NTN bearing inspection analysis - bearing knowledge after operation

After the NTN bearing installation, in order to check whether installed correctly, check for running. Small mechanical can rotate with the hand, to confirm whether to rotate smoothly. Check project has caused by foreign bodies, scars, creasing seized up, due to bad installation, installation of seat processing bad moment is not stable, because the clearance is too small, installation error, seal friction caused by the torque is too big, and so on. If there is no abnormal can start power operation. Large machinery from manual rotation, so after no-load start immediately cut off the power, machine idle, check whether there is presence of vibration, noise, rotating parts contact, etc. , confirmed after no abnormalities, into power operation. Dynamic operation, from the beginning of the no-load speed, slowly up to the rated operating conditions. Test run to check the items, whether there is abnormal sound, NTN bearing temperature, lubricant leakage or discoloration, and so on. If discovery is unusual, should immediately stop, check machine, when it is necessary to remove the NTN bearing inspection. NTN bearing temperature, general according to NTN bearing the external temperature of speculation. But using the oil hole directly measuring the temperature of the NTN bearing outer ring more accurate. NTN bearing temperature, from the beginning of the work gradually rise, usually 1 ~ 2 hours after the temperature stability. If bad NTN bearing installation, the temperature will rise sharply, abnormal high temperature. The reason such as lubricant, NTN bearing clearance is too small, too much bad installation, sealing device too much friction, etc. High-speed rotation, NTN bearing structure, selection of lubrication method error is also the reason. NTN bearing examination such as the rotation of the sound with a stethoscope, a strong metal noise, such as vision, irregular note that exception. Its reason has poor lubrication, shaft or NTN bearing bad precision, NTN bearing damage, foreign body intrusion, etc.