First, the vibration of the bearing
Bearing vibration is very sensitive to the damage to the bearing, such as peeling, creasing, corrosion, cracks, wear, etc. will be reflected in bearing vibration measurement, through the use of special bearing vibration measurement (frequency analyzer) to measure the vibration The size of the frequency points can not infer the specific situation of the abnormality. After the measured values because fag conditions of use or the sensor-mounted position of the bearing or the like, therefore requires the measurement values of each machine in advance for analysis and comparison to determine the criterion.
Second, the temperature of the bearings
The bearing temperature, generally, the outside temperature of the bearing chamber can be inferred, and if the use of suitable hole can directly measure the temperature of the bearing outer ring, even more bit.
Temperature of the bearing as the bearing is running slowly began to rise after 1-2 hours to reach a steady state. The bearing normal temperature varies due to the heat capacity of the machine, the amount of heat, the rotational speed and load. If appropriate lubrication, installation, bearing temperature will rise abrupt, abnormal high temperature must stop running, take the necessary precautions.
Thermal sensors can monitor the bearing temperature, and automatic alarm or stop to prevent burning shaft accident occurred when the temperature exceeds the specified value.
High temperatures often expressed in an abnormal situation. The high temperature is also harmful to the bearing lubricant. Sometimes bearing overheating can be attributed to the bearing lubricant. If the bearing timken bearings life even move to reduce the long-term temperature over 125 ℃. High-temperature bearings caused by reasons including: lack of lubrication or over lubrication, lubricant. Contains impurities, the load is too large, bearing loss of the ring, the lack of space, and oil seals produce high friction, and so on.
Continuous monitoring bearing temperature is therefore necessary, in either measurement bearing itself or other important parts. If it is in the case of operation conditions unchanged, any change in temperature can be expressed has malfunctioned.
Regular bearing temperature measurement by means of a thermometer, digital thermometer can accurately measure the bearing temperature according ℃ or Fahrenheit temperature fixed units.
Rolling bearings demolition inspection, bearing damage to determine the reasons for bearing failure and damage.
1 surface metal raceway spalling
Bearing rolling elements and the inner and outer ring raceway surface are exposed to periodic pulsating action of the load, thereby generating a periodic variation
Contact stress. When after stress cycles reaches a certain value, the rolling element or the outer ring raceway work surface to produce fatigue spalling. If the bearing load is too large, will this fatigue exacerbated. In addition, the bearing installation errors, shaft bending, will produce the raceway flaking. Bearing raceway fatigue spalling will reduce the running accuracy of the shaft, the institutions vibration and noise.
2. Bearing burns
Burn bearing its raceway, rolling element tempering color. Burn is generally insufficient lubrication, the quality of lubricating oil does not meet the requirements or deterioration, and tight bearing assembly.
3 plastic deformation
Raceway and roller contact surface uneven pits bearing plastically deformed. The reason is that the bearings in large static loads or impact loads, the working surface of the local stress exceeds the yield limit of the material, which generally occurs in the low-speed rotation of the bearing.
4 bearing circle crack
Bearing race cracks may be due to the bearing with tight, loose bearing foreign or inner ring, bearing inclusive deformation, poor installation of the bearing surface processing.
5. Cage fragmentation
The reason is the lack of lubrication, rolling body crushing, such as seat skew.
6. Holder metal adhesion on the rolling body
The possible reason is that the rolling body is locked within the holder or insufficient lubrication.
7 seat raceway severe wear
Might fall into foreign body, lack of lubricating oil or lubricating oil grades inappropriate Block circle.


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