dryer roll bearing in paper making machine

[3801093]

We have problem with dryer roll bearing in paper making machine that inner ring of the bearing cracks in very short period. We found some info that they warm up the roll by 2-4 hours.So we would like to know that if warming up period is necessary and long enough likes 4 hours.

 

[Skogsgurra]

Hello,

I am not a bearing expert. But I have been in (listened to) discussions about how to size the shaft and bearing. It is about the shaft being hollow (for the steam) and that normal design rules cannot be used because the shaft is not solid - and thus shall have a tighter fit (yields more) than a solid shaft shall have.

If this design rule is applied to a non-hollow shaft, chances are that the inner ring cracks. Or if it is applied wrongly on a hollow shaft. In such a case, the warming up period does not have much influence on the outcome.

Some SKF offices have very good guys that understand this sort of problem. But, as always, you have to find the right guy.

Gunnar Englund

http://www.gke.org

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