In order to fully utilize TIMKEN's imported bearings and maintain their proper performance for a long time, regular maintenance (regular inspection) must be performed.
Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.
1, cleaning
When removing the TIMKEN imported bearings, first take a look at the appearance with photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.
a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.
b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.
c. When washing finely, slowly rotate the bearing in the oil and carry out it carefully.
The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean.
Immediately after cleaning, apply anti-rust oil or anti-rust grease to the bearing.
2, inspection and judgment
In order to judge whether the removed TIMKEN bearings can be reused, it is necessary to check the dimensional accuracy, rotation accuracy, internal clearance and mating surfaces, raceways, cages and seals.
Regarding the inspection result, it can be judged by a person who is using a conventional bearing or a proficient bearing.
The criteria for judgment vary depending on mechanical properties and importance, inspection period, and the like. Bearings must not be reused if they are damaged and must be replaced.
1) Breakage and defects of bearing components.
2) Peeling of the rolling surface of the raceway surface.
Bearing fault identification method
It is important to improve the productivity and economy by identifying or predicting the failure of the bearing in operation without disassembly inspection.
The main methods of identification are as follows:
1) Identify by sound
It takes a lot of experience to identify by sound. Must be fully trained to be able to identify bearing sounds and non-TIMKEN imported bearing sounds. To this end, the work should be carried out by a dedicated person. The sound of the bearing can be clearly heard by attaching a listener or a listening stick to the housing.
2) Identification by working temperature
This method is a comparative identification method and is limited to occasions where the operating state does not change much. For this purpose, continuous recording of the temperature must be carried out. In the event of a fault, not only does the temperature rise, but irregular changes can occur.
3) Identification by the state of the lubricant
Sampling analysis of the lubricant is judged by whether or not the degree of contamination is mixed with foreign matter or metal powder. This method is particularly effective for bearings or large bearings that cannot be placed close to the TIMKEN inlet.
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