Bearing in operation can not be observed directly, but by the conditions such as noise, vibration, temperature, lubricants may be perceived the bearing abnormal. Bearing a representative example of the injury;
1 cracks
Cracks gap. The reason: the host of the impact load is too large, spindle and bearing with interference large; also because cracks peel friction; accuracy and installation; improper use (with pink woodsorrel, snaps into large foreign body) and friction cracks.
Countermeasures: check the conditions of use set appropriate interference and check the material to improve the method of installation and use, check the lubricant to prevent friction cracks.
2 surface metal raceway peel
Running surface stripping. After stripping was uneven. Causes the bearing rolling elements and the inner and outer ring raceway surface are exposed to periodic pulsating loads, thereby generating a periodic variation of contact stress. When after stress cycles reaches a certain value, the rolling element or the outer ring raceway surface fatigue peel. If the bearing load is too large, will this fatigue exacerbated. In addition, the bearing installation errors, axis curved the peeling will produce raceway.
Countermeasures: You should re-examine the conditions of use and select the bearing clearance and check the machining accuracy of shaft and housing, installation methods, lubricants and lubrication methods.
3, burns
Bearing heating discoloration, thereby burn can not be rotated. Burn is generally insufficient lubrication; the quality of lubricating oil does not meet the requirements or deterioration, and tight bearing assembly. Another clearance is too small and the load is too large (preload large) roller skew.
Countermeasures: Select the appropriate clearance (or increase), you want to check the type of lubricant to ensure that the injected amount and check the conditions of use to prevent positioning errors, improve the bearing assembly method.
Cage fragmentation
Rivets loose or broken, rolling body broken. Reasons: torque load is too large, lack of lubrication, frequent changes in speed, vibration, bearing installed in the inclined state, snaps into the foreign body.
Countermeasures: To find the conditions of use and whether it is appropriate lubrication state, note the use of the bearing, research cage choice whether appropriate and the rigidity of the bearing box load requirements.
5 creep
The inner diameter surface or outer diameter surface slip, causing the mirror or discoloration, sometimes jammed. Reasons: lack of interference with the Department, not enough sleeves fastening abnormal warming host load is too large.
Strategy: To re-examine the appropriateness of the amount of interference, check the conditions of use, check the shaft and the bearing housing precision.
6, rust corrosion
Surface rust partial or full, rolling element varying lines like rust. The reason: poor storage condition, improper packaging, rust inhibitor, water acid-soluble agent invasive direct bearing with the hand.
Strategy: To prevent rust in custody, regularly or irregularly re-oiled packaging, to strengthen the sealing performance, periodically check the oil, the oil quality or deterioration must be promptly replaced to correct bearing.
7. Bearing indentation
Damage state: bite into a small metal powder, foreign body, or rotating surface raceway dent. The impact when the installation, etc., in the concave formed on the pitch spacing of the rolling body (Brinell hardness indentation).
The reason: a metal powder, such as foreign body bite into. When assembled or during transport by the impact load is too large.
Measures: the impact of the sleeve. Improved sealing means. Filter lubricants. Improved assembly and method of use.
8. Bearing wear
Damage state: the so-called wear is caused due to friction and the raceway surface or rolling surface, the roller end surface, a concave surface of the collar surface and the holder and wear.
Reason: foreign invasion, rust galvanic corrosion caused by the development. Poor lubrication. A slip caused due to the irregular motion of the rolling bodies.
Measures: to improve the sealing device. Cleaning bearings boxes. Fully filtered lubricant. Check the lubricant and lubrication method. Prevent non-linear.
Bearing false brinelling
Injury status: in during microvibration, the contact part of the rolling elements and raceway wheel wear caused by vibration and shaking development generated tired like Brinell indentation imprint.
The reason: during transport medium bearing vibration and oscillation when stalled. Small amplitude of the oscillating movement. Poor lubrication.
Measures: the bite of the shaft and the bearing housing to be fixed during transport. Transport of the inner ring and the outer ring to be packaged separately. Plus preload Vibration Reduction. The use of a suitable lubricant.
10. Bearing burns
Injury status: raceway wheel, the rolling body as well as the cage rotation fever until the discoloration, softening sharp, deposition and breakage.
Reason: poor lubrication. Excessive load (preload too large). Speed ??is too large. The clearance is too small. Water, and the invasion of foreign substances. Axis, the accuracy of the bearing box is poor, a large deflection of the shaft.
Measures: lubricants and lubrication methods. Correct choice of the bearing. Research with the bearing clearance and preload. Improved sealing means. Check the shaft and bearing box accuracy. Improved installation method.
11. Bearing rust, corrosion
Injury status: rust and corrosion of bearing raceway wheel rolling surface the pit like rust, comprehensive rust and corrosion.
Reason: the intrusion of water, corrosive substances (paint, gas, etc.). The lubricant inappropriate. Due to the condensation of water vapor with water droplets. High temperature and humidity when stopped. The transport process heavy anti-rust adverse. Custody status is inappropriate. The use of inappropriate.
Measures: to improve the sealing device. Research lubrication method. Stood rust measures. Improved custody of methods. Used to be noted.
12. Bearing discoloration
The damage status: Because the temperature rise and lubricants reaction raceway wheel, and rolling elements and cage discoloration.
Reason: poor lubrication. And a reflection of the lubricant to cause the thermal state of immersion oil. Temperature rise.
Measures: improve lubrication method.
The more we avoid do timer overhaul bearings can guarantee normal bearing life and performance.
 



Other News:
Damage causes and protect measures of bearings
Italian election inconclusive; global markets drop
AP survey: US budget impasse holding back economy
South Korea's new president demands North drop nuclear ambitions
Hatoyama Yukio said completely disappointed with the Democratic Party will begin
Ahead of the Bell: Oil supplies expected to rise
Japan govt to nominate ADB Kuroda as next BOJ head
Rocket explodes in Israel, first attack from Gaza since truce