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| Experimental Research on Femtosecond Laser Polishing of GH4099 Honeycomb Core |
| CHEN Feng1, LIU Qiaomu2, DU Peng2, HU Zengrong3 |
1. State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. AVIC Gas Turbine Establishment, Chengdu 610500, China;
3. School of Urban Rail Transportation, Soochow University, Suzhou 215131, China |
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Abstract The femtosecond laser “cooling” polishing method was proposed for processing of metallic honeycomb core under air atmosphere. The polishing process parameters were optimized by the two sliding-level method, and process window prediction model of GH4099 sheet was determined firstly. The set of optimal process parameters for least surface roughness combined with processing efficiency is an off-focus distance of 0.2mm, a laser powder of 0.3W, a scanning space of 10μm, and a scanning speed of 2.3m/s. Under this condition, the surface roughness of GH4099 honeycomb core specimen decreased by 65%, and the polishing efficiency is 1.2h/(210mm×210mm).
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2019, 
