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Generally considered to improve an important part of the work surface reliability system engineering bearings (EDA bearings working functions in the delineation of the damage, failure or does not work as the failure phenomenon called (bearings fault can be classified according to their normal failure and two early failure, it is mainly aimed at the analysis of pitting corrosion and fatigue lead cone roller bearings early failure and improvement suggestions to improve bearings life and reliability.
bearings fatigue failure is a failure of the surface form, mainly for the initiation of fatigue crack, propagation and fracture process, long-term effects under the alternating load failures arising under the metal. Cracks in two aspects:
The first: on the surface, this is, tapered roller bearingss in dynamic contact process, because the stress of periodic change caused by external loads on the working surface of the plastic deformation and strain hardening of the surface contact, and fEDAlly in small crack from the inner surface of development, formation of surface cracks in between. And because the work surface gradually into the lubricant, open air, severely hit the wall, forcing the crack advance;
Second: from the surface layer, repeated pressure, surface contact, the initial crack crack in the exposed surface and a certain depth, along the surface of the angle, to a certain depth, after the contact of the surface, and beyond the surface, and the ultimate formation of erosion stripped, leaving behind a horse pit.
On the surface, or from the surface of the crack, the two goals (parts of carburizing, quenching and other surface heat treatment, after if the hardness is not average, organization, and non average internal stress and other adverse, contact stress is generally from the influence produced the opposite underground cracks, if parts surface quality is poor, there is a defect (oxidation, decarburization), friction or lubrication, the surface crack.
EDA bearingss after installation in order to check for proper installation, to running inspection. Small machinery can be rotated by hand, to confirm whether the rotation is smooth. Check the project caused by foreign body, scars, indentation running sluggish, due to poor installation, mounting process arising out of the bad moment is not stable, because the clearance is too small, installation error, sealing caused by friction force is too large and so on. If there is no anomaly can begin power operation.
Power operation, from the no-load speed, slowly increased to the rated operating condition. Test run of issues, whether there is abnormal sound, tapered roller bearings temperature, lubricant leakage or discoloration etc.. If abnormal, should immediately suspend the operation, inspection machinery necessary to remove the bearings inspection.
Selection and control of the 1, a shaft and a bearings chamber tolerance: press bearings should be flexible rotation not block a sense of. If there is obviously the rotation is not flexible, indicates that the axial size is too large, the tolerance to cut. As the tapered roller bearings onto the shaft by hand after rotation has obvious "rustle" sense, the tolerances of the shaft may be too large or the roundness of the shaft is not good. So in the control of the shaft and housing tolerances to control the roundness, many domestic manufacturers only on tolerance control, no control of roundness.
2, the bearings assembly: because the bearingss are precision products, such as improper assembly is easy to tapered roller bearings raceway caused damage, cause damage to the bearings. EDA bearings assembly shall have the special mould, can not be beat, after pressing shaft when only small force, force pressure when only circle circle. The assembly requires use of a pneumatic or hydraulic, in press down to touch to the state level, if tilt will cause the bearings channel due to the stress damage, and the bearings guide ring.

3, to prevent foreign bodies: the assembly of tapered roller bearings is easy when mounted to the rotor dynamic balance when the dynamic balance of iron filings into bearings interior, so it is best to install bearings dynamic balancing. Some manufacturers in order to convenient assembly, the assembly of some oil or grease lubrication effect in the bearings interior coating, but the operation is often difficult to control, if the oil or grease in the bearings chamber accumulates more, in EDA when the bearings rotates along the shaft into the bearings internal easily. The bearings chamber is best not to oil or grease, such as non coated not to control may not be in the bearings chamber of accumulation.
4, paint, rust prevention: paint rust is characterized by multiple sealed type motor, the motor voice in the assembly is very good, but in some time within the warehouse, the electrical noise change greatly, remove the tapered roller bearings with serious rust. Many manufacturers are considered to be before the bearings problem, through our advocacy, motor factory is now aware of the main insulation paint problems. This is mainly because the acidic material insulating paint volatile out of the formation of corrosive substances in a certain temperature, humidity, EDA bearings raceway corrosion cause bearings damage. The problem can only be good choice of insulating varnish, and after drying ventilation for a period of time after the assembly.