Proceedings of the KSME Conference (대한기계학회:학술대회논문집)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지

A study of metal aspheric reflector manufacturing in diamond turning machine

다이아몬드 터닝머신을 이용한 금속 비구면 초정밀 절삭특성

  • 김건희 (한국기초과학지원연구원) ;
  • 도철진 (한국기초과학지원연구원) ;
  • 홍권희 (한국기초과학지원연구원) ;
  • 유병주 (한국기초과학지원연구원) ;
  • 원종호 (충남대 기계공학과) ;
  • 김상석 (조선대 기계공학과 대학원)
  • Published : 2001.06.27
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Abstract

A 110 mm diameter aspheric metal secondary mirror for a test model of an earth observation satellite camera was fabricated by ultra-precision single point diamond turning (SPDT). Aluminum alloy for mirror substrates is known to be easily machinable, but not polishable due to its ductility. A harder material, Ni, is usually electrolessly coated on an Al substrate to increase the surface hardness for optical polishing. Aspheric metal secondary mirror without a conventional polishing process, the surface roughness of Ra=10nm, and the form error of $Ra={\lambda}/12({\lambda}=632nm)$ has been required. The purpose of this research is to find the optimum machining conditions for reflector cutting of electroless-Ni coated Al alloy and apply the SPDT technique to the manufacturing of ultra precision optical components of metal aspheric reflector.

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