Apparatus and method for forming silica glass elements

Details Apparatus and method for forming silica glass elements Apparatus and method for forming silica glass elements

2005-08-16

2005-08-16

Griffin, Steven P. (Department: 1731)

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

C065S111000, C065S374150, C065S306000, C065S319000

Reexamination Certificate

active

06928838

ABSTRACT:
The forming apparatus has top and bottom die assemblies which form a heated silica glass material by press forming. These top and bottom die assemblies include, respectively, mold dies, which are made of isotropic carbon, and core molds, which are made of vitrified carbon. The heating and pressing time of a silica glass element, which requires a high forming temperature, is shortened by pinching the silica glass material between top and bottom core molds by controlling a torque so as to produce a close contact condition which permits heat transfer from the top and bottom core molds to the silica glass material between the top and bottom core molds.

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