| Autor: |
S. V. Grubyi, S. N. Titov, V. V. Lapshin |
| Jazyk: |
ruština |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Mašiny i Ustanovki: Proektirovanie, Razrabotka i Èkspluataciâ, Vol 0, Iss 2, Pp 29-41 (2017) |
| Popis: |
Components of optical systems for various purposes include optical elements with structured surfaces, i.e. linear and circular Fresnel lenses. The objective of the conducted studies is to analyse design parameters and technological development of modes and conditions to ensure manufacturing circular Fresnel lenses with specified technology requirements.The subject of the study is a circular Fresnel lens, which has a thickness of 2 mm and a diameter of 76.7 mm; its processed profile consists of 126 concentric rings with a valley pitch equal to 0.3 mm. The profile depth of the rings varies from 2.1μm to 337.4μm, with the profile angle varying from 0.406 ° to 48.361 °. The lens material is polymethyl methacrylate (PMMA) - a tough amorphous polymer, which has high transparency, weather resistance, good physical-mechanical and electrical insulating properties.The article presents the results of applied research related to diamond machining of a Fresnel circular lens. Substantiates that there is a need to use an ultra-precise machine for lens processing and gives its main technical characteristics.The design features and recommended domestic and foreign diamond mono-crystalline cutters for preliminary and finishing processing of structured surfaces, including Fresnel lenses are analysed.The technology of diamond edge cutting machining of lenses is proposed, the modes and conditions of diamond turning to exclude finning are given.The results of metrological control have confirmed the requirements for the profile accuracy and the roughness of surfaces machined. The JSC "VNIIINSTRUMENT" has implemented the developed technology on the ultra-precise specialised NC machine and recommended its use in machining the structured plexiglass surfaces of various sizes for different purposes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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