Method of mutually positioning a pair of shaping-tool halves...

Details Method of mutually positioning a pair of shaping-tool halves... Method of mutually positioning a pair of shaping-tool halves...

B - Operations, Transporting

29

C

B29C 33/38 (2006.01) B29C 33/30 (2006.01) B29D 11/00 (2006.01)

Patent

CA 2249279

Proposed is a shaping tool for manufacturing precision-made articles, in particular contact lenses, said shaping tool comprising two halves fitted with inserts (18, 38) and with a cavity (50) between them. The tool is made of ceramic glass with negligible thermal expansion in a given work range. On each side of the cavity (50) is a ceramic-glass insert which defines the shape of the part being manufactured and which is positively held round its circumference in a positioning plate (16, 36) also made of ceramic glass. The positioning plates (16, 36) are each mounted on a ceramic-glass mounting plate (14, 34).

L'invention concerne un moule pour la fabrication de pièces de précision, notamment de lentilles de contact, ledit moule comprenant deux parties formant une cavité (50), et deux inserts (18, 38). Ce moule est réalisé dans un matériau vitrocéramique présentant un allongement thermique négligeable dans une plage de travail donnée. Sur chaque côté de la cavité (50) est prévu un insert (18, 38) en vitrocéramique qui détermine la forme de la pièce de précision à fabriquer et est maintenu par liaison de forme au niveau périphérique, dans une plaque de positionnement (16, 36), également en vitrocéramique. Les plaques de positionnement (16, 36) sont placées chacune sur une plaque de support (14, 34) en vitrocéramique.

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