EDM

EDM is the abbreviation of the English term Electrical Discharge Machining, referring to electrical discharge machining. In the EDM industry—specifically the mold-making sector—graphite raw materials are used to fabricate graphite electrodes for electrical discharge machining, leveraging graphite’s conductive properties.

         EDM is the fourth most popular machining method, following turning, grinding, and milling. Compared with traditional copper electrodes, EDM using isostatically pressed graphite offers the following advantages:
 

1. Graphite of the same volume costs only 25% of that of a copper electrode.
 

2. Graphite machining is 3–5 times faster than copper electrode machining, and the machined surface is smooth.
 

3. High machining accuracy and easy to polish.
 

4. Graphite has a bulk density only one-fifth that of copper electrodes, making it more suitable for manufacturing large electrodes.
 

5. When used as an electrode in electrical discharge machining, its consumption is only 1/3 to 1/5 that of a copper electrode, and the carbonized decomposition products of the dielectric fluid coat the electrode, thereby compensating for electrode wear.