Improved Electro Discharge Machining
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
In Electro Discharge Machining (EDM), voltage pulses are applied at suitable intervals across two electrodes, where one of the electrodes is a workpiece. The electrodes are immersed in a liquid dielectric. When the voltage pulses are applied, the dielectric breaks down and discharge formations occur across the gap between the two electrodes. Materials are removed from the electrodes and craters are formed in them, where the crater size is proportional to the discharge energy. Roughness of the machine parts is reduced by reducing the crater size, which in turn is achieved by reducing the discharge energy. A capacitive discharge power supply system is described using a blocking capacitor and a diode serially connected with a resistor, the series diode-resistor connection being in parallel across the workpiece - tool electrodes.