Femtosecond laser processing of slide valve pair surface micro-texture research

Cr₁₂MoV mold steel is one of the important materials for the slide valve pair in aerospace electromechanical servo mechanism. In order to reduce the frictional resistance of the relative contact surfaces of the slide valve pair and improve the transmission efficiency and reliability of the mechanism, a femtosecond laser was used to process micro-texture in the sliding interface of the valve core of the slide valve pair. First of all, in the Cr₁₂MoV mold steel sample surface processing of different depths and morphology of the micro-texture, the use of laser confocal microscopy on the processed surface micro-texture depth and morphology of the test analysis, optimization of the laser processing parameters of the microtexture, and then the optimized laser processing parameters were used to process the micro-texture at the sliding interface of the valve core of the slide valve pair. The results show that: when the single pulse energy is lower than 16.86μJ, the Cr₁₂MoV mold steel can not be effectively removed and processed; when the laser scanning speed is greater than 200mm/s, and the filler spacing is greater than 0.01mm, the texture morphology is incomplete and the bottom roughness is too large. Finally, the laser processing parameters of single pulse energy 16.86μJ, filling spacing 0.01mm and scanning speed 200mm/s were selected to process micro-texture on the sliding interface of the sliding valve auxiliary valve core. Laser confocal microscopy showed that the micro-texture morphology of the valve core sliding interface was complete, the texture depth was about 10μm, and the roughness Ra of the texture bottom was 1.66μm-2.33μm.