Modeling high-temperature glass molding process by coupling heat transfer and viscous deformation analysis

Jiwang Yan, Tianfeng Zhou, Jun Masuda, Tsunemoto Kuriyagawa

研究成果: Article査読

91 被引用数 (Scopus)

抄録

Glass molding is as an effective approach to produce precision micro optical elements with complex shapes at high production efficiency. Since glass is deformed at a high temperature where the mechanical and optical properties depend strongly on temperature, modeling the heat transfer and high-temperature deformation behavior of glass is an important issue. In this paper, a two-step pressing process is proposed according to the non-linear thermal expansion characteristics of glass. Heat transfer phenomenon was modeled by considering the temperature dependence of specific heat and thermal conductivity of glass. Viscosity of glass near the softening point was measured by uniaxially pressing cylindrical glass preforms between a pair of flat molds using an ultraprecision glass molding machine. Based on the numerical models and experimentally measured glass property, thermo-mechanical finite element method simulation of temperature rise during heating and material flow during pressing was carried out. The minimum heating time and pressing load changes were successfully predicted.

本文言語English
ページ(範囲)150-159
ページ数10
ジャーナルPrecision Engineering
33
2
DOI
出版ステータスPublished - 2009 4 1
外部発表はい

ASJC Scopus subject areas

  • 工学(全般)

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