Graphite Electrode is mainly usded for steel-making in electric furnace,mineral hot furnace and electric resistance furnace.Graphite electrode conducts electric current into the furnace.Electric current produces arc in the smelting district in the electric furnace,when the temperature increase to about 2000℃,smelting begins.Our a series of graphite electrode is applicable to the common furnace and high power furnace with high pressure and short arc.

　　When loading and unloading the graphite electrodes by crane, a steel wire must be used as assistant tool. Hooking the bend of the package directly is prohibited. Before using the graphite electrodes, they need to dry near the electric furnace, the temperature should not exceed 150℃,the time should beyond 24 hours. When using the graphite electrodes, the workers must nip the steel bend by special tool, not by forklift.

　　The graphite electrode must be stored in a clean and dry room. If the graphite electrode is pilled up outdoor, it must be covered with the waterproof cloth and the floors of the pile is prohibited more than 4. In the delivery of graphite electrodes, a waterproof cloth must be covered on the graphite electrodes. When workers are delivering and pilling up graphite electrodes by forklift, collision is prohibited. Only one floor is allowed put each time, and the workers must pay more attention to the balance of the graphite electrodes, it can avoid the graphite electrodes sliding and broken

　　In the use of graphite electrodes , Clean open socket with compressed air, Screw nipple into socket carefully, not to damage threads. Bring down upper graphite electrode until opening between two electrode becomes 20 to 30mm. Clean out opening between graphite electrodes with compressed air. To avoid the graphite electrode breakage, remove any nonelectro conductive material from furnace. To avoid graphite electrode breakage be sure to place large scrap at furnace bottom and small scrap at top. Graphite electrodes should be stored in dry and clean place. To avoid shock and collision . Be sure to dry them up before use. Please feel free to contact us for the inquiry or demand of the graphite electrodes.

　　The graphite electrode paste is a conductive material that is used to supply iron alloy furnace, calcium carbide furnace and other electric furnace equipment.

　　The electric current is produced by the electric arc in the furnace. The electrode is very important in the whole electric furnace. Without it, the electric furnace can not be produced. To make the electrode in the arc temperature under normal working, must have high resistance to oxidation and conductivity, which only made of carbon material electrode, this nature, because the carbon electrode can withstand up to 35 DEG C arc temperature only slow oxidation.

　　Raw materials to be updated"

　　Now used in the production of electrode paste material basically is general calcined anthracite coal, metallurgical coke powder, medium temperature coal tar pitch; should be updated to use electric calcined anthracite, calcined petroleum coke, change coal asphaltenes. Pu calcined anthracite specific resistance is higher than that of electrically calcined anthracite 70%; metallurgical coke powder was calcined petroleum coke 2.5 times better than that of the resistance, modified bituminous coal of toluene insoluble, coking value is higher than that of the medium temperature coal tar pitch. After the replacement of raw materials, the quality of the electrode paste on a step.

　　Although raw materials of upgrading to increase the cost of electrode paste, electrode paste the price increase, but must be able to use to reduce the production cost of the electrode paste manufacturers, improve the use of factory production stability and the quality of the products. The total cost of using the manufacturer will not increase or increase is not much.

　　Also some of the electrode paste manufacturers to update one or two kinds of raw materials, not all updated, no effect, or the effect is not obvious. In fact, the overall integration of the effect is not reflected, in particular, the use of modified coal tar pitch there are technical problems, the need for professional and technical personnel guidance.

　　Equipment to "update"

　　Equipment is the production of hardware, in advocating science and technology progress today, the hardware is not hard, it means that the competitiveness is not strong. Although some enterprises also updated some of the equipment, but overall equipment is not enough, we must from the crushing, screening, grinding, mixing, kneading, forming a comprehensive package. Especially the paste forming can not be used. Paste molding machine not only can produce large pieces of paste into small pieces of paste, but also increase the plasticity of the electrode paste, to solve the use of large paste paste in the furnace to melt easily formed holes. The effect of electrode paste was improved.

　　The graphite electrode is mainly made from the petroleum coke and needle coke, coal tar pitch as the binder, after calcination, mixing, kneading, pressing, baking and graphitization, and made the processing machine, it is a conductor in an electric arc furnace to form arc release electricity for heating and melting of the charge, it can be divided into ordinary power, high power and ultra high power according to the quality index level.

　　Graphite electrodes has compact and even structure, good electric conduction and heat-conducting properties, high mechanical strength and strong oxidization corrosion resistance at high temperature through calcination, intermediate crushing, screening, dosing, mixing, compression, roasting, high pressure impregnation, graphitization, machining and other processes, it is widely used for arc furnaces and submerged arc furnaces to smelt various alloy steel, yellow phosphorus, industry silicon, brown aluminum oxide and other alloy and nonmetal materials and is an important component of modern raw material industry.

　　Graphite electrode is used in EAF and LF for steel making, as well as in electric smelting furnace for producing industrial silicon, phosphorus, etc. the graphite electrodes are widely use in electric furnaces and ladle refining furnaces for steel making and used in electric smelhing furnaces for producing industrial silicon, yellow phosphorus, corundum, nonmetals and so on. It is one essential part of the raw material industry.

　　The programmable properties of the graphite electrodes: good electrical conductivity;high resistance to thermal shock; high mechanical strength.Our products are characterized by superior compact structure, good electrical and thermal conductivity, high mechanical strength and high resistance to oxidation and corrosion in high temperature.

　　The advantage of the graphite electrode, graphite electrode is more and more widely used in the iron and steel industry.It makes less pollution and saves more power,it's good for our environment.The graphite electrode has long working-life,as it needn't to be changed often,that reduce the labor indensity of the works and avoid much danger.

　　Graphite electrode is mainly in the petroleum coke and needle coke, coal tar pitch as binder, calcination, mixing, kneading, pressing, baking and graphitization, and made the processing machine, is a conductor in an electric arc furnace to form arc release electricity for heating and melting of the charge, according to the quality index level, can is divided into ordinary power, high power and ultra high power.

　　Instructions

　　1, by the wet graphite electrode, before use to dry.

　　2. Remove the foam plastic cap on the graphite electrode hole.

　　3, compressed air oil and water to clean up the spare graphite electrode surface and the hole threads; avoid using wire or metal brush cleaning cloth regiment.

　　4, the joint carefully into the end of the graphite electrode (not recommended directly into the furnace to replace the electrode removed) electrode hole, not to impact the thread.

　　5, the electrode sling (the use of graphite material sling) screw into the other end of the electrode hole.

　　6, lifting the electrode, the electrode to the standby pad fluffer joint end, to prevent the ground damage joints; rings with a hook into the spreader after lifting, lifting the electrode to smooth, prevent the electrode from B and other loose or fixed device collision.

　　7, the electrode to be connected to standby hanging above the electrode, electrode alignment hole slowly after falling; rotating standby electrode, the spiral hook electrode together with rotation in two decline; the electrode surface is 10-20mm, again with the compressed air cleaning electrode two and exposed part of the joint end; at last completely decentralized electrode. Not too hard, otherwise because of violent collision, will cause the thread electrode hole and joint damage.

　　8, use torque wrench to spare the electrode, until the end of the two electrodes in close contact (the electrode and the connection of the connection is less than 0.05mm).

　　Graphite has high temperature strength, low thermal expansion coefficient, good mach inability and good heat and conductivity, so graphite electrode is widely used in metallurgy, electric furnace, EDM and other fields. In the field of EDM, the development of new graphite electrode material and its processing technology expands the application range of EDM and improves its performance. Compared with the graphite electrode and the copper electrode has the advantages of electrode consumption, fast processing speed, good machining performance, high processing precision, small thermal deformation, light weight, high temperature resistance, easy processing, surface processing of high temperature, electrode bonding etc.. Although graphite is a very easy cutting material, but because the graphite materials used for EDM electrode must have sufficient strength to avoid damage during operation and EDM process, at the same time, electrode shape (thin, rounded, sharp change) and also put forward higher requirements on the graphite electrode and the grain size and strength, which leads to in the process of graphite work piece easily broken, the tool is easy to wear. So how to prevent the work piece from crushing, improve the surface processing quality and reduce the cost of processing tools become an important problem of graphite electrode processing. Conventional turning, milling and grinding methods can meet the demand of machining simple shape electrodes, but the requirement of electrode geometry complexity has been increasing in recent years. High speed machining high surface quality and high processing precision make graphite electrode high speed machining has become a hot spot in mold EDM processing,

　　Finishing should make the processing stable, have smaller shape error and good surface quality, at the same time the tool wear is small. Tool wear and machining costs are major considerations. In finishing machining, the influence of milling direction on machining precision and surface quality should be taken into account. In the feed milling along the surface will appear pull milling (upward knife) or drilling and milling (down knife) phenomenon, tool deformation will lead to work piece contour deviation. The contour deviation of drilling and milling is less than that of drawing and milling, and the contour deviation of reverse milling is better than that of forward milling. Therefore, considering the critical condition of tool quality and the stability and reliability of machining process, the best method of milling along the contour should be the combination of reverse milling and plane contour milling. In addition, when the milling, the envelope contour milling tool life is greater than drilling milling, reverse milling when the two almost.

　　Graphite electrode material selection is based on a lot, but there are four main criteria:

　　1.Average particle diameter of materials

　　The average particle diameter of the material directly affects the state of the discharge of the material.

　　The average particle size of the material is smaller, the discharge of the material is more uniform, the discharge condition is more stable, the surface quality is better. For surface, high precision forging, die-casting molds, are usually recommended, the coarse grain materials, such as ISEM-3 etc.; for higher electron mold surface, precision requirements, recommend using average particle diameter in 4 m below the material, to ensure that by mold machining accuracy and surface finish. The average particle size of the material is smaller, the loss of the material is smaller, the greater the force between the ionic groups. For example: usually recommended in precision casting mold, forging mold, ISEM-7 has been sufficient to meet the requirements; but the customer for the accuracy is very high, to ensure that the smaller the material loss, so as to ensure mold precision and surface roughness. At the same time, the larger the particle, the faster the discharge rate, the smaller the loss of rough machining. The current intensity of the discharge process is different, which leads to the different energy of the discharge. But the surface finish of the discharge is also changing with the change of the particle.

　　2.Flexural strength of materials

　　The flexural strength of the material is the direct embodiment of the strength of the material, which shows the close degree of the internal structure of the material. The high strength of the material, the loss of its discharge performance is relatively good, for the high accuracy of the electrode, as far as possible to choose a better strength of the material. M1 can meet the requirements of general electronic connector mold, but some have special precision electronic connectors die, you can choose the same particle diameter, but slightly higher strength material M2 material.

　　3.Shore hardness of materials

　　Graphite is generally considered to be a relatively soft material in the subconscious mind. But the actual test data and application shows that the hardness of graphite is higher than that of the metal material. In the special graphite industry, the general hardness test standard is the shore hardness measurement method, the test principle and the metal test principle is different. Due to the layered structure of graphite, it has excellent cutting performance in the cutting process, the cutting force is only about 1/3 of the copper material, and the surface is easy to be processed after machining. However, due to its high hardness, cutting, the loss of the tool will be slightly larger than the cutting metal. At the same time, the hardness of the material in the discharge loss control is relatively good. In our EDM material system, for the application of more of the same size have two materials are available, a kind of hardness is slightly higher, a hardness is slightly lower, to meet the needs of a variety of different requirements of customers. . Mainly taking into account the various types of customers for discharge And the direction of mechanical processing.

　　4.Intrinsic resistivity of materials

　　According to the characteristics of the material for the statistics, if the average particle size of the same, the resistivity of the discharge rate will be smaller than the resistivity of the slow. For the same average particle size of the material, the resistivity of small materials, its strength and hardness will be slightly lower than the resistivity of the material. That is, the rate of discharge, the loss will be different. Therefore, it is very important to choose the material according to the practical application.

　　Because of the particularity of the powder metallurgy, the parameters of each batch material have a certain range of fluctuation. But the same grade of graphite materials, the discharge effect is very close, due to various parameters caused by the difference in the effect of the application is very small.

　　The choice of electrode material is directly related to the effect of discharge, to a large extent, the selection of materials is appropriate, determine the discharge speed, machining accuracy and surface roughness of the final.

　　These four kinds of data represent the main discharge performance of the material, and directly determine the performance of the material.

　　In twentieth 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 has a general impression: dirty, surface effect is not good, the processing efficiency is not high and so on. With the development of high and new technology, and constantly improve the manufacturing process of graphite material, it 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. Today, in the manufacturing technology leader in Europe, more than 90% of the electrode materials used in die and mold. Aerospace, automotive, home appliances, electronics and other mold has a large range of graphite as the electrode material, this significant

　　Owing to the high efficiency and high quality processing of graphite electrode, the change is attributed to the advantages of the graphite electrode.The choice of graphite electrode materials for electrical discharge machining (EDM) for graphite materials, mainly has the following 4 indicators directly determine the performance of the material: (1) the average particle diameter of the material. The average particle diameter of the material directly affects the state of the discharge of the material. Graphite materials the average particles smaller, more uniform material discharge, the discharge condition is more stable, surface quality is better, loss is small; average particle size is large, in the rough machining can get higher removal rate, but finishing surface effect is poor and electrode loss is relatively large. (2) the bending strength of the material. The bending strength of the material is a direct reflection of the strength of the material, showing the close degree of the internal structure of the material. The high strength of the material, the loss of its discharge performance is relatively good, on the high accuracy of the electrode, as far as possible to choose a higher strength of the material. (3) the shore hardness of materials. The hardness of graphite is higher than that of metal material, and the loss of cutting tool is larger than that of cutting metal. At the same time, the high hardness of the graphite material in the discharge loss control is good. (4) the inherent resistivity of the material. Inherent resistivity of the larger graphite material, the discharge rate will be smaller than the resistivity of the slow. The higher the inherent resistivity, the smaller the electrode loss, but when the inherent resistivity is high, the discharge

　　The stability will be affected.

　　Beijing Great Wall Co., ltd is a leading company of graphite product. We always offer the best quality and the competitive price for our customer. We are looking forward to your enquiry and cooperation in the future.

　　Graphite material has the advantages of high machining accuracy and good surface effect, especially in precision, complex, thin wall, high hardness material mold cavity processing has a greater advantage.

　　brief introduction

　　Graphite material has the advantages of high machining accuracy and good surface effect, especially in precision, complex, thin wall, Gao Ying material mold cavity processing has a greater advantage. Compared with copper, graphite material has the advantages of less consumption, high discharge speed, light weight, small thermal expansion coefficient, etc. Therefore, it has become the mainstream of the discharge machining materials.

　　advantage

　　One, fast speed;

　　Graphite discharge faster than copper 2-3 times, the material is not easy to deformation, 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, the graphite material thermal expansion coefficient only copper 1 / 30.

　　Two, light weight;

　　When the density of graphite is only 1/5, the large electrode can reduce the load of machine tool (EDM), and it is more suitable for the application of large scale mold;

　　;

　　Three, the loss of small;

　　Because the spark oil contains C atoms, in the discharge process, the high temperature leads to the C atoms in the spark oil is broken down, and the surface of the graphite electrode to form a protective film, which compensates the loss of the graphite electrode;

　　Four, 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;

　　Five, Because the cutting resistance of graphite copper is only 1/5, more easily by hand grinding and polishing operation

　　Graphite electrode scrap, refers to the waste after graphitization or after processing carbon products factory production of graphite electrode, graphite electrode and debris processing products when cut off. The export of graphite electrode usually broken, including graphite electrode scrap foundry used in steel factory.

　　Graphite electrode is made of coke and pitch coke as the main raw material, using coal tar pitch as binder, after more than 2000 DEG C high temperature heat treatment. So that the amorphous carbon conversion of graphite and users of a product, mainly in the metallurgical industry in arc furnace as conductive materials, smelting alloy steel, iron alloy, nonferrous metal and rare metal.

　　The main characteristics of the graphite electrode with carbon content in 99% above, ash is generally less than 0.5%, sulfur content less than 0.05 %, with good conductivity and good heat resistance.

　　The chemical properties of graphite electrode scrap is the same as graphite electrode, mainly low ash, good electrical conductivity, its main purpose is carbon products factory will be recycled to the graphite electrode scrap to 10 - 20% of the proportion of added ingredients for some products, also can be used for steel making carburant or raw material for producing plastic graphite tube.

　　The main reason, the adulteration of export graphite electrode is the same with the domestic market of counterfeit products, is profitable.

　　Carbon electrode and roasting carbon blocks and other non graphitized products is to anthracite coal and metallurgical coke as the main raw material, sometimes with a small Yao natural graphite or graphite fragmentation production of conductive material, so the ash is high, specific resistance to than graphite electrode 2 or 3 times, thermal conductivity and oxidation resistance of not such as graphite electrodes.

　　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.