ASPHERO5 - rapid fabrication of precise aspheres

Boerret, Rainer; Giggel, Volkmar; Wang, Hexin

doi:10.1117/12.623327

Cited by 6 publications

(4 citation statements)

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“…Midspatial artifacts are mostly generated by the aspherical grinding step [3] . The basic causes are cutter marks based on the K-ratio between tool and workpiece and machine vibrations [4], which generate a pattern on the surface. A major challenge for all polishing processes applied to aspheres is to minimize the midspatials.…”

Section: Sd Tool For Analyzing Surfacesmentioning

confidence: 99%

ASPHERO5 – Simulation and Analysis of Aspherical Polishing Process

Boerret

Kelm

Thieß

et al. 2007

KEM

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ASPHERO5 is a funded German research project (project prime: Schneider OpticalMachines) with the goal of economic fabrication of high precision aspheres. The research is concentrated on the classical process chain consisting of grinding and polishing. The characterization of the incoming and outgoing surface quality is one issue to characterize the improvements. The variation of the local removal rate related to local curvature is one of the limiting factors of the polishing process. In this paper we report on first results characterizing the surface quality with a PSD (Power Spectral Density) algorithm and analyzing the local removal rates for the polishing step. In our research, two types of aspheres with 30 and 60 mm diameter were polished with a spinning tool process. The final deviation between simulation and experiment was less than 10 percent. That’s the starting point for further investigations within the project.

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Section: Sd Tool For Analyzing Surfacesmentioning

confidence: 99%

ASPHERO5 – Simulation and Analysis of Aspherical Polishing Process

Boerret

Kelm

Thieß

et al. 2007

KEM

Self Cite

View full text Add to dashboard Cite

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“…They are widely used in projection and display devices, mirrors and lenses assemblies, interferometric sensors and other precision components with complicated geometric shapes (Guvenc and Srinivasan, 1997). Such utilization is leading to an increasing demand on quality aspheric and complex optical surfaces (Boerret et al, 2005) in recent years. Moreover, upon the release of Polaroid's first instant camera (Raymond et al, 2004), optical surfaces that transcend the constraint of rotational symmetry have also been implemented in advanced optical systems with great successes.…”

Section: Introductionmentioning

confidence: 99%

Experimentation on MR fluid using a 2-axis wheel tool

Cheng

Yeung

Wang

2009

Journal of Materials Processing Technology

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“…[5][6][7][8][9][10] Therefore, new production methods have been developed to satisfy these demands. 9,[11][12][13][14][15][16][17][18] Computer-controlled polishing is one of the latest developments in overcoming the disadvantages of conventional polishing, and not only enables the manufacture of complex surfaces but also achieves high quality results and an increase in production economics. 10, 19-24…”

Section: Introductionmentioning

confidence: 99%

Advanced techniques for computer-controlled polishing

et al. 2008

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Computer-controlled polishing has introduced determinism into the finishing of high-quality surfaces, for example those used as optical interfaces. Computer-controlled polishing may overcome many of the disadvantages of traditional polishing techniques. The polishing procedure is computed in terms of the surface error-profile and the material removal characteristic of the polishing tool, the influence function. Determinism and predictability not only enable more economical manufacture but also facilitate considerably increased processing accuracy. However, there are several disadvantages that serve to limit the capabilities of computer-controlled polishing, many of these are considered to be issues associated with determination of the influence function. Magnetorheological finishing has been investigated and various new techniques and approaches that dramatically enhance the potential as well as the economics of computer-controlled polishing have been developed and verified experimentally. Recent developments and advancements in computer-controlled polishing are discussed. The generic results of this research may be used in a wide variety of alternative applications in which controlled material removal is employed to achieve a desired surface specification, ranging from surface treatment processes in technical disciplines, to manipulation of biological surface textures in medical technologies.

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ASPHERO5 - rapid fabrication of precise aspheres

Cited by 6 publications

References 0 publications

ASPHERO5 – Simulation and Analysis of Aspherical Polishing Process

ASPHERO5 – Simulation and Analysis of Aspherical Polishing Process

Experimentation on MR fluid using a 2-axis wheel tool

Advanced techniques for computer-controlled polishing

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