Burnishing for Mirror Surface Finish
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Burnishing for Mirror Surface Finish
Article Introduction
Bumishing is a mandatory process for achieving dimension control and mirror surface finish in machined components. In the current manufacturing scenario, delivering a product to the customer at right time with right quality at competitive prices is essential to retain the customer.

Article Description
Companies targeting to reduce production cost must be aware of their finishing processes, particularly if the component has very stringent dimensional tolerances and requires superior surface finishes. If a costly process is chosen to achieve the specification obviously the machining cost per component increases. Engineers should be judicious in selecting the right process especially when it comes to finishing a component. There are many ways to achieve close dimensional tolerances and superior surface finish.

A look at how this process of burnishing with the right tools helps manufacturers meet the finishing goal. Bumishing is a cold rolling process without actual removal of metal. It is a new concept in finishing the components. The surface of metal parts worked through turning, reaming or boring operations is a succession of "projection or peaks" and "indentations or valley" when microscopically examined. The roller burnishing operation compresses the "Projections" (peaks) into the "In- dentations" (valleys) thus forming a smooth mirror finished surface. Any material not exceeding 40 Rockwell hardness "C" can be roller bumished. Roller burnishing tools generally consist of a series of tapered and highly polished precision rollers made of high-speed steel or carbide material, positioned in slots with a rotating cage. The rollers rotate around on an inversely tapered mandrel. The tool or part can be rotated at optimum speed to develop pressure that exceeds the yield point of softer work piece to get desired results.

Burnishing is the cheapest process and high productivity is assured. Rejections will be totally eliminated as you can achieve accurate size as well as mirror surface finish by doing the burnishing operation.
Range of Products includes:

Multi Roller Burnishing Tools:
These include internal diameter tools (for plain and stepped bore): external diameter tools (for plain and stepped shaft); taper tools (internal and external taper); and face tools (for fiat circular faces).
Single Roller Burnishing Tools:
These include single roller carbide tool (for large outer diameter); multi surface single roller carbide tool (for larger OD. ID and flat circular faces); and "H" type single roller tool (for small outer diameters).
Special Tools:
These include combined bore burnishing tools (for concentric bores); sizing and finishing tools (for removing taper and ovality in the bore): spherical burnishing tools (for burnish- ing spherical profiles/ball races); groove burnishing tools (for external grooves): and spherical burnishing tools (for external spherical profiles).
Burnishing Machines:
These include outer diameter burnishing machine (portable type); outer diameter centreless burnishing machine (hydraulic); internal diameter burnishing machine (pneumatically operated); and internal diameter burnishing machine (hydraulically operated).
Posted : 8/12/2005

Burnishing for Mirror Surface Finish