1 bearing temperature
In the body running, install the bearing parts to allow a certain temperature, when the body shell when touched by hand, should not feel hot to normal, otherwise it indicates that the bearing temperature.
Bearing temperature is too high for two reasons: oil quality does not meet the requirements or deterioration, lubricant viscosity is too high; body assembly too tight (lack of space); bearing assembly too tight; bearing ring on the shaft or shell rotation; load too large; or roller bearing cage fragmentation and so on.
2 bearing noise
Rolling in the work operation to allow a slight noise, if noise is too large or unusual noise or crash, it indicates that the bearing is faulty.
Rolling noise is more complex reasons, one is the bearing inner and outer rings with surface wear. Since this in the kind of wear, damage to the bearings and housings, bearings and shaft relationship, leading to deviation from the correct location of the axis, the axis generate abnormal sound in the high-speed movement. When the bearing fatigue, it’s peeling off the metal surface, the bearing radial clearance will also increase the generation of abnormal sound. In addition, the lack of bearing lubrication, the formation of dry friction, and crushing, etc. will have a bearing abnormal sound. After bearing wear, loose cage damage, bearing damage will produce abnormal sound.
Rolling demolition inspection, according to the bearing of injuries and damage to determine the cause of bearing failure.
1 raceway surface of the metal flake
bearing rolling elements and inner and outer raceway surfaces are under periodic pulsating load effect, resulting in cycle
the contact stress. When the stress reaches a certain value cycles, in the rolling body or the outer ring raceway fatigue spalling on the work surface. If the bearing load is too large, this fatigue worse. In addition, the bearing is not properly installed, shaft bending, also have a raceway spalling. Raceway will reduce the fatigue spalling axis running accuracy, so that institutions place vibration and noise.
2 bearing burns
its roller bearing burn, rolling on the temper color. Reason burns usually insufficient lubrication, oil quality does not meet the requirements or deterioration, and the bearing assembly too tight and so on.
3 plastic deformation
Bearing raceway and roller contact surface uneven pits, indicating the bearing plastic deformation. The reason is that a large static load bearing or impact loading, local stress over the working surface of the material yield limit, which
Case generally occurs in low-speed rotation of the bearing.
4 bearing ring crack
Bearing ring may be due to cracks with tight bearing, the bearing inner ring of foreign or loose, the bearing deformation of the inclusive parts, install the bearing surface finish and poor.
5 cage fragmentations
the reason is insufficient lubrication, rolling broken seat askew and so on.
6 cage of metal adhesion on the rolling
possible reason is that being stuck in the roller cage or in insufficient lubrication.
7 serious wear seat raceway
May fall into the foreign body is the seat of the circle, lack of lubrication or improper oil grades.



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