What are the advantages of Expandable Graphite?
1, the increasing complexity of the mold geometry and the diversification of product applications lead to the spark machine discharge accuracy requirements are getting higher and higher. The advantage of Expandable Graphite is that it is easier to process, has high removal rate of discharge, and has a small loss of graphite. Therefore, some group sparks machine customers abandon the copper electrode and switch to Expandable Graphite. In addition, some special shape of the electrode can not be made of copper, but the graphite is easier to shape, and the copper electrode is heavy, not suitable for processing large electrodes, these factors are caused by some group of sparks machine customers Expandable Graphite.
2, Expandable Graphite is easier to process, and the processing speed is significantly faster than the copper electrode. Such as the use of milling process processing graphite, the processing speed faster than other metal processing 2 to 3 times without the need for additional manual processing, and copper electrode will need manpower grinding. Similarly, if the use of high-speed graphite processing center manufacturing electrodes, the speed will be faster, more efficient, will not produce dust problems. In these processes, the choice of hardness of the appropriate tools and graphite can reduce the wear and tear of the tool and copper damage. If the milling time of the Expandable Graphite and the copper electrode is comparable, the graphite is 67% faster than the copper electrode. In general, the use of Expandable Graphite is 58% faster than the copper electrode. As a result, the processing time is drastically reduced, and the manufacturing cost is reduced.
3, Expandable Graphite and traditional copper electrode design is different. Many mold mills often have different reserves in roughing and finishing of copper electrodes, while expansive graphite uses almost the same amount of reserves, which reduces the number of CAD / CAM and machine processing, for this reason alone, It is sufficient to improve the accuracy of the mold cavity to a large extent. Of course, the mold factory by the copper electrode with Expandable Graphite, the first should be clear is how to use graphite materials and consider other related factors. Today, some of the group sparks machine customers with graphite electrode discharge processing, which eliminates the mold cavity polishing and chemical polishing process is still able to achieve the desired surface finish. Without increasing the time and polishing process, the copper electrode can not make such a workpiece. In addition, the graphite is divided into different grades, in the specific application of the use of the appropriate level of graphite and EDM parameters to achieve the desired processing results, if the use of Expandable Graphite sparks on the operator using the same parameters with the copper electrode , Then the result is certainly disappointing. If the material of the electrode is to be strictly controlled, the Expandable Graphite can be set to a non-loss state (less than 1% loss) during roughing, but the copper electrode is not used.