NSK Americas

Spherical roller bearings used in guide rolls of continuous casting machines operate under extremely severe conditions and suffer from wear that would not normally occur under most other operating conditions. Heavy loads at ultra-low speeds. Debris and water contamination. Roll bending stress. All of the ingredients for a short bearing life. In the worst cases, bearing fracture. With extreme durability and core toughness, NSK SWR™ Spherical Roller Bearings are engineered to deliver superior resistance to wear and the onset of progressive bearing damage - promoting longer operating life and reducing unplanned maintenance downtime.

While contending with high heat, heavy loads, low speed and water exposure, the bearings used in continuous casting machinery must operate with reliability to ensure that yield, productivity, and cost-efficiency is maximized. NSK’s new NUB series cylindrical roller bearings are designed to be particularly effective for the free end of strand guide rolls, accommodating roll shaft bending and expansion while running with reduced sliding friction and wear for a longer, reliable operating life.

PROVEN ADVANTAGES

› Extended operating life – as much as 3 times that of alternative solutions

› Reduced internal differential sliding friction and wear › Accommodates roll shaft bending / misalignment

› Smoothly absorbs roll expansion resulting from high operating temperatures

› Easy installation with non-separable design

Four-row tapered roller bearings are engineered to withstand the heavy and impact loads transmitted - radially and axially - as passing steel is reduced in thickness by the work rolls in rolling mill stands. They must also accommodate wide speed variations including rapid acceleration and decelerations. But arguably the most arduous challenges faced by these bearings are environmental: not only high temperatures, but also contending with mill scale contamination and water ingress.

NSK Extra-Capacity Sealed-Clean Tapered Roller Bearings are manufactured with long-life Super-TF steel to deliver significantly higher durability and wear resistance in contaminated lubrication conditions. And for utmost reliability and operating life amid aggressive environments, NSK’s Sealed-Clean design offers improved heat- and water-resistant sealing protection, promoting reduced grease consumption and reduced maintenance costs.

 

NSK four-row cylindrical bearings are engineered specifically to accommodate the extremely heavy and impact loads - while running smoothly and accurately - in the back-up rolls of rolling mill stands. Amid particularly harsh operating conditions, NSK’s long-life Super-TF steel provides significantly higher durability to counteract the heavy rolling load and the high probability of compromised bearing lubrication. Available in a large range of design types with high-performance cage options, and manufactured to precision tolerances, NSK four-row cylindrical bearings are optimized to deliver high capacity and high accuracy for uninterrupted and precise rolling.

From the outset, NSK performs an exhaustive damage analysis to evaluate a bearing’s potential for successful reconditioning and to identify root causes of damage in order to assist our customers with implementing corrective or preventative maintenance measures. Successfully reconditioned bearings can be returned to service, or into critical-spare inventory, thereby:

• Extending the life of the bearing
• Reducing replacement costs
• Eliminating long lead times
• Optimizing inventory utilization