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Research on single point diamond turning of chalcogenide glass aspheric lens
- Source :
- Procedia CIRP. 71:293-298
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Chalcogenide glass (ChG) Ge 22 Se 58 As 20 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 Ge 22 Se 58 As 20 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 μm 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.
- Subjects :
- 010302 applied physics
Materials science
business.industry
Chalcogenide
Chalcogenide glass
02 engineering and technology
Diamond turning
021001 nanoscience & nanotechnology
01 natural sciences
chemistry.chemical_compound
Optics
Aspheric lens
chemistry
Machining
0103 physical sciences
Vickers hardness test
Surface roughness
General Earth and Planetary Sciences
0210 nano-technology
business
General Environmental Science
Surface integrity
Subjects
Details
- ISSN :
- 22128271
- Volume :
- 71
- Database :
- OpenAIRE
- Journal :
- Procedia CIRP
- Accession number :
- edsair.doi...........7e08bd9e57f74f0c28d27bd5cb4d4c5b