EDM mold

Electric spark is a kind of self-excitation discharge. Its characteristics are as follows: There is a high voltage between the two electrodes of the spark discharge before the discharge. When the two electrodes are close to each other, the spark discharge occurs immediately after the dielectric is punctured. With the breakdown process, the resistance between the two electrodes decreases sharply, and the voltage between the two electrodes decreases sharply. The spark channel must be extinguished in time after it has been maintained for a short period of time (usually 10-7-10-3s), in order to maintain the "cold pole" characteristic of the spark discharge (that is, the thermal energy converted from the channel energy is too late to be transmitted to the electrode depth), so that Channel energy acts on a very small range. The effect of channel energy can make the electrode locally corroded. The method of dimensional processing of materials by using the corrosion phenomenon generated during spark discharge is called electric discharge machining. EDM is a spark discharge in a liquid medium in the lower voltage range.