Then IKO bearing vibration inspection, to see if the bearing damage is very sensitive, whether the peeling, indentation, rust, cracks, wear, etc. will be reflected in the bearing vibration measurement, so by using a special automotive bearing vibration measuring device (frequency analysis The magnitude of the vibration can be measured, and the specific situation of the abnormality cannot be inferred by the frequency division. However, the value measured by each machine differs depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
IKO bearing parts are affected by abnormal high temperature during use, and they are not cooled in time. The phenomenon of high temperature tempering or secondary quenching on the surface of the parts is called burn.
The main causes of burns are poor lubrication, excessive neck load, improper clearance selection, improper bearing arrangement, poor contact on the raceway surface, and excessive stress. Such as;
1) In the axial swimming bearing, if the external factor is too tight, it cannot move in the housing hole;
2) The operating temperature rises during the operation of the bearing, and the thermal expansion of the shaft causes a large axial force, and the bearing cannot move axially;
3) Due to insufficient lubrication, or unreasonable selection of lubricants, quality problems, aging and deterioration;
4) The internal and external temperature difference is large, and the upstream gap is improperly selected.
5) The load on the IKO bearing is too large and the load distribution is uneven, forming stress concentration;
6) The surface of the part is rough, which causes poor contact or oil film formation.
The topographical features of burns can be judged according to the small color of the surface. IKO bearings in use due to lubricants, temperature, corrosion and other reasons, the surface of the parts will change, the color is mainly light yellow, yellow, brown red, purple blue and blue black, etc., of which yellow, yellow, brown red shavings Discoloration (see related content below), if purple blue or blue black appears, burn as appropriate. Burns can easily cause the surface hardness of parts to drop or micro-grain.
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