Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8038708 | CIRP Annals - Manufacturing Technology | 2018 | 4 Pages |
Abstract
Ophthalmic intraocular lenses are conventionally machined by diamond tools. A promising alternative approach is contour cutting by ultrashort pulsed laser micromachining. To improve process knowledge, a parametric study of picosecond and femtosecond laser machining of medical grade hydrophilic copolymers and PMMA is carried out. Material removal rates and machining quality with respect to main process parameters are determined. Reasons for chipping and formation of heat affected zones are identified and an optimized process strategy is derived. By choosing a defined pulse overlap, heat accumulation is kept minimal while increasing absorptivity through incubation avoids chipping.
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Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
Johannes Heberle, Tom Häfner, Michael Schmidt,