Publikationen


Suche nach „[Rolf] [Rascher]“ hat 188 Publikationen gefunden
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    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Bin Dong, Christian Vogt, 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

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Zeitschriftenartikel

    Christian Vogt, C. Faehnle, Rolf Rascher

    Grinding Process Validation Approach (gPVA)

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

    2017

    DOI: 10.17265/2159-5348/2017.05.004

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian Schopf, Rolf Rascher, Johannes Liebl

    Cheap and fast measuring roughness on big surfaces with an imprint method

    Proceedings of SPIE 10448 (SPIE Optifab [October 16-19, 2017; Rochester, NY, USA])

    2017

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian Vogt, O. Fähnle, Rolf Rascher

    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

    Abstract anzeigen

    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.

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian Vogt, O. Fähnle, Rolf Rascher

    Three wagons Approach Applied to Optimization of Industrial Grinding Processes

    Optical Fabrication and Testing part of Optical Design and Fabrication: 9-13 July 2017, Denver, Colorado, United States, Washington, D.C., USA

    2017

    ISBN: 978-1-943580-31-6

    DOI: 10.1364/OFT.2017.OTu2B.2

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Rolf Rascher, Christian Vogt, C. Faehnle

    In situ laser polishing optimization method: Control of LASer Surface Optimisation (C-Lasso)

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

    2017

    Abstract anzeigen

    Laser polishing is achieved by local absorption of laser power within the polishing spot causing the surface and its sub-surface region to melt and flow reducing surface roughness and removing sub-surface damage. In this paper we present a novel fabrication controlling method for laser polishing processes called C-Lasso (Control of LASer Surface Optimization, Patent Pending), monitoring in situ the surface smoothening process. It is possible to determine and control the minimum dwell time a footprint needs to stay at a certain point before moving further. C-Lasso enables to avoid unnecessarily long local dwell times. Besides the functioning principle, a proof of concept will be presented as well as experimental data demonstrating the in situ monitoring.

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Robert Schneider, Alexander Haberl, Rolf Rascher

    Parametrization of a Subaperture Polishing Tool - Analysis of the Path Tests

    Optical Fabrication and Testing part of Optical Design and Fabrication: 9-13 July 2017, Denver, Colorado, United States, Washington, D.C., USA

    2017

    ISBN: 978-1-943580-31-6

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Sebastian Sitzberger, Christian J. Trum, Rolf Rascher

    Analysis of the influence of the workpiece self-weight in precision optics manufacturing using FEM simulation

    Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

    2017

    DOI: 10.1117/12.2273023

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian Vogt, O. Fähnle, Rolf Rascher

    Force-controlled analysis tool for optimization of precision CNC grinding processes

    Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

    2017

    DOI: 10.1117/12.2272713

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian J. Trum, Sebastian Sitzberger, Rolf Rascher

    Advanced method for the characterization of polishing suspensions

    Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

    2017

    DOI: 10.1117/12.2272431

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Alexander Haberl, Rolf Rascher

    Yet one more dwell time algorithm

    Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

    2017

    DOI: 10.1117/12.2270540

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Engelbert Hofbauer, Rolf Rascher, Felix Friedke, R. Kometer

    Resolution, measurement errors and uncertainties on deflectometric acquisition of large optical surfaces "DaOS"

    Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

    2017

    DOI: 10.1117/12.2267513

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Robert Schneider, Alexander Haberl, Rolf Rascher

    Polishing tool and the resulting TIF for three variable machine parameters as input for the removal simulation

    Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

    2017

    DOI: 10.1117/12.2267415

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Rolf Rascher, C. Weingarten

    Hybridfertigung optischer Oberflächen

    F.O.M.-Konferenz 2016 - Innovative Industrien unterstützen, Berlin

    2016

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Zeitschriftenartikel

    Engelbert Hofbauer, Rolf Rascher

    Deflectometric Acquisition of Large Optical Surfaces DaOS

    Using a new physical measurement principle: vignetting field stop procedure

    Optik&Photonik, vol. 11, no. 5, pp. 40-44

    2016

    DOI: 10.1002/opph.201600036

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Zeitschriftenartikel

    Engelbert Hofbauer, Rolf Rascher, Manon Schilke, Johannes Liebl, J.-P. Richters

    Deflectometric Acquisition of Large Optical Surfaces “DaOS” Using a New Physical Measurement Principle: Vignetting Field Stop

    (Reprinted from Proceedings of SPIE Volume 10009: Third European Seminar on Precision Optics Manufacturing, 100090Y [Teisnach, April 12th 2016] doi:10.1117/12.2236134)

    Bavarian Journal of Applied Sciences, no. 2, pp. 146-161

    2016

    Abstract anzeigen

    The vignetting field stop procedure uses a deflectometric approach to acquire big Optical Surfaces – DaOS – and it offers the possibility to measure nearly any shape or form using a scanning routine. The basic physical measurement principle in DaOS is the vignettation of a quasi-parallel light beam emitted by an expanded light source in auto collimation arrangement with a reflecting element. Thereby nearly any curvature of the specimen, is measurable. Due to the fact, that even sign changes in the curvature can be detected, also aspheres and freeform surfaces of any size can be evaluated. In this publication the vignetting field stop procedure is discussed. Additionally the deflectometric setup is described. Because of some typical influences of beam deflection to the accuracy of angle measurement by using the vignetting principle, suitable methods of calibration for the sensor are examined and the results of these methods are presented. Furthermore, the technical principle of deflectometric measurements using an angle detecting device is explained inclusive of all random and systematic errors generated by the setup. The last part of this publication shows the actual result of test measurements with calculated absolute deviation of errors with a large lateral dimension as well as the determination of the maximal achievable lateral resolution by detecting mid frequent structures on flat and spherical test parts with a diameter of 300 mm. These measurements are compared critically to reference results which are recorded by interferometry and further scanning methods.

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Christian Schopf, Rolf Rascher

    Reducing forces during drilling brittle hard materials by using ultrasonic and variation of coolant

    Optics and Measurement International Conference 2016, Liberec, Tschechische Republik

    2016

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian Schopf, Rolf Rascher

    Reducing forces during drilling brittle hard materials by using ultrasonic and variation of coolant

    Proceedings of SPIE 10151

    2016

    DOI: 10.1117/12.2257106

    Abstract anzeigen

    The process of ultrasonic machining is especially used for brittle hard materials as the additional ultrasonic vibration of the tool at high frequencies and low amplitudes acts like a hammer on the surface. With this technology it is possible to drill holes with lower forces, therefor the machining can be done faster and the worktime is much less than conventionally. A three-axis dynamometer was used to measure the forces, which act between the tool and the sample part. A focus is set on the sharpness of the tool. The results of a test series are based on the Sauer Ultrasonic Grinding Centre. On the same machine it is possible to drill holes in the conventional way. Additional to the ultasonic Input the type an concentration of coolant is important for the Drilling-force. In the test there were three different coolant and three different concentrations tested. The combination of ultrasonic vibration and the right coolant and concentration is the best way to reduce the Forces. Another positive effect is, that lower drilling-forces produce smaller chipping on the edge of the hole. The way to reduce the forces and chipping is the main issue of this paper.

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian Vogt, S. Sinzinger, Martin Rohrbacher, Rolf Rascher

    Prediction of grinding tool wear and lifetime by using a test bench

    Proceedings of SPIE 10009 (Third European Seminar on Precision Optics Manufacturing, 100090Y [April 12th 2016, Teisnach])

    2016

    NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Beitrag (Sammelband oder Tagungsband)

    Christian J. Trum, Rolf Rascher

    Improving efficiency of chemo-mechanical polishing processes by systematic selection and conditioning of the polishing suspension

    Proceedings of SPIE 10009 (Third European Seminar on Precision Optics Manufacturing, 100090Y [April 12th 2016, Teisnach])

    2016

    DOI: 10.1117/12.2236000

    Abstract anzeigen

    During design of optical systems or individual components, customers and designers already predetermine the way through production and the necessary resources. They define the tolerances that are required for their application like shape, micro-roughness and cleanliness, as well as the glass material that is necessary for the targeted optical effect. By the tolerances, they have also an influence on the manufacturer and his decisions on the production environment, measurement technology and the process chain that in his opinion is necessary to meet the specification. In most cases the type of polishing suspension and its parameters are also predetermined by the use of central polishing supply systems. With this paper, the authors want to give a prospect of a currently running research with the aim of increasing the efficiency of chemo-mechanical polishing processes by a systematic selection and conditioning of the polishing suspension. They want to show that small amounts of well-conditioned and stabilized polishing suspension could be a tool to improve the efficiency in CMP processes under the influence of the global trend to products that are more individual and down to one piece flow production. Main parts of this research are the identification of influences of polishing suspensions on the quality criteria of optical components and the creation of a method to find well-working suspension parameters in a deterministic and reproducible way. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.