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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>The cause and failure of FAG bearing failure The cause of failure of FAG bearings and the field of use
Causes failure of FAG bearings /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
According to the FAG bearing mission surface grinding mechanism of the enthalpy layer; the important factors affecting the grinding enthalpy layer are the effect of grinding heat and grinding force. Above we will analyze the reasons for FAG bearing failure.
Grinding heat of FAG bearings
In the grinding process of FAG bearings; in the touch zone of the grinding wheel and workpiece; consume a small amount of energy; attack a small amount of grinding heat; some transient low temperatures constituting the grinding zone. Such transient low temperature; surface sufficient for the mission surface to have a certain depth Layers of low temperature oxidation; amorphous arrangement, low temperature tempering, secondary quenching; and even burn cracking and other changes. Use linear stop heat source heat transfer theory formula to derive, plan or use red inner line method and thermocouple method to test the experiment The instantaneous temperature under the condition; the instantaneous temperature in the grinding zone can be as high as 1000~1500 °C in the range of 0.1 to 0.001 ms.
(3) Low temperature tempering layer (1) Surface oxide layer. 2) Amorphous arrangement layer The instantaneous low temperature of the grinding zone causes the surface of the workpiece to reach the molten state; the molten metal molecular flow is uniformly applied to the mission surface; It is cooled by the base metal at a very fast rate; it constitutes a very thin layer of amorphous arrangement. It has high hardness and resistance; but it only needs about 10nm; it is easy to be removed in precision grinding.
The effect of oxygen on the steel surface and air in the transient low temperature effect; the thin layer of iron oxide rising to the pole. 20~30nm). It is worth noting that the thickness of the oxide layer is in contact with the total thickness of the surface grinding enthalpy layer. This explains that the thickness of the oxide layer is directly related to the grinding process; it is an important symbol of the quality of grinding.
The instantaneous low temperature in the grinding zone can be heated to a temperature higher than the tempering temperature of the workpiece at a certain depth (10 to 100 nm). The higher the heating temperature, the more the hardness decreases. The case where the austenitizing temperature is not reached Down; followed by the advancement of the heated temperature; its surface layer by layer and the heating temperature should be absolutely tempered or low temperature tempering arrangements; hardness also decreased.
FAG bearing field of use
Since 2001, FAG has become a part of Schaeffler's collective; it has played a positive and important role in the collective aerospace, automotive and industrial sectors. It covers everything in the consumption of machinery, power transmission and railways, heavy industry and the consumption of occupations. The field of use. Combined with the INA product; FAG has the most thorough product outline in the rolling bearing profession.
　
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Source: China Bearing Network Time: 2013-12-22