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Relevant bibliographies by topics / Multi component injection molding

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Academic literature on the topic 'Multi component injection molding'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Multi component injection molding"

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Yang, Lung Jieh, Chung Yu Kao, and Chin Kwang Huang. "Development of Flapping Ornithopters by Precision Injection Molding." Applied Mechanics and Materials 163 (April 2012): 125–32. http://dx.doi.org/10.4028/www.scientific.net/amm.163.125.

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The authors investigate the component fabrication of a flapping ornithopter with 21.6 cm wing span by using precision injection molding. For making a bio-mimicking flapper like birds, two fold of plastic injection moldings have been done. Firstly the flapping mechanism of a 4-bar linkage gear transmission module has been studied, and the according plastic components for the gear transmission module were designed as light as possible. Thereafter the injection flow analysis in the multi-mold cavity and the fabrication parameters of the molding process has been implemented. The finished polyoxymethylene (POM) components for the transmission module of 1.2 gram in mass finally verify the design and process of the precision injection molding. After the ornithopterGolden Snitchwas assembled and tested with the fore-mentioned plastic 4-bar linkage, a maximum flight record of 480 sec was created in 2010. The second framework of injection molding is to design a bird-like expandable polystyrene (EPS) fuselage with 19.5 cm in length as the mechanical protection. After this ornithopterGolden Snitch-Prowas assembled, it has a successful flight of 230 sec and 100 times of landing capability. In summary, the fabrication of a polymeric bird-like flapper is proved, and the precision injection molding technique shows its feasibility in realization of ornithopters.

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Timmel, Tristan, Alexander Hackert, Tomasz Osiecki, Colin Gerstenberger, and Lothar Kroll. "Combined Injection Molding Technology for Dynamically Stressed Multi-Material Coupling Elements." Key Engineering Materials 744 (July 2017): 322–26. http://dx.doi.org/10.4028/www.scientific.net/kem.744.322.

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The manufacturing of high load components in automotive and mechanical engineering demands for an increased usage of combined plastics processing procedures. In practice, full plastic hybrid components are produced in a series of individual processes such as thermoforming or injection molding. The constructive implementation has often only material-substituting character wherein the high potential for lightweight anisotropic fiber composites is exploited only to a limited extent. Based on the application of a coupling brace in a vehicle, a new component design for function-integrated interface elements is enabled by an integrated injection molding technology. The targeted transfer of high local stresses by load-bearing insert elements regarding contoured metal sheets or Fiber Reinforced Thermoplastic Composites (TP-FRC) semi-finished products with endless fiber reinforcement enables efficient dimensioning of components. This fusion of technologies to a Multi Material Design (MMD) form the basis for novel weight-optimized, as well as cost-effective applications and lead to a high bending stiffness and high strength of structures. The composite strength of MMD components is increased by a variation and optimization of the thermoplastic/TP-FRC respectively thermoplastic/metal-interfaces. This objective will be achieved by highly efficient and integrated process flows and by the new entire construction of the component.

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Chen, Jin Nan, Qian Chao Mao, and Jian Wang. "Study on Injection Molding of Single Polymer Composites." Advanced Materials Research 1052 (October 2014): 482–88. http://dx.doi.org/10.4028/www.scientific.net/amr.1052.482.

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This article gives an overview of study on injection molding process of thermoplastic polymer SPCs. The thermoplastic polymer Polypropylene (PP) was selected as the experimental materials. Our study proves that advantages of the PP SPCs are friendly recyclability and excellent fire/matrix adhesion. PP SPCs samples had good interfacial compatibility and bonding properties. The one-component SPCs have better interfacial bonding than the multi-component SPCs. Injection molding is the most effective method with a large process window and short cycle time for processing a thermoplastic SPC. Injection molding could be developed to realize PP SPCs production.

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Löhner, Martin, and Dietmar Drummer. "Influence of Processing Parameters in Reaction Injection Foam Molding for Multi-Layer Parts on Foam Structure and Mechanical Properties." Applied Mechanics and Materials 805 (November 2015): 131–38. http://dx.doi.org/10.4028/www.scientific.net/amm.805.131.

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Reaction injection molding is a plastic processing method to produce net shape parts using reactive systems. By integrating semi-finished products as inserts, complex multi-layer parts can be generated in highly integrative and energy efficient processes. The material by far mostly used is polyurethane, a polymer which results from the reaction of isocyanate and polyol. By adding blowing agents, like for example water, to the polyol component, foamed parts can be realized. In contrast to thermoplastic injection molding a chemical reaction takes part during molding within the cavity. Therefore the processing parameters have a significant effect on this chemical reaction and on the properties of the finished part.In this work the influences of different processing parameters like for example mold temperature and injection volume on the resulting foam structure are investigated for reaction injection foam molding. Therefore multi-layer parts based on polyurethane materials (thermoplastic and reactive) were molded varying relevant processing parameters. The foaming took place within an open cavity. The resulting foam structures were characterized using scanning electron microscopy (SEM). Additional the multi-layer parts were characterized mechanically to reveal the resulting effects on the mechanical properties of parts containing a foamed reactive polyurethane component.

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Loaldi, Dario, Francesco Regi, Federico Baruffi, Matteo Calaon, Danilo Quagliotti, Yang Zhang, and Guido Tosello. "Experimental Validation of Injection Molding Simulations of 3D Microparts and Microstructured Components Using Virtual Design of Experiments and Multi-Scale Modeling." Micromachines 11, no. 6 (June 24, 2020): 614. http://dx.doi.org/10.3390/mi11060614.

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The increasing demand for micro-injection molding process technology and the corresponding micro-molded products have materialized in the need for models and simulation capabilities for the establishment of a digital twin of the manufacturing process. The opportunities enabled by the correct process simulation include the possibility of forecasting the part quality and finding optimal process conditions for a given product. The present work displays further use of micro-injection molding process simulation for the prediction of feature dimensions and its optimization and microfeature replication behavior due to geometrical boundary effects. The current work focused on the micro-injection molding of three-dimensional microparts and of single components featuring microstructures. First, two virtual a studies were performed to predict the outer diameter of a micro-ring within an accuracy of 10 µm and the flash formation on a micro-component with mass a 0.1 mg. In the second part of the study, the influence of microstructure orientation on the filling time of a microcavity design section was investigated for a component featuring micro grooves with a 15 µm nominal height. Multiscale meshing was employed to model the replication of microfeatures in a range of 17–346 µm in a Fresnel lens product, allowing the prediction of the replication behavior of a microfeature at 91% accuracy. The simulations were performed using 3D modeling and generalized Navier–Stokes equations using a single multi-scale simulation approach. The current work shows the current potential and limitations in the use of micro-injection molding process simulations for the optimization of micro 3D-part and microstructured components.

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Xie, Zhi Peng, Lin Lin Wang, Xian Feng Yang, and Zhen Ting Zhang. "Water Debinding for Zirconia Powder Injection Molding." Key Engineering Materials 368-372 (February 2008): 732–35. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.732.

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Water debinding is an important debinding technique for ceramic injection molding. However cracks or blisters usually generate during water extraction. In this paper, two types of multi-component binder systems were studied: (1) a major fraction of polyethylene glycol (PEG), and a minor fraction of polyvinyl butyra (PVB) and other additives. (2) a major fraction of PEG, and a minor fraction of polymethyl methacrylate (PMMA) and other additives. Mechanism of defects generation was investigated, and PEGs with various molecular weights were introduced to avoid cracks or blisters during the process. Further more, the compatibilities of PEG/PVB and PEG/PMMA were studied. The results showed that PEG and PMMA exhibited better compatibility, with the feedstock more homogeneous and sintered ceramic parts higher strength.

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Lei, Chen Jian, Jun He Yu, Hong Fei Zhan, Lei Chen, and Zhong Ren Jiang. "Multi-Objective Optimization Design for Double Toggle Clamping Unit of Injection Molding Machine." Applied Mechanics and Materials 201-202 (October 2012): 15–19. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.15.

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Clamping unit is an important component of injection molding machine. The clamping force and the clamping speed of clamping unit not only effect on the quality of molding products, but also determine the cyclic number. The large force amplification and large stroke ratio can reduce energy consumption and improve the productive efficiency. In this article, force amplification ratio and stroke ratio were used as the optimization goals. Non-dominated sorting genetic algorithm was used as the optimization method. The optimization result was better than the original design. So this article provides a reference for the same or similar product’s optimization.

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Kuang, Wei Hua, and Ju Liang Liu. "Forming Process and Technology Research of Mobile Telephone Frame." Applied Mechanics and Materials 20-23 (January 2010): 1401–4. http://dx.doi.org/10.4028/www.scientific.net/amm.20-23.1401.

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Injection molding is widely used to produce a variety of parts, from the smallest component to entire body panels of cars. It has some advantages, including high production rates, repeatable high tolerances, ability to use a wide range of materials, low labour cost and minimal scrap loss. As a case, the paper introduced the application of MoldFlow software in injection molding development of the mobile telephone frame. Best gate location was obtained. The numerical simulation provided scientific and valuable injection process information. At last, a multi-cavity injection mold for mobile telephone frame was designed, and the NC machining of the mold core was programmed by UG NX software.

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Piotter, Volker, Klaus Plewa, Tobias Mueller, Andreas Ruh, Elvira Vorster, Hans Joachim Ritzhaupt-Kleissl, and Juergen Hausselt. "Manufacturing of High-Grade Micro Components by Powder Injection Molding." Key Engineering Materials 447-448 (September 2010): 351–55. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.351.

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Powder injection molding (MicroPIM) has a considerable potential for the production of high-value metal and ceramic micro components. This does not only apply to technical aspects but, due to the deployability of mass production, also to economic ones. The current status can be summed up by the following key data: latest trials revealed smallest struc-tural details in the 10µm range or lower. Theoretical densities of up to 99% were achieved depend-ing on the particular powder applied. Typical materials processed are metals (Fe, Cu, 316L, 17-4PH, W and W-alloys etc.) or ceramics (aluminum/zirconium oxide etc.). Best surface qualities were obtained with ultrafine or even nano-doped ceramic powders. Another major line of development is multi-component or assembly injection molding. These proc-esses do not only reduce assembly expenditure, but also allow for the use of new functional material combinations. Interesting examples are ceramic micro heating elements or gear wheel/shaft samples which can be performed as fixed or movable combinations. Micro inmold-labelling using PIM feed-stocks offers further promising opportunities.

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Oliveira, D., A. Mateus, P. Carreira, F. Simões, and C. Malça. "Water Assisted Injection Molding for Single and Multi-branched Tubular Components." Procedia Manufacturing 12 (2017): 141–49. http://dx.doi.org/10.1016/j.promfg.2017.08.018.

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Dissertations / Theses on the topic "Multi component injection molding"

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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.

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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 compacté
Powder 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&quot, 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 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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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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Books on the topic "Multi component injection molding"

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Wolf, Anthony. Multi-station injection molding-design and analysis using evolutionary algorithms. Ottawa: National Library of Canada, 2001.

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Goodship, V., and J. C. Love. Multi-material Injection Moulding (Rapra Review Reports). Rapra Technology, 2002.

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Book chapters on the topic "Multi component injection molding"

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Shutov, Fjodor A., G. Henrici-Olivé, and S. Olivé. "Injection Molding: Two-Component Process." In Integral/Structural Polymer Foams, 81–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-02486-7_7.

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Alvarado-Iniesta, Alejandro, Jorge L. García-Alcaraz, Arturo Del Valle-Carrasco, and Luis A. Pérez-Domínguez. "Multi-objective Optimization of an Injection Molding Process." In Studies in Computational Intelligence, 391–407. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44003-3_16.

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Chi, Wenqing, Bin Xue, Xiaofei Li, Yuhang Zhang, and Shuangben Jiao. "Automatic Visual Inspection System for Injection Molding Parts of Automobile Center Console." In Application of Intelligent Systems in Multi-modal Information Analytics, 266–73. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51556-0_38.

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Fernandes, Célio, António J. Pontes, Júlio C. Viana, and A. Gaspar-Cunha. "Using Multi-objective Evolutionary Algorithms in the Optimization of Polymer Injection Molding." In Advances in Intelligent and Soft Computing, 357–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89619-7_35.

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Chen, Wen-Jong, and Jia-Ru Lin. "Application and Design of Artificial Neural Network for Multi-cavity Injection Molding Process Conditions." In Advances in Intelligent and Soft Computing, 33–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29390-0_7.

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Dählmann, Klaas, and Jürgen Sauer. "A Multi-Objective Approach for both Makespan- and Energy-Efficient Scheduling in Injection Molding." In KI 2016: Advances in Artificial Intelligence, 141–47. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46073-4_12.

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Khor, C. Y., M. A. M. Nawi, Muhammad Ikman Ishak, Salman Zainal, M. U. Rosli, and S. N. A. Ahmad Termizi. "Multi Response Optimization of Injection Molding Parameters for Artificial Phalanx Bone Using Response Surface Methodology." In Lecture Notes in Mechanical Engineering, 863–76. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0866-7_75.

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Fernandes, Célio, António J. Pontes, Júlio C. Viana, and António Gaspar-Cunha. "Multi-Objective Optimization of Gate Location and Processing Conditions in Injection Molding Using MOEAs: Experimental Assessment." In Lecture Notes in Computer Science, 373–87. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15892-1_25.

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Lourenço, Emanuel João, Nuno Moita, Sílvia Esteves, Paulo Peças, Inês Inês Ribeiro, João Paulo Pereira, and Luís Miguel Oliveira. "Multi-Perspective Eco-Efficiency Assessment to Foster Sustainability in Plastic Parts Production." In Handbook of Research on Green Engineering Techniques for Modern Manufacturing, 212–49. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5445-5.ch012.

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The eco-efficiency assessment is a powerful metric to introduce two components of sustainability assessment in the industrial companies' decisions making: the concurrent consideration of economic and environmental performance. The application of the eco-efficiency concept and of the normative documents is not an easy task, mainly because there are myriad environmental related indicator to consider and acquire. This barrier is higher in the realm of plastic injection molding, where each mold is unique, requiring a recurrent effort of data retrieving for such one-of-a-kind molds. To overcome this barrier, an integrated framework to support the eco-efficiency calculation on a life cycle perspective for a specific type of products, injection molds, is proposed in this chapter. It retrieves a small but representative selected set of eco-efficiency performance indicators. A tool was developed to apply the proposed framework and the results of its application to four real industrial case studies is discussed.

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Han, Chang Dae. "Reaction Injection Molding." In Rheology and Processing of Polymeric Materials: Volume 2: Polymer Processing. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195187830.003.0017.

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Reaction injection molding (RIM) is a thermoset processing operation during which the incoming feedstream(s) undergo cure reactions that give rise to a three-dimensional network structure (Becker 1979; Macosko 1989). Different from the operation of injection molding thermoplastic polymers presented in Chapter 8, in RIM operation the component(s) must cure rapidly (say, within 90 seconds) and a finished product is removed in 1−10 minutes, depending on the chemical systems, the part thickness, and the capabilities of the processing machine. The chief advantages of RIM over the injection molding of thermoplastic polymers are: (1) large parts can be produced at low energy consumption, (2) large parts with varying cross sections with or without inserts can be produced without the problem of sink marks, and (3) lightweight parts, owing to the microcellular structure, can be produced. However, the predominant industrial applications are in the automotive industry; for instance, in the production of automobile fascia. In the 1970s and 1980s, very intensive research activities were reported on a better understanding of the RIM operation. Thermosets must meet with some stringent requirements for RIM operation. These are: (1) viscosities must be fairly low at processing temperature, so that a rapid injection of the feedstreams can be realized; (2) the feedstreams must have sufficient compatibility for efficient mixing by the static impingement mixing technique; (3) cure reaction must be sufficiently fast, such that a finished product can be removed in a very short time after injection is completed; (4) a finished product must have sufficient stiffness and resiliency at elevated temperatures; and (5) a finished product must be released easily from the mold surface, etc. It is then clear that not many thermosets meet these requirements. It has been found that urethanes, with proper chemistry of the components, meet with the requirements. For this reason, urethanes have been the most widely used resin for RIM, although other thermosets (e.g., epoxy) have also been used to some extent.

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Conference papers on the topic "Multi component injection molding"

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Johnson, John L., Lye King Tan, Pavan Suri, and Randall M. German. "Metal Injection Molding of Multi-Functional Materials." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41151.

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Metal injection molding (MIM) enables processing of multi-functional components with combinations of properties including, magnetic and non-magnetic; magnetic response and corrosion resistance; controlled porosity and high thermal conductivity; high inertial weight and high strength; high thermal conductivity and low thermal expansion coefficient; wear resistance and high toughness; high thermal conductivity and good glass-to-metal sealing; high elastic modulus and high damping capacity; and magnetic response and electrical resistance. Such materials can be processed by MIM by co-injection molding and co-sintering, but compositions and sintering cycles must be optimized to minimize stresses arising from shrinkage mismatch while providing the desired properties To determine compatible combinations, individual materials, including various stainless steels and tool steels are mixed with a thermoplastic binder and injection molded. Debound components are subjected to dilatometry to determine dimensional change during sintering. The compatibility of these materials is predicted based on calculations of the thermal stress during co-sintering of concentric rings. For this geometry, shrinkage mismatches result in both radial stresses, which are the highest at the interface and lead to interfacial separation, as well as hoop stresses, which lead to radial cracking. These stresses are dependent on the thicknesses of the inner and outer rings. Defect-free components can be produced when the tensile hoop stresses do not exceed the intrinsic strengths of the component materials. Based on the dilatometry results, low stresses are predicted between a combination of magnetic and non-magnetic stainless steel and between a combination of austenitic stainless steel and tool steel. Example MIM bi-material components are processed from these combinations. The magnetic properties of the tough/wear-resistant bi-material are measured. General predictions and processing guidelines for other multi-functional materials are given.

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Schneider, Dorothea, Christof Hübner, and Serge Bourbigot. "New approach for the efficient attainment of flame retardancy using multi component injection molding." In PROCEEDINGS OF THE EUROPE/AFRICA CONFERENCE DRESDEN 2017 – POLYMER PROCESSING SOCIETY PPS. Author(s), 2019. http://dx.doi.org/10.1063/1.5084851.

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Gupta, S. K., X. Li, and A. Priyadarshi. "An Algorithm for Design of Multi-Stage Molds for Multi-Material Objects With Complex Interfaces." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39426.

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This paper describes an algorithm for automated design of multi-stage molds for manufacturing multi-material objects using multi-shot injection molding process. The algorithm described in this paper is a significant improvement over our previous algorithm [15] that worked on multi-material objects with simple planar interfaces. In the multi-stage molding process, the desired multi-material object is produced by carrying out multiple molding operations in a sequence, adding one material in the target object in each mold-stage. Each mold-stage can add only one type of material. Therefore, we need a sequence of mold-stages such that (1) each mold-stage adds a single-material component either fully or partially, and (2) the molding sequence completely produces the desired object. We expect that our algorithm will provide the necessary foundations for automating the design of multi-stage molds and therefore will help in significantly reducing the mold manufacturing lead-time.

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Wolf, A. R., L. H. Shu, and R. D. Venter. "Design of an Evaluative Tool for a Multi-Station Injection Molding System Using an Evolutionary Algorithm." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dfm-21187.

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Abstract A tool to facilitate the feasibility study of a newly proposed multi-station injection molding system is developed. The conceptual design and proposed embodiment of the new system are geared toward the development of a system flexible enough to handle multiple part types and production volumes. A comprehensive design model is used to structure the problem by identifying the desired design objectives and the effect the system variables have on the final design. An Evolutionary Algorithm optimization is used to find the combination of system variables that yields optimal system outputs. The algorithm uses a number of components customized to suit the design requirements of the proposed system. This optimization and evaluation process provides a basis by which the new system can be compared with traditional injection molding practices. Results confirm that the new multi-station system is less affected by the degree of product variety than traditional molding machines.

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Landgrebe, Dirk, Roland Müller, Rico Haase, Peter Scholz, Matthias Riemer, Andre Albert, Raik Grützner, and Frank Schieck. "Efficient Manufacturing Methods for Hybrid Metal-Polymer Components." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65621.

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Lightweight design for automotive applications gains more and more importance for future products, independent from the powertrain concept. One of the key issues in lightweight design is to utilize the right material for the right application using the right value at the right place. This results irrevocably in a multi-material design. In order to increase the efficiency in manufacturing car components, the number of single parts in a component is decreased by increasing the complexity. Examples for the state of the art are tailored welded blanks in cold forming, tailored tempering in press hardening or metallic inlays in injection molding of polymers. The challenge for future production scenarios of multi-material components is to combine existing technologies for metal- and polymer-based applications in efficient hybrid process chains. This paper shows initial approaches of hybrid process chains for efficient manufacturing of hybrid metal-polymer components. These concepts are feasible for flat as well as for tubular applications. Beside the creation of the final geometric properties of the component by a forming process, integrated joining operations are increasingly required for the efficiency of the production process and the performance characteristics of the final component. Main target of this production philosophy is to create 100% ready-to-install components. This is shown in three examples for hybrid process combinations. The first example deals with the combination of metal forming and injection molding of polymers. Example number two is the application of hybrid metal-polymer blanks. Finally, example number three shows the advantages of process integrated forming and joining of single basic components.

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Fetecau, Catalin, Felicia Stan, Nicoleta Violeta Cristea, and Laurentiu Ionut Sandu. "An Analysis of Interfacial Adhesion Between TPU/MWCNT Composites and ABS Substrate by Over Injection Molding." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8571.

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In this work, the advantages of Thermoplastic Polyurethane (TPU) filled with multi-walled carbon nanotubes (MWCNTs) were combined with those of the over injection molding process in order to obtain two-component (2k) structures with very different but high mechanical and electrical properties. TPU/MWCNT composites with different MWCNTs wt.% were over-molded onto Acrylonitrile Butadiene Styrene (ABS) substrates, under different processing conditions, and the adhesion was assessed by T-peel tests at room temperature. Since adhesion is also related to flow behavior, the rheological properties were studied with a capillary rheometer at shear rates similar to those of the injection molding process (102∼104s−1). Experimental results indicated that the most effective way to control the adhesion between the ABS substrate and the over-molded TPU/MWCNT composite is to increase the melt temperature. The addition of carbon nanotubes improves adhesion in the vicinity of 0.5 wt.% MWCNTs.

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Bejgerowski, Wojciech, and Satyandra K. Gupta. "Runner Optimization for In-Mold Assembly of Multi-Material Compliant Mechanisms." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48573.

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The runner system in injection molding process is used to supply the polymer melt from injection nozzle to the gates of final part cavities. Realizing complex multi-material mechanisms by in-mold assembly process requires special runner layout design considerations due to the existence of the first stage components. This paper presents the development of an optimization approach for runner systems in the in-mold assembly of multi-material compliant mechanisms. First, the issues specific to the in-mold assembly process are identified and analyzed. Second, the general optimization problem is formulated by identification of all parameters, design variables, objective functions and constraints. Third, the implementation of the optimization problem in Matlab® environment is described based on a case study of a runner system for an in-mold assembly of a MAV drive mechanism. This multi-material compliant mechanism consists of seven rigid links interconnected by six compliant hinges. Finally, several optimization approaches are analyzed to study their performance in solving the formulated problem. The most appropriate optimization approach is selected. The case study showed the applicability of the developed optimization approach to runner systems for complex in-mold assembled multi-material mechanism designs.

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8

Becker, Holger, and Claudia Gärtner. "Two-component injection molding for micofluidic devices." In SPIE MOEMS-MEMS, edited by Holger Becker and Bonnie L. Gray. SPIE, 2012. http://dx.doi.org/10.1117/12.910574.

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9

Weng, Feng-Tsai, Tsochu-Lin, and Yu-Yuan Lu. "Parameter analysis of lift component in injection molding." In 2018 IEEE International Conference on Applied System Innovation (ICASI). IEEE, 2018. http://dx.doi.org/10.1109/icasi.2018.8394369.

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10

Bici, Michele, Saber Seyed Mohammadi, and Francesca Campana. "A Compared Approach on How Deep Learning May Support Reverse Engineering for Tolerance Inspection." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11325.

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Abstract Reverse Engineering (RE) may help tolerance inspection during production by digitalization of analyzed components and their comparison with design requirements. RE techniques are already applied for geometrical and tolerance shape control. Plastic injection molding is one of the fields where it may be applied, in particular for die set-up of multi-cavities, since no severe accuracy is required for the acquisition system. In this field, RE techniques integrated with Computer-Aided tools for tolerancing and inspection may contribute to the so-called “Smart Manufacturing”. Their integration with PLM and suppliers’ incoming components may set the information necessary to evaluate each component and die. Intensive application of shape digitalization has to front several issues: accuracy of data acquisition hardware and software; automation of experimental and post-processing steps; update of industrial protocol and workers knowledge among others. Concerning post-processing automation, many advantages arise from computer vision, considering that it is based on the same concepts developed in a RE post-processing (detection, segmentation and classification). Recently, deep learning has been applied to classify point clouds, considering object and/or feature recognition. This can be made in two ways: with a 3D voxel grid, increasing regularity, before feeding data to a deep net architecture; or acting directly on point cloud. Literature data demonstrate high accuracy according to net training quality. In this paper, a preliminary study about CNN for 3D points segmentation is provided. Their characteristics have been compared to an automatic approach that has been already implemented by the authors in the past. VoxNet and PointNet architectures have been compared according to the specific task of feature recognition for tolerance inspection and some investigations on test cases are discussed to understand their performance.

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