Rolling bearing material defect, improper processing or assembling, poor lubrication, moisture and foreign matter, corrosion with B due to reasons such as early damage may result in bearing load.
, of course, even in the installation, lubrication and maintenance of normal cases, after a period of operation, the bearing will appear fatigue remaining fall and wear phenomenon, thus affecting the normal work of the machine.
Rolling bearing failure has a variety of forms, such as left to fall, pitting,
Fatigue)
Crack, fracture, sticky dirty, softening, indentation, micro vibration grooving and corrosion, etc.
One or more of the failure mechanism may play a role at the same time, thereby reducing the service life of shaft bearing.
In some cases, there may be obvious single failure mechanism, and in another case, would obviously presents several failure mechanism of composite.
When the work is not a single mechanism, correct judgment can not only need careful check of the failure parts, also need to analyze the material and the manufacture, installation, use, transport line, and so on and so forth to understand.
In view of the common failure forms of roller bearing can be classified into the following seven categories fatigue spalling, rolling bearing raceway and rolling body is under load and relative rolling, as a result of the action of alternating load in the first place at certain depth below the surface of (
Maximum shear stress)
Crack formation, and then extended to the contact surface spalling last fall to large left pit, this phenomenon is known as fatigue spalling.
In the operation of fatigue spalling can cause impact load, vibration and noise.
Under normal working conditions, the fatigue residual fall is often the main reason for the rolling bearing fault.
Habits of bearing life is refers to the bearing fatigue life.
Second, the abrasion between the bearing parts surface caused by the relative sliding metal loss phenomenon called wear constantly.
Continue to wear will make the parts size and shape change, bearing fit clearance increases, the work surface morphology change bad loss to spin fine, make the bearing cannot work normally, known as the bearing wear failure.
Wear failure is one of the most common failure forms of all kinds of bearing surface, according to the wear forms can be divided into the abrasive wear, adhesive wear and corrosive wear, micro vibration, wear and fatigue wear, etc. , one of the most common for abrasive wear and adhesive wear.
Bearing parts of the friction surface between hard particles in foreign or abrasive dust on the surface of the metal, causing friction surface wear phenomenon known as abrasive wear, it is often in the bearing surface to chisel, cut or groove type abrasion.
External hard particles often comes from the dust in the air or the impurity in the lubricant.
Adhesive wear is mainly due to the friction surface microscopic bumps or friction foreign bodies make the friction surface is uneven, local friction heat is likely to make shore facial form micro welding.
Friction surface temperature increase, will cause the lubricating film rupture, partial melting, will happen to be serious when metal surface contact adhesive, avulsion and circulation process of adhesive, adhesive wear.
Serious adhesive wear can cause friction welded and stuck below.
The wear of the bearing clearance increases as a result, the surface roughness increases, from running accuracy and reduces the bearing, and therefore reduce the overall movement of the machine precision, vibration and noise is increased
