Title

REVERSING MILL – SQUEEZE FILM – 7475-KL BEARING

REVERSING MILL – SQUEEZE FILM – 7475-KL BEARING

Authorship

B. CAPARROTTI, SAMUEL; E. SIMMONS, TOM

B. CAPARROTTI, SAMUEL

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E. SIMMONS, TOM

I am this author

DOI

10.5151/2594-5297-LA3298-11842

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Abstract

It is common knowledge that when the rotational speed of an oil film bearing goes to zero, the oil film also goes to zero. So, how is it possible for a reversing mill to reverse? And yet. there are hundreds of roughing mills, plate mills and steckel mills that reverse without ,harm to the bearings or damage to the mill. When the beanng goes from operating speed to zero speed in a very short time, the oil film doesn't instantly go to zero. The oil trapped between the journal and bearing is squeezed out around the journal, which takes time. This is how reversing mills equipped with DanOil bearings can reverse without hydrostatic assist. Hydrostatic assist is a system that supplies high-pressure oil to the bearings at zero speed that maintains an oil film. It is a very expensive addition to the mill that is unnecessary on reversing mills, plate mills and steckel mills. This paper presents a method for predicting how long a mill can remain stationary before reversing without damage to the bearing. This is known as 'squeeze film analysis'.

It is common knowledge that when the rotational speed of an oil film bearing goes to zero, the oil film also goes to zero. So, how is it possible for a reversing mill to reverse? And yet. there are hundreds of roughing mills, plate mills and steckel mills that reverse without ,harm to the bearings or damage to the mill. When the beanng goes from operating speed to zero speed in a very short time, the oil film doesn't instantly go to zero. The oil trapped between the journal and bearing is squeezed out around the journal, which takes time. This is how reversing mills equipped with DanOil bearings can reverse without hydrostatic assist. Hydrostatic assist is a system that supplies high-pressure oil to the bearings at zero speed that maintains an oil film. It is a very expensive addition to the mill that is unnecessary on reversing mills, plate mills and steckel mills. This paper presents a method for predicting how long a mill can remain stationary before reversing without damage to the bearing. This is known as 'squeeze film analysis'.

Keywords

reversing mill; oil film bearing; squeeze film; hydrostatic assist; DanOil

reversing mill; oil film bearing; squeeze film; hydrostatic assist; DanOil