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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 3 — Feb. 1, 2010
  • pp: 2242–2257

Rigid conformal polishing tool using
non-linear visco-elastic effect

Dae Wook Kim and James H. Burge  »View Author Affiliations


Optics Express, Vol. 18, Issue 3, pp. 2242-2257 (2010)
http://dx.doi.org/10.1364/OE.18.002242


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Abstract

Computer controlled optical surfacing (CCOS) relies on a stable and predictable tool influence function (TIF), which is the shape of the wear function created by the machine. For a polishing lap, which is stroked on the surface, both the TIF stability and surface finish rely on the polishing interface maintaining intimate contact with the workpiece. Pitch tools serve this function for surfaces that are near spherical, where the curvature has small variation across the part. The rigidity of such tools provides natural smoothing of the surface, but limits the application for aspheric surfaces. Highly flexible tools, such as those created with an air bonnet or magnetorheological fluid, conform to the surface, but lack intrinsic stiffness, so they provide little natural smoothing. We present a rigid conformal polishing tool that uses a non-linear visco-elastic medium (i.e. non-Newtonian fluid) that conforms to the aspheric shape, yet maintains stability to provide natural smoothing. The analysis, design, and performance of such a polishing tool is presented, showing TIF stability of <10% and providing surface finish with <10Å roughness.

© 2010 OSA

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.4610) Optical design and fabrication : Optical fabrication
(220.5450) Optical design and fabrication : Polishing

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: November 5, 2009
Revised Manuscript: December 27, 2009
Manuscript Accepted: January 6, 2010
Published: January 20, 2010

Citation
Dae Wook Kim and James H. Burge, "Rigid conformal polishing tool using
non-linear visco-elastic effect," Opt. Express 18, 2242-2257 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-3-2242


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References

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  25. D. W. Kim, College of Optical Sciences, University of Arizona, 1630 East University Boulevard, Tucson, AZ 85721, and J. H. Burge are preparing a manuscript to be called “Parametric smoothing model for rigid conformal polishing laps that use visco-elastic materials.”

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