Detailed steps for maintenance of TIMKEN imported bearings

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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Daily maintenance precautions for TIMKEN plain bearings

After the TIMKEN bearing is installed, check the operation in order to check if the installation is correct. The small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor operation due to foreign matter, scratches, and indentations. The installation is poor, the torque generated by the mounting is not stable, and the torque is too large due to too small clearance, installation error, and sealing friction. Wait. If there is no abnormality, the power running can be started. Large machinery cannot be rotated manually, so the power is cut off immediately after the start of the no-load, the machine is idling, and the presence or absence of vibration, noise, and contact of the rotating parts is checked. After confirming that there is no abnormality, the power is turned on. The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there is abnormal sound, change in the temperature of the plane bearing, leakage or discoloration of the lubricant, and the like. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.

The temperature can generally be estimated based on the external temperature of the bearing housing. However, it is more accurate to directly measure the temperature of the outer ring of the TIMKEN bearing by using the oil hole. The bearing temperature gradually rises from the start of the operation, and the temperature is usually stable after 1 to 2 hours. If the bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, and the like. In the case of high-speed rotation, the selection of the structure and lubrication method is also the cause.

1. Keep the bearings and their surroundings clean.

Even small dust that is invisible to the eyes can have a bad effect on TIMKEN bearings. So keep the area clean so that the dust does not intrude into the flat bearings.

2. Careful use of the bearing gives the TIMKEN bearing a strong impact during use, which can cause scratches and indentations, which are the cause of the accident. In severe cases, cracks and breaks occur, so care must be taken.

3, use the appropriate operating tools

Avoid using existing tools and use the right tools.

4, pay attention to the corrosion of the plane bearing

When operating the bearing, the sweat on the hand can cause rust. Be careful to use a clean hand, it is best to wear gloves as much as possible.

It is very important to understand that the use of TIMKEN bearings will have a multiplier effect.

When the mechanical parts near the bearing have been lubricated with oil or need to be dissipated by lubricating oil, the bearings should be lubricated with oil. There may be heat dissipation requirements when the bearing is under heavy load or high speed, or when external heat is introduced.

Micro-lubrication methods, such as drip lubrication, oil mist lubrication or oil and gas lubrication, ensure that the oil loss and bearing friction are small.

When air is used as the carrier, the oil can be supplied directly and the gas flow helps to seal.

Where the flat bearing speed is extremely high and where suburban fruit is to be cooled well, a large amount of lubricant can be sprayed directly onto all contact surfaces.

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