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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (10): 3457-3464.doi: 10.7527/S1000-6893.2015.0191

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Processing method of blade root of blisk based on principle of electrochemical sweep shaping

WANG Fuyuan1, ZHAO Jianshe2   

  1. 1. School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng 224051, China;
    2. College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2015-05-26 Revised:2015-06-25 Online:2015-10-15 Published:2015-07-07
  • Supported by:

    National Natural Science Foundation of China (51405418); Open Foundation of Non-traditional Machining Key Laboratory of Shaanxi Province; Aeronautical Science Foundation of China (2011ZE52055)

Abstract:

The machining residual will be formed at the blade root after the blisk is processed by the electrochemical machining (ECM) method by the sheet or tubular cathode because of the influences of the movement and shape of the cathode, and it will reduce the machining precision of the blisk. In order to remove the residual at the root of the blade after electrochemical machining, the electrochemical machining scheme on blade root is carried out. Firstly, the machining scheme is determined according to the residual distribution and the structure of the channel. Secondly, the cathode structure is developed and the processing paths are calculated. The sector structure is adopted in the flow path and the flow velocity distribution is analyzed; therefore, the flow field of the cathode is improved by adding the drainage, changing the angle and other measures. The processing paths are optimized and the motion interference and the NC program are verified by the special-purpose simulation software. The lack resulting from the difference between the width of the channel and the width of the front edge of the cathode is compensated by the increase of additional rotation of the blisk. Finally, the ECM unit is made and the electrochemical machining tests about the root are carried out and verify the method. The result proves that the residual is effectively removed at the blade root and the surface quality and the processing accuracy meets the requirements.

Key words: integral impeller, electrochemical machining, sweep shaping, path optimization, cathode design, flow field analysis

CLC Number: