EDM with graphite electrode, also known as copper, in the mold manufacturing now has many areas, graphite cost advantage plays an important role in modern processing methods, including EDM graphite (isotropic isostatic graphite) in EDM is most widely used. My company after years of application in the field of EDM graphite operation, selection of several domestic and foreign high-quality carbon materials manufacturers as partners, to provide customers with excellent products of graphite electrode in EDM process in all kinds of bad, such as carbon, loss, surface is not up to the performance parameters of material and spark machine requirements and so on bad phenomenon and graphite itself has a direct connection, high quality graphite spark machine is not any brand of imported can achieve the desired effect, my company after years of research, according to the current market mainstream equipment to customers for graphite materials with the highest price, and a professional engineer to provide professional counseling can effectively reduce the cost of operating machine, help the mold manufacturing enterprises.

　　1: the increasing complexity of the mold geometry and the diversification of product applications lead to the increasing demand for the discharge accuracy of the EDM machine. Graphite electrode has the advantages of easy processing, high removal rate and low graphite loss. Therefore, the metal electrode is replaced by graphite electrode. In addition, some of the special shape of the electrode can not use copper production, but graphite are more easily formed, and the copper electrode is heavy, not suitable for processing large electrode, these factors have caused some qunji spark machine application of graphite electrode.

　　2: the graphite electrode is easier to process, and the processing speed is faster than the copper electrode. For example, the use of milling process graphite, its processing speed is faster than other metal processing 2 ~ 3 times and does not require additional manual processing, and the copper electrode is the need for hand grinding. Similarly, if the use of high-speed graphite processing center graphite electrode manufacturing electrode, the speed will be faster, more efficient, will not produce dust problems. In these processes, the choice of the right tools and graphite can reduce the wear and wear of copper and copper. If the graphite electrode and the copper electrode graphite electrode milling time is compared, the graphite is 67% faster than the copper electrode, in general, the processing of the graphite electrode is faster than that of the copper electrode by the use of the copper electrode, and the graphite electrode is more than 58%. In this way, the processing time is greatly reduced, and the manufacturing cost is reduced.

　　3: the graphite electrode is different from the traditional copper electrode. Many mold factory usually reserved in different copper electrode roughing and finishing, and the graphite electrode is used for almost the same, which reduces the number of CAD/CAM and the single machine, for this reason, to improve the accuracy of mold cavity to a great extent. Of course, mold factory made of copper electrode to the graphite electrode, first of all should be clear is how to use graphite materials and its consideration

　　His related factors. Today, some customers use graphite electrode discharge, which eliminates the mold cavity polishing and chemical polishing process is still able to achieve the desired surface finish. It is not possible to produce such a workpiece without increasing the time and polishing process. In addition, graphite is divided into different levels, using the appropriate level in the specific application of the graphite and EDM parameters to achieve the desired processing results, if the operators use the same parameter with copper electrode in EDM using graphite electrode, then the result would be disappointing. If the material of the electrode is strictly controlled, the graphite electrode can be arranged in a non loss state (less than 1%) when being processed, but the copper electrode is not used.

　　Graphite has the following copper incomparable quality characteristics:

　　* processing speed: high speed milling roughing 3 times faster than copper; high speed milling finishing copper faster than 5 times

　　* good machinability, can achieve complex geometric modeling

　　* light weight, density less than 1/4 of copper, easy to hold electrode

　　* can reduce the number of individual electrodes, because can be bundled into a combination electrode

　　* good thermal stability, no deformation, no burr.

　　application field

　　Carbon and graphite products are widely used in various fields of machinery, electronics, semiconductor, silicon, metallurgy, petroleum, chemical, textile, electrical appliances, motor, electric, transportation, communications, aviation, atomic energy, medicine, food, biological engineering, in order to give full play to the characteristics and potential of our company has been positive for customers in different fields provide technical support and service.

　　Mold in the home appliances, automotive, electrical, aerospace and other industrial areas has increasingly become the main process of industrial production, the main process equipment, and bear the 60%-90% of these industries in the production of parts and components of the processing. In recent years, high speed milling has broken through the limitation of traditional milling hard, high strength and high toughness die materials. But electric discharge machining with high machining accuracy and surface quality, wide processing range, especially in high speed milling can match in the advantage of joints, high hard materials of the mould cavity machining of complex and precise, thin-walled, narrow, so in electrical discharge machining (EDM) will still be the main means of the mold cavity processing. Because the graphite electrode (compared with copper) electrode consumption less, electrical discharge machining speed, good machining performance, light weight, heat expansion coefficient and other advantages, and gradually replace the copper electrode to become the mainstream of the EDM electrode. Compared with copper, graphite electrode has the advantages of less consumption, high discharge speed, light weight and small thermal expansion coefficient. Therefore, it is the main. In contrast, graphite electrode material has the following advantages:

　　Speed: Graphite discharge faster than copper 2-3 times, the material is not easy to deform, in the processing of thin reinforced electrode have obvious advantages, copper softening point in 1000, easily due to thermal deformation and graphite sublimation temperature is about 36.5 degrees, compared with, graphite material thermal expansion coefficient only copper 1 / 30.

　　Light weight: the density of graphite is only copper 1/5, large electrode discharge machining, can effectively reduce the burden of machine tool (EDM), more suitable for large-scale mold application;

　　Low loss: due to the spark oil containing C atoms, in the discharge process, the high temperature led to the C atoms in the spark oil is broken down, and the surface of the graphite electrode to form a protective film, the loss of the graphite electrode;

　　No burr: copper electrode in the end of the process, it is necessary to manually remove the burr, and graphite processing without burr, which not only saves a lot of cost and manpower, but also easier to achieve automated production;

　　Easily Polished : because of the cutting resistance of graphite copper is only 1/5, more easily by hand grinding and polishing operation;

　　Low cost: as a result of rising copper prices in recent years, now, the price of the isotropic graphite is lower than that of copper; under the same volume of graphite products price than copper low 30 to 60 percent, relatively stable prices, short-term price fluctuations relatively speaking, is relatively small.

　　Graphite mould processing technology

　　First it from mold design personnel according to the requirements of the use of products (parts), the mold structure design, plotted drawings again by skilled workers according to the requirements of the drawings by a variety of mechanical processing (such as a lathe, planer, milling machine, grinder, EDM, wire cutting and other equipment) do a good job in each part of the die, then assembled debugging until they were able to produce qualified products.

　　Present situation and development of graphite mould

　　Now graphite mould industry of human living and development plays a vital role, many industrial departments, such as Electromechanical, automobile, light industry, home appliances, electrical appliances, communication, ordnance, the development of dependence in Die & mold industry technology improvement and development, all countries in the world have invested large amount of human and financial resources to develop the graphite mold industry. Like Germany, Japan Toyo SGL in the international carbon graphite mould industry has played a leading role. The development of mold industry in our country has attached great importance to, level of mold production technology level has become the measure of a national product manufacture level of an important symbol of, because the mold in a large extent determines the product quality, efficiency and new product development capability. From 1997 in our country, the relevant departments began to pay attention to and support the development of graphite mold industry, vigorously support the graphite mold industry in the development of local enterprises in China, has now made good achievements, and made contribution to China's export earnings. For the future development of the mold industry trends, who can in the shortest time to complete the production of mold, who won the customer, to win the market. Graphite mold (graphite electrode) with its superior performance in various aspects, has established an important leading position in the mold industry and the future development trend.

　　In twenty Century, copper was widely used as electrode material in EDM. At that time, only in the production of large electrodes and mold processing requirements are not high or rough machining, graphite materials will become an alternative. Some of the early contact with the graphite electrode of the technical staff have a general impression: the graphite material is dirty, surface effect is not good, the processing efficiency is not high, etc.. With the development of high and new technology, and constantly improve the manufacturing process of graphite material, can satisfy different EDM demand of graphite materials emerge in an endless stream, market graphite for high speed milling machine tool arises at the historic moment, numerical control electric spark machine tool graphite discharge performance also promotes in the round. Nowadays, in the manufacturing technology leader in Europe, more than 90% of the electrode materials by graphite mould enterprises. Aerospace, automotive, home appliances and electronic mould has been widely using graphite as the electrode material, the significant

　　Due to the change of the graphite electrode has many advantages such as high efficiency and high quality processing.

　　Graphite is a kind of non metallic materials, the melting point is very high, up to 3650 degrees Celsius, and the melting point of copper is 1083 degrees Celsius, so the graphite electrode can withstand greater current setting conditions. When the discharge area and the size of the electrode is larger, the advantage of high efficiency and rough machining of the graphite material is more significant. The thermal conductivity of graphite is 1/3, the heat energy produced during the discharge process can be more effective in the removal of metal materials, and therefore, in the finishing process, the machining efficiency is higher than that of the copper electrode.

　　Electrical discharge machining (EDM) with the advantages of graphite and copper electrode than graphite electrode, the proportion of graphite is 1/5 of the copper, the weight of the same volume of graphite copper relatively light for 5 times. Easy to manufacture large mould; Graphite processing speed, generally 3 ~ 5 times faster than ordinary metals, can reduce the tool wear and the electrode loss; Graphite high melting point and easy not deformation, don't have to worry about because of high processing through deformation and damage of components; Graphite in processing after the completion of the polishing processing generally don't have to. To reduce the error and shorten the production cycle. Graphite electric cremation processing speed and low dissipation factor, as long as well with reasonable processing parameters, the zero loss on the graphite electrode can be theoretical, reduce the number of repeated electrode processing.

　　Because of graphite material is copper material has the advantage, at present, many mold factory are converted into graphite processing, so as to shorten the delivery time of products to enhance competitiveness in the market. Europe's current electricity cremation processing with the ratio of graphite and copper, lo and the Chinese market is 3:7, along with the rise in copper prices and technological progress, the proportion of using graphite will continue to rise, therefore, our country of graphite used for edm great development space. During the period of "15" mold market demand is very prosperous, foreground is very good, Beijing Greatwall Co.,Ltd. will provide better products and services. In the current mould has become a bottleneck of many industry development situation, such as to better meet the needed for the development of national economic sectors, "15" during the mold output each year, about 15% of the growth, upgrading the machinery manufacturing equipment and manufacturing technology level enhancement, to precision mold development, develop in the direction of large, complex, long-life, multi-functional composite die will further development, therefore, request graphite material in "specifications on large-scale, granularity composition, ultrafine particles using on flexural capacity strengthened".