| || Electrochemical Discharge Machining Process
Author : Kulkarni, Anjali V.
Source : Defence Science Journal ; Vol:57(5) ; 2007 ; pp 765-770
Subject : 669 Metallurgy;620.1 Material Science and Technology
Keywords : Electrochemical spark machining;Spark-assisted chemical engraving;EDM;ECM;Electrochemical machining;Transient measurements;Temperature profile;Surface topography;Micromachining;Electrochemical discharge machining
Abstract : Electrochemical discharge machining process is evolving as a promising micromachining process. The experimental investigations in the present work substantiate this trend. In the present work, in situ, synchronised, transient temperature and current measurements have been carried out. The need for the transient measurements arose due to the time-varying nature of the discharge formation and time varying circuit current. Synchronised and transient measurements revealed the discrete nature of the process. It also helped in formulating the basic mechanism for the discharge formation and the material removal in the process. Temperature profile on workpiece and in electrochemical discharge machining cell is experimentally measured using pyrometer, and two varieties of K-type thermocouples. Surface topography of the discharge-affected zones on the workpiece has been carried out using scanning electron microscope. Measurements and surface topographical studies reveal the potential use of this process for machining in micron regime. With careful experimental set-up design, suitable supply voltage and its polarity, the process can be applied for both micromachining and micro-deposition. It can be extended for machining and or deposition of wide range of materials.