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October 2017

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Carbide-Roll Burnishing Tools Replace Secondary Processes

Carbide-Roll Burnishing Tools by Elliott Tool Technology, can produce a mirror-like surface finish while eliminating secondary operations and machining set-ups. "These cost-effective, easy-to-use carbide rolls from Monaghan Tooling Group improve surface irregularities and tool marks, producing optimum surface finishes of 4-20 microinch (0.1 to 0.5µm)," said a company spokesperson. They are suited for both CNC turning centers and manual lathes, for O.D. and I.D./O.D. burnishing applications. This technique can eliminate secondary processes such as grinding, honing and polishing by automating those processes in the primary CNC machine.

Carbide rolls can be reconditioned several times, yielding economical tool life. Shank sizes are available from 1.5" to 2.0" in diameter, or 40 mm to 50 mm, to process overall length of 9.5 " (241.3 mm) to 18" (457.2 mm). Roll radius from 0.032" (0.787 mm) to 0.093" (2.36 mm) are available.

Spherical surface burnish tools, available in either 1" or 25 mm square shank size, with a .125" radius, are designed for burnishing spherical and contoured surfaces to finishes as low as 2 to 8 Ra microinch. Other sizes and spherical designs are available on request.

Carbide roll burnishing is suited for a wide variety of parts and ductile metals under Rc40, including steel, stainless steel, aluminum and cast iron. A Concord, NH, job shop recently experienced the benefits of this tooling in a heavy machining horizontal table lathe application. An exceptional finish was needed on the I.D. of a roughly 6' diameter ring made of a stainless grade with an average hardness of Rc33. The I.D. had both parallel and tapered walls. Starting with a pre-burnished surface finish of 120 Ra microinch, the company was able to obtain a single digit surface finish in a single pass at 450 SFM and 0.035 IPR. This eliminated many hours of fine boring and hand polishing. "I would estimate we are machining these parts in 1/10th the time we were previously: from 40 hours to 4 hours," said the company president.

"Elliott carbide roll tools increase the surface hardness through the cold working process and compressive forces, and increase metal's resistance to fatigue and failure at stress points while producing a dense and uniform surface," said an Elliott spokesperson.

For more information contact:

Monaghan Tooling Group

30 North Clinton Street

Dayton, OH 45402


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