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Analysis of the "Five Major Faults and Causes" in the Work of Imported Bearings

Source: Bearing network time: 2014-08-18

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Check that the project has poor work due to foreign objects, scratches and indentations; the equipment is not good; the torque generated by the equipment seat is not stable; the torque is too large due to too small clearance, equipment error, seal conflict, etc. If there is no abnormality, you can start to remind you that the large machinery can't be rotated manually; therefore, the power is blocked immediately after the no-load start; the machine is idling; check whether there is oscillation, noise, whether the rotating parts can touch, etc.; Enter the power work.
Power work; starting from no-load low-speed; slowly progressing to additional work for the specified conditions. Check the items in the test work; whether there are abnormal sounds, changes in the temperature of the imported bearings, leakage or discoloration of the smoothing agent, etc. If found Abnormal; should work intermittently; view the machinery; if necessary, remove the bearing to view.
Imported bearing temperature; generally can be estimated according to the external temperature of the bearing housing. However, the oil hole is used to directly measure the temperature of the outer ring of the bearing. The bearing temperature is gradually increased from the beginning of the working; the temperature is stable after 1~2 hours. If the bearing is stable The equipment is bad; the temperature will rise sharply; the abnormal temperature will be abnormal. The reasons are such as excessive smoothing agent, too small bearing clearance, poor equipment, excessive conflict of sealing equipment, etc. High-speed rotating occasions; faulty selection of imported bearing layout and smoothing method Etc. is also the reason.
The transition sound of imported bearings is viewed with a stethoscope, etc.; there are strong metal noise, abnormal sounds, irregular sounds, etc. to clarify the abnormality. The reasons are poor smoothness, poor accuracy of the shaft or bearing housing, bearing damage, foreign matter intrusion, etc.
The bearing trading network professor reminds you that the common problems of imported bearings are as follows:
1. Appearance strain: The cutting abrasive grains are found in the iron spectrum, and the abrasive grains are non-ferrous metals.
2, the external appearance of the journal: There are iron-based cutting abrasive black oxide particles in the iron spectrum, and there is tempering color on the metal surface.
3, the outer surface of the journal corrosion: spectral analysis found that the concentration of iron is abnormal, the iron spectrum has many iron submicron particles, smooth oil moisture overrun or acid value overrun.
4, tile surface corrosion: spectral analysis found that the concentration of non-ferrous metal elements is abnormal, the iron spectrum presents a number of non-ferrous metal components of sub-micron wear particles, smooth oil moisture overrun, acid value overrun.
5, fretting wear on the tile back: Spectral analysis found that the iron concentration is abnormal, there are many iron components in the iron spectrum sub-micron wear particles, smooth oil moisture and acid value is abnormal.
Under the condition of smooth liquid, the sliding surface is separated by smooth oil without direct touch, and the collision loss and appearance wear can be greatly reduced. The oil film also has a certain vibration absorption ability.

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