3D Modelling of Thermal Replication for Designing Progressive Glass Moulds

Lochegnies, Dominique; Moreau, Philippe; Hanriot, Fabienne; Hugonneaux, Patrick

doi:10.4236/njgc.2013.31006

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…Because the progressive addition lens is a freeform surface with variable radius of curvature, complex geometry, the traditional processing methods are difficult to achieve the designed requirements. In recent years, a large number of scholars have proposed a new processing method, such as glass molding [3] and plastic injection molding [4,5] , fast tool servo [6] , and slow slide servo [7] processing etc. The injected process has the advantages of high efficiency, low cost and is suitable for mass production.…”

Section: Introductionmentioning

confidence: 99%

Study on optical freeform surface manufacturing of progressive addition lens based on fast tool servo

Cai

Xiao³

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Progressive addition lens (PAL) is currently the state-of-the-art in multifocal correction visual for freeform lens. The PAL is used to correct presbyopia by the distributing optical powers of the three zones, which are far zone, near zone and intermediate zone. As the dioptre of progressive zone varies continuously, the lenses realize simultaneously far view and near view by a pair of glasses. Because the PAL is a freeform surface with a variable radius of curvature, complex shape, processing difficulties, low efficiency, big fluctuation of interpolation error and so on. In this paper, the design surface is discretized by the constant angle method and compensates the path of the diamond tool nose radius with AKIMA interpolation method, which can identify the machine tool of the tool locus, and exploitable fast tool servo technology controls the diamond tools movement and path. MATLAB simulation results show that this method is generally more approximate to the ideal trajectory, which is not only to ensure that surface profile accuracy, but also meet the requirements of the processing efficiency and better control the surface profile.

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Section: Introductionmentioning

confidence: 99%

Study on optical freeform surface manufacturing of progressive addition lens based on fast tool servo

Cai

Xiao³

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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“…The glass viscosity, which governs the glass flow during the forming process, is strongly dependent on the temperature [1][2] and the contact with the moulds along with the constant geometry changes alters significantly the heat transfer process. The final product thickness distribution is one of the aspects which is more affected by changing process conditions [2,[4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Integrated thermomechanical model for forming of glass containers

et al. 2016

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Abstract. In this work an integrated model for all the process of glass forming of glass containers is presented. The model addresses press-and-blow and blow-and-blow procedures from the gob forming to the final product. Glass forming involves coupled thermal-mechanical physical phenomena, in which the material viscous flow is highly dependent on heat transfer which, in turn, is dependent changes of shape due to material flow. Numerical aspects associated with the model implementation and its validation with real formed products are discussed.

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“…A slumping mold is the mold which is used for forming slumped glass at 700-800 °C [1][2][3]. The desired properties for slumping molds are high thermal shock resistance, low coefficient of thermal expansion, proper thermal stability and high porosity [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Alumina Source and Soaking Time on Properties of Refractory Mortar Using as Slumping Mold

Nawaukkaratharnant

Wiratphinthu²,

Nilpairach

et al. 2014

KEM

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Slumping molds or sagging molds are utilized for shaping glassware containers and many kinds of slumped glass products from glass plates. In Thailand, a large number of slumped glass factories use such molds in their production because slumping process is easy and cheap; however, the major cost of this process is slumping molds. They are imported from other countries and are expensive. In this research, slumping molds are created from local raw materials using the basic method to reduce the cost of the production. One of proper materials for making slumping mold is refractory mortar which can be easily formed into various shapes and sizes. Consequently, it is interesting to prepare slumping molds from refractory mortar. In this study, the effect of different sources of alumina (calcined alumina and aluminum sludge) and soaking time on the properties of the refractory mortar were investigated. Dolomite clay, milled sand and white portland cement were mixed with sources of alumina in distilled water to form pastes. Super plasticizer was added to the pastes to adjust flow ability. Plastic containers were used as molds for specimen forming. Specimens were cured at room temperature for 24 hours and dried in air for 24 hours. After that specimens were dried in an oven at 110 °C for 24 hours and then fired at 1100 °C. The result showed that the suitable condition for making slumping mold is to use calcined alumina as a source of alumina with soaking temperature of 1100 °C for 4 hours. The physical properties, chemical properties and thermal properties were discussed.

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3D Modelling of Thermal Replication for Designing Progressive Glass Moulds

Cited by 7 publications

References 12 publications

Study on optical freeform surface manufacturing of progressive addition lens based on fast tool servo

Study on optical freeform surface manufacturing of progressive addition lens based on fast tool servo

Integrated thermomechanical model for forming of glass containers

Effect of Alumina Source and Soaking Time on Properties of Refractory Mortar Using as Slumping Mold

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