Electronic sintered graphite mold

The electronic sintered graphite mold requires high purity, the content of fixed carbon is more than 85%, and the content of harmful impurities is less than 1%. In recent years, high-speed milling has broken through the limitations of traditional milling which is difficult to process high-hard, high-strength, and high-toughness mold materials. However, EDM has high machining accuracy and high surface quality, and a wide range of machining, especially in mold cavity machining of complex, precise, thin-walled, narrow, hard materials. The advantages of high-speed milling are incomparable. EDM will still be the main method for mold cavity processing. Graphite electrodes (compared with copper) have advantages such as less electrode consumption, fast electrical discharge processing speed, good machining performance, light weight, and small thermal expansion coefficient, and have gradually replaced copper electrodes as the mainstream of electro-machined electrodes. Compared with copper, graphite electrodes have the advantages of less consumption, fast discharge speed, light weight, and small thermal expansion coefficient. Therefore, they have gradually replaced copper electrodes as the mainstream of electrical discharge machining electrodes. In contrast, graphite electrode materials have the following advantages:

1, fast speed: graphite discharge is 2-3 times faster than copper, the material is not easy to deform, the advantages of processing thin rib electrodes is obvious, the softening point of copper is about 1000 degrees, easily deformed due to heat, the sublimation temperature of graphite is At about 3650 degrees, the thermal expansion coefficient of graphite materials is only 1/30 of that of copper materials.

2. Light weight: The density of graphite is only 1/5 of that of copper. When large electrodes are used for electrical discharge machining, it can effectively reduce the load on the machine tool (EDM), and is more suitable for large mold applications. 3. Low loss: Because the spark oil contains C atoms. During electrical discharge machining, the high temperature causes the C atoms in the spark oil to be decomposed, and a protective film is formed on the surface of the graphite electrode, which compensates for the loss of the graphite electrode.

4. No burrs: After the copper electrodes are processed, they need to be removed manually, while graphite is processed without burrs, which not only saves a lot of cost and labor, but also makes it easier to realize automated production.

5. Easy polishing: As the cutting resistance of graphite is only 1/5 of that of copper, it is easier to manually grind and polish.

6. Low cost: Due to the continuous rise in the price of copper in recent years, the price of isotropic graphite is lower than copper; the price of graphite products is 30 to 60% lower than copper in the same volume. Stable, short-term price fluctuations are relatively small.