Article From: 9/28/2004 Production Machining
By making use of special rollers that cold work a metal surface, the line of Superoll burnishing tools can burnish the inside or outside diameters of any bored, reamed or turned workpiece to produce a fine, wear-resistant finish (down to 2 micro-inches or less) in one pass, resulting in a mirror-like, smoother, harder surface with better resistance to corrosion than a ground or honed workpiece, the company says.
These tools are typically used in burnishing connecting rod bearing surfaces, cylinders, piston housings, shafts, connecting rods and pins, valves and valve seat surfaces, in the critical semiconductor industry, and in any mating surfaces.
Unlike the metal removal process of grinding, honing, lapping and other finishing methods that cut to remove rough machining markings on a part, the tool uses a plastic deformataion-process to cold work the rough metal into a smooth, hard surface, free from irregularities.
The burnishing tools can reduce a 100 to 125 micro-inch machined surface of a workpiece to a 2 to 15 micro-inch finish in a single pass. One pass with a Superoll tool will finish some rough machined surfaces to 0.7 micro-inch, with an average of a 5 to10 percent increase in surface hardness within a depth penetration of 0.01" to 0.03" below the burnished surface.
The tools are available in standard designs to burnish workpieces with 0.176" to 7.917" IDs and ODs from 0.97" to 2.477".
These tools are available for burnishing internal and external diameters of a machined part, for tapered and stepped surfaces, contours, fillets and flat faces, bearing bores and for special applications.
They are also available for simultaneously burnishing the inside and outside diameters of machined parts with an OD as small as 0.82" and up to 3.75". The ID can range from 0.184" to 6.50".
