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Detailed discussion on the smooth method of SKF bearings
Source: China Bearing Network Time: 2014-06-05
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First, the solid is smooth under some special operating conditions; a small amount of solid smoothing agent is involved in the smooth grease; if you participate in 3~5% of No. 1 molybdenum disulfide can reduce wear; improve resistance to heat and heat; about high temperature, elegant and high Vacuum, corrosion resistance, radiation resistance; and special conditions such as extremely low temperature; solid smoothing agent to participate in engineering plastics or powder metallurgy materials; can be made into bearing parts with self-smooth function; It is knotted on the raceway, cage and rollover; it forms a smooth film; it has a certain effect on the reduction of conflict and wear.
Second, the oil is smooth:
Viscosity is an important characteristic of smooth oil; the viscosity of the powder directly affects the fluidity of the smooth oil and the thickness of the oil film formed by the conflicting surface; the viscosity of the smooth oil at the working temperature of the SKF bearing is usually 12-15 cst. The higher the rotational speed, the lower the viscosity; The heavier the load, the higher the viscosity should be. The commonly used smooth oils are mechanical oil, high speed mechanical oil, turbine oil, compacting oil, transformer oil, cylinder oil, etc.
The oil smoothing method includes:
1) Oil bath smooth oil bath smooth is the most common smooth method; suitable for the smoothness of low and medium speed bearings; part of the bearing is immersed in the groove; smooth oil is taken up by the rotating bearing parts; then it flows back to the oil groove Should be slightly lower than the middle of the lowest roll.
2) Smooth dripping oil is smooth and suitable for SKF bearing parts with required supply of smooth oil; the amount of dripping is usually one drop every 3-8 seconds; too much oil will lead to higher bearing temperature.
3) The circulating oil is smooth and the oil is pumped to the bearing parts; the smooth oil after the bearing is filtered and cooled, and then used. Because the circulating oil can take away certain heat; the bearing is cooled; therefore, the method is suitable for high speed. Bearing parts.
4) The spray is smooth and boring with compressed air and sprayed with smooth oil to form an oil mist; in the eruption bearing; the air flow can effectively cool the bearing and avoid the intrusion of impurities. This method is suitable for the smoothing of high-speed, high-temperature bearing components.
5) The illuminating and sliding oil pump pumps the high-pressure oil into the bearing through the nozzle; the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the SKF bearing rotates at a high speed; the rolling body and the cage also make the surrounding at a moderately high rotational speed. The air constitutes the airflow; it is difficult to send the smooth oil to the bearing in a generally smooth manner; in this case, the smooth oil must be sprayed into the bearing by means of a high-pressure eruption; the nozzle should be placed between the inner ring and the middle of the cage.
SKF bearing kurtosis is not large; today the use of data collectors has been more than ever. But in the useful focus on the trick. About the oscillation is not large. The spectrum is oscillating oscillating signal; when it is difficult to determine whether there is any problem at the scene; the oscillating signal is collected back; Passed to the computer for fine profiling. At this moment; first routine analysis; see if the oscillation velocity spectrum and bearing kurtosis can be close to the specification; then use the power spectrum to investigate whether the oscillation energy can be overrun; if the power spectrum is not large; investigate the various frequencies in the spectrum Ingredients. If the spectral line corresponds to the frequency of the power frequency, it should focus on finding the fault in the layout of the unit. If it is a power frequency fraction; if it has more decimal frequencies, it should focus on finding the SKF bearing frequency; if there is; Bearings have problems; if not; need to be vigilant after sweeping other parts; strengthen monitoring. Practice found that many oscillations do not overspend; and present bearing fault cases. Once the bearing characteristic frequency or near bearing characteristic frequency spectrum is presented; Then according to the magnitude of the large.
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