Case Study: Burnishing a Valve Seal Body

Summary Of Results

  • Reduced cycle time
  • Surface finish after burnishing: 8-16 Ra microinch (0.2-0.4 Ra)
  • Eliminated scrap

THE CHALLENGE

A manufacturer was machining stainless steel valve seal bodies using a Mori Seiki SL250 CNC Lathe. The valve body required a 60-degree inclusive angle to have a 16 Ra microinch (0.4 Ra) finish.
Previously, the company achieved this surface finish by using a boring bar with a light cut at a slow feed. This process was inconsistent and produced too many rejected parts, so they turned to us for advice.
valve seal body burnished using a burnishing tool

OUR SOLUTION

We recommended a CB297-00 Single Roll Burnishing Tool made by Elliott Tool Technologies. The customer mentioned that this tool was easy to set up and program, especially since the burnishing process is similar to the boring process.
Single roller burnishing tool boring bar style

FINAL RESULTS

Here were the final burnishing statistics:
  • Speed: 1,800 RPM
  • Feed rate: 0.001” per rev (0.3mm/rev)
  • Feed rate: 0.001” per rev (0.3mm/rev)
  • Surface finish after burnishing: 8-16 Ra microinch (0.2-0.4 Ra)
  • 27 Second Cycle Time
Elliott Tool Technologies’ single roll burnishing tool produced a consistently high-quality surface finish, eliminating scrap parts. Cost savings for the customer were a result of:
  • Reduced cycle time
  • Reduced frequency of inspection
  • Elimination of rejected components

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