What advantages does graphite material have over copper mold electrodes?

1. Choosing graphite as electrode material More than 90% of the electrode materials in Europe are graphite. Copper, the once-dominant electrode material, has all but lost its advantages over graphite electrodes.

二. Reasons why graphite is used as electrode:

1. Faster processing speed: under normal circumstances, the machining speed of graphite can be 2~5 times faster than that of copper; and the electric discharge machining speed is 2~3 times faster than that of copper;

2. The material is not easily deformed: it has obvious advantages in the processing of thin rib electrodes; the softening point of copper is around 1000 degrees, which is easy to be deformed by heat; the sublimation temperature of graphite is 3650 degrees; the thermal expansion coefficient is only 1/1 of that of copper 30.

3. Lighter weight: the density of graphite is only 1/5 of that of copper. When large-scale electrodes are subjected to electric discharge machining, it can effectively reduce the burden on the machine tool (EDM); it is more suitable for the application of large-scale molds.

4. The discharge consumption is smaller; because the spark oil also contains C atoms, during the discharge machining, the high temperature causes the C atoms in the spark oil to be decomposed, and then a protective film is formed on the surface of the graphite electrode, which compensates for the loss of the graphite electrode. .