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Method to find out the working condition data of failed bearings

by:JNSN     2021-12-22
Due to the need to find out the cause of the damage to the bearing and avoid future failures, the bearing should be taken out of the equipment. In order to obtain the most reliable results, the following procedures can be adopted when storing and inspecting bearings. In this way, when inspecting bearings removed from equipment preventive maintenance, the following points should be considered. Suggested inspection sequence: Check the working condition data, evaluate the records and graphs obtained from the bearing monitoring equipment, extract the lubricant sample, check the bearing environment to obtain external influences and other destructive factors, evaluate the bearing mark in the installation state, and remove the bearing. Mark the bearings and components, check the mating surfaces of the bearings, evaluate the complete set of bearings, check individual bearing parts or send them to. If the selected process is not suitable, the important data needed to find the cause of the bearing failure may be lost forever. When the method of protecting a failed bearing is improper, the failure mode will be masked or at least the true cause of the bearing failure will be difficult to find. Find out the working condition data When the rolling bearing fails, it is necessary to check not only the bearing itself, but also the use environment and application conditions in advance (check the assembly drawing if possible). Application background: equipment, bearing position, actual working life, how many similar equipment and how many bearings fail in these equipment Bearing structure: positioning bearing, floating bearing, floating bearing arrangement adjustable bearing (elastic preload, rigid preload; with spacer Ring, through the installation of gaskets) Speed: constant, variable (inner ring and outer ring) acceleration, deceleration or hysteresis load: axial/radial, combined load, overturning moment constant, variable (mixed) oscillation (acceleration) , Amplitude) Centrifugal force point load, circumferential load (which ring rotates?) Fitting parts: shaft mating surface, bearing seat mating surface (fitting condition) fasteners (for example: lock nut type, elastic bolt, etc.). Environmental conditions: external high temperature, low temperature special media (such as: oxygen, vacuum, radiation) static vibration dust, dirt, moisture, corrosive media, electric field or magnetic field lubrication: lubricant, lubricant supply lubricant for the last relubrication cycle relubrication Date/Last oil change date Sealed contact type, non-contact type damage bearing background: first installation or replacement of bearing bearing position change so far failure frequency calculated L10 life generally achievable life so far, operation The characteristics of the period during the maintenance of other machine parts (structure measurement, welding) equipment failure caused by other machine parts (such as seal damage, lubricating oil leakage), the transportation distance and transportation method of the equipment or bearing, if there is bearing monitoring equipment, come from Monitoring records and charts of bearing monitoring equipment.
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