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A UK steel manufacturer experienced frequent failures of the bearings in a diverter roll. Unplanned bearing failures often caused the diverter rolls to be scrapped. As a consequence of the seized bearing the product was scored requiring rework or rejection. NSK engineers worked together with the distributor to identify that a change of service caused larger heat transfer to the spherical roller bearings which resulted in degradation of the grease and bearing failure. NSK suggested to use a larger clearance bearing and a high temperature lubrication. As a result the bearing life increased to more than 12 months.

Cold Rolling Mill
  • Cold Rolling Mill
NSKHPS Spherical Roller Bearing
  • NSKHPS Spherical Roller Bearing

Key Facts

  • Rail rolling mill with a very short bearing life <2 months, failure damaging endproduct
  • Heat transfer caused lubricant degradation
  • Reduction in clearance and poor lubricant caused seizure
  • NSK reviewed the application and the failed competitor bearings
  • NSK Solution: Spherical roller bearing with larger clearance and higher temperature capable lubricant
  • Bearing life increasing to more than 12 months

Value Proposals

  • NSK engineering inspected the application and the bearings to find the root cause of failure
  • Suggested to use larger clearance bearings and a high temperature lubricant
  • As a result the bearing life was increased to more than 12 months

Product Features

  • Highest load rating Spherical Roller Bearings
  • Optimum raceway design & surface finishing
  • High cleanliness steel
  • Temperature stability: up to 200° C
  • 40 mm to 260 mm bore size
Cost Saving Breakdown
Before Cost p.a. NSK Solution Cost p.a.
Bearing Costs € 1 635 Bearing Costs € 134
Engineering Costs € 908 Engineering Costs € 0
Costs of lost production € 45 420 Costs of lost production € 0
Lubrication Costs € 5 678 Lubrication Costs € 11
Other Costs: New rollers and reworking product € 29 749 Other Costs: New roller € 933
Total Costs € 83 390 € 1 079