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1
Karsono, Dudhi. "Two-component injection molding : study on thermoplastic and rubber (T/R) combination /". Connect to resource, 1998. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1188322477.
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Karsono, Dudhi. "Two-component injection molding: study on thermoplastic and rubber (T/R) combination". The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1188322477.
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Wolf, Anthony. "Multi-station injection molding, design and analysis using evolutionary algorithms". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ63127.pdf.
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Fowler, Gregory Thomas. "Cost and performance evaluation models for comparing multi-shot and traditional injection molding". College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1759.
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Thesis (M.S.) -- University of Maryland, College Park, 2004.Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
5
Shi, Jianjun. "Experiment and simulation of micro injection molding and microwave sintering". Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2064/document.
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Procédé de moulage par injection de poudres est constitué de quatre étapes principales: la préparation des matières premières, moulage par injection, le déliantage et le frittage. Cette thèse présente les recherches sur deux aspects principaux: la micro-injection et frittage par micro -ondes. Les contributions principaux peuvent être conclues dans les quatre aspects suivants: Modification et complément de l'algorithme précédent pour la simulation du procédé de moulage par injection; L'évaluation et la mise en œuvre de l'effet de tension de surface en simulation pour micro-injection; Micro-ondes expériences de frittage de compacts basés sur l'acier inoxydable 17-4PH; Réalisation de la simulation de frittage à micro-ondes avec couplage de la multi-physique, y compris le chauffage à micro-ondes classique, le transfert de chaleur, et le supplément de modèle pour la densification de frittage de la poudre compactéPowder Injection molding process consists off our main stages: feedstock preparation, injection molding, debinding and sintering. The thesis presents the research on two main aspects: micro injectionmolding and microwave sintering. The main contributions can be concluded in thefollowing four aspects: Modification and supplement of previous algorithm for the simulation ofinjection molding process; Evaluation and implementation of surface tension effect in simulation for micro injection; Microwave sintering experiments of compacts based on 17-4PH stainles ssteel; Realization of the microwave sintering simulation with the coupling of multi-physics,including the classic microwave heating, heat transfer, and the supplement of model for sintering densification of powder impacts
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Beckmann, Annika. "Direct oxygen injection experiments and investigation of multi-component mass transfer processes". Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-223858.
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The aim of this thesis was to investigate the impact of a direct oxygen injection as a potential remediation strategy for contaminated aquifers on a bench scale. The mass transfer between a multi-component trapped gas phase and a mobile water phase was studied. Column experiments with dynamically compressed sediments and a direct gas injection of pure oxygen gas were performed. In addition, a new developed kinetic multi-component model was used to describe the experiments. The amount of gas that could be captured in the pore space during direct oxygen injection and the time needed for a complete dissolution of the trapped gas phase were determined. Varying influences of different gases already dissolved in the mobile water phase on the dissolution process of a trapped oxygen gas phase were described for different flow regimes and confirmed by the model results. Finally, on the basis of the experimental and model results obtained in this thesis, predictions for an application of a direct oxygen injection in the field were discussed.
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Beckmann, Annika. "Direct oxygen injection experiments and investigation of multi-component mass transfer processes". Doctoral thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=980851246.
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Beckmann, Annika. "Direct oxygen injection experiments and investigation of multi component mass transfer processes". Leipzig UFZ, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=980851246.
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Härtig, Thomas. "Stoffübertragung beim Spritzgießen". Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-108290.
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Das Fügen mehrerer Komponenten während des Spritzgießprozesses wird bei vielen Spritzgießsonderverfahren angewandt. Diese Arbeit beschäftigt sich mit der Verbundbildung zwischen einem kalten Einlegeteil und der einströmenden Kunststoffschmelze beim Spritzgießen, im Folgenden Stoffübertragung genannt. Ein Großteil der Untersuchungen findet an Zweikomponenten-Zugstäben statt, wobei erste und zweite Komponente aus dem gleichen Thermoplast gefertigt werden. Mögliche Einflussfaktoren auf die Verbundfestigkeit werden zunächst im Theorieteil vorgestellt und diskutiert. Eine Auswahl relevanter Prozess- und Materialparameter wird dann in praktischen Versuchen detailliert analysiert. Es wird nach korrelierenden Tendenzen sowohl zwischen unterschiedlichen Verfahren als auch zwischen verschiedenen Kunststoffen gesucht. Mittels statistischer Versuchsplanung werden die Spritzgießparameterkombinationen nach Größe des Einflusses auf die Verbundfestigkeit sortiert. Dies trägt zum Verständnis der bei der Stoffübertragung ablaufenden Grundmechanismen bei. Weiterhin werden die Einflüsse der Prozessparameter auf das neue Verfahren der In-Mold Oberflächenmodifizierung, bei dem ein funktionaler Modifikator während des Spritzgießprozesses übertragen wird, mit den Ergebnissen der Zweikomponenten-Verbundfestigkeit verglichen. Abschließend wird auf die Besonderheiten bei der selektiven Stoffübertragung eingegangen und das neue Verfahren des In-Mold Printing vorgestelltThe joining of two components by the process of injection molding is state of the art, although adhesion phenomena are not fully understood yet. The formation of bonds between a cold material, which was inserted or applied onto the surface of the cavity before injection molding, and an injected polymer melt is studied in this work. Providing sufficient bond strength, the material is transferred from the surface of the mold to the injection molded part. Possibly influencing factors on the bond strength are first identified, theoretically discussed, later in experiments varied and finally analyzed. Thereby correlating tendencies between different polymers and different in-mold technologies are observed. The relevant material and processing parameters are put in order by their influence on the bond strength using design of experiments. This helps to understand the mechanisms of the formation of bonds. The majority of the experiments is concerned with two component injection molding by measuring the bond strength of two component tensile bars, produced under varying processing conditions. In each case, first and second components are made of the same thermoplastic polymer. The thermal energy of the melt can be used also to initiate chemical reactions. This permits bonding of a thin layer of a functional polymer, which is applied onto the surface of the mold before injecting the melt, to the surface of the molded part. In this way, process-integrated surface modification during injection molding becomes possible. In a further attempt, patterns of paint are printed onto the surface of the mold by pad printing. During injection molding the paint is transferred completely to the surface of the polymeric part. Using this new technology of In-Mold Printing, fully finished surface decorated parts can be produced by injection molding
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Kong, Xiangji. "Development and characterization of polymer- metallic powder feedstocks for micro-injection molding". Phd thesis, Université de Franche-Comté, 2011. http://tel.archives-ouvertes.fr/tel-00844736.
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Micro-Powder Injection Moulding (Micro-PIM) technology is one of the key technologies that permit to fit with the increasing demands for smaller parts associated to miniaturization and functionalization in different application fields. The thesis focuses first on the elaboration and characterization of polymer-powder mixtures based on 316L stainless steel powders, and then on the identification of physical and material parameters related to the sintering stage and to the numerical simulations of the sintering process. Mixtures formulation with new binder systems based on different polymeric components have been developed for 316L stainless steel powders (5 µm and 16 µm). The characterization of the resulting mixtures for each group is carried out using mixing torque tests and viscosity tests. The mixture associated to the formulation comprising polypropylene + paraffin wax + stearic acid is well adapted for both powders and has been retained in the subsequent tests, due to the low value of the mixing torque and shear viscosity. The critical powder volume loading with 316L stainless steel powder (5 µm) according to the retained formulation has been established to 68% using four different methods. Micro mono-material injection (with 316L stainless steel mélange) and bi-material injection (with 316L stainless steel mélange and Cu mélange) are properly investigated. Homogeneity tests are observed for mixtures before and after injection. A physical model well suited for sintering stage is proposed for the simulation of sintering stage. The identification of physical parameters associated to proposed model are defined from the sintering stages in considering 316L stainless steel (5 µm)mixtures with various powder volume loadings (62%, 64% and 66%). Beam-bending tests and free sintering tests and thermo-Mechanical-Analyses (TMA) have also investigated. Three sintering stages corresponding to heating rates at 5 °C/min, 10 °C/min and 15 °C/min are used during both beam-bending tests and free sintering tests. On basis of the results obtained from dilatometry measurements, the shear viscosity module G, the bulk viscosity module K and the sintering stress σs are identified using Matlab® software. Afterwards, the sintering model is implemented in the Abaqus® finite element code, and appropriate finite elements have been used for the support and micro-specimens, respectively. The physical material parameters resulting from the identification experiments are used to establish the proper 316L stainless steel mixture, in combination with G, K and σs parameters. Finally, the sintering stages up to 1200 °C with three heating rates (5 °C/min, 10 °C/min and 15 °C/min) are also simulated corresponding to the four micro-specimen types (powder volume loading of 62%, 64% and 66%). The simulated shrinkages and relative densities of the sintered micro-specimens are compared to the experimental results indicating a proper agreement
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Fiedlerová, Eva. "Porovnání efektivnosti technologie svařování plastů a vícekomponentního vstřikování". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229925.
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Diploma thesis is focused on injection molding and welding technology of plastic materials. First, in theoretical part, are commonly described polymer materials, following by description of welding, and multi-injection molding. There are closely described different methods for chosen part. Practical part is about comparison of method according differ criteria and application suitability. At the end of the thesis there is economic estimation of methods.
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Ou, Huibin. "Modélisation multi-physiques et simulations numériques du moulage par injection mono et bi matières thermoplastique / silicone liquide". Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2001/document.
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La famille des élastomères silicones LSR (Liquid Silicone Rubber) de haute technicité est identifiée comme celle possédant les plus forts arguments de développement au cours des prochaines décennies en raison de leurs propriétés spécifiques et de leurs facilités de mise en forme en grande série. Notamment, le moulage par injection du LSR sur d’autres matières telles que les thermoplastiques ou les métaux est aujourd’hui possible, ce qui ouvre la possibilité d’obtenir des composants multi-matières, multi-couleurs et de nouvelles fonctionnalités. Cette thèse se concentre sur la transformation des élastomères silicones LSR dans le but de mieux appréhender les phénomènes impliqués, afin d’améliorer les procédés d’élaboration et d’optimiser les conditions de transformation des composants élastométriques mono ou bi-matières à géométrie et propriété fonctionnelle bien définie. Les comportements rhéologique, cinétique et thermique des élastomères silicones ont été étudiés et caractérisés sous des conditions réelles de mise en œuvre par différentes méthodes associées. Un modèle thermo-rhéo-cinétique a été développé et ensuite implémenté dans un code de calcul de remplissage Cadmould® pour simuler le moulage par injection des élastomères silicones LSR ou encore le surmoulage de thermoplastiques. Pour la validation des modèles choisis et des paramètres identifiés, les essais d’injection sur l’outillage industrielle instrumenté ont été réalisés et confrontés à des résultats numériques obtenus. Enfin, la caractérisation de l’adhésion et l’adhérence interfaciale entre les thermoplastiques et les élastomères silicones a été réalisé sous différentes sollicitations complexes. De plus, l’évolution d’adhérence interfaciale des assemblages collés au cours de la vulcanisation des élastomères silicones a été caractérisée par l’essai de traction en utilisant un rhéomètre rotatif sous différentes modes de chauffageThe family of high technology silicone elastomers LSR (Liquid Silicone Rubber) is identified as having the strongest arguments for development in the coming decades due to their unique properties and easy forming in large series. In particular, the injection molding of LSR on other materials such as thermoplastics or metals is possible today, which opens the possibility of obtaining multi-material, multi-color and new features components. The work presented in this thesis focuses on the transformation of silicone elastomers in order to better understand the phenomena involved, as to improve production processes and optimize processing conditions for mono or bi-material components in geometry and property functional well defined. The rheological, curing kinetic and thermal behaviors of silicone elastomers have been studied and characterized under real conditions of production by different methods combined. A thermo-rheo-kinetic model was then developed and implemented in commercial computer software Cadmould® to simulate the injection molding process of LSR or the overmolding process of LSR on to thermoplastics. For the validation of the models chosen and the parameters identified, the injection molding tests on industrial instrumented tools were performed and compared to numerical results. Finally, the characterization of interfacial adhesion between the thermoplastic and silicone elastomers was carried out under various adhesion tests. Moreover, the evolution of interfacial adhesion in thermoplastic/silicone components during the vulcanization of silicone elastomers has been characterized by the tensile test using a rotating rheometer in different heating cycles
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Betáš, Martin. "Řešení výroby součásti "Klapka APZ13"". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402501.
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This master‘s thesis deals with the solution of the production of the given part "APZ13". The structural analysis of the component is followed by the choice of the available manufacturing technology. The following is a theoretical description of the chosen technology and injection mold. Its solution is practically described in the following chapter and then the creation of TPV documentation of the whole project. The conclusion of this master’s thesis is a technical-economic evaluation of the chosen technology and discussion.
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Bouček, Filip. "Návrh a posouzení uspořádání nové lakovací linky ve společnosti Automotive Lighting". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231013.
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The thesis deals with the design and arrangement of a new paint line at company Automotive Ligting s.r.o in Jihlava. It deals with design of several possible options of arrangement of machines that are required for the processing of polycarbonate granules and their conversion into acrylic glass using two-component injection molding. The glass is then coated with the coating line which is part of the arrangement included in this project. Design of the individual sites and their organization is based on both the company's requirements and the principles of technological design. The best of the three options is analyzed in detail and evaluated from the economic point of view.
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WEGRZYN, MARCIN. "Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization". Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/36869.
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This thesis presents the study of nanocomposites based on immiscible
polymer blend of polycarbonate and acrylonitrile-butadiene-styrene
(PC/ABS) filled with multi-walled carbon nanotubes (MWCNT). The aim is to
achieve an improvement of mechanical properties and electrical conductivity
of the nanocomposites.
In an initial stage, a twin-screw extruder was used to obtain nanocomposites
by melt compounding. Three methods of carbon nanotubes addition were
studied: direct addition, dilution from a masterbatch and feeding of MWCNT
suspension in ethanol. For each method, the influence of nanofiller content
and processing parameters on morphology and final properties of the
nanocomposite was analyzed. Furthermore, the influence of two types of
carbon nanotubes modifications was studied: covalent modification by
surface-oxidation (MWCNT-COOH) and non-covalent modification by an
addition of surfactant promoting the nanofiller-matrix interactions.
A good dispersion of the MWCNT was obtained for masterbatch dilution and
suspension feeding. Both methods showed preferential localization of
carbon nanotubes in polycarbonate phase (PC).
Samples processed by masterbatch dilution showed the 30 % increase of
rigidity and a decrease of ductility of PC/ABS for 0.5 wt. % MWCNT.
Electrical conductivity was influenced by processing temperature and carbon
nanotubes type. The percolation threshold value was 2.0 wt. % for pristine
MWCNT and 1.5 wt. % for modified MWCNT-COOH.
Better balance of mechanical properties and electrical conductivity was
achieved in the samples obtained by the masterbatch route. These
properties were studied in a subsequent phase, when the extruded
nanocomposite was injection molded in order to obtain a defined geometry.Wegrzyn, M. (2014). Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/36869
TESIS
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Imaddahen, Amine. "Étude expérimentale multi-échelle et modélisation hybride prédictive du comportement, de l'endommagement et de la durée de vie en fatigue d’un matériau composite polypropylène / fibres de verre". Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE063.
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L’objectif final de ce travail est de proposer un outil numérique capable de prédire l'endommagement et la durée de vie en fatigue des matériaux et structures en composite à matrice thermoplastique. Pour ce faire, une étude expérimentale multi-échelle du matériaux PPGF40 (polypropylène chargé en fibre de verre à 40% en masse) est réalisée. Une analyse qualitative, mais aussi quantitative des différents mécanismes d’endommagement se produisant lors d’une sollicitation mécanique a été réalisée à travers des essais de flexion trois points in situ MEB, des essais de fatigue interrompus et des observations des faciès de rupture en monotone et en fatigue. A la lumière de ces essais nous avons conclu que la décohésion de l’interface fibre-matrice et la propagation des fissures à travers les interfaces apparait être le phénomène prépondérant menant à la ruine du matériau et cela indépendamment de l’orientation des fibres et du mode de sollicitation monotone ou fatigue. La démarche hybride proposée est basée sur un modèle micromécanique / phénoménologique permettant de prendre en compte l’endommagement à l’interface fibre-matrice et la plasticité de la matrice. Pour ce faire, un critère local statistique d’endommagement à l’interface fibre-matrice est introduit dans un modèle de Mori et Tanaka et la linéarisation du comportement plastique de la matrice est réalisée pas à pas, en utilisant une approche en champs moyens avec une formulation sécante. Le modèle micromécanique utilisé permet alors de prédire le comportement du matériau sous chargement monotone et notamment la première perte de rigidité en fatigue. L’analyse des résultats montre que cette dernière est directement liée à la durée de vie en fatigue du matériau. Ainsi, une méthodologie prédictive de la durée de vie est proposée et validée pour différentes configurations microstructurales. Un critère de rupture en fatigue est proposé en fonction du nombre de cyclesThe main objective of this work, is to provide a numerical tool, capable of predicting the damage and fatigue life of thermoplastic matrix composites materials and structures. To do this, a multi-scale experimental study of the PPGF40 material (polypropylene loaded with 40% by mass of glass fiber) is carried out. A qualitative, but also a quantitative analysis of the various damage mechanisms occurring during mechanical loading was carried out through in-situ three-points SEM bending tests, interrupted fatigue tests and observations of fracture faces in monotonic and cyclic loading. In the light of these tests, we concluded that the decohesion of the fiber-matrix interface, and the propagation of cracks through the interfaces, appears to be, the predominant damage phenomenon leading to the fracture of the material and that, regardless of the orientation of the fibers and the loading mode. The proposed hybrid approach is based on a micromechanical / phenomenological model taking into account the damage at the fiber / matrix interface and the plasticity of the matrix. To do this, a local statistical criterion of damage at the fiber-matrix interface is introduced into a Mori and Tanaka model, and the linearization of the plastic behavior of the matrix is done step by step, using the mean field approach with a secant formulation. The micromechanical model used then, makes it possible to predict the behavior of the material under monotonic loading, and in particular the first stiffness loss during the fatigue. Analysis of the experimental results shows that the latter is directly related to the fatigue life of the material. Thus, a predictive methodology of the fatigue life is proposed and validated for various microstructural configurations. A fatigue failure criterion is proposed according to the number of cycles
17
Lamiel, Quentin. "Analysis of spray-wall impingement, fuel film spreading and vaporisation for reciprocating engine applications". Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0092/document.
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Le transport routier est responsable d’une partie des émissions de polluants sur la planète. Conscient de ce problème, des lois sur les émissions des véhicules sont régulièrement votées afin de réduire l’impact environnemental du transport automobile. Ces lois de plus en plus restrictives ont poussé les fabricants automobiles à réduire la taille des moteurs essence et à utiliser des procédés d’injection directe afin d’augmenter le ratio puissance/volume des moteurs et réduire la consommation. Cependant avec l’utilisation de l’injection directe, de nouveaux problèmes apparaissent, notamment la production de particules fines, elles-mêmes réglementées. Cette thèse s’inscrit dans ce cadre. En effet, les films liquides engendrés par l’injection de carburant sont identifiés comme principaux responsables de la production de particules. Dans ce contexte, les films liquides sont étudiés expérimentalement à l’aide d’un injecteur haute pression disposant de 3 trous. Les aspects dynamiques de création et d’étalement du film liquides sont étudiés et modélisés. S’en suit une étude thermique de l’interaction entre le spray et la paroi. Afin de caractériser les pertes de chaleur observées lors de l’impact, ces pertes thermiques étant responsables d’un délai dans la vaporisation du carburant et donc d’inhomogénéités du mélange au moment de la combustion, une modélisation de ces pertes et du transfert thermique associé est aussi proposée. Enfin une étude des taux d’évaporation de plusieurs alcanes purs puis de mélanges est proposée. Ces mesures ont servi à la calibration d’un modèle numérique d’évaporation de films fins de carburants sur des parois chaudes. Autour de ces différentes études, une campagne d’essais moteurs a été effectuée. L’objectif est de confirmer que les études expérimentales faites en laboratoires sont bien transposables (moyennant la prise de certaines précautions) aux moteurs automobiles. Les conclusions des différentes études sont finalementproposéesThe road transport is responsible of a considerable amount of pollutants emissions at the worldwide scale. To tackle this issue, many laws are trying to give a framework to reduce the emissions at the global scale. The law are always more restrictive, and they oriented the car manufacturers to the reduction of their gasoline engine size. This phenomenon, called downsizing, lead to the use of direct injection in order to improve the power/volume ratio of the engine. However, with direct injection the problem of particle emissions arose. Indeed, the liquid film generated during the injection process are responsible of inhomogeneities in the combustion chamber which lead to particles formation. In this context, the study of the fuel films in the combustion chamber is a major concern. To perform this study several experimental apparatus are designed in this thesis. A high-pressure 3-hole solenoid injector is used in order to generate liquid films. The generation and the spreading of the liquid films is observed and modelled. Then the thermal aspects of the spray impingement is studied, to characterise the local heat transfer. These thermal loss are delaying the evaporation of the liquid film, which will lead to inhomogeneities in the combustion chamber and particle generation. A modelling of the heat transfer is also proposed, finally the evaporation rate of alkanes films is proposed. Mono and multicomponents films are studied, these measures were used to calibrate a numerical model for the evaporation of thin liquid films on hot walls. Together with the previous experimental investigationsand models a test campaign on a real engine has been held. The objective is to confirm that, the results produced out of the engine are transposable to the engine (with careful attention). Conclusions on the different aspects are then presented
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Hsu, Kuo Fu y 徐國福. "The Numerical Simulation of Multi-Component Injection Molding". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/51917033469414639998.
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Hsieh, Tung-Sheng y 謝東昇. "Mold-Flow Analysis of Warpage for Multi-Component Injection Molding". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/88458839947257951176.
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碩士國立中興大學
機械工程學系所
98
Recent years, multi-color injection molding products are increasing quickly because of requirements from consumer market for product’s functionality and appearance. Consequently, the multi-component injection molding technology becomes an important research direction. One of the critical factors for deciding the quality of injection molding product is the dimensional precision requirement. Since the amount of warpage will affect the dimensional precision requirement. Therefore, this research is focus on the discussion of warpage of multi-component injection molding. The process studied in this research is to combine different plastic material by two-shot injection molding technology. One example is to combine crystallization plastic PP and elastomer TPE, and the other one is to combine amorphic substance plastic PS and the elastomer TPE. The analysis is done by using computer-aided engineering software Moldex. This study is divided into two directions. The first direction is using Taguchi method to analyze the control factors of mold designing parameters to find out the optimal parameters for the minimum amount of warpage. The result shows that the improvement can reach 91.8% for optimal combination of parameters of the first shot compared to the average amount of warpage. The optimal combination of parameters for the second shot also can improve the amount of warpage to 40% compared to the average amount of warpage. The second direction is again using Taguchi method to analyze the control factors of process parameters to find out the optimal parameters for the minimum amount of warpage. Result shows that increasing packing pressure, melt temperature, mold temperature and packing time are helpful for reducing amount of warpage.
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Liao, Wen-Pin y 廖文彬. "The Application and Research for Multi-component Injection Molding Parts". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/91234273869138617532.
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碩士龍華科技大學
機械工程系碩士班
103
With the continuous developing of modern plastic craft, many new macromolecule materials have been developed and, compare with the characteristics of wood and metal, new materials’ are regarded to have higher utilizability. Therefore, many new techniques of specific injection molding are created correspondingly. The most representative new technique is Multi-Component Injection Molding. The purpose of this research is to manufacture ABS+TPR and ABS+TPU, the sealing component of linear guide, by the technique of Multi-Component Injection Molding. In the manufacturing process of TPU and TPR, burr usually happened due to over-pressure and, if the pressure is insufficient or the time of pressure-keeping is too short, contraction is generated due to the flexibility. Furthermore, the connectivity of ABS+TPR and ABS+TPU could be influenced by different temperature of cement or that of die. The higher temperature, the better connectivity. Compare to TPR, TPU has better connectivity so that there is no need to add cement between TPU and ABS, the backing material. For TPR, pseudo-connect usually happened between TPR and ABS. Founded in the research of dustproof depended on mechanical characteristics, drag force would decrease to a specific range when the operation length gets a certain distance. It’s called natural wear period. The effect of dustproof gets worse when this period ends. In the next period called saturation period, the wood dust gets inside the carriage continuously until the operation stops. Based on the research data, the effect of dustproof component stays in optimum condition during the natural wear period and gets worse dramatically when the speed of wear decreases slowly.
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Chang, Kai-Jie y 張凱傑. "Multi-Component Molding (MCM)". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/65614904538782820143.
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碩士國立雲林科技大學
機械工程系碩士班
95
In the modern plastic molded product fabrication, multi-component molding (MCM) is one of the great methods to diversify the development. Due to its complicated nature and the unclear physical mechanism for the Multi-Component Molding (MCM) processes, more investigations on its thermomechanical behavior are needed. In this study, the product geometrical effects and material selections in MCM processes have been conducted. Due to the differences between two plastic materials and the mold metal, there are complex temperature and stress distributions during the molding process. Warpage caused by such uneven temperature distribution will be investigated. The effects of the processing conditions on the bonding strength and residual stresses are also studied. During the second shot, the polymer melt was filled between first shot and mold metal and this resulted in uneven temperature distribution of the second shot polymer. The asymmetric residual stresses were built up and caused warpage of the final parts. Both CAE simulation and real experimental data showed quite similar tendency of the final warpage. Due to this effect, the final part tends to warp inward while the thicknesses of 2nd shot are larger than 0.5 mm. The larger the 2nd shot thickness, the higher the warpage. Effects of different processing conditions on the bonding strengths were studied by the Taguchi’s design of experiments. Experiment results reveal that the higher the mold temperatures, the higher the bonding strengths. Mold temperature is the key factor to affect the diffusion behavior. The second significant factor is the melt temperature. Normal contact has higher bonding strength than the shear contact because normal contact has similar directions of the molecular orientation. The residual stresses were measured by the photo-elasticity equipment. After the 2nd shot, the contact regions between two shots experience an annealing-like process. This results in reduction of the residual stresses of the 1st shot. On the other hand, the uneven temperature results in higher residual stresses and warpage of the second shot. The present results are believed to help people better understand the mechanism and make the proper design to fabricate the modern MCM products.
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Jyun-yiChen y 陳駿逸. "Two-component injection molding of molded interconnect devices". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/43412954579878389594.
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Wang, Chun-Hsiang y 王俊翔. "Multi-Spot Temperature Control of Injection Molding Machine". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/75091785696438340274.
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碩士國立高雄第一科技大學
系統資訊與控制研究所
99
Plastic injection products have been widely used, and their applications are still constantly expanding no matter in basic toys, in high-precision opto-discs, mobile /phone part, or in various medical supplies. The demand on the quality of plastic injection products becomes much higher and the dimension accuracy has been demanded in micrometer in stead of millimeter grade. There are many important factors that effect the quality and accuracy of the plastic injection products, and the performance of temperature control is one of them. According to PIDC’s report, 1℃in temperature control error can make dimension difference for a plastic injection product with length of 1m, which is not acceptable. Most of the temperature control used in industry adopted PID control method, but the control result is not so good in overshoot and steady state error. For better temperature control performance, a new control was proposed in this research, VSS-PID, which integrates VSS and PID. Using VSS-PID control, the temperature control performance, overshoot 1℃,steady state error± 0.2℃,heating time shorten 50％ has been shown in simulation and in real machine experimentation.
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CHANG, YU-CHENG y 張育誠. "Mold Design and Injection Molding Analysis of a Parking Sensor Component". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4a55vz.
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碩士國立高雄應用科技大學
模具系碩士在職專班
106
Car industry has grown vigorously for the past decade, leading to the increasing of vehicle numbers and drivers. Therefore, people pay more and more attention on driving safety system than before. High-Tech techniques are combined into active or passive safety equipment. Among them, parking sonar system is an important driving assistant equipment, for offering more comprehensive safety and convenience to car-driving. In fact, parking sonar system with complex design has several components. One of the important components is “Parking sonar sensor head cover”. It’s for fixing the sonar sensor onto bumper steadily and prevention of sensor falling off. Because head cover is installed at the outside of bumper, even after being wind-blown, sunshine-exposure, rain-spread, dust-dirt-grit-attacked, or shocked by high-pressured water gun when washing car, it still has to stay well-structured. As a result, head cover needs to contain precise scale and weatherability. Hence, this thesis focuses on commercializing new designed sensor cover. Firstly, we design and manufacture the sensor cover mold through mold-flow analysis. Secondly, produce sensor cover prototypes by injection molding with composite material of PBT mixing glass fiber, and investigate the key parameters of injection molding, which determine the forming precision and quality of head cover. Finally, analyze the root causes of cover defects when forming, review the countermeasures, and find the optimistic parameters to mass-produce parking sonar sensor head cover. Keywords：Parking sonar, Parking sonar sensor head cover, Injection Molding, PBT, Glass fiber.
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Taljaard, Rosa Elizabeth. "Multi-component determinations using sequential injection analysis". Thesis, 1999. http://hdl.handle.net/2263/30092.
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Hsieh, Ching-Chung y 謝錦忠. "Study Stability Parameters for Injection-Molding Production Process on Medical Plastic Component". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9vea5e.
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碩士中原大學
機械工程研究所
106
This study utilizes Design of Experiments methods to find more stable and suitable injection molding parameters. These results are imported from exper-iments designed to have all parameters covered and calculated to obtain a more adequate parameter set. This method helps to reduce trial shots and provide a stable production process, where the trial shots in real field application, can be very costly. Advance injection molding machine, auxiliary Coordinate Measurement Ma-chine (3D CMM) and Minitab software package are used to analyze experiment results, they can solve abnormal production and reduce cost by setting the production parameters to an optimal. This method reduces the sensitivity of parameters which reduces quality variance due to parameter variation. The main idea of this thesis is to obtain an optimal processing condition. From results of the trial experiments defined by the DOE method and put into Process Performance Index (PPI) calculation to generate a better molding parameter set for production process. It can ensure stable production process and uniform quality for components. The experimental process is not only to search root cause of component defect but also to provide long-term stable production conditions by statistical data. Medical equipment requires stable part quality, hence this method can help to stabilize the part quality greatly by finding an optimal processing condition set. As like that, all plastic injection-molding can use DOE to find the best param-eter for production processing too.
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Cheng, Nien Tien y 鄭年添. "Study of the Post-Filling Stage in Two-Component Injection Molding Process". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/67074043625314464145.
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博士中原大學
機械工程研究所
84
The purpose of this research is to conduct a preliminary sutdy concerning the characteristics of the post-filling process of two-component injection molding process, namely co-injection molding process and gas-assisted injection molding, in order to investigated the effect of processing and the design parameters on their molding processes and part quality. This research firstly focuses on the investigation of the progression for both skin and core melt fronts during the post-filling process. Experimental studies of polymer melt flow in the post-filling stage of co-injection molding process have been performed using the sequential injection of transparent and colored polystyrene resin. During the post-filling process, polymer melt flows significantly and the amount of melt flow increases with increasing packing pressure. Also, the polymer melt flow is more concentrated around the cavity location near the gate area and is less distinguished far away from the gate. A layer control volume/FEM and tripl-filling-parameter algorithm employed within each grid layer in the gapwise direction are applied to trace the melt fronts advancement for both skin and core materials during the post-filling process. Numerical simulation shows good consistency with experimental results in both skin and core material distributions. If the edge effect is taken into account using a shape factor as a geometric correction and melt frozen effect is considered, the simulation accuracy is further improved. Secondly, numerical simulations and experimental studies of gas penetration and melt flow are carried out during gas-assisted injection molding. Distribution of the skin melt thickness along gas penetration path is described as a simple model of two phase flow. A simple formulation based on non-isothermal power-law fluid model is derived in order to evaluate the effect of various processing parameters as well as melt rheological behavior on the skin melt formation. Skin melt thickness ratio
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Chen, Yu-Ting y 陳昱廷. "Multi-Objective Optimization for Double-Sided Aspherical Lens Injection Molding". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/50899331727540318783.
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碩士義守大學
機械與自動化工程學系
104
This study focuses on obtaining the injection molding parameter settings for producing high precision double-sided aspherical lenses. A neural network approach is used to construct a quality predictor, and a genetic algorithm is followed to search for the optimal parameters settings of the predictor. Mold temperature, plastic temperature and holding pressure are selected as the major process parameters in experiments. At first, Taguchi method is carried out to find the optimal parameter combination for each side of the lens. However, the optimμm parameter combinations obtained for two feature surfaces are not the same. Therefore, multi-objective Taguchi method is used to identify a preferred parameter combination for the two surfaces. The obtained parameter combination is then used as the training set for a neural network quality predictor. Regression analysis is conducted by using predicted results and test results to realize the performance of the quality predictor. Finally, a genetic algorithm is applied to obtain a set of optimal combination of parameters which can improve the accuracy of double-sided aspherical lenses. Results of optimization parameters obtained by multi-objective Taguchi method are mold temperature 110 ℃, plastic temperature 250 ℃, and holding pressure 65MPa. The surface shape accuracy of double-sided aspherical lens for feature surface I is 1.874μm, and 2.181μm for feature surface II. The optimization parameters obtained by quality predictor and genetic algorithms are mold temperature 100.6 ℃, plastic temperature 251.3 ℃, and holding pressure 57.2MPa. The surface shape accuracy of double-sided aspherical lens for feature surface I is 1.221μm, and 0.968μm for feature surface II. Comparing the obtained results, parameter settings obtained by using the optimization method combining quality predictor with genetic algorithm can improve the surface accuracy of the double-sided aspherical lens.
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Lee, Feng-Chi y 李豐吉. "Research on Multi-Scale Hybrid Optical Elements by Injection Molding". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/60630087523422359384.
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碩士國立臺灣科技大學
機械工程系
97
This research is to develop and integrate the in-mold micro compression (IMMC) and varithermo mold temperature (VMT) method in injection molding process for investigating the multi-scale hybrid optical elements including the aspheric form error (Rt) and the replication or groove filling ratio (GFR) of Fresnel diffraction structure. The data acquisition system is used to integrate these two processes. In the IMMC method, piezoelectric actuator and pressure sensor are used to test with different percentages of peak filling pressure. The VMT method is to switch on the compression air to achieve quick mold cooling after sensing the packing phase signal from the injection molding machine. It is to investigate the effect of different cooling setting temperature (CST) on the quality of molded parts. The Rt can be achieved as 1.29 μm when the mold temperature is set as 100 ℃ in the traditional injection molding. Then experimental results show that the Rt can be achieved as 3.32 μm and the GFR as 96.95% when the mold temperature is set as 120 ℃, the CST of varithermo mold temperature as 80 ℃, and the IMMC method with trigger point as 50% of peak filling pressure. Further research focuses on the replication of hybrid lens array optical elements with micro structures to increase the optical performances.
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Chang, Shih-Yueh y 張仕岳. "Multi-objective Process Optimization of Thin-wall Plastic Injection Molding". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/63885445516756882164.
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碩士國立高雄第一科技大學
機械與自動化工程所
94
Abstract In traditional quality engineering , Taguchi’s Method has been applied in a various rang of industrial applications.However, the majority only to discussion of single performance characteristics optimization. It usually depends upon the experiences of the engineers when dealing with the multiple performance characteristics. It is easy to cause fuzziness and conflict due to the different assignable criterion of the engineers. The more the number of the performance characteristics, the stronger the correlation of them. It also brings the engineer the difficulties of resolving the performance characteristics conflict. The injection molding can be used in the manufacturing, and the necessary cost is relatively low, so benefit and can make abandonning products. Because products have light , thin , short , small and accurate, the development of thin-wall injection molding process is very important, but in the injection molding process, appropriate machining parameters are vital to expected productivity and quality. In general, only experienced and skilled operatots are capable of choosing the machining parameters.It is a complicated job to analyze the effects of process parameters on the various processing characteristic. Therefore, it might greatly promote the industry competitiveness if a set simple and accurate multiple analysis method. It is also suitable for improving various process. This article use the Thin-wall injection molding process ,first use the dynamic characteristic theory of Taguchi Method to discussion programmed dimension vs. product dimension than combination of Taguchi’s Method, principal component analysis, response surface methodology and fuzzy theory to content the optimization of multiple quality characteristic. In this study use the optimization of work pieces. The machining parameters under discussion are pressure, temperature, speed, holding time, cooling time, screw rpm, screw pitch and force while the machining performance concerned includes dimension precision, dimension accuracy, flash and warpage. Keyword:Taguchi’s method , Principle Component Analysis, Response Surface v Methodology, Fuzzy sets theory, Multiple Performance Characteristics Index.
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Pu, Mei Hua y 普美華. "Multi-Mediumization of Application Technology for Gas-Assisted Injection Molding". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/53055167955276362640.
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Chen, Chun-Hung y 陳駿鴻. "Study of Optimizing the Injection Insert Molding Process of the Control Valve Component". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/94967494605705199549.
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碩士逢甲大學
材料與製造工程所
100
In this study, the focus is placed on the mold flow analysis with the control valve component of the pneumatic hand-held tools. It is made by inject PTU plastic into embedded POM of insert molding. Taguchi method was implemented in the design experiments with Moldex3D mold flow analysis software, to reducing the number of experiments systematically, and investigating the influences from various conditions on the insert deformation parameter to the injection molding. Therefore, to obtain the minimum volume on the variants to optimize the best injection molding process parameters. The results reveal that adjusting the temperature of plastic and filling time can effectively reduce the amount of deformation, in which the temperature of plastic is as of the most influential factor. The parameter of deformation amount from the original CAE analysis was 0.5719 mm, whereas the optimized parameters from the CAE analysis of the deformation is 0.4663 mm. Optimizing the process parameter has improved 15.63% considerably of the amount of deformation comparing to the original process parameters, which further proves that Taguchi method does facilitate and improve design experiment planning and parameter optimization significantly.
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Wu, Chi-Hsin y 吳奇欣. "The Study of Two-Component Injection Molding Process by Applications of Computer-Aided Engineering". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/06365559746442702943.
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碩士中原大學
機械工程研究所
97
Abstract Product design becomes more personalized as the time advanced, it should be designed pretty appearance by using various colors such as cell phones, electric watches etc. For the sake of it, we provide several varieties tooling designs in injection process; two-component tooling is widely used in the production by many injection factories now. In order to have more competitive advantages, the academy and industry are indulged in the researches of exact injection process in recent years. There are many different parameters related about fluidity of plastic-melted parts in each kind of injection process, such as pressure, temperature, time etc. Engineers should research the real parameters about the injection process by CAE moldflow analysis software to develop the fine goods rapidly. If so, the cost and time-elapsed will be dramatically reduced. This study is a research of the design for audio two-component plastic panel. Firstly, referring the two-component plastic product of audio two-component panel, we build and construct 3D designs by using computer-aided design software Pro/Engineer, then we construct mold flow analysis based on different controlled parameters. Secondly, referring the actual two-component plastic products of audio two-component panel, we choose the resin of Polycarbonate and Polycarbonate/ABS whose characteristics are good shock endurance, good transparency, high dimension stability after shaping, nonpoisonous property as our study object, then the optima parameters will be found by Taguchi method coordination and software of Moldflow in this study. The temperature of the first product of mold is suggested 100℃, the temperature of polymer melt is set by 320℃, the time of filling is 1.1 second. The temperature of the second product of mold is suggested 80℃, the temperature of polymer melt is set by 270℃, and the time of filling is 0.9 second. It is confirmed by checking examples of stereo faceplate with two-color injection method with the simulations from software, so the old try-and-error method could be replaced for the sake of profits and efficiency.
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Chan, Chia-Ming y 詹家銘. "Research on Multi-Scale Aspheric Lens Array by Vibratile Injection Compression Molding". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/12714991759842963441.
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碩士國立臺灣科技大學
機械工程系
100
This research is to improve and integrate the vibratile injection compression molding (V-ICM) and varithermo mold temperature (VMT) method into injection molding process of multi-scale aspheric lens array (MSALA) with micro structures for higher replication of lens and improving optical quality. Parameters of injection velocity, cooling setting temperature and PZT vibration frequency have been investigated base on performance of lens sag, aspheric form error and sub-microstructure filling ratio (SFR) by experimental design. The transmittance, residual stress, modulation transfer function and color value have been measured and discussed. Experimental results show that the V-ICM can improve lens sag as 98.3%, reducing the aspheric form error and improve the SFR upto 90.5%, and to reduce the peak pressure of injection molding effectively. The residual stress is then reduced for the obtained MSALA. From optical inspection, light wavelength 700nm can enhance penetration of lens with 2.77%, wavelength 600nm can enhance the transmittance of lens as 1.16%. For image quality test, the best resolution for MTF30 and MTF50 can achieve 0.249 (C/P) and 0.3 (C/P). Finally, the brightness gradation of MSALA can improve upto 2.19% than that without sub-microstructure lens. Result of this research can effectively improve the imaging quality of MSALA with micro structures. Further study can apply on the ultra-thin camera lens and multi-lens array module.
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CHENG, MING-CHUNG y 鄭明忠. "The Effects of Mold Design Parameters on the Injection Molding of a Thin Plastic Handset Component". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/38260713338457474963.
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碩士國立臺灣科技大學
機械工程系
102
This study focuses on the mold design using Moldex3D (True 3D CAE Analysis), focusing on the variables of materials viscosity properties (SABIC EXL4419 with 10% GF and SABIC D351 with 30% GF), part thickness (0.65mm and 0.5mm) and number of gate(gate Q’ty=2,4,6 set). The results of weld line, injecting pressure, velocity of melt near gates, melt temperature near gates, deformation of component are correlated with the mold design, using different optimal molding parameters. Results show that the number of gate and the viscosity properties of material play the crucial role on the success of molding a thin part. For a thickness of 0.65 mm, a larger number of gate caused a higher degree of deformation. On the other hand, for a thickness of 0.50 mm, a larger number of gate caused a lower degree of deformation. Such a difference arises from difficulty in molding a thinner part that the molding parameters change dramatically.
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Huang, Ping-Ju y 黃品儒. "A study of Mold Filling and Warpage in Multi-Cavity Co-Injection molding". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/82582716490473126810.
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Kuo, Jhen-Wei y 郭朕瑋. "The Study on Multi-material Injection Molding of One Piece Zirconia Dental Implant". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/53088060492791757260.
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碩士國立高雄應用科技大學
機械與精密工程研究所
102
In this study, micro injection molding technology to produce porous surface one-piece zirconia dental implant, including two-shot injection molding then mold designed and fabricated to find a process in without the surface treatment to achieve porous surface zirconia dental. A one-piece dental implant was first designed in the study. Molding filling analysis was carried out using Molddx3D in the product and mold design step. The dental implant green parts was two-shot injection molding with Battenfeld microsystem 50 micromolding machine. Using processing window to determine Taguchi method molding parameter settings. In the Taguchi method molding experiments to achieve both having complete molding green parts and the smallest shrinkage to find the optimal molding parameter settings. The green parts were further gone through debinding and sintering processes to complete this rapid replication process. Results from molding experiments revealed that material temperature, mold temperature, and injection speed are the most important parameters that affect the green part quality. Results from the Taguchi experiments indicated that for the 1st injection molding, material temperature and injection speed influenced the green part shrinkage the most, mold temperature and injection speed influenced it the most in the 2nd injection molding. After debinding and sintering the dental implant measurement results shows the axial average shrinkage is 22.50%; the radial average shrinkage is 23.01%; the one-shot material average roughness is 1.226 μm; the two-shot material average roughness is 1.581 μm. However, larger the surface roughness can provide more contact area to promote osseointegration. Besides, it also conforms to the requirement of the roughness of osseointegration in oral clinical environment Ra 1 to 2 μm.
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Sun, Yu-han y 孫雨涵. "Effect of Process Conditions of Co-injection Molding on the Flow Balance of Multi-Cavities". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/25873872796237791930.
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碩士遠東科技大學
電腦應用工程研究所
100
The purpose of this study is to investigate process parameter for PP (hard material) and TPR (soft material) influence for co-injection molding. The process of co-injection molding is to inject two difference materials into single or multi-cavity molds. The product quality control by balancing melt flow in multi-cavity injection molds during injection molding process. The study used multi-cavity molds to research the balance and ratio influence of products for molding conditions including melt temperature, mold temperature and injection speed. The results show that: The higher melt temperature, mold temperature and injection speed gets better flow balance results. The deviation between the multi-cavity molds is the smallest. In core material TPR control, the higher mold temperature, injection speed and the lower mold temperature gets the highest core material contain. Meanwhile, the study also applies on a real product of Window Guider by co-injection molding process methodology. During the product design stage, a CAE mold flow analysis implement to calculate the best PP(hard material) and TPR(soft material) balance ratio design to get the product thickness and sharp design, and then an experience be used to prove the simulation and finial product design in dimension.
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Yang, Wei-Sheng y 楊偉聖. "Study on the Processing Analysis of the Multi-Cavity Injection Molding using Filling Balancing Device". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/43673712034669519777.
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碩士吳鳳科技大學
光機電暨材料研究所
101
In this thesis, the authors try to use the mold flow technique to analyze the filling balancing effects of multi-cavity injection molding by means of inserting a designed device. To explore the best processing parameters, the Taguchi method，including the orthogonal array, the signal-to-noise ratio S/N, and the analysis of mean is employed to analyze the affect factors of mold filling imbalances and to determine the optimal processing parameters. The 8-cavity mold (H-type) is used to process the injection molding simulation of the Taguchi method, and then to analyze the temperature distribution in the runners. The major object is to elevate the balanced performance by reducing the temperature difference of the runner cross-section.The inserted balancing devices are designed as two types, including the flanked well with different included angles and the MeltFlipper-like with different geometrical conformation. To obtain the best performances of the injected parts, the Taguchi method with Analysis of Mean (ANOM) is employed to explore optimal combinations of the assigned parameters. The mold flow analysis of the injection molding is used to carry out the Taguchi experiments. The results show that the flanked well with appropriate included angles and the MeltFlipper-like with suitable geometrical conformation will be able to achieve the optimal balancing effects of the runner system.
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Härtig, Thomas. "Stoffübertragung beim Spritzgießen". Doctoral thesis, 2012. https://monarch.qucosa.de/id/qucosa%3A18814.
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Das Fügen mehrerer Komponenten während des Spritzgießprozesses wird bei vielen Spritzgießsonderverfahren angewandt. Diese Arbeit beschäftigt sich mit der Verbundbildung zwischen einem kalten Einlegeteil und der einströmenden Kunststoffschmelze beim Spritzgießen, im Folgenden Stoffübertragung genannt. Ein Großteil der Untersuchungen findet an Zweikomponenten-Zugstäben statt, wobei erste und zweite Komponente aus dem gleichen Thermoplast gefertigt werden. Mögliche Einflussfaktoren auf die Verbundfestigkeit werden zunächst im Theorieteil vorgestellt und diskutiert. Eine Auswahl relevanter Prozess- und Materialparameter wird dann in praktischen Versuchen detailliert analysiert. Es wird nach korrelierenden Tendenzen sowohl zwischen unterschiedlichen Verfahren als auch zwischen verschiedenen Kunststoffen gesucht. Mittels statistischer Versuchsplanung werden die Spritzgießparameterkombinationen nach Größe des Einflusses auf die Verbundfestigkeit sortiert. Dies trägt zum Verständnis der bei der Stoffübertragung ablaufenden Grundmechanismen bei. Weiterhin werden die Einflüsse der Prozessparameter auf das neue Verfahren der In-Mold Oberflächenmodifizierung, bei dem ein funktionaler Modifikator während des Spritzgießprozesses übertragen wird, mit den Ergebnissen der Zweikomponenten-Verbundfestigkeit verglichen. Abschließend wird auf die Besonderheiten bei der selektiven Stoffübertragung eingegangen und das neue Verfahren des In-Mold Printing vorgestellt.The joining of two components by the process of injection molding is state of the art, although adhesion phenomena are not fully understood yet. The formation of bonds between a cold material, which was inserted or applied onto the surface of the cavity before injection molding, and an injected polymer melt is studied in this work. Providing sufficient bond strength, the material is transferred from the surface of the mold to the injection molded part. Possibly influencing factors on the bond strength are first identified, theoretically discussed, later in experiments varied and finally analyzed. Thereby correlating tendencies between different polymers and different in-mold technologies are observed. The relevant material and processing parameters are put in order by their influence on the bond strength using design of experiments. This helps to understand the mechanisms of the formation of bonds. The majority of the experiments is concerned with two component injection molding by measuring the bond strength of two component tensile bars, produced under varying processing conditions. In each case, first and second components are made of the same thermoplastic polymer. The thermal energy of the melt can be used also to initiate chemical reactions. This permits bonding of a thin layer of a functional polymer, which is applied onto the surface of the mold before injecting the melt, to the surface of the molded part. In this way, process-integrated surface modification during injection molding becomes possible. In a further attempt, patterns of paint are printed onto the surface of the mold by pad printing. During injection molding the paint is transferred completely to the surface of the polymeric part. Using this new technology of In-Mold Printing, fully finished surface decorated parts can be produced by injection molding.
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CHEN, HSIN-HUNG y 陳信宏. "Mold Flow Analysis for Process Parameters Optimization Design in the Bio-Detection Electrode Film Multi-Component Molding". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/n442pm.
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碩士南臺科技大學
電機工程系
105
Simulation of plastic injection molding by mold flow analysis, can reduce the number of test mode, shorten the mold design and development time and reduce production costs. With the progress of injection molding technology, bio-detection electrode chip base design widely used plastic injection process, not only increase the convenience of replacement, and significantly reduce the cost of manufacturing products. Therefore, the introduction of mold flow analysis technology in the bio-detection electrode chip multi-material injection molding (Multi-Component Molding) process analysis, multi-material injection molding is a diversified plastic model products, one of the advanced technology, a variety of materials or The colors are molded on the same product. In this study, the raw material electrode is used as the analysis element to explore how to make the maximum quantity of the product at the lowest cost and the shortest time, but still reach the best quality of the measurement level. The electrode piece is divided into the main body of the electrode The effect of molding parameters on the warpage of the modified model was studied by using the MCM process to analyze and import the Taguchi experiment. (Temperature, material temperature, flow rate, cooling time, packing pressure, holding time and runner design) were discussed. The trend of warpage of electrode plate under different molding conditions was discussed. Calculate the experimental prediction data, and find out the optimal conditions for each control change, determine the best combination of process parameters. Key words: Mold flow analysis, electrode piece, Taguchi method, warping, multi-material injection molding
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Beckmann, Annika [Verfasser]. "Direct oxygen injection experiments and investigation of multi-component mass transfer processes / vorgelegt von Annika Beckmann". 2005. http://d-nb.info/980851246/34.
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Zhou, Jian. "Single and multi-objective process optimization of injection molding using numerical simulation with surrogate modeling approaches and genetic algorithms /". 2007. http://www.library.wisc.edu/databases/connect/dissertations.html.
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You-ChenLin y 林宥辰. "iAgentX: Development of a Cloud Multi-agent Integrated Dynamic Management Technology and System for Cross-factory Injection Molding Machine". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/t877z9.
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碩士國立成功大學
製造資訊與系統研究所
103
Production information retrieval is an important issue for manufacturing process. Effective data transmission and retrieval mechanism with data protection is an urgent research topic. Therefore, a socket information retrieval mechanism and several services for information retrieval base on injection molding machines are proposed in this thesis called Production Information Retrieval Agent Architecture (PIRAA). The proposed agent adapted a customized packet format for client-server connection communication and sent process parameters back to a production process database. Using the experimental results, a cloud-based platform was implemented based on injection molding machines. The results show the PIRAA framework can be used for developing cloud-based platforms in a stabilized and remarkable way. In this thesis, a cloud multi-agent management architecture is proposed for an all-electric injection molding machine and its’ production information retrieval agent development via a signal retrieval technology called iAgentX. This architecture can be used for production information integration from a machine into a cloud data center for cross-factory management through cloud agent off-line and non-invasive technology. Windows Management Instrumentation (WMI) technology is used to serve as the multi-agent cloud dynamic management technology. The two algorithms proposed to construct iAgentX in this thesis are (1) a dynamic startup/sleep cloud agent mechanism and (2) a WMI remote process management mechanism. The two algorithms can be used in both of cross-factory and cross platform situations to manage multi production information retrieval agents. Statistical Process Control (SPC) parameters are retrieved by multi-agents can let manufacturing enterprises facilitate online monitoring and management. Finally, three data scales are simulated, including small (50 machines), medium (300 machines) and large (1000 machines) factories. A retrieval task is completed by one agent with a two-minute cycle time as a unit. The experimental results indicate that iAgentX can successfully manage multi-agents, and the production information produced by the multi-agent can be analyzed in an actual production environment.
45
Liu, Chung-Hui y 劉崇輝. "A Study of Multi-Recycling and Reusing on Mechanical Properties of Injection Molding : Case of Nano-Nylon 6 Composites". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/40706549873667322219.
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碩士國立屏東科技大學
工業管理系所
97
Comparing with general engineering plastics, Nylon 6 nanocomposites are superior in mechanical and thermal properties and are good for recycle. This study investigates the influence of the multi-recycling and reusing as well as various combination ratio of recycled material on mechanical properties of injection molding experimentally. Two-way ANOVA and regression analysis are used to interpret the experimental results and to construct the regression lines and relative equations. The results showed that the optimum combinations of recycling and reusing Nylon 6 nanocomposites depend on the aspect of tensile strength, flexural strength, impact strength, hardness, and heat deflection temperature respectively. The results of this study can be served as the reference of selecting the combinations of recycling and reusing Nylon 6 nanocomposites with the lowest material costs or new product design requirements. Keywords：Nano-Nylon 6, recycling and reusing, mechanical property, injection molding
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Tu, Wei-Chung y 杜維中. "Parameter Setting and Analysis of Plastic Injection Molding Process with Multi-Quality Characteristics Using Taguchi Method, Neural Networks and Genetic Algorithm". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/49430223157223410602.
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碩士立德大學
工業管理研究所
97
The components of plastic injection molding manufacture are diversified and changeable. Setting manufacturing parameters is required in producing each product, which is done and tested on the basis of engineer’s experiences as usual. However, due to the high turnover rate of employee, nowadays, it causes troubles in knowledge transfer. Moreover, the quality of product being changeable and its precision being raised has become other factors not relying on engineers’ experiences when setting parameters. Thus, in the study we propose an optimization system based on the neural networks, which allows inexperienced staff to lean manufacture parameters in a short time without any assistance of experienced engineers. It solves the problem of knowledge transfer. The experiment of the study is based on the orthogonal arrays of Taguchi method. By using signal-to-noise ratio, the staff would find out the initial composition of manufacture parameters. Then, constructing quality predictor is by means of the testing and training of neural networks. The manufacture parameters obtained from the quality predictor will integrate with the length and Warpage of product to find out an optimal set of parameters by genetic algorithm based on the established quality of goal. The findings of the experiment shows that the optimal set of manufacture parameters obtained from the optimization system in the study can achieve the required quality. Meanwhile, it also reduces the testing frequency of molding manufacture, which promotes the efficiency and convenience of manufacturing products.
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Pedroso, Mariana Moreira. "Análise dos parâmetros do processo de injeção para melhoria da qualidade de peças injetadas". Master's thesis, 2018. http://hdl.handle.net/1822/64987.
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Dissertação de mestrado integrado em Engenharia de PolímerosO mercado automóvel é um grande consumidor de peças plásticas, nomeadamente de peças injetadas, sendo por isso, um mercado que se encontra sob rigorosa regulamentação e requisitos bastante apertados que as peças necessitam de cumprir. É uma industria altamente competitiva e exigente, sendo necessária uma constante introdução de melhorias e inovação nos produtos bem como nos processos produtivos, possibilitando às empresas uma maior competitividade no mercado. O projeto a desenvolver centra-se na área de injeção de plásticos na empresa Aptiv, em Braga, no âmbito da dissertação do Mestrado Integrado em Engenharia de Polímeros. É essencial a produção de produtos de qualidade e sem qualquer tipo de defeitos, para isso é necessário existir um controlo de qualidade das peças injetadas muito rigoroso. O trabalho desenvolvido na dissertação baseia-se na identificação e respetiva resolução dos defeitos da injeção, tendo em conta os parâmetros da máquina e a influência que estes podem ter ou não durante o processo de produção do produto. Torna-se obrigatório fazer um estudo dos defeitos durante o processo de injeção e compreender onde estes podem ter origem. A primeira etapa do processo consiste em aprofundar os conhecimentos na área da moldação por injeção, perceber o modo como a peça em estudo é injetada. É necessário o estudo de todas as variáveis que poderão afetar o processo, matéria prima, periféricos usados e ambiente envolvente. Em seguida o objetivo é identificar os defeitos e verificar a frequência com que cada um aparece. Após esta analise as peças são submetidas a observação através de microscópio, análise da humidade do material e de microscopia Raman. Com estes testes, pode-se tirar conclusões dos defeitos a ser estudados Neste caso, verifica-se que os defeitos mais frequentes são os raiados, pontos pretos e pontos brilhantes. Com base no teste de microscopia Raman efetuado verifica-se que os pontos pretos é material policarbonato (PC) carbonizado, que os pontos brilhantes e os raiados é material policarbonato (PC). Posteriormente, faz-se o estudo dos parâmetros da máquina, através do método PCA, Análise de Componentes Principais . Este método permite verificar se existe alguma relação entre os defeitos encontrados e os parâmetros do processo de injeção. Após esta análise, conclui-se que os parâmetros do processo de injeção não são a causa do aparecimento dos defeitos.
The car market is a major consumer of plastic parts, namely injected parts, and therefore, a market that is under strict regulation and tight requirements that the parts need to comply. It is a highly competitive and demanding industry, requiring a constant introduction of improvements and innovation in products as well as in production processes, enabling companies to become more competitive in the market. The project to be developed focuses on the area of plastic injection in the company Aptiv, in Braga, within the scope of the dissertation of the Integrated Master in Polymer Engineering. It is essential to produce quality products without any kind of defects, for this it is necessary to have a very strict quality control of the injected parts. The work developed in the dissertation is based on the identification and respective resolution of the defects of the injection, taking into account the parameters of the machine and the influence they may or may not have during the production process of the product. It is mandatory to make a study of the defects during the injection process and to understand where they may originate. The first step in the process is to deepen the knowledge in the area of injection molding, to understand how the part under study is injected. It is necessary to study all the variables that may affect the process, raw material, used peripherals and surrounding environment. Then the goal is to identify the defects and check how often each one appears. After this analysis the pieces are submitted to observation through a microscope, analysis of the humidity of the material and Raman microscopy. With these tests, one can draw conclusions of the defects to be studied. In this case, it is verified that the most frequent defects are rays, black spots and bright spots. Based on the Raman microscopy test carried out it is verified that the black dots are carbonized polycarbonate (PC) material, which bright and light dots are polycarbonate (PC) material. Afterwards, the machine parameters are analyzed through the PCA method, Principal Components Analysis. This method allows to verify if there is any relation between the defects found and the parameters of the injection process. After this analysis, it is concluded that the parameters of the injection process are not the cause of the appearance of the defects.