Grinding Optimization Model for Nanometric Surface Roughness for Aspheric Astronomical Optical Surfaces
Bound abrasive grinding is used for the initial fabrication phase of the precision aspheric mirrors for both space and ground based astronomical telescopes. We developed a new grinding optimization process that determines the input grinding variables for the target surface roughness, checks the grin...
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Korean Space Science Society (KSSS)
2005-03-01
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doaj-2d278bd10c674a8a88a3bf2e9548da0d2020-11-24T23:18:58ZengKorean Space Science Society (KSSS)Journal of Astronomy and Space Sciences2093-55872093-14092005-03-01221132010.5140/JASS.2005.22.1.013Grinding Optimization Model for Nanometric Surface Roughness for Aspheric Astronomical Optical SurfacesJeong-Yeol Han0Sug-Whan Kim1Geon-Hee Kim2In-Woo Han3Sun-Choel Yang4Department of Astronomy and Space Science, University of Science and Technology, Daejeon 305-333, KoreaSpace Optics Laboratory, Department of Astronomy, Yonsei Universiy, Seoul 120-749, KoreaUltra-Precision Engineering Laboratory, Korea Basic Science Institute, Daejeon 305-333, KoreaDepartment of Astronomy and Space Science, University of Science and Technology, Daejeon 305-333, KoreaUltra-Precision Engineering Laboratory, Korea Basic Science Institute, Daejeon 305-333, KoreaBound abrasive grinding is used for the initial fabrication phase of the precision aspheric mirrors for both space and ground based astronomical telescopes. We developed a new grinding optimization process that determines the input grinding variables for the target surface roughness, checks the grinding error magnitude in resulting surface roughnesses, and minimizes the required machining time. Using the machining data collected from the previous grinding runs and subsequently fed into the multi-variable regression engine, the process has the evolving controllability that suggests the optimum set of grinding variables for each target surface roughness. The process model was then used for ten grinding experiments that resulted in the grinding accuracy of <ETC> =-0.906 ± 3.38(σ) nm (Ra) for the target surface roughnesses of Zerodur substrate ranging from 96.1 nm (Ra) to 65.0 nm (Ra). The results imply that the quantitative process optimization technique developed in this study minimizes the machining time and offers the nanometric surface roughness controllability superior to the traditional, qualitative, craftsman based grinding process for the astronomical optical surfaces.http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2005/v22n1/OJOOBS_2005_v22n1_13.pdfastronomical telescopesaspheric mirrorssurface roughnessgrinding optimization process |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jeong-Yeol Han Sug-Whan Kim Geon-Hee Kim In-Woo Han Sun-Choel Yang |
spellingShingle |
Jeong-Yeol Han Sug-Whan Kim Geon-Hee Kim In-Woo Han Sun-Choel Yang Grinding Optimization Model for Nanometric Surface Roughness for Aspheric Astronomical Optical Surfaces Journal of Astronomy and Space Sciences astronomical telescopes aspheric mirrors surface roughness grinding optimization process |
author_facet |
Jeong-Yeol Han Sug-Whan Kim Geon-Hee Kim In-Woo Han Sun-Choel Yang |
author_sort |
Jeong-Yeol Han |
title |
Grinding Optimization Model for Nanometric Surface Roughness for Aspheric Astronomical Optical Surfaces |
title_short |
Grinding Optimization Model for Nanometric Surface Roughness for Aspheric Astronomical Optical Surfaces |
title_full |
Grinding Optimization Model for Nanometric Surface Roughness for Aspheric Astronomical Optical Surfaces |
title_fullStr |
Grinding Optimization Model for Nanometric Surface Roughness for Aspheric Astronomical Optical Surfaces |
title_full_unstemmed |
Grinding Optimization Model for Nanometric Surface Roughness for Aspheric Astronomical Optical Surfaces |
title_sort |
grinding optimization model for nanometric surface roughness for aspheric astronomical optical surfaces |
publisher |
Korean Space Science Society (KSSS) |
series |
Journal of Astronomy and Space Sciences |
issn |
2093-5587 2093-1409 |
publishDate |
2005-03-01 |
description |
Bound abrasive grinding is used for the initial fabrication phase of the precision aspheric mirrors for both space and ground based astronomical telescopes. We developed a new grinding optimization process that determines the input grinding variables for the target surface roughness, checks the grinding error magnitude in resulting surface roughnesses, and minimizes the required machining time. Using the machining data collected from the previous grinding runs and subsequently fed into the multi-variable regression engine, the process has the evolving controllability that suggests the optimum set of grinding variables for each target surface roughness. The process model was then used for ten grinding experiments that resulted in the grinding accuracy of <ETC> =-0.906 ± 3.38(σ) nm (Ra) for the target surface roughnesses of Zerodur substrate ranging from 96.1 nm (Ra) to 65.0 nm (Ra). The results imply that the quantitative process optimization technique developed in this study minimizes the machining time and offers the nanometric surface roughness controllability superior to the traditional, qualitative, craftsman based grinding process for the astronomical optical surfaces. |
topic |
astronomical telescopes aspheric mirrors surface roughness grinding optimization process |
url |
http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2005/v22n1/OJOOBS_2005_v22n1_13.pdf |
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