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

Andreas Geiss; Rolf Rascher; Juraj Slabeycius; Markus Schinhaerl; Peter Sperber; Fathima Patham

doi:10.1117/12.794583

29 August 2008 Material removal study at silicon nitride molds for the precision glass molding using MRF process

Andreas Geiss, Rolf Rascher, Juraj Slabeycius, Markus Schinhaerl, Peter Sperber, Fathima Patham

Proceedings Volume 7060, Current Developments in Lens Design and Optical Engineering IX; 706007 (2008) https://doi.org/10.1117/12.794583
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

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.

Citation Download Citation

Andreas Geiss, Rolf Rascher, Juraj Slabeycius, Markus Schinhaerl, Peter Sperber, and Fathima Patham "Material removal study at silicon nitride molds for the precision glass molding using MRF process", Proc. SPIE 7060, Current Developments in Lens Design and Optical Engineering IX, 706007 (29 August 2008); https://doi.org/10.1117/12.794583

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available