CNC machining speed, cutting, easy dressing: high speed milling rough machining a copper block 3 times, high speed milling finishing a copper block 5 times, and its strength is very high, for high (50-90mm) ultrathin (0.2 0.5 mm) of the electrode, processing is not easy to deform. Many times the product needs to have good ruled surface effect, which requires to do the whole of the electrode and in the production of the whole electrode exists all sorts of hidden corner cleaning, due to the characteristics of graphite is easy to repair, making this problem is easy to solve, and greatly reduce the electrode number, can realize the complex geometry, and copper is unable to do so
Rapid EDM molding, thermal expansion is small, low loss: because the conductivity of the graphite is better than copper, so it is faster than the rate of copper, copper, 3-5 times. And the discharge can withstand the larger current, electric spark rough machining more favorable. At the same time, under the same volume, the graphite weight is 1/5 times of copper, which greatly reduces the load of EDM. For the production of large electrodes, the overall electrode has a great advantage. The sublimation temperature of graphite is 4200 for copper 3-4 times (the sublimation temperature of copper is 1100). At high temperature, the deformation is very small (under the same electrical conditions for copper 1/3-1/5) is not softened. Can be efficient, low consumption of the discharge energy transfer to the workpiece. Because of the high temperature strength of graphite, the discharge loss (1/4) can be reduced effectively, and the quality of the process can be ensured.
Light weight, low cost, production costs for a set of mold, electrode CNC machining time, EDM, electrode wear accounted for overall body most, and these are determined by the electrode material itself. Graphite and copper are compared, the machining speed and CDM speed of graphite are 3-5 times of copper. At the same time, the characteristics of wear minimum and the overall graphite production, can reduce the number of electrodes, but also reduces the electrode material and machining time. All of these can reduce the production cost of the mold.
