EDM uses two oppositely charged electrodes namely a machining electrode and a work-piece, and then bring these electrodes closer in dielectric fluid. As the electrodes get close enough, insulation breaks down and a spark will occur, resulting temperature to reach about 12000 degrees Celsius which will melt and vaporize the material. The discharges that reveal the “spark” create the crater-like surface by removing the material. The electrode and work-piece never touch each other, and a small gap is maintained at all times. The electrical discharge machining proceeds through repetition of the above phenomenon tens to hundreds of thousand times a second.
Importantly there are few parameters need to consider in EDM are material removal rate, accuracy and surface finish. The colour degradation, change in micro hardness and heat affected zone of the material after the EDM are also important for the majority of the EDM applications.
Basically there are two types, namely die-sinking EDM and wire-cut EDM. EDM Filters Exporter
