，标准SLM 18Ni-300线轴样品具有可比的摩擦学性能。SLM制成的样品具有许多大孔，由于粗糙的表面和裂纹，因此在宽范围的接触条件下具有最高的摩擦系数。与标准样品相比，一些小孔的存在通过提供局部额外润滑并用作碎屑容器，对润滑产生了积极影响。这种作用在低压下变得非常显着，将摩擦系数降低了一半。