On the theoretical foundation for the microcutting of calcium fluoride single crystals at elevated temperatures
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2016-08-29 |
| Journal | Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture |
| Authors | Hao Wang, Annamalai Senthil Kumar, Oltmann Riemer |
| Institutions | National University of Singapore, University of Bremen |
| Citations | 14 |
Abstract
Section titled āAbstractāThe machining of a CaF 2 lens with the near-perfect crystal structure poses a more challenging task than simply performing a ductile-regime cutting on brittle materials to achieve an optical surface finish without microcracks in the subsurface layer. This research advances the understanding of the ductile-brittle transition mechanism through material characterisation. The convincing evidence for the advantage of ultraprecision diamond turning over the optical polishing process is disclosed in the comparative experimental tests. A promising solution of thermally enhanced microcutting is proposed to meet both the ubiquitous and ad hoc requirements for the fabrication of the CaF 2 lens. The theoretical foundation for the CaF 2 microcutting at elevated temperatures is for the first time established based on a semi-quantitative modelling and simulation with the crystal plasticity finite element method.