Application Of Tungsten Carbide Rods

Tungsten carbide rod is surfacing electrode which is regarded carbon steel as the core. It is usually own sodium type coating with low hydrogen. Tungsten carbide rod is transition by the tungsten carbide alloy in drug skin. Due to the thick skin, the sleeve will also be long. After the rod become red, the drug skin is easy to fall off with small parts. So it had better use direct current. The electrode section is positive and it use small current.

Tungsten carbide rod is apply to the repair of abrasion parts and mechanical parts which under strong wear. Such as concrete mixing blade, bulldozers and pump blade, dredging machine blade, high speed mixing sandbox, impeller blower, the mixer blade, mud pump and coal chute, cement plant tray, spire, fence tooth, lining board, jaw plate, rock breaking machine, hammer and electric bucket tooth.

Tungsten carbide rode don’t need any preheating before welding. Certainly it needs to heat after welding. Tungsten carbide rod has a series of advantages, such as in high hardness, good wear resistance and erosion resistance. With its good wear resistance, the device service life could be extended about four to eight times.

How To Recycle Tungsten Carbide Powder

In the times of communication developed, our information is developed rapidly. So we should make good use of the conditions of the times. Leave a message or set up their own information platform in the information platform. Many people who want to sell their tungsten carbide power always distress where to sell and how to sell them in a good price. They had better expand their information and create credibility to get more and more visit. This is not only save times and energy, but also improve the efficiency of tungsten carbide powder recovery. This recycle method is called waiting for customers.

In simple words, tungsten carbide powder recycling is nothing more than recycling enterprises of the unwanted tungsten carbide powder material. Sometimes we go to some enterprises, there are some waste tungsten carbide power left. At this time, in order to treat these waste material with an easy method, they will like to give us a low price to recycle them. So going to related enterprises is a practical method for recycling tungsten carbide powder.

Nowadays more and more people like to solicit business by calls. In fact, some people who does the business of recycling tungsten carbide power use calls to get business. But it is often difficult to get an effectively  call. In spite of this, people still not give up using this method to get their business.

Waste Tungsten Carbide Roll Ring Process

The processing principle of waste tungsten carbide roll ring is that making the inside filling up through a core shaft. And finally reach the clamping effect. Generally speaking, it can make thin wall sleeve expansion of 0.15mm.

Wast tungsten carbide roll ring should choose cutting fluid reasonably, that can promote friction in grinding process, decrease grinding heat. the most important function of cutting fluid is cooling, lubrication, cleaning, rust. The selection of grinding fluid has a big influence on grinding hard alloy scrap tungsten carbide roll ring. Good grinding fluid can promote work efficient and decrease roughness value of work piece surface.

The wheel sand of wast tungsten carbide roll ring is made of abrasive and binder. It is processed through several steps, such as limit, boring and sintering. It is also composed by abrasives, binders and space. Abrasive is equivalent to the cutting blade which owns cutting action. Space is favor of removing chip and heat dissipation. In general, people like to choose diamond grinding wheel which regard resin and bronze as binder. This will play a good role in batch processing of waste tungsten carbide roll ring.

Reduction Size Of Tungsten Carbide Powder Oxides

There are many factors that influence reduction size of tungsten carbide powder oxides. Such as tungsten carbide powder properties, impurities, and temperature. Restoration activity of tungsten oxide has obvious effect on the particle size of tungsten powder. Material with bigger restoration activity is more easier to get the tungsten powder with fine grained.

The influence of impurity elements in tungsten particles change, can be divided into three categories. The fist category is that impurity elements which represent by alkali metal can play the carrier effect of oxygen. It can promote chemical reaction and enhanced tungsten powder particles grow. The second one is that calcium, magnesium and silicon have little influence on tungsten particles growing. Besides materials which represent by aluminum can form a thin oxide layer with high stability. Elevated temperature can accelerate the reduction reactions. And it also speed up the creation of water vapor, particle growth and aggregation.

Partial pressure of water vapor is a main factor to powder particle size and shape change. Water vapor is a basic condition to chemical vapor removal reaction, it includes water vapor in hydrogen and reduction reactions. It is not a stable value in the process of recovery.

Technology Of Manufacturing Dies By Tungsten Carbide Powder

Tungsten carbide powder is in high demand for many industries which is used for manufacture stamping dies. In order to meet the requirements of quality and demand, technology of tungsten carbide power manufacture the dies and its material have been improved constantly.

Tungsten carbide powder is main material for making hard alloy. It has metallic luster and its hardness is similar to diamond. As we all known, tungsten carbide power is good conductor for electricity and heat. The sliding fit part and frequent strike of cemented carbide stamping die have been worn for long time in working process, it has an obvious influence on the mould quality.

The raw material of tungsten carbide powder has high hardness, strength, wear resistance and corrosion resistance. It is a very important factor to improve the mold quality. So that it easily to meet the quality requiment. People should also ensure the mold own enough strength while designing. Corner for each surface is designed into the fillet after filtering which can avoid the stress concentration. It can protect manufactured parts, concave die, cavity and part convex die. It has improved technological content of manufacturing products and high quality stability.

Chemical Reaction Value Of Tungsten Carbide Powder

Carbide tungsten powder plating bluish white, it is an alloy coating with good corrosion resistant. Carbide tungsten power is used for watch and bicycle part. They always own good weldable and very suitable for electronic components and printed circuit board. Adding cobalt and nickel electroplating gloss can make them plump. At the same time, it will improve the hardness of pure nickel layer, the lower contact resistance. So it can not only be regarded as protection and decoration coating, but also as mechanical plating, electroplate.

People have been studying alternatives and iron powder as the cemented carbide. Because the carbide tungsten power usually expensive and the resources are scarce. Now carbide tungsten power don’t need any payment technology. Due to radioactive of carbide tungsten power, the large amount of development work only made by more stronger enterprise. While whole development process is in large requires. Generally speaking, the tungsten carbide powder with radioactivity is harmful to human body. However as a strategic resource of a country, only master the development of tungsten carbide powder with high level cold keep it in the leading position in the world.

Adding special material to the metal carbide tungsten has important position in metal product industry. At present, tungsten carbide powder is essential in many nonferrous metals enterprises.

Metallurgy Of Tungsten Carbide Powder

In recent years, metallurgy technology of tungsten carbide powder developed rapidly. Sintered casting, temperature and pressure skills, injection molding, sinter hardening are used more and more widely. At present, powder casting is a primary forming skills in tungsten carbide powder metallurgy mechanical parts industry. Its shape has been changed by hot forging or cold forging. It has completed high density.

Chinese car and motorcycle market have very great potential. On one side, the motorcycle is still occupy the first market. But with a series of resolution and plan have been carried out, motorcycle market will be further expanded in the China West. On the other hand, the current national car market carried out another round of market competition.The revival and development of this occupation offered key point to tungsten carbide powder metallurgy.

From the international development trend, carbonized tungsten powder metallurgy gear can reduce the advantages of parts components and attracted more and more attention to the field due to its cheap price. For example, the number of each tungsten carbide powder metallurgy part in car has been increased quickly in the area of north America and Europe since 1990.

  

Improve Service Life Of Tungsten Carbide Die

Tungsten carbide die a kind of composite material that made by powder metallurgy method. Tungsten carbide has high hardness and good wear resistance. It owns high elastic modulus and working temperature. Tungsten carbide can made for som dies. While the service life of dies also could improved several times and even more than dozens of times. Tungsten carbide is regarded as die material, and is mainly used for drawing die, cold extrusion with little impact force and cold punching mold. At present, China can produce each types of tungsten carbide and basically meet the needs of the domestic market.

In order to improve the service life of tungsten carbide die, people had better pay attention to following tips.

Firstly, the selection of tungsten carbide die and hot treatment for insert all should obey the rule of national standards and specifications. At the same time, people who use the tungsten carbide die had better maintain it in time and ensure that the die steel will not be rust and alloy core oxidation. Secondly, structure of tungsten carbide die must be reasonable. Finally, it must be precise in the process of manufacture. And tolerances is required to control strictly.

Return Tungsten Processing Method

The sprayed surface need to remove after tungsten carbide body service and spray again. That could make the workpiece repaired. Ordinary  mechanical processing is difficult to remove tungsten carbide surface. Because hardness of tungsten carbide surface can reach about HV1400 which is too hard.

People usually adopt chemical method to remove tungsten. Such as hydrofluoric acid, nitric acid, hydrochloric acid. But these chemical substances is very harmful to the human body. High concentrations of hydrochloric acid can cause chronic poisoning, rhinitis, bronchitis, emphysema and other disease. Some will even get allergies, dermatitis, eczema and so on. Hydrochloric acid is very volatile and it can reaction with the water vapor in the air. Then forming hydrochloric acid fog and sodium hypochlorite. These are perishable goods and harm to human body, plants and animals. Certainly they have a damaging effect on the workpiece surface.

There is another method to remove tungsten without any harm to human body. While it is also non-toxic, environmental protection and in low cost. Firstly cleaning the tungsten carbide workpieces. Use cleaning fluid to clean the tungsten carbide workpieces and then use clear water to wash. Secondly Make the tungsten carbide workpiece clamped. So the tungsten carbide workpiece can rotatable fixed in the electrolysis groove. Thirdly prepare electrolyte and remove the coating. Finally washing the tungsten carbide workpiece with clear water.

Wear Principle Of Tungsten Carbide Balls

Tungsten carbide balls can made for shotgun cartridges. The shotgun cartridge is not same as ordinary cartridge. It is a ball full of something. The bullet is dispersed into many small balls when shoot from gun muzzle. Explosive power is acting on each balls. Every ball has lower energy. In the hunting activities, people are usually main for shooting birds or other small animals.

Mill ball produces amounts and relative sliding after it has loaded. The connect surface temperature of mill ball parts become rise and oxidation also become more quickly. From the test, we all know that the release energy in the process of fretting wear has been mostly used up with heating. Fretting wear area of mill steel ball often appear fatigue crack. But the contact stress is only produced in the shallow surface of the ball. And generally speaking, these crackles will no longer extension.

Fretting wear of the steel ball mill is difficult to eliminate completely. However take proper measures can reduce the wear degree. Such as reduce the fretting contact area, mill ball change to the whole structure, some of connect surface hardening, improve the ball tube finish, spray hard metal on the surface, improve the mill steel ball contact stress or increase the friction between the contact surfaces. Adding the material with high elastic strain limit can uptake fretting amplitude. This can  prevent the ball tube fretting wear.

Advantages And Disadvantages Of Tungsten Carbide Roll Rings

Tungsten carbide roll rings are also called hard alloy roll ring. They have good performance, stable quality, high precision processing and good  impact resistance and wear resistance.

Tungsten carbide roll rings have high hardness and its hardness variation with temperature is very small. Hardness value is four times of high speed steel at 700 ℃. But the elastic modulus, compressive strength, flexural strength and thermal conductivity are all higher than the tool steel more than one times. The hard alloy roll has high thermal conductivity, so the cooling effect is good. Hard alloy roll are more resistant to corrosion and thermal fatigue resistance than the tool steel roller.

Tungsten carbide roll rings have many advantages. Firstly they can improve the quality of steel products and make the surface quality and dimensional tolerances improved thoroughly. Secondly they can reduce replace times and down time. Certainly they can reduce the scrap rate and the labor intensity of the production workshop. Finally reduce the cost is an effective way for enterprises to increase.

However tungsten carbide roll rings have high sensitivity to crack and unable to withstand cold and hot with high hardness and big brittleness. Otherwise it easily to lead destructive accidents.

Tungsten carbide balls can made for shotgun cartridges. The shotgun cartridge is not same as ordinary cartridge. It is a ball full of something. The bullet is dispersed into many small balls when shoot from gun muzzle. Explosive power is acting on each balls. Every ball has lower energy. In the hunting activities, people are usually main for shooting birds or other small animals.

Mill ball produces amounts and relative sliding after it has loaded. The connect surface temperature of mill ball parts become rise and oxidation also become more quickly. From the test, we all know that the release energy in the process of fretting wear has been mostly used up with heating. Fretting wear area of mill steel ball often appear fatigue crack. But the contact stress is only produced in the shallow surface of the ball. And generally speaking, these crackles will no longer extension.

Fretting wear of the steel ball mill is difficult to eliminate completely. However take proper measures can reduce the wear degree. Such as reduce the fretting contact area, mill ball change to the whole structure, some of connect surface hardening, improve the ball tube finish, spray hard metal on the surface, improve the mill steel ball contact stress or increase the friction between the contact surfaces. Adding the material with high elastic strain limit can uptake fretting amplitude. This can  prevent the ball tube fretting wear.

Tungsten Carbide Blade Needs Improvement

The current machine development trend is high speed, high precision and high quality. High speed operation has more and more high requirement to mold, cutting tools, surface treatment. Prolong the service life, reduce the production cost and create higher profits are the common goal that the industry pursuit. The improvement of cutting tool has become an important factor in order to meet the high speed machining, save processing time and cost. Tungsten carbide blade has high wear resistance and hardness. You must choose the appropriate surface treatment to get best benefit from processing.
This part is usually used for cold forging punch, hydraulic drawing die, tungsten carbide wire drawing, pump tube. Titanium aluminum nitride with high aluminum content is very easy to be formed alumina dura on the surface. This film can make the oxidation temperature up to 923 degrees. And can protect tungsten carbide blade keep hardness under the high temperature. However titanium nitride and titanium carbon nitride will also generate titanium oxide film at high temperatures. It is not easy to adhesion in epidural.That make dura lack of protection, oxidation rapidly and degradation.
So no matter under high temperature or low temperature, the surface treatment of coating must choose appropriate thermal treatment  and stable substrates. And also with  grinding and precision polishing processing. At present super high temperature resin binder still can not meet the requirements of mass production tool fully. There is still room for the quantity and quality to further development.

Notes For High Tungsten Carbide Roll Ring

Tungsten carbide roll ring is a roll which is regard tungsten carbide and cobalt as materials and made by powder metallurgy method. There are some tips for using the tungsten carbide roll rings. Firstly the cooling water should be accurately rushed to the trough. Secondly you should check the groove wear after rolling. Finally stop to supply water until red steel completely finished or pile of steel rolling cooling.
When you need to change the tungsten carbide roll rings, you can change according to the following steps:
1.Review whether the specifications, roller diameter and processing of backup roll ring can meet production requirements.
2.Check all install equipment and tools to ensure they can work normally and carry the good roll rings to the assembly trolley.
3.Take the mill shaft protection sleeve after the mill stopped, use a hydraulic motor to change the roll ring. And remove it with special hoisting tool, then put to the assembly.
4.Use acetone and the cutting of toilet paper to clean mill shaft and roller ring gasket until clean without dirt.
5.After a reasonable set of roll gap, put the cleaning roller ring along the roller shaft and cone sleeve flat head until it touches the roll ring gasket.
6.Using special roller tool to make the roll ring pressing. The pressure indicated by  pressure gauge should be consistent in the removing and installing roll process.
7. Ensure the mill flush alignment of groove and has not been blocked.