The graphite electrode material characteristics are as follows: 1.CNC machining speed is fast, cutting property is high, dressing is easy, graphite machining speed is fast, 3-5 times of copper electrode, precision machining speed is especially outstanding, and its strength is very high, for ultra-high (50-90mm), ultra-thin (0.2-0.5mm) electrode, processing deformation is not easy. And in many cases, the product needs to have good surface effect, this request as far as possible when doing the electrode to make the overall public electrode, and the whole public electrode production when there is a variety of contact Angle, due to the nature of graphite is easy to repair, make this problem be solved easily, and greatly reduce the number of electrodes, and the copper electrode is impossible.

2. Light weight and low cost. In the production cost of a set of molds, CNC machining time, EDM time and electrode loss account for the vast majority of the total cost, which are all determined by the electrode materials themselves. Compared with copper, the machining speed and EDM speed of graphite are 3 ~ 5 times of copper. At the same time, the characteristics of minimal wear and the production of the whole graphite electrode can reduce the number of electrodes, thus reducing the consumables and machining time of the electrode. All of these can greatly reduce the production cost of the mold.

3. Rapid EDM forming, small thermal expansion, low loss, because the conductivity of graphite is better than copper, so its discharge speed is faster than copper, 3~5 times. And its discharge can withstand a large current, edM rough machining more favorable. At the same time, the weight of graphite is 1/5 times that of copper under the same volume, which greatly reduces the load of EDM. For the manufacture of large electrode, the overall electrode has a great advantage. The sublimation temperature of graphite is 4200℃, 3~4 times that of copper (the sublimation temperature of copper is 1100℃). At high temperature, the deformation is minimal (1/3~1/5 of copper under the same electrical conditions), and does not soften. The discharge energy can be transferred to the workpiece in high efficiency and low consumption. Because the strength of graphite is enhanced at high temperature, the discharge loss (graphite loss is 1/4 of that of copper) can be effectively reduced, which ensures the processing quality.