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.

　　What is graphite products? What are the characteristics of graphite products? What graphite products can be made from ordinary graphite? let me tell you one by one.

　　Graphite products are made of synthetic graphite and natural graphite according to the properties of the graphite.

　　The characteristics of graphite products have are as following:

　　1).Graphite products have excellent adsorption. The open space structure of carbon has excellent adsorption, so carbon is often used as adsorption material for the adsorption of water, odor, toxic substances, etc..

　　2).Graphite products have excellent thermal conductivity, fast heat transfer, uniform heating, fuel saving.

　　3).Graphite products have the abilities of chemical stability and corrosion resistance. Graphite has excellent chemical stability at room temperature, without any corrosion of acid, alkali and organic solvent. Thus, even if the long-term use of graphite products and its wastage is very small.

　　4).Graphite products with anti oxidation effect and strong reduction effect.

　　5).Graphite products are environmental protection, no radioactive pollution, high temperature resistance.

　　Ordinary graphite products can be produced by ordinary graphite :

　　1).Conductive material: Graphite in the electrical industry are widely used to electrode, carbon brush, carbon rod, carbon tubes, mercury rectifier cathode and graphite gaskets, telephone parts, the coating of TV picture tube and so on.

　　2).Wear-resistant and lubrication materials: graphite is often used as a lubricant in the machinery industry. Many equipment for conveying corrosive medium, the widespread adoption of graphite materials made of piston ring, the sealing ring and the bearing, they do not need to add lubricating oil when they are running, aquadag graphite is the good lubricant for metal processing .

　　3).The corrosion resistant material: graphite has good chemical stability. It has corrosion resistance, good thermal conductivity and low permeability characteristics after special processing of graphite, so it is widely used in production of heat exchanger, reaction tank, condenser, combustion tower, absorption tower, cooler, heater, filter and pump equipment.

　　4).Casting, foundry, pressure die and high-temperature metallurgy material: due to the small expansion coefficient of the graphite and the capability of rapid cooling and rapid heating changes. The moulding die and boat made of graphite materials are usually used to product the hard alloy and other powder metallurgy process. Crucible for silicon crystal growth, zone refining vessel, bracket, fixture and induction heater etc.. In addition, graphite can also be used for vacuum smelting as graphite heat insulation board and base, high temperature resistance furnace tube, rod, plate, grid and other components.

　　5).The anti fouling material: graphite can prevent fouling in the boiler, and the unit test indicates that the amount of graphite powder (about 59 a ton of water) is added to the water to prevent fouling on the boiler surface. In addition, graphite is coated on metal chimney, roof, bridge, pipeline can be anti-corrosion and rust.

The graphite electrode has the advantages of easy processing, high metal removal rate in EDM, as well as a small loss of graphite. Therefore, more and more mold factory abandon the use of copper electrode and choose graphite electrode. So, what are the advantages of graphite?
1).The proportion of graphite is copper 1/5, the weight of the same volume of graphite is 5 times lighter than that of copper. the large electrodes made from copper are too heavy, in the long running, it is very unfavorable to the accuracy of the machine tool spindle on the EDM. But graphite is opposite and in safe handling!
2).The graphite can have a very high processing speed, the general speed of the processing of graphite is 3-5 times faster than the ordinary metal. And it can reduce tool wear and electrode loss when we choose suitable hardness tool and graphite,.
3).The graphite is easy to shape and will not be deformed, and some of the shape of the electrode with copper is not easy to make and can be easily achieved with graphite. Such as thin slice electrode, the copper deformed easily in machine processing and EDM. But graphite can easily reach and graphite in EDM can with larger current and processing speed, we don't worry about that deformation because of the high temperature and the workpiece is damaged.
4).The finishing and polishing of graphite, in general, the graphite after the processing do not need to be polished. It also reduces the precision error of the graphite electrode after forming and shortens the production cycle.
5).The EDM speed of graphite is quick and losss is mall because the melting point of copper is 1083 degrees Celsius, while the temperature of EDM at 1100 C, the copper electrode in the EDM is relatively easy to consume and wear. And the graphite in 3550 degrees will appear sublimation, as long as the proper processing parameters, graphite electrode can achieve the theoretical significance of the zero loss. So as to avoid the number of electrode processing.
6).In the design and programming of electrode, graphite electrode design is also different. Many mold factory usually reserved in different copper electrode roughing and finishing, and the graphite electrode can be used for the same amount, which reduces the number of workload and machine CAD/CAM. For this reason alone is enough to reduce the mold design and processing cycle, but also reduce the probability of error processing.

　　　Graphite self sealing ring consists of low sulfur expandable graphite by moulding, precise size, density can be determined, and without any additional filler or adhesive. Graphite purity greater than 98%, do not need to carry out anti-corrosion treatment. Generally, the cross section of the packing ring is square, and it can also be wedge shaped or V shaped, and the two parts can be used for high pressure.

　　Graphite self sealing ring consists of low sulfur expandable graphite by moulding , precise size, density can be determined, and without any additional filler or adhesive. Graphite purity greater than 98%, do not need to carry out anti-corrosion treatment. Generally, the cross section of the packing ring is square, and it can also be wedge shaped or V shaped, and the two parts can be used for high pressure.

　　Enhanced graphite self sealing ring

　　Molded from pure flexible graphite, lined with metal, stainless steel foil, mesh, or other materials.

　　Application

　　With the characteristics of expanded graphite, can withstand severe alternating temperature and pressure, is the valve and all kinds of static sealing ideal filler. In addition to the stems are severely damaged avoid use. It can used alone, but also with JJ-771 high carbon fiber packing end ring used in combination, can prevent filler extruding.

　　Although the definition of isotropic graphite in the world needs to be further defined, it is generally to measure some physical properties of the product's diameter and length. The ratio of the thermal expansion coefficient is expressed as the ratio of the resistivity. The large scale graphite diameter of the advanced countries and other industrial technology has reached 1.5 m, the length is 3%, the bulk density is g/cm 1.95-2.0, the anisotropy ratio is reduced to 1.05. In addition to the use of ordinary petroleum coke, the use of modified asphalt, tar, coke, oxidized petroleum coke, petroleum coke, natural graphite, etc..

　　And other static pressure graphite by high pure graphite pressed. Static pressure graphite is a new product developed in the last 50 years, which is closely related with the modern technology. Do not only in the civil field, occupies an important position in the national defense, is a new type of material, attract people's attention. It is the production of single crystal furnace, metal continuous casting graphite mold, electric spark machining with graphite and other non alternative materials, but also the production of rocket nozzle, graphite reactor of the material and the material of the reflection material.

　　The foundry industry in the machinery industry uses graphite material as the pressure casting, centrifugal casting, super hard alloy hot extrusion and other processing of the mold, big to the train wheel, small to precision parts can be used graphite mold. Graphite mold can be used repeatedly, after the release of the casting has a high degree of finish, some without further processing can be used. Graphite materials used in the casting mold should be of high quality, low thermal expansion coefficient and good oxidation resistance. Graphite can be used in the casting of large size. China for the manufacture of a large number of graphite mold, in 2005, the continuous casting of graphite about 1500t, the use of graphite in the production of 4000t.

　　In the mould graphite metal continuous casting graphite quality requirements of the most stringent requirements for its high thermal conductivity, thermal stability and thermal shock resistance, good lubrication, and molten metal infiltration, not with the cast metal reaction, easy to process into the size of the mold. The characteristics of continuous casting graphite are as follows: bulk density 1.7-1.9g/cm, flexural strength 30-40MPa, tensile strength 20-30MPa, thermal conductivity 100 W/ (K - M).

　　X mm 280 X MM 200 mm 1260 mm 240 mm 1000 X mm 70 X casting speed according to the size of the cast plate 0.7 m/min ~4. Fine structure graphite or other static pressure forming graphite can be processed into metal continuous casting graphite pieces.

　　Forging graphite emulsion (forging demoulding agent) is a compounded with graphite and other polymer materials of water-based release agent, is black, non-ferrous metal hot and cold working mould release lubricant. Forged sub micron graphite emulsion is a high-end products in the forging of graphite, metal precision forging, when its very fine graphite particles attached to the surface of the mold, can form a layer of thin film solid adhesion on metal mold surface, this film has excellent lubrication, high temperature resistance.

　　The product is mainly used for forging forging, metal mold machining, heat extrusion processing (such as aluminum, copper and other non-ferrous metals), molten steel casting, pure silicon smelting and other fields.

　　Main ingredients

　　Graphite, inorganic film forming material, organic water soluble polymer (which has the function of protecting and dispersing the colloid), and the water, etc.. The specific formulation and production technology vary with the application field.

　　Environmental protection

　　In the course of the use of water, there is no harmful gas emissions in the process of the use of graphite milk.

　　Using method

　　1 、The use of the first should be a mix of forged graphite milk. After a long period of time, there may be a small amount of solid material precipitation, but after mixing can restore the original suspension uniform state, without reducing the use of results.

　　2、 Users can according to different requirements or experience, decided on whether liquid dilution and dilution ratio, the following reference;

　　(1) The shape of the forging is complex and difficult to release, in which a large and small dilution 3-5 times; medium and small water diluted 5-10 times;

　　(2) General forging and forging water 5-15 times;

　　(3) Roll forging process can be diluted 20-30 times;

　　(4) The requirements for special processes may not be diluted and used directly

　　Special graphite covers a wide range, the Chinese electrical carbon products industry, natural graphite products industry and metallurgy with carbon products industry in this regard have different understanding and classification methods, metallurgical carbon products industry classification of habits explain, special graphite mainly refers to the high strength, high density, high purity graphite products (referred to as Sangao graphite). Sangao graphite from the organization of the material can be divided into coarse grain structure, fine grain structure and fine grain structure, from forming method of distinguish main molding special graphite, extrusion molding special graphite and static pressure molding special graphite three categories. In addition, vibration molding can also be used for the production of special graphite. High quality specialty graphite, an isotropic graphite, is a special kind of graphite used in static pressure.

　　Not all special graphite must achieve the same high density, high strength, high purity index, using in different occasions of special graphite with strength and the density of specific requirements, strength, density index is not the same. Many special graphite does not need to reach high purity, ash is not the main quality index. Some special graphite does not require high strength, high density but need high purity. Some special graphite such as electric spark machining graphite according to different processing technology and processing object need different physical and chemical index of fine particles of graphite or special fine particles structure graphite.

      As the top graphite manufacturer of China,We have widely ranged of graphite products production capacity,includes wide range of carbon and graphite products.Graphite and carbon carbon composites products if you have needs, we are dedicated to providing high-quality products and services.

Graphite color steel from iron ash to ash, black streaks, has significant heterogeneity, optical inhomogeneity, hardness and opaque, with metallic luster, aphanitic qualitative is bleak. 1 ~ 2 hardness, specific gravity 2.09 ~ 2.23, inferior graphite proportion is 1.84 ~ 1.98. (the proportion of change is decided by the amount of bubbles and). Chip can bend, soapy, paper and fingers to pollution. Graphite heat resistant (higher than copper and aluminum), with high electrical conductivity, which can withstand temperatures up to 3000 ℃, melting point 3800 ℃, boiling point 4250 ℃, plastic, chemical stability strong, insoluble in acid and alkali.

　　Use and applications

　　(1) the manufacture electric smelting furnace, electrolytic cell, the arc lamp and arc welding electrodes and generator, motor carbon brush, resistor and phone machine, etc.

　　(2) manufacturing various metallurgical crucible.

　　(3) the graphite is able to absorb a large number of neutrons, so can be used as a moderator in the atomic reactor, but it must be highly pure crystalline graphite.

　　(4) used for foundry mold surface coating, antirust paint, machine lubricant, bearing lubricant.

　　(5) a mixture of all kinds of refractories and refractory insulation materials.

　　(6) manufacturing KangFuXing paint.

　　(7) manufacturing pencil lead, as the black color material.

　　(8) by special chemical treatment, can make the flexible sealing material.

　　As refractory materials ,Including the refractory，Crucible for,Continuous casting powder,The mold core,Mold detergents and high temperature resistant material.nearly20 over the years,refractory Industry is the two important changes in magnesia carbon brick is widely used in steel furnace lining,Aluminum and carbon brick should be in continuous casting with.The graphite refractory material and steel industry is closely linked,The world steel industry consumes around70%，The refractory 60 The mid -,Developed by the United States;70s,The Japanese steel industry began to make magnesia carbon brick.Used for water cooling in the arc furnace steelmaking.At present, the worldwide magnesia carbon brick has a large number of used in steelmaking,And has become a kind of graphiteSystem USES 80.s,Magnesia carbon brick for oxygen top-blown converter lining began.The UK used of basic oxygen steelmaking furnace lining,Materials are mostly magnesium carbon brick,Lining life is 1000.At a time1500,While Japan,The service life of furnace lining2000,At a time2500Times.

　　Aluminum carbon brick carbon refractory material is mainly used in continuous casting,Flat steel billet from a shield of pipeline,Submerged nozzle, and the well Cartridge etc..With continuous casting of steel production in Japan of total production90%/The above,In the UK for 60%.Made of graphite crucible and relevant products forming and the crucible refractory and its related products,Such as crucible,retort,Plug head and,Nozzle etc.,With high fire resistance,Low thermal expansion,In the process of melting metal,By metal infiltration and erosion is stable,The high temperature,Good thermal shock resistance and good heat conductivity,So the graphite increases would harm its related products are widely used in molten gold directly in the process of the genus.