As the time and energy of the impulse increases, the loss of weight of the aluminium alloy will increases as a result when using EDM-electric discharge mashing methods.
Hi Dr. Khalid:
During EDM (Electro discharge machining), pulsed DC results in the intense electric field at the location where surface asymmetry gives the narrowest gap. Negatively under the influence of the electric field forces, the charged particles (electrons) break loose from the cathode surface and move towards the anode surface. During this movement, the electrons crash into the neutral molecules of the dielectric. Electrons also separate from these neutral molecules of the dielectric resulting in more ionization. The ionization directly becomes so intense that an extremely narrow channel of continuity is established. There is an increasing flow of a large number of electrons towards the anode, and that of ions towards the cathodes, their kinetic energy is converted into heat energy, therefore, heating of anode is due to the bombardment of electrons and heating of cathode due to the bombardment of ions take place, Thus, it ends up in momentary current impulse resulting in temperature of the tool and workpiece to such a high value, that it results either in melting, or melting as well as vaporization of a small amount of materials, from the surface of both electrodes at the point of spark contact.
Best Regards
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