March 01, 2018

Tungsten carbide center drill

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.

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February 09, 2018

How to check the quality of cemented carbide welding blade?

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.

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February 01, 2018

Product advantage of tungsten carbide tube drawing dies

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.

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January 24, 2018

Application in various fields of tungsten alloy plates

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 CoMoCr, 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)
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January 19, 2018

Analysis of the characteristics and principles of thermal spraying

Thermal spraying is to point to a series of process, fine and dispersed metal or nonmetal coating material, in a molten or semi-molten state, deposit to a after the preparation of the substrate surface, forming a spray deposit. It USES a heat source (such as arc, plasma spraying and combustion flame, etc.) will be powder or filiform metal or nonmetal material heated to melt or half molten state, and then with the help of a flame itself or compressed air injection at a certain speed to the pretreatment of substrate surface, deposit formed by surface coating of a kind of technology with a variety of functions.
Characteristics of thermal spraying technology:
1. The matrix material is not restricted, can be metal and non-metal, can be sprayed on various matrix materials;
2. The coating materials can be sprayed widely, and thermal spraying technology can be used to spray almost all solid engineering materials, such as hard alloy, ceramic, metal, graphite, etc.
3. In the process of thermal spraying, the substrate material temperature rise is small, without stress and deformation;
4. Thermal spraying operation is flexible and easy to operate.
5. Thermal spray coating thickness can range from 0.01 to a few millimeters;
6. The thermal spraying coating has various properties, which can form a coating with various special functions such as abrasion resistance, corrosion resistance, heat insulation, oxidation resistance, insulation, conduction and radiation protection.
7. Thermal spraying adaptability and economic benefits are good.
Principle of thermal spraying, thermal spraying refers to a series of process, in the process, subtle and dispersed metal or nonmetal coating material, in a molten or semi-molten state, deposit to a after the preparation of the substrate surface, forming a spray deposit. The coating material can be powder, ribbon, filaments or stick. Thermal spray gun is provided by fuel gas, or electric arc plasma arc necessary quantity of heat, heat the thermal spraying material in plastic state or molten, again through the acceleration of compressed air, make a constrained particle beam impact to the substrate surface. The particles that impact on the surface are deformed by stamping, forming laminated sheets that adhere to the prepared substrate surface, cooling and piling up, eventually forming a layered coating. The coating can achieve high temperature corrosion resistance, wear resistance, heat insulation and electromagnetic wave.
Thermal spraying material: spraying powder occupies a very important position in the whole hot spray material. Thermal spraying alloy powder includes nickel base, iron base and cobalt alloy powder, and is applied to repair and protection of mechanical parts according to different coating hardness.
Thermal Spray Application
That under the action of high-speed airflow of atomized into fine droplet particles or high temperature, at high speed jet to the treated surface, form a solid layer, so that the workpiece surface with different hardness, wear resistance, corrosion resistance, heat resistance, oxidation resistance, heat insulation, insulation, conductive, seal, disinfection, microwave radiation, and other various special physical and chemical properties. It can repair the old and waste in the maintenance of the equipment, and make the scrapped parts come back to life; It can also be strengthened and pre-protected in new product manufacturing to make it "live longer."

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January 18, 2018

Tungsten carbide round rods

Carbide rods, also known as tungsten carbide bar, It is a kind of tungsten carbide (WC) as the main raw material, combined with other precious metals and paste phase by suppressed by adopting the method of powder metallurgy sintering of high hardness, high strength alloy material, widely used in national production and processing fields, such as tungsten steel drill bits.
Carbide rod, as a new technology and new material. Its main features are stable mechanical properties, easy to weld, high wear resistance and high impact resistance. It is mainly used in the manufacture of metal cutting tools, wood, hardness and abrasion resistant products.
Tungsten carbide round rods blank process.
Pulverizing to formula according to the requirements of USES, the wet and dry mix - crushing - and sieving to join after forming agent, then to sieve made the mixture, drying granulating to suppress - molding - low pressure sintering, molding (blank) and external circular grinding fine grinding (blank without this procedure) to detect size, packing and warehousing.
Properties of carbide round rod material properties.
1. High quality ultrafine tungsten carbide and imported cobalt powder are used as raw materials.
2. Adopt the world advanced low-pressure sintering technology for standardized production.
3. High strength and high hardness.
4, has the extremely good red hardness, good abrasion resistance, high elastic modulus, high bending strength, good chemical stability, acid, alkali, high temperature oxidation), corrosion resistance, good impact toughness, low expansion coefficient of thermal conductivity, conductive characteristics of similar to iron and its alloy.
5. Advanced and advanced equipment: Germany imported 10MPa low pressure sintering furnace sintering.
6. Unique new process: vacuum high pressure sintering. In the final stage, the product adopts pressure sintering, which greatly reduces porosity, improves compactness and greatly improves mechanical properties of products.
7. Product features: there are many materials, which can be used for different purposes; Complete specifications, the blank size precision (reduce the processing quantity, improve the production efficiency).
8. Quick service: quick delivery, quick delivery and prompt delivery.

Tungsten carbide round rod application
Carbide rods application scope is widespread, applicable to the production of tungsten steel drill bits, the tiny bit of PCB industry, electrode rods of photoelectric communication industry, machinery processing industry carbide drill, drill shank, top, push rod, wear-resisting precision parts, CNC milling cutter and the whole belt hole machining tool choice high quality material, etc.

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January 16, 2018

Tungsten carbide sandblasting nozzle

Generally, the materials including steel, cast iron, Tungsten carbide sandblasting nozzle are produced. At present, most factories use steel spray nozzles, and a few are made of ceramic sand jet nozzles, but these two shotcrete nozzles have short service life and are not ideal. Under the action of high speed sand, the inner hole gradually wears out or becomes a flared mouth, which can not be used continuously. Hard alloy sandblast nozzle, also known as tungsten steel shotcrete. Hard alloy sandblasting nozzles with high hardness, high strength, corrosion resistance, high temperature resistant and low expansion coefficient, and a series of excellent features, at the same time, the wear-resisting performance is good, service life is long, compared with the steel sand blasting nozzle, 20 ~ 25 times can be improved.
Sand blasting is the motive force of compressed air or abrasive pump, which can be sprayed on the surface of parts by spraying gun to achieve the purpose of cleaning and finishing. Currently, sandblasting technology is widely used in machinery, petroleum, chemical industry, automobile, ship, aerospace, metallurgy, glass, coal and other industries. Sand blasting nozzle is the main wear resistant components in the sandblasting equipment, with a variety of dry or wet sand blasting machine, surface strengthening, surface cleaning, surface coating, surface modification and jet cutting one of the key components of machinery and equipment. Hard alloy sandblasting nozzles with high strength and toughness, good thermal conductivity, the hardness of cemented carbide is higher than the metal material, hard alloy sandblasting nozzle erosion rate is smaller than metal material, the erosion resistance higher than metal sand blasting nozzle, is the ideal choice of the blasting nozzle material.
The failure mode of the hard alloy sandblast nozzle.
Erosion wear is main failure form of tungsten carbide sandblasting nozzle, it refers to a solid surface with liquid containing solid particles, the contact of relative movement, the loss of the surface material, with solid particles of fluid can be high speed air flow, also can be fluid flow, the former produce spray sand erosion, the latter is called type slurry erosion. Hard alloy sandblasting nozzles wear belongs to the low Angle of erosion (15 or less) of erosion wear. The effect of erosion and wear behavior of many factors such as environment parameters (such as the Angle of attack, the erosion speed, the erosion of time and temperature, etc.), abrasive performance (such as hardness, particle size and shape, etc.), the performance of target (such as hardness, fracture toughness and microstructure structure, etc.

Structure classification of tungsten carbide sandblast nozzle.
1. Straight hole tungsten carbide sandblasting nozzle. Its internal structure is only the contraction section and the straight section, the structure is simple, easy to make. This type of nozzle cannot overcome the eddy current phenomenon in the inlet side, the pressure loss is large, and the abrasive outlet speed is less than 100m/s under the pressure condition of 0.7mpa. Generally used in small sandblasting equipment.
2. Venturi carbide sandblast nozzle. The structure of venturi nozzle is divided into three parts: contraction section, flat section and diffusion section. The working efficiency is 15% to 40% higher than the straight hole nozzle, and the abrasive consumption is reduced by 20%.
3. Double vented carbide sandblast nozzle. It is composed of two nozzles before and after, and the area of sandblasted area is 35% larger than that of the standard wenner nozzle, and the outlet speed of sandblasting medium is reduced. This nozzle is usually used for surface treatment of large areas of moderate strength.
4. Angle hard alloy sandblasting nozzle. Make the movement direction of the abrasive flow changes, can be used to clean the Bridges, towers and other steel structure truss, the pipe inner surface, makes it hard for the cleaning of parts can be directly hit by abrasive, achieve the purpose of cleaning.
Application of tungsten carbide sandblast nozzle.
Tungsten carbide shotcrete nozzles are mainly used for oil drilling, aircraft, ship, automobile, bridge, construction engineering, railway and other fields of coating engineering and surface treatment. Sand blasting can be divided into dry sandblasting and wet sand blasting. Its sand grains are quartz sand, carborundum and river sand, among which quartz sand application is the most common. Hard alloy sandblasting nozzles are cleaning, decontamination products, mainly used in ships, Bridges, water conservancy, machinery, chemical industry, container, pipe and other large equipment and parts surface sand blasting, rust removal, decontamination treatment. The hard alloy sandblast nozzle has the characteristics of high strength, high hardness and high wear resistance. The hardness (HRA) of hard alloy sandblasting nozzle (HRA) is 89-93, with a density of 14.4-15g/cm3, and the bending strength is not less than 1500Mpa. Hard alloy is the most widely used nozzle material. Its wearability is obviously better than alumina ceramics, and it can be used for hundreds of hours and is widely used in various structure sandblasting nozzles.

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January 12, 2018

Tungsten Carbide Geological Mining Tools

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 .

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January 11, 2018

Application environment and application scope of tungsten carbide bushing

tungsten carbide bushing with tungsten carbide powder as main raw material, at the same time with cobalt powder as binder and then mixing injection mould pressing sintered and eventually into corresponding, therefore tungsten carbide bushing with the tungsten carbide material of high hardness and high bending strength, wear resistance and corrosion resistance and its also spoke highly of by the user, widely used in various industrial fields.

In order to cater for the use of customers in different fields, tungsten carbide bushing can be made of different carbides. According to different binder, the tungsten carbide plate number is mainly divided into YG series and YN series. Generally speaking, the YG series cemented carbide bushing has higher flexural strength, while YN series cemented carbide bushing has better corrosion resistance than the former.
According to the different application ranges, we manufacture of cemented carbide liner usually has a high precision size, is also due to their high precision grinding degree, size precision, high wear resistance and corrosion resistance, tungsten carbide bushing is widely by many domestic and foreign customers praise.
In addition, due to the different use environment of cemented carbide bushing, there are several types: tungsten carbide bushing, tungsten carbide guide sleeve and tungsten carbide drill sleeve, etc. According to the customer's design drawing, we can customize the tungsten carbide liner to meet the user's different usage environment.
tungsten carbide bushing in terms of stretching, mainly some stretching, copper, stainless steel parts by using frequency is too high,it’s easy to heat, wear bushing, thus make blunt needle movement, product size error, and the bad appearance of the products.
With the improvement of oil production, the superficial surface oil reduce, in order to ensure that oil consumption of people gradually to the deep well, high Angle Wells, but gradually increased the difficulty of the drilling for oil and therefore the exploitation of oil components requirements with good wear resistance, corrosion resistance and impact resistance, etc.
tungsten carbide bushing as wear parts in the mechanical oil Wells, with high hardness, good wear resistance, smooth finish higher performance, already more and more widely applied in modern society, satisfied the need of daily and special performance. Some enterprises adopt spray welding technology to improve the durability and service life of cemented carbide bushing.
After spray welding of cemented carbide liner to HRC60 hardness, wear resistance is better, can meet the application requirements of petroleum machinery industry, but the tungsten carbide bushing need to spray after welding turning processing, in order to guarantee the size of the drawings and accuracy requirements.

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January 04, 2018

Tungsten alloy bars are widely used and popular

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.

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December 29, 2017

Tungsten carbide saw tips

Tungsten carbide saw tips is used as the raw material of hard alloy. It is usually used to weld the saw blade to enhance the strength of the tool while extending its service life and has wide application. Hard alloy material has the characteristics of high hardness and high wear resistance, thus carbide blade in the process of tool also shows high toughness and greatly prolong the working life of the cutting tool processing, compared with other materials of the saw tooth favored by more users.

Carbide blade high wear-resisting performance, users in the use process often need to change, and the cutting tool on the equipment when high speed machining is not easy to loose, which greatly improves the cutting tool machining efficiency and quality. In addition, according to the different application environment, the hard alloy blade can be made of different hard alloy plate number. The international brand is mainly used in the number of K10 to K30. Some users can apply the coating of other materials on the saw tooth surface to enhance the hardness of hard alloy, and can greatly enhance the strength of the saw tooth in some way.

Hard alloy serrated is used to prolong the service life of the cutter, but some users do not recommend hard alloy as the piece material of the saw blade. The main reason is the cost, although the hard alloy products have high cost performance. In addition, hard alloy materials are more fragile than other materials such as steel. So they consider adopting steel for saw blade body, so the blade is not easy to break or split phenomenon in the process of machining, and better performance of hard alloy blade, the blade has greatly increased the efficiency. According to relevant data, the processing edge of hard alloy sawtooth can grow to 10~20 times than that of steel.
Maintenance and maintenance of tungsten carbide saw tips
Grinding in time is very important, because the passivation of tungsten carbide saw tips edge at work, because the resistance increases, easy cause blade jitter, increases the motor load at the same time, the saw blade and the machine will cause damage. Continue cutting at the time of grinding, with each additional 10% of the cutting, will bring an additional 50% of the alloy damage and shorten the service life of the saw blade. Must be regularly remove gathered in the resin on the side of the sawtooth, debris and other sundry, because of the steady accumulation of gelling material, will increase the resistance, causing energy-intensive (extreme cases, can cause the machine motor burning) and rough cutting quality. If the blade is blunt at the same time, it is possible to cause sawtooth damage. When stored, should be placed separately, not superimposed and placed on metal objects, preferably in the original carton, so that it can be moved and removed.
Repair for tungsten carbide saw tips
With sophisticated, stable and no vibration grinding machine blade, and suitable diamond grinding wheel, in accordance with the prescribed procedures to repair in head of gold, will extend the service life of saw blade, please do not use manual grinding equipment. Before grinding, you must wash away the resin, debris and other sundries that are glued to the saw blade.

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December 28, 2017

Carbide cutting tools output increased sharply in Japan

It is understood that in September 2017, the total output value of Japanese knives is about 34.143 billion yen, which is an increase of 8.4% from 315.04 billion yen in August, compared with 32.596 billion yen in the same period in 2016.


In addition, in the third quarter of 2017, the total number of Japanese carbide cutter output was about 99378 million yen, a 3.8% increase from the previous month, with the carbide cutting tool of 67.959 billion yen and 19.5%. High-speed steel tools were 218.88 billion yen and 28.2 percent less. Diamond cutter 28.8.3 billion yen and 12.2%; The cubic boron cutter was 6648 million yen,up 15%.


In September, the output value of Japan's carbide cutting tool was 23.271 billion yen, up 1.08% from the previous month and 20% year-on-year. The production value of high-speed steel tools was 75.79 billion yuan, up 9.1% from the previous year and 26.6% year on year. Diamond tool output is 10.07 billion yen, up 14% from the previous year and 10.3% year on year. Cubic boron cutter is worth 22.86 billion yen. Growth was 11.7 per cent quarter-on-quarter and 16.4 per cent year-on-year.


In the first nine months of 2017, the total number of Japanese bladeproduction was about 295.31 billion yen, up 0.2% year on year. Among them, the accumulative total of hard alloy knives is 14.5 billion yen and 14.5%. High-speed steel cutter 66.28 billion yen and 28.5%; Diamond cutter 8435 million yen and 6.7%; Cubic boron cutter was 19348 million yen and 5.3 %. It appears that the high speed steel cutter is a significant drag on the growth of the entire tool industry.


High speed steel cutter is a kind of toughness than ordinary knives, easier to carbide cutting tool, used to drill, tap, saw blade and hob, pinion cutter, broach and other precision cutting tools, especially suitable for manufacturing complex thin blade and impact resistance of metal cutting tools. In 1923, the emergence of the carbide makes the cutting speed increased to more than one hundred meters to hundreds of meters per minute, and its hardness is higher, which can be processed by high speed steel cutting materials, and with the constant improvement in recent years, the performance of cemented carbide, carbide cutting toolsgradually eroded the market share of high speed steel tools. Then there are more advanced cutting tools, such as ceramics, cubic boron and synthetic diamond, and they are more rigid and resistant than hard alloys.


High speed steel tools have excellent strength and toughness, while tungsten carbidecutting tools are superior in hardness and red hardness (the ability to maintain hardness under the cutting temperature). Generally, the cutting speed of the solid carbide tool can reach at least four times the cutting speed of the high speed steel cutter, and the tool life is longer. However, compared with high speed steel tools, the fracture toughness of hard alloy cutter is poor, which limits its application in certain machining areas, especially tapping.

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December 22, 2017

Tungsten Carbide Bearings with wear prevention and corrosion resistance

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:

silicon carbide

Carbon graphite


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.

Alumina bearing

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

Research status of hot sprayed wear-resistant coating technology

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

Particle size classification of WC powder and its industrial application

Tungsten carbide powder (WC) is the main raw material, the production of cemented carbide with tungsten metal powder and carbon black as raw material, the mixture in a certain proportion, the mixture into graphite boat, placed on a carbon tube furnace or high sense of intermediate frequency electric furnace, carbonized under a certain temperature, then through the ball mill, screening for a quick tungsten carbide powder.
The tungsten carbide powder is a dark grey powder which can dissolve in many kinds of carbides, especially in the carbonized titanium, which forms the TiC-WC solid melt.
Tungsten carbide powder is used to produce hard alloy.
Packaging for WC powder
Generally use inside plastic bag seal, outer iron bucket package, net weight of no more than 50kg.
Inspection standard
According to gb4324-84, the analysis method of the chemical composition of the chemical composition of the chemical composition of tungsten carbide powder was carried out in accordance with gb4324-84. The average particle size was carried out in gb3249-82, and the sampling method was carried out in accordance with gb5314-85, and the main content (WC) was calculated by differential subtractive method.
The first tungsten powder was produced by chemical purity. Japan has formulated the industrial standard for tungsten powder and WC powder (jish2116-1979). Britain, France and the former Soviet union have unified national standards for tungsten powder. The technical conditions for hydrogen reduction tungsten powder was formulated in 1982 by the tungsten powder of Chinese industrial production (gb3458-82). The standard defines the performance and classification of the tungsten powder. And the inspection methods, acceptance rules, packaging, transportation and storage have been clearly defined. For special use and for the special purpose of the tungsten powder, the production plant can be produced according to the requirements of the user.
Industrial Application
Tungsten powder is the main raw material for processing powder metallurgy tungsten products and tungsten alloys. Pure tungsten powder can be made into silk, rod, tube, plate and other processing materials and certain shape products. Tungsten powder mixed with other metal powders can be made into various tungsten alloys, such as tungsten molybdenum alloys, tungsten rhenium alloys, tungsten-copper alloys and high-density tungsten alloys. Another important application of tungsten powder is to make tungsten carbide powder, which can be used to prepare cemented carbide tools such as tool, milling cutter, bit and mould.
Tungsten products
Particle size classification of WC powder
Tungsten powder quality directly determines the quality of tungsten carbide (WC) and alloy properties, tungsten powder grading can effectively change the performance of the powder, solve the problem of coarse clip to fine powder, reduce the minimum size and maximum diameter and average particle size difference degree, to produce more crude and more uniform tungsten carbide powder; Due to the characteristics of tungsten, it is not easy to be broken. In the pre-grading, the particles should be broken in a proper way, and the granules of the powder can be separated, and the powder can be separated more effectively and the uniformity can be improved. According to the characteristics of the original powder, it is necessary to find the best operation process.

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December 08, 2017

Guided T-A deep-hole drill to replace solid carbide burs

Drilling deep hole is not only the "unique skill" of gun drill and integral solid carbide burs. As early as 15 years ago, the united machinery and engineering corporation (AMEC) began making its Guided t-a bit (to perfect its t-a drilling system) and used it for gun drilling. The Guided T-A bit is A customized tool designed for customers' specific processing needs, which can process long diameters of 5, 10, 28 or larger. It consists of a high strength steel blade and precision grinding of cutter holder on the form, the knife can be clamped on the company's standard series of cemented carbide and high speed steel blade, the processing aperture range of 9.5-115 - mm (can be customized size). The drill can be used for milling machine or lathe.
In addition, the design of the Guided t-a bit enables it to overcome the difficulties which may result in the failure of the solid carbide burs. Miller added, "the solid carbide drill bit is not suitable for intermittent cutting, such as drilling cross-hole or exporting holes in the surface or inclined plane. Usually, in the case of these machining situations, the hard alloy bits have a large force on one side, so it is easy to cause the drill to deviate from the center line or fracture. The Guided T-A bit has A supporting area behind the flat drill at the front, and the supporting area always keeps in contact with the hole being processed and does not allow the bit to deflect. AMEC company advised, the user can use A first length is relatively short (1-2 times the diameter) of pilot drill processing guide hole, its aperture and Guided T - A bit diameter is the same, this helps to reduce the bit offset and oscillation process.
Three years ago, Smith International Inc., A supplier of U.S. oil and natural gas, tried using A Guided t-a bit to finish the process of drilling in high-speed steel. Processing tasks included in 4140 on the steel tube heat treatment (hardness HRC30-32) at 30 degrees oblique hole drilling depth is 355 mm. According to Ray Stafford, a processing manager at the company, it takes about five hours for each hole to be used by workers before they are drilled through a high-speed steel drill. "We first work out a guide hole with a fixed core drill, then use a high speed steel extension taper shank drill to get to the drill hole, and then use the drill to drill through the hole. Therefore, we hope to have a bit that can improve the processing speed."
The Smith company asked AMEC to make A Guided t-a drill with A diameter of 44.45mm and A length of 355mm. "We got a bit of the required specification," Stafford said. "it worked very well after it was put into use." The deep hole is processed from beginning to end using only one drill. The processing time of each hole is only 1 hour and 15 minutes. In addition, once used to drill the drill, every three holes must be resharpened. The Guided T-A drill can process 9 holes before it has to replace the high speed steel blades. Now, the company has found that it can also be used in more processing situations.

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December 07, 2017

Some discussions on the wire drawing process

The surface wire drawing process is usually the manual drawing and mechanical drawing.

As , hand-drawn wire is generally aimed at small workpieces, which have a certain shape of workpiece, and the grinding products used are usually industrial baijie. This kind of wire drawing method has low production efficiency, the line effect is unstable, so it is not mainstream in industrial production, the mainstream is mechanical drawing.

The advantages of mechanical drawing are fast, high degree of automation, and stable and controllable drawing effect. Mechanical drawing is mainly divided into flat - pressed abrasive belt drawing, wire - contact abrasive belt drawing, non-woven roller drawing.

First of all, we introduce the flat - pressed sand strip. The workpiece on the fixture, start the sand machine, abrasive belt high-speed rotation, and then, on the back of abrasive belt with a controlled, can be up and down, left and right sides of mobile press block, but briquetting press, abrasive belt can stick take in wire drawing workpiece surfaces. This kind of mechanical drawing method is a flat wire drawing, which can not have any convex point on the surface of the drawing. It is characterized by a continuous line pattern, long.

Wire contact sand drawing is a traditional drawing method. In different places, the surface of the contact surface of the sand belt is accomplished through the contact wheel instead of the specially designed pressure block. So the workpiece is in contact with the sand, point, line contact, not surface contact. So, even with the same sand belt, there is a distinct difference between line contact and surface contact method.

In addition to the two kinds of mechanical methods used in the use of abrasive belt, there are also non-woven roller wire drawing process. As I said, the non-woven material is also a good material for drawing. Non-woven material is elastic and has a special three-dimensional network structure, so it is commonly used as a wheel. Since the elastic ratio of non-woven material is better than sand belt, it has better surface fitting and is suitable for machining some curved parts. In addition, since the non-woven roller and workpiece are line contact, the surface contact of the peaceful pressure type abrasive belt drawing is less heat and is cold machining.

The above three types are commonly used in industrial production. In practical application, according to the different shape of the workpiece, the different line, and centerless grinding wiredrawing, static drawing several ways, such as but as a result of application is not wide, does not make the detailed discussion here.

To sum up, wire drawing process is a complicated and complicated process. It's difficult is not whether can pull wire lines, but in the case of the customer designated line effect, how to use the hands of the grinding materials, machinery and equipment, how to set the grinding parameters, etc., to pull out the high similarity of lines. Therefore, if you want to satisfy your customers, you should pay more attention to the new types of grinding products in the market, besides the type and performance of the machine.

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December 01, 2017

Introduction of the manufacturing process of carbide blades

A typical machining shop may consume thousands of cutting inserts per year. An operating worker may use many cutting inserts daily, but never think about the complex scientific knowledge behind the inserts. c, for the proper use of tools and performance optimization will be of great benefit.


Composition of Carbide blades

As with all man-made products, manufacturing cutting inserts first addresses the raw material problem of determining the composition and formulation of the insert material. Most of today's blades are made of cemented carbide, whose main components are tungsten carbide (WC) and cobalt (Co). WC is a hard particle in the blade, while Co acts as a bond to shape the insert.


Carbide cutting blades performance applications:

Carbide cutting blades, carbide blades, which is a powerful modern manufacturing equipment processing equipment, carbide cutting blades, carbide cutting tools with its excellent performance as a super-hard cutting tool in the most competitive products, as a Carbide cutting tool, it is a wealth weapon, widely used in manufacturing now. China xiamen Tungsten Technology Co., Ltd., tungsten carbide professional manufacturer, to provide all kinds of carbide cutting blades, carbide shaped custom-made tools customized service.


Carbide cutting blade Product features:

Our company has a complete industrial chain of cemented carbide, carbide production technology for many years based on, combined with rich experience and production and processing equipment to market-oriented customer demand-oriented, in order to achieve and meet the customer value for the goal, there is a Customers need to provide custom carbide cutting blades customized services to customer drawings or sample data as a reference to the specific requirements for the purpose and dedication to meet the customer's use of carbide cutting blades. My company in accordance with customer requirements produced by carbide cutting blades to ultra-fine particles of high-quality tungsten carbide raw materials for the substrate, after high-precision processing equipment refined, with good toughness and service life.


development trends

According to the needs of the development of the manufacturing industry, multi-function compound knives, high-speed and efficient knives will become the mainstream tool development. In the face of the increasing number of difficult-to-machine materials, the tooling industry must improve the tooling materials, develop new tooling materials and more rational tooling structures.




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November 24, 2017

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

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

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

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

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

Summary CoroDrill 860 solid carbide drills

The technical features of the head are as follows:

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

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

The high toughness new tungsten carbideextends the cutter life;

The blade handle can control wear and provide higher reliability;

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

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

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November 23, 2017

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

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


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


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

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