PROCESS FOR THE PRECISION MOULDING OF GLASS MANUFACTURED ARTICLES WITH GREAT SIZES, IN PARTICULAR LENSES

摘要

A process for the precision moulding of glass manufactured articles, in particular glass lenses with great sizes and thickness, characterized by reduced surface roughness and high geometrical precision of the shapes, providing a phase wherein one controls actively the geometry of a glass spindle with temperature higher than or equal to its working temperature by means of a mould, and wherein subsequently the temperature and the shape of the spindle during the cooling phase is controlled actively, so that the manufactured article reaches uniformly and in all its volume a single temperature Td, not lower than its glass transition temperature.

主权项

1. A process for the precision moulding of glass manufactured articles, in particular glass lenses with great sizes and thickness, characterized by a low surface roughness and high geometrical precision of the shapes, wherein one controls actively the geometry of a glass spindle with temperature higher than or equal to its working temperature by means of a mould, and wherein subsequently the temperature and the shape of the spindle during the cooling phase are controlled actively, so that the manufactured article reaches uniformly and in all its volume a single temperature Td, not lower than its glass transition temperature.