Modeling of plasticating injection molding - experimental assessment / C. Fernandes in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 558-569 Titre : Modeling of plasticating injection molding - experimental assessment Type de document : texte imprimé Auteurs : C. Fernandes, Auteur ; A. J. Pontes, Auteur ; J. C. Viana, Auteur ; J. M. Nóbrega, Auteur ; A. Gaspar-Cunha, Auteur Année de publication : 2014 Article en page(s) : p. 558-569 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion Matières plastiques -- Moulage par injection Modèles mathématiques Plastification Index. décimale : 668.9 Polymères Résumé : A computational model for the description of polymer flow during the plasticating phase of the injection molding process is proposed. The polymer behavior is determined during the dynamic and static phases of the process. The model takes into account the backwards movement of the screw, the presence of a non-return valve and the conduction of heat during the idle times. Results for the dynamic and static phases of the plasticization are presented. The model is also used to study the influence of some important operative process parameters, such as, screw speed, backpressure, barrel temperatures and injection chamber length. The assessment of the computational results is made experimentally by comparing the average temperature calculated with measurements made in front of the screw nozzle using both, an IR camera and an IR thermometer. The differences between the computational and the IR camera measurements are below 5%. Note de contenu : - PLASTICATING IN INJECTION MOLDING : 1. Injection cycle - 2. System geometry - 3. Operating conditions - 4. Polymer properties - MATHEMATICAL MODEL : 1. Global model - 2. Plasticating phase - 3. Stationary phase - CASE STUDY - RESULTS AND DISCUSSION : 1. Plasticating results - 2. Experimental assessment DOI : 10.3139/217.2862 En ligne : https://drive.google.com/file/d/1PKnPdBFRT5VmulZYMftvN5VzzdUn6_eu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22221 [article]

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Mold for manipulation microstructure development / C. A. Silva in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 1 (03/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 1 (03/2005) . - p. 27-34 Titre : Mold for manipulation microstructure development Type de document : texte imprimé Auteurs : C. A. Silva, Auteur ; A. M. Cunha, Auteur ; G. R. Dias, Auteur ; J. C. Viana, Auteur Année de publication : 2005 Article en page(s) : p. 27-34 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The control of microstructure development in injection molding had attracted several important studies in the recent years, being well established that the thermo-mechanical environment imposed to the polymer melt depends on the material properties, molding geometry and processing conditions. An entirely new design of an injection mold RCEM (Rotation, Compression and Expansion Mold) was developed and implemented, allowing for a wide variation of the filling and packing conditions in a flat disk geometry. One of the cavity walls (the ejection side) can rotate or move with a linear movement during the injection and holding stages. This enables several filling sequences and the variation of the cavity thickness. Two electric servomotors are use to directly drive those movements. Two temperatures and pressure sensors allow for the on-line process monitoring. Several examples of the potential uses of the RCEM are shown for the cases of amorphous and semicrystalline polymers. Results obtained with short-fiber reinforced polypropylene are also presented. DOI : 10.3139/217.1847 En ligne : https://drive.google.com/file/d/1ckYzL1g4_lY2MW-bVju_y0OVRWXDgCMB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3087 [article]

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Using multi-objective evolutionary algorithms for optimization of the cooling system in polymer injection molding / C. Fernandes in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 213-223 Titre : Using multi-objective evolutionary algorithms for optimization of the cooling system in polymer injection molding Type de document : texte imprimé Auteurs : C. Fernandes, Auteur ; A. J. Pontes, Auteur ; J. C. Viana, Auteur ; A. Gaspar-Cunha, Auteur Année de publication : 2012 Article en page(s) : p. 213-223 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algorithmes génétiques Matières plastiques -- Moulage par injection Systèmes de refroidissement Index. décimale : 668.9 Polymères Résumé : The cooling process in polymer injection molding is of great importance as it has a direct impact on both productivity and product quality. In this paper a Multi-objective Optimization Genetic Algorithm, denoted as Reduced Pareto Set Genetic Algorithm with Elitism (RPSGAe), was applied to optimize both the position and the layout of the cooling channels in the injection molding process. The optimization model proposed in this paper is an integration of genetic algorithms and Computer-Aided Engineering, CAE, technology applied to polymer process simulations. The main goal is to implement an automatic optimization scheme capable of defining the best position and layout of the cooling channels and/or setting the processing conditions of injection moldings. In this work the methodology is applied to an L-shape molding with the aim of minimizing the part warpage quantified by two different conflicting measures. The results produced have physical meaning and correspond to a successful process optimization. Note de contenu : - Development of the optimization system - Case study - Results : Analysis of modelling results - Processing conditions optimization results - Cooling channels design optimization results - Optimization with cold runners - Simultaneous processing conditions and cooling channels design optimization results DOI : 10.3139/217.2511 En ligne : https://drive.google.com/file/d/1XWEoOP36g342emr4YzfxniQiKx5VVpUz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14689 [article]

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Using multi-objective evolutionary algorithms to optimize mechanical properties of injection molded parts / A. Gaspar-Cunha in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 3 (09/2005) . - p. 274-285 Titre : Using multi-objective evolutionary algorithms to optimize mechanical properties of injection molded parts Type de document : texte imprimé Auteurs : A. Gaspar-Cunha, Auteur ; J. C. Viana, Auteur Année de publication : 2005 Article en page(s) : p. 274-285 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : An automatic optimization methodology based on Multi-Objective Evolutionary Algorithms (MOEA) is proposed to optimize the mechanical properties of injection molded products. For that purpose an MOEA is linked to a commercially available mould filling computer simulator code, CMOLD. The developed optimization methodology was applied to a practical case study where the processing conditions are optimized as a function of a desired morphological state (skin thickness, degree of crystallinity and/or level of molecular orientation; these latter are interpreted in terms of thermomechanical indices) and envisaged mechanical performance at two strain rates levels (of the order of 10–4 and 102 s1). Generally, the optimization methodology proposed is able to take into account the influence of the process parameters and produce solutions that are physically consistent. The processing conditions maximizing the morphological state of the moldings and their mechanical performance are identified. This latter is firstly maximized individually for distinct strain-rates and then a simultaneous optimization for both low and high strain-rate response is performed. The optimized sets of processing conditions leading to the maximization of the mechanical performance are analyzed by the computation of two thermomechanical indices aiming at interpreted the resultant morphological state of the moldings. DOI : 10.3139/217.1889 En ligne : https://drive.google.com/file/d/1f4p2chrT2DR-knK-W0LjnNWzUaiO_dCp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3064 [article]

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