The main raw material of graphite electrode production is petroleum coke, ordinary power graphite electrode can add a small amount of asphalt coke, the sulfur content of petroleum coke and asphalt coke can not exceed 0.5%. The production of high power or ultra high power graphite electrodes also need to add needle coke. The main raw material of aluminum anode production is petroleum coke, and the sulfur content is controlled not more than 1.5% ~ 2%, petroleum coke and asphalt coke should meet the relevant national quality standards
Advantages of graphite electrode
(1) The increasing complexity of mold geometry and the diversification of product applications lead to higher and higher requirements for discharge accuracy of spark machine. Graphite electrode has the advantages of easy processing, high discharge machining removal rate and small graphite loss. Therefore, some customers of group-based spark machine give up copper electrode and use graphite electrode. In addition, some special shape electrodes can not be made with copper, but graphite is easier to form, and copper electrode is heavy, not suitable for processing large electrodes, these factors cause part of the group spark machine customer application of graphite electrode.
(2) Graphite electrode is easier to process, and the processing speed is significantly faster than that of copper electrode. For example, using milling process to process graphite, its processing speed is 2 to 3 times faster than other metal processing and does not require additional manual processing, while copper electrode needs manual grinding. Similarly, electrodes can be manufactured faster and more efficiently with a high speed graphite machining center, without dust problems. In these processes, the choice of suitable hardness tools and graphite can reduce tool wear losses and copper electrode damage. If the specific comparison of graphite electrode and copper electrode milling time, graphite electrode is 67% faster than copper electrode, in general discharge processing, the processing of graphite electrode is 58% faster than that of copper electrode. In this way, the processing time is greatly reduced, and the manufacturing cost is also reduced.
(3) The design of graphite electrode is different from that of traditional copper electrode. Many die factories usually have different reservations for roughing and finishing copper electrodes, while graphite electrodes use almost the same amount of reservations, which reduces the number of CAD/CAM and machine machining times. For this reason alone, it is enough to greatly improve the accuracy of die cavities.