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Introduction

A customer was eexperiencing mechanical failures on quench drives due to wear in the Teflon bushes supporting the quench rollers. This caused the rollers to drop and damage the sprockets and chains, causing the manufactured steel shoe to stick. The result was poor heat treatment of the shoes and subsequent quality issues. NSK recommended replacing the Teflon bushes with stainless steel Molded-Oil bearings. The bearings began a 12 months trial without problem and subsequently all bushes were converted in the quench area to NSK Molded-Oil.

Key Facts

  • Quench conveyor
  • Mechanical failure of rollers caused manufactured heat treated shoes to stick and therefore insufficiently quenched
  • Poor quality heat treatment of shoes
  • NSK Solution: Molded-Oil
  • Improvement to quality of heat treatment
  • Significant cost saving on downtime, parts and maintenance labor
  • Quench Conveyor
  • Molded-Oil

Value Proposals

  • NSK application review highlighted poor bearing life and costly downtime
  • NSK recommended stainless steel Molded-Oil bearings which lasted 12 months in operation without failure
  • Additional benefit of not having to replace costly conveyor items - chain, sprokets and rollers

Product Features

  • Available for high speed applications
  • Available in Ball Bearing, Spherical Roller Bearing and Tapered Roller Bearing types
  • Rust-proof - Stainless steel for corrosive environments
  • Ideal for applications where contact with liquids and chemicals is unavoidable
  • Seals made from nitrile rubber
  • Contact-seal type available in standard inventory for ball bearings
  • Able to minimize oil leakage
  • Longer service life
  • No need for re-lubrication
  • Smooth rotation of rolling elements

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
Cost of replacement parts - Chain, Teflon bushes, Sprockets, Rollers $22,097 Cost of Molded-Oil bearings $16,151
55 hours downtime @ $4,404 / hour $242,220 No downtime $0
Labor for maintenance 380 hrs @ $29 / hour $11,020 No maintenance $0
Total Costs $275,337 $16,151

Reference:SS-E-2026

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