Speed is fast
Graphite discharge 2-3 times faster than copper, the material is not easy to deformation, obvious advantages on thin steel electrode processing, the softening point of copper in 1000 degrees, easy to produce deformation because of the heat, the sublimation of graphite temperature of 3650 degrees or so, by contrast, only 1/30 of the copper graphite material coefficient of thermal expansion.
The density of graphite is only 1/5 of copper, large electrode in EDM, can effectively reduce the burden of machine tools (EDM), the application of more suitable for large mould.
Because the spark oil contains C atoms, in edm, high temperature lead to spark came out of the oil C atoms are broken down, and on the surface of graphite electrode form a protective film, compensate the loss of the graphite electrode.
Copper electrode at the end of the process, still need to manually remove the burr, the graphite processed without burr, this not only saves a lot of cost and manpower, but also easy to realize automatic production.
Due to only 1/5 of the copper graphite cutting resistance, operation easier to grinding and polishing by hand.
The cost is low
Due to the copper price is rising in recent years, now, all aspects of gay graphite price is lower than that of copper; Under the same volume of graphite products price is thirty percent lower than the copper to 60, the price is stable, short-term price fluctuations was relatively small.