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Introduction

Key Facts

  • A major paper mill was experiencing multiple inner ring crack on their calendar roll 
  • Standard sphreical bearing was being used without carburized inner rings
  • 12 failures annually
  • Excessive downtime and maintenance

TL Spherical Roller Bearing TL Spherical Roller Bearing

Background Information

  • Industry: Paper
  • Country: US
  • Application: calendar Roll
  • NSK Product: TL Spherical

  • Approx life: 30 days
  • 12 failures annual

Value Proposals

  • NSK investigated the failed competitors bearings
  • Application review was conducted by NSK engineers
  • It was determined that the high heat in the application was causing the bearings inner rings to crack

Product Features

  • Innovative chemical steel composition
  • Special heat treatment process
  • High stregth inner and outer rings

  • Heat resistant to cracks
  • Greater resistance to hoop stress
  • Longer service life- more than twice that of conventional bearings operation under contaminated conditions
  • Greater dimensional stability under high temperatures ( to 200O C).

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
Bearings: 12 @$10,000 $120,000 Bearings: 6 @ $10,000 $60,000
Downtime: 4 hrs @ $1,500/hr x 6 $36,000 Downtime: Eliminated $0
Total Costs $156,000 x 5yrs= $780,000 $60,000 x 5yrs= $300,000

Reference: SS-E-

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