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.

Related link:

http://www.wococarbide.com/Library/libraryinfo/id/442

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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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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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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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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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