The artificial graphite electrode uses the high quality petroleum coke, the needle coke, the coal pitch and so on the low ash raw material, after calcination, the batching, the kneading, the molding, the roasting and the pressure impregnation after the 2500 degree above the high temperature graphitization, by mechanical processing, it is a conductor which is heated and melted by electric arc-releasing electric energy in EAF, which is widely used in steelmaking, yellow phosphorus, industrial silicon and other alloys and non-metallic materials. With low resistivity, good conductivity, low ash content, compact structure, good oxidation resistance and high mechanical strength.
Graphite electrodes are widely used, but how to use, to really improve efficiency, reduce costs, improve market competitiveness, these problems are not only the graphite electrode manufacturers to consider the problem, but also the use of graphite electrodes should be treated with caution.
First, dust: Because graphite is a fine particle structure, in the mechanical processing, will produce a lot of dust, has a great impact on the plant environment; In addition, the impact of dust on equipment mainly reflected in the power of the equipment, because the graphite conductivity is very good, into the power box, easy to cause the power supply short-circuit and other faults; However, because of the large investment cost of graphite special processing equipment, many enterprises are more cautious in this respect. In this case, you can take the following solutions:
1 Graphite Electrode External association: With the application of graphite in the mold industry is becoming more and more extensive, more and more mold foundry (OEM) enterprises have also imported graphite electrodes foundry business.
2 oil after processing: after the purchase of graphite, first immersed in the spark oil for a period of time (specifically according to the volume of graphite to judge), and then in the processing center in the processing, so that the graphite dust will not fly, but down. This will minimize the impact on equipment and the environment.
3 Conversion Processing Center: The so-called conversion, mainly in the ordinary processing center to install vacuum cleaners.
Second, mechanical processing of the collapse angle: Because graphite is more brittle than copper, if the processing of copper electrodes to process graphite, it is easy to cause the electrode collapse angle, especially in the processing of thin-ribs electrode.
Third, discharge processing of the discharge gap: unlike copper, because the graphite electrode discharge speed faster, the unit time corrosion out more processing slag, how to effectively discharge slag become a problem; Therefore, the demand for discharge clearance is larger than copper. In general, when the discharge gap is set, the discharge clearance of graphite is larger than that of copper $number.
Four, correct understanding its insufficiency: besides the dust, the graphite still has some insufficiencies. For example, in the processing of mirror mold, compared to the copper electrode, graphite electrode is not easy to achieve the desired effect, and to achieve a better surface effect, it is necessary to select the most fine particles of graphite, and the cost of this graphite is often higher than the general graphite to $number times. In addition, graphite has a low reuse, because of the relationship between the production process, only a few graphite electrodes can be used for reproduction and utilization. After EDM, the discarded graphite can not be used for a while, so the environmental management of the enterprise will bring some test.