Bearing failure modes: normal fatigue spalling and wear

There are two main types of normal failure mode of the bearing - - Fatigue spalling and wear. ( A) Bearing normal fatigue failure of bearing in the total number of hours of operation or after the calculation of bearing life the total number of turns, the fatigue spalling of normal fatigue failure. Causes for the failure of normal is rolling on the surface of the metal due to the stress cycle in the operation of more than the fatigue limit of material, starting from the subsurface initiation of fatigue crack, and fall in metal debris - to the surface cracking - - Peeling off. Normal fatigue failure of features: the fatigue crack initiation in subsurface, invisible, using ordinary instrument can't listen to. Peeling off of the surface of the chip is rough and irregular, the original shape of the rolling surface scars small pit, known as pitting. The pitting once appear, expanded rapidly, in a short period of time which cause fatigue spalling, appropriate replacement bearing as early as possible, otherwise will cause bearing to accident scrap, may to install parts and even serious consequences for the whole machine. More than life of fatigue spalling, actually is inevitable end inevitable phenomenon, has been making full use of the material. Such as user requirements in working life is still not satisfied, can be added to add to the bearing lubricant suitable extreme pressure additives, to switch to higher or larger size bearing performance, or use vacuum smelting, vacuum heavy chains, etc for many times of bearing steel. ( 2) Bearing the normal wear failure of bearing in the total number of hours of operation or total revolutions over the calculation of bearing life, or excessive wear, after more than wear life for normal wear failure. Reason is: the movement of the rolling bearing are accompanied by tiny slide, there is also always some volatility by load, wear and lubrication can delay but it can't be avoided two solid contact interface, which can not completely avoid wear and tear. It showed the character is: the rolling surface along the direction of movement occurred relatively smooth wear stripes, new stripe has the significant metallic luster. Normal wear of rolling bearing has three phases, namely the short-term 'running-in wear, gentle and wear long and short-term severe wear, eventually make the precision of the bearing is lost, or cause vibration and noise and cannot continue to use. More than rated life or wear life of the wear failure, under the condition of existing technology in fact also is inevitable. Such as user requirements in working life is still not satisfied, can improve bearing lubrication method, and the use of more effective lubricant, or according to the specific circumstances add appropriate oily additives or anti-wear additives, improve the bearing and the clean degree of lubricant, improved sealing, etc. 'normal failure form of the rolling bearing, such as take measures, there is still a great increase in full scope to the service life of bearing.