Spherical roller bearings for tough environments

First Quarter 2022 Shaft power components

Unforeseen bearing failures in production-critical machines and equipment can prove extremely costly in replacement parts, labour and downtime. This problem becomes worse in contaminated environments such as in steel manufacturing and increasing numbers of steel plants are turning to the advantages offered by NSK’s long-life Super-TF spherical roller bearings. Manufactured from a specially developed, proprietary material, these bearings increase service life and uptime significantly. They are ideal for very high load applications and have a proven ability to reduce surface-originated flaking from contaminated lubricant.

In the steel industry metal particles or debris can easily contaminate bearing lubrication. These contaminants create dents in the rolling surfaces of bearings, where stress concentrated around these dents eventually leads to cracking and surface flaking. NSK’s Super-TF bearing steel offers impressive service life. In 2017, the test house DNV GL certified that when Super-TF material is used, the basic dynamic load rating in roller bearings is improved by 23%. This equates to an effective doubling of fatigue life in comparison with bearings made from standard steel.

A steel manufacturer was experiencing bearing failures on its cold rolling mill every three to four months. NSK engineers analysed the failed bearings and grease samples, discovering that the rolling mill’s highly contaminated operating conditions were behind the unexpected bearing failures. After four months an X-ray fatigue analysis revealed a residual life of 29 to 50 months, thanks to the superior wear resistance of Super-TF bearings.

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