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Causes of FAG bearing failure
Source: China Bearing Network Time: 2013-01-18
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According to the composition of the FAG bearing work surface grinding layer; the main factors affecting the grinding of the enthalpy layer are the effect of grinding heat and grinding force. The following is a breakdown of 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; it consumes a lot of energy; a lot of grinding heat occurs; the instantaneous high temperature of the grinding zone is formed. The heat is transferred by the linear motion heat source. The theoretical formula is deduced, accounted, or the instantaneous temperature under the conditions of the infrared test and the thermocouple method; the instantaneous temperature of the grinding zone can be as high as 1000-1500 ° C in the range of 0.1 to 0. 001 ms. It is sufficient to cause high temperature oxidation of the outer surface of the work surface with a certain depth; amorphous arrangement, high temperature tempering, secondary quenching, and even burn cracking and other changes.
(1) The effect of the outer surface of the oxide layer on the appearance of oxygen in the steel and the oxygen in the air; the thin layer of iron oxide which is extremely thin (20-30 nm). It is worth noting that the thickness of the oxide layer and the surface of the entangled layer are The thickness test results are in a corresponding relationship. This indicates that the thickness of the oxide layer is directly related to the grinding process; it is an important mark of the grinding quality.
(2) The amorphous state arranges the instantaneous high temperature of the grinding zone to make the workpiece surface reach the molten state; the molten metal molecular flow is uniformly applied to the work surface; and is cooled by the base metal at a very fast speed; Very thin layer of amorphous arrangement. It has high hardness and resistance; but it only needs about 10nm; it is very simple to be removed in fine grinding.
(3) The instantaneous high temperature in the grinding zone of the high temperature tempering layer can be heated to a temperature higher than the tempering heating temperature of the workpiece at a certain depth (10 to 100 nm). In the case where the austenitizing temperature is not reached; The improvement of the heating temperature; the appearance of layer-by-layer will occur with the re-tempering or high-temperature tempering corresponding to the heating temperature; the hardness will also decrease. The higher the heating temperature, the more fierce the hardness is.
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