There are strong metal noise, abnormal sound, irregular sound and other abnormalities. The reasons for poor lubrication, poor precision shaft or bearing, bearing damage, invasion of foreign bodies. NSK angular contact ball bearing rotation sound with a stethoscope and other checks.
Many users there is such a problem NSK angular contact ball bearing device is not in check after this lead to NSK angular contact ball bearings in the operation of a problem. Then NSK angular contact ball bearings running check what matters?
In order to check the device is correct, NSK angular contact ball bearing device after the end. To run the check. Small machinery can be rotated by hand to confirm whether the rotation is smooth. Inspection items due to foreign body, scars, indentation caused by poor operation, due to poor installation, poor processing device seat torque instability, due to clearance is too small, the device error, the friction caused by excessive torque Wait. If there is no abnormality you can start the power running.
Therefore, no-load power immediately cut off after power, large-scale machinery can not be manually rotated. Mechanical idle, check for vibration, noise, rotating parts have contact, etc., to confirm no abnormalities, into the power running.
Starting from no load low speed, power running. Gradually increase to the rated conditions of the rated operation. Test run to check whether there is abnormal sound, bearing temperature changes, lubricant leakage or discoloration and so on. If abnormal, should immediately stop running, check the machine, if necessary, remove the bearing inspection.
Generally based on the external temperature of the housing estimated. However, the direct use of oil hole bearing outer ring temperature measurement more accurate. Bearing temperature, NSK angular contact ball bearing temperature. Gradually increased from the beginning of operation, usually 1 to 2 hours after the temperature stability. If the bearing device is not good, the temperature will rise sharply, with abnormally high temperature. The reasons, such as excessive lubricant, bearing clearance is too small, poor equipment, sealing device friction is too large. High-speed rotation of the place, the bearing structure, the choice of lubrication error is also the reason.