1  Requirements for installation surface and installation site

If the SKF bearing http://www.alierbearings.com/brand/skf/index.html has iron chips, burrs, dust and other foreign material enter, will make SKF bearing to produce noise and vibration during operation, even damage the raceway and rolling body.

Therefore, before you install the SKF bearing, you must ensure that the installation surfaces and the installation environment are clean.

2  SKF bearing must be cleaned before installation

SKF bearing surfaces are coated with anti-rust oil, and you must clean it carefully with clean gasoline or kerosene, and then apply it with a clean, high quality or high temperature lubricating grease.

The effect of cleanliness on the life and vibration of SKF bearings is very large.

However, we should remind you that the fully enclosed SKF bearing is not to be cleaned.

3   Choice of grease

Lubrication has a very important effect on the operation and life of SKF bearing. This is a brief introduction to the general principle of choosing grease.

Grease made out of base oil, thickener and additive, different types and different type of same kind grease properties vary widely, allowing the rotation of the limit, when the choice is important to note.

The performance of grease is mainly determined by base oil. The basic oil of low viscosity is suitable for low temperature, high speed and high viscosity for high temperature and high load.

The thickener also relates to lubricating properties, and the water resistance of the thickener determines the water resistance of the grease.

In principle, brand different grease can not mix, and even the grease of the same thickener will have a bad effect on different additives.

4  oil addition

When lubricating, the more grease the better, this is a common misconception.

Excessive oil in SKF bearings and SKF bearings will cause excessive agitation of grease, resulting in extremely high temperature.

The number of SKF bearing lubricants filled with SKF bearing inner space 1/2 ~ 1/3 should be reduced to 1/3 in high speed.

5.  Installation and disassembly of SKF bearings

Do not hammer the SKF bearing end face and the non-stressed surface directly, and the SKF bearing should be uniformly stressed by pressing block, sleeve or other mounting tools. Do not pass the power installation by rolling body.

If the installation surface is lubricated, the installation will be smoother.

If the interference fit is larger, should put the SKF bearing in the mineral oil in installation as soon as possible after heating to 80 ~ 90 ℃, strictly control the oil temperature does not exceed 100 ℃, in order to prevent the effect of tempering hardness decrease and recovery effect size.

It is recommended that you use the disassembly tool to pour hot oil into the inner ring while removing the difficulty. The heat will expand the inner ring of the SKF bearing and make it easy to fall off.

6  SKF bearing radial clearance selection

Not all SKF bearings require minimum work clearance, you must select the appropriate clearance according to the conditions.

In the national standard 4604-93, the radial clearance of rolling SKF bearings was divided into five groups -2 groups, 0 groups, 3 groups, 4 groups and 5 groups. The clearance values were small to large, with 0 group being the standard clearance.

The basic radial clearance group is suitable for general operating conditions, conventional temperature and commonly used overreach.

SKF bearings working under special conditions such as high temperature, high speed, low noise and low friction are suitable for large radial clearance.

With the SKF bearing of the spindle and the main shaft of the machine tool, small radial clearance should be selected.

The roller SKF bearing can maintain a small amount of work clearance.

In addition, the SKF bearing of the separation type is indifferent to the clearance;

Finally, imported SKF bearing installed after work clearance, than the original clearance before the installation is small, because the SKF bearing rotation, to absorb a certain amount of load and SKF bearing fit and load produced by the elastic deformation.