Acoumeter in operation checking bearing size and sound quality of the operation, bearings even with minor injuries such as split, also is making an abnormal sound and irregular sound, using the measuring apparatus can tell. Using the auditory identification of irregular operation is a very common method. For example: detected with electronic stethoscope a part of the abnormal noise is often used by experienced operators.
Large metal noise causes
1: abnormal load responses: amendments to meet, study on bearing clearance, adjustment and load, amended casing abutment.
Cause 2: install bad responses: axis, machining precision of the shell, improved precision, installation method.
Cause 3: not enough lubricant or appropriate actions: additional lubricant, select appropriate lubricants.
Reason 4: contact rotating parts, countermeasures: modifying the contact part of the curved path.
Rules for noise reasons
1: scrolling surface indentation, corrosion due to foreign bodies or injuries, responses: replacement of bearings, wash the parts, improved sealing device, use clean lubricant. Cause 2 (steel after carburizing) surface deformation, responses: replacement of bearings, their use. Cause 3: split of Raceway surface, responses: replacement of bearings.
Irregular noise
Cause 1: the clearance is too large, and countermeasures: research support and bearing clearance, modifying the amount of preload.
Cause 2: foreign body penetrated and countermeasure: study on the replacement of bearings, wash the parts, improved sealing device, use clean lubricant.
Cause 3: spherical surface injuries, split, responses: replacement of bearings.
Abnormal temperature rise
Cause 1: the lubricant too many responses: reduction of lubricant, moderate use, select hard grease.
Reason 2: not enough lubricant or appropriate actions: additional lubricant, select appropriate lubricants.
Cause 3: abnormal load responses: modified tie, research on bearing clearance, adjust the preload, modify the shell of the abutments.
Reason 4: install bad strategies: improve the precision of Machining accuracy of the shaft and housing, install, installation methods.
Reason 5: creep of the mating surfaces, sealing device too much friction, responses: replacement of bearings, research support modifying axis and the case, change the seal form.
Vibration (pulsation of the axis)
Reason 1: (steel after carburizing) surface deformation, responses: Note bearing replacement operations.
Cause 2: split strategy: replace the bearings.
Cause 3: install bad responses: modified axle, casing abutment right angle, pad side of the straight angle.
Reason 4: foreign body invasion, responses: replacement of bearings, cleaning the parts, improved sealing device.
Excessive lubricant leakage, discoloration: lubricants, powder, such as foreign bodies foreign bodies penetrated and wear, countermeasures: moderate use of lubricants, research to change the selected lubricant and study on bearing replacement, cleaning shells. If there are intermittent noise, it means that the operation might be damaged. This sound occurs when a damaged surface is rolling out, if there are contaminants in the bearing causes a sharp sibilant sound. Serious damage may produce irregular and loud noise.
Bearing damage can be detected through listening, of course, but often has the bearings must be replaced at once is not available at this time. Therefore, methods such as the use of better-such as electronic monitoring equipment (Electronic Condition Monitoring). Compared to the old method of using a stick or screw screwdriver arrived on the bearing box and the other end to put ears, new invention can ensure safer, more accurate estimates of bearing condition.



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