Date: 2013-08-22

Needle roller bearings overheat Precautions

Needle roller bearings parts from rough mouth after quenching can be observed on the microstructure overheating.
But to correctly determine the extent of overheating must observe the microstructure. If the steel is quenched gcr15 appear coarse acicular martensite, was quenched overheating tissue. Formation may be due to the quenching temperature heating temperature is too high or too long causing the overall overheating; also may be due to the original organization carbon ribbon severe in the two areas with the formation of carbon between the local martensite needles thick, cause localized overheating. Overheating tissues residual austenite increases, dimension stability decreased. Since quenching overheated steel crystal thick, may cause parts of the toughness decreases, the fight against performance degradation, drawn cup needle roller bearing life is reduced. Even cause serious overheating quenching cracks.
Check the operation of the entire transit status and pre thorough inspection plan has become increasingly important. Among them, Needle roller bearings for the focus of attention because it is the most important of all transit rotating parts, preventive maintenance condition monitoring is an important part. Early detection of damage to Needle roller bearings Needle roller bearings avoid damage caused by unplanned equipment downtime.
Especially in the important machinery or harsh environments Needle roller bearings should always check that the current market has been quite a lot of systems and instruments for monitoring Needle roller bearings, most of these instruments have based on vibration measurements.
However, not all of these instruments are equipped with advanced instruments. In this case, the transit operator or maintenance engineer must Needle roller bearings "fail signal" vigilance, such as noise, temperature and vibration. "Listen," "Touch" and "observation" are the three important ways.

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