Criteria based on the mechanical properties and importance as well as the examination cycle varies. If the following injury, single direction thrust ball bearings may not be reused and must be replaced. In the course of bearings, grease is critical. If using bad grease, not only won’t have the effect, but also can damage the bearings.
Twist repeated grinding lubricant between the thumb and index finger, Good lube in hand, you feel better lubricity, less debris, no friction, if you feel a larger sense of friction between the fingers, it indicates that oil impurities, it no longer works, new lubricating oil should be replaced.
When the one-way bearing operates, rolling it across the raceway surface and make a slippery continuum sounds, is the basic sound of all rolling bearings which is unique. General bearing sounds are raceway acoustic sound combined with other sounds. Ball bearing raceway acoustic sound is irregular, above 1000Hz frequency, which primary frequency does not change with the speed, but the overall sound pressure level increases with accelerating speed. Bearing with big raceways acoustic sound, its acoustic sound pressure level diminishes with the increase of viscosity while bearing with small Raceway acoustic sound, its sound pressure level in the viscosity increases to about above 20mm/s, by reduction to increase. The greater rigidity the bearing block has, the lower the overall sound pressure level. Method of controlling the rolling acoustic sound: choose low noise bearings (small corrugated bearing), carefully choose the use conditions. Raceway acoustic noise affects the whole noise of the machinery, so Raceway reduction can reduce the noise of machinery as a whole.
Metallurgical quality of single direction thrust ball bearings used to be the main factors affecting the early failure of the bearing. As metallurgical technology (such as vacuum degassing of steel of bearings, etc.) increases, and quality of raw materials improved, raw materials quality factors in the failure analysis proportion has dropped significantly, but it still is one of the main factors affecting bearing failure. Selection of propriety still must be taken into account factors in bearing failure’s analysis.
Main tasks of single direction thrust ball bearings failure analysis is, based on the large amount of background material, analysis of data and failure modes, identify the main factors contributing to failure so that targeting measures for improvement, extending service period of roller bearings, avoiding unexpected early bearing failure.
Single direction thrust ball bearings vibration affect on bearing failure significantly, such as: peeling, pressure trace, rust, crack and wear. These will reflect out in bearing vibration detection, so through used special bearing vibration measuring device (frequency Analyzer and vibration instrument) can measure out vibration size, through frequency distribution can be inferred through details of abnormal vibration of the measured value, bearing using the premise or the sensor installation location differs.
1, reason: within the bearing shell lapping
Method: replace the bearings and related wear parts
2, reasons: poor lubrication
Method: select required grade of lubricating materials and properly cleaned
3, reasons: the belt is over tightening
Method: adjust belt tension properly
4, reason: spindle bends or tank holes are not concentric
Method: repair the spindles or box
5, reason: low assembly quality
Method: improve assembly quality
6, reason: precision bearings low
Method: choose the required accuracy of bearing
7, reason: axial force is too large
Method: clean, adjust the sealing mouth ring clearance (between 0.2~0.3mm), correct diameter of the impeller balancing hole and check static balance value
8, reason: bearing damaged
Method: replace bearing