Process evaluation and optimization for freeform precision glass molding

Gurganus, Dustin; Novak, Spencer; Symmons, Alan; Davies, Matthew A.

doi:10.1117/12.2568958

Cited by 4 publications

(1 citation statement)

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“…Vehicle glass component 1454 × 161 × 2 mm 9.03 Yes Smartphone 3D curved screen [27] 148 × 73 × 0.35 mm 2.03 No Fingerprint lock glass panel [30] 348 × 66.6 × 2 mm 5.23 No Mobile display obtuse glass component [31] Φ = 14 mm; h = 7 mm 1 No Alvarez lens [32] Φ = 84 mm; h = 1 mm 1 Yes Aspherical glass component [33] 13 × 3.5 × 1 mm 3.71 No…”

Section: Glass Components Dimension Aspect Ratio Irregularmentioning

confidence: 99%

Simulation and Experimental Study on the Precision Molding of Irregular Vehicle Glass Components

Chen,

Hu,

Zhang

et al. 2023

Micromachines

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The high level of stress and dimension deviation induced by glass molding are the main causes of the low yield rate of large, irregular glass components on vehicles. To solve this issue, a numerical model of large glass component molding was established in this study, which aimed to analyze the dominant factors of molding quality and achieve a synergistic balance between quality characteristics and energy consumption. The results show that molding temperature is the dominant factor affecting the energy consumption and residual stress, and the molding pressure is the main factor affecting the dimension deviation. Furthermore, the NSGA-II optimization algorithm was used to optimize the maximum residual stress, dimension deviation, and energy consumption with the numerical results. The combination of a heating rate of 1.95 °C/s, holding time of 158 s, molding temperature of 570 °C, molding pressure of 34 MPa, and cooling rate of 1.15 °C/s was determined to be the optimized scheme. The predictive error of the numerical result, based on the optimized scheme, was experimentally verified to be less than 20%. It proved the accuracy of the model in this study. These results can provide guidance for the subsequent precision molding of large, irregular glass components.

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Section: Glass Components Dimension Aspect Ratio Irregularmentioning

confidence: 99%

Simulation and Experimental Study on the Precision Molding of Irregular Vehicle Glass Components

Chen,

Hu,

Zhang

et al. 2023

Micromachines

View full text Add to dashboard Cite

show abstract

The design of blend radii for precision glass molded lenses

Symmons

2022

Polymer Optics and Molded Glass Optics: Design, Fabrication, and Materials 2022

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Precision glass molding technology for XY polynomial freeform optical elements with simulations and experiments

Zhang,

Liu,

et al. 2024

Opt. Express

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Precision glass molding (PGM) technology, as an effective method for mass-producing glass lenses, is relatively mature in the molding process of aspheric lenses, but the glass molding technology for freeform optical elements is still in its infancy. For freeform optical elements, processing by conventional ultra-precision methods requires multiple processes and the resulting costs are high, while processing by PGM is efficient and inexpensive. Therefore, this paper investigates the molding technology of freeform lenses, the pre-compensation model of the freeform mold core is established, and predicts the residual stresses of freeform lenses after molding by the finite element method. Three different process parameters, molding temperature, molding rate and molding force, are verified. Experimental and simulation results show that the trends of residual stresses for the three process parameters are consistent. The optimal process parameters of the molding process are determined, under which the PV value of the molding lens is around 1.5µm. The experimental results show that the PV value of the molded lens is reduced to less than 1µm after using the pre-compensated mold core, which proves the validity of the pre-compensated model.

show abstract

Process evaluation and optimization for freeform precision glass molding

Cited by 4 publications

References 0 publications

Simulation and Experimental Study on the Precision Molding of Irregular Vehicle Glass Components

Simulation and Experimental Study on the Precision Molding of Irregular Vehicle Glass Components

The design of blend radii for precision glass molded lenses

Precision glass molding technology for XY polynomial freeform optical elements with simulations and experiments

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