Temperature Optimization in Multi-station Molding of Aspheric Positive Meniscus Glass Lens

ZHOU Jian; FANG Dongsheng; HUANG Baocheng

doi:10.3969/j.issn.1674-6457.2026.05.019

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (5) : 200-215. DOI: 10.3969/j.issn.1674-6457.2026.05.019

Refractory Metal Forming

Temperature Optimization in Multi-station Molding of Aspheric Positive Meniscus Glass Lens

ZHOU Jian^*, FANG Dongsheng, HUANG Baocheng

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Abstract

The work aims to investigate the optimization scheme of temperature parameters in the multi-station glass molding process with a typical positive meniscus aspheric lens as an example. A finite element simulation model tailored for a seven-station molding process was developed to analyze the thermal coupling relationships among stations and generate a scientifically valid temperature dataset. The effects of temperature parameters during the heating, molding, and cooling stages on the final lens forming quality were systematically investigated. Temperature optimization was then carried out based on the identified mechanisms. In the heating and molding stages, the molding temperature played a decisive role in determining the forming integrity of the lens. For P-SK57 glass, the minimum effective molding temperature was identified as 575 ℃, while an increase to 585 ℃ enhanced flexibility in temperature regulation. To avoid excessive thermal stress during the heating stage, the heating temperature of the first station should be maintained below 415 ℃. The temperature of the second station must exceed the glass transition temperature to effectively reduce internal stress during molding, while the third station required coordinated control with the preceding stations to ensure optimal forming outcomes. During cooling, the first station temperature should be kept below the glass transition point (493 ℃) but not lower than 455 ℃, to facilitate the release of high-temperature stress. The temperature of the second cooling station should be controlled between 245 ℃ and 325 ℃ to prevent excessive residual stress caused by rapid cooling. This study reveals the influence mechanism of temperature parameters on lens forming quality during the multi-station molding process and determines the optimal temperature ranges for each station, thereby providing theoretical guidance and process references for ensuring high-quality lens forming.

Key words

multi-station glass molding / temperature optimization / forming ratio / residual stress / viscoelasticity

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ZHOU Jian, FANG Dongsheng, HUANG Baocheng. Temperature Optimization in Multi-station Molding of Aspheric Positive Meniscus Glass Lens[J]. Journal of Netshape Forming Engineering. 2026, 18(5): 200-215 https://doi.org/10.3969/j.issn.1674-6457.2026.05.019

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