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Introduction

An important manufacturer of raw steel materials (strip and tubes) was facing issues with standard bearings, mounted in the welding station of a tube making machine. The high temperature of the welding area shortened the bearing life, breaking after short operation and causing continuous production stoppages for bearing replacement. The customer calculated a loss in production of 500 kg of tubes at every stoppage plus partial scrap of actual production. NSK proposed bearings for high temperature environments with special grease. With this solution the customer increased the bearing life. He also established preventive maintenance periods. All These measures led to increased productivity and Elimination of scrap.

 

Key Facts

  • Welding station on steel tube making machine
  • Short life of bearings causing production stoppage
  • Productivity reduced by 500 kg of tube per stoppage
  • Every production stoppage causing partial scrap of actual production
  • Temperature of welding area effected life of bearings
  • NSK Solution: high temperature Deep Groove Ball Bearings
  • Increased bearings life
  • Customer was able to start a preventive maintenance programme
  • Steel Tube Making Machine High Temperature Deep Groove Ball Bearings

 

Steel Tube Making Machine Steel Tube Making Machine
High Temperature Deep Groove Ball Bearings High Temperature Deep Groove Ball Bearings

Background Information

  • Sector: Steel
  • Country: Spain
  • End-product: Steel tubes
  • Application: Welding station on steel tube making machine

 

  • Number of machines: 1
  • Approx. Lifetime: 3 weeks
  • Problem: short life of the bearings causing production stoppages and loss in production

 

Value Proposals

  • The customer explained that each stoppage caused a loss in production
  • NSK recommended Deep Groove Ball Bearings for high temperature with a special grease
  • A trial with the new bearings showed an increased bearing life

  • The successful test resulted in reduced machine downtime and increased productivity
  • The customer implemented a regular maintenance programme

 

Product Features

  • Bearing steel heat stabilised to +200 °C
  • High temperature Viton seal closures
  • High temperature grease +160 °C

 

  • Greater than normal clearance to accommodate bearing ring temperature differentials
  • Bearing greased and sealed for life
  • Bearing operating temperature +180 °C

 

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
6 Bearings set x 15 replacements/year  € 180 6 Bearings set x 6 replacements/year  € 360
1h downtime x 100€ labour cost x 15
replacements/year
€ 1.500 1h downtime x 100€ labour cost x 6
replacements/year
€ 600
Productivity loss of 1h x 15 replacements/year € 7.500 No costs € 0
Total Costs € 9.180 € 960

Reference: SS-E-7027

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