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| Process of Turbine Blade Film Cooling Holes by Nanosecond and Femtosecond Laser Pulses |
| JIANG Qilin, CAO Kaiqiang, CHEN Long, FENG Chaopeng, JIA Tianqing, SUN Zhenrong |
| (State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China) |
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Abstract To meet the demand of strict process of turbine blade film cooling holes in aero-engine, a method was proposed and a system was set up based on nanosecond laser and femtosecond laser pulses. A 3D scanner was used to compensate errors of coordinates accurately in process of film cooling holes. Combining high-efficiency feature of 532nm nanosecond laser with high-precision feature of 400nm femtosecond laser, eighty-one film cooling holes were processed in each of stainless-steel turbine blades. Deviations of the diameter are kept within 10μm and the position errors are no more than 50μm. Profiles of film cooling holes are in good condition and no resolidified layer or microcracks are found under the detection of industrial computer tomography and high magnification microscope. High-quality film cooling holes are processed with no interference.
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2021, 
