The cause of the failure cause FAG bearing

According to FAG bearing grinding metamorphosis of layer task appearance formation mechanism, the influence of the important factors of grinding metamorphosis is grinding heat and grinding force. It's a to analyze the cause of the failure to FAG bearing.

FAG bearing grinding heat

In the import bearings FAG in grinding process, grinding wheel and the contact area, and a small amount of consumption can, happen a small amount of grinding heat, form part of the grinding and third low temperature. So when the brake low temperature, enough to make sure the task appearance depth surface temperature oxidation happens, amorphous organization, low temperature tempering, secondary quenching, even burn cracking and so on many kinds of changes. Application linear static heat source heat transfer formula, willing or practice application red insider method and thermocouple measurement method to test conditions when the brake temperature, can be invented in 0.1 ~ 0.001 in the brake ms grinding temperature when the 1000 ~ 1500 ℃ can be as high as.

When the brake grinding low temperature to make the work to melting appearance of molten metal molecules flow and were equally apply to a task appearance, and metal matrix at tremendous speed cooling, formed a very thin layer of the amorphous organization layer. It has high hardness and toughness, but it as long as 10 nm around very easily on the fine in grinding process has been removed.

And third low temperature under the action of steel appearance with the oxygen in air role, rise into the very thin (20 ~ 30 nm) iron oxide thin layer. Notable is oxidation layer thickness and outward appearance grinding metamorphosis layer always thickness test is a consequence of the corresponding relation. This explains the oxidation layer thickness and grinding process indirect coherent, is an important mark of grinding quality.

When the brake grinding low temperature can make sure appearance depth (10 to 100 nm) in higher than to the heating temperature of heating the tempering. The higher the temperature of heat, hardness landing and more fierce. In did not arrive at austenitic transition temperature of the state, as the heating temperature of progress, its appearance will occur and step by step heating temperature should be absolutely the tempering or low temperature of tempering again organizational change, hardness is then landing.
 
 
 



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