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EDA bearing installation is completed, in order to check for proper installation, to running inspection. Small machinery can be rotated by hand, to confirm whether the rotation is smooth. Check the project caused by foreign body, scars, indentation running sluggish, due to poor installation, mounting process arising out of the bad moment is not stable, because the clearance is too small, installation error, sealing caused by friction force is too large and so on. If there is no anomaly can begin power operation.
Large machinery can not be manually rotated, so the no-load starting immediately after power cut, mechanical idling, check whether the vibration, noise, rotating parts are in contact and so on, confirmed no abnormal, into the dynamic operation.
Power operation, from the no-load speed, slowly increased to the rated operating condition. Test run of issues, whether there is abnormal sound, needle roller bearing temperature, lubricant leakage or discoloration etc.. If abnormal, should immediately suspend the operation, inspection machine, necessary to remove the bearing inspection.
EDA bearing temperature, generally according to the external temperature of the bearing seat to speculate. However, direct measurement of needle roller bearing outer ring of the oil hole temperature more accurately. Bearing temperature, from a running start rising, usually 1~2 hours after the temperature stability. Bad if the bearings are mounted, the temperature will rise sharply, abnormal high temperature. The reason such as excessive lubricant, the bearing clearance is too small, poor installation, sealing device too much friction. High speed rotating occasions, lubrication structure, choice is also the cause of the error.
Turn tone with a stethoscope to check EDA bearing, a metallic noise, strong noise, irregular, abnormal sound. Due to poor lubrication, shaft or housing poor accuracy, bearing damage, foreign intrusion etc..
As the shaft size measuring diameter and bearing seat hole imprecise or with the surface roughness does not meet the standard requirements, resulting in excessive interference fit, so that the bearing race is very pressing, resulting in radial clearance of the bearing is reduced, the needle roller bearing rotation difficulties, fever, wear or death card, serious when can cause inner and outer race bearing cracking during installation.
This noise is because the bearing design or manufacturing process error caused by. It mainly consists of the following three kinds of noise.
Channel noise as everyone knows, even using the most sophisticated processing technology to process the channel (or race) and the surface of the rolling body, it is also impossible to make the absolute ideal round, on the channel surface and the surface of the rolling body there is always error arbitrarily small shape, the error in the performance of macro configuration error, at the micro level is shown as the waviness and roughness. The vibration produced by waviness and roughness including random pulse series, when the rotation of EDA bearing, the pulse will cause the bearing "channel noise" this noise constitutes the main component of the needle roller bearing noise. Strictly control the machining accuracy of rings and roller roundness, roughness, waviness and rolling body, this will significantly reduce the channel noise.