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Application fields and precautions of oil-free bearings
Author:admin Date:2022-03-11
The basic requirements of the bearing on the material depend to a large extent on the working performance of the bearing. Whether the material used to manufacture rolling bearings is suitable will have a great influence on its performance and life.
Precautions
1. The retainer and sealing plate of the oil-free bearing must not be forced. The installation method of using a hammer and a sleeve is a commonly used method, because it will damage the bearing, so do not hit it directly. Be sure to tap in with the sleeve in the middle as shown in the picture. The hammer should strike lightly. In the mechanical structure, when the inner and outer rings are tightly fitted, a backing plate should be used, so that the force can be applied to the inner and outer rings at the same time.
2. Whether there is dust or mold sand attached to the surface of the bearing shell.
3. In order to avoid bumps during installation, a small amount of lubricating oil should be applied to the surface of the shaft and shaft housing. When installing the bearing on the shaft, force must be applied to the inner ring, and when installing the bearing to the bearing housing, force must be applied to the outer ring. When applying force to the bearing, be careful to make the force go down vertically and evenly, otherwise the bearing will be injured. For this reason, try to avoid partial hits as much as possible.
4. It should be determined whether there are bumps, protrusions, etc. on the mating surface of the shaft center and the shaft shell.
5. The hardness of the bearing will be reduced due to overheating, so it must not exceed 100 degrees. At this time, the bearing must be suspended by steel wire, or placed on the wire rod, on the support plate, not on the bottom of the groove. When the bearing reaches the desired temperature (below 100 degrees), it should be taken out of the groove immediately and put into the shaft quickly. The bearing will shrink as the temperature drops, and sometimes there will be a gap between the shoulder and the end face of the bearing. Therefore, A tool is required to compress the bearing in the axial direction.
6. Although it is a small bump, protrusion, etc., if it is, it should be removed with oil grindstone or fine sandpaper.
If only the inner ring is press-fitted, the force will be forced into the outer ring through the balls, thus causing scratches on the raceway surface. When installing a bearing with a large margin on the shaft, the method of heating the bearing to 80-90 degrees in clean oil and expanding the inner diameter is widely used.
In general, the main failure forms of rolling bearings are fatigue spalling under alternating stress and loss of bearing accuracy due to friction and wear. In addition, there are also cracks, indentations, rust and other reasons that cause abnormal damage to the bearing.
Therefore, rolling bearings should have high resistance to plastic deformation, less friction and wear, good rotational accuracy, good dimensional accuracy and stability, and long contact fatigue life. And many of these properties are determined by the material and heat treatment process.
SF-2 plus boundary lubrication bearing
Acidic polyoxymethylene has high wear resistance. The bearing surface is regularly arranged with oil storage pit and must be filled with lubricating grease when assembling. It is especially suitable for high load and low speed rotating motion, rocking motion and frequent Under load, it is not easy to form fluid lubrication parts when opening and closing. Under boundary lubrication conditions, it can be used for a long time without oil maintenance, and oiling during the process can prolong the service life of the bearing. Currently, it is suitable for metallurgical machinery, mines Machinery, hydraulic machinery, auto parts, construction machinery, agricultural machinery, etc.
Oil-free self-lubricating bearings
The product is made of steel plate as the base, sintered spherical bronze powder in the middle layer, and a mixture of PTFE and lead rolled on the surface. It has the characteristics of small friction coefficient, wear resistance, corrosion resistance, oil-free self-lubrication and long service life. Using it can reduce costs, reduce noise, and prevent sticking and slipping. It is widely used in sliding parts of various machinery such as printing presses, textile machines, hydraulic trucks, tobacco machines, medicinal machinery, fitness equipment, micro-motors, automobiles, motorcycles, etc.
Metal base inlaid solid self-lubricating bearings
It is a novel lubricating bearing that combines the characteristics of metal bearings and self-lubricating bearings. The metal base bears the load, and the specially formulated solid lubricating material plays the role of lubricating. It has the characteristics of high bearing capacity, impact resistance, high temperature resistance and strong self-lubricating ability.
Due to the advantages of low noise and self-lubrication, traditional oil-impregnated bearings have become the new favorite of computer CPU fan bearings, and the market demand is large; Applications in household appliances are also expanding.
Precautions
1. The retainer and sealing plate of the oil-free bearing must not be forced. The installation method of using a hammer and a sleeve is a commonly used method, because it will damage the bearing, so do not hit it directly. Be sure to tap in with the sleeve in the middle as shown in the picture. The hammer should strike lightly. In the mechanical structure, when the inner and outer rings are tightly fitted, a backing plate should be used, so that the force can be applied to the inner and outer rings at the same time.
2. Whether there is dust or mold sand attached to the surface of the bearing shell.
3. In order to avoid bumps during installation, a small amount of lubricating oil should be applied to the surface of the shaft and shaft housing. When installing the bearing on the shaft, force must be applied to the inner ring, and when installing the bearing to the bearing housing, force must be applied to the outer ring. When applying force to the bearing, be careful to make the force go down vertically and evenly, otherwise the bearing will be injured. For this reason, try to avoid partial hits as much as possible.
4. It should be determined whether there are bumps, protrusions, etc. on the mating surface of the shaft center and the shaft shell.
5. The hardness of the bearing will be reduced due to overheating, so it must not exceed 100 degrees. At this time, the bearing must be suspended by steel wire, or placed on the wire rod, on the support plate, not on the bottom of the groove. When the bearing reaches the desired temperature (below 100 degrees), it should be taken out of the groove immediately and put into the shaft quickly. The bearing will shrink as the temperature drops, and sometimes there will be a gap between the shoulder and the end face of the bearing. Therefore, A tool is required to compress the bearing in the axial direction.
6. Although it is a small bump, protrusion, etc., if it is, it should be removed with oil grindstone or fine sandpaper.
If only the inner ring is press-fitted, the force will be forced into the outer ring through the balls, thus causing scratches on the raceway surface. When installing a bearing with a large margin on the shaft, the method of heating the bearing to 80-90 degrees in clean oil and expanding the inner diameter is widely used.
In general, the main failure forms of rolling bearings are fatigue spalling under alternating stress and loss of bearing accuracy due to friction and wear. In addition, there are also cracks, indentations, rust and other reasons that cause abnormal damage to the bearing.
Therefore, rolling bearings should have high resistance to plastic deformation, less friction and wear, good rotational accuracy, good dimensional accuracy and stability, and long contact fatigue life. And many of these properties are determined by the material and heat treatment process.
SF-2 plus boundary lubrication bearing
Acidic polyoxymethylene has high wear resistance. The bearing surface is regularly arranged with oil storage pit and must be filled with lubricating grease when assembling. It is especially suitable for high load and low speed rotating motion, rocking motion and frequent Under load, it is not easy to form fluid lubrication parts when opening and closing. Under boundary lubrication conditions, it can be used for a long time without oil maintenance, and oiling during the process can prolong the service life of the bearing. Currently, it is suitable for metallurgical machinery, mines Machinery, hydraulic machinery, auto parts, construction machinery, agricultural machinery, etc.
Oil-free self-lubricating bearings
The product is made of steel plate as the base, sintered spherical bronze powder in the middle layer, and a mixture of PTFE and lead rolled on the surface. It has the characteristics of small friction coefficient, wear resistance, corrosion resistance, oil-free self-lubrication and long service life. Using it can reduce costs, reduce noise, and prevent sticking and slipping. It is widely used in sliding parts of various machinery such as printing presses, textile machines, hydraulic trucks, tobacco machines, medicinal machinery, fitness equipment, micro-motors, automobiles, motorcycles, etc.
Metal base inlaid solid self-lubricating bearings
It is a novel lubricating bearing that combines the characteristics of metal bearings and self-lubricating bearings. The metal base bears the load, and the specially formulated solid lubricating material plays the role of lubricating. It has the characteristics of high bearing capacity, impact resistance, high temperature resistance and strong self-lubricating ability.
Due to the advantages of low noise and self-lubrication, traditional oil-impregnated bearings have become the new favorite of computer CPU fan bearings, and the market demand is large; Applications in household appliances are also expanding.
