Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (5): 110-116.doi: 10.3969/j.issn.1000-565X.2016.05.017

• Mechanical Engineering • Previous Articles     Next Articles

A Probe into Multi-Physics Coupling in Electrochemical Machining Process of Square Holes in Titanium Alloys

HE Ya-feng1,2 LU Wen-zhuang1 GAN Wei-min2,3   

  1. 1.College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China; 2.Digital Electrochemical Machining Key Laboratory of Jiangsu Province,Changzhou 213002,Jiangsu,China; 3.College of Mechanics and Vehicle,Changzhou Institute of Technology,Changzhou 213002,Jiangsu,China
  • Received:2015-11-20 Revised:2016-01-23 Online:2016-05-25 Published:2016-04-12
  • Contact: 卢文壮(1972-)，男，教授，博士生导师，主要从事现代加工技术研究． E-mail:meewzlu@nuaa.edu.cn
  • About author:何亚峰(1975-)，男，博士生，主要从事电解加工技术研究． E-mail:460465979@ qq． com
  • Supported by:
    Supported by the National Natural Science Foundation of China(51275230) and the Science and Technology Support Industry Project of Jiangsu Province(BE2014051)

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Abstract: In order to further improve the quality and precision of electrochemical machining,by taking the machi- ning of square roles in titanium alloys as the research object,firstly,a multi-physics coupling mathematical model describing the electrochemical machining of square holes is established,which fully takes into consideration the mutual relationship among electric field,flow field and temperature field.Secondly,the distributions of square role's multi-physics coupling electrochemical machining potential,machining depth,flow velocity,bubble ratio and temperature gradient are obtained via numerical simulations.Then,the variations different physical parameters with time are discussed.Finally,electrochemical machining experiments of square holes in titanium alloys are carried out,and the influence of electrolyte inlet pressure on processing quality is investigated.The results show that (1) electrochemical machining is an interaction process of electric field,flow field and temperature field; (2) the measured square role contour accords well with the theoretically-calculated one; and (3) with the increase of processing time,the machining depth and cone angle become larger,the flow rate in the processing area decreases,while the bubble rate as well as the temperate gradient increases.

Key words: electrochemical machining, square hole, titanium alloys, multi-physics coupling, gas-liquid two- phase flow