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Introduction

A manufacturer of MDF boards was facing problems of premature bearing failures every 2-3 months on the work roll of the grinding machine. Shock loads and vibrations significantly impacted on the bearing overall performance. The customer was not satisfied with the short bearing lifetime which caused additional costs for maintenance works and unplanned downtime during production. Standard bearings were used. The customer's requirement was at least one year bearing lifetime in order to be able to do only planned shutdowns and maintenance. NSK engineers studied operation conditions and drawings of the machine. As a result, special Spherical Roller Bearings for vibrating screens were provided for testing. The bearing lifetime was extended to 10.000 hours which met the expected lifetime.

 

Key Facts

  • Unplanned production stoppage
  • Additional costs for maintenance works and bearings
  • NSK Solution: Bearings for vibrating screens application
  • Increase of bearing lifetime
  • Cost savings on maintenance and bearings
  • Wood Processing Plant
  • NSK EVB Spherical Roller Bearing

Value Proposals

  • NSK engineers analysed the operation conditions and the design of the machine unit
  • The analysis revealed that shock loads and vibrations had a significant impact on the overall bearing performance
  • Special bearings for vibration screens were provided for testing
  • After 14 months, the bearings were replaced during planned maintenance, no unplanned shutdowns occurred at that time and the customer benefited from reduced maintenance costs

Product Features

  • Precision machined tough one piece brass cage, contoured roller pockets
  • Improved surface roughness on rollers & inner & outer ring
  • Special heat treatment rollers, prevent cracks from vibrations & shock loads
  • Self aligning ability with floating guide ring
  • Controlled roller skew
  • Internal radial clearance set at 2/3 ISO standard bearings
  • Outer dimensions set at 1/2 of ISO standard bearings
  • 40mm - 200mm bore diameter
  • Twice the service life of conventional bearings
  • High dynamic & static load ratings - load rating increased by 1.25 time
  • Dampened vibration & highly resistant to heavy or shock loads
  • High speed performance & low operating temperature rise
  • Better roller guidance & smooth running - reduced bearing damage from slippage, surface fatigue, flaking

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
Bearing consumption per year € 3.400 No bearing changes € 0
Cost of downtime € 10.000 No downtime € 0
Total Costs € 13.400 € 0

Reference:SS-E-33003

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