NSK bearing operation inspection

NSK Bearings After installation, in order to check for proper installation, operation to be checked. Small machines can be manually rotated to confirm rotate smoothly. Check the items are dysfunctional because nick, indentation caused due to poor installation, poor mount processing and torque generated unstable moment due to clearance is too small, installation error, seal friction caused by too large and so on. If no abnormal power operation can begin.

Large machinery can not be rotated manually, so the load starts immediately after the power cut, machine idling, check for vibration, noise, whether there is contact with rotating parts, etc., after confirming that no abnormalities into power operation.

Power operation, start from no-load low speed, slowly increased to a predetermined nominal operating conditions. Check for commissioning items, whether there are abnormal sound, bearing temperature, lubricant leakage or discoloration like. If abnormal, should immediately suspend the operation, inspection machinery, if necessary, to remove the bearing inspection.

Bearing temperature, and can speculate based on external temperature bearing. However, the use of direct measurement of the bearing outer ring hole temperature is more accurate. Bearing temperature gradually increased from the start of the operation, the temperature is usually 1 to 2 hours after stabilization. If the bearing mounting bad, the temperature will soar, abnormal high temperature. The reason for such excessive lubricant, bearing clearance is too small, poor installation, seal friction and too big. High-speed rotation of the occasion, bearing structure, lubrication and so is the choice of the wrong reasons.

Turn the sound of the bearing with a stethoscope and other tests, there is a strong metal noise, different sound, tone, etc. Exceptions irregular. The reasons are poor lubrication, shaft or bearing bad precision, bearing damage, foreign invasion and so on.