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Proceedings Paper

Material removal study at silicon nitride molds for the precision glass molding using MRF process
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Paper Abstract

High-technology applications which are using high precision optic components in high and medium quantities have increased during recent years. One possibility to mass-produce e.g. such lenses is the precision glass molding (PGM) process. Especially for aspheric and free-form elements the PGM process has certain advantages. Premise is to manufacture accurate press molds, which have to feature smaller figure errors as the required lenses and may be made of materials, which are difficult to machine, like silicon nitride ceramics. These work pieces have to be machined in economical and steady process chains. However, due to the complex shapes and the corresponding accuracy an error dependent polishing is required. The Magnetorheological Finishing (MRF) as a high precision computer controlled polishing (CCP) technique is used and will further be presented in this work. To achieve the postulated demands a previous study of the material removal at selected machining parameters is needed. Changing machining parameters modify the removal, which is presented through values like the peak and volume removal rate. The value changes during the controlled variation of process parameters are described and discussed. Magnetorheological Finishing (MRF) provides one of the best methods to finish PGM molds that are relatively inaccurate to high precision in an economical, steady and efficient way. This work indicates the MRF removal selection and removal interference for the correction and finishing of precise silicon nitride molds for the precision glass molding.

Paper Details

Date Published: 29 August 2008
PDF: 12 pages
Proc. SPIE 7060, Current Developments in Lens Design and Optical Engineering IX, 706007 (29 August 2008); doi: 10.1117/12.794583
Show Author Affiliations
Andreas Geiss, Univ. of Applied Sciences Deggendorf (Germany)
Alexander Dubcek Univ. of Trencin (Slovakia)
Rolf Rascher, Univ. of Applied Sciences Deggendorf (Germany)
Juraj Slabeycius, Alexander Dubcek Univ. of Trencin (Slovakia)
Markus Schinhaerl, Univ. of Applied Sciences Deggendorf (Germany)
Peter Sperber, Univ. of Applied Sciences Deggendorf (Germany)
Fathima Patham, Univ. of Applied Sciences Deggendorf (Germany)


Published in SPIE Proceedings Vol. 7060:
Current Developments in Lens Design and Optical Engineering IX
Pantazis Z Mouroulis; Warren J. Smith; R. Barry Johnson, Editor(s)

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