Graphite electrode, mainly made of petroleum coke and needle coke, coal tar pitch as binder, is prepared by calcination, compounding, kneading, pressing, roasting, graphitization and machining, and is released in the form of electric arc in electric arc furnace. The conductor that heats and melts the charge of the electric charge can be classified into ordinary power, high power and ultra high power according to its quality index.
In the steel making process, graphite electrodes have the following advantages:
1: The increasing complexity of mold geometries and the diversification of product applications have led to higher and higher discharge accuracy requirements for spark machines. The advantages of the graphite electrode are that the processing is easier, the discharge processing rate is high, and the graphite loss is small. Therefore, some group-based spark machine customers give up the copper electrode and switch to the graphite electrode. In addition, some special shaped electrodes can not be made of copper, but graphite is easier to form, and the copper electrode is heavier and not suitable for processing large electrodes. These factors have caused some group-based spark machine customers to apply graphite electrodes.
2: Graphite electrodes are easier to process, and the processing speed is significantly faster than copper electrodes. For example, the use of milling technology 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 electrodes need to be frustrated by human hands. Similarly, if a high-speed graphite machining center is used to make the electrode, the speed will be faster, the efficiency will be higher, and no dust problem will occur. In these processes, selecting the right hardness tool and graphite can reduce the tool wear loss and copper breakage. If the milling time of the graphite electrode and the copper electrode graphite electrode is specifically compared, the graphite is 67% faster than the copper electrode. In the general case of electrical discharge machining, the processing using the graphite electrode is 58% faster than the copper electrode. As a result, the processing time is greatly reduced, and the manufacturing cost is also reduced.
3: Graphite electrodes are different from conventional copper electrodes. Many mold shops usually have different reserves for roughing and finishing of copper electrodes, while graphite electrodes use almost the same amount of reservation, which reduces the number of CAD/CAM and machining times. For this reason alone, Sufficient to improve the accuracy of the mold cavity to a large extent.
