Magnetorheological polishing

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Magnetorheological polishing ( English magneto rheological finishing , MRF) describes a type of processing of optical components, e.g. B. Lenses . The process is used to polish and correct the optical effective surfaces and can therefore be the last step in the process chain of passport processing . This is usually followed by edge processing and centering of the component, followed by coating (e.g. tempering or mirroring ).

The tool in this case is a magnetorheological fluid made up of water, magnetic particles and polishing agent . This liquid is applied to a rotating wheel, and the suspension solidifies in a magnetic field . The surface to be processed is moved over the magnetorheological fluid in such a way that it is locally immersed. The movement of the wheel and the polishing agent contained in the solidified liquid remove material from the surface. The amount of material to be removed locally is controlled via the dwell time. The movement of the workpiece is usually computer-controlled, and the optical effective surface can be corrected in conjunction with measurement data.

literature

  • Patent US5449313 : Magnetorheological polishing devices and methods. ‌
  • Patent DE69924595T2 : System for magnetorheological fine machining of substrates. ‌
  • KF Beckstette: Ultra-precise surface processing using the example of lithography optics. In: tm-technical measurement. 69, 2002, p. 526, doi: 10.1524 / teme.2002.69.12.526 .
  • Aric B. Shorey, Stephen D. Jacobs, William I. Kordonski, Roger F. Gans: Experiments and Observations Regarding the Mechanisms of Glass Removal in Magnetorheological Finishing . In: Applied Optics . tape 40 , no. 1 , 2001, p. 20-33 , doi : 10.1364 / AO.40.000020 .