December 29, 2017

Tungsten carbide saw tips

Tungsten carbide saw tips is used as the raw material of hard alloy. It is usually used to weld the saw blade to enhance the strength of the tool while extending its service life and has wide application. Hard alloy material has the characteristics of high hardness and high wear resistance, thus carbide blade in the process of tool also shows high toughness and greatly prolong the working life of the cutting tool processing, compared with other materials of the saw tooth favored by more users.

Carbide blade high wear-resisting performance, users in the use process often need to change, and the cutting tool on the equipment when high speed machining is not easy to loose, which greatly improves the cutting tool machining efficiency and quality. In addition, according to the different application environment, the hard alloy blade can be made of different hard alloy plate number. The international brand is mainly used in the number of K10 to K30. Some users can apply the coating of other materials on the saw tooth surface to enhance the hardness of hard alloy, and can greatly enhance the strength of the saw tooth in some way.

Hard alloy serrated is used to prolong the service life of the cutter, but some users do not recommend hard alloy as the piece material of the saw blade. The main reason is the cost, although the hard alloy products have high cost performance. In addition, hard alloy materials are more fragile than other materials such as steel. So they consider adopting steel for saw blade body, so the blade is not easy to break or split phenomenon in the process of machining, and better performance of hard alloy blade, the blade has greatly increased the efficiency. According to relevant data, the processing edge of hard alloy sawtooth can grow to 10~20 times than that of steel.
Maintenance and maintenance of tungsten carbide saw tips
Grinding in time is very important, because the passivation of tungsten carbide saw tips edge at work, because the resistance increases, easy cause blade jitter, increases the motor load at the same time, the saw blade and the machine will cause damage. Continue cutting at the time of grinding, with each additional 10% of the cutting, will bring an additional 50% of the alloy damage and shorten the service life of the saw blade. Must be regularly remove gathered in the resin on the side of the sawtooth, debris and other sundry, because of the steady accumulation of gelling material, will increase the resistance, causing energy-intensive (extreme cases, can cause the machine motor burning) and rough cutting quality. If the blade is blunt at the same time, it is possible to cause sawtooth damage. When stored, should be placed separately, not superimposed and placed on metal objects, preferably in the original carton, so that it can be moved and removed.
Repair for tungsten carbide saw tips
With sophisticated, stable and no vibration grinding machine blade, and suitable diamond grinding wheel, in accordance with the prescribed procedures to repair in head of gold, will extend the service life of saw blade, please do not use manual grinding equipment. Before grinding, you must wash away the resin, debris and other sundries that are glued to the saw blade.

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December 28, 2017

Carbide cutting tools output increased sharply in Japan

It is understood that in September 2017, the total output value of Japanese knives is about 34.143 billion yen, which is an increase of 8.4% from 315.04 billion yen in August, compared with 32.596 billion yen in the same period in 2016.


In addition, in the third quarter of 2017, the total number of Japanese carbide cutter output was about 99378 million yen, a 3.8% increase from the previous month, with the carbide cutting tool of 67.959 billion yen and 19.5%. High-speed steel tools were 218.88 billion yen and 28.2 percent less. Diamond cutter 28.8.3 billion yen and 12.2%; The cubic boron cutter was 6648 million yen,up 15%.


In September, the output value of Japan's carbide cutting tool was 23.271 billion yen, up 1.08% from the previous month and 20% year-on-year. The production value of high-speed steel tools was 75.79 billion yuan, up 9.1% from the previous year and 26.6% year on year. Diamond tool output is 10.07 billion yen, up 14% from the previous year and 10.3% year on year. Cubic boron cutter is worth 22.86 billion yen. Growth was 11.7 per cent quarter-on-quarter and 16.4 per cent year-on-year.


In the first nine months of 2017, the total number of Japanese bladeproduction was about 295.31 billion yen, up 0.2% year on year. Among them, the accumulative total of hard alloy knives is 14.5 billion yen and 14.5%. High-speed steel cutter 66.28 billion yen and 28.5%; Diamond cutter 8435 million yen and 6.7%; Cubic boron cutter was 19348 million yen and 5.3 %. It appears that the high speed steel cutter is a significant drag on the growth of the entire tool industry.


High speed steel cutter is a kind of toughness than ordinary knives, easier to carbide cutting tool, used to drill, tap, saw blade and hob, pinion cutter, broach and other precision cutting tools, especially suitable for manufacturing complex thin blade and impact resistance of metal cutting tools. In 1923, the emergence of the carbide makes the cutting speed increased to more than one hundred meters to hundreds of meters per minute, and its hardness is higher, which can be processed by high speed steel cutting materials, and with the constant improvement in recent years, the performance of cemented carbide, carbide cutting toolsgradually eroded the market share of high speed steel tools. Then there are more advanced cutting tools, such as ceramics, cubic boron and synthetic diamond, and they are more rigid and resistant than hard alloys.


High speed steel tools have excellent strength and toughness, while tungsten carbidecutting tools are superior in hardness and red hardness (the ability to maintain hardness under the cutting temperature). Generally, the cutting speed of the solid carbide tool can reach at least four times the cutting speed of the high speed steel cutter, and the tool life is longer. However, compared with high speed steel tools, the fracture toughness of hard alloy cutter is poor, which limits its application in certain machining areas, especially tapping.

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December 22, 2017

Tungsten Carbide Bearings with wear prevention and corrosion resistance

Carbon and graphite compounds are used for standard bearings, which have excellent corrosion resistance when working in most liquid environments.

Some liquid containing solid abrasives will hinder the binder or process and affect the use of graphite bearings. Alternative materials in this case, such as:

silicon carbide

Carbon graphite


Cemented carbide bearings

A cemented bearing is a bearing made from a hard alloy. Tungsten carbide bearing has the characteristics of super high wear resistance and high impact resistance. The surface and inner hole of the cemented carbide bearing can achieve the mirror effect.

Carbon graphite bearing

Carbon graphite is a kind of graphite bearing material with high temperature resistance and certain self lubricating function. Its most significant advantages are high temperature stability and strong chemical corrosion resistance. In the early stage of development of graphite bearing, especially in strong corrosive medium or high temperature environment, carbon graphite has been used as bearing material and has been applied to some extent. With the progress of the powder metallurgy industry and the maturity of the impregnation process, the new impregnated graphite bearing has gradually replaced carbon graphite with its excellent properties.

Although the pure carbon graphite corrosion resistance and high temperature resistance is relatively high, but as bearing materials, flexural strength, compressive strength and its impact performance is poor, this is mainly due to its relatively large porosity (about 10% ~20%), and these are not impregnated filling holes, there is no play the reinforcing effect. But in some special occasions, the working medium is strongly corrosive, or because of the size of the structure, it is impossible to set up the heat shield without shielding the load.

Silicon carbide bearing

Carborundum belongs to ceramics, and most of the general ceramics now refer to ceramics other than carbon. Such ceramics are mainly Si3N4 and SiC, and their hardness is very high. The hardness of the SiO2, whose composition is mainly composed of sediment (HV800~1 000), is higher. Therefore, it has strong adaptability to impurities. The disadvantage is that the impact resistance is poor, but the measures can be taken to a certain extent according to the bearing structure.

Imported silicon carbide has been applied in many fields because of its high hardness, high temperature creep, high wear resistance, corrosion resistance and oxidation resistance. Silicon carbide can be divided into three kinds, such as high pressure sintering, pressure free sintering and reaction sintering, according to the different sintering methods. At present, the pressure free silicon carbide (SIC) has been widely used in shielded motor because of its high wear resistance and low friction coefficient. Under the condition of water lubrication, silicon carbide can produce a film of silicon dioxide and silica gel on the surface to further reduce the friction coefficient. The silicon carbide itself has the function of self lubrication, which is suitable for the material of friction. However, because of the high hardness of silicon carbide, the impact toughness is relatively low, and the fracture toughness of SiC without pressure sintering is only about 3~4MPa. M1/2. It is not suitable for the shock vibration condition, the silicon carbide as bearing material used in motor, in addition to the selection of spraying surface (or welding) of tungsten carbide grinding parts as friction pair, but also for special design in structure, set up special measures should be to force groove, to prevent silicon carbide by the impact have broken. At the same time, when silicon carbide is used as a bearing material to shield motors, the conveying medium must be clean and free of impurities, and requires stable operation and no vibration. Therefore, silicon carbide as a bearing material has greatly improved the friction life of tungsten carbide bearings. However, under the condition of high reliability, especially the shielded motor used for military and nuclear power, there are few uses of silicon carbide as bearing material, and the reliability needs further study.

Alumina bearing

This material is very similar to silicon carbide in abrasion resistance and corrosion resistance. However, it is also easily affected by the temperature adjustment and the impact of the operation of the machine.

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December 20, 2017

Research status of hot sprayed wear-resistant coating technology

Hot spraying ceramic powders include oxide, carbide, boron, nitride and silicide, which are crystalline or non-crystalline compounds of metallic elements and non-metallic elements. Ceramic coating has the characteristics of high melting point, high hardness and good wear resistance, corrosion resistance and high temperature stability. However, the coating process is complex, the cost is higher, and the coating surface is prone to crack, the thermal fatigue performance is not as good as the metal coating. Moreover, the coating has poor toughness and can not be used to withstand large impact load. Currently, the commonly used ceramic coatings are A12O3, TiO2, Cr2O3, ZrO2, WC, TiC, Cr3C2, TiB2, etc., which are usually prepared by plasma spraying, flame spraying, HVOF and explosive spraying technology.

Plasma spraying A12O3-40% TiO2 and Cr2O3 sliding friction and wear properties of ceramics powder coating is pointed out that the wear resistance of coating Cr2O3 higher than A12O3-40% TiO2 coating, the wear mechanism of Cr2O3 coating are mainly abrasive wear and tear, under the large load, Cr2O3 coating wear characteristics of brittle fracture. The abrasion mechanism of a12o3-40% TiO2 coating is mainly characterized by plastic deformation and laminar stripping. Study of A12O3 plus TiO2 and NiCrAlY composite ceramic coatings, due to the melting of TiO2 and A12O3 formed a certain degree of miscibility, can decrease the coating porosity, further improve the strength, toughness and wear resistance of the coating.

Lin et al. studied the wear and tear characteristics of plasma spraying multi-layer metal and ceramic coating. The thermal spraying sequence was first sprayed on the base with NiCr on the bottom layer, then the nicr-cr2o3 transition layer of different proportions, with a surface of 100% Cr2O3. It is found that the transition layer of suitable metal and ceramic ratio can improve the wear resistance of the coating. The main wear mechanism of coating is brittle fracture, abrasive wear, adhesion and oxidation wear.

Metal and the excellent properties of ceramic materials have their unique and significant performance weakness, how to put the metal and ceramic materials combine their advantages performance, has been the direction of materials science and engineering research. Metal ceramic composite hot spraycoating technology, namely in the plastic substrate evenly distributed on the particle shape and size of the appropriate size ceramic phase, successfully integrate the advantages of metal and ceramic, the preparation of both strength and toughness, metal and ceramic advantages of high temperature resistance, wear resistance, corrosion resistance of composite materials, greatly expanded metal materials and ceramic materials, their application scope, in aviation, aerospace, chemical, mechanical, electrical and other industrial applications successfully. The most widely used metal ceramic coatings in industry are: Cr3C2- NiCr, WC- Co. HVOF, plasma and explosive spray are used in the process.

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December 13, 2017

Particle size classification of WC powder and its industrial application

Tungsten carbide powder (WC) is the main raw material, the production of cemented carbide with tungsten metal powder and carbon black as raw material, the mixture in a certain proportion, the mixture into graphite boat, placed on a carbon tube furnace or high sense of intermediate frequency electric furnace, carbonized under a certain temperature, then through the ball mill, screening for a quick tungsten carbide powder.
The tungsten carbide powder is a dark grey powder which can dissolve in many kinds of carbides, especially in the carbonized titanium, which forms the TiC-WC solid melt.
Tungsten carbide powder is used to produce hard alloy.
Packaging for WC powder
Generally use inside plastic bag seal, outer iron bucket package, net weight of no more than 50kg.
Inspection standard
According to gb4324-84, the analysis method of the chemical composition of the chemical composition of the chemical composition of tungsten carbide powder was carried out in accordance with gb4324-84. The average particle size was carried out in gb3249-82, and the sampling method was carried out in accordance with gb5314-85, and the main content (WC) was calculated by differential subtractive method.
The first tungsten powder was produced by chemical purity. Japan has formulated the industrial standard for tungsten powder and WC powder (jish2116-1979). Britain, France and the former Soviet union have unified national standards for tungsten powder. The technical conditions for hydrogen reduction tungsten powder was formulated in 1982 by the tungsten powder of Chinese industrial production (gb3458-82). The standard defines the performance and classification of the tungsten powder. And the inspection methods, acceptance rules, packaging, transportation and storage have been clearly defined. For special use and for the special purpose of the tungsten powder, the production plant can be produced according to the requirements of the user.
Industrial Application
Tungsten powder is the main raw material for processing powder metallurgy tungsten products and tungsten alloys. Pure tungsten powder can be made into silk, rod, tube, plate and other processing materials and certain shape products. Tungsten powder mixed with other metal powders can be made into various tungsten alloys, such as tungsten molybdenum alloys, tungsten rhenium alloys, tungsten-copper alloys and high-density tungsten alloys. Another important application of tungsten powder is to make tungsten carbide powder, which can be used to prepare cemented carbide tools such as tool, milling cutter, bit and mould.
Tungsten products
Particle size classification of WC powder
Tungsten powder quality directly determines the quality of tungsten carbide (WC) and alloy properties, tungsten powder grading can effectively change the performance of the powder, solve the problem of coarse clip to fine powder, reduce the minimum size and maximum diameter and average particle size difference degree, to produce more crude and more uniform tungsten carbide powder; Due to the characteristics of tungsten, it is not easy to be broken. In the pre-grading, the particles should be broken in a proper way, and the granules of the powder can be separated, and the powder can be separated more effectively and the uniformity can be improved. According to the characteristics of the original powder, it is necessary to find the best operation process.

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December 08, 2017

Guided T-A deep-hole drill to replace solid carbide burs

Drilling deep hole is not only the "unique skill" of gun drill and integral solid carbide burs. As early as 15 years ago, the united machinery and engineering corporation (AMEC) began making its Guided t-a bit (to perfect its t-a drilling system) and used it for gun drilling. The Guided T-A bit is A customized tool designed for customers' specific processing needs, which can process long diameters of 5, 10, 28 or larger. It consists of a high strength steel blade and precision grinding of cutter holder on the form, the knife can be clamped on the company's standard series of cemented carbide and high speed steel blade, the processing aperture range of 9.5-115 - mm (can be customized size). The drill can be used for milling machine or lathe.
In addition, the design of the Guided t-a bit enables it to overcome the difficulties which may result in the failure of the solid carbide burs. Miller added, "the solid carbide drill bit is not suitable for intermittent cutting, such as drilling cross-hole or exporting holes in the surface or inclined plane. Usually, in the case of these machining situations, the hard alloy bits have a large force on one side, so it is easy to cause the drill to deviate from the center line or fracture. The Guided T-A bit has A supporting area behind the flat drill at the front, and the supporting area always keeps in contact with the hole being processed and does not allow the bit to deflect. AMEC company advised, the user can use A first length is relatively short (1-2 times the diameter) of pilot drill processing guide hole, its aperture and Guided T - A bit diameter is the same, this helps to reduce the bit offset and oscillation process.
Three years ago, Smith International Inc., A supplier of U.S. oil and natural gas, tried using A Guided t-a bit to finish the process of drilling in high-speed steel. Processing tasks included in 4140 on the steel tube heat treatment (hardness HRC30-32) at 30 degrees oblique hole drilling depth is 355 mm. According to Ray Stafford, a processing manager at the company, it takes about five hours for each hole to be used by workers before they are drilled through a high-speed steel drill. "We first work out a guide hole with a fixed core drill, then use a high speed steel extension taper shank drill to get to the drill hole, and then use the drill to drill through the hole. Therefore, we hope to have a bit that can improve the processing speed."
The Smith company asked AMEC to make A Guided t-a drill with A diameter of 44.45mm and A length of 355mm. "We got a bit of the required specification," Stafford said. "it worked very well after it was put into use." The deep hole is processed from beginning to end using only one drill. The processing time of each hole is only 1 hour and 15 minutes. In addition, once used to drill the drill, every three holes must be resharpened. The Guided T-A drill can process 9 holes before it has to replace the high speed steel blades. Now, the company has found that it can also be used in more processing situations.

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December 07, 2017

Some discussions on the wire drawing process

The surface wire drawing process is usually the manual drawing and mechanical drawing.

As , hand-drawn wire is generally aimed at small workpieces, which have a certain shape of workpiece, and the grinding products used are usually industrial baijie. This kind of wire drawing method has low production efficiency, the line effect is unstable, so it is not mainstream in industrial production, the mainstream is mechanical drawing.

The advantages of mechanical drawing are fast, high degree of automation, and stable and controllable drawing effect. Mechanical drawing is mainly divided into flat - pressed abrasive belt drawing, wire - contact abrasive belt drawing, non-woven roller drawing.

First of all, we introduce the flat - pressed sand strip. The workpiece on the fixture, start the sand machine, abrasive belt high-speed rotation, and then, on the back of abrasive belt with a controlled, can be up and down, left and right sides of mobile press block, but briquetting press, abrasive belt can stick take in wire drawing workpiece surfaces. This kind of mechanical drawing method is a flat wire drawing, which can not have any convex point on the surface of the drawing. It is characterized by a continuous line pattern, long.

Wire contact sand drawing is a traditional drawing method. In different places, the surface of the contact surface of the sand belt is accomplished through the contact wheel instead of the specially designed pressure block. So the workpiece is in contact with the sand, point, line contact, not surface contact. So, even with the same sand belt, there is a distinct difference between line contact and surface contact method.

In addition to the two kinds of mechanical methods used in the use of abrasive belt, there are also non-woven roller wire drawing process. As I said, the non-woven material is also a good material for drawing. Non-woven material is elastic and has a special three-dimensional network structure, so it is commonly used as a wheel. Since the elastic ratio of non-woven material is better than sand belt, it has better surface fitting and is suitable for machining some curved parts. In addition, since the non-woven roller and workpiece are line contact, the surface contact of the peaceful pressure type abrasive belt drawing is less heat and is cold machining.

The above three types are commonly used in industrial production. In practical application, according to the different shape of the workpiece, the different line, and centerless grinding wiredrawing, static drawing several ways, such as but as a result of application is not wide, does not make the detailed discussion here.

To sum up, wire drawing process is a complicated and complicated process. It's difficult is not whether can pull wire lines, but in the case of the customer designated line effect, how to use the hands of the grinding materials, machinery and equipment, how to set the grinding parameters, etc., to pull out the high similarity of lines. Therefore, if you want to satisfy your customers, you should pay more attention to the new types of grinding products in the market, besides the type and performance of the machine.

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December 01, 2017

Introduction of the manufacturing process of carbide blades

A typical machining shop may consume thousands of cutting inserts per year. An operating worker may use many cutting inserts daily, but never think about the complex scientific knowledge behind the inserts. c, for the proper use of tools and performance optimization will be of great benefit.


Composition of Carbide blades

As with all man-made products, manufacturing cutting inserts first addresses the raw material problem of determining the composition and formulation of the insert material. Most of today's blades are made of cemented carbide, whose main components are tungsten carbide (WC) and cobalt (Co). WC is a hard particle in the blade, while Co acts as a bond to shape the insert.


Carbide cutting blades performance applications:

Carbide cutting blades, carbide blades, which is a powerful modern manufacturing equipment processing equipment, carbide cutting blades, carbide cutting tools with its excellent performance as a super-hard cutting tool in the most competitive products, as a Carbide cutting tool, it is a wealth weapon, widely used in manufacturing now. China xiamen Tungsten Technology Co., Ltd., tungsten carbide professional manufacturer, to provide all kinds of carbide cutting blades, carbide shaped custom-made tools customized service.


Carbide cutting blade Product features:

Our company has a complete industrial chain of cemented carbide, carbide production technology for many years based on, combined with rich experience and production and processing equipment to market-oriented customer demand-oriented, in order to achieve and meet the customer value for the goal, there is a Customers need to provide custom carbide cutting blades customized services to customer drawings or sample data as a reference to the specific requirements for the purpose and dedication to meet the customer's use of carbide cutting blades. My company in accordance with customer requirements produced by carbide cutting blades to ultra-fine particles of high-quality tungsten carbide raw materials for the substrate, after high-precision processing equipment refined, with good toughness and service life.


development trends

According to the needs of the development of the manufacturing industry, multi-function compound knives, high-speed and efficient knives will become the mainstream tool development. In the face of the increasing number of difficult-to-machine materials, the tooling industry must improve the tooling materials, develop new tooling materials and more rational tooling structures.




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