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Common problems and solutions for INA bearing units
Source: China Bearing Network Time: 2013-06-18
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Yes. If the INA bearing has foreign matter such as iron filings, burrs, dust, etc., it will cause noise and oscillation during the operation of the bearing; it will even damage the raceway and the rolling body. Therefore, before the bearing of the device, you need to ensure the device. Health of the exterior and installation environment.
Second, is it necessary to remove the bearing device?
INA bearing exterior is coated with anti-rust oil; you need to carefully clean it with hygienic gasoline or fire oil; then apply clean high-quality or high-speed high-temperature smooth grease to the device. The effect of hygienic degree on bearing life and oscillation noise is Very large. But we want to uniquely remind you that the fully enclosed bearings do not need to be cleaned.
Third, how to choose smooth grease?
Smoothness has a very important impact on the operation and life of INA bearings; here is a general guideline for the analysis of smooth greases. Smooth greases are made from base oils, thickeners and additives; different varieties and different varieties are not the same trademark. The smooth grease function varies greatly; the rotation limit is not the same; it is necessary to pay attention when selecting. The function of smooth grease is mainly determined by the base oil; usually the low viscosity base oil is suitable for low temperature and high speed; the high viscosity is suitable for high temperature. High load. Thickener is also related to the smooth function; the water resistance of the thickener determines the water resistance of the smooth grease. The standard; the smooth grease of different brands can not be mixed; and; even the smooth grease of the same thickener Will also have a bad influence on each other due to different additives.
Fourth, in smooth bearings; the more grease is coated, the better?
For smooth INA bearings; the more grease is applied, the better; this is a common fault concept. Excessive grease in the bearing and bearing chambers will form excessive mixing of grease; then extremely high temperatures occur. The amount of bearing filling smoothing agent is It is better to fill the inner space of the bearing 1/2 to 1/3; it should be reduced to 1/3 at high speed.
Five, how to install and disassemble?
Do not directly hammer the bearing end face and the non-stress surface when installing the device; the bearing should be evenly stressed by the clamp, sleeve or other device (tooling); do not pass the tumbler drive device. If the device is coated with smooth oil Will make the device smoother. If the cooperation is too big, the bearing should be placed in mineral oil and heated to 80~90 °C to hurry up; strictly control the oil temperature does not exceed 100 °C; to avoid the tempering effect hardness drop and influence Scale rehabilitation. When it is difficult to disassemble; it is recommended that you use the unpacking and pulling out together to pour hot oil onto the inner ring; the heat will make the inner ring of the bearing swell; then make it easier to fall.
Sixth, the smaller the radial clearance of the bearing, the better?
Not all INA bearings require the minimum working clearance; you need to choose the appropriate clearance according to the conditions. GB 4604-93; rolling bearing radial clearance is divided into five groups - 2 groups, 0 groups, 3 groups, 4 groups, 5 groups; the clearance value is from small to large; the 0 group is the standard clearance. The basic radial clearance group is suitable for common working conditions, conventional temperature and common interference cooperation, at high temperature and high speed. For bearings operating under special conditions such as low noise and low conflict, large radial clearance should be used. For radial spindles and bearings for machine tool spindles, smaller radial clearance should be used. For roller bearings, a small number of bearings can be adhered to. Work clearance. Others; there is no such thing as clearance for the bearing that is not disengaged, and finally; the working clearance after the bearing is installed; it is better than the original clearance before the device. Fortunately, the mother is still changing the INA bearing. The amount of elastic deformation that occurs in cooperation and load.
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