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Research on Electrochemical Machining Process for Fine Finishing of Integral Impeller with Free-form Surface Blade
Received date: 2013-04-09
Revised date: 2013-06-06
Online published: 2013-06-24
Supported by
Aeronautical Science Foundation of China (2011ZE52055); Youth Science and Technology Innovation Fund of NUAA (NS2012012, NS2013052); Priority Academic Program Development of Jiangsu Higher Education(J0502)
An electrochemical machining (ECM) method suitable for free-form surface blades is proposed in this paper for the fine finishing operation of an integral impeller. A fractional-step method is first adopted to form a passage between adjacent blades. Then a shaping cathode is utilized to finish the blade to its requirements on the above basis. An experimental device for the electrochemical machining of blades is developed. The cathode shape is improved by the motion simulation software and the flow channel of the cathode is analyzed by a numerical simulation software during the design, so that the shape of the cathode and the electrolyte flow rate in the interelectrode meet the machining requirements. During the machining experiment, the motion path of the cathode is optimized to reduce its influence on the distribution of interelectrode gaps. A high frequency pulse power is used to reduce the interelectrode gap and improve blade machining accuracy in the experiments. The experimental results show that, the ECM process for the free-form surface blade is feasible and the precision of the machined blade in the integral impeller is significantly improved.
ZHAO Jianshe , WANG Fuyuan , XU Jiawen , LIU Yujie . Research on Electrochemical Machining Process for Fine Finishing of Integral Impeller with Free-form Surface Blade[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(12) : 2841 -2848 . DOI: 10.7527/S1000-6893.2013.0301
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