Description : | Application of Diamond turned optical components are limited to infrared optics owing to residual turning marks and induced subsurface damage. This situation demands some flexible finishing processes to achieve desired surface finish on diamond turned components. Shape adaptive grinding (SAG), magnetorheological finishing (MRF), and elastic abrasive finishing (EAF) have been extensively used for ultra-high finishing of optical components. These processes are comprehensively investigated over the wide range of materials such as silicon, copper, titanium-based alloy, hard HVOF sprayed coatings, etc. In most of the cases, the areal surface roughness (Sa) is reduced to less than 5 nm. It is perceived that the mirror level finishing can be obtained on optical material using any or the combination of the above processes. A systematic experimental investigation is being carried out to understand the surface generation mechanism. Theoretical and parametric studies are being carried out and to identify the suitable process for different shape, size and types of materials. |