EDM Graphite

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EDM graphite, also known as graphite for electrical discharge machining, is a new type of material that is now more and more widely used in the precision mold processing industry. At present, in more than 90% of mold processing plants in developed European countries, the electrode material for processing is graphite. Copper, the once dominant electrode material, has almost lost its advantages compared to graphite electrodes. Why is this so? Because graphite has a huge advantage as a discharge...


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EDM graphite, also known as graphite for electrical discharge machining, is a new type of material that is now more and more widely used in the precision mold processing industry. At present, in more than 90% of mold processing plants in developed European countries, the electrode material for processing is graphite. Copper, the once dominant electrode material, has almost lost its advantages compared to graphite electrodes. Why is this so? Because graphite has a huge advantage as a discharge material for electric discharge machining, since the spark oil also contains C atoms, at the time of electric discharge machining, the high temperature causes the C atom in the spark oil to be decomposed, thereby forming a protective film on the surface of the EDM graphite electrode. It compensates for the loss of the graphite electrode, so the loss of the graphite electrode is small, so the service life is long.

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EDM graphite electrode advantages:
1. Processing speed is faster. In general, graphite can be processed 2-5 times faster than copper, and discharge speed is 3-5 times faster than copper.
2. The material is less prone to deformation and has obvious advantages in the processing of thin rib materials. The softening point of copper is about 1000 degrees, which is easily deformed by heat. The sublimation temperature of graphite is 3650 degrees, and the thermal expansion coefficient is only 1/30 of that of copper.
3. Lighter weight. The density of graphite is only 1/5 of that of copper. When large electrodes are subjected to electrical discharge machining, the burden on the machine tool (EDM) can be effectively reduced, and it is more suitable for application on large molds.
4. The discharge consumption is smaller. Since the spark oil also contains C atoms, at the time of electric discharge machining, the C atoms in the spark oil are decomposed at a high temperature, and a protective film is formed on the surface of the graphite electrode, thereby compensating for the loss of the graphite electrode.


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