October 20, 2017
carbide milling cutter is made of materials refers to the use of cemented carbide carbide cutter. Understand the need to know what istungsten carbide, hard alloy with high hardness of refractory metal carbides (WC, TiC) micron powder as the main ingredient, with cobalt or nickel (Co) (Ni), molybdenum (Mo) as the binder, powder metallurgy products in vacuum furnace or hydrogen reduction furnace in sintering.
In the three edge milling cutter, milling or some surface milling, cutting force in different directions. Surface milling, milling cutter in the workpiece just outside the cutting force in the direction of more special attention should be paid. When the milling, the cutting force will work pressure to the work table, cutting force inverse milling workpiece and left the table.
As the cutting effect of progressive milling is the best, milling is usually preferred. Only when there is a screw gap in the machine tool or a problem that can not be solved by forward milling, reverse milling is taken into account
In an ideal situation, the diameter of the cutter should be higher than the width of the workpiece, cutter axis and workpiece center line should always leave some distance. When the tool is placed on the center of cutting, easy to produce burr. Continuous cutting edges entering and withdrawing from cutting when the radial cutting force direction will change, and it may damage the spindle vibration the blade may be broken, the surface will be very rough, with slightly off center, cutting force direction will not change anymore -- cutter will get a pre load. We can put the center of milling to drive on the road.
Every time into the carbide cutting cutter, cutting edges are subjected to impact load, transverse load depends on the size of the chip, workpiece material and cutting type. Cutting, between the cutting edge and the workpiece is correctly occlusion is an important direction.
When the cutter axis is completely on the lateral width of the workpiece, the impact force at the cut in is borne by the outer blade tip, this will mean that the impact load from the initial part of the most sensitive tool to bear. The last and carbide cutter to the tip off the workpiece, that is to say from the beginning to leave the cutting blade, cutting force effect has been on the outside of the tip, until the impact unloading so far. When the center line of the cutter is located in the edge line, when the chip thickness reaches the maximum when the blade from the cutting load, reaches the maximum at the cutting impact. When carbidemilling cuttersaxis line is located within the width of the workpiece, the initial impact load when starting position the distance along the cutting edge by far the most sensitive point in the back and bear, knife blade smooth exit cutting.
For each blade, when to exit when cutting off the workpiece cutting edge way is important. The remaining close when retracting materials may be much reduced. When the blade gap chip from the workpiece along the blade rake surface will produce an instantaneous tensile force and burrs on the workpiece. This often produces the tensile force in dangerous situations endangering the cutting edge.
October 10, 2017
In the new world economic integration wave, the acceleration of global manufacturing to the mainland of China has been a trend, and China will gradually develop into a world-class manufacturing base. The obvious advantage of guangdong, especially the pearl river delta region, we will develop into a global mold production center within ten years. The cutting tool market is in a period of rapid development, and simple tools are being replaced by more and more multifunctional tools. In the production of the future, the user will be on the research and development of cutting tools is put forward higher request,itis not only in the field of cutting tool materials and surface coating technology, but also for cutting tool production technology will have more strict requirements.
Carbide can also be used to make the drilling tools and mining tools, drilling tools, measuring gage, wear-resistant parts, metal abrasive, cylinder liner, precision bearings, nozzle, hardware mold (such as wire drawing die, bolt moulds, nut moulds, as well as a variety of fasteners, mold, excellent performance of cemented carbide gradually replaced the previous steel mold).
The worldwide demand for carbide cutting tools is growing. Among them,the growth of European and north American countries is stable, especially in eastern European countries. Asian markets have recovered slightly and the market potential is large, and the market of Latin American countries has grown significantly, especially in Mexico. Cutting tool market demand growth slowly, mainly because of cemented carbide tool life increased, then there is the user request, for the whole manufacturing process instead of many machine tools and cutting tools. As well as the use of multi-function knives, a lot of simple cutting tools have been replaced.
According to statistics, the production of tungsten carbidecutter in China is increasing year by year, making carbidecutting tool material enter the development era represented by tungsten carbide. According to the current situation of China market, the market share of domestic carbide turning tool is lower than that of imported tools, so it is urgent to adjust the industry structure.
Our country has entered the stage of manufacturing industry to upgrade, the state planning to high-end equipment manufacturing and information industry into the pillar industry of national economy, which will greatly promote the carbide blade, cutting tool market demand, the cemented carbide industry promising prospects.
September 29, 2017
The design of the carbide nozzle is sintered according to the heat pressure of the hole and the hot straight hole. In the process of machining, precision grinding and surface treatment must be done to achieve the roughness of the hole roughness of Ra0.1 and r0.025. There is a scientific design of radius of curvature at two entrances.
Generally speaking,the shape of the design hole of the carbide nozzle is determined by the airflow pattern. Hard alloy nozzles generally have straight holes and perforations.
With the development of the oil industry and the increasing demand for energy, the technology related to oil drilling has been continuously promoted. Early oil drilling mainly USES human impact drill, mechanical cable drilling, rotary drill and so on, in the selected surface position of a certain diameter of the cylinder hole to the underground oil and gas layer. This type of high pressure air drill, drill hole drill and cone drill can be used with carbide ball tooth to improve the drilling efficiency and prolong the life of the drill bit. At present, the researchers have found a more effective high pressure abrasive jet technology for deep and marginal oil reservoirs. High pressure abrasive jet in high pressure water jet as the carrier, add a certain amount of abrasive particles, the impact of jet is greatly ascend,whichalso make the rock cutting efficiency is greatly improved, has a wider application prospect.
In the high pressure abrasive jet, a hard alloy nozzle is played. It has high hardness, high strength and excellent abrasion resistance. Usually in the process of drilling, usually in a high confining pressure conditions, thus the nozzle in the working process of the need to bear the high speed impact of high pressure abrasive, thus more prone to wear and failure. Ordinary materials, such as steel nozzles, are prone to heat deformation or disintegration, which require frequent replacement of nozzles, thus reducing the efficiency of drilling. In particular, it is very inconvenient to remove the drill bit when deep drilling is carried out. In addition, the inlaying of hard alloy materials in the most vulnerable parts of the nozzle is also a method to improve the performance of the nozzle and prolong its service life. The tungsten carbide nozzles can further improve the hardness of the nozzle and the abrasion resistance by reducing the size of WC grain size.
That is an introduction to the design of tungsten carbide nozzle, you can choose according to their industry and environmental characteristics required for hard alloy nozzle in combination with its working principle and design factors to select and efficient industrial applications.
September 26, 2017
Nowadays on the market is generally a bit alloy steel material whole carbide drills, although the materials are the same, but due to the processing technology, various brands of product quality disparity. Imported and domestic tungsten carbide drills are also very different.
In the mechanical processing industry, enterprises in the production management in order to improve production efficiency, reduce production costs, to ensure machining quality and stability and adequate tool life conditions, which can be achieved by improving the service life of carbide drill bits of hard alloy or improve production efficiency.
In the process of machining, drilling holes or drilling holes are often encountered on the surface or incline, and several cutters are used, which not only affect the cost of production, but also reduce the production efficiency. To this end, cobalt collar developed RT100P high-performance alloy bit, in order to better meet customers’needs.
As an important member of A-Brand products in the series, OSG ADF cemented carbide drill head has multiple functions, stable and high quality of hole machining. Usually, when milling flat bottomed holes, both milling cutters and drills are required. ADF can do one step processing, which can shorten the processing time and simplify the management of tools. And this carbide drills can balance the machining accuracy and reduce the displacement of the drilling hole. The utility model can be widely used in the processing of automobiles, moulds, and various mechanical components.
The cutting edge design ADF uses a sharp cutting angle design, so that in the case of low cutting force can minimize the reduction of material on the formation of burrs; have large chip removal groove, so as to achieve a smooth chip removal.
Patent coating ADF uses the latest patented coating EgiAs, OSG,even in the case of high temperature, this kind of carbide drill bitscan also achieve long life and low wear.
The design of cutting stability ADF can be applied to a wide range of machining conditions, including machining surfaces, surfaces, holes, eccentric holes, thin materials, etc.
The design of processing range ADF can be applied to a wide range of machining conditions, including machining surfaces, surfaces, holes, eccentric holes, thin materials, etc.. Applicable to a variety of common processing materials, such as carbon steel, alloy steel, hardened steel and cast iron of up to 35HRC. Standard type diameter from 2mm to 20mm, lengthened type directly from 3mm to 20mm.
September 22, 2017
Blades are made of the world's hardest materials. Without blades, the world of metal cutting would be very different. The main components of cemented carbide inserts are tungsten carbide and cobalt with different proportions. The primary form of the material is powder. In containers weighing about 560kg, the ingredients are well matched and will be used to produce different powders. In the workshop, the dry material is mixed with a mixture of ethanol and water to form a thick, acid like gray paste. When the slurry is dried, the sample is sent to the laboratory for quality testing. These powders consist of many particles of 20-200 m in diameter, very tiny (a hair diameter is 50-60 m).
The powders are packed in a volumetric 100kg barrel and delivered to a stamping machine for making carbide inserts. The operator puts tungsten carbide dies (it is used for stamping different blades) into the machine tool and enters the order number into the computer, filling the mold cavity with the powder according to the order information. The pressure of each blade is as high as 12 tons. The machine tool will weigh each blade and the operator will observe and control it. At this stage, the blade is very fragile and easily ruptured.
The stamped blade needs to be heated to harden it. The job is done by a sintering furnace, which can handle thousands of blades at one time. The pressed blade powder is heated to about 1500 DEG C in the course of up to 13h and is melted into hard alloy. The shrinkage ratio in sintering process is about 50%, so the specification of carbide blade is only half of that before sintering.
Once again, in the laboratory, the top and bottom of the blade will be grinded to the required thickness. Because cemented carbide is very hard, it is necessary to grind it with industrial diamond.
When carbide blade reaches the required thickness, further grinding is carried out to obtain accurate geometry and size. The Kimmer factory staff by using 6 axis grinding plate to meet the stringent tolerance requirements.
After grinding, the carbide blades will be cleaned and coated. To avoid any grease or dust, gloves must be worn when handling the blade at this stage. The blade is placed on the fixture of the turntable and then fed to a lower pressure coating furnace. After coating, the blade shows different colors.
At this point, the blade has been produced, the staff will use the microscope for each batch of products sampling, to ensure that the quality meets the requirements. Before packing, the staff will check again one by one blade, and check the drawings and batch number, and then use the laser marker in carbide blades on the right material, the grey box blade into the label, you can put the blade delivery to the customer.
September 19, 2017
cemented carbide cutter as a high-performance super hard tool, with the development of Chinese some of the domestic high-end manufacturing industry, has been used more and more widely, can be said that high-end manufacturing greatly promotes the development of cemented carbide tool.
Cemented carbide tools have now been coated with titanium carbide, titanium nitride, alumina hard layer or composite hard layer by chemical vapor deposition. The developed physical vapor deposition method can be used not only for carbide cutting tools, but also for high speed steel cutting tools such as drills, hobs, taps and milling cutters. As the barrier of chemical diffusion and heat conduction, the hard coating will slow down the wear rate of the tool when cutting, and the service life of the coated blade will be increased by more than 1~3 times compared with that without coating.
Due to the high temperature and high pressure, high speed, and working in corrosive fluids in parts, the application of hard cutting materials more and more, the automation level of machining and the machining accuracy of the increasingly high demand. In order to adapt to this situation, the development direction of the tool is the development and application of new tool materials; coating technology for the further development of the tool of vapor deposition coating, the higher hardness in the matrix with high toughness and high strength, better solve the tool material hardness and strength between the contradictions; the further development of the structure of indexable tool to improve the manufacturing precision of the tool; the quality of the products, reduce the difference, and the tool used to achieve the best.
First of all, as the mother of the manufacturing industry, the machine tool industry, especially the leap growth of CNC machine tools, will help to expand the market of machine tool carbide cutting tools. We know that a machine with more than a dozen or more kinds of tools, and knives are consumables, need to be replaced regularly, in order to ensure efficient production efficiency.
Secondly, the demand for carbide cutting tools, such as shield machines, is increasing rapidly in railway and urban rail construction. The cutter belongs to the consumable in the shield machine. The shield machine must replace one hob drill bit on average every 200 meters -300 meters.
Thirdly, the PCB sub industry will be maintained at an average annual growth rate of 9.3% over the next years and is expected to increase by nearly 4 billion yuan in the next 5 years.
Finally, the amount of drilling exploration and mining in the 60%-80% address through the completion of the cemented carbide cutters, with lower grade mines and increasing of mining depth, the average annual growth rate of 5 annual consumption is expected to maintain 30% mining carbide tools in future.
September 15, 2017
In recent years, the domestic production of cemented carbidebars has been increasing, but as demand continues to expand, the market is in short supply, and its quality inspection requirements are also facing difficulties. At present, the detection of cemented carbidebars in China generally adopts manual methods, which consumes more manpower and unstable test results. The automatic inspection equipment is gradually favored by the majority of manufacturers.
According to relevant data, cemented carbidebar has a series of excellent properties such as high hardness, high wear resistance, high strength, bending resistance and long service life of carbide tool. cemented carbidebar is a kind of blank for making drill bits and tools. At present, powder extrusion forming technology is adopted. Now widely used in the production of automobile, tool bit, printed circuit board, the whole engine tool tool, milling cutter, reamer overall, carving knife and so on, but also can produce punch, mandrel, top and perforating tool. With the rapid increase of market demand, ultra-fine grained carbide bars have been used more and more widely. In the field of high speed cutting, due to the high safety requirements of the safety, reliability and durability of the tool, the quality requirements of the internal and surface of the whole cemented carbide tool are more stringent. With the continuous improvement of the internal quality of cemented carbide bars, especially superfine cemented carbides, the quality of cemented carbide tools has been paid more and more attention to.
Itis a kind of product with high requirement of cemented carbide bars material. Oxygen content is considered as a harmful substance in cemented carbide mixture. Whether the water in the atmosphere or reconcile drying is the mixture of oxidation to the extreme, in violation of the normal quality control principle, what is the purpose? The reason is: the production of cemented carbide in the production process control, the biggest difficulty is the balance of carbon and oxygen, the experimental analysis shows that the material on the degree of oxidation and to 3 days 7 days, 15 days to 30 days the oxidation degree is different, but 30 days later after the oxidation of saturated very long almost no change. Therefore, if the degree of oxidation is increased directly to saturation, the method of increasing carbon content should be adopted, and the process control of carbon and oxygen balance will be easy. This process is the control of such cheap operation. This is the biggest feature and advantage of this process.
The structure of the products of the chemical production process is normal, the physical properties of the low quality, the key technology is not a problem in itself but the process needed to do not have the conditions at home and abroad: technology developed, due to environmental constraints, the use of water as a carrier, if the use of water as the carrier, must improve the original carbon the content of the compound WC. While the domestic WC in carbonization when the composite carbon to a certain extent, it will be difficult to improve, for example, when your WC total carbon is 6.2%, may be free carbon is 0.5%, composite original carbon only 6.15%. Carbonation has not yet been achieved, so at present, the carbide alloy bar adopts this process is to use C black in ball milling to improve the total carbon content, free carbon is unable to restore, part of WC is oxidized.
Find more information out online at www.wococarbide.com
September 13, 2017
Productivity and cost are the biggest trends in drilling today. This means that drilling tools and bits of tungsten carbide bits need to be able to combine some operational mechanisms to develop tools to meet more and faster demand.
Should be based on carbide bitsdiameter, rock properties and production indexes of the drilling strata of the highest penetration (rate of penetration, back to the time, drilling footage) and economic indicators (drilling cost, use) choose the number of cutting tools, the blade on the drill bit size, welding Angle and blade Angle. The inside and outside of carbidedrills, the blade should be symmetrical and flat, and the welding should be firm, not qualified and not allowed to use. The old drills can be reused after being repaired. A needle carbide bit must not be shorter than 95mm. In the case of the diamond drill bit, the inner and outer edge should be consistent with the corresponding diamond bit.
The outer diameter of the hard alloy bit is not too large.
After carbidedrill is drilled into the hole, it should slow down and press the hole to the bottom of the hole, and gradually add enough pressure. When drilling into hard rock, it is strictly forbidden to speed up simply when the pressure is insufficient.
Reasonable control of the length of the return drill. According to the wear condition of the drill, improve the drilling technical parameters of the next time.
The remaining core of the hole must be handled with the old bit and must not be entered into the new bit.
If the drill is in the middle of the road, it may not be difficult to block, but it can be used to wiggle the drill pipe or drive car. The drill bit of a needle carbide drill can be stopped and the normal bit is changed when the above measures are taken.
When unscrewing the bit, hard alloy, alloy tire block or a flat bit are hard alloy. It is strictly forbidden to hammer a bit with a hammer.
Hard alloy bit is easy to change, the customer USES a bit to replace multiple tungsten drill bitscan drill several different size holes. In addition, it also reduces the cost of regrinding welding or solid carbide bits. End users only need to buy the hard alloy drill tip, which is about the same as the cost of regrinding welding or solid carbide.
Hard alloy drilling selection procedure
The diameter, depth and quality of the hole are determined
Production economy and cutting reliability should also be considered.
The diameter, depth and quality of the hole of the carbide drillsare selected
Select the type of bit
Step 2: select a bit for rough machining and/or machining holes. Check that the drill bit is suitable for the material of the workpiece, the quality of the hole and whether it can provide the best economy.
Hard alloy drill selection step - select bit type
Select the number and groove of carbidedrill bits
If the indexable blade bit is selected, the blade must be selected separately. Find the blade suitable for hole diameter and select the groove shape and number of the workpiece material. Select the appropriate number for the whole or welding carbide drill bit.
Hard alloy drill selection procedure - select the drill number and groove shape
Select the type of handle
Many drills have different installation methods. Find the type of machine tool.
September 05, 2017
Existingmanufacturingfor carbide cutter, generally comprises a cutter rod and a cutter head, the cutter bar and the tool head is two parts separately machining, tool head is made of cemented carbideprocessing, turning head mounted to the knife rod, the blade part turning head are generally wider than the width of the knife rod part of the car or on the coarse fine car to facilitate. However, the tool head and the cutter rod installation will always produce precision finishing installation error, and blade turning head due to the difficulty of processing and single shape, it is difficult to achieve the processing of complex shape parts.
How to solve the problem that the precision of carbide turning tools is not high enough
Carbide cutting tool comprises a cutter rod and connected with the cutter head and the cutter rod end, wherein the knife rod and the cutter head are integrally formed,the cross section of the cutter rod part is square, an angle of the cutter head to the cutter bar section tilt, tilt to the the tip is formed at the edge of the knife head,the side of the blade tip protrusion section for the knife rod, wherein the blade section is inclined to the point between the concave circular arc.
Triangular cemented carbideblade changed to small milling cutter
In the milling of narrow and shallow groove, if there is no suitable milling cutter,which can find a triangularcemented carbideblade, this made into small carbidecutter.
After finding the triangular cemented carbide blade, measure the thickness of it and use it as thin as possible when it is too thick. According to the center hole size of the blade,a milling cutter rod is made. The blade is mounted on the milling bar and then fastened with a small nut. Because of the hard alloy blade triangular car center hole without keyway,not with the key force, while the small nut fastening force is too small, so we should use the car blade welding brazing method to cutter rod. The workpiece is clamped on the fixture and can be milled after a good knife. Because this kind of milling cutter is negative front angle.Milling depth,feed rate and milling speed can not be large, and add coolant cooling.
End milling cutter capable of compressing workpiece in center
The workpiece is a square, with a round hole in the middle, the positioning plate according to the size of the workpiece processed with square shallow nest, just put into the workpiece, in the shallow pit or four edges milling out a small mouth, available tools to pull the milling workpiece.
In order to ensure the workpiece in the milling process can not fly out,especially the design of the end milling cutter in the center of the workpiece, the lower end is connected to end mill body screw sleeve ball head pin between the ball head pin and the knife body and a compression spring to put pressure on the ball head pin, so that the ball head pin to fit in too the workpiece.
The carbidecutter can also be mounted on a radial drilling machine for use in milling smaller workpieces. The locating plate can be made of low melting point alloy and tightly pressed on the table of the milling machine or the radial drilling machine.
September 01, 2017
August 23, 2017
In machining,hole processing accounts for about 1/5 of the total processing amount, and the holes in the hole account for about 30% of the whole hole processing.Compared with the traditional HSS twist drill, the current carbide bit is more and more users with such characteristics as high speed, long life and high precision.There are four main kinds of cemented carbide bits: solid carbide bits,indexable carbide indexable insert bit,welded carbide drill bits and replaceable cutter head carbide bits.Each kind of carbide drill has its advantages in special occasions.
Different types of carbide bit features
Integral cemented carbide drill bits (It can be processed with deep hole and high machining accuracy;Re-ground and reuse, effectively reduce the processing cost.
Carbide indexable insert bits (Discard blade, low cost, easy to change knives;Usually 2D - 6D specification with no centring function;the blade is rich ,The machining accuracy is relatively low.
Replaceable carbide drill bit type (centering function, complete kinds,same tool holder can be installed a variety of the diameter of the cutter c. high machining efficiency, high machining accuracy ,Many kinds of material of rotary cutter for different material,resharpening can further reduce the cost of the cutting tools)
Analysis of the advantages and disadvantages of these carbide bits
Drilling in high speed, high precision, many users choose the hard bit or replaceable carbide bits type, both the bit with the function of self-centering, and high efficiency, high precision drilling, drilling can generally IT6 - IT9 grades.In comparison with the two rigid ratios, the rigidity of the hard bit is better.
However, due to the high cost of considering the whole drill bits,in order to be able to re-grind many times,it is necessary to use a longer solid drill bit,which will weaken the rigidity.And replaceable tungsten carbide drill bitstype can choose the most suitable length of drill pipe,the greatest degree of assurance the rigidity, combined with the convenience of operation, the unit price of the cutting tools is harder than the drill unit price much lower, because of these factors, so more and more users like to use this kind of replaceable tungsten carbide drill bits type.
Because cemented carbide is very precious,use carbide bits correctly,accomplish the use of the material, it is every mechanical worker responsibility.How to use carbide bit correctly,mainly includes the following aspects:
1.Choose the right machine tool
Carbide drill bits can be used in nc machine tools,machining centers and other powerful and steel machine tools,and should ensure that the tip of the blade is beating TIR < 0.02.And the radial drilling, universal milling and other machine tools due to the low power,the spindle precision difference, easy to cause the carbide bit of the early collapse, which should be avoided.
2.Select the correct handle
The spring clamping, the side pressure handle, the hydraulic handle,the heat up the handle and so on can be used, but because the quick change drill clamping grip is not easy enough to cause the drill bit to slip and the failure, should put an end to use.
(1) the cooling should be taken care of in the direction of the cooling,forming the upper and lower terraced configurations, and minimizing the Angle with the cutter as much as possible.
(2) the cold bit should pay attention to the pressure and flow, and prevent the leakage of coolant to affect the cooling effect.
August 18, 2017
In 1953,the American welding society of thermal spraying zinc and thermal spray aluminum in the industrial environment,water environment (not half submerged in flowing seawater and fully immersed in water to flow, and oceanic environment three categories of industrial test of 19 years, on the 4248 pieces of specimens, the test results show that the spray zinc,aluminum and closed coating can all of the above three types of environment of steel structures to provide long-term effective anti-corrosion protection,unveiled the world's most famous hot spraying 19 years AWSC2 14-74 test report.
American LAQUE 34 years anti-corrosion coating technology center in Marine atmosphere corrosion performance test report confirmed that the thermal spraying zinc and aluminum coating on a variety of harmful environmental medium and long-term effective, the United States on the basis of this combined with 19 years report, formulated the AWSC2 18-93 thermal spraying operation guide, as the thermal spraying construction enterprise quality control manual, in order to direct production.
The us navy's civil engineering laboratory has been tested for 10 years of Marine climate and sea water for 75 mu m thick spray zinc and aluminum coating,and no red rust has been found to prove that the coating is effective.
The French underground railway company has been exposed to zinc and aluminum for 10 years, and the results show that anti-corrosion is effective.
The former Soviet tbilisi underground mine water test pointed out that the spraying of zinc is at least 30 years of corrosion resistance.
The results are consistent across countries. Heat spraying zinc and aluminum coating can provide long-term and effective protection of steel in the Marine atmosphere, industrial atmosphere and seawater environment. These test results directly as standards based on the thermal spraying anti-corrosion technology,directly promoted the large steel Bridges since the 1960 s the world developed countries the application of thermal spraying anti-corrosion,for the world to make a huge contribution to the development of thermal spraying.
The application of thermal spraying in the bridge, has started in the 1930 s, the development to 60 ~ 70 s, Europe every year used in thermal spraying zinc wire up to 40 million pounds, the United States each year the thermal spraying zinc wire up to 2 million pounds;The corrosion resistance of general thermal spraying composite coating is 20 ~ 40 years.
Many Bridges in Britain have more than 25 years of zinc spray.Responsible for bridge maintenance engineers, according to their experience of large-scale structure spraying zinc that bridge in the bad environment, hard to get to the bridge or not likely to be close to, spraying zinc, aluminum is a kind of effective treatment methods. The UK has cited examples of the use of thermal spraying in large steel and steel Bridges across the country,all of which have been effective for more than 25 years without maintenance.
Koons ferri madden, reed fourth highway bridge,It is the world's largest steel bridge in the 70 s, 20000 t steel, spraying zinc wire 1 million pounds, anti-corrosion effect is very good, with over 20 years without maintenance.
South wales Newport (New port) George street Bridge (George Steet Bridge), founded in 1964, is located in the highly industrial pollution environment,using spray zinc corrosion,by 1985,namely after 21 years with no maintenance, check the coating in good condition,and confirmed that at least 5 years without maintenance.
Scotland's luxury linse feely (Qucesferry) fourth road bridge, built in 1960 ~ 1964, the bridge mainspan 1000 m, is located in the windy Marine environment, with spray zinc and closed processing, after 13 years without maintenance, found that coating color is still in good condition, structure and perfect.
August 08, 2017
Generally speaking,the carbide saw blade consists of two parts: saw board and cemented carbide saw blade. Hard alloy saw blade is basically exported at the moment. Fine alloy particles used in the blade thicker, larger, because that kind of alloy saw blade by grinding, frequently use full long, cemented carbide riveting quality also is very main,weld thin and well-balanced,as on the saw blade can accept bigger cutting force. The quality of saw blade is often the main one. As the saw blade is in the air, it will not only transmit the cutting force but also maintain the stability of the task. The quality saw blade not only has the dynamic amount of time and time and the accuracy, but also the static characteristics of it.
With corundum saw blades,on the other hand,when the saw blade cutting in succession, alloy saw blade cutting of heat will spread to sawing plate, reduce a measure of the sawing plate, excellent sawing plate under such conditions can also maintain the precision of the position, and poor quality of the saw blade sawing plate buckling will attack, reaction to the cutting precision.
Carbide saw blade as carbide cutting tools products is designed for cutting and grooving of metal material,It is the most commonly used cutting wood products processing, the quality of the carbide saw blade has close relationship with the quality of processed products.It is of great significance to use hard alloy saw blade correctly to improve product quality, shorten processing cycle and reduce processing cost.
If poor quality metal saw blades are selected, the following methods may be needed to repair them. So when is the carbide saw blade needed to grind?
In case of any of the following conditions, the carbide saw blade shall be repaired in time:
1) cutting quality no longer meets the requirements;
2) when the energy consumption of sawing machine is obviously increased;
3) the edges of the cutting materials have obvious detonation;
4) carbide saw blade wear reaches 0.2 mm grinding in time is very important, because the passivation of the saw blade edge at work,because the resistance increase, easy to cause a shaking of the saw blade,increasing the motor load,the saw blade and machine will cause damage.To continue cutting at passivation, each additional 10% of the cut will result in an additional 50% of the alloy damage. Shorten the service life of the saw blade.
Grinding of carbide saw blade:
1) it adopts precision, stable and non-vibrating sharpening machine, as well as suitable diamond grinding wheel, which can be repaired and used in accordance with the prescribed operating procedures to improve the service life of the saw blade. If the manual edge grinding equipment is used, the precise limit device and the end jump of the test tooth top are required.
2) remove the resin, debris and other debris from the saw blade before the grinding.
3) the cutting edge of the blade should be strictly followed by the original geometric design of the blade, and it is suggested that the cutting edge and back Angle of the blade should be used at the same time to increase the number of grinding times. Maximum service life.
For more information, please visit our website at wococarbide.com
August 01, 2017
Cemented carbide as industrial teeth,which is mainly using plasticity and toughness to high hardness,high wear resistance metal compound performance and good high-temperature resistance and good bonding phase,to achieve the effect of cutting,drilling and abrasion resistance.These properties make it difficult for some of the properties of cemented carbides, such as hardness and strength, toughness and wear resistance,mainly because it is difficult to simultaneously increase the content of hard and bonded phases.Science and technology are the primary productive forces,and cemented carbidewith new structure can improve its hardness and toughness to a certain extent.The new structure mainly has gradient structure, nano and ultrafine crystal structure,ultra coarse crystal structure and other special grain distribution structure.
The cemented carbide with gradient structure refers to the gradient distribution of its hard and adhesive phases on a certain spatial scale,so that the regulation of its properties has the greatest degree of freedom.according to the performance requirements, there are many kinds of functionally graded cemented carbide.In 1980s,the development of functionally graded structures Sandvik rock drilling tools company's dual phase DP hard alloy generally show a structure similar to that of sandwich,the alloy in the outer layer and the middle layer of WC+Co phase organization,the inner WC+Co+ of three-phase microstructure. The content of Co in the outermost layer of the material is lower than the nominal cobalt content of the alloy, and has high hardness and wear resistance.The content of Co phase in the interlayer is higher than the nominal cobalt content of the alloy,and has good toughness and plasticity. The wear resistance and toughness of DP alloy are obviously better than that of standard cemented carbide.The technology is known as "the most important innovation in cemented carbide since 1950.".20 world 90s,this technology is applied to metal cutting bit, which greatly improves the life and cutting efficiency of the product.Another class of very important gradient structures cemented carbide is used for coated blade substrates.
The microstructure of cemented carbide inserts usually consists of WC,Co and beta phases. Beta phase is a brittle phase containing titanium,which can improve the hardness of the material,but reduce the toughness.There is a certain physical,chemical and mechanical incompatibility between the coating matrix and the coating.By controlling the sintering and heat treatment atmosphere, can form about 50um on the surface of cemented carbide free beta phase layer,with good toughness,and coating with high bonding strength,improve the toughness and anti collapse cutting life of blade coating greatly.The process is simple,and most cemented carbide coated blade substrates adopt this gradient structure.The research on functionally graded cemented carbide in China has been reported in 1990s,but it is still lack of systematic and deep elaboration.Because of the specialization of cemented carbide and functionally graded materials, more practical research is needed.
July 27, 2017
How to optimize the drilling cycle without affecting the processing safety? Which processing strategy will shorten the cutting cycle by a second or two? These are the major challenges facing the auto industry.
How to deal with these challenges and the characteristics of drilling and threading processes in the automotive industry. Generally speaking, the materials used in the automobile industry are regular, mainly cast iron,carbide cutting tools,cast steel and forging.But the structure of the workpiece is extremely complicated, and the production efficiency, tolerances and surface quality of the workpiece are also very challenging.
If from these challenges,a series of turnkey tools are provided for the typical thread of the specific hole type and engine cylinder block, cylinder head, shell and crankshaft.
Dealing with complex car applications
460 - XM CoroDrill twist drill with 140 degrees point Angle, good centering function and smaller thrust, CoroDrill 460 - XM can provide excellent performance in many applications. The stability of tool life is beneficial to ensure reasonable inventory. Fine cemented carbide materials ensure a balance of hardness and toughness, good wear resistance and good service life. Two steps can be accomplished through a process that greatly benefits complex automotive applications.
Applicable to a wide range of applications
Diameter: 3-25mm (0.118-1.016-inch)
Drilling depth capacity: 8 times diameter
Internal cooling fluid and external coolant
Standard classification and carbide cutting tools
It is suitable for the large diameter drop hole which is required by the automobile industry
CoroDrill 400 straight flute drill with 120 degrees point Angle is optimized and is suitable for the complicated steps borehole diameter. Due to the support of the complex transitional form between the step holes, the drill can provide maximum performance when drilling the cylinder block and cylinder cover. Compared with the conventional spiral flute, the CoroDrill 400 is well suited to the machining of the step hole which is common in the automobile industry.
The CoroDrill 865 crankshaft oil hole drilling can provide an efficient solution for automobile iron parts and steel parts (especially crankshaft). CoroDrill 865 a series of characteristics, such as reduced apex Angle (more accurate centering), optimization of the Angle and first Angle characteristics (feed can be higher, chip removal more smoothly), increases the blade belt width (stability), update the spiral groove type (chip forming,carbide cutting tools strength higher) more effectively,make the production efficiency and tool life are improved.Adopting effective processing strategies and matching with controlled coolant or MQL is the key to ensuring success.
July 12, 2017
How do you find the proper carbide drill? Number of drilling machine parts for quenching far a matter, but often encountered in the work, such as: stamping die interrupt the socket head cap screw, or car rear plate spring and so on, it's about 45 HRC hardness, generally have difficulty in drilling bit out, and present the right carbide drill to buy less than, here introduces a simple method of self-made tungsten drill bits.
If less than 2 mm of carbide blade can be found,such as lathe operator with thin cut blade, if differences comfortable again,available general carbide insert the right to use the blade to cut thread cutting machine,and then press the appended drawings style of welding on the corresponding round bar, pipe's such as drill hole a little bit small,at least as large as the aperture. It can be used after manual roughing.If the diameter of the borehole is accurate, it can be used for grinding (tool grinding machine) and then grinding out the cutting geometry and chip groove by hand. And the drilling top Angle is slightly smaller than the normal bit, should be fixed with a small horizontal blade, make the hole easily hollow, prevent wobble. This type of drill can only be used for drilling hardened parts with deep holes. Socket head cap screw is broken in the hole, for example, bit diameter can be ground into a bit smaller than the bolt diameter is ok, such as drill M10 of screw, grinding to diameter Ø 7.8 ~ Ø 8. The maximum speed can be used when drilling holes. Just can't long time drilling,to keep back drill chip removal: drill pipe cooling appropriately, prevent oxygen welding the blade loss due to high temperature, the other main point can be reference to "hardened steel drilling are described.
In addition,tungsten drill bits is zero and negative front Angle, which is precisely the front Angle feature of hard alloy blade when cutting high strength materials and rough machining.
At present due to the evolution of cemented carbide manufacturing technology,fine grain of material to make the toughness of tungsten drill bitsis improved greatly, advanced coating technology makes the bit cutting performance is greatly improved, and the innovation of the cutting tool structure made up for the inadequacy of cemented carbide manufacturability is poor,which can produce large size and complex blade bit.
So in recent years, some famous foreign tool company, such as Walter, Kennametal, Sandvik, Seco has successively introduced all kinds of solid carbide drill bits, such as solid carbide drill bits, drilling of deep hole length to diameter ratio is as high as 70, it USES the XD technology, can be drilled in the process of deep hole without return, cooling through the cooling hole inside, and do not require any special cooling device), indexable insert carbide drill bit and removable nipple type products, such as covered with small diameter, large diameter and large length to diameter ratio, and other fields, due to its high efficiency, long life and high quality and a bit more than half a markets, especially in the production of some modern high degree online, traditional HSS twist drill has faded from people field of vision, gradually replaced by high productivity of cemented carbide drill.Therefore,tungsten drill bits are the trend of the future bit development.
July 03, 2017
For more details just visit our website at http://www.wococarbide.com/
June 28, 2017
The hard turning has been carried out by using carbide cutting tools. After more than ten years' development and popularization, this technology has gained great economic and social benefits. In the following, taking roll processing and other industries as an example, the application of superhard cutting tools in production is illustrated. Many large enterprises have used roll superhard tool of chilled cast iron and hardened steel roll and other types of vehicles, shortage of machining and fine turning, achieved good benefits:the average processing efficiency is improved from 2 to 6 times, saving processing time and power from 50% to 80%. Such as the Wuhan Iron and Steel Corporation HS60 to roll factory on the hardness of chilled cast iron roll rough turning, 80 semi refined car when the cutting speed is increased by 3 times, each car 1 rolls, saving power, labor costs more than 400 yuan,saving tool costs nearly one hundred yuan, achieved tremendous economic benefits. I like school with FD22 metal ceramic cutting tool HRC58 ~ 63 86CrMoV7 hardened steel roller (Vc=60m/min, f=0.2mm/r, ap=0.8mm), single blade continuous cutting roller path up to 15000m (tool flank wear width VBmax=0.2mm belt), to meet the requirements of the car instead of grinding.
At present, 70% - 80% of super - hard cutting tools have been used in domestic slurry pump factories. Slurry pump is widely used in mines, power and other industries. It is an urgent need at home and abroad, and its sheath and cover plate are HRC63 - 67 Cr15Mo3 high - hardness iron castings. In the past, it was difficult to make this material because of various cutting tools. Therefore, the process of annealing, softening,roughing, and then quenching must be adopted. After the use of ultra hard tools, a successful hardening has been achieved,eliminating annealing and quenching 2 processes, saving a lot of hours and power.
In automobile and tractor industry in the crankshaft, cam shaft, drive shaft processing, processing and maintenance tools, measuring equipment, processing problems often encountered hardened workpiece. If a vehicle factory in China, in the maintenance of the equipment required to process the bearing inner ring, the inner ring of the bearing (GCr15 steel) the hardness is HRC60, the inner diameter is f285mm, the grinding process, the grinding allowance is not uniform,2h can wear; and with super hard tools, only use 45min processing an inner ring.
After years of research and exploration,China has made great progress in carbide cutting tools, but the application of superhard cutting tools is still not widespread. The main reasons are as follows: production enterprises and operators do not know enough about the effect of using hard tools to make hard turning. It is generally believed that hard materials can only be grinded, and that the tool cost is too high. The first hard cutting tool cost than ordinary carbide cutting tools (such as high PCBN hard alloy is more than 10 times more expensive than ordinary), but its share in each part than the cost of grinding is low, and the benefits are much better than ordinary hard alloy;not enough research on the machining mechanism of superhard cutting tool;superhard cutting tool processing specification is not enough to guide the production practice.
Therefore, in addition to in-depth study on the machining mechanism of carbide cutting tools,we must also strengthen the training, the successful experience of demonstration of superhard cutting tool machining knowledge and strict operation regulations, the processing method of the high efficient, clean and more applied to actual production.
June 22, 2017
China is the largest country in the world for carbide saw blades production,whereas saw declines in the prices, so many manufacturers because of low profits and discontinued collapse, while the foreign blade is quietly nearly 100 times the price to enter the market and sold well China.In my opinion, there are two reasons for the poor quality of China carbide saw blades.
Welding is very serious
We have investigated most manufacturers of tusngten carbide saw blades in China and found that the manufacturers of Chinese saw blades are trying hard to improve the quality of their products. The most noteworthy is the low quality China saw more than 80% manufacturers of the main problems in welding and plate, I have received the test sent over a domestic company, in a completely new circumstances, actually have a 30MM crack plate, if the blade is as high as 3000~8000 speed, completely may appear surprising results, not to mention what a good cutting effect: Welding fastness low, alloy brittle, alloy from oxidation, solder joints and other undesirable phenomena (welding method China above saw manufacture factory is currently using 80% current welding).
Another reason is that the Chinese people's own grinding machine is not accurate enough.
Chinese why companies do not want to buy imported advanced automatic welding equipment and grinding equipment? We found in China carbide saw blades mainly in the production of a large number of low cost advantages, mainly rely on exports to make operating companies in foreign countries are used in most low-end industries, most of its profits to foreign enterprises to earn. In order to change the quality of products, some enterprises in China have to sacrifice large amounts of money to buy fully automatic high-frequency welding equipment.Among them,5% of the enterprises have purchased fully automatic high-frequency welding equipment imported from Germany, and 5% of them have purchased fully automatic welding equipment in japan. The companies that bought fully automated equipment bought equipment and found that millions of dollars were not exported to foreign countries.The reason is that the quality of the imported high frequency welding equipment has been improved, but the output has not been improved, and the original advantages of Chinese enterprises have been lost. Coupled with the depreciation of machinery and export transportation costs after the product cost is very expensive, and overseas local production of alloy saw prices equally matched. Then, with China's manual high-frequency welding equipment, the same minimum cost, can produce more than 35 times the output of the saw blade. Obviously, China's products will soon dominate the market in the world. The Chinese don't have to spend a lot of money to buy foreign saw blades. For example, investing in a fully automatic high frequency welding equipment imported from abroad requires 700 thousand RMB, with a production capacity of 1200 sawtooth / h.Invest 700 thousand RMB to buy manual high-frequency welding equipment produced in China, the minimum output can also reach 42000 sawtooth / hour.
June 21, 2017
Forcarbidesaw blades,to carry out the reasonable selection and collocation in order to better play its advantages,there is a very simple truth, saw blade tungsten carbidesaw blade manufacturing enterprises can not do so many specifications,according to the optimization principle and according to the current wood processing enterprises in the equipment, materials and other specific factors which currently used for tungsten carbidesaw blade the series of specifications.This will not only help us choose carbide saw blades,but also be beneficial to large-scale production of alloy saw blades manufacturers.
In general, sawing particleboard, MDF should be around teeth, sawing plywood, fireproof board generally choose ladder tooth (flat teeth, tooth combination).
Because the computer saws sawing rate,carbide saw blade diameter and thickness of the relatively large, about 350-450mm in diameter, 4.0-4.8mm in thickness, most of the ladder tooth, in order to reduce the edge collapse.
Sawing wood alloy saw blade, usually with inclined teeth around a, because this combination angle can be sharp, wood fiber cut, smooth incision.For the groove to maintain the bottom of the groove, you must use flat teeth, or use the left and right flat combination teeth.
Then, how do you grind thetungsten carbidecircular saw blades? Analysis of several important factors affecting the finish of the alloy saw blade.After reading this technical literature, remember the following 6 techniques, you can also wear a good saw blade.
Device saw blade
The first measurement of outer diameter of saw blade and the center hole, selected centering washers, then the blade mounted to the blade seat, then the knurled nuts saw seat lock, and then relax the blade seat locking screws, and move the saw blade base, the size of the outer diameter of the saw blade and the saw blade base scale corresponding alignment, then screw locking. If the blade has broken teeth or tooth, must use the guide disc. In general, using a relatively easy grinding grinding, should as far as possible the use of guide plate.
Rotation adjustment of circular saw blade
If the blade rotation without proper tightness, the forward displacement of the saw blade will not be allowed, so when the blade is installed in the left hand, the counterclockwise rotation of circular saw blades, the rotation of the elastic elastic,if improper,with M17 open wrench adjustment nut, the blade rotation of the elastic proper.The principle of tightness, in order to eliminate the inertia of the saw wheel rotation and the impact of the grinding wheel, can not be too tight.
Saw thickness adjustment
The center of the grinding wheel and the thickness of the saw blade should be in a straight line so that the grinding of the serration can be averaged up and down.
Cutting angle adjustment
Since the material to be cut is often changed, the appropriate cutting angle shall be selected according to the material of the cutting material. The method of adjusting the cutting angle is to loosen the clamping block screws first, then rotate the carbide saw blades seat base to the desired cutting angle, and then lock the clamping seat screws.
Tooth profile transformation
Generally, there are two kinds of teeth, one is triangular teeth, the other two are curvilinear teeth, and the teeth should be decided before grinding. Change the gear type should be in the machine running, with L plate hand change type change button, select the type of teeth to be grinding.
High-low tooth difference
Before grinding, you should decide whether to grind the high and low teeth. If you want to grind the high and low teeth, adjust the high and low gear adjustment lever to the required scale.
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