December 29, 2017
December 28, 2017
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
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:
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.
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
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
December 08, 2017
December 07, 2017
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.
December 01, 2017
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.
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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