Home>Bearing knowledge>Analysis of the observations after working on NTN bearings

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Analysis of the inspection items after NTN bearing work

Source: Bearing network time: 2014-10-30

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After the NTN bearing equipment is completed; in order to check whether the equipment is correct; to check the work. The small machine can be rotated by hand; to recognize whether it can rotate smoothly. Check the project for the work caused by foreign objects, scratches and indentations; Poor equipment; 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, the power can be started.
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.; after acknowledging that there is no abnormality; 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; can there be abnormal sound, NTN bearing temperature change, smoothing agent leakage or discoloration, etc. If found Abnormal; should work intermittently; view the machine; if necessary, remove the NTN bearing to view.
NTN bearing temperature; generally can be estimated according to the external temperature of the NTN bearing housing. But the oil hole directly measures the temperature of the outer ring of the NTN bearing is more accurate. NTN bearing temperature; gradually rise from the beginning of the work; generally 1~2 hours after the temperature is stable If the NTN bearing equipment is bad; the temperature will rise sharply; abnormal temperature will occur. The reasons are such as excessive smoothing agent, too small NTN bearing clearance, poor equipment, excessive conflict of sealing equipment, etc. High-speed rotation; NTN bearing layout, The selection of the smooth method is also the reason.
The transition sound of NTN bearing is viewed with a stethoscope, etc.; there are strong metal noise, abnormal sounds, irregular sounds, etc. to clarify the abnormality. The reason is poor smoothness, poor accuracy of the shaft or NTN bearing seat, NTN bearing damage, foreign matter intrusion, etc.

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