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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>The field of use of FAG bearings and the cause of failure The field of use of FAG bearings and the cause of failure
The field of FAG bearing has been used since 2001; FAG has become a part of Schaeffler's collective; and has played a positive and important role in the collective aerospace, automotive and industrial fields. In conjunction with INA products; FAG has the same occupation in the rolling bearing profession The most thorough product outline covers all areas of use in the consumption of machinery, power transmission and railways, heavy industry and the occupation of occupations. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The cause of FAG bearing failure is based on the formation mechanism of the surface grinding of the FAG bearing mission surface; the important factors affecting the grinding of the enthalpy layer are the effect of grinding heat and grinding force. Let us analyze the cause of FAG bearing failure. .
1. The grinding heat of FAG bearings is in the grinding process of FAG bearings; the grinding wheel and the touch area of ​​the workpiece; the consumption of a small amount of energy; the occurrence of a small amount of grinding heat; the formation of the grinding zone with some transient low temperature. The use of linear stop heat source heat transfer Theoretical formula derivation, planning or using the red inner line method and the thermocouple method to measure the instantaneous temperature under the experimental conditions; 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. Low temperature; sufficient to cause low-temperature oxidation of the surface layer of the mission surface must be deep; amorphous arrangement, low temperature tempering, secondary quenching; and even burn cracking and other changes.
.1) The surface effect of the surface oxide layer on the surface of the steel and the oxygen in the air; the thin layer of iron oxide which is raised to the pole of 20 to 30 nm. It is worth paying attention to the thickness of the oxide layer and the total thickness of the surface-grinding enthalpy layer. The test results are in a corresponding relationship. 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.
.2) Amorphous arrangement of 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; and is cooled by the base metal at a very fast rate; 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.
.3) The instantaneous low temperature of the low-temperature tempering layer grinding zone can be heated to a temperature higher than the tempering heating temperature of the workpiece at a certain depth (10-100 nm). Without reaching the austenitizing temperature; The advancement of the heating temperature; the surface layer will be modified by the arrangement of the tempering or low temperature tempering of the heating temperature, and the hardness will also decrease. The higher the heating temperature, the more fierce the hardness is.
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The field of use of FAG bearings and the cause of failure
Source: China Bearing Network Time: 2018-04-21