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3D Modelling of Thermal Replication for Designing Progressive Glass Moulds

New Journal of Glass and Ceramics 2013年第1期3卷 34-42页

作者： dominique lochegnies Philippe Moreau Fabienne Hanriot Patrick Hugonneaux ESSILOR International Saint- Maur-des Fosses Paris France ESSILOR International Saint- Maur-des Fosses Paris France. Pole de Recherches et d’Enseignement Supérieur Université Lille Nord de France Lille France

Worldwide, ESSILOR International provides customers with Progressive Addition Lenses (PAL), which replace bifocal lenses. Thermal replication is one process to produce glass moulds for PAL, using sagged glass on a ceramic slumping block. In this paper, thermal replication for producing PAL glass moulds is developed through 3D modelling and experimentation. Our numerical approach is validated by comparing it with experimentation on the global 3D topology of the sagged glass. It is also validated by using more severe optical comparison criteria, developed by ESSILOR International to analyze the conformity of their products. Through modelling, the thermal replication is analyzed by studying the evolving contact between the sagged glass and the ceramic slumping block during the thermal cycle and the glass flow on the upper side of the sagged glass.

关键词： Aspherical Lens Finite Element Model Precision Glass Forming Thermal Replication Metrology

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A New Way to Improve Thermal Capacities of Lubricants for the Manufacture of Flint Glass Perfume Bottles: Part B—Thermal Analysis and Physico-Chemical Observations for the Different Lubrications at the Glass/Punch Interface

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New Journal of Glass and Ceramics 2011年第3期1卷 92-104页

作者： dominique lochegnies Philippe Moreau Jean-Marc Carpentier Christine Kermel Hugues Vivier 不详

In the hollow glass industry, more specifically in the luxury perfume glass bottle industry, the success of the forming process depends on controlling the thermal exchange at the glass/mold interface to prevent defects on the glass surface. This study concerns a new way to analyze the impact of lubrication on the glass/tool thermal exchanges. It combines the thermal analysis on the experimental Glass/Tool Interaction (GTI) platform in the TEMPO Laboratory (Valenciennes, France) and the Physico-Chemical measurements on the glass samples by the BCR Center (Mons, Belgium). Part B presents the analysis of the flint glass pressing cycles using different punch lubrication conditions (i.e., bare punch, swabbed punch, coated punch, and coated/swabbed punch). The thermal analysis permits us to rank the lubrication conditions in terms of their capacity to limit the thermal exchange at the punch/glass interface. We defined a new lu- bricating paste composition based on the Physico-Chemical observations of the lubrication transfer on the pressed glass. The GTI platform results proves that the new composition does not affect the insulating power of the lubricating paste and permits us to eliminate defects on the glass samples that are not accepted in industrial situations.

关键词： Glass Forming Lubrication Pressing Heat Transfer Glass/Tool Contact Physico-Chemical Analysis

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