F & Z Rolling bearing inspection items are sound, vibration, temperature, lubrication, etc., as follows:
1. Bearing rolling sound
Use audio equipment loudness and sound quality inspection operation of rolling bearings, bearing even a slight peeling and other damage, the sound is not normal tone and irregular measuring device emits sound measurements will be distinguished.
2. Bearing Vibration
Bearing vibration of the bearing damage is very sensitive, such as peeling, indentation, corrosion, cracks, wear, etc. will be reflected in bearing vibration measurement, therefore, through the use of special bearing vibration measurements (frequency analyzer, etc.), measuring the size of the vibration frequency analysis, can be inferred by the following unusual circumstances. Measurement sensors for use or installation conditions of the lower bearing position is different, so the analysis and comparison of each machine requires predetermined criteria measurements.
3. Bearing temperature
Bearing temperature, bearing temperature is generally outside the room, it can be inferred that if the hole can be used to directly measure the temperature of the bearing outer ring, is more appropriate. Typically, the bearing operating temperature for 1-2 hours, slowly reach steady state. Normal temperature of the bearing of the heat capacity of the machine, a large heat capacity, speed and load changes. Stop running if F & Z bearing lubrication operation, install the appropriate department, bearing temperature will suddenly appear abnormally high temperatures in check and troubleshooting, to take the necessary precautions.
F & Z bearing damage inspection after the demolition, according to bearing damage to determine the cause of bearing failure and damage.
1. Raceway surface of the metal foil
Under the periodic pulse load function, roller bearings and outer ring raceway surface, resulting in periodic changes of contact stress. When the stress cycle reaches a certain value, or in the rolling surface of the outer ring raceway work fatigue spalling. If the bearing load is too large, the fatigue worse. In addition, the bearing is installed incorrectly, bending the shaft, there is also a raceway spalling. Fatigue spalling runway operations will reduce the accuracy of the shaft, the body vibration and noise generation.
2. Bearing burns
Burns bearing raceway, rolling temper colors. The reason is usually burns insufficient lubrication, oil quality does not meet the requirements or deterioration, and bearing assembly too tight and so on.
3. Plastic deformation
Bearing raceways and roller contact surface uneven craters, indicating bearing plastic deformation. The reason is that a large static load or an impact load, the working surface of the material yield local stress exceeds the limit, which generally occurs in the low-speed rotation of the bearing.
4. Bearing rings crack
Bearing rings crack may be due to the tight, loose bearing outer or inner ring of the bearing, bearing tolerances deformation, installation of bearings and poor surface finish