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Introduction

A British producer of plastic bottles experienced failures of linear guides on extrusion blow molding machines. NSK examined some failed guides concluding that the failures were due to damaged end caps, caused by a combination of short stroke length, repeated start stop operation and increased friction force start up. NSK recommended the trial of NSK roller guides which have optimised internal design to reduce start up torque, resulting in less force on the end caps. The new design was fitted to one machine with no failures reported for over a year. This has eliminated production down time giving a significant saving on maintenance and lost production costs.

Extrusion Blow Molding Machine
  • Extrusion Blow Molding Machine
NSK RA Roller Guides
  • RA Roller Guides

Key Facts

  • Plastic bottle manufacturing
  • Frequent bearing failure across a number of machines
  • Linear roller guides failing due to damage to recirculation end caps
  • NSK recommend linear guides RA Series that have spacer joints between rollers
  • Reduced start up friction force
  • Failures on trial machine eliminated
  • Significant reduction in maintenance and lost production costs

Value Proposals

  • The customer experienced many failures on several machines. NSK performed an on-site Application Review as part of the AIP process
  • A Failure Investigation report identified the route cause
  • A trial was conducted using NSK Linear Guides
  • Significant improvement demonstrated

Product Features

  • Super-high load capacity
  • Super-high motion accuracy
  • Retaining pieces between rollers reduces roller skew helping achieve smooth motion
  • Super-high rigidity
  • Low friction
  • Low noise
Cost Saving Breakdown
Before Cost p.a. NSK Solution Cost p.a.
Bearing Costs € 7 400 Bearing Costs € 5 781
Engineering Costs € 4 047 Engineering Costs € 1 619
Costs of lost production € 55 502 Costs of lost production € 0
Total Costs € 66 949 € 7 400

Reference:SS-E-2-782

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