The increasing complexity of the mold geometry and the diversification of product applications have led to higher and higher requirements for the discharge accuracy of the spark machine. The advantages of graphite electrodes are easier processing, a high EDM removal rate, and low graphite loss. Therefore, some customers who use the group-based spark machine abandon the copper electrode and switch to the graphite electrode. In addition, some special-shaped electrodes cannot be made of copper, but graphite is easier to mold. In addition, copper electrodes are heavy and are not suitable for processing large electrodes. These factors have caused some customers who use spark machines to use graphite electrodes.
There are two types of graphite electrodes: graphite electrodes and copper electrodes. 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 is 2 to 3 times faster than other metal processing and does not require additional manual processing, while copper electrodes require manual frustration. If a high-speed graphite machining center is used to manufacture electrodes, the process will be faster and the efficiency will be higher, and there will be no troubles of dust. In these processes, choosing tools with appropriate hardness and graphite can reduce tool wear and copper electrode damage. If you specifically compare the milling time of graphite electrodes and copper electrodes, you will find that the graphite electrode is 67% faster than the copper electrode. In general electrical discharge machining, machining with graphite electrodes is 58% faster than copper electrodes. In this way, the processing time and the manufacturing cost will reduce.
The design of the graphite electrode is different from that of the traditional copper electrode. Many mold factories usually have different allowances for roughing and finishing of copper electrodes, while graphite electrodes use almost the same allowances. That will reduce the number of CAD/CAM and machine processing, which is enough to improve the accuracy of the mold cavity to a large extent.