scholarly journals A Study on the Molding Process of an Optical Communication Aspherical Glass Lens Using the Weight Molding Method

Ceramist ◽  
2018 ◽  
Vol 21 (4) ◽  
pp. 427-432
Author(s):  
Sang Ryu ◽  
Kyung Hwan Roh ◽  
Kwang Hyeon Choi ◽  
Won Guk Kim ◽  
Won Kyung Lee ◽  
...  
Keyword(s):  
Optical Communication ◽  
Molding Process ◽  
Molding Method ◽  
Glass Lens

Precision Grinding of Structured Tungsten Carbide Mold

2012 ◽  
Vol 497 ◽  
pp. 15-19 ◽  
Author(s):  
Hirofumi Suzuki ◽  
Tatsuya Furuki ◽  
Mutsumi Okada ◽  
Yutaka Yamagata ◽  
Shinya MORITA
Keyword(s):  
Tungsten Carbide ◽  
Power Efficiency ◽  
Fresnel Lens ◽  
Rare Metal ◽  
Diamond Wheel ◽  
Precision Grinding ◽  
Form Accuracy ◽  
Molding Method ◽  
Grinding Method ◽  
Glass Lens

Demands of glass Fresnel lens is increasing in solar panel in order to increase power efficiency. Glass lens is usually molded by glass molding method with tungsten carbide molds. In this study, large Fresnel lens molds made of tungsten carbide are tested to be ground by simultaneous 2-axis (Y, Z) controlled grinding method. The resinoid bonded diamond wheel was trued with a rare metal truer to improve the sharpness of the wheel edge. In the grinding test of the tungsten carbide mold, a form accuracy of less than 0.8 μm P-V and surface roughness of 18 nm Rz were obtained, and it is clarified that the proposed grinding method is useful for the Fresnel grinding.

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.

Numerical Evaluation on the Curve Deviation of the Molded Glass Lens

2014 ◽  
Vol 136 (5) ◽  
Author(s):  
Jian Zhou ◽  
Mujun Li ◽  
Yang Hu ◽  
Tianyi Shi ◽  
Yueliang Ji ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Good Reason ◽  
Processing Parameters ◽  
Forming Process ◽  
Molding Process ◽  
Contact Heat ◽  
Thermal Boundary Conditions ◽  
Glass Lens ◽  
Final Profile ◽  
Relationship Of

The compression molding of precision glass lens is a near net-shape forming process for optical components fabrication. The final profile curve accuracy is one of the most crucial criterions for evaluating the quality of the molded lens. In this research, our purpose was focused on the evaluation of the molded lens curve deviation. By incorporating stress relaxation and structural relaxation model of glass, numerical simulations of the whole molding process for fabricating a planoconvex lens were conducted by utilizing the commercial software msc Marc. The relationship of the three variables, i.e., the lens curve deviation, the mold curve deviation, the gap between the lens and the lower mold, was discussed and the evolution plots with time of the three variables were obtained. Details of the thermal boundary conditions were discussed by considering the contact heat transfer behavior. Then the essentiality of a small gap between the molds and the molded lens after releasing the upper mold was demonstrated. In details, the sensitivity analysis of the processing parameters was conducted, such as the releasing temperature, the cooling rate in the annealing and fast cooling stage, respectively, and the magnitude of the hold-up force. The results showed that the glass lens curve deviation was not sensitive to the choices of the releasing temperature and the cooling rate. What's more, the results indicated that the curve deviation decreased with the hold-up force increasing. Finally, with all the details considered, the final simulation results were presented accurately with good reason.

Powder Injection Molding of Copper and the Effect of Sintering Temperature on Its Mechanical Properties

2010 ◽  
Author(s):  
Ali Keshavarz Panahi ◽  
Hossein Khoshkish
Keyword(s):  
Injection Molding ◽  
Copper Powder ◽  
Sintering Temperature ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Injection Molding Process ◽  
Capillary Rheometer ◽  
Molding Process ◽  
Molding Method ◽  
Different Temperatures

In this article, the fabrication steps of copper parts, using the powder injection molding method have been investigated. For the purpose of this study, first, several feedstocks were prepared by mixing copper powder (in volume percentages of 60, 64, 68, and 72%) and a thermoplastic binder. Due to the sensitivity of the mixing stage in the powder injection molding process, the Extrumixing method was utilized to appropriately mix the copper powder with the binder. Rheological characteristics of the different feedstocks were analyzed by means of a capillary rheometer. Based on this analysis, the feedstock having a 68 vol. % copper powder was selected as the optimum powder, out of which, samples shaped like tensile test specimens were successfully molded. These samples were later debinded by the solvent debinding method. Sintering of the pieces was carried out at different temperatures. Research showed that raising the sintering temperature leads to an increase of density and tensile strength of the specimens.

Car Progressive Stamping Molding Process Simulation and Process Optimization

2014 ◽  
Vol 971-973 ◽  
pp. 414-417
Author(s):  
Yao Guo Liu
Keyword(s):  
Numerical Simulation ◽  
Process Simulation ◽  
Analysis Method ◽  
Molding Process ◽  
Element Analysis ◽  
Sheet Metal Stamping ◽  
Molding Method ◽  
Finite Element Analysis Method ◽  
Simulation Techniques ◽  
Metal Stamping

Based on the beam outside the front car plate , for example, to use DYNAFORM software for finite element analysis method to start the process of drawing molding method, the research body stamping design and formability analysis. Numerical simulation techniques for forming sheet metal stamping simulation .

scholarly journals Study on High-Temperature Glass Lens Molding Process Using FEM Simulation

2015 ◽  
Vol 9 (1) ◽  
pp. 14-19
Author(s):  
Zhang Xiaobing ◽  
Yin Shaohui
Keyword(s):  
High Temperature ◽  
Fem Simulation ◽  
Maxwell Model ◽  
Relaxation Curve ◽  
Model Parameters ◽  
Molding Process ◽  
Promising Alternative ◽  
Complex Shapes ◽  
Generalized Maxwell Model ◽  
Glass Lens

The glass molding process (GMP) can press glass perform into a shape of finished lens under high pressure and temperature conditions, and it is easy to achieve mass production. So, it has emerged as a promising alternative way to produce complex shapes lens. It is well known that viscoelastic is one important properties of glass at high temperature. In this study, A 4-pair generalized maxwell model was used to express viscoelastic of glass, and model parameters were obtained by fitting the relaxation curve obtained from experiment. The finite element models were established by MSC.MARC, the correctness of the FEM models and its used model parameters were verified by the cylindrical compression experiments. Finally, the simulations of glass lens forming stage were performed under different conditions. Stresses distribution were predicted by FEM, it was found that the maximum stress at the edge of lens, which make lens rupture easily at this zone. It was also discovered that the molding temperature is higher, the less stress, and the molding velocity is higher, the higher stress.

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.

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