Effects of Shielding Coatings on the Anode Shaping Process during Counter-rotating Electrochemical Machining

查看全文 作　　者：WANG [1]Dengyong;ZHU [1]Zengwei;WANG [1]Ningfeng;ZHU [1]Di

机构地区：[1]College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics

出　　处：《Chinese Journal of Mechanical Engineering》索引2016年第29卷第5期,共6页

基　　金：Supported by Program for New Century Excellent Talents in University,China(Grant No.10-0074) 摘　　要：Electrochemical machining(ECM) has been widely used in the aerospace, automotive, defense and medical industries for its many advantages over traditional machining methods. However, the machining accuracy in ECM is to a great extent limited by the stray corrosion of the unwanted material removal. Many attempts have been made to improve the ECM accuracy, such as the use of a pulse power, passivating electrolytes and auxiliary electrodes. However, they are sometimes insufficient for the reduction of the stray removal and have their limitations in many cases. To solve the stray corrosion problem in CRECM, insulating and conductive coatings are respectively used. The different implement processes of the two kinds of coatings are introduced. The effects of the two kinds of shielding coatings on the anode shaping process are investigated. Numerical simulations and experiments are conducted for the comparison of the two coatings. The simulation and experimental results show that both the two kinds of coatings are valid for the reduction of stray corrosion on the top surface of the convex structure. However, for insulating coating, the convex sidewall becomes concave when the height of the convex structure is over 1.26 mm. In addition, it is easy to peel off by the high-speed electrolyte. In contrast, the conductive coating has a strong adhesion, and can be well reserved during the whole machining process. The convex structure fabricated by using a conductive iron coating layer presents a favorable sidewall profile. It is concluded that the conductive coating is more effective for the improvement of the machining quality in CRECM. The proposed shielding coatings can also be employed to reduce the stray corrosion in other schemes of ECM. 关键词：COUNTER-ROTATING electrochemical machining stray corrosion insulating coating conductive coating

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Effects of Shielding Coatings on the Anode Shaping Process during Counter-rotating Electrochemical Machining

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