Backup Roll Bearing
Backup roll bearings are typically cylindrical roller bearings for multi-roll mill backup rolls, with extra-thick outer rings and handled in group per shaft. They specifically designed for Sendzimir mills in Iron and Steelworks. Due to the optimized seal design these bearings achieve long life under high-speed and bad working conditions.
There are the following types of backup roll bearings:
1. Double row cylindrical roller bearing with brass cage: with seals, without seals, with locating ring, without locating ring;
2. Three-row cylindrical roller bearing with brass cage: with seals, without seals, with locating ring, without locating ring;
3. Double row full complement cylindrical roller bearing without cage;
4. Three-row full complement cylindrical roller bearing without cage;
Full complement cylindrical roller bearings have the maximum possible number of rollers, they have an extremely high load carrying capacity and are suitable for compact design, but do not proper in high speeds applications due to the absence of a cage.
Backup roll bearing features:
High load capacity: with the thick-walled outer ring.
Low friction: The optimized internal design reduces friction and heat increasing generated by the bearing rotating.
Effective lubrication
Backup roll bearings usually have lubrication holes and have one or more annular grooves in the inner ring to enable lubrication via the support shaft.
Long service life: The logarithmic profiling of their rollers and raceway reduces edge stresses at the contact surface under all load conditions. It will help to improve the bearing’s service life.
There are two ways of lubrication for the bearings for multi-row mill backup rolls:
1.Oil mist lubrication:
Improving bearing service life(2-fold or better compared to conventional types)
High sealing performance
Oil-seals space-saving size for simple installation or removal
2. Forced oil lubrication:
Outer ring with both high rigidity and durability realized
High resistance to fatigue realized owing to the superior material composition
Design optimized to match the surrounding structure
Tedin’s Advantages:
1. Self-developed roller production line:
Roller generatrix is modified by the logarithmic curve.
Reduce the stress concentration at the edge of the roller.
Increase bearing service life.
Precise control of roller roundness and contour.
Roller accuracy can reach to Grade 1.
Group diameter variation: 0.001mm;
Outer diameter waviness: 0.00015;
Contour deviation: 0.0015mm;
Hardness: HRC 61-64;
2. Bearing outer ring with double ribs: Effectively withstand axial force.
3. With special design of cage structure.
4. High purity raw material: imported row material TIMKEN steel, OVAKO steel, BAOSHAN special steel, etc.
Our Service:
Design, calculate, and analyze working conditions, and offer you a better solution.
All bearings will be delivered with a material certificate, heat-treatment report of hardness and Metallographic detection, samples for test, NDT report, final test report, etc.
The backup roll bearings are typically used for the steel industry, the inner ring which mounted through the rolls are much easier to wear out. We also supply inner rings to replace work.
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