Recommended for Nanjing VC sintered graphite mould:
1. Easy polishing: because the cutting resistance of graphite is only 1 / 5 of that of copper, it is easier to carry out technical grinding and polishing in operation;
2. Low cost: due to the rising price of copper in recent years, the price of isotropic graphite is lower than that of copper; Under the same volume, the price of graphite products is 30-60% lower than that of copper, the price is relatively stable, and the short-term price fluctuation is relatively small.
3. Light weight: the density of graphite is only 1 / 5 of that of copper. When large electrodes are used for EDM, it can effectively reduce the burden of machine tools (EDM), and is more suitable for the application of large molds;
4. Fast speed: Graphite discharges 2-3 times faster than copper. The data is not easy to deform. It has significant advantages in the processing of thin rib electrode. The softening point of copper is about 1000 degrees,
It is easy to deform due to heating. The increasing temperature of graphite is about 3650 degrees. In comparison, the thermal expansion coefficient of graphite is only 1 / 30 of that of copper;
5. Burr free: after processing, the copper electrode needs to be deburred, while there is no burr after graphite processing, which not only saves a lot of cost and manpower, but also makes it easier to complete automatic production;
6. Low loss: because the spark oil contains C atoms, during EDM, the high temperature causes the C atoms in the spark oil to be differentiated, and a protective film is formed on the surface of the graphite electrode to compensate the loss of the graphite electrode;
