Advantages of graphite electrodes
(1) The increasing complexity of mold geometries and the diversification of product applications have led to higher and higher requirements for the discharge accuracy of spark machines. The advantages of graphite electrodes are easier processing, high EDM removal rate, and low graphite loss. Therefore, some group-based spark machine customers have abandoned copper electrodes and switched to graphite electrodes. In addition, some special-shaped electrodes cannot be made of copper, but graphite is easier to mold, and copper electrodes are heavier and are not suitable for processing large electrodes. These factors have caused some group-based spark machine customers to use graphite electrodes.
(2) Graphite electrodes are easier to process, and the processing speed is significantly faster than copper electrodes. For example, milling graphite is used to process graphite, its processing speed is 2 to 3 times faster than other metal processing and no additional manual processing is required, while copper electrodes need to be frustrated by hand. Similarly, if a high-speed graphite machining center is used to manufacture the electrode, the speed will be faster, the efficiency will be higher, and the problem of dust will not occur. In these processes, the selection of tools and graphite with appropriate hardness can reduce the wear of the tools and the damage of the copper electrodes. If the milling time of the graphite electrode and the copper electrode is specifically compared, the graphite electrode is 67% faster than the copper electrode. In general, the discharge processing using the graphite electrode is 58% faster than using the copper electrode. In this way, the processing time is greatly reduced, and the manufacturing cost is also reduced.
(3) The design of graphite electrodes is different from traditional copper electrodes. Many mold makers usually have different reserves for roughing and finishing of copper electrodes, while graphite electrodes use almost the same reserves, which reduces the number of CAD / CAM and machining processes. For this reason alone, It is enough to greatly improve the accuracy of the mold cavity.