The internal factors of failure of self-aligning ball bearings are mainly three factors include structure design, manufacturing process and material quality determining quality NSK bearings.
Failure is mainly due to bearing two factors deficiency and overload. When the load exceeds the limit strength of the material as a result of parts breaking overload fracture. Overload causes the main host of sudden failure or improper installation. Self-aligning ball bearing parts of the micro-cracks, shrinkage, bubbles, large foreign materials, organizations and local overheating burn and other defects in severe shock or vibration overload will cause fracture in the defect, known as the defect fracture. It should be pointed out, NSK bearing in the manufacturing process, the raw materials into the factory inspection, casting and heat treatment quality control, process control through instruments and accurate analysis of the existence of the defect, it is necessary to strengthen the control of. But generally speaking, failure mostly overload failure of bearing fault is usually thrown.
The main tasks of bearing failure analysis, is based on the analysis of the data and the failure form of the large amount of background material,, find out the main factors causing bearing failure, so as to put forward the improvement measures, extending the service period of NSK bearings, to avoid premature failure of self-aligning ball bearing a sudden.
Bearing in the work, because the influence of external or internal factors, so that the original clearance change, loss of precision, and even cause "killed" known as the clearance change failure. External factors such as excessive interference, the installation is not in place, the temperature rise caused by volume expansion, instantaneous overload, internal factors such as residual austenite and residual stress is not chaos state are mainly caused by the failure of the clearance change.
The metallurgical quality of self-aligning ball bearing material was the main factors affecting the early failure of bearing the move. With the metallurgical technology (such as vacuum degassing of steel bearing) improved, improved quality of raw materials. Raw materials quality factors of failure analysis of the proportion has decreased significantly in the NSK bearing, but it is still one of the main influencing factors of bearing failure. Proper selection is still bearing failure analysis of factors that must be considered.