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.

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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

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August 23, 2017

Analysis of advantages of commonly used high precision carbide bits


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.

3.Proper cooling

(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.

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August 18, 2017

Development of long-lasting anticorrosion technology by thermal spraying


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.

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August 08, 2017

Several cases for grinding of carbide saw blade

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.

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August 01, 2017

Specialization of cemented carbides and functionally graded structural materials

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.

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July 27, 2017

Application of carbide cutting tools in automobile processing

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.

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July 12, 2017

Simple method for making tungsten drill bits on one’s own efforts

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.

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July 03, 2017

Research on cemented carbide end mills of Profile Based on its maintenance and selection

There are two main types of milling methods for carbide end mills' direction and rotation direction of milling cutter:
The first type is the milling,the rotation direction of the milling cutter and the cutting direction of the feed are the same, and the milling cutter holds the workpiece and cuts the final chip in the beginning of cutting.
Inverse milling,the second is the direction of rotation of the milling cutter and cutting feed direction is opposite,cutter before start cutting must be slipping a on the workpiece,start with cutting thickness is zero, the cutting at the end of the maximum cutting thickness.
When milling,the workpiece is pressed to the workbench by cutting force,and the workpiece is removed from the worktable during milling.Because of the best cutting effect of milling,it is usually preferred to milling,only when the machine has the problem of thread clearance and the problem of unsolved problem.
The cutting edge of carbide end mills should bear the impact load every time it enters the cutting.The load size depends on the cross section,workpiece material and cutting type of the chip. In the ideal condition, the diameter of the milling cutter should be larger than that of the workpiece, and the axis of the milling cutter should always be slightly away from the center line of the workpiece.When the cutter is placed in the cutting center, it can easily produce burrs. Cutting edge into the cutting and cutting out the direction of the radial cutting force will continue to change, machine tool spindle can vibration and damage, the blade may rupture and processing surface will be very rough, hard alloy cutter slightly off center, cutting force direction will no longer fluctuations, cutter will receive a pre load.
Maintenance of carbide milling cutter
When the axial line of carbide milling cutter or the edge line of the workpiece is superimposed or close to the edge of the workpiece, the situation will be serious,and the operator should do the relevant equipment maintenance work.
1. Check the power and rigidity of the machine to ensure that the required milling cutter diameter can be used on the machine tool.
2. The weight of the cutter in the spindle is as shortest as possible,reducing the impact of the milling cutter axis and the position of the workpiece on the impact load.
3. The suitable for the process of the correct cutter tooth pitch,to ensure that did not too much during the cutting blade mesh and artifacts caused by the vibration at the same time, on the other hand,in the narrow artifacts or milling milling cavity to ensure that there are enough blades and workpiece mesh.
Make sure to use every blade in order to get the correct cutting effect when the chip is thick enough to reduce the knife wear.The forward corner slot can be used to achieve a smooth cutting effect and minimum power.
5. Select the diameter of milling cutter suitable for workpiece width.
Choose the right major Angle.
Place the milling cutter correctly.
8. Use cutting fluid only if necessary.
Follow tool maintenance and maintenance rules and monitor tool wear.
The maintenance of carbide milling cutter can prolong tool life and improve work efficiency.
Choice of carbide milling cutter
Milling stainless steel in addition to the vertical milling cutter and cemented carbide end mills and the parts of the cutter material,the rest of the all kinds of milling cutter adopt high speed steel, especially high tungsten, molybdenum and vanadium high speed steel has a good effect, the tool life than W18Cr4V 1 ~ 2 times. The hard alloy plate for making stainless steel mill is YG8,YW2,813, 798, YS2T, YS30, YS25, etc.
The effect of spray cooling method is most obvious,which can increase the durability of milling cutter more than double. If the normal 10% emulsion cooling is used,the cutting fluid flow should be guaranteed to be fully cooled. When the carbide milling cutter is milling stainless steel, the Vc = 70 ~ 150m/min, Vf = 37.5 ~ 150mm/min, and it should be adjusted according to the alloy plate number and the different materials.
The adhesion of stainless steel and strong melting ability are easy to stick to the blade of the milling cutter,making the cutting condition deteriorate. In reverse milling, the blade starts to slide on the hardened surface, increasing the trend of working hardening.The impact and vibration of milling are larger, and the cutter blade is easy to be broken and worn.
When machining stainless steel, the cutting edge should be sharp and bear the impact. Can use the big spiral Angle cutter (cylindrical milling cutter, end mill), spiral Angle b increased from this, the tool life can be increased by more than 2 times, because work at the moment of the milling cutter rake Angle g0e by 11 ° increased to more than 27 °, milling fast. But b value should not be again big, especially the vertical milling cutter with b 35 ° or less advisable, so as to avoid weakening the blade.

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June 28, 2017

Carbide cutting tools are not widely used in production

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.

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June 22, 2017

The reasons why carbide saw blades are poor quality in China

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.

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June 21, 2017

What are the selection of various parameters of carbide saw blades?

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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June 14, 2017

The age of tungsten carbide drill bits is forthcoming

In the late 1980s, the main part of the drill used in all walks of life was a roll bit and a high speed steel drill.Of course, there are companies that are working on the "tungsten carbide drill bits". There was already a hard alloy bit on the market, but for technical reasons, it was limited to a large diameter bit. At that time, we have already foreseen the carbide path bit time must come, so only in a count of primary production is started development work in the corner. First, in order to make the drill bit, it must not be solder, it must be the integral bit. But, at that time, a lot of data need to manually calculate, for example, the ideal of groove shape design, shape of cutting edge design, etc., failure and repeated the test. In other words, it is now very common on the premise of data and the simulation of product development, at the time it is impossible, only by technical personnel's experience and feelings. After several years of development, the first bit of the "ZET1 bit" was born in 1987.

The quality of the carbide bit is good

It is important to note that, by the quality of tungsten carbide drill bits type and stratigraphic lithology, to speed up drilling speed and improve the single bit footage plays an important role. Drill more than a mouthful of oil and gas Wells typically use different size of the drill, the drill and the diameter of upper strata to use the drill bit, by bit drilling soft stratum, single bit footage, use the more time is short, a bit general reusable several Wells; In the lower strata of the drill, the smaller bit is used for the drill, and the drill is usually used with a bit of drill. The drill footage of a new drill bit depends mainly on the size of the drill, the type of the drill, the hardness of the formation and the fit of the drilling parameters. Generally speaking, the smaller the bit, the harder the ground, the less the footage. The larger the bit, the softer the ground, the more the drill bit.

At the time, about 70 percent of the market's customers were still using high speed steel drills, but we had confidence in the overall bit "ZET1 bit". Compared with the previous product, its processing efficiency is improved 5 times longer life expectancy, tools to 10 times, scraps discharge stability, excellent processing performance, can achieve a qualitative leap. However, the reality is the opposite of expectation, and the sales situation is not optimistic, for one reason is the price. Compared with the high speed steel drill, the price is about 30 times the price, and the product, which used to cost just 500 yen, now costs 15, 000 yen. Although the cost of each hole will eventually decline, and also can improve production efficiency, but the price is hard to let the customer accept the advantage of carbide bits  as a whole. Another reason is that the method and methods of using the whole drill are not known and must be trained from scratch. At that time, the introduction to use of the overall tungsten carbide drill bits no pause of machine tools, there are few customers and machine tool manufacturers also help us to use a method to the customer together. Many reported that some customers to use the method of high speed steel drill bit to use cemented carbide drill whole, result the collapse edge, so we to each customer to provide the detailed information. In addition, unlike the high speed steel bit, the drill is not considered to be ground again, so the combination of hard alloy tools also needs to be taught to the customer. The sales activities very to spend time with knowledge, but through these practical activities, finally will "ZET1 bit" in the auto industry as the center of the spread between the masses of customers. In retrospect, after the hard, finally won the customers for our understanding of the product advantages and praise, this kind of achievement feeling now I remember.

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June 09, 2017

The influence of material of wire drawing dies on the length of sizing tape

In order to form a lubricating coating thicker in the surface of steel wire, lubrication cone surface does not need to be polished, in order to increase lubrication pressure, work cone is crucial part of the core structure, forming wire surface lubrication layer and plastic deformation in this area, working efficiency of wire drawing dies also depends on the geometry and work cone area, it must ensure that the work cone angle of the machining accuracy and surface finish.The work should be processed into linear cone type,the surface shall not have arc transition or smooth transition, and the work cone angle and sizing zone should be kept in the same axis, die diameter and die diameter should be concentric,so that can prevent elliptic phenomenon in wire drawing. The sizing effect is to control the wire diameter, roundness, parameters of flatness and surface quality.

In order to ensure product quality, sizing surface needs to be polished, and the sizing and cone and outlet cone interface remain parallel to each other, and strictly control the sizing tolerance. The sizing length is decided by drawing materials and mold materials, but is mainly determined by drawing materials. In general, the high carbon steel, the bearing length is about 25% of the diameter of a 35%, for soft materials (copper), sizing zone length is generally 50% of the diameter of a 100%.

In addition towire drawing diesmaterials on the sizing zone length will also have a certain impact, the friction coefficient is relatively large, the sizing can be a little shorter; the friction coefficient is small, allowing the sizing is a little long, such as natural diamond die sizing is generally 35% of the diameter of wire drawing die a 50%. short sizing belt, under normal use, but not allowed to wear work cone, wear sizing, sizing with belt wear, sizing belt will gradually increase, overheating drawing, burning powder lubricant, lubricating failure, and can lead to transformation of wire rod surface but at low speed; drawing, length and diameter of wire drawing die material with the heat deformation can soften the lubrication powder, and fluid boundary lubrication formed on the surface of steel wire. So the bearing length should be selected according to the drawing material, mold material, lubricating powder and drawing The process was determined by experiments.

The exit cone tapered design is intended to strengthen the export of wire drawing dies,die to prevent crushing, exit cone requirements for polishing treatment, and sizing with mild and smooth transition at the junction of the exit cone, metal debris or wire may scratch the surface and produce a large amount of pollution when drawing, lubrication powder, and may lead to obstruction of a mold population, cause the failure of drawing lubrication in the future.

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June 02, 2017

Cutting utilization rate of cemented carbide inserts is widelt used in China

Cemented carbide inserts are more and more widely used in metal cutting machine industry, as is known to all, the hard alloy is an alloy material, and is more difficult to melt the hard compound metal, and metal bonding, and then through the manufacturing process of metallurgy. Therefore, the hardness of cemented carbide is not only high, but also has good wear resistance, toughness, patience and corrosion resistance. Especially the high hardness and wear resistance of carbide inserts is very practical, even at five hundred degrees of high temperature will not change, at one thousand degrees of temperature, hardness is still a lot. Cemented carbide blades are second only to diamond, and hard alloy blades have excellent bending strength, as well as impact toughness and corrosion resistance, which are common to alloy blades.

In the use of cemented carbide cutting tools together,to promote the circuit board needs cutting speed, not too hard or too quickly, otherwise the circuit board and the blade will collide, causing the blade damage, there may be serious accidents.

The prosperity and development of the socialist market economy is the best embodiment of keeping pace with the times. As one of the most hard cutting tools, cemented inserts is a powerful cutting tool in the production and processing industry.Cemented carbide,as the tooth of modern industry, has a strong promoting effect on the manufacturing industry.

Cemented carbide inserts, as a cutting tool of wealth, is the most effective processing tool in modern manufacturing industry, and plays an important role in promoting social and economic development.carbide inserts belongs to powder metallurgy industry. It is a kind of alloy material made of refractory metal hard compound and bonding metal by powder metallurgy process.Cemented carbide has a series of excellent properties such as high hardness, wear resistance, strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance become the most important use. Chinese as hard alloy producer, is the world's manufacturing power, cutting of cemented carbide tool utilization rate is the most widely used, is the world's hard alloy cutting tools market share the most adequate positions, all countries are in the production of cemented carbide Chinese market as a long-term goal, this is both an opportunity and a challenge for us.

The requirement of economic globalization makes the increasingly fierce market competition show the obvious effect of survival of the fittest, and the development of cemented carbide blade market also needs to keep pace with the times and go on the front line of economic development. Chinese "12th Five-Year" planning has a significant guiding role to the social economy, especially on cemented carbide inserts, hard alloy tools using demand in front of the high-end equipment manufacturing industry, domestic cemented carbide blade performance advantages plus the times is more and more obvious,Chinese cemented carbide industry is going from production power to power production.

The rapid development of social economy is the economic globalization reflect the increasingly obvious, the biggest achievement is the reform and opening up with the times, hard alloy blade with the times is the inevitable direction of the development of the whole hard alloy industry, market competition is the most direct expression.

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May 31, 2017

Technological measures for preventing carbide inserts from grinding crack defects

Carbide inserts has high hardness,high brittleness, poor thermal conductivity, heat shrinkage rate, usually should be grinding with diamond grinding wheel with diamond grinding wheel. But the price is expensive, not easy to wear after repair, so many factories still use the ordinary grinding wheel for grinding.In the grinding process, the higher in hardness. Ordinary wheel, abrasive easily passivated, sharp blade surface friction to produce local high temperature, the formation of additional thermal stress caused by thermal deformation and cracks, directly affect the service life of the cutter and machining quality.Therefore,we should take the necessary measures to prevent grinding cracks. Through processing practice, summed up the technological measures the following can effectively prevent or reduce the grinding crack.

1.negative edge grinding method

Negative grinding method refers to a sharpening tool, first in the rake face or flank grinding out a negative edge. The hard alloy belongs to brittle materials, the grinding wheel vibration due to the cutting tool by impact load, prone to crack; at the same time, the instant heating and cooling the grinding zone the thermal stress may exceed the strength limit of cemented carbide and hot cracks. The negative edge grinding method can improve the strength ofcarbide inserts, blade to enhance anti vibration and impact load bearing capacity, and increase the heating area, to prevent the grinding heat large guide blade, so as to reduce or prevent cracks.

2.wheel with molybdenum infiltration

At room temperature, the powder and ethanol mixed solution made of molybdenum disulfide, then in a sealed container (to prevent evaporation of ethanol) will be the new ordinary wheel soaked in the mixed solution, removed after 14 hours, natural dry for 18 to 20 hours, the grinding wheel grinding wheel dry completely.By the treatment with internal voids of molybdenum disulfide the abrasive grains can lubricates the grinding wheel chip is good, is not easy to be blocked. The test proved that the grinding hard alloy blade with molybdenum wetted, sharp grinding, abrasive easily passivated, the deformation of the workpiece is small,smooth chip, chip shape with a band, take away most of the grinding heat. In order to improve the grinding effect, improve the blade yield.

3.reasonable selection of grinding parameters

If the excessive friction in the process of grinding, the grinding temperature can lead to a sharp rise, hard alloy blade is prone to burst, so the reasonable selection of grinding parameters is very important. The reasonable grinding parameters commonly used for circumferential speed of v=10 ~ 15m/min, =0.5 ~ 1.0m/min longitudinal feed f f =0.01 ~ 0.02mm/,horizontal stroke. Manual grinding. The longitudinal and transverse feed are not too large.

4.other technical measures

The knife rod rigidity tool holding spindle instability,beating can cause grinding cracks, therefore, by machine,grinding,machining system of fixture and tooling composition should have sufficient rigidity, and should control the grinding wheel axial and radial runout.

There are many factors caused by carbide inserts produce grinding crack,only choose the appropriate grinding wheel,the grinding process is reasonable,which can effectively avoid cracks, improve the grinding quality.


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May 27, 2017

Carbide dies as high-quality dies are developing towards high-end market

The cemented carbide dieshas basically been serialized and standardized. From the development of recent years, the research and design theory of cemented carbide die in China has been further, more scientific and more widely applied. Along with the rapid development of social economy and science and technology, with the tide of economic globalization, China on equipment manufacturing industry especially the high-end equipment manufacturing industry put forward new requirements, the development of high-end equipment manufacturing industry in China, the corresponding mold and the equipment manufacturing industry is closely connected to the standard industry, high-end hard alloy mould products market needs and requirements attendant. Industrial developed countries attach great importance to the development of standard parts for high-end cemented carbide die, especially high quality carbide mould standard parts. Mold standard parts can guarantee the quality of industrial products. As China's economy has entered a stable period, the gradual optimization of industrial structure, the quality of industrial products like requirements is also more and more high, this to the standard mold requirements are increasingly high, hard alloy mould China mold standard parts to the high-end market is the inevitable trend of development.

Cemented carbide dies is a very important alloy product. It can be used in many places, such as cutting tools, and it is also used in mining and road engineering. It has a very good hardness, and very wear-resistant, but in the process of use, there are many places to pay attention to. Before using the carbide die, read the relevant information in detail, and be proficient in the operation so as not to panic in case of an emergency. Secondly, in the process of normal operation of the machine, it is necessary to make good monitoring of the equipment status, and if it fails, it can be found and eliminated as soon as possible. It is also important to note that the operator should wear overalls and work caps to prevent accidents. In the process of machine operation, especially in the process of moving, you should pay attention to the surrounding environment, and avoid trees such as trees, wires and so on.

Uninterrupted operation of cemented carbide dies in practical applications often has a long time, so the equipment in use for a long period of time even after the failure should be suspended for a period of time, and do a good job of equipment inspection and maintenance work to ensure the normal operation of the machine.

Forming manufacturing technology and processing technology, mold manufacturing process of modern hard alloy has been very simplified,the standard mold parts, not only the accuracy, quality has been able to meet the requirements of assembly, and can purchase from the market, forming a blank, including forging, rolling template, can also purchase from the market.

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