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TECHNICAL BRIEFS

Toward Magnetorheological Finishing of Magnetic Materials

[+] Author and Article Information
Shai N. Shafrir1

Department of Mechanical Engineering, Materials Science Program, University of Rochester, Rochester, NY 14627 and Laboratory for Laser Energetics, University of Rochester, 240 E. River Road, Rochester, NY 14623ssha@lle.rochester.edu

John C. Lambropoulos, Stephen D. Jacobs

Department of Mechanical Engineering, Materials Science Program, University of Rochester, Rochester, NY 14627 and Laboratory for Laser Energetics, University of Rochester, 240 E. River Road, Rochester, NY 14623

1

Corresponding author.

J. Manuf. Sci. Eng 129(5), 961-964 (Mar 09, 2007) (4 pages) doi:10.1115/1.2738540 History: Received October 30, 2006; Revised March 09, 2007

Magnetorheological finishing (MRF) is a precision optical finishing process traditionally limited to processing only nonmagnetic materials, e.g., optical glasses, ceramics, polymers, and metals. Here we demonstrate that MRF can be used for material removal from magnetic material surfaces. Our approach is to place an MRF spot on machined surfaces of magnetic WC-Co materials. The resulting surface roughness is comparable to that produced on nonmagnetic materials. This spotting technique may be used to evaluate the depth of subsurface damage, or deformed layer, induced by earlier manufacturing steps, such as grinding and lapping.

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Copyright © 2007 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

3D image of an MRF spot taken with a profilometer on WC-Co K3833 for 6min, (a) top view, and (b) center profile: (1) spot leading edge (where the MRF ribbon first contacts the material), (2) spot ddp (deepest point of MRF fluid penetration), and (3) spot trailing edge; arrow indicates MRF fluid flow directions

Grahic Jump Location
Figure 2

SEM images of typical processed surfaces; subscripts 1 and 2 represent the morphology of the initial ground/lapped surface and the surface within the MRF spot (i.e., ddp region): (a) K3520, and (b) BC14S, (c) cerbide, respectively

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