INA imported bearing failure analysis of the basic requirements

INA imported bearing condition is good or not is directly related to the operation of the rotating equipment state, bearing is very extensive application in the equipment. Especially in the continuity of production enterprises, a large number of applied to the important parts of the large rotary equipment, therefore, in practical production for bearing condition monitoring and fault diagnosis is an important part of the good equipment maintenance and management. After temporary practice and exploration, has accumulated some practical skills actual bearing fault diagnosis. The INA imported bearing condition monitoring and fault diagnosis of vibration analysis is practical method. Must pay attention to the signal acquisition is accurate, true and practical in the need to pay attention to choose the location of the measuring point and sampling method. To accurately reflect the real state of bearing vibration. So to where the nearest bearing arrangement of measuring points, the motor fan cover after generally have free end, the selecting the fan cover screw has good monitoring effect. In addition must pay attention to many times of the vibration signal acquisition and analysis, comprehensive to match. Ability to get accurate conclusion. INA bearings imported in its use in the process of showing a strong regularity, temporary production condition monitoring. And the repeatability is very good. Normal high quality bearing, at the beginning of the use of vibration and noise are relatively small, but there are some scattered of spectrum amplitude is small, may be due to some defects in the process of manufacturing, such as appearance burr. Maintain a certain level of vibration and noise, movement after a period of time. Spectrum is very single, only one or two times the frequency. More than three times the power frequency spectrum, seldom appears bearing condition is very stable, steady working period. After the bearing vibration and noise began to increase, continue to run late into use. Sometimes a different tone, but the change of vibration increase is relatively slow, at this point, the bearing kurtosis value began suddenly reaches a certain value. Think, this time the bearing is expressed as the early failure. Requires that the bearing is closely monitoring, at this time. Pay close attention to the change. Then, bearing kurtosis value began falling fast, and is close to normal, and significant increase in vibration and noise, it began to accelerate, increasing when vibration exceeds standard ( Such as ISO2372 specification) Its bearing kurtosis value also began to increase rapidly, when both beyond specification, vibration and kurtosis value is beyond normal, Available kurtosis relative standard) Think that INA import bearing fault has entered the late production, should be timely maintenance equipment, replace the bearing. The equipment capacity, the greater the bearing fault feature late expressed to the severe fault ( For bearing damage, such as holding shaft commonly, burns, sand spallation, raceway, wear beads, etc. ) Most of time not more than a week. The faster the speed, the shorter the time interval. In actual bearing fault diagnosis, therefore, once found late fault characteristics, should be decisive judgment is bearing fault, arrange inspection as soon as possible. INA import bearing assembly quality index, namely assembly accuracy requirement is mainly radial clearance and width. Axial clearance and has the certain function relation between radial clearance. Therefore, can be indirectly controlled by controlling the radial clearance axial clearance. For deep groove ball bearings, cylindrical roller bearings, self-aligning ball bearings and spherical roller bearings, main control radial clearance. For thrust ball bearings, thrust roller bearings and tapered roller bearings, main control the height and width. For angular contact ball bearing, mainly control the size of contact Angle. Are basic requirements of the rolling bearing assembly: on the premise of guarantee assembly quality index, make us set rate is high, the general should be more than 95%.