Check the use of TIMKEN imported bearing grease

Because TIMKEN imported bearings are high-precision products, if the assembly is improper, it is easy to damage the bearing channel, resulting in bearing damage. The bearing should have a special mold during assembly. It can't be beaten at will. When pressing the shaft, it can only be subjected to small force. When pressing the large circle, it can only be subjected to large force. Air pressure or hydraulic pressure is required for assembly. The upper and lower molds should be outside the horizontal state during press-fit. If the tilting causes the bearing channel to be damaged due to the force, the bearing will be audible.

When the bearing is mounted on the rotor for dynamic balance, it is easy to enter the iron filings generated during the dynamic balance into the TIMKEN imported bearing. Therefore, it is better to balance the load before loading the bearing. Some manufacturers have some oil or grease to lubricate the bearing chamber during assembly. However, it is often difficult for the operator to control the amount. If the oil or grease accumulates in the bearing chamber, the bearing is very rotating. Easy to enter the inside of the bearing along the shaft. It is best not to apply oil or grease to the bearing. If it is not painted, it must be controlled to not accumulate in the bearing chamber.

The characteristic of paint rust is that it is mostly in the sealed motor. The sound of the motor is very good when it is assembled. However, after some time is put in the warehouse, the abnormal noise of the motor becomes very large, and the bearing is severely rusted. In the past, many manufacturers thought that it was a bearing problem. After our constant publicity, the motor factory has now realized that it is mainly a problem of insulating varnish. This problem is mainly caused by the fact that the acidic substance volatilized by the insulating paint forms a corrosive substance under a certain temperature and humidity, and the TIMKEN imported bearing is damaged after the channel is corroded. The problem can only be achieved by selecting a good insulating varnish and venting it after drying for a while.

The life of the bearing is closely related to the manufacture, assembly and use. It must be done at every step in order to keep the bearing in optimal operation and prolong the service life of the bearing.

Drop a few drops of oil on the filter paper and take a clean red filter paper. After the lubricating oil leaks, if there is a black powder on the outside, the hand touch has a feeling of resistance, which means that there are many impurities in the lubricating oil. The good lubricating oil has no powder, and the hand is dry and smooth, and has yellow marks.

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Judging standard for inspection and damage of imported bearings

After the 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.

When disassembling the imported bearing for inspection, first record the appearance of the bearing, confirm the residual amount of lubricant, and after sampling the lubricant for inspection, wash the bearing. As a cleaning agent, gasoline and kerosene are commonly used.

The cleaning of the removed imported bearings is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first so that the bearing does not directly contact the container. When rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.

Fine washing is to carefully clean the bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.

In order to judge whether the removed imported bearings can be reused, check the bearings after cleaning, carefully check the raceway surface, the rolling surface, the mating surface state, the wear of the cage, the increase of the bearing clearance and whether there is any size. Damage and abnormality with reduced accuracy. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.

Separate bearings such as bearings can be inspected separately for the raceway surfaces of the rolling elements and the outer ring. Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the height, the more careful it is necessary to check.

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 are abnormal sounds, changes in the temperature of the imported bearings, 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.

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