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You know the size of abrasive grinding disc tools.

Abrasives are not only widely used in mechanical manufacturing and other metal processing industries, but also used in grain processing, paper industry and ceramics, etc. It is more widely used, so we should pay attention to its particle size after the meeting in this respect, today to understand this aspect.

Grain size refers to the size of abrasive particles, and the size is represented by grain size. The national standard specifies two sizes of abrasive and micro powder.

Particle size refers to the size of abrasive particles. Granularity is divided into two categories: abrasive and micro powder. For abrasive particles with large particle size and large cylindrical grinding wheel at 40 m, they are called abrasive particles. The size number is expressed by the number of holes in each inch of the screen passing through the grit. The size of the 60 abrasive grain indicates that the size of it can pass through 60 mesh holes per inch. For abrasive particles with a particle size less than 40 m, they are called fine powders. Grading by microscopic measurement, the size number is expressed by W and the number after W, and the value after W represents the actual size of fine powder. For example, W20 indicates that the actual size of the powder is 20 m.

In short, from the above content can be seen, abrasives in use to pay attention to the corresponding problems, each particle size is different, so in this respect at the same time pay attention to the corresponding information, so that you can choose according to your own situation.

Are you looking for 4 inches China grinding disc factory or China grinding disc manufacturer? We are the manufacturers you are looking for.

When grinding wheels, the axis of the fast 9'' grinding wheel and the axis of the workpiece should be raised. The error of equal height can be judged according to the grinding pattern. The convex pattern on the surface of the grinded ball indicates that the second half of the grinding wheel takes part in grinding. At this time, the center position of the grinding wheel should be adjusted so that it is equal to the center of the workpiece until the surface of the grinded ball is cross-meshed.

The error of grinding wheel made in China when grinding external spherical surface is within 0.003-0.004mm. The grinding wheel rack must be rotated at a certain angle. The dressing of the inner hole size of the grinding wheel should be completed before the machine tool is adjusted. When the grinding wheel is blunt in the grinding process, there is no need to trim the inner hole, but only the end face of the grinding wheel can be trimmed with a grinding bar.

Because of the severe friction, the temperature of the grinding area is very high. This will cause stress and deformation of the workpiece and even burn the surface of the workpiece. Therefore, a large amount of coolant should be injected to reduce the grinding temperature. Coolant also acts as chip removal and lubrication.

The grinding force increases with the bluntness of the abrasive particles, resulting in the breakage or shedding of the abrasive particles and the re-exposure of the sharp edge. This characteristic is called self-sharpening. Self-sharpening makes grinding work normally within a certain period of time, but after a certain working time, it should be manually trimmed to avoid vibration, noise and damage to the surface quality of the workpiece caused by the increase of grinding force.

Choosing reasonable grinding parameters

Taking the UWIE21 2 CNC tool grinder (15kW) of SAACKE Corporation of Germany as an example, the linear velocity of diamond China long life grinding wheel in grooving process (grooving) is 14~20m/s, the axial feed speed is 50~200mm/min, the radial feed is 210~510mm, and the fine grinding is 0.2 mm.

The linear speed of diamond long life grinding wheel is 14-24 m/s, the axial feed speed of machine tool is 100-400 m/min, the radial feed of machine tool is 0.3-1.0 mm, and the precision grinding is 0.05-0.1 mm. When grinding the front and rear surfaces, no feed return light grinding is used to improve the surface roughness. If imported grinding wheels are selected, it is allowed to choose higher linear speed and larger radial feed than domestic grinding wheel for stainless steels.

Now, I shares the importance of cooling diamond wheels.

The progress of industrialization has promoted the development of the times. More and more high-tech products emerge as the times require. In the hardware industry, dressing pens are gradually replaced by diamond dressing wheels. Our company is developing better and better in this series of diamond grinding wheels. Work is very important. It is also important to protect diamond wheels and grinding wheels and prolong their life.

Coolant nozzle is one of the most important designs in the manufacture of difficult and complicated workpieces. If coolant leaves the nozzle and does not reach the contact point directly, it will be released during the operation of diamond grinding wheels.

There is an inestimable serious consequence, so we should try to keep the coolant close to the circumferential speed of the high quality metal grinding disc and the contact point of the regenerative cooling. In the dressing line, the coolant nozzle must be installed because it is relatively important for the liquid between the contact points, between the grinding wheel and the wheel, in the direction of wheel rotation. Controlled cooling nozzle is a very important link in the optimization design of cooling nozzle, otherwise it will have incalculable benefits.

Above introduced the diamond fast cheap metal grinding disc in the production process of cooling link is also very important, so the installation of cooling system is also related to the life of diamond grinding wheel and operator safety issues, today we first briefly said, there will be more and more knowledge and technical operation of diamond grinding wheel slowly announced. I want to tell you all, and I hope you can keep an eye on us at any time!

If you are looking for China cheap grinding disc price, I believe we will satisfy you.

Grinding wheel is a kind of abrasive grinding disc tools with a large amount of usage and scope, so we are more concerned about its life, in addition to normal wear, there are other reasons leading to this phenomenon, to understand these factors, can also extend the service life.

The grinding wheel is made of abrasive and binder. Because the friction between the grinding wheel and the grinded workpiece produces a great deal of heat, the binder is easy to be softened.

The depressed grinding disc for metal is a bit blunt after a long time of hard work, which is mainly due to the friction between the surface particles and the tool, will gradually wear blunt, when the grinding resistance exceeds the bonding force between the particles and binder, the particles began to fall off, and was replaced by new sharp particles.

The grinding metal material and the binding agent are adhered to the gap between the sand grains, and the wheels are solid. If this kind of stopper grinding wheel continues to work, not only the work efficiency is quite low, the China abrasive tools for metal will become blue and cause annealing.

On the other hand, if the binder can not bond the particles firmly, grinding between the particles has not become pure will make them fall off, so that the sand transmission line wear fast, easy to deformation, need to be regularly trimmed.

These four conditions are the key to the life of the grinding wheel, which should be paid special attention to in daily use.

Do you know the density of abrasive wheels?

Abrasive concentration is different when grinding wheel production, different concentration of the finished product characteristics are different, China grinding wheel suppliers today take you to understand the concentration of grinding wheel, I hope it will be helpful to you.

Abrasive concentration is defined in powder compacted sintered or resin bonded grinding wheel sheets as containing 4.4 carats per cubic centimeter of volume. The thickness of the thin fast working grinding wheel is generally between 75-150.

Diamond grinding wheels use 50% - 100% concentration; most of them use 75%, which requires a higher smoothness can be lower than 75%. Forming grinding and longer service life requirements of the grinding wheel, can be used 100% or more;

The concentration of 25% - 150% is used in diamond products, of which the coarse-grained cutting saw blade and the concentration are generally lower, i.e. 25-50%, and the fine-grained one is higher; while the concentration of other metal bond grinding wheels is generally required to be 50% - 100%. Generally speaking, the concentration of coarse grinding is higher, that of semi-fine grinding is medium, and that of fine grinding and polishing is higher.

The China long life grinding wheel density is too low, cutting efficiency is not high, concentration is too high, grinding wheel strength is poor and grinding wheel consumption is large. So in production, we should pay attention to the concentration of the control, to ensure the quality of the grinding wheel.

Deformation of resin cutting abrasive wheels

The deformation of resin grinding wheel is a difficult problem that has puzzled the China grinding wheel suppliers of resin China long life grinding wheel for a long time. The root cause of deformation is the uneven microstructure in the effective area of the wheel, which leads to the uneven stress in the hardening process of the product.

Manufacturers of resin-bonded China long life grinding wheels should concentrate on solving the problems of mixture uniformity, molding uniformity and mesh stability. Only by gradually solving the above three problems can the deformation of resin-bonded grinding wheels (mainly cutting wheels) be solved.

Application field of grinding wheel

In general, peeling grinding is mainly applied in the following two areas:

(1) Replacing the traditional shaping cut-in grinding: CBN grinding wheels do not need to change grinding wheels and dressing tools frequently when processing different workpieces, which reduces grinding settings and adjustment time and improves processing flexibility; at the same time, the contact area between the fast working grinding wheel and the workpiece is smaller when peeling grinding (Fig. 3), so the required grinding force is also greater. Small, avoid grinding vibration and workpiece deformation due to excessive grinding force, and improve machining accuracy.

(2) Substitute for hard turning or as the follow-up process of hard turning: The use of CBN wheels for peeling grinding can improve the dimensional accuracy and surface processing quality of the workpiece.

The key factors that can maximize the grinding performance of grinding wheels are good dressing and sharpening tools and skilled dressing skills. An operator with high quality dressing tools and skilled dressing skills can always maintain a high grinding performance of grinding wheels. This is very important, because the workshop can not be equipped with special depressed grinding discs in stock according to everyone's operation.

Trimming is a sharp process for grinding abrasive grains of super hard abrasive wheels. In this process, it is necessary to remove the bond between the grinding grains and the blunt grinding grains, so that the grinding grains with strong grinding performance can stand out from the bond and form a sharp cutting edge. Trimming must also remove tiny materials from the pores on the surface of the 4.5 inches grinding disc to prevent the increase of grinding force acting on the grinding wheel and the increase of grinding force on the grinding wheel, which will cause vibration and cause burns on the surface of the parts.

Without proper sharpening, even the best grinding wheels are unlikely to achieve high quality and dimensional consistency of machined parts. In fact, when you invest in high quality grinding wheels, it is important to dress them well in order to achieve high grinding performance.

Plastic can be said to be part of the depressed grinding disc in stock reparation work, and it is also carried out at the same time with the ordinary grinding wheel. For super hard abrasive wheels, the two process is carried out separately, first of all, the 4.5 inches grinding wheel is reshaped. In grinding with super-hard abrasive wheels, shaping is carried out by using shaping tools or rollers. Shaping is often done by using a dressing rod with a ceramic bond. After shaping, the 4.5 inches grinding disc is sharpened.

Before grinding wheels include shaping and sharpening, it is important to ensure that the spindle bearings are in a certain temperature, such as the normal grinding condition of the grinding wheel. This avoids damage to the geometry of parts and the abnormal wear of grinding wheels and dressing tools. Tools used for dressing must be handled with care, as they are generally made of hard, wear-resistant but brittle diamond materials and are very sensitive to small cracks and breakages caused by minor collisions and stresses.

Because diamond shaper itself is a tool, it needs to be very sharp. Using a blunt finishing tool to repair the surface of the depressed grinding disc in stock will make the wheel blunt. In order to maintain a high quality and sharp diamond dressing tool, it is necessary to rotate a single point or tapered dressing tool in 1/8 circles at regular intervals. The number of rotations can be determined according to the dressing condition. According to experience, rotation is made at least once a day. For chisel heads and moulded dressing tools, they must be rotated 180 times before they are blunt.

Most cylindrical grinders place parts and grinding wheels on a horizontal line. The highest point of the outer circle of the part and the highest point of the outer circle of the grinding wheel is called the contact point of the part/grinding wheel. The diamond dressing tool should dress the grinding wheel as close as possible to the contact point of the part/grinding wheel. For 4.5 inches grinding wheels used in internal grinding machines, it is more important to dress the diamond dressing tool near the highest point of the outer circle of the grinding wheel.

Abrasive grinding disc tools is one of the most important methods in machining. It is the most basic and preferred method in precision machining and ultra-precision machining. It has been widely used in industry. Resin abrasive tools are an important part of abrasive tools, and one of the important grinding tools in industrial production and application. In order to promote technical exchange, this article mainly introduces common problems in resin high-quality metal grinding disc manufacturing.

Cause analysis of unstable quality of resin wheel

Many quality problems will occur in the production process of resin depressed grinding disc for metal. Because resin grinding wheel manufacturing belongs to the multi-disciplinary synthesis of composite materials, the causes are complicated.

Raw material problem

Resin grinding wheel is a complex system composed of a variety of main and auxiliary raw materials. As long as the material is abrasive and binder, the auxiliary materials include the filler, reinforcing material, coloring agent and so on.

For more information about China abrasive tools for metal and China grinding disc manufacturer, visit the website.

Cylindrical grinder is very common in mold factory and hardware processing factory, and has become a common equipment for mechanical industry technicians. In the operation of cylindrical grinder, the choice of abrasive is very important.

1. Selection of abrasive for cylindrical grinder

Corundum fast 9'' grinding wheels are used for hardened or non-hardened steel rolls, while silicon carbide grinding wheels are used for chilled cast iron rolls, rubber rolls, copper rolls and granite rolls. Corresponding corundum grinding wheels should be selected for different steel rolls to obtain higher grinding accuracy and surface quality. For example, chromium corundum (PA) grinding wheel is used for alloy steel rolls, zirconium corundum (ZA)  230*6*22mm grinding wheel for stainless steel is used for heat-resistant alloy steel rolls, and single crystal corundum (SA) is used for stainless steel rolls.

2. Selection of grinding wheel made in China size for cylindrical grinder

Coarse grinding (24-60) grinding wheels are selected for coarse grinding, fine grinding (60-100) grinding wheels for fine grinding, 150 grinding wheels for precision grinding, and fine grinding (W63-W14) wheels are generally used for super-precision grinding or mirror grinding.

3. grinding wheel hardness selection of cylindrical grinder

The harder the grinding roller is, the softer the hardness of the 230*6*22mm grinding wheel for stainless steel should be.

(1) If the 230*6*22mm grinding wheel for stainless steel wears out too fast, it indicates that the grinding wheel selected for the rolls of a particular processing is too soft, the following improvement measures can be taken:

A. increase the linear speed of the grinding wheel made in China.

B. Increase the longitudinal feed rate of the trailer, that is, the longitudinal feed of the workpiece per turning Trailer increases to 2/3~3/4 of the width of the fast 9'' grinding wheel.

C. reduces roll speed.

If the above measures are not taken, the obvious grinding effect has not been achieved, indicating that the grinding wheel is too soft and not applicable, and a harder grinding wheel should be selected.

(2) if grinding wheel is obviously obstructed (Chi Li) or dirty, the passivation sand is not easy to fall off, the wheel is easy to adhere to the grinding debris, and the surface of the roller is burnt and scuffed.

A. reduces wheel speed;

B. increase roller speed.

If the above measures have not yet achieved obvious grinding effect, indicating that the grinding wheel is too hard, should choose a bit softer grinding wheel.

4. Selection of grinding wheel binder for cylindrical grinder

Besides resin bonded grinding wheels, ceramic fast 9'' grinding wheels are preferred for roller surface grinding.

Grinding cracks on the surface of integral cemented carbide tools are mainly caused by the shallow compressive stress distribution in the grinding surface layer and the excessive tensile stress value in the near surface layer which exceeds the breaking strength of the material due to the excessive local instantaneous temperature in the grinding contact zone during the grinding process. Therefore, the instantaneous stress should be minimized and avoided as far as possible in the grinding process. The generation of high temperature also reduces and avoids the existence of residual tensile stress.

The instantaneous high temperature in the grinding process often causes the change of the mechanical properties of the grinding surface layer. This instantaneous high temperature can reach more than 1000 degrees Celsius, causing grinding burn to the tool surface layer. Grinding burn will destroy the surface layer structure of the tool, deteriorate the quality of the workpiece surface, seriously affect the strength, wear resistance and service life of the tool; serious cracks will also occur. Therefore, not only to prevent grinding cracks, but also to avoid grinding burn. In diamond machining, the local instantaneous temperature of the tool surface will depend on the machining method, the characteristics of the diamond tool and the grinding system.

Practice has proved that the higher the linear velocity and radial feed rate of diamond grinding wheel, the higher the hardness of fast cheap metal grinding disc, the finer the grain size of fast cheap metal grinding disc, the lower the thermal conductivity of cutting tool material and the worse the 180*6*22mm metal grinding disc wear, the higher the grinding temperature, the easier the grinding cracks and burns will occur.

To control and avoid grinding cracks and grinding burns, two measures must be taken: one is to reduce the generation of grinding heat, and the other is to accelerate the transmission of grinding heat. The ways to reduce grinding heat are to reduce the linear velocity of the diamond grinding wheel, reduce the radial feed (roughing-finishing-polishing), select the softer diamond grinding wheel, reduce the contact area between the workpiece and the 180*6*22mm metal grinding disc, reasonably select the high quality metal grinding disc size according to the grinding requirements, and often keep the fast cheap metal grinding disc in sharp conditions.

Sharpening and selecting suitable grinding coolant to reduce friction between abrasive particles and workpiece. The measure to speed up the grinding heat release is to adopt effective cooling methods besides the proper speed and axial feed rate. In order to improve the cooling effect, spray cooling, high pressure cooling, internal cooling and low viscosity oil are adopted. In addition, in the fine grinding process, reducing the feed and proper grinding can effectively reduce the residual stress in the surface.

In summary, in order to improve productivity and grinding efficiency, and at the same time to obtain better grinding surface quality, our method is to start with a lower wheel linear speed and larger radial feed, the last few feeds reduced and the wheel linear speed increased, and polishing, which can improve the grinding surface quality. In order to further improve the surface quality of grinding, spray cooling and high pressure cooling can be used to select suitable cutting fluid, and the fast cheap metal grinding disc and 180*6*22mm metal grinding disc are selected according to the processing objects.

The selection principle of grinding parameters is: the grinding parameters are to ensure that the grinding temperature is low, grinding surface roughness is high, as far as possible to select a lower wheel linear speed, larger radial feed, axial feed and workpiece speed. Because the linear speed and radial feed rate of high quality metal grinding disc have the greatest influence on the quality of grinding surface layer, the selection of grinding parameters is as follows: first select the larger workpiece speed, then choose the axial feed, and finally choose the linear speed and radial feed rate of fast cheap metal grinding disc.

1,Installation, balance and dressing technology of China grinding abrasive disc on grinder

Special attention should be paid to the installation of China high efficient grinding discs on grinding machines. Because the wheel is working at high speed, it should be carefully checked before use and no cracks are allowed. The installation must be reliable and should be adjusted through static balance so as to avoid adult and quality accidents.

The inner hole of the grinding wheel and the outer circle of the wheel shaft or flange can not be too tight. Otherwise, the grinding wheel will expand and crack easily when grinding. Otherwise, the grinding wheel will be prone to eccentricity, lose balance and cause vibration. The general fit clearance is 0.1~0.8mm, and the clearance of the high speed grinding wheel is smaller. When grinding wheels are clamped with flanges, the diameters of the two flanges shall be equal, and the outer diameters shall not be less than 1/3 of the outer diameters of the grinding wheels.

Thick cardboard or oil-resistant rubber is used as the backing between the flange plate and the end face of the China high efficient grinding disc to make the pressure evenly distributed and the tightening force of the nut can not be too large, otherwise the grinding wheel will break. Pay attention to the direction of the fastening thread, should be opposite to the direction of the grinding wheel, that is, when the grinding wheel rotates counter-clockwise, with the right-hand thread, so that the grinding wheel in the grinding force, will drive the nut more tightly.

2.China grinding abrasive discs with diameters greater than 125 mm should be balanced so that the center of gravity of the wheel coincides with its axis of rotation.

The unbalanced grinding wheel will produce vibration when it rotates at high speed, the quality of color sound processing and the precision of machine tool, and will cause machine damage and grinding wheel fragmentation when it is serious. Therefore, the balance must be balanced before installing the high efficient metal abrasive disc. The balance of the grinding wheel has two kinds: static balance and dynamic balance. In this case, only static balancing is required, but dynamic balancing is required in high-speed mushroom grinding (speed greater than 50m/s) and high-profile grinding.

The static balancing device of the grinding wheel. Stop it. The balancing wheel can be stationary at any position. If the grinding wheel is unbalanced, the heavier part of the wheel always goes below. The balance block can be moved to balance. Cracks must be checked before the balanced grinding wheel is installed on the main shaft of the machine tool. Cracks in the grinding wheel are absolutely forbidden to use. Set the clearance to prevent the expansion of the spindle from expanding.

The method of balancing grinding wheel is to install several balancing blocks in the annular groove of the flange of the grinding wheel and make the center of gravity of the grinding wheel coincide with its rotating axis by adjusting the position of the balancing blocks.

3. Under the action of friction and extrusion, the edges and corners of the China high efficient grinding discs become blunt gradually, or when grinding tough materials, the debris is often embedded in the pores on the surface of the grinding wheels, so that the surface of the grinding wheels is blocked, and finally the cutting ability of the grinding wheels is lost. At this time, there will be a slippage between the grinding wheel and the workpiece, and may cause vibration and noise, so that the grinding efficiency will be reduced, the surface roughness will become worse. At the same time, because of the increase of grinding force and grinding heat, workpiece deformation and grinding accuracy will be affected, serious grinding surface will appear burns and small cracks.

In addition, because of the uneven hardness of the grinding wheel and the different working conditions of the abrasive, the abrasive wear on the working surface of the grinding wheel is uneven, and the number of abrasive particles in different parts is different, resulting in the loss of the shape accuracy of the grinding wheel, affecting the shape accuracy and roughness of the workpiece surface. Wheels must be trimmed to remove a layer of abrasive, so that the surface of the grinding wheel is exposed again to smooth sharp abrasive grains, in order to restore the cutting ability and profile accuracy of the high efficient metal abrasive disc.