Roller burnishing is a surface finishing technique in which hardened, highly polished steel rollers are brought into pressure contact with a softer component piece. As the pressure generated through the rollers exceeds the yield point of the piece-part material, the surface is plastically by cold flowing of the sub-surface material.
The result is a mirror-like finish and a tough, work-hardened surface with improved load-carrying characteristics. Roller burnishing displaces metal rather than removing it.
This process will normally produce a smoother surface with more wear resistance and improved corrosion resistance.
  
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