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Relevant bibliographies by topics / Plastic injection molds

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Academic literature on the topic 'Plastic injection molds'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Plastic injection molds"

1

Chval, Zdenek, Karel Raz, and Frantisek Sedlacek. "Design of Injection Mold from Plastic Material." Key Engineering Materials 847 (June 2020): 75–80. http://dx.doi.org/10.4028/www.scientific.net/kem.847.75.

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This paper deals with the use of plastics for making injection molds. Mold production times reduced by 90% and costs cut by up to 75% are some of the benefits of prototype molds from plastic materials. Today, materials with melt temperatures above 300 °C are used for plastic molds. They include ABS, PE, PP and PA. In this study, testing of high-temperature resin from Formlabs was performed. Compression and tensile test data are compared with the datasheet values and with virtual simulations. The tests were carried out at different temperatures. Based on their results, one can identify a suitable molding process with molds from this material.

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Zhao, Zhen Yu, Long Liao, Fei Tang, and Bai Liu. "Moldflow Software in a Complex Plastic Shell Injection Mold Design." Applied Mechanics and Materials 29-32 (August 2010): 646–50. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.646.

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The paper describes the important role of Moldflow technology and status. Through the application of Moldflow / MPI (Moldflow Plastics Insight) software for CAE under a comprehensive analysis of the shell molds, injection molding parameters such as mold temperature, melt temperature, injection time and injection pressure are used to simulate the actual production process. This shows the Moldflow technology plays a significant role in the mold development process for optimizing plastic products design, plastic mold design and injection process parameters, etc.

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Li, Shan, Liang Xu, and Yu Qi Wang. "Design and NC Manufacturing of Plastic Injection Mold Based on UG Software." Advanced Materials Research 630 (December 2012): 163–66. http://dx.doi.org/10.4028/www.scientific.net/amr.630.163.

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On the platform of the UG Software’s CAD/MoldWizard/CAM components, the whole process of design and NC manufacturing of the plastic injection mold of a hair dryer’s shell was completed. The CAD/CAM process of the plastic injection mold was introduced by the practical application. The large advantage of the UG platform over the traditional method in the field of plastic injection molds’ design and manufacturing was reflected. The plastic injection molds’ design and manufacturing is a great challenge to the traditional design and manufacturing method, and the UG solutions can promote mold manufacturers’ ability of design and manufacturing remarkably.

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Mesquita, Rafael Agnelli, and Reinhold S. E. Schneider. "Tool Steel Quality And Surface Finishing of Plastic Molds." Exacta 8, no. 3 (February 16, 2011): 307–18. http://dx.doi.org/10.5585/exacta.v8i3.2442.

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Plastic industry is today in a constant growth, demanding several products from other segments, which includes the plastic molds, mainly used in the injection molding process. Considering all the requirements of plastic molds, the surface finishing is of special interest, as the injected plastic part is able to reproduce any details (and also defects) from the mold surface. Therefore, several aspects on mold finishing are important, mainly related to manufacturing conditions – machining, grinding, polishing and texturing, and also related to the tool steel quality, in relation to microstructure homogeneity and non-metallic inclusions (cleanliness). The present paper is then focused on this interrelationship between steel quality and manufacturing process, which are both related to the final quality of plastic mold surfaces. Examples are discussed in terms of surface finishing of plastic molds and the properties or the microstructure of mold steels.

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Mesquita, Rafael Agnelli, and Reinhold S. E. Schneider. "Tool Steel Quality And Surface Finishing of Plastic Molds DOI: 10.5585/exacta.v8i3.2442." Exacta 8, no. 3 (February 16, 2011): 307–18. http://dx.doi.org/10.5585/exactaep.v8i3.2442.

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Plastic industry is today in a constant growth, demanding several products from other segments, which includes the plastic molds, mainly used in the injection molding process. Considering all the requirements of plastic molds, the surface finishing is of special interest, as the injected plastic part is able to reproduce any details (and also defects) from the mold surface. Therefore, several aspects on mold finishing are important, mainly related to manufacturing conditions – machining, grinding, polishing and texturing, and also related to the tool steel quality, in relation to microstructure homogeneity and non-metallic inclusions (cleanliness). The present paper is then focused on this interrelationship between steel quality and manufacturing process, which are both related to the final quality of plastic mold surfaces. Examples are discussed in terms of surface finishing of plastic molds and the properties or the microstructure of mold steels.

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Luo, Guang Si. "Research on Three Dimensional Design of Cavity of Injection Molds of Involute Plastic Gears." Advanced Materials Research 472-475 (February 2012): 2859–63. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2859.

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The crux to the 3D design of cavity of injection molds for involute plastic gears is to solve the difficulty in zooming the cavity of molds and the accurate molding of the involute tooth profile. Researches have shown that the shrinkage of involute tooth profile is non-linear during the injection molding process of plastic gears. This paper presents the 3D design of cavity of injection molds for involute gears based on SolidWorks after offering an introduction to the relationship between the cavity tooth profile of injection molds for small-modulus plastic gears and the tooth profile of injection molding part.

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Kojima, Michio, Hiroyuki Narahara, Yoshiyuki Nakao, Hirofumi Fukumaru, Hiroshi Koresawa, Hiroshi Suzuki, and Satoshi Abe. "Permeability Characteristics and Applications of Plastic Injection Molding Fabricated by Metal Laser Sintering Combined with High Speed Milling." International Journal of Automation Technology 2, no. 3 (May 5, 2008): 175–81. http://dx.doi.org/10.20965/ijat.2008.p0175.

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This paper describes the results of fundamental experiments conducted by injection mold with permeability fabricated by Metal Laser Sintering Combined with High Speed Milling. Metal Laser Sintering Combined with High Speed Milling is attracting attention as a new mold fabrication approach. This machining method combines the metallic powder layer fabrication method with high-speed cutting. Since this process does not have the problem of tool L/D in usual cutting, it provides outstanding shape machining performance of deep ribs etc. Moreover, with this processing method, sintered density can be controlled by changing the exposure conditions of the laser beam, and gas permeable structures can also be manufactured. This fabrication method does not require the mold to be divided. From these features, this method is expected to offer such advantages as quick delivery of molds and low manufacturing costs. However, little is known about the application of laser sintered metallic molds which have gas permeability structure to plastic injection molding, and the practical use of these molds is not easy. The aim of this research was therefore to investigate the gas permeable structures realized by laser sintered metallic mold in plastic injection molding The results confirmed that permeable injection molds are effective for influencing residue air in products.

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Nemoto, Akihiko, Hitoshi Ohmori, Yasuhiko Murata, and Nobuhide Itoh. "Ultraprecision ELID-Grinding of Aspheric WC Lens Mold for Plastic Injection Molding." Key Engineering Materials 447-448 (September 2010): 155–58. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.155.

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To cope with increasing demands on ultraprecision profiling and finishing of aspheric lens molds, we have implemented an ultra/ nanoprecision aspheric grinding system to be mounted with an ELID- capability and on-line feedback capability of profile accuracy. A WC mold has successfully ground and finished to be with several nanometric surface smoothness and with ultraprecise profile accuracy by just grinding process with ELID mechanism. Some specific conditions have been investigated to achieve better accuracy and quality on molds. This paper presentation introduce those R&D activities and also discuss on the latest achievements on this topics, with showing injected aspheric lenses by the molds.

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Cao, Xiu Zhong. "Juice Extractor Stent Plastic Mould Structure Design." Applied Mechanics and Materials 214 (November 2012): 173–76. http://dx.doi.org/10.4028/www.scientific.net/amm.214.173.

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The design of plastic parts structure analysis, confirmed the mould adopts the exactly two cavities, with two points type surface, three board type injection molds. Exhaust systems use the parting surface and lateral slide block clearance, plunger, cooperate with clearance to exhaust, and using a runner filling mold overall layout form. In the mold design process, the design of classification, gating system, exhaust system, cooling system, demoulding mechanism, are introduced in this paper.

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Murata, Yasuhiko, and Masahiro Kuramochi. "Development of Heating and Cooling Injection Mold with Far-Infrared Radiation Heater." International Journal of Automation Technology 10, no. 1 (January 4, 2016): 79–86. http://dx.doi.org/10.20965/ijat.2016.p0079.

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Several rapid heating and cooling molding methods have been developed for practical use to improve the surface quality of plastic injection-molded products. These methods, however, need expensive equipment and complex molds that require vast know-how, and hence cannot be applied easily to actual production. In order to establish a molding method in which the mold’s cavity surfaces can easily be heated, we designed and manufactured a heating and cooling injection mold with a far-infrared radiation heater. Using this mold, we molded a high-impact polystyrene molded product, and found that the use of such a mold could lead to a decrease in the V-shaped groove depth of weld lines, as well as to an improvement in the transcription of the mold’s cavity surface quality onto the molded product. We also carried out tensile tests on the molded products to confirm whether the use of such a mold could increase the product’s elongation at break.

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Dissertations / Theses on the topic "Plastic injection molds"

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Bartlett, Leah Paige. "A Preliminary Study of Using Plastic Molds in Injection Molding." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1509440406290043.

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Carvalho, Ana Raquel Antunes. "Injecção de polímeros: peças técnicas." Master's thesis, Instituto Politécnico de Bragança, Escola Superior de Tecnologia e de Gestão, 2009. http://hdl.handle.net/10198/2536.

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Conceitos como polímeros, injecção de plástico, moldes, PPAP, (Production Part Approval Process) PPAP, fazem parte do dia-a-dia na Soplast. Um dia-a-dia rodeado de plásticos, um dia-a-dia cada vez mais semelhante ao nosso. Esta nova era de plásticos – tudo à nossa volta tem uma pequena componente plástica – ainda tem muito por descobrir e descodificar. No âmbito da candidatura ao grau de Mestre em Engenharia Química, promovido pela Escola Superior de Tecnologia e de Gestão de Bragança (ESTIG) do Instituto Politécnico de Bragança (IPB) foi realizado um trabalho de acompanhamento do desenvolvimento de uma peça plástica – desde a sua concepção em desenho até à fase final da peça plástica. Estas fases passam pela definição do molde, escolha da matéria-prima, entrega da documentação PPAP (oficial e exigida pela norma ISO TS 16949/2002) entre outros pontos. O estudo para esta tese realizou-se em período de trabalho, na empresa Soplast – Moura, Moutinho e Morais, Lda. Este trabalho pretende acompanhar o processo desde a fase de concepção/desenvolvimento até à fase final de uma peça plástica para a indústria automóvel – peças técnicas. Este documento pode ser considerado um auxílio para novos colaboradores da Soplast que podem aprender o modo de funcionamento da empresa e todos os processos de um novo projecto. Concepts like polymers, plastic injection, mold, PPAP (Production Part Approval Process) made part of all days in Soplast. Days surrounded by plastic, days more and more similar to ours. This new time of plastics - everything around us has a small plastic component - still has plenty to discover and decode. On application to Master degree in Chemical Engineering, sponsored by Escola Superior de Tecnologia e de Gestão de Bragança (ESTIG) from Instituto Politécnico de Bragança this work has been developed - monitoring the development of a plastic part from conception in drawing until the final stage of the plastic part. These phases pass to definition of the model, choice of raw materials, delivery of PPAP documentation (official and required by ISO TS 16949/2002), and others. The study for this thesis took place in working period in company Soplast – Moura, Moutinho e Morais, Lda. This work intends to follow the process from the design/development phase until the end of a plastic part for the automotive industry - technical parts. This document may be considered as aid for new employees that Soplast can have - they can understand how Soplast work in different departments.

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Crawford, Joseph Carlisle-Eric III. "Injection failure of stereolithography molds." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17687.

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LeBaut, Yann P. "Thermal aspect of stereolithography molds." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15991.

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Kočí, Ivan. "Návrh technologie výroby zátky z plastu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228882.

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This graduation theses analyse a concept of plastic plug production using the technology of injecting plastic into the form. There is performed a design of the technologic process with necessary calculations included here. Besides that the analysis is also focused on construction of the injection form. For the solution the 3D CAD system by SolidWorks and Hasco, Meusburger, Synventive normals were used. The graduation theses is finally valorized by technological-economic summary.

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Blair, Bryan Micharel. "Post-build processing of stereolithography molds." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19132.

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Ngonda, T. N. "A critical review of literature on cooling of injection moulds." Interim : Interdisciplinary Journal, Vol 6, Issue 2: Central University of Technology Free State Bloemfontein, 2007. http://hdl.handle.net/11462/409.

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Published Article
The paper presents a critical review of the techniques that are used to cool plastic injection moulds. It examines research on cooling of injection moulds by conventional cooling, the benefits and the limitations of the method. It compares the deployment mechanisms that have been proposed by various researchers. It also examines how the various mechanisms affect the plastic cooling rate and the overall heat transfer performance of the mould and how the various deployments affect the stress distribution of the mould and mould durability. The paper also presents the possibilities that have been presented by rapid prototyping. It discusses the development of conformal cooling as an alternative to conventional cooling. It presents the state of the art on the method. The paper presents the deficiencies in the current theories on conformal cooling and suggests areas that require further work in order to fully exploit the technique.

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Palmer, Anne Elizabeth. "The effect of feature geometry on the life of stereolithography molds." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18385.

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Cedorge, Thomas. "Surface roughness and draft angle effects on stereolithography molds." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18199.

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APPASAMY, SREERAM. "DEVELOPMENT OF HIGH THROUGHPUT PLASTIC MICROLENSES USING A REPLACEABLE INJECTION MOLD DISK." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1069880094.

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Books on the topic "Plastic injection molds"

1

Allyn, Edward P. Mold design I: (plastic injection molds). 2nd ed. Woodstock, NY: Allyn Air Publications, 1988.

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2

Walter, Michaeli, and Mohren Paul, eds. How to make injection molds. 3rd ed. Munich: Hanser, 2000.

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Paul, Mohren, ed. How to make injection molds. 2nd ed. Munich: Hanser Publishers, 1993.

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Menges, Georg. How to make injection molds. Munich: Hanser ; distributed in the United States by Macmillan, 1986.

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Menges, Georg. How to make injection molds. 3rd ed. Munich: Hanser, 2001.

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Flow analysis of injection molds. Munich: Hanser Publishers, 1995.

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1947-, Zheng Rong, ed. Flow analysis of injection molds. 2nd ed. Munich: Hanser Publishers, 2013.

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8

Babington, Mary F., Esther K. Palevsky, Tonia P. Bell, and Lori L. Mort. Injection molded plastics. Cleveland: Freedonia Group, 1999.

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E, Lindner, and Unger P, eds. Injection molds: 130 proven designs. 3rd ed. Munich: Hanser Publishers, 2002.

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Gastrow, Hans. Injection molds: 108 proven designs. 2nd ed. Munich: Hanser, 1993.

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Book chapters on the topic "Plastic injection molds"

1

Rees, Herbert, and Bruce Catoen. "The Plastic Product." In Selecting Injection Molds, 11–48. München: Carl Hanser Verlag GmbH & Co. KG, 2006. http://dx.doi.org/10.3139/9783446413023.002.

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Wunderlich, E. Dieter. "Injection Blow Molds." In Plastic Blow Molding Handbook, 515–31. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-6988-2_24.

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Martin-Doñate, Cristina, Sliman Shaikheleid, Abelardo Torres-Alba, and Jorge Manuel Mercado-Colmenero. "A New Smart Web Platform for Plastic Injection Molds in Industry 4.0 Environments." In Lecture Notes in Mechanical Engineering, 309–15. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_49.

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AbstractThis paper presents a new smart web platform for plastic injection molds for use in industry 4.0 environments. The new platform requires as its only input the CAD model of the plastic part in a discrete format, the accuracy of the analysis, the thermoplastic material of which the part will be manufactured and the number of parts to manufacture per year. Using this information and through a fully automated process based on hybrid algorithms developed by the authors the smart platform generates an extended CAD model of the mold with additional expert information useful for industry 4.0 environments. In this way, it is possible to design a mold with uniform heat transfer, balanced ejection and a uniform filling phase of the mold cavity. The presented platform differ from other applications for mold designing in that the resulting mold meets all the geometric, functional and technological requirements of mold designing without needing CAE simulation software for its validation. The presented platform is considered as the first smart platform that does not require the interaction of the designer in the process of dimensioning and designing the different subsystems that compound the mold, being a tool to reduce time and costs in the initial phases of plastic part design and with the ability to integrate into a flexible manufacturing environment 4.0.

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Jahan, Suchana A., Tong Wu, Yi Zhang, Jing Zhang, Andres Tovar, and Hazim El-Mounayri. "Effect of Porosity on Thermal Performance of Plastic Injection Molds Based on Experimental and Numerically Derived Material Properties." In Mechanics of Additive and Advanced Manufacturing, Volume 9, 55–63. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62834-9_8.

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Kazmer, David O. "Plastic Part Design." In Injection Mold Design Engineering, 21–42. München: Carl Hanser Verlag GmbH & Co. KG, 2016. http://dx.doi.org/10.3139/9781569905715.002.

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Kazmer, David O. "Plastic Part Design." In Injection Mold Design Engineering, 17–35. München: Carl Hanser Verlag GmbH & Co. KG, 2007. http://dx.doi.org/10.3139/9783446434196.002.

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Tinkham, S. E., and Wayne I. Pribble. "Injection Molds for Thermoplastics." In Plastics Mold Engineering Handbook, 358–476. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-6578-5_8.

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Lerma Valero, José R. "Mold Design Guide Recommendations." In Plastics Injection Molding, 218–30. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906903.017.

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Tinkham, S. E., Wayne I. Pribble, and Eric L. Buckleitner. "Injection Molds for Thermoplastics." In DuBois and Pribble’s Plastics Mold Engineering Handbook, 354–467. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-0253-8_8.

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Dealey, Robert. "Injection Mold Manufacturing." In SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 201–38. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-7604-4_7.

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Conference papers on the topic "Plastic injection molds"

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Bourque, David. "Manufacturing plastic injection optical molds." In Optical Engineering + Applications, edited by R. John Koshel, G. Groot Gregory, James D. Moore, Jr., and David H. Krevor. SPIE, 2008. http://dx.doi.org/10.1117/12.798467.

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Urabe, Kiyoshi, and Paul K. Wright. "Parting Direction and Parting Planes for the CAD/CAM of Plastic Injection Molds." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/dfm-4336.

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Abstract We describe a plastic injection mold making agent that is part of a domain unified computer-aided design environment. This environment enables concurrent design of the “to-be-molded” part, by facilitating communication between electrical and mechanical engineering CAD tools. Once the design is completed and certain constraints are satisfied, the design is passed to the mold making agent. After the designer inputs some mold parameters, the mold agent automatically determines the parting direction and parting plane, and generates the mold halves. This is achieved by applying a set of heuristic rules on the part geometry. These rules, design constraints, and methods used to generate the mold are discussed. Resulting mold halves have been fabricated on a 3 axis milling machine using CAD / CAPP / CAM tools described in this paper. Examples of aluminum molds and sample output from the mold making agent are presented.

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Claveria, I., C. Javierre, A. Ferna´ndez, and J. Castany. "Computer Aided System for Semiautomatic Injection Mould Design." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79212.

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Injection molding field has become one of the most important polymer manufacturing areas. One of the elements that plays a very important role in the injection molding process is the mold from which plastic part is obtained. The quality of the final product, depends highly on the proper design of the mold. A software to design injection molds following a design methodology has been developed. It allows the user both, to follow a suitable design itinerary for the mold design including plates, guiding system, ejection system, sliding cores, etc, and to eliminate the repetitive tasks of drawing the different mold elements. The software has been implemented by using PRO/TOOLKIT functions and a Visual C++ environment, and it is supported by PRO/ENGINEER. The usage of the software saves design time at ante project stage and it can be also used as a tool to check the feasibility of the mold according to the part to be manufactured.

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Beheshtian Mesgaran, Saeed, Farzad Elhami Nik, and Seyyed Emad Seyyed Mousavi. "Experimental and Numerical Analysis of Burn Marks and Shrinkage Effect on Injection Molding." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-3009.

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Injection Molding is among the most popular processes in plastic parts production. Through this process, burn marks and shrinkage play the most significant role in decreasing surface quality as well as increasing costs, especially when manufacturers use this method in order to produce thin-walled plastic parts. In this paper, a new strategy to remove the defects caused by shrinkage and burn marks has been proposed for the injection molding process of a specific plastic part which is used to keep the doors of an automobiles open during the painting process. Burn marks caused by the trapped air inside thin walls of the part were first simulated in MOLDFLOW 2010 software. Next step is to compare the simulation results to results that are obtained from experimental analysis. Then, Burn marks and shrinkage effects were eliminated by optimization of the process which includes mold design revision by means of SOLIDWORKS software, modification of the simulation in MOLDFLOW and the mold modification in workshop environment by improvising some ejector pins in certain points. Furthermore, shrinkage amount of the part after cooling process was calculated by applying Finite Element Method (FEM) and obtained results were used to optimize the design of the mold. Results demonstrate that mold design optimization would be possible through designing flawless molds that contain certain points for trapped air discharge and calculating shrinkage amount by FEM for optimization of design procedure. Results consequently decrease costs as well as providing surface quality improvement.

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Martens, Thomas, and Laine Mears. "Micro Feature Enhanced Sinter Bonding of Metal Injection Molded (MIM) Parts to Solid Substrate." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50129.

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In MIM, fine metal powders are mixed with a binder and injected into molds, similar to plastic injection molding. After molding, the binder is removed from the part, and the compact is sintered to almost full density. The obstacle to sinter bonding a MIM part to a conventional (solid) substrate lies in the sinter shrinkage of the MIM part, which can be up to 20%, meaning that the MIM part shrinks during sintering, while the conventional substrate maintains its dimensions. This behavior would typically inhibit bonding and/or cause cracking and deformation of the MIM part. A structure of micro features molded onto the surface of the MIM part allows for shrinkage while bonding to the substrate. The micro features tolerate certain plastic deformation to permit the shrinkage without causing cracks after the initial bonds are established. In a first series of tests, bond strengths of up to 80% of that of resistance welds have been achieved. This paper describes how the authors developed their proposed method of sinter bonding and how they accomplished effective sinter bonds between MIM parts and solid substrates.

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Chen, Jie, and Ranga Pitchumani. "Computational Modeling of Polymer Flow in Microcavities Through a Microscreen." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38675.

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This paper investigates a new technique for rapid replication of electroforming micromolds with integral microscreens. The process is based on injection molding or hot embossing of plastic replicates with integral metallic screens onto a LIGA-fabricated master microtool, to produce sacrificial electroforming molds in which the metallic screen acts as the conducting base and the plastic features provide insulating sidewalls for electrodeposition of the desired metallic micropart. A computational model is developed for the polymer flow during the fabrication of electroforming micromolds incorporating the temperature dependent, non-Newtonian rheology of the polymer melts. The model is used to analyze the effects of the process parameters and micro-feature geometry on the polymer flow patterns.

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Pinarbasi, Ahmet, Gregory S. Layser, and John P. Coulter. "Numerical Simulation of Polymer Melt Flow Control for a Multi-Cavity Mold During Injection Molding Processes." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55409.

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Process control is an important factor for improving the performance and consistency of thermoplastic parts manufactured by injection molding processes. A critical process parameter for manufacturing of high quality plastic parts is cavity pressure. This paper presents direct numerical simulation results of a new manufacturing concept developed to improve injection molding processing for all runner types by monitoring shot to shot product quality and controlling the filling of multi-cavity molds in real time. A cold runner system supplying polymer melt to a two-cavity mold incorporating mechanical valves in the runner systems was modeled. Each valve was controlled independently to meter flow and pressure to its portion of the mold. Simulations were performed for two different materials: PPS Ryton R-4-200 and LCP Vectra E130D-2. Shear-rate dependence of viscosity of the materials is modeled through the Cross rheological equation. Flow rates and maximum shear-rates through valves were calculated and the results of the simulations were analyzed to validate the concept of individual cavity filling modification. Flow through one valve system leading to a single cavity was simulated first, followed by flow through two-valve system for filling two cavities. For one valve simulations, pressure at the inlet was specified, whereas for flow through two-valve system, volumetric flow rate at the inlet was supplied for simulations. It was concluded that the flow control concept developed was numerically validated, and it was shown that the valve system proposed here is applicable to control melt flow through cavities at industrial manufacturing facilities. The future directions for the continuing project are also discussed.

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Zhang, Bin, Bob Tarantino, and Samuel C. Lieber. "Effect of Metal Additive Manufacturing on the Engineering Design of Manufacturing Tooling: A Case Study on Dies for Plastic Extruded Products." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71534.

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Metal Additive Manufacturing (MAM) has had a tremendous impact in reimagining the design and manufacture of products in a number of industries. The use of MAM to directly produce products continues to be investigated; however, the area of manufacturing tooling has yet to be fully explored. MAM provides a unique opportunity to introduce features that make manufacturing tooling better equipped to efficiently produce complex products. A recent example includes MAM produced molds for the injection molding industry. MAM, in this case, provides the ability to introduce unique features, such as cooling channels, that could not be introduced practically with SM processes. This study explores the use of MAM towards the engineering and design of Extrusion Die Tooling for plastic extruded products. Plastic extrusion is a high-volume manufacturing process for a broad range of products from tubing to window frames. These extruded plastic products come in not only a range of sizes, but also different polymer materials. A series of extrusion dies are currently needed in the process in order to achieve the final shape of the product. These dies are effectively designed in two dimensional Computer Aided Design (CAD) packages, because of the current preferred method of fabrication, wire Electrical Discharge Machining (EDM). This study explores the effect of MAM on the extrusion die engineering design process. The explored cases center on common extruded plastic products including tubing and constant wall U-channels. The study first describes how sets of extrusion dies are currently designed in CAD in order to produce the desired extruded product features with established advanced manufacturing processes (EDM). The study then details the effect of using the MAM alternative on the design process, CAD methods selected, and the extrusion die features. The impact of MAM on the extruded die design process are discussed in order to provide guidelines for when it should be considered in order to effectively achieve features on the described extruded plastic products.

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Kamalrudin, Massila, Sharmini Mohan, Liew Pay Jun, and Rosmiza Wahida Abdullah. "The mold cost estimation calculator for plastic injection mold manufacturing." In 2008 International Symposium on Information Technology. IEEE, 2008. http://dx.doi.org/10.1109/itsim.2008.4631859.

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Fisher, David, and Ron Hofmann. "CNC machining plastic injection mold plates in the classroom." In 2007 37th annual frontiers in education conference - global engineering: knowledge without borders, opportunities without passports. IEEE, 2007. http://dx.doi.org/10.1109/fie.2007.4417886.

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