29 August 2008 Forces acting between polishing tool and workpiece surface in magnetorheological finishing
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Abstract
Magnetorheological finishing is a computer-controlled polishing technique that is used mainly in the field of high-quality optical lens production. The process is based on the use of a magnetorheological polishing fluid that is able, in a reversible manner, to change its viscosity from a liquid state to a solid state under the control of a magnetic field. This outstanding characteristic facilitates rapid control (in milliseconds) of the yield stress, and thus the pressure applied to the workpiece surface to be polished. A three-axis dynamometer was used to measure the forces acting between the magnetorheological fluid and the workpiece surface during determination of the material removal characteristic of the polishing tool (influence function). The results of a testing series using a QED Q22-X MRF polishing machine with a 50 mm wheel assembly show that the normal forces range from about 2 to 20 N. Knowledge of the forces is essential, especially when thin workpieces are to be polished and distortion becomes significant. This paper discusses, and gives examples of, the variation in the parameters experienced during a programme of experiments, and provides examples of the value of this work.
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Markus Schinhaerl, Markus Schinhaerl, Christian Vogt, Christian Vogt, Andreas Geiss, Andreas Geiss, Richard Stamp, Richard Stamp, Peter Sperber, Peter Sperber, Lyndon Smith, Lyndon Smith, Gordon Smith, Gordon Smith, Rolf Rascher, Rolf Rascher, } "Forces acting between polishing tool and workpiece surface in magnetorheological finishing", Proc. SPIE 7060, Current Developments in Lens Design and Optical Engineering IX, 706006 (29 August 2008); doi: 10.1117/12.794196; https://doi.org/10.1117/12.794196
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