The technical characteristics of graphite electrodes mainly include the following aspects:
Fast processing speed: The EDM speed of graphite electrodes is 2~3 times faster than that of copper electrodes, and the material is not easy to deform during processing, which is particularly suitable for the processing of thin rib electrodes. The thermal expansion coefficient of graphite is only 1/30 of that of copper, so it has little deformation at high temperatures and is suitable for processing ultra-high (50~90mm) and ultra-thin (0.2~0.5mm) electrodes.
Light weight: The density of graphite is only 1/5 of that of copper, which can effectively reduce the burden of machine tools during EDM of large electrodes, and is particularly suitable for the application of large molds.
Low loss: During EDM, the carbon atoms in the spark oil decompose at high temperatures and form a protective film on the surface of the graphite electrode, reducing the loss of the electrode. In addition, graphite electrodes hardly produce burrs during processing, reducing subsequent cleaning work.
Easy to process and polish: The cutting resistance of graphite is only 1/5 of that of copper, making manual grinding and polishing easier. At the same time, graphite electrodes are easy to trim and are particularly suitable for occasions that require high-precision processing.
Low cost: In recent years, the price of copper materials has continued to rise. In comparison, the price of graphite electrodes is more stable and low, usually 30%~60% lower than that of copper electrodes.
Anti-oxidation performance: The new anti-oxidation graphite electrode can effectively prevent surface oxidation within 1500℃, reduce consumption, and increase service life by 26%~60%.
High precision and high efficiency: Graphite electrodes are widely used in high-precision and high-efficiency EDM, which improves processing performance and scope of use.