The results of laboratory tests on a laser-modified surface layer of the bore of a cast-iron valve guide for an internal combustion engine, which operates with a valve stem, are presented. To improve its macro- and micro-geometry, ablative laser micromachining was applied. By using various processing parameters, characteristic oil micro-reservoirs were created in the upper and lower zones of the guide bore. The processing was carried out using an Nd:YAG laser (1064 nm) with a special focusing system. The topography of the surface shaped by traditional mechanical processing—reaming and honing—was compared with that modified as a result of ablative laser micromachining. To select the optimal parameters for laser micromachining, surface topography studies, analysis of microstructure and chemical composition in micro-areas, and microhardness measurements were conducted.EXPLOATIONAL BOOST DURABILITY OF ELEMENTS ASSOCIATION, VALVE SHAFT – VALVE GUIDE OF COMBUSTION ENGINE
WITH LASER TECHNOLOGY
The laboratory investigations of outer layer, the hole of the cast-iron valvular runner of the combustion engine, co-operating with the handle of the valve, modified by laser and their results are presented. In the aim of the improvement her macroand micro-geometry, ablational laser microtooling was applied. Characteristic oil microcontainers were created in the upper and bottom area of the runner hole owing to applying various parameters of the process. The processing was conducted by the laser Nd: YAG (1064 nm) with special focusing system.
The topography of surface shaped by traditional mechanical process; reaming and honing, and modified in the result of laser ablation microtooling was compared.
The investigation of the surface topography, analysis of microstructure and chemical composition in microfields with the microhardness measurements were conducted as the optimum laser microtooling parameters selectio. (…)
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