Writer: Eric Bearing Limited
SKF imported bearings are widely used, and bearing installation, use, cleaning and maintenance are also very particular. Therefore, there will naturally be some problems in the use of SKF bearings. Today, Eric Bearing Limited will explain to everyone about the installation and maintenance of SKF imported bearings.
1. SKF bearing requirements for installation surface and installation place
If there are iron filings, burrs, dust and other foreign objects in the SKF bearing, it will cause the SKF bearing to produce noise and vibration during operation, and even damage the raceways and rolling elements. Therefore, before installing SKF bearings, you must ensure that the installation surface and the installation environment are clean.
2. SKF bearings must be cleaned before installation
The surface of SKF bearings is coated with anti-rust oil. You must clean it carefully with clean gasoline or kerosene, and then apply clean, high-quality or high-speed and high-temperature lubricating grease before installation. Cleanliness has a great influence on SKF bearing life and vibration and noise. But we want to remind you in particular: fully enclosed SKF bearings do not need to be cleaned and refueled.
Three, the choice of SKF bearing radial clearance
Not all SKF bearings require the smallest working clearance, you must select the appropriate clearance according to the conditions. In the national standard 4604-93, the radial clearance of rolling SKF bearings is divided into five groups-2 groups, 0 groups, 3 groups, 4 groups and 5 groups. The basic radial clearance group is suitable for general operating conditions, normal temperature and commonly used interference fit; SKF bearings that work under special conditions such as high temperature, high speed, low noise, low friction, etc. should choose large radial clearance; For precision spindles and machine tool spindles, SKF bearings should use smaller radial clearance; for roller SKF bearings, a small amount of working clearance can be maintained. SKF 29256 bearings online , pls click here :
Fourth, the installation and disassembly of SKF bearings
Do not directly hammer the end surface and non-stressed surface of SKF bearing during installation. Press blocks, sleeves or other installation tools should be used to make SKF bearings evenly stressed. Do not install through the transmission force of rolling elements. If the installation surface is coated with lubricating oil, the installation will be smoother. If the matching interference is large, the SKF bearing should be installed as soon as possible after being heated to 80~90℃ in mineral oil. The oil temperature should be strictly controlled not to exceed 100℃ to prevent the tempering effect from reducing the hardness and affecting the size recovery. When the disassembly is difficult, it is recommended that you use the disassembly tool to pull outwards and carefully pour hot oil on the inner ring. The heat will expand the inner ring of the SKF bearing and make it easier to fall off.
Five, the addition of SKF bearing grease
When lubricating SKF bearings, the more grease is applied, the better. This is a common misconception. Excessive grease in SKF bearings and SKF bearing chambers will cause excessive stirring of the grease, resulting in extremely high temperatures. The amount of lubricant filled in SKF bearings should be 1/2 to 1/3 of the internal space of SKF bearings, and should be reduced to 1/3 at high speeds.
Six, the choice of SKF bearing grease
Lubrication has an extremely important effect on the operation and life of SKF bearings. Here is a brief introduction to the general principles of choosing lubricating grease. Grease is made of base oil, thickener and additives. The performance of different types and different grades of the same type and different grades of grease vary greatly, and the allowable rotation limit is different. Please pay attention when choosing. The performance of grease is mainly determined by the base oil. Generally, low-viscosity base oil is suitable for low temperature and high speed, and high viscosity is suitable for high temperature and high load. The thickener is also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease. In principle, greases of different brands cannot be mixed, and even greases with the same thickener will have a bad influence on each other due to different additives.