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Multi-objective optimization of injection molding process parameters based on BO-RFR and NSGAII methods / Yanli Cao in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 1 (2023)
[article]
Titre : Multi-objective optimization of injection molding process parameters based on BO-RFR and NSGAII methods Type de document : texte imprimé Auteurs : Yanli Cao, Auteur ; Xiying Fan, Auteur ; Yonghuan Guo, Auteur ; Wenjie Ding, Auteur ; Xin Liu, Auteur ; Chunxiao Li, Auteur Année de publication : 2023 Article en page(s) : p. 8-18 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des
Gauchissement (matériaux)
Matières plastiques -- Moulage par injection
Optimisation multi-objectifL'optimisation multiobjectif (appelée aussi Programmation multi-objective ou optimisation multi-critère) est une branche de l'optimisation mathématique traitant spécifiquement des problèmes d'optimisation ayant plusieurs fonctions objectifs. Elle se distingue de l'optimisation multidisciplinaire par le fait que les objectifs à optimiser portent ici sur un seul problème.
Les problèmes multiobjectifs ont un intérêt grandissant dans l'industrie où les responsables sont contraints de tenter d'optimiser des objectifs contradictoires. Ces problèmes peuvent être NP-difficiles. Leur résolution en des temps raisonnables devient nécessaire et alimente une partie des chercheurs travaillant dans la recherche opérationnelle. (Wikipedia)
Retrait volumiqueTags : 'Régression forestière aléatoire optimisée bayésienne (BO-RFR)' 'Optimisation multi-objectifs' 'Moulage par injection plastique (PIM)' Index. décimale : 668.4 Plastiques, vinyles Résumé : Injection molding of thin-walled plastic parts with minimum deformation in warpage and volume shrinkage is crucial for part quality. Simulation combined Latin hypercube sampling approach was used to research the effects of different process parameters on deformation. Then, random forest regression (RFR) is used to construct the mathematical relationship between process parameters and defects, such as warpage and volume shrinkage. The gaussian process is used as probabilistic surrogate model, while the probability of improvement is used as acquisition function to construct a Bayesian optimization for RFR’s hyperparameters, and the performance of random search is compared. In addition, the gradient boosting regression (GBR) and support vector regression (SVR) were also adopted to establish the prediction models, respectively. Comparing all the above prediction models, it can be found that the Bayesian optimized random forest regression (BO-RFR) has the highest accuracy. The Non-dominated Sorting Genetic Algorithm-II (NSGA-II) is interfaced with the predictive models to find the optimum design parameters for the purpose of effectively predicting and controlling warpage and volume shrinkage. The results show that warpage is reduced by 66.03% while volume shrinkage is 46.20% after optimizing. The final finite element simulation and physical tests indicate that this proposed method can effectively achieve the multi-objective optimization of injection molding. Note de contenu : - FINITE ELEMENT SIMULATION ANALYSIS AND OPTIMIZATION STRATEGY : Finite element model - Latin hypercube sampling - Multi-objective optimization strategy
- BO-RFR : RFR - BO - BO-RFR - Evaluation
- MULTI-OBJECTIVE OPTIMIZATION : NSGA-II - Multi-objective optimization through NSGA-II - Trade-off analysis
- VERIFICATION OF THE OPTIMIZATION RESULTS : Finite element simulation verification - Experimental verification
- Table 1 : Range of design parameters
- Table 2 : LHS and simulation results
- Table 3 : Optimal hyperparameters
- Table 4 : Evaluation of different models
- Table 5 : Verification of optimal process parameters
- Table 6 : Results of measurements of warpage and volume shrinkageDOI : https://doi.org/10.1515/ipp-2020-4063 En ligne : https://drive.google.com/file/d/1HWBGIG1npEvYy42X7mOUp9Suq4mZMAhV/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39190
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Code-barres Cote Support Localisation Section Disponibilité 24052 - Périodique Bibliothèque principale Documentaires Disponible Les débuts de l'injection-eau in PLASTIQUES & ELASTOMERES MAGAZINE, N° 54-4 (05/2002)
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Titre : Les débuts de l'injection-eau Type de document : texte imprimé Année de publication : 2002 Article en page(s) : p. 69-70 Langues : Français (fre) Tags : 'Recherche développement' 'Condition mise en œuvre' 'Haute pression' Injection eau' 'Moulage injection' 'Forme creuse' Thermoplastique Index. décimale : 668.4 Plastiques, vinyles Résumé : Après des développements démarrés en 1999 par l'IKV (Institut für Kunststoffverarbeitung), l'injection-eau fait timidement son apparition sur le marché, en permettant, entre autres, des réductions de temps de refroidissement. Constructeurs de machines, producteurs de matière et transformateurs voient dans cette technique de nouvelles perspectives pour les matières plastiques. Note de contenu : - UNE TECHNIQUE SPÉCIFIQUE
- DES AVANTAGES CERTAINSPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14265
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Code-barres Cote Support Localisation Section Disponibilité 000872 - Périodique Bibliothèque principale Documentaires Disponible 000873 - Périodique Bibliothèque principale Documentaires Disponible Effect of mold temperature on structure and property variations of PBT injection moldings in the thickness direction / M. Shibaya in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 3 (09/2004)
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Titre : Effect of mold temperature on structure and property variations of PBT injection moldings in the thickness direction Type de document : texte imprimé Auteurs : M. Shibaya, Auteur ; C. Nonomura, Auteur ; N. Yoshihara, Auteur ; K. Yamashita, Auteur ; H. Ishibara, Auteur Année de publication : 2004 Article en page(s) : p. 303-307 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Injection molding Polybutylene terephthalates Microstructure Modulus of elasticity Tensile tests Crystallization Moldings Index. décimale : 668.9 Polymères Résumé : During injection molding process, the surface of flowing resin in contact with the mold surface is cooled first followed by the cooling of inner part. This results in the variation of microstructure in moldings through the thickness direction. It has been reported that these phenomena result in the layered structure of injection moldings. Particularly, because of the rapid rate of crystallization, PBT injection moldings have well-defined skin and core layers. The purpose of this study is to investigate the effect of mold temperature on the development of structure and property variations of PBT injection moldings in the thickness direction. Tensile tests were performed using
dumbbell specimens that were stamped out from the sliced specimens of moldings. Neck phenomenon occurred irrespective of mold temperature and distance from the surface of moldings. The start point of neck propagation shifted to higher strain with increasing distance from the surface. Tensile modulus increased with increasing distance from the surface. In order to discuss these results from a structural viewpoint, the microstructure of each layer was evaluated by density, wide-angle X-ray diffraction and Fourier transform infrared absorption measurements. The delay in necking start points with increasing distance from the surface is due to the higher crystallinity of the inner layer compared to that of the layer near the surface. Two crystal forms of PBT ( alpha- and béta-forms) were developed in injection moldings. The region near the surface, where content of alpha-form is larger than that of béta-form, becomes thinner with increasing mold temperature. It is known that the crystal modulus of alpha-form is lower than that of béta-form. Therefore the portion of moldings with lower tensile modulus and yield strength becomes smaller. It is suggested that the border between the skin and core layers, where tensile property changes, shifts to the surface of PBT injection moldings as mold temperature increases.DOI : 10.3139/217.1827 En ligne : https://drive.google.com/file/d/1di8BScQmMNzTkzGOsghl3ACE8jTy8FDE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3114
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Code-barres Cote Support Localisation Section Disponibilité 001029 - Périodique Bibliothèque principale Documentaires Disponible Establishment of gas counter pressure technology and its application to improve the surface quality of microcellular injection molded parts / S. C. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 3 (07/2011)
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Titre : Establishment of gas counter pressure technology and its application to improve the surface quality of microcellular injection molded parts Type de document : texte imprimé Auteurs : S. C. Chen, Auteur ; P. S. Hsu, Auteur ; Y. W. Lin, Auteur Année de publication : 2011 Article en page(s) : p. 275-282 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection microcellulaire
Mousses plastiques
PolystyrèneTags : 'Contre-pression gaz' GCP 'Moulage injection microcellulaire' 'Mousse polystyrène' Index. décimale : 668.4 Plastiques, vinyles Résumé : The purpose of this study is to establish the Gas Counter Pressure (GCP) technology in combined with microcellular injection molding process. The application of gas into the mold cavity during the melt injection period provides a counter force against the melt front advancement, restricting the foaming process during the melt filling stage. Various gas counter pressures from 0 bar up to 300 bar and gas holding times of 0 to 10 s after filling completion were employed for investigating their relevant effect. It was found that when gas counter pressure is greater than 100 bar, foaming does not appear in the skin layer if no holding time is applied after melt-filling. As gas counter pressure increases, thickness of the solid skin layer without foaming also increases. Employment of holding time after melt-filling also assists foaming restriction in the melt core area. If a holding time of 10 s is applied combined with a counter pressure greater than 100 bar, foaming is completely restricted resulting in a transparent PS sample part. The part surface of those subjected to foaming-restriction in the skin layer also appears to be smooth and glossy. For the black PS parts molded via microcellular injection combined with gas counter pressure, it appears the same gloss quality as that achieved by conventional injection molding. DOI : 10.3139/217.2437 En ligne : https://drive.google.com/file/d/1n3HgCjklMlvMNw-m-OWePLgATkWTSzfG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12406
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Code-barres Cote Support Localisation Section Disponibilité 013159 - Périodique Bibliothèque principale Documentaires Disponible ESTRIM - a fast-demoulding injection technology for epoxy composites / Antonio Cossolo in JEC COMPOSITES MAGAZINE, N° 59 (08-09/2010)
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Titre : ESTRIM - a fast-demoulding injection technology for epoxy composites Type de document : texte imprimé Auteurs : Antonio Cossolo, Auteur Année de publication : 2010 Article en page(s) : p. 63-66 Langues : Anglais (eng) Tags : 'Condition mise en oeuvre' 'Equipement mis Démoulage 'Moulage injection réactif' Stratifié 'Fibre continue' 'Matériau renforcé fibre' 'Paroi mince' composite' Epoxy Index. décimale : 668.4 Plastiques, vinyles Résumé : The Cannon Group recently announced the development of ESTRIM - a fast-demoulding injection technology for epoxy resin-based composites for automotive and other mass-production markets. Lightweight thin-walled composite mouldings of complex shape and medium-to-large dimension made with epoxy resins and carbon or other continuous fibres can be produced a significantly reduced cycle times. A part-to-part cycle of 3 to 5 minutes - a demand from the automotive industry - can now be achieved. Note de contenu : - THE PROBLEM
- THE SOLUTION
- THE INNOVATIVE APPROACH : High pressure : how does it work ? - Dedicated preformers - Smart chemistry - Successful trialsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13789
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Code-barres Cote Support Localisation Section Disponibilité 012405 - Périodique Bibliothèque principale Documentaires Disponible Micro injection molding of hybrid parts in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 7 (07/2011)
PermalinkThe effect of polymer additives on surface quality of microcellular injection molded parts in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)
PermalinkThe effects of various variotherm processes and their mechanisms on injection molding / C.-T. Huang in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 3 (07/2011)
PermalinkThe right changeover point for each shot / Reinhard Schiffers in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 11 (11/2014)
PermalinkWater penetration behavior in water-assisted injection molding (WAIM) : A study of product quality for different process and material parameters / Sofie Sannen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)
PermalinkMoules à canaux chauds et à commande en cascade / Horst. Lobers in PLASTIQUES & ELASTOMERES MAGAZINE, N° 53-5 (06-07/2001)
PermalinkChurning out hybrid parts / Susanne Palm in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 7 (07/2011)
PermalinkParamètres procédé et qualité du remplissage / Maël Moguedet in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 869 (09/2009)
PermalinkArbutin determination in medicinal plants and creams / W. Thongchai in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 31, N° 2 (04/2009)
PermalinkFlow modification process for vacuum infusion using port-based resin flow control / J. B. Alms in SAMPE JOURNAL, Vol. 45, N° 2 (03-04/2009)
PermalinkLes possibilités du moulage de multi-composants in PLASTIQUES & ELASTOMERES MAGAZINE, N° 55-3 (04/2003)
PermalinkAn innovative aircraft structure produced by RTM using advanced stitched preforms in JEC COMPOSITES MAGAZINE, N° 65 (05-06/2011)
PermalinkMaking modular bus body shells from composite materials / J. M. Meza in JEC COMPOSITES MAGAZINE, N° 59 (08-09/2010)
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