Dr. Bin Wang Profile

Dr. Bin Wang

at CNITECH

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Publications (4)

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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.

Proceedings Article | 2 December 2020 Paper

Strong coupling numerical simulation study on nanosecond pulsed laser ablation of K4002 superalloy

Bin Wang, Yihui Huang, Haitao Wang, Wenwu Zhang

Proceedings Volume 11717, 117172Z (2020) https://doi.org/10.1117/12.2587471

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A complete strong coupling numerical model is proposed to investigate the nanosecond pulsed laser ablation (PLA) mechanism of aviation K4002 superalloy. In the numerical model, the incident pulsed laser energy is considered as the surface heat flux with Gaussian distribution both in time and space. Deformation mesh and mesh reconstruction technique are utilized to track the ablation-induced boundary recession. In a time-step the iterations between the solution of temperature field and the boundary recession continue until the convergence is obtained, so as to realize the complete strong coupling. More over the laser-induced heat flux has always been bonded with the recession boundary, and the temperature-dependent material properties are also taken into account. The experimental research is carried out to validate the accuracy of the model, experimental and simulation results show good agreement in terms of ablation depth. Base on the model the PLA mechanism of K4002 superalloy is studied, the evolution of temperature field, the ablation zone morphology, the heat affected zone, and the recast layer formation are analyzed. The strong coupling effect in laser ablation process is fully embodied in the model, and the simulation is improved effectively, which provides an effective analysis method for the ablation mechanism of pulsed laser. The proposed model is of great significance to help us understand the mechanism of pulsed laser ablation and the optimization of processing parameters for PLA fabrication.

Proceedings Article | 2 December 2020 Paper

Strong coupling numerical simulation study on nanosecond pulsed laser ablation of K4002 superalloy

Bin Wang, Yihui Huang, Haitao Wang, Wenwu Zhang

Proceedings Volume 11717, 117172Z (2020) https://doi.org/10.1117/12.2587471

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