Ultraprecision fabrication of large stamping die of Wolter mirror for an x-ray telescope by ELID grinding

Shaohui Yin; Hitoshi Ohmori; Yoshihiro Uehara; Fengjun Chen; Yongjian Zhu; Yu Wang

doi:10.1117/12.830907

20 May 2009 Ultraprecision fabrication of large stamping die of Wolter mirror for an x-ray telescope by ELID grinding

Shaohui Yin, Hitoshi Ohmori, Yoshihiro Uehara, Fengjun Chen, Yongjian Zhu, Yu Wang

Proceedings Volume 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 728229 (2009) https://doi.org/10.1117/12.830907
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

This paper presents a ultra-precision manufacturing process of large stamping dies with confocal paraboloidal and hyperboloidal surfaces of Wolter mirror for an X-ray telescope. In order to improve the alignment of the two substrates and reduce the degeneration in imaging quality, two compound reflectors were formed from one thin substrate utilizing synthetic ELID grinding and arc-enveloped grinding method. Because the thin foil substrate was obtained by press forming, large stamping dies of foil substrate must be machined with high Fig. error and low roughness. In this ELID arc-enveloped grinding system, cast iron fiber bonded (CIFB) diamond wheels were 3-dimentional controlled to scan the workpiece and generate required surfaces. Through truing grinding wheel and ELID grinding for upper concave and lower convex stamping dies, attainable form accuracy, surface roughness were investigated.

Citation Download Citation

Shaohui Yin, Hitoshi Ohmori, Yoshihiro Uehara, Fengjun Chen, Yongjian Zhu, and Yu Wang "Ultraprecision fabrication of large stamping die of Wolter mirror for an x-ray telescope by ELID grinding", Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 728229 (20 May 2009); https://doi.org/10.1117/12.830907

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KEYWORDS

Mirrors

Surface roughness

Diamond wheels

Radium

X-ray telescopes

Reflectors

Confocal microscopy

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