May 29, 2018

What should I pay attention to when buying metal circular saw blade

Metal circular saw blade is a very important part of cutting equipment, the factors to consider when choosing to buy has a lot of, especially the stability of the cutting and quality, and the most important is the wastage of the cutting, it is closely connected with production profit and quality.

What specific matters should enterprises pay attention to when purchasing?

Selection of various parameters

Metal circular saw blade of any kind of specification has the specific sawing parameters and the corresponding sawing objects. When selecting, it is necessary to clearly understand the sawing materials.

1. Select the number of teeth of metal circular saw blade

The number of teeth is determined according to the materials and equipment of sawing, such as hollow pipe, wall thickness, diameter, etc. A lot of people may think that more teeth is better, but that's not the case.

2. Selection of blade diameter

The diameter of metal circular saw blade needs to be related to the cut material. First, the cut material is determined, then the suitable equipment is selected, and finally, the size of saw blade is selected according to the above situation.

3. Selection of types

Different kinds of metal circular saw blade, the cutting effect is also different, such as high speed steel saw blade, the cutting pipe effect is very good, of course, also can cut iron, copper, stainless steel, aluminum, etc.; The tungsten carbide saw blade is specially used for sawing wood and aluminum profiles, and finally cold saw blade, which is currently a kind of saw blade for high speed metal circular saw machine.

4. Thickness selection

As for the thickness of saw blade, it cannot be said that the thinner the better. Too thin will lead to instability, and too thick will lead to more serious loss of saw cutting.

Quality selection

When purchasing metal circular saw pieces, the most important part is quality. How long is the service life? What is the cost of a single saw cut? How stable is the sawing? Wait is all we need to consider.

Followed by the brand, the brand can represent the quality and service, again good a saw blade, it is impossible to do without any problem, which requires the service to support, there is no perfect service, the user will not buy at ease.

The last is the integrity of an enterprise, there is no good faith again good product can't go to work with, there are too many uncertain factors, metal circular saw blade is a kind of consumables, often can buy used, I don't believe that a company like change suppliers, if the good faith, believe that the quality of metal circular saw blade also not bad.

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May 25, 2018

Failure reason analysis of cemented carbide cutting picks

Cemented carbide cutting picks are generally divided into two types: cutter teeth (also called radial teeth) and pick teeth (also called tangential teeth).
The pick shape cutter tooth structure is simple, can click on the coal, turning deep, automatic sharpening, often in the course of work keep sharp teeth, coal winning machine load is relatively stable, so than knife cut tooth less energy consumption, long life, and small amount of coal dust, coal quantity is big, suitable for use in hard coal.

In a spiral drum coal mining machine, the gear cutting motion on the spiral drum is the combined motion of the rotation of the spiral drum and the horizontal swing of the cutter arm.

Trajectory for plane of cycloid, this work is divided into a cone, while working as picks wedge into the coal and rock, carbide cutter tooth wedge into the coal and rock in an instant, tooth cone surface of coal and rock pressure exceeds the compressive strength of the coal, the coal and rock crushing, as the pick shape of the cutter tooth wedge, the tension of coal rock mass is more and more big, until pick shape cutter teeth around the segment from the coal and rock breaking down.

The cutting teeth bear high pressure stress, shear stress and impact load when cutting coal rock. Coal hardness is not high, but there are coal gangue and other hard mineral aggregate, and in the process of coal mining and drilling, cutting tooth temperatures will rise sharply, leading to tooth top material softening, accelerate the failure process of the cutter tooth.

Cutter tooth in the process of work, the abrasive (gangue, etc) between the cutter tooth surface and produce larger compressive stress, with sharp edges and has a right Angle abrasive cutting cutter tooth surface formation micro cutting. If the grinding grain is not sharp enough or the Angle is not appropriate, the furrow will be forced out on the surface of the cutter tooth.

With the extension of cutter tooth working time, the abrasive surface of cemented carbide cutting picks push repeatedly, severe plastic deformation of the flow, make the surface of the lower interact, increase plastic deformation dislocation density in the area, surface crack, crack extension, foliated chip cutter tooth surface formation.

And corrosive medium exist in the coal seam and cutter tooth surface chemical reaction caused by the surface material corrosion, mechanical performance, and reduce the surface metal bonding force with substrate material, speed up the cutter tooth material surface wear.

In addition, when cutting tooth cutting coal and rock, bear the impact load of high intermittent, under the action of impact load, the cutting tooth surface harder micro convex point deformation, repeatedly squeezed in nearby soft surface to produce plastic flow and in cutting tooth surface formation accumulation, again and again of elastic-plastic deformation, and the dislocation concentrated, which in turn micro cracks appear on the surface transverse. After wear, the area of the cutting part increases, which increases the cutting resistance and reduces the cutting strength.

When the cutter head is worn to a certain extent, the carbide tip will fall off. The cutting teeth after the tip of the hard alloy teeth have been completely invalid. A large number of statistical analysis showed that the failure modes in accordance with the degree of order are: cutting teeth tooth head wear after cemented carbide tooth loss, broken tooth, tooth body bent or broken, the cutting tooth tooth head wear failure of tooth loss about 85%.

So, in order to improve the service life of cemented carbide cutting picks, first of all to ensure gear tooth surface has enough head of wear-resisting, corrosion resistant, shock resistance, at the same time increase the cutting tooth the tooth body strong toughness (using biya cutter tooth processing equipment, cutting teeth, welding equipment, cutting gear quenching equipment), can effectively extend the service life of cutting teeth.
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May 18, 2018

Optimum design of cemented carbide cutting tools

To reduce the manufacturing cost of cemented carbide cutting tools, can control the tolerance zone of the product, for the law Angle is greater than the sharp edge of product design of protective units, straight negative Angle blade design around the size can be directly mould pressing M class precision grade level, combined with modern high precision mold manufacturing technology and precision pressing technology, the material cost and artificial cost, machine cost three aspects comprehensive save the purpose of the cemented carbide product manufacturing cost by 1% ~ 3.5%.
Ever since the first pieces of cemented carbide cutting blades, since its launch in 1927, in order to optimize the blade cutting performance, relevant enterprises in the field of metal cutting has been constantly developing innovative blade geometry and into crumb structure. These design innovations, along with the continuous improvement of the matrix materials, make it possible to make the workpiece materials with higher hardness and higher strength.
The continuous efforts to optimize the cutting process complement the technological progress of machine tools which can improve the processing speed. At the same time, the performance advantage of the modern machining center also puts forward higher requirements for tool manufacturers. Now, they must provide more advanced tool and blade geometry to meet the requirement of metal removal. In addition, the price of hard alloy is rising rapidly worldwide, which puts a lot of pressure on the cost and benefit of the tool manufacturer to develop the product.
These two factors contribute to the emergence of innovative tool products and extend their cutting performance advantages to a wider range of processing areas. These innovative tools can greatly improve the feed rate, reduce the cutting force and save cutting fluid, making it suitable for the modern golden cutting machine with fast speed and light frame structure.
Reliable grip of blade
In the cutting process, it is possible to shift the blade under the action of cutting force to ensure that its automatic clamping position has become one of the main factors that affect the cutting performance of the tool. It is not surprising, then, that many tool makers are investing a lot of resources to optimize the blade grip technology.
Iscar company developed a blade clamping mechanism can reliable clamping has double negative prismatic shape after the double-edge blade of cemented carbide cutting tools, the dovetail cutter holder and the surface of the blade after a prismatic shape can prevent the blade under the effect of cutting force up, cock to ensure with double dovetail prismatic blade of the knife after the correct orientation and firm clamping.
In order to effectively improve the productivity and profitability of machining, now of the indexable insert is used in a variety of optimized geometric blade and the blade clamping mechanism, in order to ensure accurate cutting Angle, good chip control and processing stability of surface quality, reliable, and the use of the latest possibility of substrate material processing all types of workpiece materials.
Finally, if a blade does not reach optimal cutting performance, some evidence can be found to help determine the solution. Using a magnifying glass to carefully observe the blade's cutting edge reveals the essence of the problem. If the inspection indicates that the blade has obvious abrasive wear or slight deformation, it indicates that the blade has a low hardness and needs to be replaced with a higher hardness number. If the blade is broken and the cutting edge appears small, it may be necessary to switch to a lower hardness and better toughness. By understanding how cutting blades are made of, and how for a specific processing customized blades of different grades, you can take a variety of targeted measures, to improve the machining efficiency and reduce cost.

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May 17, 2018

Design and improvement of tungsten carbide boring bar with chip removal

Tungsten carbide boring bar is one kind of boring tool, usually round handle, also has larger workpiece use square tool pole, the most commonly used place is the inner hole processing, expanding hole, copying shape and so on. One or two cutting parts, specially designed for rough machining, semi-finishing or finishing cutting tools for existing holes. Boring tool can be used in boring machine, lathe or milling machine.
The machining process includes the machining and semi-finishing of the hole in the blind hole, which can only be solved by the inner chip deep hole boring tool. In the production site, there are the following disadvantages of the deep hole boring cutter with embedded carbide inside the carbide, which is narrow, and the chip is not smooth and easy to be blocked. The support is easy to wear, the diameter is easy to change; The size of the cutter is large and significant. Therefore, it is necessary to improve the deep hole boring tool in the series.
Whether the product structure and production feature, when processing need to follow the following principles: for processing tolerance zone, code-named H11 high strength alloy steel and high-strength aluminum alloy cylindrical deep hole parts as the main processing objects, and determine the application of deep hole boring cutter size and other main parts of the diameter size; From the existing machine tools in the factory, the size of the connecting part is unified, and the cutter bar size is reduced. The hard alloy blade adopts the general model and number of the national standard.
Design structure improvement
Chip in deep hole boring cutter is a kind of single edge cutting tool, cutting through the boring cutter and cutter bar inside the hollow out, is mainly used to expand the existing hole hole or blind hole, steps and fix its axis is not straight. Chip in deep hole boring cutter has the following characteristics: 1. cemented carbide welding blade on the blade or the knife pad, briquetting and screw compression in the blade head, welded blade not replaced, blade wear can be replaced after installation; 2. the hard alloy guide bar through cant take briquetting pressure and fixed on the boring cutter body, and the cutting plane across 90 degrees and lower differ with cutting edge installation groove, and cooling fluid pressure for lift force generated by offsetting radial and tangential cutting force, the layout and structure of single edge cutting force along the cutting edge is round shape; The tungsten carbide boring bar body is connected by single rectangle thread and cutter bar.
The welding structure of the traditional boring tool is made of cemented carbide blade. Remove the supporting part of the bakelite, adopt the lengthened hard alloy guide strip, and the guide and support function, the cutter body structure is simple, enhance the durability. Expand the chip removal channel to eliminate the blockage and remove the debris.
It is proved by repeated practice on the production site that the formation of cuttings and the effect of cuttings are directly related to the life and quality of the boring cutter. The main factors that influence the cuttings are the physical mechanical properties of the processed materials, the geometrical parameters of the tool and the cutting amount. After determining the machining object, the size of the cutting table of the boring cutter and the size of the walking knife are the main functions.

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May 11, 2018

Many cemented carbide indexable tools are gradually replacing the forming tool

In some cases, the repair of a indexable insert may not be worth the cost. EMUGE provides repair services for its own taps, end mills and thread mills. Although the tap can be resharpened, its geometric shape is much more complex than other tools such as the drill. The inconsistency between the new tool and the repaired tool is one of the reasons for the problem. However, there are also large parts (such as the oil field blowout preventer with a diameter greater than 25mm) that is often used to process the repaired tap. Much depends on the user and the processing technology. One of the key tricks of tool repair is to know when to stop using fixed tools. Everyone's situation is different. One auto parts manufacturer USES a tap to fix the taps for 2,000 to 3,000 holes. Each tap can be reused three times. But if he USES the tap to complete the damage and delivers the repair, the taps may only be able to process another 1,000 holes. Some users will stop using the tool before it breaks or the cutting edge is seriously damaged and will be sent to repair. This should be done for any tool that intends to repair reuse. If the tool is repaired before the insert is broken or badly worn, it is necessary to remove less of the tool material in the regrinding process.

In some cases, many indexable tools are gradually replacing the forming tool. Due to the transposition function, the initial purchase price of this tool is also quite high, but the user does not have to pay the cost of repairing the tool. In the case of conditional permission, the end milling cutter may replace the whole round milling cutter.

Although it has a good application prospect, it still has reason to choose the solid carbide bit when machining the high quality hole with high surface finish and dimension precision. The design ofindexable insertor replaceable cutter head is increasing, but the solid carbide round tool still has its use. Another limiting factor for indexable cutting tools is the need for space for clamping inserts. When the tool diameter is less than a certain limit, the integral tool is the only feasible solution.

Another key factor in increasing tool repair costs is the need to track and deliver the additional tooling inventory required in the repair process. This increases the complexity of managing tool repair processes, especially in complex high-tech production environments. First, there is a logistics process for collecting, packaging, and sending the tools to be repaired and to recover the repaired tools. Then you need to determine the difference of the repaired tool. In addition, it is essential that they be properly tracked or classified so that they can be used correctly for processing. In particular, the vertical milling cutter, for example, will be sent to repair by a vertical milling cutter with a diameter of 12.7mm. The diameter of the cutter returned after the repair may be reduced by 0.51mm or 0.76mm. In order to guarantee the machining quality, the offset of CNC machine tool must be adjusted appropriately.

Related link: http://www.wococarbide.com/Library/libraryinfo/id/1217

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May 07, 2018

Matters to be paid attention to when grinding carbide cutter

In the process of cutting, the cutting edge of the carbide cutter will be blunt and the cutting ability will be lost because of the sharp friction and the cutting heat of the knife surface. Only through grinding can the cutting edge sharp and the correct angle of the cutter be restored. Therefore, the lathe operator should not only know the cutting principle, but also select the tool angle knowledge reasonably.

When the carbide cutter is blunt, it must be sharpened to restore its reasonable shape and angle. The cutter is usually sharpened on a sand turbine. Grinding high speed steel tool with white alumina grinding wheel, grinding carbide turning tool with green silicon carbide grinding wheel.

When the carbide cutter is regrinding, it is possible to grind the relevant blade surface according to the wear condition of the carbide cutter. The general sequence of tool sharpening is as follows: grinding surface, grinding side, flank face, grinding surface and grinding wheel. When the carbide cutter is sharpened, it is also used to grind each knife face with oil stone. Thus, the service life of the turning tool can be effectively improved and the roughness of the workpiece surface can be reduced.

The position and method of grinding the carbide cutter are:

People stand on the side of the grinder to prevent debris from flying when it breaks.

The opening distance between the two hands is held, and the two elbow is clamped to the waist to reduce the jitter during grinding.

When grinding the main and secondary cutter surface, the carbide cutter should be placed in the horizontal center of the grinding wheel. The tip of the knife should be slightly upwards about 3 ~8 degrees, and the wheel should move horizontally in the left and right direction after contact with the grinding wheel. When the carbide cutter is away from the grinding wheel, the carbide cutter needs to be lifted up to prevent the sharpened blade from being bruised by the grinding wheel.

When grinding the cutter face, the end of the cutter head deviates from the angle of a main deflection to the left side, and the angle of the cutter shaft tail crosses the right side to a side deflection angle when grinding the flank face.

When the grinding tool tip is circular, the front end of the carbide cutter is usually supported by the left hand as the fulcrum, and the tail of the carbide cutter is rotated with the right hand.

When grinding the tool, we should pay attention to the following items:

(1) when sharpening, the two hands should stabilize the carbide cutter, and the cutter bar depends on the bracket, so that the worn surface is lightly attached to the grinding wheel. Do not exert too much force to avoid crushing the wheel and cause accidents.

(2) the sharpening tool should be moved around the circumference of the grinding wheel to make the grinding wheel uniform and no grooves. Avoid rough grinding of the carbide cutter on the two side of the grinding wheel, so that the wheel is forced to swing, beat, or even break.

(3) when the cutter head is heated, it should be cooled by water so as to avoid the annealing and softening of the cutter head due to the high temperature rise. When grinding carbide tools, the blade should not be covered with water so as to prevent the blade from being chilled and crack.

(4) do not stand on the front side of the grinding wheel to sharpen the carbide cutter to prevent the operator from being injured when the wheel is broken.

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May 04, 2018

tungsten carbide drilling reamer

The high hardness and high strength of the workpiece are the main reasons for the cutting edge and short life of tungsten carbide drilling reamer blade. It is mainly reflected in the following aspects:

(1) the main deflection Angle of the reamer cutting cone is small, the cutting width is large, and the radial cutting force is large when cutting, so it is very easy to cause the blade of the reamer blade.

(2) in the process of quenching steel, the front Angle of the reamer should be negative, which will increase the strength of the blade and reduce the collapse.

(3) replace the material of cemented carbide blade, preferably select ultra-fine grain carbide blade to ensure high hardness and good strength.

(4) strict control of hinged margin. Because the ream allowance is too big, will increase each blade cutting load, destroyed the stability of the process of ream, and increased the cutting heat, make the diameter of the reamer swell, aperture has been expanding, the surface roughness of the processing quality is poor.

Major changes are made in the following aspects:

(1) adjust the size of the reamer properly. When using tungsten carbide drilling reamer machining hardened steel hinge holes have a certain amount of shrinkage, depending on the size of the hole, shrinkage rate is generally 0.005 ~ 0.02 mm, so the reamer tolerance zone up appropriately, and keep the correction part of the front end with 6 mm long cylindrical blade, the backend to make 0.01 mm inverted cone, in order to reduce friction on the surface of the blade and is ream, try to avoid surface damage.

(2) shorten the length of the reamer to improve the overall rigidity of the reamer. In the case of ensuring the depth of the reaming, shorten the length of the reamer properly, and keep the distance between 15 ~ 20mm from the end surface of the spindle.

(3) appropriately increase the diameter of the blade section to improve the rigidity of the reamer, while at the same time, in the external grinding process, the knife will be rounded to the outside, ensuring the coaxial degree of the blade and Morse taper shank.

(4) increasing the reamer cutting cones Angle, increased from the original 15 ° to 30 °, and radial cutting force to reduce the cutting width.

(5) the reamer Angle from 3 ° to 10 ° before (in front of the blade offset 1 mm), can protect the blade reamer blade does not crack.

(6) after reamer cylindrical blade Angle from 15 ° to 8 °, and retain cylindrical blade with 0.1 ~ 0.15 mm.

(7) in cutting cone grinding reamer law Angle, back from the original tool grinding process to shovel grinding process, namely blade back to curve, can increase the strength of the reamer cutting cones, reduce the reamer blade cutter tooth crack. Reamer cutting Angle of cone method backward shoulds not be too much at the same time, choose to 7 ° when machining hardened steel, shovel mill when actual value is 1.1 K.

( change the carbide welding blade model from E518 to E315, and increase the blade thickness from 1.5mm to 2mm to improve the blade strength.

(9) carbide blade material is changed from YG8 to YS8 or YT726 suitable for processing quenching steel. That is, the blade hardness is increased from 89HRC to 92.5hrc, which greatly extends the life of reamer.

(10) properly reduce the hinged margin and reduce the cutting load. Increase the original value of 11.7mm hinged bottom hole to the value of 11.8mm, that is, the hinged margin will be reduced from 0.3mm to 0.2mm, so as to improve the quality of reaming holes.

By users to use the improved reamer, after more than 20 sets of mold in continuous processing, remove the blade reamer observation, no collapse edge, only slight traces of wear, still can continue to use, reamer life was improved.

For the improvement of carbide taper shank machine reamer, the following requirements should be paid attention to in the process of quenching steel: it is an important condition for cutting and quenching steel. It is necessary to have reasonable geometrical parameters of the tool to effectively perform the cutting performance of the tool material. According to the physical and mechanical properties of tool material and workpiece material, the workpiece shape, the rigidity of the process system and the machining allowance are used to select the reasonable cutting amount.


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May 02, 2018

The price of cemented carbide raw materials continues to rise

Cemented carbide raw material prices have been rising in 2017, caused the carbide product production enterprise production costs have risen sharply, the annual carbide product price rose, cemented carbide production enterprises generally face income drops, even without the embarrassing situation. At present, hard alloy production enterprises have been unable to bear the soaring cost of raw materials. At the end of the year, many hard alloy manufacturers are forced to have no choice but to raise the price of products.

 

In the price of raw materials, tungsten and cobalt rose the most

 

Tungsten carbide powder, the main raw material of cemented carbide, has risen from about 180 yuan/kg at the beginning of the year to about 269 yuan/kg at the end of this year, and the price has soared more than 50% in the whole year. Tungsten powder is also at the beginning of the year from 2017 181 yuan/kg all the way up, early September when the highest even up to nearly 300 yuan/kg, regeneration of the price of tungsten carbide powder is from the beginning of the end of 158 yuan/kg has been up to now 208 yuan/kg, rose by nearly 35%.

 

Tungsten, another major material for cemented carbide, has also risen sharply. The price of cobalt almost doubled in 2017, according to metal bulletin, trading at around $29 a pound. According to ubs, cobalt was the best base metal in 2017.

 

Of course, there are many reasons for the price increase, and the increase of raw material costs is only one of the reasons. The increase in operating costs and labor costs is also an important reason for the increase. In recent years, with the upgrading of the consumer market, the demand for high quality products has increased, while high-quality products are often accompanied by high costs, and the price increases will naturally follow.

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