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.
property
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.
Application
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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November 24, 2017

A solid carbide drills (CoroDrill 860) with the fastest cutting speed

We know that the carbide drillsbit can greatly improve the productivity and reduce the cost of each hole processing. CoroDrill 860 is the most rapidly cutting solid carbide drill bit in the market, mainly used for drilling of steel. The drill is well suited for conventional drilling, chamfering hole, inclined surface drilling, drilling cross hole, diamond laminated plate and concave surface borehole etc. In the aspect of hole processing performance, CoroDrill 860 is a new revolution. CoroDrill 860 bit of optimized design, can achieve much more than many of the common drill hole penetration rate and the processing safety - which means that it has the strength to improve reliability under the highest cutting parameters.

This kind of drill is specially designed for machining steel parts, which is suitable for machining of conventional drilling, chamfering, inclined surface, cross hole, pile drill and concave/convex surface. When using high cutting parameters for long or short cutting materials, this kind of carbide drill cuttings control is excellent and can achieve consistent and unfault-free drilling.

And processing all kinds of steel materials under high cutting parameters when chip control is very good, because CoroDrill 860 bit unique channel combined with a new chip groove, even under very high penetration rate can be achieved efficiently chip removal, it ensures the efficient and safe drilling.

The small features of the 860 cutting force of CoroDrill mean that the load on the cutting edge is also small, which is not easy to be problematic when the parts or thin-walled parts are poorly processed. Currently available, 3 ~ 8 times the diameter of the gage length range bit, chip can be used in long and short of scrap materials processing, such as alloy steel, low carbon steel, low alloy steel, high alloy steel and steel castings, etc. The standard diameter range is 3 ~ 20 mm, and the obtained hole tolerance is 8 ~ IT9.

Summary CoroDrill 860 solid carbide drills

The technical features of the head are as follows:

Unique new cutting edge shape can reduce cutting force and improve chip control.

The chip groove shape optimizes the chip forming, which improves the chip flow and chip removal.

The high toughness new tungsten carbideextends the cutter life;

The blade handle can control wear and provide higher reliability;

The enhanced bit round Angle improves the strength and the processing safety.

CoroDrill 860 reduces the processing cost of each hole, improves performance reliability, can achieve higher cutting parameters, and optimizes the performance of chip removal. Long tool life, wear and control.


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November 23, 2017

The influence of cooling strength on the precision casting of aluminum carbide

The old precision casting method USES the fractional crystallizer, especially when casting flat ingots. The water jacket and the crystallizer are separate. With the development of casting technology, the crystallizer of modern precision casting method is one. Use old mold casting cooling water consumption is large, when because the old mould water supply is not closed, open fire and not part of the cooling water cooling, and a cooling and cooling of the secondary cooling intensity difference, inevitably produce some casting defects; And when the modern crystallizer is cast. Cooling water consumption is small. It has been proved that it is only about 70 percent of the amount of water used in the old mold. Currently abroad with low liquid level casting crystallizer, its purpose is to improve the cooling intensityof aluminum carbide, reduce or eliminate a cooling after the heating phenomenon of the air gap area, so almost no secondary cooling quenching condition, flat ingot casting ordinary have mould height fell to 100, of course, this requires the operator has a high operating level or add white liquid level control system.

 

The cooling water temperature requirement is not negligible. Normally, the cooling water temperature is set at 20, but due to regional climatic conditions. The conditions of water supply facilities and the temperature of plant are different, so the quality defects of ingots are found in regional or seasonal ingots. Modern mold water supply system with pulse or cross disguised form function, are determined by the process of programming, so the cooling intensity can be set according to the casting technique for the curve, especially for some bad cold plastic and aluminum carbide, precision casting when cold crack and thermal cracking is almost at the same time, additional water retaining plate system, make the ingot surface temperature to the plastic tensile deformation temperature, eliminate cold cracks ingot casting, craft to take measures to prevent the hot crack, which can obtain high quality ingot.

 

Cooling intensity is also known as cooling speed. The cooling strength not only influences the crack of precision casting, but also influences the structure of the ingot, and increases the crystallization speed of the ingot as the cooling intensity increases. As the cooling intensity increases, the ingots are shallow. The bridge is shrunk in size. The metal shrinkage condition is improved, and the defects such as loose and porosity are eliminated or eliminated. Increase of ingot density: the size of a compound can be refined and the degree of regional segregation can be reduced.

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November 14, 2017

How to make cemented carbide tools more excellent

Carbide blades are composed of metal alloy powder, with more than 100 tons of press molding, and then through high temperature sintering. This is common with our top stone after long-term exposure, exposed to wind and rain, a large stone into numerous small stones and loose "weathered" process, so the alloy blade is very fragile, but also because of this principle.

 

To meet the requirements of a specific application, this product design not just adjust the number of cooling holes on blade. HPG provides a new groove, cemented carbide material - high wear resistant KCP15A material, this product is designed for steel material processing design. Compared with similar bit products, its latest design of self centering point angle and horizontal edge design can ensure the positioning accuracy and the hole verticality better, even in the case of high feed under. The slight chamfer fillet area of blade protection design, can reduce the edge chipping phenomenon, using the same design enhancement, HPG slot type products and therefore suitable for processing the hydraulic manifold application of common intersection and cable outlet, or processing heat exchanger in the production of stacked plates.

 

If the world only hole processing and application of steel materials, HPG groove blade should be sufficient to deal with, but the aerospace industry still needs processing of stainless steel and superalloy materials, automobile manufacturers of cast iron materials but also has a wide range of needs. For the former, the Kennametal Inc provides HPL slot type products, the design of split point of this product, can reduce the cutting force in the aerospace industry, medical equipment and materials processing alloy cutting long chips. And HPG is the same, this product also provides new materials, such as KCMS15, this is the fine grain cemented carbide material products a high abrasion resistance, corrosion resistant coating with AlTiN, can prolong the service life of the cutter. For cast iron, ductile iron and vermicular cast iron, four blade and round groove using HPC drill design, can avoid retracting common processing of these materials when chipping and cracking phenomena, the groove design of the special combination of rake face cooling hole design, the chip can be rapidly discharged.

 

All of these carbide blades adopt the drill point angle design of 143 degrees, through a special edge processing, polishing, or cutting edge rounding processing, ensure the optimization of tool life. The use of HPG, HPC, and HPL groove, KenTIP FS can be a variety of applications to meet the demand of the whole hard alloy drill processing, but its work unit cost is much lower, the performance is comparable or even better, Schmitt said.

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November 03, 2017

The technology of designing and making for tungsten steel cold extrusion dies

Tungsten steel cold extrusion dieis one of the fastener moulds, including processing technology "cold extrusion", is the metal blank in cold extrusion cavity, at room temperature, through the press fixed punch pressing blank to make metal blank parts made by plastic deformation processing approach.

Cold extrusion is at room temperature to plastic deformation of metal material, the unit extrusion pressure is quite big, at the same time due to the turbulent flow of metal materials produced by the thermal effect can make the mould work part temperature as high as 200 above, plus the severe wear and repeated actions of load, the mould are harsh working conditions.

Therefore, the cold extrusion dies of tungsten steel should have the following characteristics:

1. The mould should have sufficient strength and rigidity to work under the stress of cold and heat.

2. The parts of the mould shall have high strength, high hardness, high wear resistance, and certain toughness;

3. The geometrical shape of convex and concave modes should be reasonable, and the transition should be made to avoid stress concentration by using a large smooth circular arc.

4. Easy to replace the vulnerable parts of the die, and the interchangeability and universality of different extruded parts;

5. In order to improve the strength of the mould work, the concave mode is usually used in the prestressed combination of the concave mould.

In the guide pin, guide sleeve is tungsten steel mold standard parts, guide pin, guide sleeve is the main structure for different diameter of concentric cylindrical surface, the choice of material according to the requirements of the guide pillar structure size and material, directly select the appropriate size of hot rolled round steel as the blank material, after carburizing and quenching, in grinding.

The guide post of thetungsten steel mould is mounted on the mould seat. The guide sleeve is mounted on the upper module. The clearance between the guide column and the guide sleeve is smaller than that of the punch and the die.

The requirements of tungsten steel mould guide material:

Tungsten steel mold guide post heart requires good toughness, generally selects for 20 carbon steel material, blanking length should be considered when turning the clamping length, cylindrical stay 3-4 mm cutting allowance, after turning the external cylindrical grinding allowance should be 0.5 mm, permeable zone depth of 0.8 1.2 mm, surface hardness after quenching for 50 to 55 HRC, outer grinder or universal cylindrical grinding machine grinding, grinding should leave after grinding allowance of 0.01-0.01 mm, for the purpose of grinding process is to further improve the quality of roller surface, in order to eliminate the heat caused by neutral hole defects such as deformation on both ends of the guide post, guide pin hole in the center of the heat treatment should be revised, so that a clamping will guide post two cylindrical surface grinding out, to ensure the alignment of a cylinder.


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October 31, 2017

Influence of manufacturing process on service life of carbide punch dies

Carbide punch diesis a special process equipment which is used to process materials (metal or nonmetal) into parts (or semi-finished products) in cold stamping process, which is called cold stamping die (commonly known as cold carbide dies). Stamping is a pressure processing method to obtain the required parts by pressing the material at the room temperature with the die installed on the press so that it can produce separation or plastic deformation. This paper introduces the selection of stamping die material and the influence of die manufacturing process on the service life of carbide punch dies.

 

Selection of blanking die materials

 

The blanking die material should consider batch workpiece production, if the volume is not high there is no need to select the life of die material; should also consider washed workpiece materials, different materials for the mould materials are also different. For punching die, wear resistance is an important factor in determining the die life, depends on the wear resistance steel carbide in hard phase condition and matrix hardness, both higher hardness, the more the number of carbide is better wear resistance. The inferior and common stamping die steel wear resistance are carbon tool steel alloy tool steel - steel - steel - Gao Tangao matrix of high speed steel - steel bonded carbide - tungsten carbide.

 

In addition, the influence of the thickness, shape, size and precision requirement of the workpiece on the choice of the mould material must be considered.

 

1. traditional die steel, for a long time, the domestic sheet blanking die steel for T10A, CrWMn, 9Mn2V, Cr12 and Cr12MoV, etc..

Among them, T10A is carbon tool steel, with certain strength and toughness. But the wear resistance is not high, the quenching is easy to deformation and cracking, hardenability is poor, only suitable for the workpiece shape is simple, small size, small number of blanking die.

The heat treatment process of T10A carbon tool steel is: 760~810 degree of water or oil quenching, tempering at 160~180, hardness 59~62HRC.

CrWMn and 9Mn2V are high carbon and low alloy steel. Quenching is easy to operate, hardenability is better than carbide punch dies, deformation is easy to control. But the wear resistance and toughness are still low, and it is applied to the medium batch, the workpiece shape is more complex blanking die. The heat treatment process of CrWMn steel is as follows: quenching temperature 820~840, oil cooling, tempering temperature 200, hardness 60~62HRC. The heat treatment process of 9Mn2V steel is as follows: quenching temperature 780~820, oil cooling, tempering temperature 150~200, air cooling, hardness 60~62HRC. Attention should be paid to tempering brittleness and significant volume expansion at tempering temperature range of 200~300.

Cr12 and Cr12MoV for high carbon high chromium steel, high wear resistance, quenching deformation is small, good hardenability, mold used for mass production, such as carbide punch dies. However, the carbide of this kind of steel is uneven, easy to produce carbide segregation, and it is easy to break or break during cutting. Among them, carbon content of Cr12 is higher, carbide distribution is more serious than Cr12MoV, brittleness is greater.

Require the use of the heat treatment process of Cr12 steel depends on the choice of the mold, when the mold requirements relatively small deformation and toughness, the low temperature quenching and tempering (Cr12 950~980 DEG C for quenching, tempering; 150~200 C Cr12MoV 1020~1050 C 180~200 C quenching, tempering). If you want to improve the temperature of the mold, improve its hardenability and hardness, can be made of high temperature quenching and tempering (Cr12 1000~1100 DEG C for quenching, tempering; 480~500 C Cr12MoV 1110~1140 C 500~520 C quenching, tempering).

High chromium steel is temper brittleness in the 275~375 C region should be avoided.

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October 27, 2017

Black tungsten is the most important mineral raw material for tungsten smelting

Black tungsten is the main ore that is refined tungsten, also known as tungsten manganese iron ore. Because of the different proportions of ferrotungstate and manganese tungstate, if the iron content is higher, some of them are called tungstenite, and some of them are called tungsten manganese. The black tungsten deposit is brown to black and has metallic or semi-metallic luster. It is commonly found in granite and quartzite. The south of China's jiangxi province, the eastern part of hunan province and the north of guangdong province are the world's most famous areas of the black tungsten mine. The black tungsten deposit is produced in high temperature hydrothermal quartz vein. China's southern jiangxi, eastern hunan, and northern guangdong province are the world famous black tungsten mines. Other major areas include Siberia, myanmar, Thailand, Australia and Bolivia. it is the most important mineral material for tungsten refining.

The black tungsten carbideand tungsten manganese ore are mainly produced in the quartz vein of high temperature hydrothermal quartz and its yunying lithosphere. Veins often exist in the granite intrusion at the top or near contact zone of surrounding rock, mineral association of cassiterite, molybdenite, bismuthinite, pyrite, chalcopyrite, arsenopyrite, topaz, beryl, tourmaline, etc. Tungsten and manganese minerals can also be found in medium and low temperature hydrothermal veins.

Brittle wolframite and easy smash, produced in the process of development and utilization of a large number of black tungsten fine mud, according to a 2010 survey data, at present our country's tungsten ore concentrator fine clay content is between 3% and 17% of total capacity, metal content accounts for about 5% of the total amount of metal - 5% every year in China alone, nearly 245000 tons of tungsten content of fine clay, tungsten fine clay mineral average job recovery is only about 40%.

Before the application of new technology, the fine tungsten mud concentrator has been using shaking table re-election + blanket cloth trough LiuCheng recycling black tungsten fine mud of tungsten, tungsten concentrate containing WO3 9%, the average recovery was 40%, including S 10%, including the As 5%, because of the low grade and impurity to exceed bid, is difficult to direct sales.

Aiming at these problems, study the pulsating high gradient magnetic separation - suspension vibration separator enrichment of preclassification table re-election joint process new technology of recovery of fine mud black tungsten, greatly improved the black tungsten fine clay ore dressing indexes. The technology industry in tungsten successful implementation, built YiTiao annual capacity of 45000 tons of production lines, since 2013 has remained steady production, concentration of tungsten concentrate containing WO3 increased by 20%, recovery rate increased by 40%, fine puree concentrate contains S reduced to < 1%, As low As < 0.5%, tungsten concentrate nearly 130 tons per year. After the implementation of the new technology, the economic benefit of the new technology was 213.987 million yuan in the two and a half years since 2013. Experts believe that in the results of the overall technology in the field of black tungsten fine clay mineral reached the domestic leading level, successfully solving the practical problems of enterprise production, has the very good reference to domestic similar enterprises.


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October 20, 2017

there are special considerations when carbide milling cutters is cutting

carbide milling cutter is made of materials refers to the use of cemented carbide carbide cutter. Understand the need to know what istungsten carbide, hard alloy with high hardness of refractory metal carbides (WC, TiC) micron powder as the main ingredient, with cobalt or nickel (Co) (Ni), molybdenum (Mo) as the binder, powder metallurgy products in vacuum furnace or hydrogen reduction furnace in sintering.

In the three edge milling cutter, milling or some surface milling, cutting force in different directions. Surface milling, milling cutter in the workpiece just outside the cutting force in the direction of more special attention should be paid. When the milling, the cutting force will work pressure to the work table, cutting force inverse milling workpiece and left the table.

As the cutting effect of progressive milling is the best, milling is usually preferred. Only when there is a screw gap in the machine tool or a problem that can not be solved by forward milling, reverse milling is taken into account

In an ideal situation, the diameter of the cutter should be higher than the width of the workpiece, cutter axis and workpiece center line should always leave some distance. When the tool is placed on the center of cutting, easy to produce burr. Continuous cutting edges entering and withdrawing from cutting when the radial cutting force direction will change, and it may damage the spindle vibration the blade may be broken, the surface will be very rough, with slightly off center, cutting force direction will not change anymore -- cutter will get a pre load. We can put the center of milling to drive on the road.

Every time into the carbide cutting cutter, cutting edges are subjected to impact load, transverse load depends on the size of the chip, workpiece material and cutting type. Cutting, between the cutting edge and the workpiece is correctly occlusion is an important direction.

When the cutter axis is completely on the lateral width of the workpiece, the impact force at the cut in is borne by the outer blade tip, this will mean that the impact load from the initial part of the most sensitive tool to bear. The last and carbide cutter to the tip off the workpiece, that is to say from the beginning to leave the cutting blade, cutting force effect has been on the outside of the tip, until the impact unloading so far. When the center line of the cutter is located in the edge line, when the chip thickness reaches the maximum when the blade from the cutting load, reaches the maximum at the cutting impact. When carbidemilling cuttersaxis line is located within the width of the workpiece, the initial impact load when starting position the distance along the cutting edge by far the most sensitive point in the back and bear, knife blade smooth exit cutting.

For each blade, when to exit when cutting off the workpiece cutting edge way is important. The remaining close when retracting materials may be much reduced. When the blade gap chip from the workpiece along the blade rake surface will produce an instantaneous tensile force and burrs on the workpiece. This often produces the tensile force in dangerous situations endangering the cutting edge.

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October 10, 2017

China's carbide cutting tools need to adjust the industrial structure

 

In the new world economic integration wave, the acceleration of global manufacturing to the mainland of China has been a trend, and China will gradually develop into a world-class manufacturing base. The obvious advantage of guangdong, especially the pearl river delta region, we will develop into a global mold production center within ten years. The cutting tool market is in a period of rapid development, and simple tools are being replaced by more and more multifunctional tools. In the production of the future, the user will be on the research and development of cutting tools is put forward higher request,itis not only in the field of cutting tool materials and surface coating technology, but also for cutting tool production technology will have more strict requirements.

 

Carbide can also be used to make the drilling tools and mining tools, drilling tools, measuring gage, wear-resistant parts, metal abrasive, cylinder liner, precision bearings, nozzle, hardware mold (such as wire drawing die, bolt moulds, nut moulds, as well as a variety of fasteners, mold, excellent performance of cemented carbide gradually replaced the previous steel mold).

The worldwide demand for carbide cutting tools is growing. Among them,the growth of European and north American countries is stable, especially in eastern European countries. Asian markets have recovered slightly and the market potential is large, and the market of Latin American countries has grown significantly, especially in Mexico. Cutting tool market demand growth slowly, mainly because of cemented carbide tool life increased, then there is the user request, for the whole manufacturing process instead of many machine tools and cutting tools. As well as the use of multi-function knives, a lot of simple cutting tools have been replaced.

 

According to statistics, the production of tungsten carbidecutter in China is increasing year by year, making carbidecutting tool material enter the development era represented by tungsten carbide. According to the current situation of China market, the market share of domestic carbide turning tool is lower than that of imported tools, so it is urgent to adjust the industry structure.

Our country has entered the stage of manufacturing industry to upgrade, the state planning to high-end equipment manufacturing and information industry into the pillar industry of national economy, which will greatly promote the carbide blade, cutting tool market demand, the cemented carbide industry promising prospects.


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September 29, 2017

Tungsten carbide nozzle for petroleum drilling

The design of the carbide nozzle is sintered according to the heat pressure of the hole and the hot straight hole. In the process of machining, precision grinding and surface treatment must be done to achieve the roughness of the hole roughness of Ra0.1 and r0.025. There is a scientific design of radius of curvature at two entrances.

 

Generally speaking,the shape of the design hole of the carbide nozzle is determined by the airflow pattern. Hard alloy nozzles generally have straight holes and perforations.

 

With the development of the oil industry and the increasing demand for energy, the technology related to oil drilling has been continuously promoted. Early oil drilling mainly USES human impact drill, mechanical cable drilling, rotary drill and so on, in the selected surface position of a certain diameter of the cylinder hole to the underground oil and gas layer. This type of high pressure air drill, drill hole drill and cone drill can be used with carbide ball tooth to improve the drilling efficiency and prolong the life of the drill bit. At present, the researchers have found a more effective high pressure abrasive jet technology for deep and marginal oil reservoirs. High pressure abrasive jet in high pressure water jet as the carrier, add a certain amount of abrasive particles, the impact of jet is greatly ascend,whichalso make the rock cutting efficiency is greatly improved, has a wider application prospect.

 

In the high pressure abrasive jet, a hard alloy nozzle is played. It has high hardness, high strength and excellent abrasion resistance. Usually in the process of drilling, usually in a high confining pressure conditions, thus the nozzle in the working process of the need to bear the high speed impact of high pressure abrasive, thus more prone to wear and failure. Ordinary materials, such as steel nozzles, are prone to heat deformation or disintegration, which require frequent replacement of nozzles, thus reducing the efficiency of drilling. In particular, it is very inconvenient to remove the drill bit when deep drilling is carried out. In addition, the inlaying of hard alloy materials in the most vulnerable parts of the nozzle is also a method to improve the performance of the nozzle and prolong its service life. The tungsten carbide nozzles can further improve the hardness of the nozzle and the abrasion resistance by reducing the size of WC grain size.

 

That is an introduction to the design of tungsten carbide nozzle, you can choose according to their industry and environmental characteristics required for hard alloy nozzle in combination with its working principle and design factors to select and efficient industrial applications.

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September 26, 2017

How to realize easily the low wear of carbide drills

Nowadays on the market is generally a bit alloy steel material whole carbide drills, although the materials are the same, but due to the processing technology, various brands of product quality disparity. Imported and domestic tungsten carbide drills are also very different.

In the mechanical processing industry, enterprises in the production management in order to improve production efficiency, reduce production costs, to ensure machining quality and stability and adequate tool life conditions, which can be achieved by improving the service life of carbide drill bits of hard alloy or improve production efficiency.

In the process of machining, drilling holes or drilling holes are often encountered on the surface or incline, and several cutters are used, which not only affect the cost of production, but also reduce the production efficiency. To this end, cobalt collar developed RT100P high-performance alloy bit, in order to better meet customers’needs.

As an important member of A-Brand products in the series, OSG ADF cemented carbide drill head has multiple functions, stable and high quality of hole machining. Usually, when milling flat bottomed holes, both milling cutters and drills are required. ADF can do one step processing, which can shorten the processing time and simplify the management of tools. And this carbide drills can balance the machining accuracy and reduce the displacement of the drilling hole. The utility model can be widely used in the processing of automobiles, moulds, and various mechanical components.

The cutting edge design ADF uses a sharp cutting angle design, so that in the case of low cutting force can minimize the reduction of material on the formation of burrs; have large chip removal groove, so as to achieve a smooth chip removal.

Patent coating ADF uses the latest patented coating EgiAs, OSG,even in the case of high temperature, this kind of carbide drill bitscan also achieve long life and low wear.

The design of cutting stability ADF can be applied to a wide range of machining conditions, including machining surfaces, surfaces, holes, eccentric holes, thin materials, etc.

 

Processing situation

 

The design of processing range ADF can be applied to a wide range of machining conditions, including machining surfaces, surfaces, holes, eccentric holes, thin materials, etc.. Applicable to a variety of common processing materials, such as carbon steel, alloy steel, hardened steel and cast iron of up to 35HRC. Standard type diameter from 2mm to 20mm, lengthened type directly from 3mm to 20mm.

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September 22, 2017

Manufacturing process of tungsten carbide blades

Blades are made of the world's hardest materials. Without blades, the world of metal cutting would be very different. The main components of cemented carbide inserts are tungsten carbide and cobalt with different proportions. The primary form of the material is powder. In containers weighing about 560kg, the ingredients are well matched and will be used to produce different powders. In the workshop, the dry material is mixed with a mixture of ethanol and water to form a thick, acid like gray paste. When the slurry is dried, the sample is sent to the laboratory for quality testing. These powders consist of many particles of 20-200 m in diameter, very tiny (a hair diameter is 50-60 m).

The powders are packed in a volumetric 100kg barrel and delivered to a stamping machine for making carbide inserts. The operator puts tungsten carbide dies (it is used for stamping different blades) into the machine tool and enters the order number into the computer, filling the mold cavity with the powder according to the order information. The pressure of each blade is as high as 12 tons. The machine tool will weigh each blade and the operator will observe and control it. At this stage, the blade is very fragile and easily ruptured.

The stamped blade needs to be heated to harden it. The job is done by a sintering furnace, which can handle thousands of blades at one time. The pressed blade powder is heated to about 1500 DEG C in the course of up to 13h and is melted into hard alloy. The shrinkage ratio in sintering process is about 50%, so the specification of carbide blade is only half of that before sintering.

Once again, in the laboratory, the top and bottom of the blade will be grinded to the required thickness. Because cemented carbide is very hard, it is necessary to grind it with industrial diamond.

When carbide blade reaches the required thickness, further grinding is carried out to obtain accurate geometry and size. The Kimmer factory staff by using 6 axis grinding plate to meet the stringent tolerance requirements.

After grinding, the carbide blades will be cleaned and coated. To avoid any grease or dust, gloves must be worn when handling the blade at this stage. The blade is placed on the fixture of the turntable and then fed to a lower pressure coating furnace. After coating, the blade shows different colors.

At this point, the blade has been produced, the staff will use the microscope for each batch of products sampling, to ensure that the quality meets the requirements. Before packing, the staff will check again one by one blade, and check the drawings and batch number, and then use the laser marker in carbide blades on the right material, the grey box blade into the label, you can put the blade delivery to the customer.


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September 19, 2017

High-end manufacturing to promote the development of carbide cutters

cemented carbide cutter as a high-performance super hard tool, with the development of Chinese some of the domestic high-end manufacturing industry, has been used more and more widely, can be said that high-end manufacturing greatly promotes the development of cemented carbide tool.

Cemented carbide tools have now been coated with titanium carbide, titanium nitride, alumina hard layer or composite hard layer by chemical vapor deposition. The developed physical vapor deposition method can be used not only for carbide cutting tools, but also for high speed steel cutting tools such as drills, hobs, taps and milling cutters. As the barrier of chemical diffusion and heat conduction, the hard coating will slow down the wear rate of the tool when cutting, and the service life of the coated blade will be increased by more than 1~3 times compared with that without coating.

Due to the high temperature and high pressure, high speed, and working in corrosive fluids in parts, the application of hard cutting materials more and more, the automation level of machining and the machining accuracy of the increasingly high demand. In order to adapt to this situation, the development direction of the tool is the development and application of new tool materials; coating technology for the further development of the tool of vapor deposition coating, the higher hardness in the matrix with high toughness and high strength, better solve the tool material hardness and strength between the contradictions; the further development of the structure of indexable tool to improve the manufacturing precision of the tool; the quality of the products, reduce the difference, and the tool used to achieve the best.

First of all, as the mother of the manufacturing industry, the machine tool industry, especially the leap growth of CNC machine tools, will help to expand the market of machine tool carbide cutting tools. We know that a machine with more than a dozen or more kinds of tools, and knives are consumables, need to be replaced regularly, in order to ensure efficient production efficiency.

Secondly, the demand for carbide cutting tools, such as shield machines, is increasing rapidly in railway and urban rail construction. The cutter belongs to the consumable in the shield machine. The shield machine must replace one hob drill bit on average every 200 meters -300 meters.

Thirdly, the PCB sub industry will be maintained at an average annual growth rate of 9.3% over the next years and is expected to increase by nearly 4 billion yuan in the next 5 years.

Finally, the amount of drilling exploration and mining in the 60%-80% address through the completion of the cemented carbide cutters, with lower grade mines and increasing of mining depth, the average annual growth rate of 5 annual consumption is expected to maintain 30% mining carbide tools in future.

 

 

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September 15, 2017

Present situation and development of cemented carbide bars

In recent years, the domestic production of cemented carbidebars has been increasing, but as demand continues to expand, the market is in short supply, and its quality inspection requirements are also facing difficulties. At present, the detection of cemented carbidebars in China generally adopts manual methods, which consumes more manpower and unstable test results. The automatic inspection equipment is gradually favored by the majority of manufacturers.

According to relevant data, cemented carbidebar has a series of excellent properties such as high hardness, high wear resistance, high strength, bending resistance and long service life of carbide tool. cemented carbidebar is a kind of blank for making drill bits and tools. At present, powder extrusion forming technology is adopted. Now widely used in the production of automobile, tool bit, printed circuit board, the whole engine tool tool, milling cutter, reamer overall, carving knife and so on, but also can produce punch, mandrel, top and perforating tool. With the rapid increase of market demand, ultra-fine grained carbide bars have been used more and more widely. In the field of high speed cutting, due to the high safety requirements of the safety, reliability and durability of the tool, the quality requirements of the internal and surface of the whole cemented carbide tool are more stringent. With the continuous improvement of the internal quality of cemented carbide bars, especially superfine cemented carbides, the quality of cemented carbide tools has been paid more and more attention to.

Itis a kind of product with high requirement of cemented carbide bars material. Oxygen content is considered as a harmful substance in cemented carbide mixture. Whether the water in the atmosphere or reconcile drying is the mixture of oxidation to the extreme, in violation of the normal quality control principle, what is the purpose? The reason is: the production of cemented carbide in the production process control, the biggest difficulty is the balance of carbon and oxygen, the experimental analysis shows that the material on the degree of oxidation and to 3 days 7 days, 15 days to 30 days the oxidation degree is different, but 30 days later after the oxidation of saturated very long almost no change. Therefore, if the degree of oxidation is increased directly to saturation, the method of increasing carbon content should be adopted, and the process control of carbon and oxygen balance will be easy. This process is the control of such cheap operation. This is the biggest feature and advantage of this process.

The structure of the products of the chemical production process is normal, the physical properties of the low quality, the key technology is not a problem in itself but the process needed to do not have the conditions at home and abroad: technology developed, due to environmental constraints, the use of water as a carrier, if the use of water as the carrier, must improve the original carbon the content of the compound WC. While the domestic WC in carbonization when the composite carbon to a certain extent, it will be difficult to improve, for example, when your WC total carbon is 6.2%, may be free carbon is 0.5%, composite original carbon only 6.15%. Carbonation has not yet been achieved, so at present, the carbide alloy bar adopts this process is to use C black in ball milling to improve the total carbon content, free carbon is unable to restore, part of WC is oxidized.

Find more information out online at www.wococarbide.com

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September 13, 2017

Selection and use of tungsten carbide drills bits

Productivity and cost are the biggest trends in drilling today. This means that drilling tools and bits of tungsten carbide bits need to be able to combine some operational mechanisms to develop tools to meet more and faster demand.

Should be based on carbide bitsdiameter, rock properties and production indexes of the drilling strata of the highest penetration (rate of penetration, back to the time, drilling footage) and economic indicators (drilling cost, use) choose the number of cutting tools, the blade on the drill bit size, welding Angle and blade Angle. The inside and outside of carbidedrills, the blade should be symmetrical and flat, and the welding should be firm, not qualified and not allowed to use. The old drills can be reused after being repaired. A needle carbide bit must not be shorter than 95mm. In the case of the diamond drill bit, the inner and outer edge should be consistent with the corresponding diamond bit.

The outer diameter of the hard alloy bit is not too large.

After carbidedrill is drilled into the hole, it should slow down and press the hole to the bottom of the hole, and gradually add enough pressure. When drilling into hard rock, it is strictly forbidden to speed up simply when the pressure is insufficient.

Reasonable control of the length of the return drill. According to the wear condition of the drill, improve the drilling technical parameters of the next time.

The remaining core of the hole must be handled with the old bit and must not be entered into the new bit.

If the drill is in the middle of the road, it may not be difficult to block, but it can be used to wiggle the drill pipe or drive car. The drill bit of a needle carbide drill can be stopped and the normal bit is changed when the above measures are taken.

When unscrewing the bit, hard alloy, alloy tire block or a flat bit are hard alloy. It is strictly forbidden to hammer a bit with a hammer.

Hard alloy bit is easy to change, the customer USES a bit to replace multiple tungsten drill bitscan drill several different size holes. In addition, it also reduces the cost of regrinding welding or solid carbide bits. End users only need to buy the hard alloy drill tip, which is about the same as the cost of regrinding welding or solid carbide.

Hard alloy drilling selection procedure

The diameter, depth and quality of the hole are determined

Production economy and cutting reliability should also be considered.

The diameter, depth and quality of the hole of the carbide drillsare selected

Select the type of bit

Step 2: select a bit for rough machining and/or machining holes. Check that the drill bit is suitable for the material of the workpiece, the quality of the hole and whether it can provide the best economy.

Hard alloy drill selection step - select bit type

Select the number and groove of carbidedrill bits

If the indexable blade bit is selected, the blade must be selected separately. Find the blade suitable for hole diameter and select the groove shape and number of the workpiece material. Select the appropriate number for the whole or welding carbide drill bit.

Hard alloy drill selection procedure - select the drill number and groove shape

Select the type of handle

Many drills have different installation methods. Find the type of machine tool.

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September 05, 2017

Methods for changing cemented carbide cutter into small milling cutter

Existingmanufacturingfor carbide cutter, generally comprises a cutter rod and a cutter head, the cutter bar and the tool head is two parts separately machining, tool head is made of cemented carbideprocessing, turning head mounted to the knife rod, the blade part turning head are generally wider than the width of the knife rod part of the car or on the coarse fine car to facilitate. However, the tool head and the cutter rod installation will always produce precision finishing installation error, and blade turning head due to the difficulty of processing and single shape, it is difficult to achieve the processing of complex shape parts.

 

How to solve the problem that the precision of carbide turning tools is not high enough

 

Carbide cutting tool comprises a cutter rod and connected with the cutter head and the cutter rod end, wherein the knife rod and the cutter head are integrally formed,the cross section of the cutter rod part is square, an angle of the cutter head to the cutter bar section tilt, tilt to the the tip is formed at the edge of the knife head,the side of the blade tip protrusion section for the knife rod, wherein the blade section is inclined to the point between the concave circular arc.

 

Triangular cemented carbideblade changed to small milling cutter

 

In the milling of narrow and shallow groove, if there is no suitable milling cutter,which can find a triangularcemented carbideblade, this made into small carbidecutter.

After finding the triangular cemented carbide blade, measure the thickness of it and use it as thin as possible when it is too thick. According to the center hole size of the blade,a milling cutter rod is made. The blade is mounted on the milling bar and then fastened with a small nut. Because of the hard alloy blade triangular car center hole without keyway,not with the key force, while the small nut fastening force is too small, so we should use the car blade welding brazing method to cutter rod. The workpiece is clamped on the fixture and can be milled after a good knife. Because this kind of milling cutter is negative front angle.Milling depth,feed rate and milling speed can not be large, and add coolant cooling.

 

End milling cutter capable of compressing workpiece in center

 

The workpiece is a square, with a round hole in the middle, the positioning plate according to the size of the workpiece processed with square shallow nest, just put into the workpiece, in the shallow pit or four edges milling out a small mouth, available tools to pull the milling workpiece.

In order to ensure the workpiece in the milling process can not fly out,especially the design of the end milling cutter in the center of the workpiece, the lower end is connected to end mill body screw sleeve ball head pin between the ball head pin and the knife body and a compression spring to put pressure on the ball head pin, so that the ball head pin to fit in too the workpiece.

The carbidecutter can also be mounted on a radial drilling machine for use in milling smaller workpieces. The locating plate can be made of low melting point alloy and tightly pressed on the table of the milling machine or the radial drilling machine.

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September 01, 2017

Anti-oxidation coating for niobium tungsten alloy

As refractory metal,niobium has been used in aerospace industry.Niobium tungsten alloy with high strength at high temperatures and at room temperature and has good plasticity, available conventional forming technology made into all kinds of processed materials and parts, used in the shuttle's skin, nuclear reactor engineering, jet engine parts and space power generation system thermal radiation panel and tubes, etc. Niobium tungsten alloy is used in the related supporting facilities of chang 'e 3.The new niobium tungsten alloy developed by ningxia dongtantalum industry has been successfully applied to the "xinno 6" and "moonshot engineering". Niobium tungsten alloy destructive oxidation happens in high temperature aerobic environment, need through the alloying coating modification and coating protection,high temperature but alloying modification will seriously affect the mechanical properties, so the alloy coating on the surface of the coating protection become a research focus,surface coating of high temperature oxidation resistance directly determines the shuttle engines with niobium tungsten alloy working temperature. The silicified coating was prepared with the preparation of niobium tungsten alloy with niobium tungsten alloy. They developed the niobium tungsten alloy Nb521-1, the main component is 5w-2mo - 1Zr, the rest is Nb. Coating preparation process is as follows: Si, Ti, Cr powder mixed in certain proportion,add a certain amount of organic solvent, load the corundum tank, the use of ball mill mixing and drum rotational speed, 200-300 r/min, corundum ball 5 -- 10 mm in diameter, the ball material volume ratio 1:1, ball grinding time 24 h,after mixing viscous suspension slurry system.Slurry evenly coated in niobium tungsten alloy base material surface, placed in a vacuum sintering furnace in 1320-1320 degrees in the heat preservation 18 to 40 min, repeat the above operation after a coating sintering for secondary coating sintering, coating. They found that the alloy coating will appear in the process of preparation and use of coating accumulation,stacking area coating surface is obviously different from other normal region, accumulation of a bit accumulation and line two kinds of surface defects. The coated slurry is mixed with coating material, and the coating material is deposited on the coated surface of the coating. In the process of melting, when the coating appears to fall off, the shedding area exceeds the self-leveling ability of the remaining slurry, which will generate the line accumulation and the surface defects associated with the leakage.The comparison of the spectra of the coating in normal region and accumulation area shows that there is no significant difference between the composition of the coating area and the composition of the normal coating. The accumulation coating is consistent with normal coating structure,consisting mainly of outer layer,main layer and diffusion layer.Normal coating thickness is 120 microns, point accumulation coating thickness is 120 microns, and line stacking area coating thickness fluctuation is bigger, thicker coating area and other area of about 50 microns thickness difference.Accumulation is coated particles embedded has a little influence on the coating surface and the cross section,and line accumulation is superposition of slurry in the process of coating preparation,although does not affect the structure of the coating, but has a great influence on the thickness of the coating area. Static antioxidant 1800 degrees and 1600 degrees thermal cycle life of contrast test showed that the accumulation point coating with normal coating were similar,which means that under the condition of the experiment,accumulated points won't cause bad influence on coating performance;But line accumulation generally have a coated surface defects such as leakage, associated test and high temperature, when the workpiece surface is leaking area, the workpiece substrate directly exposed in the air, will inevitably lead to artifacts in leakage besmear in rapid failure.Therefore, the effect of line accumulation on coating performance can only be removed by refilling the leakage area. for more details,just visit our website www.wococarbide.com

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