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Research on single point diamond turning of chalcogenide glass aspheric lens

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2018-01-01
JournalProcedia CIRP
AuthorsLonglong Tang, Tianfeng Zhou, Jia Zhou, Zhiqiang Liang, Xibin Wang
InstitutionsBeijing Institute of Technology
Citations12

Abstract

Section titled ā€œAbstractā€

Chalcogenide glass (ChG) Ge22Se58As20 is a significant material in infrared optical systems, and it is usually machined by ultraprecision single point diamond turning (SPDT) for aspheric lens and freeform surface. However, as a soft brittle material, the surface is easily cracked during cutting. With the increasing demand for imaging quality, the surface integrity of chalcogenide glasses becomes increasingly important. This paper proposes a method to achieve high-precision and high-efficiency aspheric lens by SPDT. First, to study the material properties, the Vickers hardness of Ge22Se58As20 is tested, and the element components and microstructure are analysed by EDS. Second, through orthogonal cutting, the critical cutting thickness of the brittle-ductile transition is tested to be 1.2 Ī¼m and the minimum depth of cut for chip formation of 100 nm is identified. The material removal rate under ductile machining in face turning was calculated. Finally, by optimizing the machining condition, an aspheric lens with surface roughness of Ra 6.47 nm and form error of PV 120.82 nm was successfully fabricated.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2010 - Barium Gallogermanate Glass Ceramics for Infrared Applications [Crossref]
  2. 2004 - Recent advances in chalcogenide glasses [Crossref]
  3. 2010 - Moulding procedure for the preparation of infrared glassy microlenses and prisms based on arsenic sulphide chalcogenide glass
  4. 1954 - The strength properties and frictional behaviour of brittle solids, Proceedings of the Royal Society of London, Series A: Mathematical and Physical Sciences [Crossref]
  5. 1977 - A model for crack initiation in elastic/plastic indentation fields [Crossref]
  6. 1990 - Ductile-Regime Machining of Germanium and Silicon [Crossref]
  7. 2013 - Scratching Experimental Research on Critical Cut Depth of Glass BK7 [Crossref]
  8. 2016 - Ductile machining of single-crystal silicon for microlens arrays by ultraprecision diamond turning using a slow tool servo
  9. 2017 - Highly efficient machining of non-circular freeform optics using fast tool servo assisted ultra-precision turning [Crossref]

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