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nutates , or whose oscillation plane slowly bumped against equally. self forming and to be continually presenting wobbles . Consequently, every surface is, on average, Plastic / Plastic Impact Deformation fresh media to the polishing gap. To assure uniformity, the highly elastic abrasive media must be somewhat plastic in order to be pad progress around the entire geometry of the workpiece with the eccentric path. Ulti- mately, the full circular oscillation will have engaged each portion of the surface. Planar oscillations may treat surfaces parallel to the oscillation plane differently. They may be always—or never —in contact with the abrasive media, causing the plane of oscillation to change during processing allowing all surfaces of complex, three dimensional geometries to be abraded equally. With a simultaneous linear, oscilla- tion—along an axis, perpendicular to the circular oscillation, ideally of equal ampli- tude and nearly the same frequency as the circular oscillation) the resultant path is an elliptical oscillation plane that bumps into the media pad, elastically compresses it (5 to 20%) and slides across as the workpiece moves along its orbital oscillation path. As the circular eccentric oscillation continues, portions of the workpiece sliding across the media Orbital Oscillation A small orbital (0.5 to 5 mm) circular eccentric planar oscillation is applied to the workpiece so that, at any point in its oscillation, a portion of its surface displacer gap) —accommodating the layer of media and a clearance. —that is roughly a mirror image of the workpiece (plus or minus a slides across a complementary portion of the compressed elastic plastic self- formed pad. This pad is comprised of a layer of Extrude Hone’s special visco- elastic abrasive media—positioned on the surface of a

Oribtial Abrasive Flow Machining - 19736 Orbital Abrasive Flow Machining — Orbital AFM

Orbital AFM Concept The general concept is to provide a translational motion of the workpiece, as a portion of its geometry encounters, compressively displaces, and tangentially abrasive polishing tool Orbital AFM surface and edge finishing is achieved by rapid, low-amplitude, oscillations of the workpiece relative to a self-forming, elastic plastic, . The tool is a pad or layer of abrasive-laden, elastic plastic media— similar to that used in extrusion abrasive flow finishing, however it is typically higher in viscosity and more elastic.
Elastic/plastic mediaAir gapDisplacer (tool)WorkpieceTranslational “slip” across compressed self-forming elastic abrasive “pad” formed of Extrude Hone’s special elastic/plastic media1–2% plastic deformationCompression at 20% elastic deformation

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