The balance and installation of Grinding Wheel

Unbalanced grinding wheel in the high-speed rotation will produce vibration, affecting the quality of processing and machine tool accuracy, serious will cause the wheel fracture, endangering the safety of people and equipment. The main reason for the imbalance caused by uneven density of all parts of the wheel, geometric asymmetry and installation eccentricity and so on.

Therefore, the grinding wheel must be balanced before installation. There are two kinds of static and dynamic balance: - Static balance only; In the high-speed grinding and high-precision grinding, it must be balanced. For large-diameter grinding wheel, after the use of a period of time, due to grinding wheel wear, there may be unbalanced, need to balance again.

First, the use of super-hard abrasive features

The use of super-hard abrasive (diamond or cubic boron nitride) as a cutting tool abrasive, known as super-abrasive abrasive (referred to as super-hard abrasive). As the superhard abrasives have a great advantage over ordinary abrasives, superhard abrasives show more excellent grinding performance than ordinary abrasives, and have been widely used.

1, superhard abrasive itself has a very high hardness, can process a variety of high hardness materials, especially for ordinary abrasive material is more difficult to process its superiority;

2, Superhard abrasive wear less, the use of long cycle, high grinding ratio, get better economy, the use of shape to maintain good, no need to regularly change the grinding wheel and dressing wheel, saving working hours, improve working conditions, Is conducive to processing operations;

3, super-hard abrasive cutting sharp, grinding force is small, is conducive to processing parts machining accuracy and surface roughness to improve and reduce the power consumption of machine tools; abrasive abrasive sharp grinding grinding in the process of grinding temperature than ordinary Low, can greatly improve the quality of the surface to be processed to reduce or avoid parts of the cracks, burns, microstructure and other shortcomings, thereby improving the service life of parts, greatly improving the overall economic indicators.

In view of superhard grinding with unparalleled advantages, with the new materials, new technologies continue to emerge, with the processing industry, technological progress, its application continues to expand, the amount of growing, effectively promoting economic development. However, due to the high cost of tools, and its own unique performance and regularity, improper use will not only cause serious waste, but also not satisfied with the quality of processing and should get good economic results.


Second, first, to select the appropriate characteristics of superhard abrasive
Superhard abrasive is a different abrasive and ordinary abrasive, its structure and personality are not the same, has its unique characteristics. Superhard abrasive is characterized by abrasive, particle size, binder, concentration, shape and size items.

Dressing skills
The sharpening process is a sharpening process that grinds the abrasive grains of a superhard abrasive wheel. In this process, the need to remove the abrasive between the binder and abrasive wheel abrasive, grinding with a strong performance of the abrasive wheel prominent bonding agent, the formation of sharp cutting edge. Sharp must also remove small material from the pores of the grinding wheel surface to prevent the grinding force on the wheel from increasing and the grinding force on the grinding wheel to increase, which will cause vibration and surface burn. Without proper sharpening, even the best wheels can not achieve the high quality and dimensional uniformity of machined parts. In fact, when you invest in high-quality grinding wheel, in order to obtain high grinding performance, it is very good dressing it is very important. Shaping can be said to be part of the wheel preparation work, it is with the ordinary grinding wheel repair at the same time. For the superhard abrasive wheel, two processes are carried out separately, the first wheel to shape. In the use of superabrasive grinding wheel grinding, shaping is the use of plastic tools or rollers, repair sharp often use a ceramic bonding agent of the dressing rod, after the completion of shaping, grinding wheel for sharpening treatment. In this case,
It is important to ensure that the spindle bearings are at a certain temperature (such as a normal grinding wheel condition) before the grinding wheel can be trimmed and trimmed. This avoids damage to the part geometry and non-normal wear of the grinding wheel and dressing tool. Care must be taken with dressing tools because they are generally made of hard, abrasion-resistant but brittle diamond material and are very sensitive to minor cracks and crushing due to minor impact, stress.
Take minor trim
In order to reduce the dressing time, as if there is always want to choose a larger repair depth of the temptation. This is a very wrong idea. You must choose the most appropriate repair depth of the wheel dressing. Choose too much repair depth, will have a high cutting temperature, reducing the life of the dresser, but also useful to remove the wheel layer. The end result is that both the dresser and the grinding wheel are damaged, which is counterproductive. The best dressing quantity is the rule that can restore the grinding wheel geometry and produce good grinding edge after repairing several times. With a single-point dressing tool, the diametral direction of the grinding wheel should be contacted with a 10-15 ° axis of inclination. This will allow the single-point dressing tool to produce a sharpened effect when rotated periodically. The trimming tool with multi-point contact does not need to be tilted at this angle. With the entire end face of the dressing tool being in contact with the surface of the grinding wheel. In this case,
The traverse speed is the speed at which the dressing tool passes through the surface of the grinding wheel during dressing. It requires the processing of surface roughness and metal cutting rate are played a key role. Lateral movement too slow will clog the wheel and damage the part's surface roughness and metal-cutting rate. Too slow the traverse speed can also cause the grinding wheel to vibrate and burn the part surface. Even faster horizontal movement speed can repair a good grinding wheel surface to improve the grinding performance of grinding wheel to increase the grinding efficiency and reduce part surface roughness.

Grinding wheel application method - stone grinding

Grinding wheel is an important tool, which consists of many small and hard abrasive and bonding agent made of porous objects. Abrasive grains directly bear the cutting work, must be sharp and has a high hardness, heat resistance and a certain degree of toughness. Commonly used abrasives are alumina (also known as corundum) and silicon carbide two. Alumina abrasive high hardness, good toughness, suitable for grinding steel materials. Silicon carbide abrasive hardness higher, more sharp, good thermal conductivity, but more brittle, suitable for grinding of cast iron and carbide.
The same grinding wheel, because of its different thickness, the workpiece after processing the surface roughness and processing efficiency is not the same, abrasive coarse for coarse grinding, grinding fine for fine grinding, abrasive more coarse, smaller particle size. Qingxian Wang Weitun the first wheel factory is Qingxian well-known wheel manufacturer, the production of grinding wheel, wheel, new and old customers get the praise!
The binder acts as a bond abrasive. Commonly used are ceramic binders, followed by resin binders. Binding agent different choice of materials, affecting the grinding wheel corrosion resistance, strength, heat resistance and toughness.

The more firmly bonded, the more difficult to fall from the wheel, called the hardness of the wheel, that is, the hardness of the grinding wheel is the surface of the abrasive wheel under the action of the external force of the degree of difficulty falling. Easy to fall off called soft, otherwise called hard. The hardness of the grinding wheel and abrasive hardness are two different concepts. The surface of the workpiece to be ground is soft and the edge of the abrasive grain is not easy to wear, so that the abrasive grain can be used for a longer time, that is to say, an abrasive wheel with stronger hardness can be used. Conversely, the low hardness of the grinding wheel for grinding high hardness of the workpiece.
In order to ensure the safety, the wheel should be checked before installation, there should be no cracks and other defects; in order to make the wheel smooth, should be used before the dynamic balance test.
Grinding wheel work after a certain time, the surface of the gap will be debris clogging, abrasive sharp angle will be blunt, the original geometry distortion. It must therefore be trimmed to restore the cutting capacity and correct geometry. The wheel needs to be trimmed with a diamond pen.

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Grinding wheel grinding conditions

1. Grinding wheel margin is too large.

2. Reasonable grinding wheel parameter setting, reasonable choice grinding wheel grinding amount. In the grinding wheel burn occurs when less, should increase the longitudinal feed rate: grinding wheel burn occurs when a large amount of feed should be reduced to increase the number of grinding wheel.

3 workpiece speed reasonable setting, too high or too low is not very good.

4. Magnetic force is not enough, the workpiece stops adjusting the magnetic force.

5. Grinding spindle spindle vibration overhaul.

6. Strictly control the grinding wheel drive system and the gap between the grinding wheel mandrel, grinding wheel belt elastic adjustment appropriate.

7. Workpiece and grinding wheel motor torque selection is sufficient.

Users need to improve product quality awareness, the courage to improve manufacturing technology


The 21st century is a high-tech era, the product must be a high-performance, high-quality only the market, enterprises have vitality. To this end, the manufacturing technology should be improved as soon as possible, and the promotion of the use of CBN tools to improve manufacturing technology is a powerful measure, which not only requires the competent authorities of the strong support and support, organized and planned to gradually promote the CBN tools, Use, but also requires the user the courage to accept new materials, new technologies, changing the old concept of production and management methods, that knife (grinding) with a very low cost targets, only about 1/100 of the cost of the product, rather than In order to improve production efficiency and ensure product quality prevail, this will limit the quality and efficiency of the knife (grinding) with the application of advanced equipment and production capacity. Practice has proved that CBN knife (grinding) with the effectiveness of not only can improve the quality of the product processing, but also can improve economic efficiency.

Grinding wheel balance bracket is a must be equipped with accessories, it can be static balance wheel, in order to achieve the correct use of the purpose of grinding wheel, plus level instrument can also detect the static balance of precision parts.
Wheel balance bracket selection of high-quality materials for the balance axis, the heat treatment and precision machining and assembly Guer high precision, stable performance is an ideal machine tool accessories. General diameter greater than 125mm of the wheel to be balanced, so that the wheel center of gravity coincides with its rotation axis. Unbalanced grinding wheel in the high-speed rotation will produce vibration, affecting the processing quality and precision machine tools, serious damage will cause machine and grinding wheel disruption caused by uneven primary uneven grinding wheel parts density, geometric asymmetry As well as eccentric installation. Therefore, before installing the wheel to be balanced, the balance of static and dynamic balance wheel balance of two. Under normal circumstances, only for static balance, but in high-speed grinding (speed greater than 50m / s) and high-speed grinding, the need for dynamic balance. Balance wheel will be installed in the balance of the spindle, and then put the mandrel of the grinding wheel flat balance wheel on the balance of the guide rail, the wheel will swing back and forth until the swing stop. Balanced grinding wheel can be stationary at any position. If the wheel is unbalanced, its heavier parts always go to below, where the balance can be moved to balance.