May 25, 2018

Failure reason analysis of cemented carbide cutting picks

Cemented carbide cutting picks are generally divided into two types: cutter teeth (also called radial teeth) and pick teeth (also called tangential teeth).
The pick shape cutter tooth structure is simple, can click on the coal, turning deep, automatic sharpening, often in the course of work keep sharp teeth, coal winning machine load is relatively stable, so than knife cut tooth less energy consumption, long life, and small amount of coal dust, coal quantity is big, suitable for use in hard coal.

In a spiral drum coal mining machine, the gear cutting motion on the spiral drum is the combined motion of the rotation of the spiral drum and the horizontal swing of the cutter arm.

Trajectory for plane of cycloid, this work is divided into a cone, while working as picks wedge into the coal and rock, carbide cutter tooth wedge into the coal and rock in an instant, tooth cone surface of coal and rock pressure exceeds the compressive strength of the coal, the coal and rock crushing, as the pick shape of the cutter tooth wedge, the tension of coal rock mass is more and more big, until pick shape cutter teeth around the segment from the coal and rock breaking down.

The cutting teeth bear high pressure stress, shear stress and impact load when cutting coal rock. Coal hardness is not high, but there are coal gangue and other hard mineral aggregate, and in the process of coal mining and drilling, cutting tooth temperatures will rise sharply, leading to tooth top material softening, accelerate the failure process of the cutter tooth.

Cutter tooth in the process of work, the abrasive (gangue, etc) between the cutter tooth surface and produce larger compressive stress, with sharp edges and has a right Angle abrasive cutting cutter tooth surface formation micro cutting. If the grinding grain is not sharp enough or the Angle is not appropriate, the furrow will be forced out on the surface of the cutter tooth.

With the extension of cutter tooth working time, the abrasive surface of cemented carbide cutting picks push repeatedly, severe plastic deformation of the flow, make the surface of the lower interact, increase plastic deformation dislocation density in the area, surface crack, crack extension, foliated chip cutter tooth surface formation.

And corrosive medium exist in the coal seam and cutter tooth surface chemical reaction caused by the surface material corrosion, mechanical performance, and reduce the surface metal bonding force with substrate material, speed up the cutter tooth material surface wear.

In addition, when cutting tooth cutting coal and rock, bear the impact load of high intermittent, under the action of impact load, the cutting tooth surface harder micro convex point deformation, repeatedly squeezed in nearby soft surface to produce plastic flow and in cutting tooth surface formation accumulation, again and again of elastic-plastic deformation, and the dislocation concentrated, which in turn micro cracks appear on the surface transverse. After wear, the area of the cutting part increases, which increases the cutting resistance and reduces the cutting strength.

When the cutter head is worn to a certain extent, the carbide tip will fall off. The cutting teeth after the tip of the hard alloy teeth have been completely invalid. A large number of statistical analysis showed that the failure modes in accordance with the degree of order are: cutting teeth tooth head wear after cemented carbide tooth loss, broken tooth, tooth body bent or broken, the cutting tooth tooth head wear failure of tooth loss about 85%.

So, in order to improve the service life of cemented carbide cutting picks, first of all to ensure gear tooth surface has enough head of wear-resisting, corrosion resistant, shock resistance, at the same time increase the cutting tooth the tooth body strong toughness (using biya cutter tooth processing equipment, cutting teeth, welding equipment, cutting gear quenching equipment), can effectively extend the service life of cutting teeth.
Related link:
www.wococarbide.com/Transaction/en_information.html

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May 18, 2018

Optimum design of cemented carbide cutting tools

To reduce the manufacturing cost of cemented carbide cutting tools, can control the tolerance zone of the product, for the law Angle is greater than the sharp edge of product design of protective units, straight negative Angle blade design around the size can be directly mould pressing M class precision grade level, combined with modern high precision mold manufacturing technology and precision pressing technology, the material cost and artificial cost, machine cost three aspects comprehensive save the purpose of the cemented carbide product manufacturing cost by 1% ~ 3.5%.
Ever since the first pieces of cemented carbide cutting blades, since its launch in 1927, in order to optimize the blade cutting performance, relevant enterprises in the field of metal cutting has been constantly developing innovative blade geometry and into crumb structure. These design innovations, along with the continuous improvement of the matrix materials, make it possible to make the workpiece materials with higher hardness and higher strength.
The continuous efforts to optimize the cutting process complement the technological progress of machine tools which can improve the processing speed. At the same time, the performance advantage of the modern machining center also puts forward higher requirements for tool manufacturers. Now, they must provide more advanced tool and blade geometry to meet the requirement of metal removal. In addition, the price of hard alloy is rising rapidly worldwide, which puts a lot of pressure on the cost and benefit of the tool manufacturer to develop the product.
These two factors contribute to the emergence of innovative tool products and extend their cutting performance advantages to a wider range of processing areas. These innovative tools can greatly improve the feed rate, reduce the cutting force and save cutting fluid, making it suitable for the modern golden cutting machine with fast speed and light frame structure.
Reliable grip of blade
In the cutting process, it is possible to shift the blade under the action of cutting force to ensure that its automatic clamping position has become one of the main factors that affect the cutting performance of the tool. It is not surprising, then, that many tool makers are investing a lot of resources to optimize the blade grip technology.
Iscar company developed a blade clamping mechanism can reliable clamping has double negative prismatic shape after the double-edge blade of cemented carbide cutting tools, the dovetail cutter holder and the surface of the blade after a prismatic shape can prevent the blade under the effect of cutting force up, cock to ensure with double dovetail prismatic blade of the knife after the correct orientation and firm clamping.
In order to effectively improve the productivity and profitability of machining, now of the indexable insert is used in a variety of optimized geometric blade and the blade clamping mechanism, in order to ensure accurate cutting Angle, good chip control and processing stability of surface quality, reliable, and the use of the latest possibility of substrate material processing all types of workpiece materials.
Finally, if a blade does not reach optimal cutting performance, some evidence can be found to help determine the solution. Using a magnifying glass to carefully observe the blade's cutting edge reveals the essence of the problem. If the inspection indicates that the blade has obvious abrasive wear or slight deformation, it indicates that the blade has a low hardness and needs to be replaced with a higher hardness number. If the blade is broken and the cutting edge appears small, it may be necessary to switch to a lower hardness and better toughness. By understanding how cutting blades are made of, and how for a specific processing customized blades of different grades, you can take a variety of targeted measures, to improve the machining efficiency and reduce cost.

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May 17, 2018

Design and improvement of tungsten carbide boring bar with chip removal

Tungsten carbide boring bar is one kind of boring tool, usually round handle, also has larger workpiece use square tool pole, the most commonly used place is the inner hole processing, expanding hole, copying shape and so on. One or two cutting parts, specially designed for rough machining, semi-finishing or finishing cutting tools for existing holes. Boring tool can be used in boring machine, lathe or milling machine.
The machining process includes the machining and semi-finishing of the hole in the blind hole, which can only be solved by the inner chip deep hole boring tool. In the production site, there are the following disadvantages of the deep hole boring cutter with embedded carbide inside the carbide, which is narrow, and the chip is not smooth and easy to be blocked. The support is easy to wear, the diameter is easy to change; The size of the cutter is large and significant. Therefore, it is necessary to improve the deep hole boring tool in the series.
Whether the product structure and production feature, when processing need to follow the following principles: for processing tolerance zone, code-named H11 high strength alloy steel and high-strength aluminum alloy cylindrical deep hole parts as the main processing objects, and determine the application of deep hole boring cutter size and other main parts of the diameter size; From the existing machine tools in the factory, the size of the connecting part is unified, and the cutter bar size is reduced. The hard alloy blade adopts the general model and number of the national standard.
Design structure improvement
Chip in deep hole boring cutter is a kind of single edge cutting tool, cutting through the boring cutter and cutter bar inside the hollow out, is mainly used to expand the existing hole hole or blind hole, steps and fix its axis is not straight. Chip in deep hole boring cutter has the following characteristics: 1. cemented carbide welding blade on the blade or the knife pad, briquetting and screw compression in the blade head, welded blade not replaced, blade wear can be replaced after installation; 2. the hard alloy guide bar through cant take briquetting pressure and fixed on the boring cutter body, and the cutting plane across 90 degrees and lower differ with cutting edge installation groove, and cooling fluid pressure for lift force generated by offsetting radial and tangential cutting force, the layout and structure of single edge cutting force along the cutting edge is round shape; The tungsten carbide boring bar body is connected by single rectangle thread and cutter bar.
The welding structure of the traditional boring tool is made of cemented carbide blade. Remove the supporting part of the bakelite, adopt the lengthened hard alloy guide strip, and the guide and support function, the cutter body structure is simple, enhance the durability. Expand the chip removal channel to eliminate the blockage and remove the debris.
It is proved by repeated practice on the production site that the formation of cuttings and the effect of cuttings are directly related to the life and quality of the boring cutter. The main factors that influence the cuttings are the physical mechanical properties of the processed materials, the geometrical parameters of the tool and the cutting amount. After determining the machining object, the size of the cutting table of the boring cutter and the size of the walking knife are the main functions.

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May 11, 2018

Many cemented carbide indexable tools are gradually replacing the forming tool

In some cases, the repair of a indexable insert may not be worth the cost. EMUGE provides repair services for its own taps, end mills and thread mills. Although the tap can be resharpened, its geometric shape is much more complex than other tools such as the drill. The inconsistency between the new tool and the repaired tool is one of the reasons for the problem. However, there are also large parts (such as the oil field blowout preventer with a diameter greater than 25mm) that is often used to process the repaired tap. Much depends on the user and the processing technology. One of the key tricks of tool repair is to know when to stop using fixed tools. Everyone's situation is different. One auto parts manufacturer USES a tap to fix the taps for 2,000 to 3,000 holes. Each tap can be reused three times. But if he USES the tap to complete the damage and delivers the repair, the taps may only be able to process another 1,000 holes. Some users will stop using the tool before it breaks or the cutting edge is seriously damaged and will be sent to repair. This should be done for any tool that intends to repair reuse. If the tool is repaired before the insert is broken or badly worn, it is necessary to remove less of the tool material in the regrinding process.

In some cases, many indexable tools are gradually replacing the forming tool. Due to the transposition function, the initial purchase price of this tool is also quite high, but the user does not have to pay the cost of repairing the tool. In the case of conditional permission, the end milling cutter may replace the whole round milling cutter.

Although it has a good application prospect, it still has reason to choose the solid carbide bit when machining the high quality hole with high surface finish and dimension precision. The design ofindexable insertor replaceable cutter head is increasing, but the solid carbide round tool still has its use. Another limiting factor for indexable cutting tools is the need for space for clamping inserts. When the tool diameter is less than a certain limit, the integral tool is the only feasible solution.

Another key factor in increasing tool repair costs is the need to track and deliver the additional tooling inventory required in the repair process. This increases the complexity of managing tool repair processes, especially in complex high-tech production environments. First, there is a logistics process for collecting, packaging, and sending the tools to be repaired and to recover the repaired tools. Then you need to determine the difference of the repaired tool. In addition, it is essential that they be properly tracked or classified so that they can be used correctly for processing. In particular, the vertical milling cutter, for example, will be sent to repair by a vertical milling cutter with a diameter of 12.7mm. The diameter of the cutter returned after the repair may be reduced by 0.51mm or 0.76mm. In order to guarantee the machining quality, the offset of CNC machine tool must be adjusted appropriately.

Related link: http://www.wococarbide.com/Library/libraryinfo/id/1217

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May 07, 2018

Matters to be paid attention to when grinding carbide cutter

In the process of cutting, the cutting edge of the carbide cutter will be blunt and the cutting ability will be lost because of the sharp friction and the cutting heat of the knife surface. Only through grinding can the cutting edge sharp and the correct angle of the cutter be restored. Therefore, the lathe operator should not only know the cutting principle, but also select the tool angle knowledge reasonably.

When the carbide cutter is blunt, it must be sharpened to restore its reasonable shape and angle. The cutter is usually sharpened on a sand turbine. Grinding high speed steel tool with white alumina grinding wheel, grinding carbide turning tool with green silicon carbide grinding wheel.

When the carbide cutter is regrinding, it is possible to grind the relevant blade surface according to the wear condition of the carbide cutter. The general sequence of tool sharpening is as follows: grinding surface, grinding side, flank face, grinding surface and grinding wheel. When the carbide cutter is sharpened, it is also used to grind each knife face with oil stone. Thus, the service life of the turning tool can be effectively improved and the roughness of the workpiece surface can be reduced.

The position and method of grinding the carbide cutter are:

People stand on the side of the grinder to prevent debris from flying when it breaks.

The opening distance between the two hands is held, and the two elbow is clamped to the waist to reduce the jitter during grinding.

When grinding the main and secondary cutter surface, the carbide cutter should be placed in the horizontal center of the grinding wheel. The tip of the knife should be slightly upwards about 3 ~8 degrees, and the wheel should move horizontally in the left and right direction after contact with the grinding wheel. When the carbide cutter is away from the grinding wheel, the carbide cutter needs to be lifted up to prevent the sharpened blade from being bruised by the grinding wheel.

When grinding the cutter face, the end of the cutter head deviates from the angle of a main deflection to the left side, and the angle of the cutter shaft tail crosses the right side to a side deflection angle when grinding the flank face.

When the grinding tool tip is circular, the front end of the carbide cutter is usually supported by the left hand as the fulcrum, and the tail of the carbide cutter is rotated with the right hand.

When grinding the tool, we should pay attention to the following items:

(1) when sharpening, the two hands should stabilize the carbide cutter, and the cutter bar depends on the bracket, so that the worn surface is lightly attached to the grinding wheel. Do not exert too much force to avoid crushing the wheel and cause accidents.

(2) the sharpening tool should be moved around the circumference of the grinding wheel to make the grinding wheel uniform and no grooves. Avoid rough grinding of the carbide cutter on the two side of the grinding wheel, so that the wheel is forced to swing, beat, or even break.

(3) when the cutter head is heated, it should be cooled by water so as to avoid the annealing and softening of the cutter head due to the high temperature rise. When grinding carbide tools, the blade should not be covered with water so as to prevent the blade from being chilled and crack.

(4) do not stand on the front side of the grinding wheel to sharpen the carbide cutter to prevent the operator from being injured when the wheel is broken.

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May 04, 2018

tungsten carbide drilling reamer

The high hardness and high strength of the workpiece are the main reasons for the cutting edge and short life of tungsten carbide drilling reamer blade. It is mainly reflected in the following aspects:

(1) the main deflection Angle of the reamer cutting cone is small, the cutting width is large, and the radial cutting force is large when cutting, so it is very easy to cause the blade of the reamer blade.

(2) in the process of quenching steel, the front Angle of the reamer should be negative, which will increase the strength of the blade and reduce the collapse.

(3) replace the material of cemented carbide blade, preferably select ultra-fine grain carbide blade to ensure high hardness and good strength.

(4) strict control of hinged margin. Because the ream allowance is too big, will increase each blade cutting load, destroyed the stability of the process of ream, and increased the cutting heat, make the diameter of the reamer swell, aperture has been expanding, the surface roughness of the processing quality is poor.

Major changes are made in the following aspects:

(1) adjust the size of the reamer properly. When using tungsten carbide drilling reamer machining hardened steel hinge holes have a certain amount of shrinkage, depending on the size of the hole, shrinkage rate is generally 0.005 ~ 0.02 mm, so the reamer tolerance zone up appropriately, and keep the correction part of the front end with 6 mm long cylindrical blade, the backend to make 0.01 mm inverted cone, in order to reduce friction on the surface of the blade and is ream, try to avoid surface damage.

(2) shorten the length of the reamer to improve the overall rigidity of the reamer. In the case of ensuring the depth of the reaming, shorten the length of the reamer properly, and keep the distance between 15 ~ 20mm from the end surface of the spindle.

(3) appropriately increase the diameter of the blade section to improve the rigidity of the reamer, while at the same time, in the external grinding process, the knife will be rounded to the outside, ensuring the coaxial degree of the blade and Morse taper shank.

(4) increasing the reamer cutting cones Angle, increased from the original 15 ° to 30 °, and radial cutting force to reduce the cutting width.

(5) the reamer Angle from 3 ° to 10 ° before (in front of the blade offset 1 mm), can protect the blade reamer blade does not crack.

(6) after reamer cylindrical blade Angle from 15 ° to 8 °, and retain cylindrical blade with 0.1 ~ 0.15 mm.

(7) in cutting cone grinding reamer law Angle, back from the original tool grinding process to shovel grinding process, namely blade back to curve, can increase the strength of the reamer cutting cones, reduce the reamer blade cutter tooth crack. Reamer cutting Angle of cone method backward shoulds not be too much at the same time, choose to 7 ° when machining hardened steel, shovel mill when actual value is 1.1 K.

( change the carbide welding blade model from E518 to E315, and increase the blade thickness from 1.5mm to 2mm to improve the blade strength.

(9) carbide blade material is changed from YG8 to YS8 or YT726 suitable for processing quenching steel. That is, the blade hardness is increased from 89HRC to 92.5hrc, which greatly extends the life of reamer.

(10) properly reduce the hinged margin and reduce the cutting load. Increase the original value of 11.7mm hinged bottom hole to the value of 11.8mm, that is, the hinged margin will be reduced from 0.3mm to 0.2mm, so as to improve the quality of reaming holes.

By users to use the improved reamer, after more than 20 sets of mold in continuous processing, remove the blade reamer observation, no collapse edge, only slight traces of wear, still can continue to use, reamer life was improved.

For the improvement of carbide taper shank machine reamer, the following requirements should be paid attention to in the process of quenching steel: it is an important condition for cutting and quenching steel. It is necessary to have reasonable geometrical parameters of the tool to effectively perform the cutting performance of the tool material. According to the physical and mechanical properties of tool material and workpiece material, the workpiece shape, the rigidity of the process system and the machining allowance are used to select the reasonable cutting amount.


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May 02, 2018

The price of cemented carbide raw materials continues to rise

Cemented carbide raw material prices have been rising in 2017, caused the carbide product production enterprise production costs have risen sharply, the annual carbide product price rose, cemented carbide production enterprises generally face income drops, even without the embarrassing situation. At present, hard alloy production enterprises have been unable to bear the soaring cost of raw materials. At the end of the year, many hard alloy manufacturers are forced to have no choice but to raise the price of products.

 

In the price of raw materials, tungsten and cobalt rose the most

 

Tungsten carbide powder, the main raw material of cemented carbide, has risen from about 180 yuan/kg at the beginning of the year to about 269 yuan/kg at the end of this year, and the price has soared more than 50% in the whole year. Tungsten powder is also at the beginning of the year from 2017 181 yuan/kg all the way up, early September when the highest even up to nearly 300 yuan/kg, regeneration of the price of tungsten carbide powder is from the beginning of the end of 158 yuan/kg has been up to now 208 yuan/kg, rose by nearly 35%.

 

Tungsten, another major material for cemented carbide, has also risen sharply. The price of cobalt almost doubled in 2017, according to metal bulletin, trading at around $29 a pound. According to ubs, cobalt was the best base metal in 2017.

 

Of course, there are many reasons for the price increase, and the increase of raw material costs is only one of the reasons. The increase in operating costs and labor costs is also an important reason for the increase. In recent years, with the upgrading of the consumer market, the demand for high quality products has increased, while high-quality products are often accompanied by high costs, and the price increases will naturally follow.

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April 26, 2018

Development and trend analysis of China's powder metallurgy industry in 2018

Powder metallurgy is preparing or metal powder with metal powder (or the mixture of metal powder and nonmetal powder) as raw materials manufacturing metal materials, composite materials and various types of products, technology belongs to the comprehensive technology of multidisciplinary cross, involves the chemical industry, metallurgy, material preparation, thermal, mechanical, disciplines such as automatic control technology. The process of powder metallurgy includes four steps: powder forming, forming, sintering and reprocessing.

Powder metallurgy technology has a series of advantages such as energy saving, saving material, excellent performance, high precision and good stability. It is suitable for mass production. As a result of the differences with ordinary processes, powder metallurgy has a unique chemical composition and mechanical and physical properties, which are not obtained by traditional melting methods. The application of powder metallurgy technology can be directly made into porous, semi-dense or fully dense materials and products. In addition, some preparation in traditional foundry method and machining methods of complex materials and components also available powder metallurgy technology, and powder metallurgy technology is now widely industry attention.

In recent years, powder metallurgy industry developing rapidly, especially in automobile industry, machinery manufacturing, metal industry, aerospace, instruments and meters, hardware tools, construction machinery, electronic appliances and the rapid development of high-tech industries, for the powder metallurgy industry has brought the bigger development opportunities. At present, powder metallurgy products are mainly used in automobiles, home appliances, power tools, motorcycles, agricultural machinery and engineering machinery industries, such as the development of downstream industries will drive the development of the upstream industry, the capacity of the whole industry constantly expanding.

From the perspective of a world of powder metallurgy mechanical parts industry, powder metallurgy parts industry is the biggest sales market, at the same time, the field of powder metallurgy parts technology, highest quality requirements of the market. In Europe and Japan and other developed countries, the industry demand for powder metallurgy parts accounted for about 90% of the powder metallurgy market, the powder metallurgy auto parts of North America accounted for more than 80% of the powder metallurgy industry market. From the perspective of the powder metallurgy mechanical parts industry of China, powder metallurgy parts industry the main market is the refrigerator compressor industry, air conditioning compressor industry, motorcycle industry, gradually evolved into the auto industry.

At present, the domestic powder metallurgy market scale is 6.4 billion yuan, among which the auto powder metallurgy parts are around 4 billion yuan. With the wide application of powder metallurgy products: assumes that China's auto sales remain 5% growth, auto bike usage 15 kg of powder metallurgy parts, is expected in 2020 China's automobile powder metallurgy market capacity is expected to reach 14 billion yuan. European and American car companies produce an average of 20kg of powder metallurgy parts per vehicle; The average car produced by a Japanese car company USES about 9kg of powder metallurgy parts. In China, the average use of powder metallurgy parts is only about 5kg. Powder metallurgy industry in China in the future expansion space is larger, as China's automobile market volume growth, further improve bike usage and powder metallurgy parts, powder metallurgy market is expected to usher in a more rapid development.

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April 24, 2018

Experts predict that China's tungsten carbide industry will meet the "golden decade"

In the tungsten industry, the tungsten consumption of tungsten carbide accounts for about 50% of the total consumption of tungsten. Therefore, the development of cemented carbide industry plays an important role in the development of tungsten carbide tool ,China cemented carbide industry starts from the construction of zhuzhou cemented carbide factory in the early 1950 s, more than 50 years, from scratch, development, obtained the accomplishments that have astonished the world, has become the world's largest cemented carbide manufacturing countries, but the overall technology especially high value added products production, there is still a large gap compared with the advanced world level.
Since the financial crisis in 2008, China's tungsten carbide industry has entered a trough, especially in 2015, and it has almost hit rock bottom. But the more difficult it is, the more confident the industry experts are, zhang zhongjian, chairman of the tungsten carbide branch of the China tungsten industry association, said at the time that the industry would be dead. Sure enough, the industry began to grow in recovery in 2016, with explosive growth starting in 2017. According to statistics, compared with 2008, the output of cemented carbide will increase by 100%, sales revenue will increase by 75%, the profit will increase by 136% (the profit in 2017 will be the highest in the last 10 years), and the export volume will increase by 99%.
The 19th big, the socialism with Chinese characteristics into the new era, and high quality development stage of China's economy, Zhang Zhongjian argues that it brings to the cemented carbide industry huge opportunities for development, mainly manifested in two aspects, one is machining solutions to industry growth, one is energy, mineral resources exploitation, infrastructure construction with cemented carbide tools and steady growth.
Mechanical processing solution is cemented carbide industry core product, is the key of the industrial development, in the face of it is automobile manufacturing, CNC machine tools, aerospace, military industry, machinery, mould processing, 3 c industry processing, ships and ocean engineering equipment, and other areas of the manufacturing process. Mr Zhang says the industry's prospects for the next 10 years related to mechanical processing solutions are bright.
Like car manufacturing. According to dong Yang, vice President of the China automobile association, China's auto industry could reach 50 million vehicles in the next few years, so the number of CNC blades in the auto industry alone can reach 4 to 500 million.
Such as mechanical mold manufacturing. China is a major manufacturer and consumer of mechanical moulds. In the next 10 years, the total output value of China's mould industry is estimated to be about 500 billion yuan.
Like the Chinese aviation industry. In the next five years, China's new general aircraft is expected to be 3, 000, and commercial aircraft will begin to be produced, and various types of military aircraft will be replaced.

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April 13, 2018

Performance of welded cemented carbide tool

Welding tool is a way for the blade and blade part of the connection, through the dehydration of borax, copper, ferromanganese, glass powder, solder, the high temperature melt, let alloy, high speed steel,, diamond and cubic boron nitride ceramic material such as razor blades and trough consistent tool rod sticking together, in order to achieve the demand of machining operations, a turning the most widely used for cemented carbide tool, because of the hard alloy hardness is higher, can reach the use requirement, most of the processed material and corresponding relative to other material cost is very low, so it is widely used, carbide welding tool according to the properties and processing object is mainly divided into three kinds, red handle for YG class, represented by YG6 and YG8, mainly used for cast iron, non-ferrous metals and non-metallic materials roughing, skinned, advantage is high bending strength, the disadvantage is that poor abrasion resistance, can only be used for low speed processing, yellow handle for YW classes, with YW1, YW2, mainly used for semi finished high viscosity material such as stainless steel and refined, YW class alloy high hardness, wear resistance, but the bending strength is limited, is suitable for high speed small feed processing, is a good commonality carbide, blue handle to YT classes, represented by YT15 and YT5, suitable for 45 # steel, plain carbon steel processing, high hardness, bending strength is poorer, wearability is good, mainly for roughing and semi-finishing.

Performance of welding tool.

Advantages: the welding tool structure is simple and compact; Strong rigidity and strong vibration resistance; Manufacturing, grinding and convenient; Use flexibility.

Disadvantages: the blade has been welded with high temperature, the strength and hardness are reduced, and the cutting performance is reduced. The blade material produces internal stress and is prone to crack and other defects. The handle can not be reused, waste raw materials; It is not suitable for automatic lathe and nc lathe.

Turning to cylindrical workpieces, end face of the straight head, 90 and 45 elbow tool, hole boring cutter, blind hole boring cutter, cutting, etc.

In order to make the blade weld firmly, the edge grinding is small, so it is necessary to process the groove shape on cemented carbide tool bar, and the common form of knife slot is the following.

(1) the opening groove is simple in shape and easy to process, but the welding area is small, which is suitable for the type C blade.

(2) the semi-closed groove can only be processed by milling cutter, which is difficult to manufacture, but the welding blade is firm, which is suitable for A and B blade.

(3) the closed groove clamp blade is strong, and the welding is reliable. It is used for thread cutting tool and is suitable for type E blade.

(4) the incision groove is used to cut off the cutting knife and slot cutter with small floor area, so as to increase the welding area and enhance the bonding strength, which is suitable for the D blade.

Folding welding equipment

Welding is a process of making or sculpting metal or thermoplastic plastics. During the welding process, the workpiece and solder melt into molten area, and the connection between the materials is formed when the molten pool cools and solidifies. Welding is made by heating, pressurizing, or both, making the two workpieces produce an interatomic process and a connection. Welding is widely used in both metals and nonmetals.

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April 10, 2018

The market for thermal spray coating will reach $ 14 billion 990 million

According to the study, the global market for thermal spray coatings will reach $14.99 billion by 2025. The expanding range of applications, such as wear and corrosion protection, low gas emission, thickness and resistance, has brought new vitality to the market of thermal spraying coatings.
Thermal spray coating market
It mainly includes aerospace industry precision parts, automobile, medical instrument and industrial gas turbine. The use of thermal spraying coatings in biomedicine and medical devices will help improve their wear resistance and improve biocompatibility, as well as help with denture implants.
The expanding range of applications also includes ships, locomotives, tanks, helicopters and motorcycle gas turbines, which have also accelerated the boom in the market for thermal spraying coatings. Considering the properties of high temperature and corrosion resistance, polymer and metal thermal spraying coatings are generally used in industrial gas turbine blades in powder form.
In terms of benefits, ceramics are the biggest applications. According to the statistics of 2016, ceramics account for 30.1% of the global market. And ceramics are mainly used in the biomedical industry. It is expected that this aspect will bring positive factors to the hot spraying coating market in the next 7 years.
The global hot paint coating market is expected to grow significantly due to the impact of the aerospace industry and the auto industry. The growing demand for corrosion resistant coatings in both industries will be a major driver of market growth. At the same time, industrial coatings, wear-resistant coatings, biomedicine, food processing, electrical and electronics, semiconductors and energy will also have a positive impact on the market.
According to the report
In 2016, the global thermal spraying coating market was worth $8.33 billion. According to the data, this number will increase due to the growth of automobile industry demand.
Revenue growth in medical applications is the fastest growing, with a compound annual growth rate of 7.8 per cent between 2017 and 2026, affected by increased demand for better health care facilities and hospitals.
The ceramic sector, which has become the highest-paid sector in 2016, it will continue to grow steadily over the next few years and is expected to reach $4.6 billion by 2025.
Thanks to strong growth in healthcare, oil and gas, the region's industries will see substantial growth over the next eight years, particularly in India and China, with gas and cars. The compound annual growth rate will reach 7.9% from 2017 to 2025.

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April 04, 2018

Prevention and correction of die die failure in tungsten carbide die

One of the forms of stamping die burst is the mold impact. The failure modes of die are mainly wear failure, deformation failure, failure and so on. However, due to the different process of stamping forming, different working conditions will affect the life of tungsten carbide die.

1. Stamping equipment

The precision and toughness of the press equipment (such as press) is very important for the impact of the die life. The higher the precision of the stamping equipment, the better the toughness, the higher the die life. Complex, for example, silicon steel sheet for Crl2MoV die material, used in ordinary open presses, average after grinding life is 1-30000 times, and used the new precision presses, die after grinding life of up to 6 ~ 120000 times. Especially small foot clearance or no clearance punching die, carbide die and precision punching die must choose high precision, good press rigidity, otherwise, will reduce the life of tungsten carbide die, serious damage to the mold.

2. Mold design

Precision of guide mechanism of mould. Accurate and reliable guidance, to reduce wear and tear of the mold parts, avoid has enormous influence on the convex and concave mold damage, especially no clearance blanking die, compound die, and small clearance and multistep progressive die are more effective. In order to improve the die life, it is necessary to select the guide form and determine the precision of the guiding mechanism according to the requirements of the process nature and the precision of the parts. In general, the precision of the guiding mechanism should be higher than that of convex and concave modes.

3. Stamping process

(1) raw materials for stamping parts.

In practical production, because of external pressure parts raw material thickness tolerance error, material performance fluctuation, poor surface quality (such as rust) or not clean (such as oil), wear, easy to cause mould parts as well as the collapse edge. To this end, it should be noted that, as far as possible, the material with good stamping process is used to reduce the stamping deformation force. Before stamping, strictly check the number, thickness and surface quality of the raw materials, and clean the raw materials, and remove the surface oxides and rust when necessary; According to the stamping process and the type of raw materials, the softening and surface treatment can be arranged as necessary, and the appropriate lubricant and lubrication process should be selected.

(2) layout and edge.

The unreasonable reciprocating feeding method and too small edge value often result in sharp abrasion or convex and die damage. Therefore, considering to increase the material to finish at the same time, must according to the requirements of the parts processing and batch, quality and mould fit clearance, selecting reasonable layout method and the boundary value, in order to improve life for tungsten carbide die.

4. Mold materials

The influence of mould material on die life is a comprehensive reflection of material type, chemical composition, structure, hardness and metallurgical quality. Mold design of different materials is often different. Therefore, for the working parts of the die material puts forward two basic requirements: (1) the use of material performance should have high hardness and high strength, and high wear resistance and sufficient toughness, heat treatment deformation is small, has the certain red hardness; The process performance is good. The processing and manufacturing process of die working parts is generally complicated. Therefore, it is necessary to have adaptability to various processing technologies, such as malleability, machinability, hardenability, hardenability, quenching crack sensitivity and grinding process. According to the material characteristics, production batch and precision requirements of the stamping parts, the mould material with excellent performance is selected, and its technology and economy are also considered.

 

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March 30, 2018

3D glass bending machine tungsten carbide hot plate

With the advent of the era of 5G, mobile phone 3D glass screen and back cover will be into explosive growth, the most important thing is to hot bending glass lenses production process of forming. In the hot bending machine evenly heat in the process of high temperature hot pressing glass, you need to use to the high temperature resistant, thermal conductivity of the powder metallurgy soaking plate to heat evenly hot pressing operations.

We use tungsten carbide has good strength and toughness, coefficient of thermal conductivity to the principle of increase and decrease with increasing of tungsten carbide plate, tungsten carbide of coefficient of thermal conductivity is greater than the titanium carbide, adding nickel, chromium carbide can effectively inhibit alloy creep, improve the ability to resist plastic deformation, and can improve the corrosion resistance ability; Molybdenum carbide with high melting point and hardness, good thermal stability and mechanical stability and excellent corrosion resistance, etc, tantalum carbide can improve the product high temperature hardness, strength and resistance to high temperature oxidation, the development of the cemented carbide soaking plate has high hardness, good strength, high temperature resistant, high temperature oxidation resistance, good thermal conductivity and high temperature uniformity, completely meet the requirements of the 3D glass bending machine.

The most important part of the 3D glass production process is hot bending. Hot bending core workspace heating temperature often reaches 850 ℃ to 950 ℃ to 1150 ℃ or higher, so high temperature hot bending machine soaking for 3D glass tungsten carbide plate is to have special requirements, and glass material under the condition of high temperature have strong corrosion effect. It should not only guarantee the density of soaking slab high hardness, and to ensure that the high-temperature thermal deformation and strong corrosion resistance, this undoubtedly for powder metallurgy new material is a kind of new material application requirements and challenges. The tungsten carbide soaking plate of our company has excellent high temperature hardness, high thermal conductivity, thermal stability, high temperature resistant deformation and excellent anti-corrosion resistance.

The main process production directly affects the use performance of 3D glass thermal bending machine.

1. Preparation process of mixture.

The physical and chemical properties of tungsten carbide plate are controlled by the optimum composition ratio, including the room temperature and high temperature hardness, corrosion resistance, oxidation resistance, bending resistance and compressive strength. The grinding stability of each batch of mixture is controlled by the ball milling factor, including the distribution of WC particle size, the distribution of hard phase and bond phase, to control the fluctuation of the physical properties of the alloy.

2. Pressing process

It can be used to control the sintering deformation of the alloy and reduce the internal stress of the alloy.

3. Sintering process

Through multiple atmosphere removal compact forming agent, strictly control the compact surface and core, the boat interface and boat interface carbon potential, and through the optimal control in the process of alloy in sintering temperature curve to contraction, strictly control the size of the alloy, parallelism and minimal internal stress.

4. Heat treatment process

Make the best heat treatment process, through high temperature quenching change phase structure of the binding phase, related components dissolved in full, to strengthen the binding phase, improve alloy strong toughness and corrosion resistance, and eliminate alloy produced in the process of sintering shrinkage internal stress, good for alloy after surface finish.

5. Aging treatment process.

After grinding, the tungsten carbide is treated by aging process, and the processing stress produced by alloy in fine grinding is treated, and the dimension and parallelism of the alloy are controlled.


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March 23, 2018

Tungsten carbide spade drill

Tungsten carbide spade drill is made up of handle and blade. Normally, the shank of a hard alloy spade is made of steel, and the blade of the convertible head is made of hard alloy. The hilt has two structures: the side handle and the Morse handle. It is used for CNC lathe and CNC machine tool. The Morse handle is used in traditional equipment such as vertical drilling, rocker drill and pusher. By simply installing a cooling ring device, the external cooling can be converted to internal cooling. The cooling water enters the tool rod through the cooling ring and is cooled directly to the blade section through the internal cooling hole. And the high pressure of the cooling water is more conducive to defecation.
The blade can also be divided into two types, carbide blade and high speed steel blade. The range of carbide blades ranges from 9mm to 32mm. The range of high-speed steel blades ranges from 9mm to 68mm, and part of the non-standard blade can even be made larger. The high speed steel blade is generally cobalt high speed steel with 8% cobalt, which has good wear resistance and toughness. However, the performance of the carbide blade is much better than the steel blade, and the service life is relatively long.
The tungsten carbide spade drill is positioned through the groove, and the two screw holes are fixed and fixed, which can ensure the symmetry of the blade between 0.01 and 0.02mm. According to the size of the blade, there are usually 2 to 6 chip slots. According to the different cutting materials, the tip of the blade is X - shaped drill point or s-shaped drill tip.
Advantages of hard alloy shovel drilling
A deep hole that is easy to double. The blade is a symmetrical structure with double edge cutting in the center, and it is made of tungsten carbide, so it can reach even the deep hole of 20D. The ordinary U drill, the shallow hole drill can not hit the deep hole, can be completed by the shovel.
The hard alloy shovel can be widely used in traditional machine tools such as rocker drill. Traditional machine tools are not able to be used because of low spindle speed, poor rigidity, weak power, general fast drilling, and U drill. And the spatula is made of hard alloy coating blade, which has high toughness and impact resistance, and can effectively solve the problem of collapsing blade.
The accuracy of tungsten carbide spade drill is much higher than that of U drill. A U drill is a blade that installs two asymmetric cutting blades. Blade cut into the workpiece surface, within the blade on the blade and the blade of axial force is not balanced, will cause the change of size, so U boring only as rough machining cutter, precision of + / - 0.1 mm. Blade symmetry cutting, the dimension precision can be controlled within 5 threads. Direct drilling can meet the requirement of thread bottom hole. The side of the shovel blade is trimmed with a smooth blade, which can reach RA1.6 through the extrusion of the polished blade belt.

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March 21, 2018

Tungsten carbide type O seals

Tungsten carbide type O seals is a kind of seals with circular cross section. Mainly used for mechanical components to prevent leakage of liquid and gaseous media under static conditions. In some cases, tungsten carbide type O seals can be used as dynamic sealing element axially reciprocating motion and low-speed rotational movement.

Application of tungsten carbide seals for Type O

Tungsten carbide type O sealsis widely used in kinds of machines, which is for sealing at predetermined temperature, pressure, various liquid and gaseous media, at rest or in motion state. As a seal element on machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastics machinery, agricultural machinery, and a variety of instruments. Seals is mainly used for static and reciprocating seals. When the seals for rotary motion, it is only as sealing device of low-speed rotary. Tungsten carbide type O seals is typically installed on the outer or inner circular cross-section from the seal rectangular groove.

Properties

Tungsten carbide type O sealswith excellent sealing, damping effect in the oil, acid, wear, chemical attack and other environments. So the carbide seals is the most widely used as seal in hydraulic and pneumatic drive system. Tungsten carbidetype O seals sealing action of its own, not a cyclical adjustment, can be used to seal against the direction of movement of the sliding seal impact, small size at the same time easy to use, because of the large seal adaptability, so a very wide range of applications. But the pressure reaches a certain peak of easily deformed under pressure, there is the possibility to extrusion gap, with more application in terms of aviation and hydraulic engineering.

We'd better try to use a large cross-section of the O-ring. In the case of same space, the volume of carbide O-ring is extruded into the gap should be smaller than it is to squeeze the maximum allowable value. Different types of fixed seal or dynamic seal applications, carbide O-ring provides designers with an effective and economical sealing element. Carbide O-ring is a double-acting sealing element. Initial installation aspects radial or axial compression, giving O-ring seal its initial capacity. Sealing force generated by the pressure of the system and the total synthesis of the initial sealing force of the sealing force, with which to improve the system pressure increases. Carbide O-ring seal in the static case, display a prominent role. However, where appropriate dynamic, the cemented carbide O-rings are often used, but it is limited by the speed of seals and pressure.
Related link: http://www.wococarbide.com/Transaction/en_information.html

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Tungsten carbide type O seals

Tungsten carbide type O seals is a kind of seals with circular cross section. Mainly used for mechanical components to prevent leakage of liquid and gaseous media under static conditions. In some cases, tungsten carbide type O seals can be used as dynamic sealing element axially reciprocating motion and low-speed rotational movement.

Application of tungsten carbide seals for Type O

Tungsten carbide type O seals is widely used in kinds of machines, which is for sealing at predetermined temperature, pressure, various liquid and gaseous media, at rest or in motion state. As a seal element on machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastics machinery, agricultural machinery, and a variety of instruments. Seals is mainly used for static and reciprocating seals. When the seals for rotary motion, it is only as sealing device of low-speed rotary. Tungsten carbide type O seals is typically installed on the outer or inner circular cross-section from the seal rectangular groove.

Properties

Tungsten carbide type O seals with excellent sealing, damping effect in the oil, acid, wear, chemical attack and other environments. So the carbide seals is the most widely used as seal in hydraulic and pneumatic drive system. Tungsten carbide type O seals sealing action of its own, not a cyclical adjustment, can be used to seal against the direction of movement of the sliding seal impact, small size at the same time easy to use, because of the large seal adaptability, so a very wide range of applications. But the pressure reaches a certain peak of easily deformed under pressure, there is the possibility to extrusion gap, with more application in terms of aviation and hydraulic engineering.

We'd better try to use a large cross-section of the O-ring. In the case of same space, the volume of carbide O-ring is extruded into the gap should be smaller than it is to squeeze the maximum allowable value. Different types of fixed seal or dynamic seal applications, carbide O-ring provides designers with an effective and economical sealing element. Carbide O-ring is a double-acting sealing element. Initial installation aspects radial or axial compression, giving O-ring seal its initial capacity. Sealing force generated by the pressure of the system and the total synthesis of the initial sealing force of the sealing force, with which to improve the system pressure increases. Carbide O-ring seal in the static case, display a prominent role. However, where appropriate dynamic, the cemented carbide O-rings are often used, but it is limited by the speed of seals and pressure.

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March 16, 2018

Tungsten carbide rod with coolant hole

Tungsten carbide rod with coolant hole is made of hard alloy material, which is mainly used to process various hard alloy cooling holes. It works mainly by carbide rod internal spiral cooling hole hole, the coolant under high pressure to the cutting edge, so as to reduce the bit especially the bit at the top of the high temperature. At the same time, the chip can be removed from the side, so as to effectively remove the debris and greatly improve the surface finish of the workpiece.

It is more common to extend the life of drill bit by external cooling process. With the wide application of this process, however, many users find that in this process, because the debris in the manufacturing process of continuous discharge, to some extent hindered the coolant reached the top of the tool, to reach the ideal cooling effect. At the same time, with the increase of machining depth, the effect of external cooling process is worse and worse, and it may hinder the expulsion of chip. Therefore, the internal cooling process is present, and the application of  tungsten carbide rod with coolant hole is more and more extensive.

It has the advantages of good cooling effect, high cutting efficiency and long service life. In the process of carbide bit machining, the coolant is sent to the cutting edge under high pressure through the hole in the drill bit. Such as coolant quickly delivered in a timely manner, can quickly reduce the cobalt high temperature especially the bit at the top of the head, scraps discharge from the side, at the same time can be carried on effectively will produce chip removal, improve the surface finish. According to the research, the hard alloy bit produced by tungsten carbide rod with coolant hole can not only improve the efficiency of the deep hole processing, but also nearly double the service life of the tool.

At present, the production technology of the world's spiral carbide cooling hole rods is:

Mosaic method: the surface of tungsten carbide bar is machined into a spiral groove and then pressed into a hard alloy tube. However, the method is complicated, the expansion coefficient adjustment and control difficulty of alloy mixing are difficult, and the dimension control is difficult. Also can be in machining the spiral groove and casing pressure in the extrusion molding, however, for the combination, the thinner the wall, the better, as the rotation, tooth surface as wide as possible, so the mold manufacturing difficulty, and a set of can only make one size carbide rod cooling hole.

 

External screw extruding method: 1.the concave mold diameter belt is provided with thread, the material is extruded by rotation; Cooling hole core rod thread slot must cooperate with manufacture and concave die, the technology design of the die is relatively complex, mould die and core rod must be in sync, otherwise will cause out-of-tolerance size parameters, cooling distributed partial or crack. 2. the concave mold active rotation drives the material to rotate, simultaneously guides the nylon wire embedded in the material. The dragon silk (soft core) needs to be guided into the inside, and the shape and size of the screw hole is difficult to control, and if the process limits the screw hole specification and the length of the rod in the later stage of burning; The outer surface quality is difficult to control when the rod rotates forward. External screw extrusion is a kind of molding technology which is widely used at home and abroad.

 

Internal screw extrusion method: using the special structure of twin-screw extruder, the core rods extends to the screw extruding, use the screw driver core rod rotation or drive core rod elastic needle in the rotation, to shape the screw hole; The die design of this process is simple, but the squeeze parameter is strict, and the extrusion speed and the core speed of the material must be matched. Otherwise, the size parameter of tungsten carbide rod with coolant hole cannot meet the requirement. Because of the difficulty of this technology, only a few foreign companies such as konard friedrichs in Germany can produce, and there is no such technology in China. The technology to meet the speed matching, core rod manufacturing, flexible needle should correspond with the performance of extruder screw extrusion speed and speed matching, limiting the generality of the same equipment and can produce the specifications of the bar is kind.

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March 14, 2018

Tungsten alloy rod added mo

Tungsten Alloy Rod Added Mo Introduction

Tungsten alloy rod added Mo(WMoNiFe), similar to one type of famous brand rod, is a tungsten-based material made through special high temperature powder metallurgy techniques. This kind of WMoNiFe material has a low coefficient of thermal expansion, good thermal conductivity and excellent properties at elevated temperatures. Tungsten alloy rod added mo(WMoNiFe) can be used as welding rod due to its high melting point and low coefficient of thermal expansion. Elements added to tungsten alloy rod can enhance machinability, ductility and welding properties. Material properties are very important for tungsten alloy rod added mo to be much proper while associating other tool materials by heat treatment.

Tungsten Alloy Rod Added Mo Typical Application

tungsten alloy rod added mo

Tungsten alloy rod added mo is used in electrobrazing applications where heat balance is important. The tungsten alloy rod added mo(WMoNiFe) is similar to one type of famous brand rod with good anti-sticking qualities, high temperature abrasion and hardness properties. The oxidation resistance of both tungsten alloy rod is excellent up to 1100oF.

WMoNiFe is used as a base due to its high melting point and low coefficient of thermal expansion. These properties of tungsten alloy rod added mo result in less thermal cracking and soldering with the die cast or extruded material while welding. Elements of tungsten alloy rod added as WMoNiFe imporve its machinability, ductility and welding properties. The good thermal conductivity provides additional benefits to increase cooling to cool areas and potentially increases production rates. Material properties ensure tungsten alloy rod added mo easiler to be associated with heat treatment of other tool materials.

Tungsten Alloy Rod Added Mo Benefits:tungsten alloy rod added mo

Removes heat four times faster than traditional tool steel

Reduces sticking

Low erosion rate

Provides additional cooling

Readily machinable

Worn parts are easily re-machined into smaller diameter core pins or larger extrusion dies

Requires no pre or post machining heat treatment

Easily welded and repaired with Welding Rod

Contains no Beryllium

Tungsten Alloy Rod Added Mo Results

tungsten alloy rod added mo

Longer die and core life

Less production downtime

Better surface finishes on products

Fewer rejects

Lower cost per piece

Less porosity in heavy sections

Faster cycle times

Tungsten Alloy Rod Added Mo Availability:

Tungsten alloy rod added mo can be finished as per customized shape and size. Material is in rough oversize to be finished as round bars rages from 3/16 inch to 4inch dia. x 12inch long. Rectangular bars and finished tungsten alloy rod added mo can be readily manufactured to specifications.

The high density of tungsten carbide tool shrinks considerably during sintering. Depending upon design of tungsten alloy rod added mo and configuration, parts may be pressed and sintered close to final size and configuration to minimize machining costs. Special shapes of tungsten alloy can often be pressed in the die and sintered to near net shape. 

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March 08, 2018

How to reduce the thermal stress of tungsten carbide blank during welding process

Tungsten carbide blanks are very common materials for cutting tools: and for example, saw blades, lathe bits, drill bits, milling cutters and dental drilling tips are usually made of hard alloys. It can make these blades longer than most other materials, so they are popular among these carbide tools.

Tungsten carbide blank is made of a cemented carbide crown on the steel drill body. This drill adopts self-centering blade geometry, cutting force is small, on the eve of the eve of the workpiece material all can achieve excellent chip control, machining the hole of finish good, dimensional accuracy and positioning precision is very high, no longer for subsequent finishing. The drill adopts internal cooling system, which can be used in machining center, CNC lathe or other high rigidity, high speed machine tool.

Replaceable tungsten carbide blank

Replaceable carbide blank is a new generation drilling tool. It is composed of steel and can be a change in solid carbide drill body crown, compared with welding type carbide drill, its machining precision eight half of it, but because of the tooth crown can be changed,which can reduce processing costs, improve the drilling rate. This kind of drill bits can obtain the precise aperture size increment and has the self-centering function.

Production of tungsten carbide blank

The distance between tungsten carbide plate and the slot surface is 0.3~ 0.5mm for each side and 0.1~ 0.15mm for the non-compensation gasket. The compensation gasket is used to reduce the thermal stress during welding of alloy sheet. The compensation gasket can be made of low carbon steel wire mesh or copper sheet. Its width and length are equal to that of alloy plates. For tungsten carbide plates with no compensation gaskets, they shall be fixed in the required position by means of inlaying.

Application and properties of tungsten carbide blanks

1. It can be suitable for drilling with more complex materials, and can choose higher cutting speed.

2. High performance alloy blade for selected alloy bits, effectively reduce the collapse knife and maintain good wear resistance.

3. Multi-layer geometric cutting edge, improve drainage performance, and maintain small cutting resistance.

4. In addition to the usual rectangular handle, it is equipped with a variety of handles, suitable for various drilling machines and drilling machines.

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March 02, 2018

Type of ceramic inserts and applicable to processing material

As non-metal tool materials, ceramics are widely used in metal cutting. As heat resistant alloy materials, such as Inconel alloy parts in aerospace industry and other industry increasingly extensive application, puts forward higher requirements for cutting tool, so the ceramic insert was born, the more difficult to machining materials exhibit excellent cutting performance.

Ceramic inserts are manufactured in very similar ways to carbide inserts. Because ceramics do not bond as easily as other materials, they must be subjected to much higher temperature and pressure during sintering.

Ceramic inserts although its hardness, high wear resistance compared with carbide insert a lot, but big brittleness is the biggest flaw, thus failed to get a good development, only for less than the amount of finish machining process, and to avoid discontinuous cutting process. Therefore, when choosing the insert number, it is better to consult the cutter engineer of the enterprise, and choose the product to recommend the product to be more reliable.

Ceramic inserts than compared carbide insert, can bear the high temperature of 2000 degrees, and hard alloy at 800 degrees is soft; Therefore, ceramic inserts have high temperature chemical stability and can be machined at high speed, but the disadvantage is that alumina ceramic inserts are very low in strength and toughness and are easily broken. Because of ceramic inserts, high temperature resistant, high temperature and high speed cutting is more advantageous, because the ceramic low thermal conductivity, high temperature, just on the tip of the heat generated by the high speed cutting as chip away, so most researchers think: alumina ceramic inserts can, and the best above 10 times that of the cemented carbide cutting tools under linear velocity, can truly reflect the advantages of ceramic insert.

In order to reduce the sensitivity of the ceramic insert to the crushing, in an attempt to improve its toughness and improve the impact resistance, it added zirconia or added a mixture of titanium carbide and titanium nitride. Although added to these additives, ceramic inserts are much less tough than carbide inserts.

Another improve alumina ceramic insert toughness method is to add crystal texture in material or silicon carbide whisker, through these special on average only about 1 nm in diameter, 20 microns long strong whisker, significantly increased the toughness, strength and thermal shock resistance of ceramics. It is restricted by its impact toughness and has been used in the field of fine car processing.

Like alumina ceramic inserts, silicon nitride ceramic inserts have higher thermal hardness than hard alloy inserts. It is also good for high temperature and mechanical shock. Compared with alumina ceramic insert, its disadvantage is that it has insufficient chemical stability in processing steel. However, a silicon nitride ceramic insert can be used to process gray cast iron at 1450 feet per minute or higher.

Ceramic inserts are applicable to processing materials: ceramic inserts can not be used for aluminum processing, but they are especially suitable for gray cast iron, ductile iron, hardened steel and certain unhardened steel and heat-resistant alloys. However, for these materials, the application of ceramic inserts is successful, and the appearance and micro-quality assurance of insert edge is required, and the optimal cutting parameters are required.

Related link:

http://www.wococarbide.com/

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