scholarly journals Numerical Simulation of Glass molding Process for Large Diameter Aspherical Glass Lens

2019 ◽  
Vol 490 ◽  
pp. 052018
Author(s):  
Kangsen Li ◽  
Feng Gong
Keyword(s):  
Numerical Simulation ◽  
Large Diameter ◽  
Molding Process ◽  
Glass Molding ◽  
Glass Lens

Numerical Simulation of Ultraprecision Glass Molding for Micro Aspherical Glass Lens

2010 ◽  
Vol 39 (11) ◽  
pp. 2020-2024 ◽  
Author(s):  
尹韶辉 YIN Shaohui ◽  
王玉方 WANG Yufang ◽  
朱科军 ZHU Junke ◽  
霍建杰 HUO Jianjie ◽  
陈逢军 CHEN Fengjun ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Glass Molding ◽  
Glass Lens

Ultraprecision Mass Fabrication of Aspherical Fresnel Lens by Glass Molding Press

2011 ◽  
Vol 325 ◽  
pp. 713-718 ◽  
Author(s):  
Tian Feng Zhou ◽  
Ji Wang Yan ◽  
Jun Masuda ◽  
Tunemoto Kuriyagawa
Keyword(s):  
High Efficiency ◽  
Fresnel Lens ◽  
Molding Process ◽  
Diamond Cutting ◽  
Glass Molding ◽  
Machining Center ◽  
Molding Condition ◽  
Glass Lens ◽  
Lens Surface ◽  
Plating Layer

Glass molding press (GMP) was applied to the fabrication of glass aspherical Fresnel lens for high-efficiency mass production. A pair of molds for the Fresnel lens was precisely fabricated on the Nickel Phosphorous (Ni-P) plating layer by the single diamond cutting with multi-axis machining center. A kind of low transition temperature (Tg) glass was heated to several tens degree centigrade above its Tg and compressed between the two molds. In this way, the shape of the mold was replicated to the glass lens surface. The molding process was simulated by finite element method (FEM), and the molding condition was optimized to minimize the residual stress.

Design of Protective Coatings for Glass Lens Molding

2007 ◽  
Vol 364-366 ◽  
pp. 655-661 ◽  
Author(s):  
Kung Jeng Ma ◽  
H.H. Chien ◽  
W.H. Chuan ◽  
Choung Lii Chao ◽  
K.C. Hwang
Keyword(s):  
High Temperature ◽  
Protective Coatings ◽  
Optical Glass ◽  
Low Cost ◽  
Interface Reaction ◽  
Molding Process ◽  
Ceramic Substrates ◽  
Glass Molding ◽  
Operation Temperature ◽  
Glass Lens

The glass molding process is considered to have a great potential for the mass production of aspherical glass lenses with high precision and low cost. However, glass molding has a serious problem of mold sticking with glass which needs to be resolved. This research investigates the interface reaction between glass and mold by high temperature wetting experiment, which provides the reference for the designing anti-stick coatings. The SUMITA K-PSK200 optical glass gobs with low Tg were used in this study. The influence of operation temperature, ambient gas, substrate materials, and thin film composition on wettability of glass at high temperature were studied. The results show that the higher the temperature, the smaller the wetting angle between glass gob and substrate could be observed. This indicates that severe interface chemical reaction occured and resulted in the loss of transparency in glass appearance. The wetting experiment in nitrogen ambient improved the sticking situation. The combination of chemically stable substrates and coatings, such as Sapphire (substrate) / GaN (film) and Glass (substrate) / Al2O3 (film) can achieve the best antistick propose. The precious metal films, such as Pt, Ir, coated on the ceramic substrates can effectively reduce the interface reaction between the glass and substrates.

scholarly journals The glass-molding process for planar-integrated micro-optical component

2011 ◽  
Vol 18 (1) ◽  
pp. 96-98 ◽  
Author(s):  
Chien-Yao Huang ◽  
Jyh-Rou Sze ◽  
Kuo-Cheng Huang ◽  
Chao-Hui Kuo ◽  
Shih-Feng Tseng ◽  
...  
Keyword(s):  
Optical Component ◽  
Molding Process ◽  
Glass Molding

Application of Orthogonal Test in Numerical Simulation of Glass Lens Molding

2012 ◽  
Vol 497 ◽  
pp. 245-249
Author(s):  
Dao Cheng Zhang ◽  
Ke Jun Zhu ◽  
Yong Jian Zhu ◽  
Shao Hui Yin ◽  
Jian Wu Yu
Keyword(s):  
Process Parameters ◽  
Orthogonal Experiment ◽  
Fem Simulation ◽  
Orthogonal Test ◽  
Test Method ◽  
Testing Time ◽  
Molding Process ◽  
Glass Lens ◽  
Lens Molding ◽  
Process Factors

Glass lens molding is a high-volume fabrication method for producing optical components. In this paper, combined with the orthogonal test method and finite element method (FEM) simulation, the coupled thermo-mechanical analysis was carried out to analyze the key process factors. In order to reduce the testing time, an orthogonal test with three sets of level factors and three parameters is conducted to obtain the optimal molding process parameters. The result shows that the most significant parameter is molding velocity, the other effect parameters are molding temperature and friction coefficient. According to the previous analysis of orthogonal experiment, it is shown that the best optimal finishing process parameters were A2B1C1.

Wafer Level Glass Molding

2012 ◽  
Vol 523-524 ◽  
pp. 1001-1005 ◽  
Author(s):  
Martin Hünten ◽  
Daniel Hollstegge ◽  
Fritz Klocke
Keyword(s):  
Wafer Level ◽  
Molding Process ◽  
Optical Components ◽  
New Approach ◽  
Glass Molding ◽  
Wafer Scale ◽  
Precision Glass Molding

Manufacturing of micro optical components is approached with many different technologies. In this paper it is presented how the precision glass molding process is enabled to manufacture micro optical components made out of glass. In comparison to the existing glass molding technology the new approach aims for molding entire glass wafers including multiple micro optical components. It is explained which developments in the filed of simulation, mold manufacturing and molding were accomplished in order to enable the precision glass molding on wafer scale.

scholarly journals Numerical Simulation Analysis of Combined Seismic Response for Rock-Lining-Water in Hydraulic Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Guoqing Liu ◽  
Yanhong Zhang ◽  
Ming Xiao
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Water Diversion ◽  
Seismic Stability ◽  
Central Difference ◽  
Element Analysis ◽  
Internal Water ◽  
Lining Structure

In order to explore the influence of internal water on the seismic response of hydraulic tunnel, the combined mechanical analysis models of multimaterial including surrounding rock, lining structure, and internal water are built. Based on the explicit central difference method, the dynamic finite element analysis methods for rock, lining, and water are discussed, respectively. The dynamic contact force method is used to simulate the rock-lining contact interaction, and the arbitrary Lagrange-Euler (ALE) method is used to simulate the lining-water coupling interaction. Then a numerical simulation analysis method for combined seismic response of rock-lining-water system in hydraulic tunnel is proposed, and the detailed solving steps are given. This method is used to study the seismic stability characteristics of the water diversion tunnel in a hydropower station, and the displacement, stress, and damage failure characteristics of the lining structure under the conditions of no water, static water, and dynamic water are comparatively analyzed. The results show that the hydrostatic pressure restricts the seismic response of the lining, while the hydrodynamic pressure exacerbates its seismic response and leads to damage, separation, and slip failure appearing on the haunch, which can provide a scientific reference for the seismic design of hydraulic tunnel with high water head and large diameter.

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