Experimental study of glass molding process and transcription characteristics of mold surface in molding of aspheric glass lenses

Hwan, Du; Park, Heung Su; Hwang, Yeon; Kim, Jeong-Ho; Kim, Hyejeong

doi:10.1007/s10043-011-0049-4

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…With the increase of temperature, the relaxation modulus of glass becomes very fast. The change of glass relaxation modulus with temperature in the same coordinate system at different temperatures is shown in Figure 4 [25][26][27]. The abscissa is time t, the ordinate is the ratio of stress relaxation modulus ψ (T), T 1 and T 2 are different stress relaxation temperatures and T R is the reference temperature.…”

Section: Heat Flow Characteristicsmentioning

confidence: 99%

Study on Mechanism of Glass Molding Process for Fingerprint Lock Glass Plates

Ming

Jia

Huang³

et al. 2021

Crystals

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Curved glass is widely used in 3C industry, and the market demand is increasing gradually. Glass molding process (GMP) is a high-precision, high-efficiency 3D glass touch panel processing technology. In this study, the processing parameters of fingerprint lock glass panels were deeply analyzed. This paper first introduces the molding process of the glass panel, discusses the glass forming device, and explains the heat conduction principle of the glass. Firstly, it introduces the forming process of the glass panel, discusses the glass forming device, and explains the heat conduction principle of the glass. Secondly, the simulation model of a fingerprint lock glass plate was simulated by MSC. Marc software. The stress relaxation model and structure relaxation model are used in the model, and the heat transfer characteristics of glass mold are combined to accurately predict the forming process of glass components. The effects of molding temperature, heating rate, holding time, molding pressure, cooling rate and other process parameters on product quality characteristics (residual stress and shape deviation) were analyzed through simulation experiments. The results show that, in a certain range, the residual stress is inversely proportional to the bending temperature and heating rate, and is directly proportional to the cooling rate, while the shape deviation decreases with the increase of temperature and heating rate. When the cooling rate decreases, the shape deviation first decreases and then increases. Furthermore, a verification experiment is designed to verify the reliability of the simulation results by measuring and calculating the surface roughness of the formed products.

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Section: Heat Flow Characteristicsmentioning

confidence: 99%

Study on Mechanism of Glass Molding Process for Fingerprint Lock Glass Plates

Ming

Jia

Huang³

et al. 2021

Crystals

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“…Despite industrial demands, studies on the GMP process are mostly focused on research for optical lenses with aspheric geometry [ 19 , 21 , 22 , 23 , 24 , 25 , 26 ] or the implementation of micro-/nano-patterns [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. Zhang et al [ 6 ], Kuang et al [ 35 ], and He et al [ 36 ] conducted studies on the GMP process for molding curved glass to achieve a curvature beyond that of the 2.5D cover glass.…”

Section: Introductionmentioning

confidence: 99%

Two-Step Glass Molding Process for Forming Glass Edges with Obtuse Angles for Mobile Displays

Park

Chang²,

Lee

et al. 2022

Micromachines

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The domain of edge displays with 2.5D or 3D curved designs has been expanded to improve user convenience. The currently available 3D cover glass offers a limited curvature radius of at least 5 mm and a curvature less than 88°, due to limitations in the undercuts and formability of parts. The development of a full 3D cover, applicable to next-generation displays, requires cover glass molding technology with a curvature exceeding 90°. Here, a mold design and molding process, which addresses the current limitations by dividing the existing glass molding press (GMP) process into two stages, is proposed. The bending geometry of the glass prepared on the basis of the proposed mold design plan during single-step compression forming and two-step compression forming was predicted using commercial analysis software. A molding product with a curvature radius of 2.5 mm and an angle of curvature of 138.9° was produced when process conditions with bending by up to 180° with no damage were applied during actual forming experiments. Further research on annealing and cooling processes of GMP is expected to enable the design and process implementation to manufacture curved glass with a single curvature of at least 90° and multiple curvatures.

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“…Chalcogenide glasses are formed by melting chalcogen elements (S, Se, Ge, Sb, Te etc). These glasses materials have a unique optical transmittance from ~1 to 18 μm [1] Among various composition in chalcogenide glasses, Ge-Sb-Se systems have received since they are good transmitters in the range of 2-16 μm [2] and are feasible to fabricate IR lenses with aspherical optical geometries using mold press methods [3]. In addition, mold press techniques have been proved as a cost-effective method to produce IR lenses for mass production.…”

Section: Introductionmentioning

confidence: 99%

Development of chalcogenide glass with thermal stability for molded infrared lens

et al. 2014

Self Cite

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Chalcogenide glasses have been attracted because of their use in moldable lenses for the application in range of 3-12 μm.In this study, amorphous Ge-Sb-Se chalcogenide was prepared by a standard melt-quenching technique for moldable lens.Moldable lens should have unique thermal mechanic properties in order to be applied to molding process. Thus, the optical and thermal properties to find out right composition were characterized by IR transmission spectroscopy and DSC, respectively. Specifically, the Ge:Sb ratio were controlled in order to find out the most stable glass forming area.The relations between thermal properties and the moldability were studied by using an optical microscopy in term of thermal properties such as Tg and Tx. Transcription properties of the surface of lens or molds were explained in terms of thermal properties in their composition The preferential Ge:Sb ratio in Ge-Sb-Se based chalcogenide glasses was selected for producing moldable lens.

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Experimental study of glass molding process and transcription characteristics of mold surface in molding of aspheric glass lenses

Cited by 13 publications

References 10 publications

Study on Mechanism of Glass Molding Process for Fingerprint Lock Glass Plates

Study on Mechanism of Glass Molding Process for Fingerprint Lock Glass Plates

Two-Step Glass Molding Process for Forming Glass Edges with Obtuse Angles for Mobile Displays

Development of chalcogenide glass with thermal stability for molded infrared lens

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