Mechanical stress precision, bearing the same, there are different levels of precision, some bearing precision is high, the precision is low. In general, the precision is good, like the SKF bearing precision is very high, so you can rest assured that the use, quality is very good, and SKF bearing precision is very high, so the high precision bearing brand, quality is very good, but generally people don't judge bearing precision, then we have to introduce the diagnosis accuracy and precision of the judgment of the bearings.
Precise diagnosis method of rolling bearing is called, after determining SKF bearing failure has occurred in the use of simple diagnostic method, and further determine the fault type and location, so as to take corresponding countermeasures. The precise diagnosis and rotating machinery, reciprocating machinery and precise diagnosis of rolling bearing, mainly by frequency spectrum analysis method. Due to the vibration frequency of rolling bearing is very rich, which contains low frequency components, but also contains high frequency components, and each kind of specific fault corresponds to the specific frequency component. Through proper signal processing methods will be separated from the specific frequency component prior to spectrum analysis, then the absolute value of the frequency analysis, finally, to find out the characteristic frequency signal, determine the location and type of fault.
SKF bearing raceway damage, such as: peeling, cracking, pitting ( as shown in Figure 1 ), if the rolling shaft without radial clearance, the frequency of nZfi ( n = 1, 2, ... ) The shock and vibration. Rolling bearings are usually a radial clearance, and unilateral load, according to the pitting part and the rolling body impact contact in different position, change of amplitude of vibration will occur periodically, namely amplitude modulation. If the shaft rotation frequency of F, amplitude modulation, frequency of vibration when the nZfi + fr ( n = 1, 2... ) If the rolling body; the frequency ( i.e. cage rotation frequency ) FC for amplitude modulation, frequency of vibration at this time was nZfi ±FC ( n = 1, 2, ... ).
When the SKF bearing rolling body damage, such as cracks, spalling, pitting, defects through the inner or outer ring raceway surface will produce vibration and shock. In the rolling bearing without radial clearance, the frequency of nZfb ( n = 1, 2, ... ) The shock and vibration. Rolling bearings are usually a radial clearance, therefore, with the inner ring in presence of pitting is the same, according to the different parts of the inner or outer ring pitting corrosion and impact contact position, also have the amplitude modulation of the situation, but this is amplitude modulation to the revolution frequency fc.


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