Operation of TIMKEN needle bearing inspection method for noise

TIMKEN bearings after 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, needle roller 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 bearing inspection. TIMKEN bearing temperature, average according to the external temperature of the bearing. But using the oil hole directly measuring the temperature of the needle roller bearing outer ring more accurate. The bearing temperature, starting operation gradually increases, usually 1 ~ 2 hours after the temperature stability. If the bearing installation, the temperature will rise sharply, abnormal high temperature. The reason such as lubricant, bearing clearance is too small, too much bad installation, excessive friction sealing device, etc. High-speed rotation, the choice of the ways of bearing structure, the lubrication error and so on is also the reason. TIMKEN 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 precision bearing, bearing damage, foreign body intrusion, etc. Due to the size of the diameter of axle and bearing hole measurement inaccuracy or cooperate with surface roughness, do not meet the standard requirements to cause excessive interference fit, the bearing race is being squeezed from a large, thus reduce the radial clearance of the bearing itself, difficult to rotate the needle roller bearing, fever, wear or jammed, caused serious bearing inner and outer race in cracking during installation. This noise because the bearing design or manufacturing error. It is mainly composed of the following three kinds of noise. Channel noise it is well known that even the most sophisticated machining technology to use the channel ( Or roll) And roller surface, also can't make absolute ideal circle, on the surface of the channel and there is always arbitrary small roller surface shape error, the error on the macro performance for form error, waviness and roughness on the micro. Vibration produced by the waviness and roughness includes a series of random pulse, when the TIMKEN bearing rotation, the pulse will cause bearing noise channel noise that constitutes the main ingredients of needle bearing noise. Strict control of ring and roller roundness, roughness and waviness and machining precision of the rolling body, this will significantly reduce the channel noise.