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Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Load controlled process window analysis of feed controlled CNC grinding

PROCEEDINGS VOLUME 10692 SPIE OPTICAL SYSTEMS DESIGN, 14-17 MAY 2018 Optical Fabrication, Testing, and Metrology VI, Frankfurt, Germany

2018

ISBN: 978-1-5106-1921-0

DOI: 10.1117/12.2315336

Beitrag (Sammelband oder Tagungsband)

O. Fähnle, M. Doetz, Christian Vogt, O. Dambon, F. Klocke, Rolf Rascher

Ductile grinding of tungsten carbide applying standard CNC machines: a process analysis

Proceedings of SPIE 10692: SPIE Optical Systems Design/Optical Fabrication, Testing, and Metrology VI (14.-17.05.2018; Frankfurt/Main)

2018

DOI: 10.1117/12.2315338

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder Tagungsband)

O. Fähnle, Christian Vogt, Rolf Rascher, Christian J. Trum, Sebastian Sitzberger

Filled-Up-Microscopy (FUM): a non-destructive method for approximating the depth of sub-surface damage on ground surfaces

Proceedings of SPIE 10829 (Fifth European Seminar on Precision Optics Manufacturing [April 10-11, 2018; Teisnach])

2018

ISBN: 978-1-5106-2270-8

DOI: 10.1117/12.2318576

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder Tagungsband)

O. Fähnle, M. Doetz, Christian Vogt, O. Dambon, F. Klocke, Rolf Rascher

Ductile mode single point diamond turning (SPDT) of binderless tungsten carbide molds

Proceedings of SPIE Optical Engineering + Applications (19-23 August, 2018; Optical Manufacturing and Testing XII; San Diego, CA, USA), San Diego, United States, vol. 10742

2018

ISBN: 978-1-5106-2055-1

DOI: 10.1117/12.2323244

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder Tagungsband)

O. Fähnle, Christian Vogt, Rolf Rascher, Olaf Dambon, Fritz Klocke, Marius Doetz

From turning to grinding: ductile machining with gPVA

Proceedings of SPIE Optical Engineering + Applications (19-23 August, 2018; Optical Manufacturing and Testing XII; San Diego, CA, USA), San Diego, United States, vol. 10742

2018

ISBN: 978-1-5106-2055-1

DOI: 10.1117/12.2323246

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Beitrag (Sammelband oder Tagungsband)

O. Fähnle, M. Doetz, Christian Vogt, O. Dambon, F. Klocke, Rolf Rascher

Ductile grinding of tungsten carbide molds applying standard CNC machines

Proceedings of SPIE Optical Engineering + Applications (19-23 August, 2018; Optical Manufacturing and Testing XII; San Diego, CA, USA), San Diego, United States, vol. 10742

2018

ISBN: 978-1-5106-2055-1

DOI: 10.1117/12.2323245

Beitrag (Sammelband oder Tagungsband)

O. Fähnle, Christian Vogt, Rolf Rascher, DaeWook Kim

Closed-loop next generation laser polishing

Proceedings of SPIE 10829 (Fifth European Seminar on Precision Optics Manufacturing [April 10-11, 2018; Teisnach])

2018

ISBN: 978-1-5106-2270-8

DOI: 10.1117/12.2318749

Beitrag (Sammelband oder Tagungsband)

O. Fähnle, M. Doetz, Christian Vogt

SPDT and standard CNC-grinding of tungsten carbide molds for precision glass molding: an experimental process analysis

Proceedings of SPIE 10829 (Fifth European Seminar on Precision Optics Manufacturing [April 10-11, 2018; Teisnach])

2018

ISBN: 978-1-5106-2270-8

DOI: 10.1117/12.2318710

Beitrag (Sammelband oder Tagungsband)

gPVA: a system for the classification of grinding tools

Proceedings of SPIE 10829 (Fifth European Seminar on Precision Optics Manufacturing [April 10-11, 2018; Teisnach])

2018

ISBN: 978-1-5106-2270-8

DOI: 10.1117/12.2318695

Vortrag

Christian Vogt

Standardized evaluation of grinding tools for brittle and ductile mode grinding

European Optical Society Biennial Meeting (EOSAM) 2018, Delft, Niederlande

2018

Grinding processes offer a variety of parameters that influence the quality and quantity of the optical elements to be produced. Systematic optimization can also uncover unused potential in "stable and efficient" processes. gPVA (grinding Process Validation Approach) is a system for describing grinding processes. It was first presented in 2017 as a tool for process optimization. gPVA is a method to evaluate different grinding tools in terms of maximum material removal. Therefore, a standardized testing procedure was developed, that can be carried out on standard CNC grinding machines (Fig 1). The data is used to identify parameter sets with valid points of operation with a linear proportion of feed speed and force. In order to evaluate the data independently of cutting speed and tool geometry, a so-called removal rate is calculated. This can essentially be understood as material removal rate.

Vortrag

O. Fähnle, Christian Vogt, Rolf Rascher, Eckart Langenbach

In situ laser monitoring of laser polishing

119. Jahrestagung der Deutschen Gesellschaft für angewandte Optik (DGaO), Technische Hochschule Aalen

2018

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

A novel fabrication parameter controlling method for laser polishing is presented, measuring within the footprint the smoothening process in real time. Recently, a new method for in situ measuring level of surface roughness has been developed [1] where a HeNe laser beam is being reflected from within the sample at the surface under test and the intensity of its reflected beam is being monitored.In this paper we report on an experimental study where this method has been applied to laser polishing. The internal local surface area under test is chosen to be located at the very spot where the laser polishing footprint is located from the outside of the sample melting its surface locally. Because fused silica is not transparent at the operating CO2 laser wavelength, the intensity of the reflected beam can be monitored enabling an in situ control of the laser polishing process. Consequently, the optimum dwell time can be determined, a footprint needs to stay at a certain point before moving further enabling a more stable and cost optimized polishing. [1] O.Fähnle,“In process monitoring of optics fabrication”, SPIEconference “PrecisionOptics Manufacturing”2017

Zeitschriftenartikel

O. Fähnle, Christian Vogt, Rolf Rascher, D.W. Kim

Closed-loop laser polishing using in-process surface finish metrology

Applied Optics, vol. 57, no. 4, pp. 834-838

2018

DOI: 10.1364/AO.57.000834

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

This paper lays out the trail onto a closed-loop polishing process of optical elements enabling the application of the optimum polishing time needed. To that aim, an in-process testing method for monitoring an inclusive micro surface quality (e.g., comprising surface roughness and scratch-and-dig) within the polishing spot is analyzed and its applicability to closed-loop polishing for classical loose-abrasive full-aperture polishing as well as for computer controlled laser polishing is experimentally tested and verified. This enables the determination of the optimum local dwell time resulting in a stable and cost optimized polishing.

Beitrag (Sammelband oder Tagungsband)

Christian Vogt, Bin Dong, Rolf Rascher

Wear detection of brass bond diamond grinding wheel by spectral coherence of grinding forces

Proceedings of the 17th International Conference of the European Society for Precision Engineering and Nanotechnology [euspen] (May 29 - June 2, 2017; Hanover, Germany)

2017

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

Zeitschriftenartikel

Christian Vogt, Rolf Rascher, C. Faehnle

Grinding Process Validation Approach (gPVA)

Journal of Physical Science and Application, vol. 7, no. 5

2017

DOI: 10.17265/2159-5348/2017.05.004

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

Beitrag (Sammelband oder Tagungsband)

Setting-up high-end cnc grinding processes: a Preston-based approach

Proceedings of EOS Optical Technologies Conferences at the World of Photonics Congress (WPC 2017) [Munich, Germany; June 26-29, 2017]

2017

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

The design of grinding processes is commonly based on the principle of trial and error. In most cases this will end up with a usable setup that delivers acceptable results. On the other hand this method is unlikely to reveal the process’s total potential. Allthough the principles of grinding and polishing are entirly different, the preston approach can be used to design grinding processes more intelligent and highly efficient. Carrying out a testing procedure for grinding tools reveals the tool’s removal properties on different materials. This allows to choose ideal sequences of pre and fine-grinding. Furthermore it is possible to choose the optimum machining parameters to optain a maximum output.

Beitrag (Sammelband oder Tagungsband)