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| Optimization and Comparison of Trimming Parameters of Leading and Trailing Edges of Aero-Engine Blade by Vibration Aided EDM |
| SONG Tao, LONG Jin, YAN Buyun, WANG Xiaoying, MA Liangqi, YU Zuyuan |
| (School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China) |
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Abstract To correct the dimensional and shape errors of leading and trailing edges of aero-engine blade after electrochemical machining (ECM), experiments of rough machining in trimming process are carried out by electrical discharge machining (EDM). In vibration aided EDM, the discharge gap and pressure in the gap varies, resulting in debris escaping easily, leading to the stable process and improvement of machining efficiency. To obtain the optimal machining parameters in rough trimming of edges of aero-engine blade by EDM, extensive cutting experiments of GH4169 with dimensions of 29×29×0.5mm3 have been carried out. Based on primary experimental results, orthogonal experimental design is used to study the effects of peak current, pulse width, amplitude and frequency of vibration on material removal rate (MRR). The optimum processing parameters of GH4169 nickel base alloy are pulse on-time of 4μs, peak current of 30A, vibration amplitude of 1.2μm, vibration frequency of 1200Hz, and MRR is up to 10.86mm3 /min. The influence of different workpiece materials on the experimental results is studied by single factor experimental method under the same processing parameters.
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2020, 
