Bearing fracture failure mainly due to the defects overload two factors. When the applied load exceeds the material strength limit, causing parts breakage called overload fracture. Overload Host sudden failure or improper installation. Bearing parts of the micro-cracks, shrinkage, bubbles, bulk foreign debris, overheating organizations and local burn defects in shock overload or excessive vibration will cause the defect at the fracture, fracture called defective. It should be noted that, bearing retest of the raw materials into the plant, forging and heat treatment in the manufacturing process, quality control, process control can be correctly analyzed by the instrument above defect exists, control must be strengthened in the future. But, in general, usually bearing fracture failure failure most of overload.
Bearing due to external or internal factors at work, so that the original with the gap changes, reduced accuracy, and even cause "killed" called the clearance change failure. External factors, such as excessive interference is not installed in place, the amount of temperature rise due to expansion, instantaneous overload, internal factors such as residual austenite and residual stress in an unstable state and so is the main reason for the changes in the clearance failure.
One of the important indicators to measure the low temperature performance of bearing grease low temperature torque at low temperatures (-20 ° c below) Grease block low-speed flow of the degree of rotation of the bearing, grease the low temperature torque starting torque and rotation 60mm torque mean value. The bearing grease evaporation (degrees) denotes the long-term use of the grease under high temperature conditions, the degree of volatilization of grease oil, and evaporated, the smaller the better. Lipid evaporation mainly depends on the nature of the lubricating oil and distillate.
Oxidation Stability refers to the use of the grease in the long-term storage or long-term high temperature resistance to the role of the heat and oxygen, and the ability to maintain its nature does not occur permanent change. Often occurs due to oxidation, reduce free alkali content or free organic acid content increases, the dropping point decline, appearance become darker in color, a different smell, consistency, strength limit, similar to the viscosity decreases, generate corrosive product and destruction grease structure substances, soap oil separation. Therefore, in the the grease long-term storage, it should be stored in dry and ventilated environment, prevent sun exposure, and should regularly check the free base or free organic acids, corrosive and other changes to ensure its quality and performance.



Other News:
Summarize Spherical roller bearings advance the cause of failure
The replacement bearings decision
Injury of deep groove ball bearings simple correction technique
Fever handling different types of spherical bearing
Bearing failure of the life of several influencing factors
Thrust ball bearings thrust ball water solution
To prevent bearings burns points to note
Maintenance way to prevent high burn of angular contact ball bearings