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In wire EDM wire as a tool electrode, copper and copper alloy, steel or hard material is applied between the workpiece 60 ~ 300V pulse voltage and keeps the 5 ~ 50um gap, the gap is filled with kerosene, pure an insulating medium such as water, the electrode and the spark discharge between the workpiece and each is consumed, corrosion pitting on the surface of the workpiece countless pits, NC-controlled by monitoring and control, servo bodies, so that the colors uniform discharge phenomenon, the workpiece to be processed so as to make it meet the requirements of size and shape precision products.
EDM physical principles are as follows:
In order to produce spark between two electrodes, the two electrodes between which the voltage must be higher than the gap (electrode - workpiece) Breakdown voltage is determined by:

A) The distance between the electrode and the workpiece;
2) an insulating dielectric fluid capacity (water resistivity);
3) gap pollution (corrosive waste).
The discharge point of the first occurrence of the strongest electric field, which is a complex process; freedom in the presence of positive ions and electrons accumulate rapidly ionized to form a conductive path; at this stage, a current between the two plates. Causes numerous collisions between particles occurs, to form a plasma, and soon raised to 8000-12000 degrees Celsius, the two conductor surface instantly melt some materials, and because the electrode and the dielectric liquid is vaporized to form a bubble, rules and its rise until the pressure is very high; then current is interrupted, the temperature suddenly reduced, causing air bubble implosion, the power generated to melt the material thrown out of the crater, and then etching the dielectric material in the re-condensed liquid into small spheres , dielectric fluid was discharged; etching the electrode and the workpiece to the problem of asymmetric, depending on the thermal conductivity electrode, the melting point, density, duration, and the discharge occurs on the electrode is called loss occurs in said workpiece for removing material.