Mr. Chenhu Yuan Profile

Chenhu Yuan

at Ningbo Institute of Materials Technology and Engineering

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Proceedings Article | 31 August 2021 Paper

Experimental study of surface quality during coaxial water-jet assisted nanosecond laser drilling

Chenhu Yuan, Haitao Wang, Jiajia Wang, Bin Wang, Wenwu Zhang

Proceedings Volume 11907, 119071W (2021) https://doi.org/10.1117/12.2603059

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As a new type of composite processing technology, coaxial water-jet assisted laser drilling (CWALD) has significant advantages in improving the surface quality of micro-holes compared with traditional laser processing. The filling drilling of the DD6 super alloy was carried out by a coaxial water-jet assisted pulsed nanosecond laser. The effects of laser pumping current, laser frequency, and water-jet velocity on the surface quality of micro-holes were studied by response surface methodology (RSM). The results of confocal microscope observation have shown that the surface quality of micro-holes decreases significantly with the increase of laser average power and laser frequency, and increases with the increase of water-jet velocity. This paper expounds on the causes of surface quality defects of micro-holes and uses the optimized process parameters to process micro-holes with low surface line roughness and good roundness.

Proceedings Article | 31 August 2021 Paper

Experimental study on micro texture processed by coaxial water assisted laser processing

Tong Liu, Chunhai Guo, Jianqiang Ma, Chenhu Yuan, Bin Wang, Xiaowen Cao, Wenwu Zhang

Proceedings Volume 11907, 119071G (2021) https://doi.org/10.1117/12.2602990

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In recent years, micro texture has been widely used in bearing and tool friction reduction. Laser machining is one of the most commonly used methods to process micro texture. Aiming at the recast layer and heat affected zone produced in laser texturing process, a water assisted laser processing technology was used to eliminate the adverse effects as much as possible. Taking 304 stainless steel as the research object, the effects of laser processing in the air and water assisted laser processing on the processing area and micro texture edge morphology were compared and analyzed. The influence of two machining methods on friction coefficient of lubrication micro texture friction pair was analyzed. The results show that the water assisted machining method reduces the heat affected zone and the cone angle of the edge. Moreover, water assisted laser processing avoids the generation of micro cracks which is very beneficial to the texture process of laser processing.

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