Generally, the temperature of IKO bearing starts to rise slowly with the operation of the bearing, and reaches a stable state after 1-2 hours. The normal temperature of the turbocharged bearing varies with the heat capacity, heat dissipation, speed and load of the machine.
If the lubrication and installation are not appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.
Internal failure and fracture failure analysis of IKO supercharger bearing
Using the thermal sensor, the working temperature of IKO bearing can be monitored at any time, and the automatic alarm or stop when the temperature exceeds the specified value can be realized to prevent the occurrence of combustion shaft accident.Internal failure and fracture failure analysis of IKO supercharger bearing
High temperature often indicates that the bearing is in an abnormal condition. High temperature is also harmful to the lubricant of the bearing. Sometimes overheating of turbocharged bearings can be attributed to the lubricant of the bearings.
If the temperature of IKO bearing exceeds 125 ℃ for a long time, the bearing life will be reduced. The causes of high temperature bearings include insufficient or excessive lubrication and lubricant. The oil seal contains excessive clearance, insufficient friction, etc.Internal failure and fracture failure analysis of IKO supercharger bearing
Therefore, it is necessary to continuously monitor the temperature of IKO bearing, whether measuring the turbocharger bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.Internal failure and fracture failure analysis of IKO supercharger bearing
The periodic measurement of bearing temperature can be aided by thermometer, such as bearing digital thermometer, which can accurately measure the temperature of turbocharged bearing and display it in ℃ or Fahrenheit.Internal failure and fracture failure analysis of IKO supercharger bearing
The important IKO bearing means that when it is damaged, it will cause the shutdown of the equipment. Therefore, this kind of turbocharged bearing should be equipped with temperature detector.Internal failure and fracture failure analysis of IKO supercharger bearing
Under normal circumstances, IKO bearings will have a natural temperature rise after just lubrication or re lubrication and last for one or two days.Internal failure and fracture failure analysis of IKO supercharger bearing
The internal factors of IKO bearing failure mainly refer to the three factors that determine the quality of supercharger bearing, such as structural design, manufacturing process and material quality.Internal failure and fracture failure analysis of IKO supercharger bearing
The main causes of bearing fracture failure are defect and overload. When the external load exceeds the material strength limit and causes the part to break, it is called overload fracture. The main cause of overload is the sudden failure or improper installation of the host.
The defects of IKO bearing parts, such as microcracks, shrinkage cavities, bubbles, large foreign objects, overheated tissue and local burns, will also cause fracture at the defect during impact overload or violent vibration, which is called defect fracture.
It should be pointed out that in the manufacturing process of supercharger bearing, the presence of the above defects can be correctly analyzed by instruments in the factory re inspection of raw materials, quality control of forging and heat treatment and processing process control, and the control must be strengthened in the future. But generally speaking, most of the bearing fracture failures are overload failures.
The main task of bearing failure analysis is to find out the main factors causing bearing failure according to a large number of background materials, analysis data and failure forms, so as to put forward targeted improvement measures, prolong the service life of supercharger bearing and avoid sudden early failure of IKO bearing.
During the operation of the bearing, due to the influence of external or internal factors, the original matching clearance is changed, the accuracy is reduced, and even “bite” is called clearance change failure.
External factors such as excessive interference, improper installation, expansion caused by temperature rise, instantaneous overload, etc., and internal factors such as residual austenite and residual stress in an unstable state are the main reasons for the change and failure of clearance.Internal failure and fracture failure analysis of IKO supercharger bearing
The metallurgical quality of IKO bearing material was once the main factor affecting the early failure of rolling bearing. With the progress of Metallurgical Technology (such as vacuum degassing of bearing steel), the quality of raw materials has been improved.
The proportion of raw material quality factor in turbocharger bearing failure analysis has decreased significantly, but it is still one of the main influencing factors of bearing failure. Proper material selection is still a factor that must be considered in bearing failure analysis.