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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Check and maintenance points of TIMKEN bearing grease stability

   The bearing 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 bearing structure and the lubrication method is also the cause.
The rotation of the bearing is checked with a stethoscope, etc., and there are strong metal noise, abnormal sounds, irregular sounds, etc. to explain the abnormality. The reasons are poor lubrication, poor accuracy of the shaft or housing, bearing damage, and foreign matter intrusion.
    The divergence of the grease in the TIMKEN bearing is a divergence. It must be composed of a relatively straight draft. It should be short-lived. The bearing temperature is low and stable during long-term operation. This is a fantasy. Grease, so the grease is particularly important.
    In the popular situation, the grease filling amount in the TIMKEN bearing always exceeds the practical requirement of direct intervention lubrication, saturating the cavity on the frame and the bearing cover, and forming a contour on the periphery of the rolling element. During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the beginning of the run, the grease that is squeezed into the raceway attachment may still be transferred to change the rolling element into the raceway.
    In the early stages of bearing operation, most of the grease is squeezed out of the raceway very quickly (less than one minute), and accumulated in the grease retaining body after the bearing migration transition body, and is discharged a small amount. At this time, the bearing temperature will continue to rise until the excess grease is completely discharged. It can be called the grease's running phase. According to the grease quality and filling amount in the bearing structure, this time may last for ten minutes. And even hours.
    When grease is added to anti-friction bearings, high pressure theory may not be required unless it is used with great care. High pressure can damage bearings, waste grease, excessive grease can cause high temperatures and create an invisible environment around TIMKEN bearings. In most applications, ball or roller bearings are fully lubricated if the grease level is between one-third and one-half of the bearing capacity. The excess will usually be wasted by the sealed casing.
    The anti-friction bearings in all TIMKEN bearings basically contain two hardened steel rings, multiple hardened balls or rollers, and a separate cage or cage for separating the rollers or rollers. These types are divided into many categories in use. Some types, such as needle-like column bearings, may have no inner ring and the rollers move directly on the hardened shaft.

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