April 28, 2017

more economical to use diamond grinding wheel to grind tungsten carbide inserts

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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April 27, 2017

Comparison of advantages and disadvantages for wire drawing dies materials

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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April 26, 2017

The base material of carbide end mills is selected with high toughness

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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The base material of carbide end mills is selected with high toughness

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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April 25, 2017

Cemented carbide cutting tool becomes a sharp tool for high speed machining

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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April 24, 2017

Application of multi function supersonic HVOF coating technology

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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April 21, 2017

Effect of cryogenic treatment on the properties of cemented carbide

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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April 20, 2017

Thermal spraying technology has been proved to be a very effective way

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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April 13, 2017

Thermal spraying material selection guide

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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April 12, 2017

The British opening or weaken the dominant position of the new Chinese tungsten carbide powder

According to foreign media reports, one of the reasons is located in southwest England Devon Homerden project began to cause attention, this is the first New England 45 years enabled, but the more important reason is that it will produce tungsten, that is to say it will provide sufficient sources of tungsten to tungsten carbide powder production.Or will weaken the Chinese domination of the tungsten carbide powder.

 

Two years ago, the British geological survey evaluation study on tungsten supply risk level highlights the importance of tungsten, at the highest risk level is 10, Institute of geological survey score of 9.5, with the same rare risk level, because these two kinds of resources production and consumption were China led, can Chinese decided to supply other countries. In order to improve the situation of tungsten carbide powder resources to speed up the British defect research and development of mineral products, and the discovery of new mines cleared the financial barriers, provide adequate sources of tungsten to tungsten carbide powder production, from the economic point of view, new mines will bring in huge profits.

 

Mainly used in the production of tungsten carbide. Widely used in metal cutting tools, mining and geological drill insert, tensile stamping die,wear resistant and corrosion resistant parts. Tungsten carbide and tungsten carbide powder,which are made by melting casting tungsten carbide alloy. For surfacing wear resistance of parts or products, can prolong the service life. Tungsten alloy used in the manufacture of high-speed drill, wear, cutting tools and machinery in the anti strike, structure corrosion resistant material. The high proportion alloy made of iron nickel copper manganese tungsten containing high, to balance the system and weight system of the aircraft, the rotor inertial rotation element and gyro instrument system, and medical and chemical radioactive isotope (Co 60) of the container. The other tungsten compound used in paint, paint, rubber, textile, petroleum, chemical industry and so on. The use of tungsten is still expanding, such as: high temperature in metallurgy The coating for the oxidation; the aerospace industry as a rocket nozzle, nozzle, heat exchanger dissociation ion rocket engine; used as a container of liquid metal tungsten thermionic nuclear engineering, switches and so on.

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April 11, 2017

demand for cemented carbide cutting tool remains a world leader in Asia

According to statistics, the future in the tool industry, proportion of cemented carbide tool will gradually increase, and the ratio of products of high speed steel tools will be gradually reduced. The Association believes that Chinese has become the world's largest machine tool consumer, followed by Japan, the United States, Italy and so on.

Asia's rapid economic growth, in good economic environment, the Japanese metal processing industry in recent years has continued high growth, output from carbide cutting tool, hard alloy cutting production in recent years of sustained growth, and high speed steel tools began to decrease, hard alloy import and export volume was significantly increased, the main exports to Asia, followed by then to Europe, North America and other regions.

Chinese cemented carbide cutting tool market is rare, it really can be called the "globalization" of the market. Don't say the industry is famous, the tool has a certain scale has been fully in Chinese offices or looking for agents to sell, even only two,thirty employees of the German small company also put the tool sold to the Chinese, everywhere on the market from Germany, Japan, the tool products the United States and other countries.

"The market of China cemented carbide industry concentration is not high, the threshold which mainly comes from the cutting tool industry itself is not high, many small businesses set up several lathes to start production,while in the whole industry, the low-end market products were in short supply, but also objectively accelerated the industry diversification".

According to reports, changes in the industry this year, many low-end business days began to become uncomfortable. But overall, the tool is consumable, even without a new machine production line needs a new tool, the old machine tool also needs the characteristics of products, this year is the consumption of inventory in a large area.

China's tool industry sustained rapid growth, behind the rapid development, enterprises are keenly aware that cemented carbide tool industry high growth rate of gold content is not high, of which a considerable number of enterprises at the expense of the environment, based on cheap labor cost, the production of inferior products to obtain huge profits.

In recent years, a number of high-end technology development of China's manufacturing industry has brought new requirements to the tool.Such as automotive tools must possess the characteristics of high stability and high efficiency,specialization,and with the continuous development of the automobile industry forward, new requirements have emerged,from a technical point of view,there are heavy,complex,special,standardization,high speed and diversification trend. In the aerospace manufacturing field, with the wide application of titanium alloy, high temperature alloy difficult to cut materials, how to choose the correct and reasonable use of tools for high quality cutting has become a very important topic in the industry.

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April 10, 2017

Processing method of wire drawing dies

Straight line structure of the processing of the best choice of wire drawing diesgrinding machine to process, if the use of other forms of grinding machine is relatively poor. This is because:

(1) its grinding is a straight line grinding, which is the most fundamental difference between it and the old grinding machine, and the old grinding machine is the use of imitation form grinding;

(2) it is a kind of machining method, which completely solves the influence of human factors caused by manual grinding;

(3) die angle, radial adjustment is using the indicator to achieve, solved by experience, feel the whole grinding mode, grinding process is more reasonable and accurate.

The working principle of the horizontal milling molding machine is: when the mold is clamped on the head rotating at high speed (1000 ~ 5000r/min), in order to reverse rotation grinding high speed (10000 ~ 40000r/min), and the grinding angle by the reciprocating straight-line motion for grinding of the die hole.

The angle of grinding and grinding molding machine on angle is selected, set according to the die hole angle of wire drawing dies, each part of the die hole diameter is through the radial distance adjusting grinding to achieve. The grinding method, regardless of the shape of the surface of the die hole, the die wall surface of each point can be very evenly throughout the cone grinding, and grinding of the cone can be uniformly grinding to the mold wall on each point, so the grinding cone can be uniformly grinding to die on the wall of each point, so you can make sure the profile die hole is composed of several lines, each line is at the intersection of minimal arc angle and grinding cone is a straight cone, and will not change the original grinding angle. In the 4 regional grinding mold, according to different requirements (such as angle and diameter), radial adjusting grinding feed rate, die hole center line and the center line of the grinding angle and grinding feed, so that you can complete the whole process of mould processing.

Another reason for the mold before the size of each part is not standardized, only the regional parameters are specified, and did not make detailed provisions on how these parameters such as diameter of road, with the length of the how to meet the prescribed requirements, the operator is to grasp their own experience. Therefore, it is necessary to have a complete, systematic and practical operation process of grinding die. The pull wire process of wire drawing dies should be based on the specific circumstances are divided into high carbon and low carbon, dry and wet pull pull, large holes and small die hole, pickling free drawing and drawing, galvanized after pickling and galvanized, back cone,cone,entrance design work according to the specific requirements of the exit cone angle and sizing belt the length (including the parameters to achieve the sizing zone length is determined by the middle value of this parameter with analytic geometry calculation), prefabricated hole diameter.

Posted by: hannahgwendolyn at 09:31 AM | No Comments | Add Comment
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April 07, 2017

Tungsten carbide drill bits grinding and coating technology

According to the processing characteristics of the materials, has the following characteristics: drill bit hardness must be greater than the workpiece hardness;tusngten carbide drill bit under great torsion and axial force on the workpiece, therefore must have sufficient strength and toughness; because the processed material has good toughness, when the cutting blade is sharp enough to ask. Therefore the tool material must have sufficient wear resistance, so as to reduce the hardening of the workpiece; because the chemical properties must be high, so the requirement of tool material and titanium alloy affinity to poor, in order to avoid stroke diffusion caused by sticking to the knife and broken drill.

 

At present, there are many kinds of materials which are suitable for cutting tools, such as tool steel, hard alloy, super hard material and so on.

At first, try to use ordinary high-speed tungsten carbide drill coating test, ordinary high speed steel bit low price, when using coating technology, can significantly reduce the friction coefficient of the tool and the workpiece, improve the tool life. But because of the high speed machine tool, the drill bit breaking strength is not enough, cause in the process, the effect is not ideal.

 

Cemented carbide is the latest development of a cutting tool material,suitable for most of the rough material processing, including steel, cast iron, special materials and plastics

The main auxiliary plane of twist drill: the main auxiliary plane of twist drill is base plane,cutting plane, middle section and column section

If the auxiliary movement is not considered,the base surface of any point on the main cutting edge of the twist drill is changed.

The cutting plane at any point on the main cutting edge, is the point of cutting speed and cutting direction in the plane surface of the processing. The cutting plane and the vertical plane, and the main cutting edge of each point on the cutting plane are not the same. The column section at any point of the main cutting edge on the cylindrical surface by this point and to the bit center line to the center line and the column section,the main cutting edge on different radius of the cylindrical surface.

Select main geometric parameters of tungsten carbide drill bit.the main geometric parameters of drill bit selection including drill bit cutting edge angle, before and after angle selection, drill helix angle effect on the drill life analysis and edge processing.

The bit angle determine chip width and bit angle.When the diameter of carbide drill bit and certain amount of feed, increase the angle, then iron narrows, unit load on the cutting edge. Reduce angle have great impact on rake angle, the corresponding increase in angle to improve the cutting condition of a vertex. Influence of chip flow direction according to the relevant data. The tool design, combined with the processing of product hardness is not high, but the viscous characteristics, select the bit angle for 140 degrees.

 

Posted by: hannahgwendolyn at 09:04 AM | No Comments | Add Comment
Post contains 497 words, total size 3 kb.

Tungsten carbide drill bits grinding and coating technology

According to the processing characteristics of the materials, has the following characteristics: drill bit hardness must be greater than the workpiece hardness;tusngten carbide drill bit under great torsion and axial force on the workpiece, therefore must have sufficient strength and toughness; because the processed material has good toughness, when the cutting blade is sharp enough to ask. Therefore the tool material must have sufficient wear resistance, so as to reduce the hardening of the workpiece; because the chemical properties must be high, so the requirement of tool material and titanium alloy affinity to poor, in order to avoid stroke diffusion caused by sticking to the knife and broken drill.

 

At present, there are many kinds of materials which are suitable for cutting tools, such as tool steel, hard alloy, super hard material and so on.

At first, try to use ordinary high-speed tungsten carbide drill coating test, ordinary high speed steel bit low price, when using coating technology, can significantly reduce the friction coefficient of the tool and the workpiece, improve the tool life. But because of the high speed machine tool, the drill bit breaking strength is not enough, cause in the process, the effect is not ideal.

 

Cemented carbide is the latest development of a cutting tool material,suitable for most of the rough material processing, including steel, cast iron, special materials and plastics

The main auxiliary plane of twist drill: the main auxiliary plane of twist drill is base plane,cutting plane, middle section and column section

If the auxiliary movement is not considered,the base surface of any point on the main cutting edge of the twist drill is changed.

The cutting plane at any point on the main cutting edge, is the point of cutting speed and cutting direction in the plane surface of the processing. The cutting plane and the vertical plane, and the main cutting edge of each point on the cutting plane are not the same. The column section at any point of the main cutting edge on the cylindrical surface by this point and to the bit center line to the center line and the column section,the main cutting edge on different radius of the cylindrical surface.

Select main geometric parameters of tungsten carbide drill bit.the main geometric parameters of drill bit selection including drill bit cutting edge angle, before and after angle selection, drill helix angle effect on the drill life analysis and edge processing.

The bit angle determine chip width and bit angle.When the diameter of carbide drill bit and certain amount of feed, increase the angle, then iron narrows, unit load on the cutting edge. Reduce angle have great impact on rake angle, the corresponding increase in angle to improve the cutting condition of a vertex. Influence of chip flow direction according to the relevant data. The tool design, combined with the processing of product hardness is not high, but the viscous characteristics, select the bit angle for 140 degrees.

 

Posted by: hannahgwendolyn at 09:04 AM | No Comments | Add Comment
Post contains 497 words, total size 3 kb.

April 06, 2017

The new researches of the recent study on cemented carbide inserts

Carbide thread insertis widely applied during the turning processing operations, thread cutter turning machining operations to obtain good effect, feed method is very important.

Carbide insertthread cutter feed method commonly used turning processing operations

Radial feed: this is one of the most commonly used method, simple to use, high commonality; Long scrap steel workpiece chip produced by the v-shaped cause bending pressure ACTS on the cutting edge.

Processing requirements when cutting depth is small,cemented carbide insertsharp edge, the blade material toughness, good cutting heat, cutting produce V chip are harder to control.

Due to the left and the right of the chip contact length is long, easy to produce vibration point load increase.

Along the tooth profile feed: carbide blade cutting edge bending under pressure is small, the state is stable, into crumbs shape favourable, cutting depth is larger. Lateral cutting feed, there is enough space for scraps discharge between teeth. Right after the blade surface wear (cut deeply on only one side of zero).

Along the tooth profile improvement type feed: cutting edge on the right side was also involved in a certain degree of cutting depth, can reduce the right knife after the wear and tear. State of a cutting edge bending under pressure is small, relatively stable, into crumbs shape, cutting depth, cutting processing performance is good.

 

Alternate feed along the tooth profile

 

The cutting edges are used interchangeably,cutting edgeof carbide insertaround lientang surface wear uniform, can prolong tool life.

Chip out left and right direction, the better.

Recommend big pitch thread cutting use.

Carbide blade thread cutter turning processing, of course, to maximize efficiency as the ultimate purpose, shall be applicable to the specific method is right choice according to the relevant work requirements, to remind the broad masses of friends to correct selection of high quality method to improve production efficiency.

Posted by: hannahgwendolyn at 09:30 AM | No Comments | Add Comment
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April 01, 2017

The difference between cemented carbide and high temperature alloy

When makingcemented carbide, the size of the raw material powder is between 1 and 2 microns, and the purity is high. Raw materials according to the provisions of the proportion of added alcohol or other medium in the wet ball mill in wet grinding, making them fully mixing, crushing, drying, sieving after adding wax or gel forming agent of a class, and then drying and sieving to prepare a mixture. Then, when the mixture is granulated, pressed and heated to close to the melting point of the bonding metal (1300 to 1500 DEG C), the hardened phase and the bonding metal form a eutectic alloy. After cooling, the hardened phase is distributed in a mesh composed of bonded metal and is closely linked to each other to form a solid. The hardness of cemented carbide depends on the content of hardened phase and grain size, that is, the higher the hardening phase content, the finer the grain size, the greater the hardness. The toughness of cemented carbide is determined by the bonding metal, the higher the bonding metal content, the greater the bending strength.

 

In 1923, Germany to schrotter's tungsten carbide powder with 10% to 20% of the cobalt binder, the invention of the new alloy of tungsten carbide and cobalt, hardness only to diamond, this is one kind of hard alloy made of artificial world. When the cutting tool is made of this alloy, the cutting edge of the blade will soon wear off, and even the blade will crack. In 1929, Schwarz Kopf of the United States added a certain amount of tungsten carbide and titanium carbide into the original component,which improved the performance of cutting steel.This is another achievement in the history of cemented carbide.

 

Cemented carbide with high hardness, strength and toughness, good wear resistance, 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. Hard alloy is widely used as a tool material, such as turning, milling, planing, drilling, boring, used for cutting cast iron, non-ferrous metals, plastics, chemical fiber, graphite, glass, stone and steel, can also be used for cutting steel, stainless steel, high manganese steel, tool steel and other hard processing materials. Now, the cutting speed of the new carbide tool is equal to that of carbon steel.

 

It can also be used to make drilling tools, mining tools, drilling tools, measuring tools, wear-resistant parts, metal abrasives, cylinder liners, precision bearings, nozzles, etc..

Over the past twenty years,coatedcemented carbide has also come out.In 1969 Sweden developed titanium carbide cutting tool coating, the substrate is tungsten carbide titanium carbide cobalt alloy or cobalt tungsten carbide, titanium carbide surface coating thickness of only a few microns, but with the same grade alloy tool compared to prolong the service life of 3 times, the cutting speed increases from 25% to 50%. In 1970s, there have been fourth generation coating tools that can be used to cut materials that are difficult to machine.

Posted by: hannahgwendolyn at 09:20 AM | No Comments | Add Comment
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