How to use graphite materials and other relevant factors to consider is, of course, die by the copper electrode conversion of graphite electrode. First of all, should be clear. Today part of the spark machine customers using graphite electrode discharge machining, which eliminates the mold cavity polishing and chemical polishing process can still achieve the desired surface finish. Without increasing the time and polishing process, the copper electrode can not produce such a workpiece. In addition, graphite is divided into different levels, in a specific application using the appropriate levels of graphite and electric spark discharge parameters to achieve the ideal processing effect, if the graphite electrode spark machine uses the operating personnel and the copper electrode of the same parameters, then the result would is disappointing. If you want to strictly control the electrode material, the graphite electrode can be used in the rough machining non loss state (loss of less than 1%), but the copper electrode is not used.
1. The increasing complexity of the mold geometry and the diversification of product applications require more and more high discharge accuracy of the EDM machine. The graphite electrode has the advantages of easy processing, high removal rate and low loss of graphite. Therefore, some of the spark machine customers have abandoned the copper electrode and switched to the graphite electrode. Also some special shape electrode cannot be made of copper, but graphite is easy molding and copper electrode is heavy, not suitable for the processing of large electrode, these factors caused part of the spark client application of graphite electrode.
2.Graphite electrode is easy to process, and the processing speed is significantly faster than the copper electrode. For example, the use of the milling process of graphite, the processing speed is 2 ~ 3 times faster than other metal processing, and no additional manual processing, and copper electrodes need to be put on the ground. Similarly, if the use of high speed graphite machining center manufacturing electrode, the speed will be faster, more efficient, it will not produce dust. In these processes, the selection of suitable tools and graphite can reduce the wear and tear of the cutting tool. If more specific milling time of the graphite electrode and the copper electrode and graphite electrode, graphite compared to copper electrode fast 67%, in general electrical discharge machining by graphite electrode machining than the copper electrode fast 58%. As a result, the processing time is greatly reduced, but also reduces manufacturing costs.
3.The graphite electrode and the traditional copper electrode design. Many die companies usually in copper electrode of rough machining and finish machining have different amount of reserve, and graphite electrode is used almost the same amount of reserved. This reduces the number of CAD / CAM and machine processing, for this reason alone is sufficient to improve the accuracy of the mold cavity in a large extent.