March 16, 2018
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.
March 14, 2018
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
Low erosion rate
Provides additional cooling
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
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.
March 08, 2018
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.
March 02, 2018
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.
March 01, 2018
Tungsten carbide center drill is used for machining center hole on the end face of shaft and other parts. It is used for the prefabrication of hole processing to guide the hole machining and reduce the error. The center drill is light and defecate.
More and more processing workshops are replacing gun drilling with solid carbide bits. Some solid carbide drill manufacturers think, this kind of bit performance advantage for those who are on his lathe with gun drill deep hole processing, or the deep hole processing tasks subcontract processing workshops of gun drill manufacturers have more and more attractive. However, compared with the tungsten carbide center drill, which is usually made of hard alloy or hardened high speed steel drill point, hardened steel shank and straight slot, there are some limitations in the overall hard alloy deep hole drill. For example, their borehole depth limit (dimensioning) is 40 times the aperture, while a gun drill can easily drill a deep hole with a depth of 50 times the aperture.
There are two types of tungsten carbide center drill: type A: center drill with no cone, type B: center drill with A cone, and A center hole with A diameter of 1~10mm, usually with A center drill without A cone (type A); In order to avoid the damage of the 60-degree centering cone, the center drill with the cone is generally adopted.
Tungsten carbide center hole is the positioning base of the shaft type workpiece mounted on the top. Center hole of 60 degrees taper hole to match the top 60 degrees on the cone; A small round hole in the inner side to ensure that the conical hole is matched with the top cone, and a small amount of lubricating oil (butter) can be stored. The central holes are commonly found in type A and type B. Type A center hole only 60 degrees taper hole. Type B center hole outside the 120 degrees cone cone is also called the protection, to protect the 60 degrees taper hole edge is not being damaged. Type A and type B center holes are machined on lathe or special machine tool respectively with corresponding center. Before machining center hole, the end face of the shaft should be leveled to prevent the center from breaking. The peak Angle of the standard center drill is generally 118 degrees.
Instructions for use of alloy center drill
1. The user must choose the model of the center drill according to the holes of the processed parts and the size of the straight hole.
2. The hardness of the workpiece is best between 170-200hb.
3. Before using the tool, it must be cleaned and anti-rust grease, so as to prevent the cutting chip from sticking to the blade and affecting the performance.
4. The surface of the machined workpiece should be flat, and there should be no sand or hard points, so as to avoid the cutting of the tool.
5. The center drill before drilling should reach the desired position accuracy.
6. Cutting amount
7. Cutting fluid: select different cutting fluid according to the processing object, and the cooling should be sufficient.
8. Matters needing attention: the abnormal situation should be stopped immediately during processing, and the cause can be processed after checking the cause; Pay attention to the abrasion of the cutting edge; After using the tool, clean the oil and keep it properly.
February 09, 2018
In order to ensure the quality of welding, a careful inspection should be carried out to find out the cause of defects. Before the inspection, the tool should be sandblasted or gently ground to adhere to the solder and impurities on the blade surface, and clean with kerosene.
Check items and requirements.
Check weld strength
After the green silicon carbide grinding wheel is used to grind the back of the cutter, check the thickness of the solder layer, and the thickness is below 0.15mm. No holes and solder defects can be found at the base of the blade, and the welding seam should not be more than 10% of the total length of the weld. If there is a hole, the blade will fall off when cutting.
Check the position of the blade in the knife slot.
If the blade is misaligned and sagging exceeds the technical conditions, rewelding shall be performed.
Check welding strength
Use a wooden hammer or a copper hammer to hit the blade with medium strength or with a hammer with a strong stroke. The blade is not removed from the knife slot to be qualified. Check the welding strength of cemented carbide welding blade, not necessarily each inspection, also use spot check method.
Check the blade flatness
If there are obvious pits on the blade, the blade should be overheated and deformed, and the welding blade should be fired.
Check the crack
When the blade is cleaned by kerosene, if the blade is cracked, the kerosene seeps into the crack and the black line is visible to the naked eye. It can also be observed with a magnifying glass of 10-40 times.
Check the blade crack, and also use color flaw detection: 65% of kerosene, 30% of transformer oil and 5% turpentine solution, slightly more Sudan red. Put tool blade part in 10 to 15 minutes in the solution, then use clean water, coated with a layer of clay (kaolin), the surface was observed after baking thousand, if there is crack on the cemented carbide welding blade, then the color of the solution was revealed on clay, with the naked eye can see. The cracked blade cannot be used and needs to be resoldered.
In addition to the several commonly used car 7J welding methods mentioned above, there are methods such as oil protection, electric furnace, forge furnace and brazing furnace with reducing gas.
Related link: http://www.wococarbide.com/
February 01, 2018
Wire drawing die of the scope of application is very extensive, mainly for the drawing bar, wire rod, wire, pipe and other linear difficult processing object, steel, copper, tungsten, molybdenum and other metal and alloy material of drawing processing. As the material that can use tungsten carbide wire drawing die, must have enough strength and wear resistance. The molds of tungsten carbide wire drawing dies are basically WC-Co cemented carbide. WC-Co carbide is composed of very hard elements (tungsten carbide) sandwiched between very soft matrix (cobalt) layers. The most important element in cemented carbide is tungsten carbide. There is only a small amount of the matrix metal film, filled with the space of carbide grains. Since the thermal expansion properties of carbide and cobalt are different, when the matrix metal film is combined with hard particles, they are subjected to severe plastic constraints. This will increase the strength of the base metal and lead to embrittlement of the matrix metal. This actually determines the performance of the cemented carbide. At high temperature, tungsten carbide can still guarantee its hardness. When the temperature reaches 600 degrees, the hardness of cemented carbide can be the same as the hardness of high speed steel at room temperature. Hard metal has higher compressive strength than any kind of artificial material, and it also has high elasticity and rigidity modulus. Other properties of cemented carbide include thermal conductivity better than most steel and low friction coefficient. These characteristics are very important for the fabrication and processing of metal pipes.
The quality of tungsten carbide in tungsten carbide wire drawing dies plays an important role in the service life of wire drawing die. The design and manufacture of tungsten carbide wire drawing dies, if the service life is long, the maintenance is small, and the speed of drawing is improved, the following three problems must be solved:
1. The inlet cone and working cone are lengthened to establish a good lubrication pressure, while the lubricating cone Angle should be shortened appropriately.
2. The diameter belt must be straight, and its height should be reasonable.
3, work cone Angle and sizing belt junction should not have transition Angle, at least to minimize, typically less than 0.5 degree.
The tungsten carbide wire drawing mould is of high hardness, and the quality of the pipe is high and the surface roughness is low. At the same time, the wear resistance of tungsten carbide wire drawing die is good, the service life of die is long. The machining precision, durability and wear resistance of the tungsten carbide wire drawing die are better than that of ordinary pipe drawing dies.
Work drawing die is towards high strength, high hardness, high wear resistance, conforms to the requirements of the new technology and material emerge in endlessly, work drawing die greatly improve wear resistance, wear and damage time delay, obviously increasing life of drawing die, machining accuracy has improved. The application scope of drawing processing is gradually expanding, from coarse to fine specifications of pipes.
The physical and chemical properties of wire drawing die must meet the requirements of high hardness, impact resistance, wear resistance and low friction coefficient. In mass production, long life die materials should be selected, such as tungsten carbide, high strength and toughness, high wear-resistant mould steel (such as YG15, YG20). tungsten carbide has good polishing, low energy consumption, wear-resisting, high temperature resistance, good corrosion resistance, and its recyclable and other excellent properties, making it an important material for drawing mould.
January 24, 2018
Tungsten alloy plates are refractory metal, which have two-phase composites consisting of W-Ni- Fe or W-Ni- Cu or even W-Ni-Cu-Fe, some tungsten alloys also contain Co、Mo、Cr, etc. Tungsten alloy can be machined into various shapes, such as rods, cubes, blocks, bricks, rings, plates, etc.
Applications for Tungsten Alloy Plate:
1) Sports goods: Professional tungsten alloy plate for darts benchmarking. The to fall series: the bullet type, type water, pipe type, half water droplets type, type cylinder have.
2) Counterweight products: High-density tungsten alloy plates with counterweight series: with the balance of mechanical hammer; Fly hammer; Oil drilling counterweight rod; Darts rod; Golf counterweight piece; The car counterweight piece; mobile phones, game oscillator; aerospace the gyroscope; The pendulum clocks; counterweight balance ball; Shockproof tool rod.
tungsten alloy plate
3) Electrical material: electrical discharge machining of electrode and resistance welding electrode; high proportion electrical contacts, air circuit breaker in the contacts.
4) High temperature alloy heat sink: due to high temperature resistant and good thermal performance, electronics industry isswitching to tungsten alloy plates as heat sink materials.
Tungsten Alloy Plate Introduction
Tungsten Alloy Plates properties
1, Width*Length: (2.0-250.0mm)*(2.0-250.0mm)
2, Thickness: 2mm-15mm
3, Density: 15.8-18.75 g/cm3
4, Composition: W content: 85-99%, W-Ni-Fe, W-Ni-Cu
5, Surface: Sintering surface, Forged surface, Ground surface
Tungsten alloy plates are produced by good processing property billets and special cold and hot rolling technology; they can be used to make tungsten target, tungsten heat elements, tungsten radiation shields and tungsten boats for electronics, lightening, electro-vacuum industries.
Tungsten alloy plates play very important role in manufacturing of collimator for nuclear medicine, nuclear research, geologging and homeland security. These materials provide reliable protection against X-rays and gamma radiation.
The thickness of the tungsten alloy plate is as follows:
Foil - a thickness of less than 0.005 in. (0.13 mm).
Plate - thickness greater than or equal to 0.188 inches (4.75 mm).
Sheet - thickness less than or equal to 0.187 inches (4.75 mm) to greater than or equal to 0.005 inches (0.13 mm)
January 19, 2018
January 18, 2018
January 16, 2018
January 12, 2018
Tungsten carbide geological mining tools are made of WC-Co alloy. According different geological mining tools, different rock hardness, or in different parts of the geological mining tools, requiring an average WC grain and containing cobalt are also different . Tungsten carbide geological mining tools material in addition to the requirements of high purity, and require WC, C particles are generally coarse, for WC total carbon and free carbon, there are strict requirements range. tungsten carbide geological mining tools has formed a relatively stable and mature production technology, widely used as a molding agent paraffin wax, vacuum dewaxing (and hydrogen dewaxing) and vacuum sintering.
Tungsten carbide geological mining tools take on the important task of engineering geology, oil exploration, mining and civil construction. Tungsten carbide geological mining tools as traditional geological mining tools, geological mining tools by the complex role of impact and abrasion, harsh working conditions, there are at least wear mine rock form more than four, namely: thermal fatigue wear, shock wear the shock of fatigue wear and abrasive wear. tungsten carbide geological mining tools compared with the general geological mining tools, have higher hardness, strength and toughness. tungsten carbide able to adapt to changing conditions better,and under the guarantee toughness does not fall have further improve the wear resistance of the alloy.
tungsten carbide bits as the common part of tungsten carbide geological mining tools, one tungsten carbide bit can replace 4 to 10 steel bits, its penetration rate twice as high, while the tungsten carbide drill bit replacement less often, improve production efficiency, perforation rate. Tooth tungsten carbide drill for, it is required to adapt to a variety of rock properties teeth, perforation rate, abrasion resistance, shock resistance, so as to achieve long service life. Tungsten carbide drill bit has become a major tool for high-efficiency perforated. Currently tungsten carbide geological mining tools for large and medium-sized open-air metal mines, especially for large open pit type non-ferrous metal perforation, tungsten carbide geological mining tools has broad prospects.
Selection of tungsten carbide geological mining tools
Tungsten carbide geological mining tools have high hardness and excellent wear resistance and heat resistance of some, but it is a very sensitive to surface cracks or defects, poor performance of the anti-shock cold quasi-brittle materials; its compressive strength is high, but the tensile strength is very low. Meanwhile, the stress concentration is also very sensitive. Selection of geological mining tools with tungsten carbide grade, should be the main consideration alloy shock resistance and abrasion resistance. Various items of property flexural strength, hardness, density, coercive force, fracture toughness, porosity, dirt degrees, the average grain size of tungsten tungsten carbide , etc., can reflect different aspects of shock resistance and wear resistance of the alloy.
Selection tungsten carbide geological mining tools, the shock of extremely hard rock and heavy drills big power should focus on the toughness of the tungsten carbide alloy, the choice of a higher amount of cobalt-containing tungsten carbide alloy grades; for hard and brittle, and the corrosive rock, should focused on the wear resistance of the tungsten carbide alloy, the choice of a slightly lower amount of cobalt tungsten carbide alloy grades; on the hard and medium hard rock below, should use low cobalt-containing, high hardness tungsten carbide alloy grades; for use under heavy mining coal mining tungsten carbide cutter used mainly to reduce the cobalt content increased, grain size so that the shock toughness of the alloy greatly improved flexural strength; for column teeth, cross, three-blade drill head is the choice of the cobalt-containing lower amounts of tungsten carbide .
January 11, 2018
January 04, 2018
Tungsten alloys can be made in various shapes, but the most commonly used shape is a round bar, which can be treated with thermal machinery to improve its mechanical properties. The tungsten alloy rotary forging stick is made of tungsten alloy rodsthrough forging, thus greatly increasing its tensile strength, and its strength is at least 1050 MB to 1200 MB. Tungsten alloy spinning rod is formed by extrusion and sintered tungsten carbide powder. Sizes range from 3mm to 50mm.
The tungsten alloy bars are mainly made from square and round tungsten alloys. The hollow tungsten alloy bar is one of the important types of tungsten alloy bars. Tungsten alloy rod machining process, tungsten alloy rod is hollowed out by a single point cutting tool, in order to realize a bigger hole, such as boring and artillery barrel diameter precision of hole or holes, it can also be used to cut a tapered hole.
Tungsten alloy bars can be divided into several types. At both ends of the tungsten carbide, this is just working. If the existing hole is a pass hole, it can be supported at one end and can be supported. The hollowed-out tungsten alloy bars are made through existing holes, then in the "back" work, while hollowing out the process. The tungsten bar is formed by pressing the burning and then rolling. Smaller dimensions are made from subsequent drawings. The rod has various direct lengths, the diameter of the surface forgings is generally 3 mm or more, and the finished product is generally below 3 mm. A non-central product can also be provided. It can also provide specific length and special components according to the requirements.
Tungsten alloy bars are widely used and popular
These kinds of rods can be further processed, usually used to make the balance weight, radiation shielding, military defense equipment, welding rod, extrusion die, also used in some sport, such as darts, steel billet, golf clubs, etc. in addition, we can produce and provide tungsten rods as Anviloy 1150 counterparts, nature is very similar between them. Due to its high density, high melting point, small capacity, good hardness, excellent wear resistance, high tensile strength, tungsten alloy bars are more and more popular.
Related link: http://www.wococarbide.com/Library/index.html
December 29, 2017
December 28, 2017
It is understood that in September 2017, the total output value of Japanese knives is about 34.143 billion yen, which is an increase of 8.4% from 315.04 billion yen in August, compared with 32.596 billion yen in the same period in 2016.
In addition, in the third quarter of 2017, the total number of Japanese carbide cutter output was about 99378 million yen, a 3.8% increase from the previous month, with the carbide cutting tool of 67.959 billion yen and 19.5%. High-speed steel tools were 218.88 billion yen and 28.2 percent less. Diamond cutter 28.8.3 billion yen and 12.2%; The cubic boron cutter was 6648 million yen,up 15%.
In September, the output value of Japan's carbide cutting tool was 23.271 billion yen, up 1.08% from the previous month and 20% year-on-year. The production value of high-speed steel tools was 75.79 billion yuan, up 9.1% from the previous year and 26.6% year on year. Diamond tool output is 10.07 billion yen, up 14% from the previous year and 10.3% year on year. Cubic boron cutter is worth 22.86 billion yen. Growth was 11.7 per cent quarter-on-quarter and 16.4 per cent year-on-year.
In the first nine months of 2017, the total number of Japanese bladeproduction was about 295.31 billion yen, up 0.2% year on year. Among them, the accumulative total of hard alloy knives is 14.5 billion yen and 14.5%. High-speed steel cutter 66.28 billion yen and 28.5%; Diamond cutter 8435 million yen and 6.7%; Cubic boron cutter was 19348 million yen and 5.3 %. It appears that the high speed steel cutter is a significant drag on the growth of the entire tool industry.
High speed steel cutter is a kind of toughness than ordinary knives, easier to carbide cutting tool, used to drill, tap, saw blade and hob, pinion cutter, broach and other precision cutting tools, especially suitable for manufacturing complex thin blade and impact resistance of metal cutting tools. In 1923, the emergence of the carbide makes the cutting speed increased to more than one hundred meters to hundreds of meters per minute, and its hardness is higher, which can be processed by high speed steel cutting materials, and with the constant improvement in recent years, the performance of cemented carbide, carbide cutting toolsgradually eroded the market share of high speed steel tools. Then there are more advanced cutting tools, such as ceramics, cubic boron and synthetic diamond, and they are more rigid and resistant than hard alloys.
High speed steel tools have excellent strength and toughness, while tungsten carbidecutting tools are superior in hardness and red hardness (the ability to maintain hardness under the cutting temperature). Generally, the cutting speed of the solid carbide tool can reach at least four times the cutting speed of the high speed steel cutter, and the tool life is longer. However, compared with high speed steel tools, the fracture toughness of hard alloy cutter is poor, which limits its application in certain machining areas, especially tapping.
For more details: http://www.wococarbide.com/Transaction/en_information.html
December 22, 2017
Carbon and graphite compounds are used for standard bearings, which have excellent corrosion resistance when working in most liquid environments.
Some liquid containing solid abrasives will hinder the binder or process and affect the use of graphite bearings. Alternative materials in this case, such as:
Cemented carbide bearings
A cemented bearing is a bearing made from a hard alloy. Tungsten carbide bearing has the characteristics of super high wear resistance and high impact resistance. The surface and inner hole of the cemented carbide bearing can achieve the mirror effect.
Carbon graphite bearing
Carbon graphite is a kind of graphite bearing material with high temperature resistance and certain self lubricating function. Its most significant advantages are high temperature stability and strong chemical corrosion resistance. In the early stage of development of graphite bearing, especially in strong corrosive medium or high temperature environment, carbon graphite has been used as bearing material and has been applied to some extent. With the progress of the powder metallurgy industry and the maturity of the impregnation process, the new impregnated graphite bearing has gradually replaced carbon graphite with its excellent properties.
Although the pure carbon graphite corrosion resistance and high temperature resistance is relatively high, but as bearing materials, flexural strength, compressive strength and its impact performance is poor, this is mainly due to its relatively large porosity (about 10% ~20%), and these are not impregnated filling holes, there is no play the reinforcing effect. But in some special occasions, the working medium is strongly corrosive, or because of the size of the structure, it is impossible to set up the heat shield without shielding the load.
Silicon carbide bearing
Carborundum belongs to ceramics, and most of the general ceramics now refer to ceramics other than carbon. Such ceramics are mainly Si3N4 and SiC, and their hardness is very high. The hardness of the SiO2, whose composition is mainly composed of sediment (HV800~1 000), is higher. Therefore, it has strong adaptability to impurities. The disadvantage is that the impact resistance is poor, but the measures can be taken to a certain extent according to the bearing structure.
Imported silicon carbide has been applied in many fields because of its high hardness, high temperature creep, high wear resistance, corrosion resistance and oxidation resistance. Silicon carbide can be divided into three kinds, such as high pressure sintering, pressure free sintering and reaction sintering, according to the different sintering methods. At present, the pressure free silicon carbide (SIC) has been widely used in shielded motor because of its high wear resistance and low friction coefficient. Under the condition of water lubrication, silicon carbide can produce a film of silicon dioxide and silica gel on the surface to further reduce the friction coefficient. The silicon carbide itself has the function of self lubrication, which is suitable for the material of friction. However, because of the high hardness of silicon carbide, the impact toughness is relatively low, and the fracture toughness of SiC without pressure sintering is only about 3~4MPa. M1/2. It is not suitable for the shock vibration condition, the silicon carbide as bearing material used in motor, in addition to the selection of spraying surface (or welding) of tungsten carbide grinding parts as friction pair, but also for special design in structure, set up special measures should be to force groove, to prevent silicon carbide by the impact have broken. At the same time, when silicon carbide is used as a bearing material to shield motors, the conveying medium must be clean and free of impurities, and requires stable operation and no vibration. Therefore, silicon carbide as a bearing material has greatly improved the friction life of tungsten carbide bearings. However, under the condition of high reliability, especially the shielded motor used for military and nuclear power, there are few uses of silicon carbide as bearing material, and the reliability needs further study.
This material is very similar to silicon carbide in abrasion resistance and corrosion resistance. However, it is also easily affected by the temperature adjustment and the impact of the operation of the machine.
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December 20, 2017
Hot spraying ceramic powders include oxide, carbide, boron, nitride and silicide, which are crystalline or non-crystalline compounds of metallic elements and non-metallic elements. Ceramic coating has the characteristics of high melting point, high hardness and good wear resistance, corrosion resistance and high temperature stability. However, the coating process is complex, the cost is higher, and the coating surface is prone to crack, the thermal fatigue performance is not as good as the metal coating. Moreover, the coating has poor toughness and can not be used to withstand large impact load. Currently, the commonly used ceramic coatings are A12O3, TiO2, Cr2O3, ZrO2, WC, TiC, Cr3C2, TiB2, etc., which are usually prepared by plasma spraying, flame spraying, HVOF and explosive spraying technology.
Plasma spraying A12O3-40% TiO2 and Cr2O3 sliding friction and wear properties of ceramics powder coating is pointed out that the wear resistance of coating Cr2O3 higher than A12O3-40% TiO2 coating, the wear mechanism of Cr2O3 coating are mainly abrasive wear and tear, under the large load, Cr2O3 coating wear characteristics of brittle fracture. The abrasion mechanism of a12o3-40% TiO2 coating is mainly characterized by plastic deformation and laminar stripping. Study of A12O3 plus TiO2 and NiCrAlY composite ceramic coatings, due to the melting of TiO2 and A12O3 formed a certain degree of miscibility, can decrease the coating porosity, further improve the strength, toughness and wear resistance of the coating.
Lin et al. studied the wear and tear characteristics of plasma spraying multi-layer metal and ceramic coating. The thermal spraying sequence was first sprayed on the base with NiCr on the bottom layer, then the nicr-cr2o3 transition layer of different proportions, with a surface of 100% Cr2O3. It is found that the transition layer of suitable metal and ceramic ratio can improve the wear resistance of the coating. The main wear mechanism of coating is brittle fracture, abrasive wear, adhesion and oxidation wear.
Metal and the excellent properties of ceramic materials have their unique and significant performance weakness, how to put the metal and ceramic materials combine their advantages performance, has been the direction of materials science and engineering research. Metal ceramic composite hot spraycoating technology, namely in the plastic substrate evenly distributed on the particle shape and size of the appropriate size ceramic phase, successfully integrate the advantages of metal and ceramic, the preparation of both strength and toughness, metal and ceramic advantages of high temperature resistance, wear resistance, corrosion resistance of composite materials, greatly expanded metal materials and ceramic materials, their application scope, in aviation, aerospace, chemical, mechanical, electrical and other industrial applications successfully. The most widely used metal ceramic coatings in industry are: Cr3C2- NiCr, WC- Co. HVOF, plasma and explosive spray are used in the process.
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December 13, 2017
December 08, 2017
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