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Ultra-high power graphite electrode:
Graphite electrodes is mainly made of petroleum coke and needle coke as refractory raw materials, and coal tar pitch as a binder, which is prepared by calcining, compounding, kneading, pressing, calcining, graphitizing and machining and is released in an electric arc furnace Electrical energy on the charge heating and melting of the conductor.
Ultra-high-power graphite electrode are graphite electrodes that allow current densities greater than 25 A / cm2 and are mainly used in ultra-high-power steelmaking electric arc furnaces.
HP Graphite electrode advantages:
(1) Processing speed is faster: Under normal circumstances, graphite machining speed can be 2 to 5 times faster than copper; and discharge processing speed is 2 to 3 times faster than copper;
(2) The material is more difficult to deform: obvious advantages in the thin-walled electrode processing.
(3) lighter weight: the density of graphite is only 1/5 of copper, large electrode for electrical discharge machining, can effectively reduce the machine tool (EDM) burden; more suitable for large mold applications.
According to the use of different power and current, using different refractory raw materials and production technology, can be divided into ordinary power graphite electrodes, high power graphite electrodes, ultra-high power graphite electrodes. Graphite electrode has good electrical properties and chemical stability, high mechanical strength at high temperature, low impurity content, good vibration resistance, is a good conductor of heat and electricity.
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Graphite electrodes are widely used in steel-making electric arc furnaces, refining furnaces, ferroalloy production, industrial silicon, yellow phosphorus, corundum and other submerged arc furnaces and other arc furnaces that produce high temperatures.
HP Graphite electrode has good electrical properties and chemical stability, high mechanical strength at high temperatures, less impurities, good vibration resistance. It is a good conductor of heat and electricity.
Article Source: HP Graphite Electrode
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Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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When it comes time to decide whether to use graphite or copper electrodes in your shop, it&#;s important to look at the big picture. One has to consider application for which EDM is going to be used, depending on which a type of electrode can be chosen.
Earlier, Copper was the only option available, however with more availability of Graphite and its grades, use of Graphite for electrodes has increased substantially in last few years.
In this blog, we going to take a look at advantages and disadvantages of both which will help you decide which is the best fit for your needs.
Graphite comes with lot of advantages. Sold by the grade, machining graphite is very easy. It can be cut, drilled, grind, to whatever size and shape we need. Graphite can drill cut up to three times faster than copper and provides excellent surface finishes.
Another huge advantage of graphite is no burrs are produced in its machining. The graphite material can be machined on a high-speed mill and its easier to cut out complex shapes and forms. Most importantly, once the material is cut, no post processing is required.
Graphite has very high melting point which results in less wear. Moulds could be cut with one or two electrodes on a CNC EDM machine with very little wear.
If your EDM is old than you might at times find graphite dust particle on the floor or near by machines. However, the newer high speed machines do not face this problem. Another important point is the finish on the graphite should be as good as you need in the mould. If there are to many wear marks on graphite than they tend to get reproduced on the mould.
The biggest advantage of copper is mirror like surface finish. However, this requires the copper to be machined using CNC Machine with the right setting and perfect flushing techniques. This is especially useful in smaller cavities or the one with complex geometrical shapes that are relatively difficult to polish.
Also, Copper tends to work better for EDM machining even if the flushing system is poor. If an eroded part is not flushed it may be possible to get a non-pulsating, direct flow of current from the electrode to the work piece, With copper electrodes such instances are arrested.
Copper is a hard metal, as compared to graphite. Copper also has very low heating point. With quick heating copper electrodes develop a tendency to stick or melt. Another disadvantage, as compared to graphite electrodes is creation of burr. No matter what precautions you take, copper electrodes in most instances will need to undergo a deburring process.
Copper and graphite electrodes come with their own set of advantages and limitations. The decision to choose the right kind of electrode must be taken only after a careful consideration of speed and finishing requirements to machine the material safely.
For more information, please visit Male Female Graphite Electrode.