Graphite - black power of EDM Technology Publisher: Haina Baichuan time: 2006-06-27 10:55:32 graphite - black power of EDM technology sigli carbon, as an industrial technology widely used in the mold field, EDM has always played an important role. In order to maintain the high quality of the mold, the importance of the electrode is a topic that has been discussed for a long time. While energy conservation has become a hot topic today, more and more customers have to realize the new trend of some technological changes while using traditional copper electrodes for EDM: how can we use limited resources to improve output value? How can we save time, cost and energy under the same conditions?

The change of materials is an effective solution. Graphite, a black power with great potential, is gradually becoming the future trend of electrode materials for EDM due to its special stable physical characteristics.


Why can graphite electrode replace copper electrode and accomplish its mission excellently?


First, the increasing complexity of mold geometry and the diversification of related product applications lead to higher and higher requirements for the machining and discharge accuracy of EDM electrodes. The advantage of graphite electrode is that it is easy to process, high removal rate of EDM and small graphite loss. Therefore, more and more mold factories give up copper electrode and use graphite electrode instead. In addition, some special shaped electrodes can not be made of copper, but graphite is easier to form, and the copper electrode is heavy, which is not suitable for processing large electrodes. These factors have accelerated the increasingly widespread application of graphite electrodes in the mold manufacturing industry.


Second, the graphite electrode is easier to process, and the processing speed is significantly faster than the copper electrode. For example, the milling process is used to process graphite, which is 2-3 times faster than other metal processing and does not require additional manual processing, while the copper electrode needs manual filing and grinding. Similarly, if the high-speed graphite machining center is used to manufacture electrodes, the speed will be faster and the efficiency will be higher, and the dust problem will not be generated. In these machining processes, selecting tools and graphite with appropriate hardness can reduce the wear loss of tools and the damage of electrodes. If the milling time of graphite electrode is specifically compared with that of copper electrode, the milling time of graphite electrode is 67% faster than that of copper electrode. In general electric discharge machining, the processing time of graphite electrode is 58% faster than that of copper electrode. In this way, the processing time is greatly reduced, and the manufacturing cost is also reduced.


Third, the design of graphite electrode is different from that of traditional copper electrode. Many mold factories usually have different reserves for rough machining and finishing of copper electrodes, while graphite electrodes use almost the same reserves, which reduces the number of CAD / CAM and machining. For this reason alone, it is enough to improve the accuracy of mold cavities to a large extent.


Of course, after the mold factory switches from copper electrode to graphite electrode, it should first be clear how to use graphite material and consider other relevant factors. Nowadays, most plastic molds use graphite for electrical discharge machining, which eliminates the process of mold cavity polishing and chemical polishing, but still achieves the desired surface finish. It is impossible for the copper electrode to produce such a workpiece without increasing the time and polishing process. In addition, graphite is divided into different grades, and the ideal machining effect can only be achieved by using the appropriate grade of graphite and the discharge parameters of the spark machine under a specific application program. If the operator uses the same parameters as the copper electrode on the spark machine using the graphite electrode, the results will certainly be disappointing. If the material of the electrode needs to be strictly controlled, the graphite electrode can be set in a non loss state (loss less than 1%) during rough machining, but the copper electrode is not used.


Summarized by keywords, graphite has the following high-quality characteristics that copper can't match:


-Processing speed: high speed milling rough processing is 3 times higher than copper block; High speed milling finishing is 5 times higher than copper block

-Good machinability and complex geometric modeling

-Light weight, less than 1 / 4 of copper density, easy clamping of electrode

-The number of individual electrodes can be reduced because they can be bundled into combined electrodes

-Good thermal stability, no deformation

-No machining burr


Therefore, at present, many mold factories are gradually converting to graphite electrode EDM processing in order to improve the competitiveness of enterprises and products in the market.


At present, the domestic graphite electrode market competition is fierce, the graphite material suppliers are mixed, and the product quality is uneven. If the enterprise fails to achieve the expected goal due to improper selection of graphite raw materials, the gain will outweigh the loss. As a leader in the industry and one of the world's largest suppliers of carbon and graphite materials and related products, SGL Carbon Group continued the rigorous and striving for excellence style of German enterprises. After entering China in 1997, it not only committed to providing customers in the field of EDM with different grades of high-quality isostatic pressure graphite for different applications in China; It also makes efforts for the market segmentation of China's graphite industry and the improvement of the overall product quality. Only carbon graphite products for EDM are available. Sigli's product line covers the following graphite grades:


RINGSDORFF? R 8340, an effective graphite electrode brand for rough electrical discharge machining

RINGSDORFF? R 8500, general graphite electrode brand for rough electrical discharge machining

RINGSDORFF? R 8510, loss resistant fine particle graphite electrode brand, application

In the growing mold field

RINGSDORFF? R 8650, graphite electrode brand for high precision and precision electrical discharge machining

number

RINGSDORFF? R 8710, graphite for high quality and ultra precision electrical discharge machining

Electrode brand, high removal rate of EDM


In addition, sigli carbon advocates to promote perfect professional services in the industry to help customers successfully complete the updating of electrode materials for EDM. Sigri special graphite (Shanghai) Co., Ltd., its wholly-owned subsidiary in China, has been committed to bringing Sigri's global expertise and service experience into China and better serving domestic customers with its rich experience through its domestic processing plant and professional sales team. ( http://www.newmaker.com ）(if you are the author of this article, please click here) (2006-6-27, read 8 times) to view more related articles: · industrial raw materials / other industrial raw materials

·Mold design and manufacturing / mold related equipment

·Machine tools and metal processing equipment / EDM / wire cutting

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