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Can Inconel be burnished?



CASE STUDY: BURNISHING INCONEL VALVE BODY - THE CHALLENGE


A customer of ours was trying to achieve a required surface finish by boring but could only maintain 16-20 Ra (0.4 – 0.5 Ra µm) Material: Inconel 718 Machine: Nakamura 5-axis mill-turn Part: Valve Body Finish Required: 8 Ra microinch (0.2 Ra µm) Part preparation: Single point boring tool OUR SOLUTION We recommended they use a multi-roll ID burnishing tools made by Elliott Tool Technologies. Here is the data for this burnishing operation: Speed: 500 RPM Feed: 0.040”/rev (1.0mm/rev) Pre-Op: Bored to 60 – 80 Ra (1.5 – 2.0Ra µm) FINAL RESULTS

The multi roll burnishing tool achieved a surface finish of 4-6Ra micro inch which was within the requirement. The manufacturer did not need secondary operations to achieve the required surface finish and cycle time was reduced due to a faster boring cycle. Finish Achieved: Less than 8 Ra micro inch (less than 0.4 Ra µm)

  • Eliminated the need for a secondary operation

  • Reduced cycle time

  • Reduced scrap levels


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