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Abnormal causes needle bearing surfaces off
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| Time：2016.09.07 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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Move the bearing surface of the material as part of the same scales fall off, a phenomenon known as fatigue spalling. Move during operation of the bearing to withstand a certain load, even if the static load, but the balls and raceways, its stress is reincarnation reciprocating, the material will occur to move so that the bearing fatigue life is reached. There are also several different definitions of bearing "life", one of the so-called "working life", which represents the actual life of a needle bearing before damage can be achieved by wear, damage is usually not caused by fatigue, but caused by the wear and tear, erosion, damage to seals and other reasons.
Yet no matter in laboratory tests or in actual use, can be significant to see that look in the same working premise is the same bearing, the actual life different.
Lifetime number of revolutions (in hours or work at a certain speed number) of the bearing, Definition: needle roller bearings within this life, should occur preliminary fatigue damage (flaking or chipping) any bearing on their laps or move the body. Most of the reasons a lot of bad pump bearing - beyond the original estimate of the load, non-effectively sealed tight with the resulting bearing clearance is too small and so on.
Any one of these factors have their specific factors and the type of damage will leave special signs of damage. Therefore, viewing damage the bearings, in most cases can be found in the possible guide because, generally speaking, one-third of the guide needle bearing damage due to fatigue damage, one-third of the additional inducements to poor lubrication, other inducements to one-third of contaminants into the bearing installation or improper handling.
However, these types of damage and also other related industries. For example, the pulp and paper industry, mostly because of pollution caused by poor lubrication or bearing damage caused by fatigue and not because of the material.
Large metal noise
Reason 1: Abnormal load responses: Correction with research bearing clearance, load adjustment and correction block housing shoulder position.
Reason 2: Install the adverse responses: shaft, housing machining accuracy, improve the accuracy of installation, the installation method.
Reason 3: lack of lubricant or unsuitable responses: lubricant added, select the appropriate lubricant.
Reason 4: rotating parts in contact, Countermeasures: Modify the labyrinth seal contact portions.
Noise Rules
Reason 1: Because the foreign body causing the rolling surface indentation, rust or scratches, countermeasures: replacement of bearings, cleaning related parts, improve sealing device, use a clean lubricant.
Cause 2 :( steel after carburizing) surface deformation, countermeasures: replacement of bearings, pay attention to their use.
Reason 3: raceway stripping, countermeasures: replacement of needle roller bearings.
Irregular noise
Reason 1: The clearance is too large, Countermeasures: A study with the bearing clearance and modify pre-load.
Reason 2: foreign invasion, Countermeasures: A study replacement of bearings, cleaning related parts, improve sealing device, use a clean lubricant.
Reason 3: Spherical injury, stripping, countermeasures: replacement bearings.
Abnormal temperature rise
Reason 1: too much lubricant, Countermeasures: reduce lubricant, used in moderation, choose a hard grease.
Reason 2: The lack of lubricant or unsuitable responses: lubricant added, select the appropriate lubricant.
Reason 3: Abnormal load responses: with modification, the bearing clearance studies, preload adjust, modify the location of the shoulder block housing.
Reason 4: Install adverse responses: improving machining accuracy of shaft and housing, accuracy of installation, the installation method.
Reason 5: The mating surface creep, seal friction is too large, countermeasures: replacement of needle roller bearings, with the study, modify, shaft and housing, change seals form.
Large vibration (shaft beating)
:( 1 reason carburizing steel rear) surface deformation responses: note bearing replacement operation.
Reason 2: Peel, countermeasures: replacement bearings.
Reason 3: Install poor Strategies: Modify the straight angle of the shaft, the housing block at right angles to the shoulder, the side of the pad.
Reason 4: foreign invasion, countermeasures: replacement of bearings, cleaning the parts, improve sealing devices.
Excessive lubricant leakage, discoloration
Cause: too much lubricant, dust and debris, wear powder produced foreign matter Countermeasures: the right amount of lubricant, choose to replace the lubricant change research, research needle bearing, clean housing.
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