tailieunhanh - Investigation on the influence of the dielectrics on the material removal characteristics of EDM

(BQ) A systematical and comprehensive investigation of the material removal characteristics of the electrical discharge machining (EDM) process using various dielectrics as the working fluids was conducted in this work. Five dielectrics, including gaseous dielectrics, air and oxygen, and liquid dielectrics, de-ionized water, kerosene and water-in-oil (W/O) emulsion were used as the working fluids. | Journal of Materials Processing Technology 214 (2014) 1052–1061 Contents lists available at ScienceDirect Journal of Materials Processing Technology journal homepage: Investigation on the influence of the dielectrics on the material removal characteristics of EDM Yanzhen Zhang, Yonghong Liu ∗ , Yang Shen, Renjie Ji, Zhen Li, Chao Zheng College of Electromechanical Engineering, China University of Petroleum, Dongying 257061, China a r t i c l e i n f o Article history: Received 24 January 2013 Received in revised form 9 December 2013 Accepted 19 December 2013 Available online 28 December 2013 Keywords: EDM Crater Dielectric Material removal Bubble a b s t r a c t A systematical and comprehensive investigation of the material removal characteristics of the electrical discharge machining (EDM) process using various dielectrics as the working fluids was conducted in this work. Five dielectrics, including gaseous dielectrics, air and oxygen, and liquid dielectrics, de-ionized water, kerosene and water-in-oil (W/O) emulsion were used as the working fluids. The whole geometry parameters of the craters, including the recast material in the craters, were precisely determined by metallographic method. The volume of melted and removed material and removal efficiency in different dielectrics were comparatively investigated. By relating the material removal characteristics to the evolution of the discharge generated bubbles in different dielectrics which was done by computer simulation, it seems that the pressure above the discharge point is an important factor that can affect material removal characteristics. The results of this work were supposed to be helpful for further clarifying the complicated material removal mechanism of EDM. © 2014 Elsevier . All rights reserved. 1. Introduction Electrical discharge machining (EDM) is a widely used manufacturing technology in the industry application. Both electric conductive and .