Graphite material has the advantages of high machining accuracy and good surface effect, especially in precision, complex, thin wall, high hardness material mold cavity processing has a greater advantage.
Graphite material has the advantages of high machining accuracy and good surface effect, especially in precision, complex, thin wall, Gao Ying material mold cavity processing has a greater advantage. Compared with copper, graphite material has the advantages of less consumption, high discharge speed, light weight, small thermal expansion coefficient, etc. Therefore, it has become the mainstream of the discharge machining materials.
One, fast speed;
Graphite discharge faster than copper 2-3 times, the material is not easy to deformation, in the processing of thin reinforced electrode have obvious advantages, copper softening point in 1000, easily due to thermal deformation and graphite sublimation temperature is about 36.5 degrees, compared with, the graphite material thermal expansion coefficient only copper 1 / 30.
Two, light weight;
When the density of graphite is only 1/5, the large electrode can reduce the load of machine tool (EDM), and it is more suitable for the application of large scale mold;
Three, the loss of small;
Because the spark oil contains C atoms, in the discharge process, the high temperature leads to the C atoms in the spark oil is broken down, and the surface of the graphite electrode to form a protective film, which compensates the loss of the graphite electrode;
Four, no burr;
Copper electrode in the end of the process, it is necessary to manually remove the burr, and graphite processing without burr, which not only saves a lot of cost and manpower, but also easier to achieve automated production;
Five, Because the cutting resistance of graphite copper is only 1/5, more easily by hand grinding and polishing operation