Glass Preform Molding with Zoned Atmosphere Control
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Solution Overview
Problem
Hot molding methods for manufacturing glass preforms often result in surface striae due to volatilization of components like fluorine and alkali metals, compromising the quality and productivity of glass lenses used in optical elements.
Innovation Solution
A device and method that independently regulate the atmosphere in different areas of the glass preform manufacturing process, such as the casting, molding, and removal areas, using mechanisms like gas feeding devices and housing covers to maintain a controlled environment, reducing volatilization and surface striae.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot molding method is used to manufacture glass preforms, then productivity is improved, but surface striae are generated due to component volatilization
Solution Approach 1:
The manufacturing process is segmented into distinct atmospheric zones: a first atmosphere is applied during glass melt casting, and a second atmosphere (different from the first) is applied during the molding process. This segmentation allows optimization of each stage independently to prevent volatilization-induced striae while maintaining high productivity
Solution Approach 2:
Different atmospheric conditions are applied to different areas of the glass melt at different stages. The atmosphere in the casting area differs from the atmosphere in the molding area, with each area receiving tailored atmospheric treatment to prevent component volatilization and surface striae formation
2Ease of manufacture
If elevated temperature is used to cause glass melt to flow, then molding process is enabled, but alkali metal or B2O3 volatization generates striae
Solution Approach 1:
An inert or controlled atmosphere is introduced during the molding process to suppress the volatilization of alkali metals and B2O3 from the glass melt. This controlled atmospheric environment prevents harmful volatile emissions while allowing the glass to flow and be molded at elevated temperatures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the production of glass preforms with reduced striae, leading to high-quality optical elements with improved productivity and optical performance.
Implementation Method 1
the fluorine in the glass reacts with the atmosphere and vaporizes when the temperature of the glass is elevated during molding
Implementation Method 2
an atmosphere to which the glass is exposed on the gob casting molds in the casting area, molding area, or removal area is independently regulated
Implementation Method 3
an area where the cast glass melt is cooled while being held on a gob casting mold to mold a glass preform
Data Source
AI summary
The devices for manufacturing glass performs comprise multiple gob casting molds, devices for displacing the gob casting molds and an atmosphere regulating mechanism. In one aspect, the atmosphere regulating mechanism independently regulates an atmosphere to which the glass is exposed on the gob casting molds in the casting area, molding area, or removal area relative to an atmosphere of at least one other area. In a second aspect, the atmosphere regulating mechanism divides the molding area into multiple subareas, and independently regulates an atmosphere to which the glass on the gob casting molds is exposed in at least one of the multiple subareas relative to the atmosphere in at least one other subarea and/or at least one other area.