Manufacturing: Surface Finishing

Burnishing -

Burnishing is a cold forming process, without actual removal of metal, where a tool is rubbed on the metal surface of the part with sufficient force to cause plastic flowing of the metal. This allows the high spots to be flattened out and the valleys filled in. It is a new concept in finishing Components.This process eliminates Grinding and honing which are costlier processes while improving the surface finish, surface hardness, wear-resistance, fatigue resistance and corrosion resistance of a part.

Roller Burnishing -

The surface of metal parts worked through turning, reaming or boring operations is a succession of peaks and valleys when microscopically examined. The Roller burnishing operation compresses the Projections (Peaks) into the Indentation (Valleys) thus forming a smooth mirror finished surface. Any material not exceeding 40 Rockwell Hardness "C" can be roller burnished.

One or several rollers are pressed against the workpiece with the nearly perpendicular force (burnishing force). This generates a high compressive stress in the piece of the surface profile, which plastically forms the top layer. The material volume of the peaks is displaced into the zones of lower compressive stress (the valleys).