In addition to good tools, coated cutting fluids, there is a new process for cutting off the thermal circuit.

As everyone knows, in the process of metal cutting and chip deformation due to friction, so that the cutting area had a high temperature, at the same time as the tool and the workpiece of different materials, a thermocouple poles caused thermal electromotive force, the DC current heat. It is easy to strengthen the oxidation process of surface of carbide turning tool,and accelerate the tool wear. Under certain conditions,a thermal electromotive force is also generated in the contact area between the tool and the machine tool, the contact area between the workpiece and the machine tool,and the friction pairs of the machine tool itself. During the cutting process, there is also a thermal magnetic effect and an electromagnetic effect. In the high temperature contact zone,the surface will also produce electron emission of discharge phenomenon.

In recent years, domestic and international science and technology researchers show that the heat caused by thermoelectric current generated in the cutting process and other factors, the two heat current is to form a loop through the machine tool workpiece tool system. At the same time, there is a local thermal current in the tool - workpiece limited contact area cycle, and therefore exacerbated the tool wear. So, to improve the cutting performance and improve tool life in addition to the above basic way, can also adopt a new approach,and the strengthening of carbide tool wear thermal flow effect to fight, to cut off the hot current loop.

Cutting method of heat current circuit is very simple, even if the tool insulation and machine tool or workpiece and machine tool, the thermal current loop cannot be formed by cutting area, so as to reduce metal affinity,reduce bue and scale production,so as to improve the cutting performance of carbide turning tool, improve the tool life and processing quality.

How to cut off the thermal current loop. On the lathe, in the various carbide turning tool with a bakelite pad knife plate or plastic pad knife plate, the knife rod under the plane, and the side of machine tool carriage of insulation; milling, planer, if the vise clamping the workpiece,and the workpiece between jaw pad of wood or rubber the insulation board,workpiece and cutter and clamp the drill; it can be made of high strength plastic and plastic handle shank drill cutter, the shank and the spindle hole insulation.

It has been proved by practice that cutting off the heat current circuit is especially suitable for the processing of high strength, high hardness and hard cutting materials to show the effect, and the durability of the tool is usually increased by 1~2 times. Therefore, it is one of the easiest and easiest methods to implement.

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Due to the high impact of high speed and high impact load on high speed milling,tungsten carbide cutting toolscan withstand the risk of breakage and fatigue at high speed. It turns out that in the case of repeated rotating load, 30% of the stress can cause the carbide to be damaged. So in high-speed cutting applications, the strength of the blades, the toughness and the resilience are the primary considerations. In addition, the high speed cutting tool material requirements: the blade surface quality and overall material of very low density of defects, and consistent with the subtle structural and fine grain size is the same important. Cutting material containing Cobalt (Cobalt) component of the higher, the greater the toughness and the fracture resistance of materials, the smaller the grain size, the higher the wear resistance, but in the process of cutting when the temperature increases, deformation resistance will be reduced. In the above tests, a typical tungsten carbide material is suitable for the application of aluminum materials for aerospace applications. A microstructure of a tungsten carbide type, WC -6co, shows the compact structure of uniform and fine grinding without alloy square particles. The uniform grain is about 1 mu m, and the hardness is analysed to 1630 HV30.

Crater wear, flank wear, the devolop tumor, edge defect and gap abrasion are the blades in the early failure of the main topic, and reduces the surface quality of workpiece materials. A surface polishing process called "mircrofinish", which USES a mirror (surface polished) blade, can reduce the wear and tear of the crescent, the edge defect and the debris tumor. The tool series did not use a special coating in the test,and all the tungsten carbide cutting toolswere carried out under uncoated conditions.

It has to be said that a revolutionary carbide blade design method has improved the quality of the structural components of the space industry and the surface surface of similar artifacts. By the blade, blade, blade axial ready-made tolerance,and in the process of cutting tool deformation produced by the deviation, can be used to the elliptical structure to a certain degree of compensation, and at the same time avoid the sharp edge of blade structure and formed by two milling knife pitch. (chip breaker with large positive rake Angle trough) and V groove design can make the cutting speed and feed the ascent to 7000 cubic centimeter clearance volume per minute, and maintain the good surface quality and smoothness. The design of the v-shaped slot allows the blade to withstand a strong centrifugal force, at a high speed of 40, 000 RPM. To achieve the reliable cutting process and the best surface finish, the additional factors such as the effect and vibration are also considered. Especially the analysis of the vibration, this is common in machining of tungsten carbide cutting toos and the spindle system of special natural resonance frequency excitation, increase the understanding of its technology application in the cutting tool performance and make a more correct guess. Light alloy aerospace applications thin-walled components, through the special design of carbide blade shape, selection of tungsten carbide and body set, make the processing application more effective, more productive, and at the same time to obtain a better surface quality. But in high performance (high quantity of chip removal) advances in the application of feeding and cutting speed, cutting tools, lathe spindle and manufacturers still faces from stability, the spindle design, process control system and security of each category of new challenge.

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The size of the extrusion allowance determines the magnitude of the required extrusion force, and the magnitude of the extrusion force has a direct bearing on the extrusion effect.If the extrusion allowance is too large, the extrusion knife will wear rapidly, resulting in a lower surface quality; if the extrusion allowance is too small,it will not meet the expected processing goal. Therefore, the minimum extrusion allowance should be chosen as long as the extrusion accuracy is guaranteed. Generally, when extruding carbon steel and alloy steel material, the extrusion allowance can be selected from 0.025 to 0.04mm, and 0.03 to 0.05mm should be selected when squeezing the cast iron. When the workpiece material is soft (such as non-ferrous metal) can choose larger extrusion margin; workpiece size is small, should choose smaller extrusion margin, in order to prevent overall deformation. As the extrusion allowance is affected by extrusion, surface hardness, surface roughness of workpiece before extrusion and workpiece wall thickness, it is better to test extrusion before machining to determine the optimum extrusion parameters. High speed extrusion finishing can make extrusion cutter and workpiece surface contact zone temperature, workpiece surface yield strength decreased, the workpiece is easy to deformation and lower surface wave in the trough, thus improving the surface roughness of the workpiece. But if the extrusion speed is too high, it will destroy the lubricating oil film, which will easily cause burns or scratches on the surface of the workpiece. Therefore, there exists an optimum speed of light absorption (which can be obtained by experiment). When processing ferrous metal, the extrusion speed can be selected between 0.5 and 1m/ s, and the amount of the knife can be selected between 0.01 and 0.03mm/r. The bigger value is taken when machining the excircle, and the smaller value is selected when machining the inner hole. The following problems should be paid attention to in extrusion processfor carbide turning tools:

The working parts shall be the straight line of 3 to 5mm on the extrusion edge, and the tungsten carbide turning tools should be squeezed about 1mm higher than the center. Extrusion process should be adjusted according to the various phenomena produced by the workpiece surface. Such as the workpiece surface pitting or scratches, extrusion showed that blade surface roughness, burnishing speed; the surface peeling phenomenon indicates that the large amount of repeated extrusion, extrusion or workpiece material ductility. Lubrication and cooling in extrusion process are very important. Before extrusion workpiece surface does not allow the existence of rust, oil, iron, dust, lubricating and cooling fluid should be injected into the full extrusion process, to take the heat generated in the extrusion, prolong the service life of extrusion knife. Usually, the mixture of oleic acid and kerosene can be used to squeeze the cast iron. When it is used to squeeze carbon steel and alloy steel, oil can be used as a cooling lubricant.

The extrusion test and the processing practice show that the cold extrusion finishing of the workpiece with carbide turning toolson the surface has the advantages of reliable quality, simple operation, economical and practical, high efficiency and low cost. Before extrusion workpiece surface roughness is Ra3.2 ~ 1.6 m after extrusion surface roughness is Ra0.8 ~ 0.2 m, improve the rate of up to 70% ~ 90%; by extrusion can also reduce the size of the workpiece diameter tolerances; extruding after burnishing hardening layer of workpiece is 3mm, which can greatly improve the fatigue strength of the workpiece and anti corrosion ability. If the extrusion knife is mounted on a vertical lathe, extrusion of the oversize workpiece beyond the grinding range of the grinding machine can be carried out. The extrusion processing method has wide application range, and can be used for processing ferrous metal materials and processing non-ferrous metal materials.

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Thermal sprayingis a series of process,in the process, fine and dispersed metal or non metal coating material in a molten or semi molten state, deposition to a substrate surface after preparation, forming a spray deposition layer. The coating material can be powdered, banded, filamentous or rod-shaped heat. Spray gun from fuel gas, arc or plasma arc with the necessary heat, the thermal spraying material is heated to a plastic state or molten state, and then subjected to acceleration of compressed air, the constrained particle beam impact onto the substrate surface. The impact to the surface of the particles, and the deformation by stamping, forming a laminate sheet. The adhesion after substrate surface preparation, then cooled and piled up, eventually forming a layered coating. The coating for different coating materials can realize high-temperature corrosion resistance, abrasion resistance, heat insulation, anti electromagnetic wave function.

The correct choice of thermal spray coatingmaterial is the key to ensure the work required for the properties of the coating. The coating materials selection, should first consider the working conditions and performance of workpiece coating required, but also consider the workpiece material, batch, economy and intends to adopt the method of thermal spraying coating. According to the function of the coating can be divided as the corrosion resistant coating, abrasion resistant coatings, friction reducing and sealing coating,high temperature resistant thermal barrier coatings, insulation or conductive coating, the size of repair coating.

The surface of the workpiece after coating in the rejection caused by failure reason is often not a single factor, so can meet the requirements of working conditions and performance of the coating does not necessarily exist simple relationship should be analyzed in detail. According to the working conditions,and reference and experimental data on the coating structure, physical, chemical, mechanical and other comprehensive performance consider, in order to determine one or several kinds of coating materials.

Wear resistant coating is one of the main fields of the application of surface coating technology. Although there is a general relation between the hardness and wear resistance, hardness and wear resistance but not entirely representative of the surface coating. Because of the different types of wear properties of material is not the same, and in the wear and often accompanied by shock, corrosion influence of fatigue, and temperature.

The choice of surface coating materials can not blindly pursue high performance or high price of the coating material, resulting in unnecessary waste of material price can not be used as selection of thermal spray coating quality standards, in order to meet the working conditions of reaction requirements, as far as possible the use of cheap coating materials, is particularly important in mass production when for example, can use the material of Ni based alloy coating without cobalt base alloy coating materials.

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A sound and effective market regulation mechanism and indirect regulation of tungsten industry policy will be conducive to environmental protection. To increase the production specification mining tungsten supply gap makes most of tungsten concentrate holding the goods cover Xishou mentality increasingly strong, tungsten concentrate prices high stalemate.

Downstream of the tungsten carbide alloy from the market performance in general, enterprises and products factory new orders is not much, but the cost is behind the leading price; tungsten materials market turnover flat. The price of tungsten carbide powderdespite a slight boost, but the downstream demand is not increased significantly, the market transactions to complete pre orders for the Lord, so the short-term market will be stable in tungsten carbide powderstrong. Indicates that the tungsten market will toward healthy and stable direction, the market will follow in the footsteps of tungsten carbide powder, the prospects for the better.

tungsten carbide powderwith tungsten oxide as raw materials, reduction with hydrogen in four tube muffle furnace or multi furnace, particle size from 0.6-30 microns. The main points of coarse, fine granularity, few, silver powder, impurity content based on the national standard.

Made by hydrogen reduction of tungsten trioxide or ammonium paratungstate. Prepared by hydrogen reduction process of tungsten carbide powderwas generally divided into two stages: the first stage in the 500 ~ 700oC temperature, were reduced to two tungsten oxide; second stage in the 700 ~ 900oC temperature, two tungsten oxide also into tungsten carbide powder. Redox reactions often in tubular furnace or rotary furnace.

The performance reduction of tungsten carbide powder(such as purity, particle size, particle size etc.) depends mainly on the reduction process. The reduction of tungsten carbide powderin tube furnace, the main parameters affecting the reduction rate is reducing temperature, loading amount of tungsten oxide in burning boat, boat speed, the water content in hydrogen flow and hydrogen gas. With the increase of reduction temperature, the particle size of tungsten carbide powderbecame thick.

Preparation of tungsten carbide powderin hydrogen reduction method, and early used tungsten oxide carbon reduction method, tungsten carbide powderpurity reduction temperature is higher than the 1050oC. obtained by this method is low. In addition, using aluminum, calcium, zinc and other working process of tungsten oxide is in progress. For the special use and high requirement purity, ultra fine grained tungsten carbide powder, tungsten chloride is the development of the hydrogen reduction of tungsten carbide powdersize to be less than 0.05 M.

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Perhaps the definition of tungsten carbide coating and many people have some understanding, and for their production methods, it is a little strange. The tungsten carbide coating by HVOF spraying tungsten carbide cobalt based alloy powder or nickel tungsten carbide alloy powder and chromium based alloy powder of tungsten carbide hardness can reach HV1200 temperature of 850 degrees, so that the valve spare parts,wear resistance,corrosion resistance, high temperature resistance, oxidation resistance. More than manual welding, chrome, carburizing, quenching and tempering, process, production efficiency can be increased more than 2 times, the production cost is reduced by more than 50%, service life can be extended several times.

The tungsten carbide coating, interstitial carbon atoms embedded in tungsten metal lattice, does not destroy the original metal lattice, formed interstitial solid solution, so it is also called the interstitial (or insert) compound. Tungsten carbide by high temperature heating a mixture of tungsten and carbon, hydrogen or hydrocarbon can accelerate the reaction if. Oxygen containing compounds for preparation of tungsten products, and ultimately must be vacuum treatment at 1500 DEG C, to remove carbon dioxide. Tungsten carbide should be machined at high temperatures, making cutting tools, structural materials, kiln jet engine, gas turbine and nozzle.

The corrosion and corrosion of super hard coating, including those containing tungsten carbide coatingsare widely used in mechanical engineering used in the production of various products and tools. This coating has high corrosion resistance, high chemical resistance and high abrasion resistance, thus significantly prolonged mechanical engineering products in the harsh operating conditions and tool life.

However, the rate of synthesis of tungsten carbide is very low, and when the tungsten carbon layer growth, the internal stress of the coating increased sharply, resulting in coating delamination. So through the PVD method cannot produce a sufficiently thick coating. In addition, the nature of physical vapor deposition method is not suitable for coating deposition with complex shape parts, the it is unlikely that the coating is deposited on the covered part relative to the X-ray part.

Chemical vapor deposition (CVD) eliminates these disadvantages. The.CVD method can be used to deposit high wear resistance and high corrosion resistance coatings on substrates and components with complex shapes

In a typical CVD process for composite coating deposition, heating in the reaction chamber and the substrate, pre mixed gas phase reagent into a reaction chamber.The composition and process of change of the reaction mixture parameters (substrate temperature, the reaction mixture, the reaction mixture velocity, total pressure, the gas temperature), can be a variety of coatings.

In the CVD method of tungsten carbide coatingdeposition, only the fluoride method may form tungsten carbide with high quality at low temperature. In order to achieve this purpose, can be in the CVD process of six tungsten hexafluoride, a mixture of hydrogen and carbon containing gas by thermal decomposition.

A variety of reagents can be used as carbon containing gases such as two methyl ether, amine, propylene, etc. one or two kinds of tungsten carbide can be synthesized by one of them.

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Have to say,cemented carbide rods for light weight and high hardnesssubvert the traditional tungsten cobalt alloy material, reached the foreign advanced level and fill the gap. At the same time, than imported products in the market price low nearly doubled, greatly reduce the production cost and improve the competitive ability of products.

The rapid development of foundry machinery industry, requirements of cutting speed, feed volume, high precision, long service life, however, the traditional hard alloy cutting tools have been unable to meet the above requirements. In foreign countries, super cemented carbide rodshave as deep processing instruments. At present, Chinese cemented carbide industry structure is not reasonable, more in the low-end products and high-end product development is slow, heavily dependent on the United States, Europe,Japan imports, especially in the fields of research, related work is still in the stage of system modeling and simulation,which has not yet formed independent intellectual property products and mass production.

5 years ago, a research group in the study of a new generation of cold bit alloy bar products for a long time, the high speed dry cutting of stainless steel and other materials in the process of cutting red hardness and toughness of the poor, after testing hundreds of times, by adjusting the formula and sintering of powder and other measures, independent research and development of a titanium the base matrix, light weight and high strength alloy bars, the proportion of 7.2g/cm3, greatly improving the cutting tool materials such as stainless steel stem at high light in the process of the service cycle.

In order to overcome the defects of poor toughness of cemented carbide, by adding other elements, obviously improves the mechanical properties and physical properties of hard alloy, light alloy microstructure, fracture toughness and flexural strength improved, wear resistance, high temperature resistance, impact resistance, resistance to surface diffusion and antioxidant capacity were improved in different degree.

The above describes the difference between foreigncemented carbide rodsand China’s. I believe that we should word hard alloy rodare not unfamiliar, so we all know what are the use of hard alloy bar? For everybody here for detailsbelow:

1. It applies to micro drilling

2.Ithas good abrasion resistance and bending strength, mainly used for the production of extruded bars, suitable for general drill tool wear parts.

3.Ithas good abrasion resistance and bending strength, mainly used in the production of extruded bars, making small diameter micro drill tool, the use of clocks and other processing, whole reamer tools and wear parts.

4.Cemented carbide rodsfor a fine granular tungsten steel, tungsten steel bar has the high hardness, good bending strength, wear resistance and not easy to collapse, not easy to fracture. The micro drill is a special material, widely used in tungsten steel milling cutter, knife and wear parts.

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Modern textile machinery especially chemical machinery, light, energy saving is fast, the direction of development. The high-speed moving parts of many energy consuming general as far as possible the use of lightweight alloy matrix (such as aluminum) surface hardening and functional coating composite manufacturing.

Textile parts requirements have a well-defined surface shape, which is due to the contact with the fibers in these parts must be oriented, winding, spinning and drawing and winding required fiber effect. For the design requirements of the special surface tension, and the fiber does not cause hair pulling and scrapes, and must also have sufficient wear resistance, in order to meet the requirements of long time stable spinning work, especially the large-scale production of textile industry, this requirement is more prominent. The design and function of the system by thermal spraying coatingpreparation can meet.

The textile industry in the use of A12O3 TiO2 coating with a wide range, although this kind of coating has good resistance to corrosion resistance. But due to A12O3 and TiO2 and other oxides with different proportions of ceramic coating materials with new technology, such as polishing treatment, different after plasma spraying brush after grinding, grinding and sanding the processing method, the coating can obtain different hardness with different surface condition, in order to meet the needs of all kinds of textile properties of fiber. Its characteristics are as follows:

excellent wear resistance of high speed fiber, high hardness and low surface energy properties of oxide ceramic coating, determine its essential wear and friction reduction, which is not easily replaced by other materials

Different ceramic coating after the processing method to make the surface with different profiles, so there will be a different friction. The fiber can be applied to moderate "twist", so that the fiber to achieve the necessary strength and toughness.

the use of spray sprayed surface particles (raised by numerous appropriate processing to eliminate the sharp peak), provide an appropriate surface roughness, and the effect of fiber fiber surface to obtain the necessary "Cashmere", achieve good dyeing, have certain moisture absorption.

Cr2O3 than A12O3 with high hardness and chemical corrosion resistance. Carbide coatings mainly provide abrasion resistance, in the textile industry has a special role. Most parts of textile machinery needs to prepare the surface was smooth, delicate, uniform surface ceramic coating. The thermal spraying processmust grasp the following three aspects: one is the surface roughening sandblasting with fine grained corundum than 0.25mm: two is the particle size range of 5-45 m three powder spraying; coating thickness is generally 0.15-0.20mm. these applications has formed a system in our country, the scale and standardization. The application of textile and chemical fiber industry of ceramic coating ceramic coating accounted for most of the market.

The series of models of welding dryer, water roller, roller roller, ventilation; mercerizing machine under the camshaft roller, and various import cloth iron plate, gear, shaft; guide roller, performance decline in the use of the joint locomotive fabric shaft, the surface wear can by thermal spraying with high performance alloy, ceramic and polymer materials processing technology, improve and extend the mechanical components of the performance and service life.

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With regard to the use of wire drawing die, there are many claims that the development of industrial production in China's mold industry is still strong momentum, especially in the mold of the drawing die use efficiency is very high. Because there are other die drawing die without the absolute advantage. Industrial machinery production of the mold above the size of a lot of models, each mold has its own unique efficacy. The advantage is that the mold can according to a model made numerous the same product, this can save a lot of manpower and working time, improve work efficiency, so the emergence of mold really accelerated the pace of industrial production.

1.high drawing efficiency. Wire drawing diein the use of the necessary maintenance of the life of the wire drawing die and the surface quality of the wire is very important, it is recommended that the customer polycrystalline diamond wire drawing die every 24 hours for a maintenance. Within 24 hours, the pore diameter of polycrystalline diamond wire drawing die is small, and the change rate of wire diameter is very small.

2.good wear resistance, long life. The life of the polycrystalline diamond drawing die is about 30~50 times of that of the cemented carbide die, so it is not necessary to change the die frequently during the drawing process. The variation of the diameter of the wire drawing die in the unit time is very small, and the size of the drawn wire is small.

3.save raw materials. If the drawing surface is coated with a metal wire, stop the electroplating process in the drawing process and did not stop, which leads are electroplating wire surface plating thickness exceed the standard required to start drawing, cut wire thickness exceed the standard, resulting in enormous waste, waste more more downtime.

The wire drawing mold is used in what areas? In the production or processing of high-precision materials, requires the use of wire drawing die, then drawing die in what area is used? And what are the steps of drawing technology of drawing die? These problems, we have a look.

Dies use a wide range, such as electronics, radar, television, appearance and aerospace and other fields, all kinds of alloy wire is drawn out by diamond wire drawing die, diamond wire drawing die because of the natural diamond as material, which has extremely strong abrasion resistance, high service life. Production technology of drawing die with set, contains several technical steps die, draft, turning etc..

Wire drawing dieis a metal wire through a mold to make it from coarse to fine, gradually reached the scale of the needs of everyone, this special mold that is drawing die. The die core of a wire drawing die is usually made of natural diamond, artificial diamond.

Wire drawing die includes diamond drawing die, plastic drawing die and so on. There are many uses.

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By metallographic and hardness measurement shows that the cutter body by high strength after quenching, high frequency welding process in martensite with high hardness to Soxhlet size of pearlite and chunky ferritic low strength and hardness. In this transformation, the hardness and strength of the cutter body is greatly reduced. This shift is due to the cutter body high-frequency welding head, welding temperature is higher, generally 900 to 950 DEG C; this high temperature quenching after the knife body near the weld are normalized, resulting in the hardness, greatly reduced strength. From the crater near the area because of heat conduction welding, the region temperature, high temperature caused by tempering in the region, and also makes the area of strength, hardness decreased. The tool is used, the tool damage is also the most easy to appear in the welding position that the cutter body hardness welding, strength degradation is the tool Important cause of damage.

In order to find out the knife body first and then quenching on the cutter body causes high-frequency welding method of making hard alloy knife head has the above defects, we do the following test: first made the test to determine the shape and size of milling cutter, the test principle is easy to test metallographic sampling. The cemented carbide insert head at 900 DEG C the heating and cooling, the cutter head hardness does not change significantly.

cemented carbide insert in quenching, if the quenching medium is saline,cemented carbide insert and cracking due to rapid cooling; if the medium is oil, cooling, heating at 900 DEG C, cemented carbide insert without cracking. It is proved that the welding tool used in quenching, the knife should be used in alloy steel oil cooling can be hardened, but can not use oil quenching hard, carbon steel hardened to water, such as a knife body made of 45 steel or high carbon steel welding tool, after quenching, the knife body material should be changed into alloy steel.

In order to prevent the solder melting at the heating process of the cutter body position change welding, solder flow or the cutter head and the cutter, quenching temperature should not exceed 900 degrees, 850 degrees below the best quenching temperature. Most of the alloy steel are near 850 DEG C, and in general, high alloy steel quenching temperature is over 900 DEG C, so the whole appliance when quenching, the knife body material should be selected in small, high alloy steel, such as forming the previously mentioned flat drill, cutter body material is W18Cr4V, quenching temperature above 900 DEG C, the overall quenching cannot.

According to the above three, we first test for quenching cutter, cutter body materials, milling and quenching test before quenching after welding is the same as that of quenched from the knife body weld 1mm metallographic test, microstructure of martensite ferrite, hardness 52 ~ 54HRC metallographic cutter body quenching and when the cutter head weld hardness. Milling cutter, drill the whole quenching test and into the formal production and achieved good results.

Note that the whole milling cutter when quenching, the knife head is welded on the cutter body, and the cemented carbide hard and brittle, a little bump will cause the scrap off angle, quenching, tempering and sandblasting after all must be careful not to bump.With the overall quenching of the cutter, the hardness of the cutter body at the welding seam has been greatly improved compared with that of the original quenching tool.

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Tungsten carbide is a hard alloy material to compound metal and metal bonding process made by powder metallurgy. It has high hardness, wear resistance, strength and toughness, heat resistance, corrosion resistance and a series of excellent performance, especially high hardness and wear resistance of it, even at a temperature of 500 DEG C also remained unchanged, at 1000 degrees C still have high hardness. Based on characteristics of hard alloy, make it become the main material of the insert. However, insert NC CNC grinding tungsten carbide in the production cost occupies a big proportion, reduce the cost of grinding become the big insert manufacturers need to solve the problem nowadays,The main use of tungsten carbide inserts, diamond grinding wheel grinding diamond wheel. According to the bond can be divided into different resin bonded diamond wheel,vitrified diamond wheel,metal combined with Ji Jingang Grindingwheel. Compared with resin bond diamond grinding wheel is widely used in CNC carbide insert grinding in the metal bonded diamond grinding wheel has the advantages of high strength, good abrasion resistance, maintain a good shape, can bear large load, but also its self sharpening, high dressing.

In the process of grinding hard alloy insert, abrasive wear, grinding force increases, resulting in abrasive broken or off, exposed to the sharp edge, this property is called "self sharpening grinding wheel. Self sharpening grinding to normal in a certain period of time, but beyond a certain time after work that should be finished manually, so as to avoid the increase of grinding force caused by vibration, noise and damage the surface quality of the workpiece. The resin bonded grinding wheel has good self sharpening, the machining precision consistency by trimming effect; metal bonded grinding wheel self dressing, dressing in the lack of tungsten carbide debris blocking wheel gap, workpiece. Size consistency, when the debris after the optimal dressing parameters of the grinding wheel surface clogging timely cleaning, dimensional accuracy of the workpiece metal bonded diamond grinding wheel and the workpiece and grinding the resin bonded grinding wheel Consistency reached the same level.

On the market of the same specifications of metal bonded grinding wheel than the resin bonded grinding wheel offer about twice as high, so only consider the price and the ratio of grinding wheel, the choice of metal bonded diamond grinding wheel for tungsten carbide insertis more cost advantage.

The metal binding agent diamond grinding wheel with resin bonded diamond grinding wheel workpiece size precision consistent dressing parameters after optimization; the surface of metal bonded diamond grinding wheel processing products is higher than the value of the roughness of the resin bonded diamond wheel processing products, but it can meet the requirements of CNC carbide insert grinding surface is required; metal bonded diamond grinding wheel the grinding ratio is higher than that of resin bonded diamond wheel.

The price and the grinding ratio of the two kinds of grinding wheels on the market are analyzed comprehensively. It is more economical to use the metal bonded diamond grinding wheel to grind cemented carbide inserts.

For more information,just check out this site at http://www.wococarbide.com/Transaction/en_information.html

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In the small wire rod, natural diamond drawing wire, polycrystalline diamond and CVD coating, wire drawing diesmaterials commonly used in drawing. The small diameter wire, CVD coated diamond model to overcome the anisotropy of natural diamond die, also has excellent strength and hardness, drawing the highest yield, surface quality to meet the requirements. The test proved that the CVD coating diamond wire drawing die life is equal to the natural diamond die, the qualified rate is high, the surface quality is better than domestic polycrystalline diamond. Therefore, for small diameter wire drawing processing, CVD coating diamond wire drawing die is the ideal choice.

Although the dies can be used for processing all kinds of steel, copper, tungsten, molybdenum and other metal and alloy material, but dies of different materials each have its applicable range of processing of different materials of the same wire drawing diesworking when the wear form and service life are very different, so the reasonable selection of die material is the key to ensure the successful application of drawing die. Different materials have a relatively reasonable processing object. Rationality of drawing processing mainly refers to both mechanical and wire drawing die, the physical and chemical properties, in order to obtain the long service life of the die. For example, in the drawing of the same diameter copper wire, polycrystalline diamond die life is the life of hard alloy die 300 ~ 500 times, drawing nickel wire is only 80 ~ 100 times, drawing molybdenum wire, the only life of hard alloy die life of 50 to 80 times, while drawing carbon steel, poly crystal diamond die The life span is only 20 to 60 times of the cemented carbide die.

Because the system of matching theory of domestic wire drawing die and lack, resulting in blind choice, resulting in a waste of resources.wire drawing die wear is very complicated, generally divided into two categories of damage and friction wear. Drawing die failure can be divided into ring failure, shear failure and tensile failure, supporting surface damage the friction and wear, can be divided into wear, friction and wear, corrosion wear, abrasion and fine particle wear resulting. Working conditions (wire materials, drawing materials, lubricants etc.) different, the drawing die wear and damage has its unique process. Relationship between the wear failure of drawing die in essence, are interrelated. The inside of wiredrawing diesis very subtle, some factors may also play a role, the role of their superposition is very complex, not easy to understand. It may be a factor of the role will hide The role of other factors, the above-mentioned damage and friction and wear form often intertwined,increase the difficulty for the failure analysis of wear mechanism of dies. But in general, the wear resistance of various materials dies from high to low ranking is: diamond wire drawing die of natural diamond (without considering the anisotropic problem) - alloy die - hard alloy ceramic wire drawing die die has been eliminated.

Through the study of drawing die material, wire drawing die is towards high strength, high hardness,high wear resistance of the development of new materials,all meet the requirements of emerge in an endless stream, the wear resistance was drawing increasing, wear, damage and delayed the time of increasing the service life of wire drawing die,the machining accuracy is improved to some extent. The scope of drawing is gradually expanding,from coarse to fine wires with various specifications can be processed, and the emergence of irregular shaped mould for processing wire.

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High speed carbide end mills and carbide of different places that need high speed steel after heat treatment process to improve its hardness, ordinary steel no matter what as long as there is no steel after heat treatment, it is soft.

Cemented carbide end mills is made of hard alloy round bar is made, with universal CNC tool grinder for grinding wheel for steel processing equipment, processing tools, by computer or G code editing processing route of manufacturing a molding and processing method, has the high efficiency, high precision, mass production has the advantages of good consistency so, for the shortcomings of most equipment for imported products, the general price of 1 million yuan or more.

There is the use of ordinary processing equipment, divided into slot grinding machining spiral groove end tooth machining end and end after trimming machine (week tooth machine) this week processing tooth, products need to be processed according to various sections separately, the cost of manpower cost is very high, and the quality of mass production the products are skilled workers themselves rely on operating machine to control, so poor in accuracy and consistency.The quality of cemented carbide end millsalso depends on the selected hard alloy material grades, the general is processed according to the material selection and the gold medal, in general the alloy grain small as possible.

Now the international popular such as the United States is M42 high speed steel grades of high-speed steel and M7 grades, the best comprehensive performance of M42 high speed steel, either by grinding, hardness and red hardness are very good, but the M42 high speed steel containing 8 cobalt, cobalt is scarce non renewable resources, so the price is very expensive M42 in general, 30-20 million, of course, individual production expected recovery of domestic M42 prices will be cheaper, in addition to the popular W18, M2, W9, high speed steel and M2AL, W9AL and other high performance HSS, which focuses on M2AL and W9AL, as the name suggests, the two brands of high speed steel is made with aluminum based on M2 and W9 and aluminum, equivalent to the role of bond of the steel particles close together, so the steel quality will be good, especially M2AL is our specially developed high speed steel to replace M42, the tool used to fabricate this high speed steel in 80 years On behalf of the foreign market once greatly welcomed, but with the market competition and the high speed steel excessive use of recycled material to manufacture, now the performance of this kind of steel or worse than M42, but for the material being processed some special requirements are not particularly high, M2AL is a good choice, after all, much cheaper than M42.

The thickness of the coating on the surface of the milling cutter is about 3 mu. The main purpose is to increase the surface hardness of the milling cutter,general speaking,carbide end millsin hardness and toughness are incompatible, and the emergence of coating technology in a certain extent to solve this situation, such as the selection of cutter Matrix Toughness material, coating on the surface coated with high hardness, such as milling performance has been improved dramatically.

For more information,just check out this site at http://www.wococarbide.com/Library/libraryinfo/id/817

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High speed carbide end mills and carbide of different places that need high speed steel after heat treatment process to improve its hardness, ordinary steel no matter what as long as there is no steel after heat treatment, it is soft.

Cemented carbide end mills is made of hard alloy round bar is made, with universal CNC tool grinder for grinding wheel for steel processing equipment, processing tools, by computer or G code editing processing route of manufacturing a molding and processing method, has the high efficiency, high precision, mass production has the advantages of good consistency so, for the shortcomings of most equipment for imported products, the general price of 1 million yuan or more.

There is the use of ordinary processing equipment, divided into slot grinding machining spiral groove end tooth machining end and end after trimming machine (week tooth machine) this week processing tooth, products need to be processed according to various sections separately, the cost of manpower cost is very high, and the quality of mass production the products are skilled workers themselves rely on operating machine to control, so poor in accuracy and consistency.The quality of cemented carbide end millsalso depends on the selected hard alloy material grades, the general is processed according to the material selection and the gold medal, in general the alloy grain small as possible.

Now the international popular such as the United States is M42 high speed steel grades of high-speed steel and M7 grades, the best comprehensive performance of M42 high speed steel, either by grinding, hardness and red hardness are very good, but the M42 high speed steel containing 8 cobalt, cobalt is scarce non renewable resources, so the price is very expensive M42 in general, 30-20 million, of course, individual production expected recovery of domestic M42 prices will be cheaper, in addition to the popular W18, M2, W9, high speed steel and M2AL, W9AL and other high performance HSS, which focuses on M2AL and W9AL, as the name suggests, the two brands of high speed steel is made with aluminum based on M2 and W9 and aluminum, equivalent to the role of bond of the steel particles close together, so the steel quality will be good, especially M2AL is our specially developed high speed steel to replace M42, the tool used to fabricate this high speed steel in 80 years On behalf of the foreign market once greatly welcomed, but with the market competition and the high speed steel excessive use of recycled material to manufacture, now the performance of this kind of steel or worse than M42, but for the material being processed some special requirements are not particularly high, M2AL is a good choice, after all, much cheaper than M42.

The thickness of the coating on the surface of the milling cutter is about 3 mu. The main purpose is to increase the surface hardness of the milling cutter,general speaking,carbide end millsin hardness and toughness are incompatible, and the emergence of coating technology in a certain extent to solve this situation, such as the selection of cutter Matrix Toughness material, coating on the surface coated with high hardness, such as milling performance has been improved dramatically.

For more information,just check out this site at http://www.wococarbide.com/Library/libraryinfo/id/817

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High speed machining has been widely regarded as the processing technology to increase production and reduce manufacturing cost. The concept of dry machining or micro lubrication is now the main goal of the industry to reduce environmental and production costs. Productivity is the most important factor for tool manufacturers and suppliers. Cutting performance (cutting speed, unit time cutting) increased by 20%, manufacturing costs will be reduced by 15%. More stringent machining requirements require further development of cemented carbide cutting tool materials and coatings to improve machining conditions and improve tool design.

From the current situation, domestic cemented carbide indexable tool market share is lower than the import tool, the reason mainly has the following several points: 1 the quality of the products do not have a strong sense of some domestic tool producers lack of adequate quality consciousness. The quality of the indexable inserts in China is poor, the varieties are few and the specifications are incomplete. From the appearance quality of the product, the appearance, color and texture of the imported tools are superior to the domestic ones. In the performance of the products, compared with the domestic tool, machining tool imports of high precision and good stability, high durability, high removal rate, tool and accessories have good interchangeability, the general assembly can achieve the precision. 2 pre-sale customer service service is not perfect in many foreign companies have tools for users including tool selection, supply, adjustable, timely replacement and thoughtful service, and many domestic tool manufacturers in this regard is not doing enough, simple and extensive service. 3 small workshop production still accounts for a large proportion due to economic reasons, some domestic tool manufacturing plant small workshop production still accounts for a large proportion, low level of processing technology, simple equipment, to ensure product quality. It is difficult to eliminate the quality problems of the tool products by the machining quality and assembly quality.

Recent data concludes that he tool material has entered the era of development with hard alloy represented, compared with high-speed steel, cemented carbide has better performance and higher cutting efficiency, and super hard materials, is an important guarantee for the efficient processing of modern cutting technology. There is no good tool material, any tool innovation and cutting processes are the lack of the necessary material basis. To solve this problem fundamentally, will involve the industry structure adjustment, speed up with hard alloy material and tool research and development capabilities of the production base of the construction process, the rapid increase of cemented carbide cutting tools account for the proportion of all cutting tools.

Matters needing attention

1, the proportion of cemented carbide material, therefore, the size and quantity of large, need special attention, should be treated as heavy objects.

2, carbide cutting tools in the grinding process will produce higher cutting temperature and dust, aerosol. When the dust, mist contact with eyes or skin, as well as by the human body will be harmful.

3, cemented carbide cutting tools for grinding, it is recommended that you use a local dust collector, with masks, eyes and gloves and other protective measures. If the hands are stained with dust, wash thoroughly with soap and water.

4, do not work in the dining room, the meal should be washed clean. Application of vacuum cleaner or washing method to remove the dust on the clothes, do not hand beat dust.

5, repeated or long-term exposure to dust will affect the skin, respiratory tubes and heart.

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Multifunction supersonic flame spraying with oxygen kerosene supersonic flame spraying (HVOF coating) and air kerosene supersonic flame spraying (HVAF) function, the flame temperature and velocity can be adjusted continuously in a large range, can meet various requirements of spraying materials, the preparation of high bonding strength, low porosity, can be prepared abrasion resistance, corrosion resistance, thermal insulation, sealing, conductive coating, in mechanical manufacturing,aerospace,water conservancy and electric power,metallurgy,petrochemical, paper and leather and other fields have a broad application prospect.

In the metallurgical industry, there are a variety of roller and roller need to wear the reinforcement or repair, wherein, the continuous annealing furnace bottom roller is an important one. The roller surface of the nodulation phenomenon, in fact is adhesive wear. In order to strip production caused by reduced nodulation loss, thermal spraying method widely used in roller surface spraying usually. NiCr-Cr3C2 coating,which has high temperature oxidation resistance, thermal shock resistance, wear characteristics, can make the bottom roller continuous working for a long time at high temperature, and subjected to thermal shock cycles. When the working temperature of the furnace roller exceed 900 DEG C, the general spraying Co alloy. With the advantages in the richly endowed by nature of carbide ceramic spraying supersonic flame spraying and metallurgical industry, there is a great demand for carbide metal ceramic coating, so get a lot of applications. Multifunction supersonic flame spraying Co based WC coating on galvanized roll into pickling The surface is reinforced to improve the service life.

In the oil industry, machinery and equipment, such as a large number of pumps,valves,drilling machinery, transport equipment, lifting equipment, pipelines, their life is an important factor affecting the wear and corrosion.Multifunction supersonic HVOF coating to strengthen and repair the pump piston rod has a good application effect, piston rod spraying WC coating after strengthening, wear resistance is greatly improved and the service life is increased several times. In the field of petroleum machinery, wear seat and shaft parts is also more serious. Because of the Co based WC coating prepared by multifunction supersonic flame spraying, low residual stress,the thickness of the coating can reach 3mm or more thick,and the coating and the substrate the combination of good in wear under heavy load, the dimensions of recovery has a good application.

Pump,cylinder,valve is composed of the basic unit of hydraulic and pneumatic systems, corrosion wear and medium is the key factor of restricting its life. Using the multifunction supersonic HVOF coating technology of pump shaft, piston rod, valve for strengthening and repairing, these parts require higher accuracy and surface finish. Multifunction supersonic flame spraying layer after the grinding precision and surface finish are very high, can meet the requirements.

Hard seal ball valve is widely used in industry,it relies on the seal between the valve core and valve seat to control fluid off, because does not require the use of non-metallic sealing materials, has the advantages of compact structure,reliable sealing,corrosion resistance and strong features,it is widely used in chemical industry. The wear and corrosion resistance of metal ceramic coating prepared by a certain the thickness of the spool and hard seal ball valve, and grinding to the required precision and smoothness, can greatly improve the sealing performance and service life. Wenzhou Chengda special valve factory using multifunction supersonic flame spraying technology to strengthen the hard seal ball valve, greatly improve the performance and the service life of the valve, and can meet the needs of oil chemical industry special conditions, praised by users.

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About the cooling rate of cryogenic treatment, generally put the mold into liquid nitrogen cooling. According to foreign reports, the use of slow cooling is better than direct liquid nitrogen. Some experiments show that the cooling rate will affect the organizational transformation of cryogenic treatment, the better way is to use a program controlled temperature control box to control the cooling rate.

The orthogonal experiment was used to study the cryogenic treatment of cemented carbide YT15. It was found that the cryogenic temperature had the greatest influence on the performance of the die and mold, followed by the cooling rate.Steel bonded hard alloy after quenching and tempering of the organization are very different,after quenching structure of the steel bonded hard alloy has a lot of residual austenite,martensite is over saturated; as fully austenitic tempering, usually below 1% residues after tempering, and after tempering after hardening, martensite alloy greatly reduced; residual austenite the volume of martensite and alloy of martensitic precipitated from austenite and carbide has great influence on residual after cryogenic treatment of steel bonded cemented carbide,influence the effect of cryogenic treatment.

Many reports about the effect of Tempering on hardness and lifetime of hard alloy after cryogenic treatment, mainly concentrated in the cryogenic treatment after tempering time, a short time is that one is that insulation can be hard alloy materials long time better insulation effect. According to the different time of cryogenic, cryogenic treatment of YG20 cemented carbide hardness are improved to varying degrees, the short time of 2 ~ 4H to reach the peak, Vivtorinox 1689HV30 and 1666HV30 respectively to the hardness values from the 1610HV30 prior to treatment, increased respectively 4.91% and 3.48%.

Cryogenic treatment technology to improve the performance of cemented carbide.Cryogenic treatment can significantly improve the hard alloy wear resistance and long service life,it has been a consensus, but the cryogenic treatment on residual mechanical properties of hard alloy should impact stress there are different views, many studies suggest that the residual stress in the surface strengthening is the main reason of crystal structure transformation and Co high temperature stress; quenching also has great effect on improving the performance of cemented carbide, the interaction between heat treatment and cryogenic treatment are few researchers involved. It is still in the initial stage of industrialization and application of cryogenic treatment of cemented carbide tools. Therefore, in view of the hard alloy types and composition of diversity and complexity, and cryogenic treatment on P, K, M of different grades of cemented carbide was optimized to improve the performance of cemented carbide,there is no technological specification of hard alloy cryogenic technology, development of cryogenic equipment must be advanced, in-depth exploration of the mechanism of cryogenic treatment that is the direction of research and development. It can be concluded that the deep cryogenic technology of cemented carbide has a very broad prospect for improving the technical level of China's mold industry and the comprehensive competitiveness of the manufacturing industry.

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Thermal spraying has been widely used in the oil industry, has been successfully used in oil exploration,mining and other equipment repair and protection.which has been successfully used for petroleum pipe thermal spraying, anticorrosive technology of offshore platform. The introduction of arc in Shengli oilfield downhole engineering installation company spraying, solve the problem of metal corrosion,fill the corrosion of metal. Blank oil oil used in all kinds of pump piston, cylinder, impeller and other parts can be used to repair and strengthen a variety of thermal spraying methods. Using oil tower, tank, pipe can be arc spraying aluminum,zinc, stainless steel coating or by flame spray corrosion in Huangdao and Qinhuangdao oil depot.The company's first stop outside the tank surface using this kind of thermal spraying technology. By plasma spraying, flame spraying, arc spraying can be solved by various oil boiler pipeline corrosion and erosion America. Texas and Luis Anna oil derrick, sea oil spray zinc, plus two vinyl aluminum paint sprayed aluminum and aluminum paint 0.16mm, ethylene, after 25 years after the inspection, the coating is good. The British Beihai drilling platform by spraying aluminum coating and sealing technology, long-term operation of anti-corrosion effect is good.

In recent years, with the great progress of thermal spraying technology and the rapid development of nanotechnology, the combination of thermal spraying is becoming an important field of thermal spraying technology development of nanostructured coatings. At present, the use of Thermal Sprayed Nanostructured Coatings prepared mainly by 2 ways: (1) the preparation of macro coating nano features. Nanoparticles is relatively less content into traditional coating, the coating becomes the nano particle dispersion strengthening, has certain characteristics of the nano composite coating; (2) coating preparation completely composed of nano particles, gives the engineering performance of coating with excellent. The composite powder AT13 powder doped with nanometer particles Al2O3 13wt%TiO2 of plasma spraying and its application in gas well tubing in the experiment. The experimental results show that the performance of tile powder doped nanometer particle, coating uniformity. High; nano particles made the coating residual stress decreases; coating microstructure than the conventional coating doped nano particles in similar conditions, the hardness, lower friction coefficient and wear resistance increased by more than 30%, which makes the oil pipe corrosion resistance is improved by nearly 1 times.

In solving the problem of petroleum and natural gas industries in corrosion and wear problems of various types of technology, thermal spraying technology has been proved to be a very effective and successful technique used in natural gas pipeline has also made some achievements, and accumulated experience, laid a good technical foundation for its further application. But the current domestic thermal spraying technology has a large gap compared with foreign countries, the application of process stability is not high, the low level of professional operators, equipment shortage, development ability is weak, the porosity of the coating is high, poor performance and compatibility issues closed paint and so on.To solve these problems,and take the following measures:

1. according to the national advocacy of knowledge innovation and the upgrading of industrial policy, carried out joint research, development of new thermal spraying technology, nano coatings and other new technology, and the establishment of test results, pilot scale and Industry Application of one-stop product innovation and development system;

2. a complete development and supporting technology system, including pretreatment,coating materials, thermal spraying coating and sealing, operator training, the establishment of professional technical support and service team construction;

3. the concepts and methods of engineering equipment life cycle cost assessment based on the oil and gas industry and promotion, in order to truly reflect and realize the thermal spraying technology cost advantage, and promote its natural gas pipeline in the comprehensive promotion and application.

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The correct choice of coating material is the key to ensure the work required for the properties of the coating. The coating materials selection, should first consider the working conditions and performance of workpiece coating required,but also consider the workpiece material, batch, economy and intends to adopt the method of thermal spraying coating.According to the function of the coating can be divided into corrosion resistant coating, abrasion resistant coatings, friction reducing and sealing coating, high temperature resistant thermal barrier coatings, insulation or conductive coating, the size of repair coating.

The surface of the workpiece after coating in the rejection caused by failure reason is often not a single factor, so can meet the requirements of working conditions and performance of the coating does not necessarily exist simple relationship should be analyzed in detail. According to the working conditions, and reference and experimental data on the coating structure, physical, chemical, mechanical and other comprehensive performance consider, in order to determine one or several kinds of coating materials.

Wear resistant coating is one of the main fields of the application of surface coating technology. Although there is a general relation between the hardness and wear resistance, hardness and wear resistance but not entirely representative of the surface coating. Because of the different types of wear properties of material is not the same, and in the wear and often accompanied by shock, corrosion influence of fatigue, and temperature.

The choice of surface coating materials can not blindly pursue high performance or high price of the coating material, resulting in unnecessary waste of material price can not be used as coating materials selection criteria, phase reaction prerequisite to meet the requirements of working conditions under the coating material as far as possible with low price, is particularly important in mass production for example, can use the material of Ni based alloy coating without cobalt base alloy coating materials.

In the selection of surface coating materials, the following steps can generally be carried out:

(1) analyze the working condition and the performance of the parts, understand the reason of failure and the requirement of the coating performance;

(2) lists the available coating materials;

(3) analysis of the compatibility between the selected material and the substrate material and the thermal spraying method;

(4) conducting laboratory or field tests if necessary;

(5) considering the service life, cost and factory conditions, determine the coating material;

(6) determine the surface coating method and develop the coating process

The following is a brief introduction of the commonly used coating performance, for the correct selection of spraying technology to provide reference

Generally speaking, the main purpose of using thermal spraying coating are the following: (1) corrosion resistant coating; wear resistant coating; (2) (3) and antifriction sealing coating; (4) high temperature resistant thermal barrier coating; (5) insulation or conductive coating; (6) the size of different repair coating and so on. The purpose of using different coatings.

Thermal sprayed coatings can also be used as electric conductors,such as printed circuit and the heating element. The contact thermal spray coating oxide and organic plastics can be used as an electrical insulator. The electrical properties of matrix material by spraying materials. Effects of spraying materials should generally be selected according to the known properties of the material and its use.

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