Common problems of rolling bearings and their causes (3)

Source: Bearing network time: 2018-01-11

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It can be seen from the above that the rolling bearing can be adjusted regardless of the gap or the gap is not adjustable; they are adjusted in the axial clearance when installing (but some bearings with non-adjustable clearance do not need to leave axial clearance); The thermal elongation; then ensure the normal operation of the tumbler. If the axial clearance is too small; the bearing transformation will be difficult and hot; even if the rolling body is stuck or broken, if the axial clearance is too large, it will cause work to occur. A strange sound; or even a severe oscillation or damage to the cage.
E. The coupling is not properly aligned. The input shaft of most working equipment is connected to the power shaft through the coupling; therefore, it is necessary to perform the alignment of the coupling when installing; the driving shaft and the driven shaft are on the same axis.
.3) Smooth oil (or smooth grease) used in smooth poor rolling bearings has a certain working temperature; when the temperature is too high, it will change; then the smoothing effect is lost; the bearing is burnt due to high temperature. Other; smooth oil (or smooth grease) poor self-property or refueling (fat) at work; it will also form a rise in bearing temperature or abnormal sound.
.4) Rotor imbalance Generally speaking, the rotor of the working equipment must be moved and statically balanced before installation; therefore, the bearing will not present problems. However, some rotors are subject to corrosion or solids during the working process due to medium corrosion. Wear of impurities; or the axis is tortuous; it will cause unbalanced centrifugal force; then the bearing will heat up and oscillate; the raceway will be severely worn; until it is damaged.
.5) Check if the replacement is not in time for the bearing work; check according to the rules; if there is heat, abnormal sound, oscillation, etc.; timely parking to find the reason; eliminate the problem; if the bearing finds severe fatigue, oxidative corrosion, Wear pits, cracks, hardness reduced to HRC <60; or when excessive noise can not be adjusted; should be replaced in time. If the inspection and replacement are not timely; it will form severe damage to the bearing and even the rotor; then affect the normal production. Others; the bearing is not properly disassembled, the equipment anchor bolts loosely form the oscillation; it will also cause the bearing raceway and the rolling body to be indented; the bearing inner and outer races are cracked.
3. Ways to eliminate the problem. 1) When replacing the bearing; look carefully at the new bearing; take a detailed look at the shaft diameter and the housing bore and rotor,
.2) When installing and disassembling the bearing; strictly carry out the overhaul process; carefully operate; prevent the bearing damage caused by improper assembly and disassembly,
.3) Refueling on time; ensuring that the bearing work condition is always outstanding.
.4) Careful review during work; find faults; eliminate them in time.

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