September 29, 2017

Tungsten carbide nozzle for petroleum drilling

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.

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September 26, 2017

How to realize easily the low wear of carbide drills

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.

 

Processing situation

 

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.

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September 22, 2017

Manufacturing process of tungsten carbide blades

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.


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September 19, 2017

High-end manufacturing to promote the development of carbide cutters

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.

 

 

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September 15, 2017

Present situation and development of cemented carbide bars

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

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September 13, 2017

Selection and use of tungsten carbide drills bits

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.

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September 05, 2017

Methods for changing cemented carbide cutter into small milling cutter

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.

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September 01, 2017

Anti-oxidation coating for niobium tungsten alloy

As refractory metal,niobium has been used in aerospace industry.Niobium tungsten alloy with high strength at high temperatures and at room temperature and has good plasticity, available conventional forming technology made into all kinds of processed materials and parts, used in the shuttle's skin, nuclear reactor engineering, jet engine parts and space power generation system thermal radiation panel and tubes, etc. Niobium tungsten alloy is used in the related supporting facilities of chang 'e 3.The new niobium tungsten alloy developed by ningxia dongtantalum industry has been successfully applied to the "xinno 6" and "moonshot engineering". Niobium tungsten alloy destructive oxidation happens in high temperature aerobic environment, need through the alloying coating modification and coating protection,high temperature but alloying modification will seriously affect the mechanical properties, so the alloy coating on the surface of the coating protection become a research focus,surface coating of high temperature oxidation resistance directly determines the shuttle engines with niobium tungsten alloy working temperature. The silicified coating was prepared with the preparation of niobium tungsten alloy with niobium tungsten alloy. They developed the niobium tungsten alloy Nb521-1, the main component is 5w-2mo - 1Zr, the rest is Nb. Coating preparation process is as follows: Si, Ti, Cr powder mixed in certain proportion,add a certain amount of organic solvent, load the corundum tank, the use of ball mill mixing and drum rotational speed, 200-300 r/min, corundum ball 5 -- 10 mm in diameter, the ball material volume ratio 1:1, ball grinding time 24 h,after mixing viscous suspension slurry system.Slurry evenly coated in niobium tungsten alloy base material surface, placed in a vacuum sintering furnace in 1320-1320 degrees in the heat preservation 18 to 40 min, repeat the above operation after a coating sintering for secondary coating sintering, coating. They found that the alloy coating will appear in the process of preparation and use of coating accumulation,stacking area coating surface is obviously different from other normal region, accumulation of a bit accumulation and line two kinds of surface defects. The coated slurry is mixed with coating material, and the coating material is deposited on the coated surface of the coating. In the process of melting, when the coating appears to fall off, the shedding area exceeds the self-leveling ability of the remaining slurry, which will generate the line accumulation and the surface defects associated with the leakage.The comparison of the spectra of the coating in normal region and accumulation area shows that there is no significant difference between the composition of the coating area and the composition of the normal coating. The accumulation coating is consistent with normal coating structure,consisting mainly of outer layer,main layer and diffusion layer.Normal coating thickness is 120 microns, point accumulation coating thickness is 120 microns, and line stacking area coating thickness fluctuation is bigger, thicker coating area and other area of about 50 microns thickness difference.Accumulation is coated particles embedded has a little influence on the coating surface and the cross section,and line accumulation is superposition of slurry in the process of coating preparation,although does not affect the structure of the coating, but has a great influence on the thickness of the coating area. Static antioxidant 1800 degrees and 1600 degrees thermal cycle life of contrast test showed that the accumulation point coating with normal coating were similar,which means that under the condition of the experiment,accumulated points won't cause bad influence on coating performance;But line accumulation generally have a coated surface defects such as leakage, associated test and high temperature, when the workpiece surface is leaking area, the workpiece substrate directly exposed in the air, will inevitably lead to artifacts in leakage besmear in rapid failure.Therefore, the effect of line accumulation on coating performance can only be removed by refilling the leakage area. for more details,just visit our website www.wococarbide.com

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