Development of a BD-PCD wheel-tool and research of diffractive echelle grating mould machining
| Autor: | Wu, Yu-Ru, 吳育儒 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 The main purpose of the thesis is to develop a technique of inclined high-speed &; fast shallow grinding and use in generation of diffractive echelle grating mold to enhance the processing efficiency and decrease the cost for grating mold production. First, a wheel-tool made of boron-doped polycrystalline composite diamond with a sharp corner is schemed and machined. A spring collet which possesses a taper of 1:4 is designed to provide for assembly auto-center between the tool and shank. To avoid the corner wear of wheel-tool during forming, a strategy of sacrificial electrode employed is proposed. This is helpful in making a uniform electric field and suppressing localization at tool-end region to obtain more accurate machining. In addition, a set of inclined clamping mechanism which can stably locate a high-speed spindle to guide the wheel-tool to grind along the blaze angle of grating is developed. A co-direction grinding, in which grinding is carried out along long side of grating and normal direction of blaze plane is proposed to restrain burrs from occurrence. Experimental results demonstrate that the inclined high-speed &; fast shallow grinding with co-direction grinding can generate micro grating array with grating constants of 2.75, 4.0 and 8.0 µm, respectively. These machined diffractive echelle grating array can really achieve the separation of light for different wavelengths. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|