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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (5): 420643-420643.doi: 10.7527/S1000-6893.2016.0256

• Material Engineering and Vehicle Conceptual Design • Previous Articles     Next Articles

Effects of aided ice layer on electrochemical discharge drilling

DING Fei, XU Zhengyang, WANG Feng, ZHANG Yan   

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2016-07-27 Revised:2016-09-12 Online:2017-05-15 Published:2016-10-19
  • Supported by:

    National Natural Science Foundation of China (51475237);National High-tech Research and Development Program of China (2013AA040101)

Abstract:

The processing method of electrochemical discharge drilling (ECDD) is expected to achieve high efficiency machining of the difficult-to-machine material of film cooling holes without recast layer on turbine blade. In order to further improve the machining quality of hole walls, a new processing method of ECDD with ice layer filled at the bottom of the workpiece is proposed. The effects of ice layer on current and voltage waveform between tool electrode and workpiece electrode, machining efficiency, the diameter of the entrance and exit, and removal of recast layer on hole walls are analyzed. Contrast experiments between ECDD with aided ice layer and ECDD without aided ice layer are conducted. Experiment results show that the aided ice layer can help to form sufficient reverse flushing of working fluid and effectively solve the problem of working fluid leakage after penetration. After penetration of small holes, the tube electrode stays for a few seconds at the predetermined depth to increase the electrochemical dissolution time, so that the ECDD with aided ice layer can enhance the removal effect of recast layer, and is expected to achieve complete removal of entire recast layer of the wall of small holes.

Key words: aided ice layer, electrochemical discharge drilling (ECDD), waveform, machining efficiency, recast layer

CLC Number: