Design of bearing arrangements
Roll neck requirements
In most rolling mill applications four-row tapered roller bearings are mounted with a loose fit on the roll neck. The roll neck journal and the axial abutment for the inner rings must have a certain minimum hardness. The recommended hardness is
- 45 Shore (≈ 34 HRC) for the roll neck surface and
- 60 Shore (≈ 45 HRC) for the axial abutments for the inner rings.
Axial location of inner rings on the roll neck
The inner rings must not be axially clamped. There must remain a total clearance between the bearing rings and their abutments of 0,2 to 1,3 mm (fig 1).