May 14, 2021 in Travels
In our daily life, we can’t see TCT circular saw blades, but in many factories, we can see TCT circular saw blades and many other saw blades. Today we will take a look at the number of teeth of the sawtooth
Generally speaking, the more the number of teeth, the more cutting edges in a unit time, the better the cutting performance. However, the more cutting teeth, the more cemented carbide is needed, and the price of the saw blade is higher, but the teeth are too dense. The reduction of the chip volume between the teeth will easily cause the saw blade to heat up; in addition, if there are too many teeth, if the feed is not properly matched, the cutting amount of each tooth will be small, which will intensify the friction between the cutting edge and the workpiece and affect the service life of the cutting edge. Usually, the tooth spacing is 15-25mm, and a reasonable number of teeth should be selected according to the material to be sawed.
The number of teeth of the saw blade is determined by the diameter of the saw blade, the thickness of the workpiece, and the material. Generally speaking, the saw blade used to cut thinner workpieces has more teeth and a smaller tooth chamber.
The extra long wood drill bit can’t be increased in length casually, so you need to learn more about it before modifying it.
April 30, 2021 in Travels
In our surroundings or in our lives, we often see all kinds of cutting tools or cutting tools wholesale . Because there are still many uses of cutting tools. After using for a long time, the cutting tools will wear out more or less, so will the cutting tools wear out during the processing?
During cutting, the hard points in the workpiece material or the built-up edge fragments adhered to the workpiece and chips will carve groove marks on the surface of the tool, causing the tool to wear. This is mainly caused by mechanical friction, also known as mechanical wear.
When cutting plastic materials, there is a relatively large pressure between the tool and the workpiece and the chips. At an appropriate temperature, bonding occurs between the tool and the chip, and the contact surface of the tool and the workpiece. Due to the cutting movement, after the bonding point is broken, the particles on the surface of the tool are taken away, causing the tool to wear.
Under higher temperature conditions (700~800℃), the surface material of the tool will oxidize with oxygen in the air to form a low-strength oxide film. The oxide film is easily wiped off by the workpiece or chips, causing tool wear.
So in the process of processing, there will be wear if you are not careful, and threading tools are the same.
April 16, 2021 in Travels
Diamond cup grinding wheel has different types and specifications to meet different application needs. It is commonly used to polish concrete, stone, paint, glue, epoxy, and other ground coatings.
Diamond cutter heads have different matrixes, different particle sizes, and different diamond concentrations; the matrix can be divided into hard, medium, and soft, etc.; the particle size can be divided into coarse, medium, and fine; so their quality and use are different.
When grinding cemented carbide, its grinding efficiency is several times that of silicon carbide. When grinding W12 Cr4V4Mo high-speed steel with poor grinding performance, the average efficiency is increased by more than 5 times. It can be seen that the grinding efficiency of the Diamond cup grinding wheel is still very high.
The Tungsten carbide hole saws , like the Diamond cup grinding wheel, have different specifications and carcasses, so you need to pay more attention when using them.
April 9, 2021 in Travels
The drill bit should be a very common tool, among which the drill bit we have heard the most is the wood auger drill bit . However, it is easy to buy a drill bit, and subsequent maintenance and maintenance are not easy. Among them, grinding the drill bit is also a technical task.
The sharpening quality of the drill bit affects the drilling accuracy and the working ability of the drill bit. If the symmetrical configuration of the drill bit edge (or guide center) relative to its axis slightly deviates, it will cause the deflection of the drill bit during the working process. Decrease drilling accuracy. The sharp angle of the cutting edge of the drill depends on the quality of sharpening, material properties, and the geometry of the cutting part of the drill.
The two cutting edges should have the same length; the inclination angles of the two cutting edges relative to the axis of rotation of the drill bit should be the same; the chisel edge of the drill bit should be in a straight line after sharpening, and its center should be consistent with the axis of rotation of the drill bit. The transverse drill bit needs to sharpen the guide center, sinker knife, and cutting edge separately. The main blade is sharpened from the back, the sinking knife is sharpened from the inside (round and toothed sinking knives can be sharpened by hand with a smooth file or a hand file, and then polished with oilstone), and the guide center is to sharpen the tapered surface, The correctly ground guide center should have a symmetrical configuration surface, and the cone center of the cone should be consistent with the drill bit axis.
In addition to the wood auger drill bit, the HSS cobalt drill bit , which is known for its hardness, is also a very popular product.
April 2, 2021 in Travels
Diamond grinding wheels are one of the hardest materials known, and there are two types: natural and man-made. The Diamond cup grinding wheel is made of the diamond as raw material.
Diamond is a mineral composed of pure carbon dioxide. Diamond is the hardest substance in nature. The use of diamonds is very wide, such as handicrafts, a cutting tool in the industry. Carbon can form diamonds at high temperatures and high pressure.
Diamond cup grinding wheel is one of the diamond tools. It is mainly suitable for the surface grinding of various refractory materials. The product adopts a specially designed tapered mounting hole structure, which is easy to install and unload, and has good processing flatness and grinding. The advantages of high cutting efficiency and long life can be applied to all domestic and imported grinding equipment.
When in the form of a single carbon compound, the hardness of tungsten carbide can compete with diamond, and it is the hardest material known. Because tungsten carbide has very good characteristics, it can be widely used. Tungsten carbide hole saws are one of the applications.
March 26, 2021 in Travels
A drill bit is a tool that rotates and has the cutting ability at the tip, so you will see one or two at home, especially wood auger drill bit . Many novices who are grinding drills for the first time, always feel that their drills are not standardized. So today we will talk about the correct posture for grinding the drill.
The cutting edge of the drill must swing up and down, and the tail of the drill must not be warped. This is a standard drill grinding action. The main cutting edge must swing up and down on the grinding wheel, that is, the hand holding the front of the drill must evenly swing the drill up and down on the grinding wheel. However, the hand holding the handle cannot swing, and the rear handle must not be tilted upwards, that is, the tail of the drill bit cannot be tilted higher than the horizontal centerline of the grinding wheel, otherwise the cutting edge will be blunt and unable to cut. This is the most critical step. The quality of the drill bit has a lot to do with it. When the sharpening is almost done, start from the edge of the blade and rub it lightly towards the back corner to make the back of the blade a bit smoother.
Regardless of whether it is an HSS cobalt drill bit or a wood auger drill bit, the posture during grinding is still very important. The quality of the drill bit is determined by this to a large extent, so it is still necessary to learn.
March 19, 2021 in Travels
As a common cutting tool, drill bits must be made of steel to achieve the required hardness. But unlike the stainless steel knives of general kitchen knives, common drill materials are nothing more than HSS cobalt drill bit , tungsten steel drill bits, etc., and there are often so-called “cobalt drill bits” on the market. What does this mean?
Cobalt-containing drill bits are made of cobalt-containing high-speed steel. Cobalt-containing high-speed steel belongs to the “high-hard or super-hard high-speed steel category”. The addition of “cobalt” to ordinary high-speed steel materials can increase the hardness of the tool to HRc 66 degrees, and increase the red hardness (hot hardness) of the tool, thereby increasing the cutting speed and service life of the tool.
Commonly used drills for processing stainless steel are high-cobalt drills (m35 drills, m42 drills), among which m42 drills are the most cost-effective. Cemented carbide drill bits can also be used, but the price is higher.
The above is some understanding of cobalt drill bits, like wood auger drill bit , most of them have high hardness.
March 12, 2021 in Travels
Tungsten carbide hole saws can cut very hard materials, including hardened steel, cast iron, bricks, etc. The shaft made of carbon steel is matched with a centering drill.
The theoretical carbon content of tungsten carbide is 6.128% (atomic 50%). When the carbon content of tungsten carbide is greater than the theoretical carbon content, free carbon (WC+C) appears in the tungsten carbide. The presence of free carbon will carbonize the surrounding area during sintering. The growth of tungsten grains results in uneven grains of cemented carbide; tungsten carbide generally requires high combined carbon (≥6.07%) free carbon (≤0.05%), and total carbon is determined by the production process and scope of use of cemented carbide.
The WC total carbon used in alloys with different application ranges, different cobalt contents, and different grain sizes can be adjusted slightly. Low-cobalt alloys can choose tungsten carbide with higher total carbon, and high-cobalt alloys can choose tungsten carbide with lower total carbon. In short, the specific requirements of cemented carbide have different requirements for the particle size of tungsten carbide.
Cemented carbide materials like tungsten carbide and diamond are usually made into cutting tools, Tungsten carbide hole saws, Diamond cup grinding wheel , etc.
March 5, 2021 in Travels
HSS cobalt drill bit is probably not too unfamiliar to everyone, for some people, it may still be very familiar. Since ancient times, there have been people who have survived by engaging in this industry.
High-speed steel, also known as wind steel or front steel, means that it can be hardened even if it is cooled in the air during quenching, and it is very sharp. It is complex alloy steel, containing carbide-forming elements such as tungsten, molybdenum, chromium, vanadium, and cobalt. The total amount of alloying elements is about 10-25%. It can maintain high hardness even when high heat is generated by high-speed cutting (about 500℃), and the HRC can be above 60. This is the most important characteristic of high-speed steel-red hardness.
After quenching and low-temperature tempering, carbon tool steel has high hardness at room temperature, but when the temperature is higher than 200℃, the hardness drops sharply, and the hardness at 500℃ has dropped to a similar degree to the annealed state. , Completely lost the ability to cut metal, which limits the use of carbon tool steel to make cutting tools. High-speed steel, because of its good red hardness, makes up for the fatal shortcomings of carbon tool steel and can be used to make cutting tools.
Therefore, the hardness of the HSS cobalt drill bit is slightly higher than that of the wood auger drill bit , and the places used are also different.
February 26, 2021 in Travels
For us, the wood auger drill bit is a tool that is too simple to be simpler, but when we observe its shape, we will find that there are complex layers and details under the simple appearance, so we are also polishing the stone. Need to pay attention to the issue of angle.
The correct drill sharpening should accurately maintain the angle values of the cutting elements and their mutual configuration. After sharpening, the end face of the cutting edge swings <0.08mm, and the allowable angle parameter deviation is ±2°. Burns, peeling, etc. are not allowed on the sharpened surface. The sharpening of the drill can be done with a grinding wheel or a hand file. When sharpening the drill bit on the grinder, choose a hard or medium-soft ordinary grinding wheel with a grain size of 46~60 and a grinding wheel speed of 25m/s. When sharpening, the drill bit can be placed in the special guide groove, the entire special fixture can be turned to a certain angle around the axis (rotate in two directions), and the flank surface can be sharpened according to the formed cone.
HSS cobalt drill bit also needs attention when polishing.