Finite Element Analysis on Non-Isothermal Glass Molding

Zhu, K.; Yin, Shao Hui; Yu, Jian Wu; Zhu, Yan; Jin, Song; Wang, Yu Fang; He, Jian Jie

doi:10.4028/www.scientific.net/amr.497.240

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…As shown in Figure A, the temperature of the glass reaches about 576.5°C at t = 1 second, which is 6.5°C above its initial temperature. This temperature rise of the glass, as a direct representation of the ultrasonic thermal effect, will exert both real‐time and final impacts on the molding process, which has been demonstrated in the nonisothermal glass molding process (NGMP) . Meanwhile, it is noted from Figure B that the strain of the glass outside the mold V‐grooves is larger than the strain inside.…”

Section: Numerical Simulation Of Ugmpmentioning

confidence: 65%

Mechanism study on microformability of optical glass in ultrasonic‐assisted molding process

Luo

Nguyen

et al. 2018

Int J of Appl Glass Sci

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Ultrasonic‐assisted glass molding process (UGMP) has gained a promising start in microptics fabrication in recent years. To further understand the microforming process and comprehensively evaluate the microformability of the glass in UGMP, theoretical considerations and numerical simulations are performed in this study. A generalized dynamic viscoelastic model of glass in UGMP is first reformulated based on the ultrasonic thermo‐mechanical effects. Correspondingly, a multiphysics numerical model of UGMP is developed to dynamically observe the thermo‐mechanical rheological behaviors of the L‐BAL42 glass inside the microscale mold cavities. The stress distributions and deformation features of the formed micro‐V‐grooves in different molding processes are further employed to fully investigate the ultrasonic mechanical and thermal effects on glass molding. The results show that, as a product of the combined ultrasonic mechanical and thermal effects, the filling rate of the glass in UGMP is observably increased and homogenized, while its maximum forming stress is reduced by 57.6% compared with the conventional molding process (GMP). It is also found that, the ultrasonic thermal effect is dominant in lowering the forming stress of the glass, while the ultrasonic mechanical effect plays a leading role in homogenizing the filling rate of the glass. This study will provide both theoretical and technical supports for high‐efficiency and high‐precision fabrication of surface‐relief microptical elements.

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Section: Numerical Simulation Of Ugmpmentioning

confidence: 65%

Mechanism study on microformability of optical glass in ultrasonic‐assisted molding process

Luo

Nguyen

et al. 2018

Int J of Appl Glass Sci

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“…The principal components of the glass molding process are the glass material, molding machine, and mold insert. The main components of the molding machine are the molding chamber, heating system, and pressing unit [ 14 , 15 , 16 ]. In principle, glass molding is a direct single-step process with three major phases: heating, pressing, and cooling.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review of Micro/Nano Precision Glass Molding Molds and Their Fabrication Methods

et al. 2021

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Micro/nano-precision glass molding (MNPGM) is an efficient approach for manufacturing micro/nanostructured glass components with intricate geometry and a high-quality optical finish. In MNPGM, the mold, which directly imprints the desired pattern on the glass substrate, is a key component. To date, a wide variety of mold inserts have been utilized in MNPGM. The aim of this article is to review the latest advances in molds for MNPGM and their fabrication methods. Surface finishing is specifically addressed because molded glass is usually intended for optical applications in which the surface roughness should be lower than the wavelength of incident light to avoid scattering loss. The use of molds for a wide range of molding temperatures is also discussed in detail. Finally, a series of tables summarizing the mold fabrication methods, mold patterns and their dimensions, anti-adhesion coatings, molding conditions, molding methods, surface roughness values, glass substrates and their glass transition temperatures, and associated applications are presented. This review is intended as a roadmap for those interested in the glass molding field.

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