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Relevant bibliographies by topics / Molds

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Academic literature on the topic 'Molds'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 June 2025

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Journal articles on the topic "Molds"

1

Hopmann, Ch, and P. Nikoleizig. "Inverse thermal mold design for injection molds." International Journal of Material Forming 11, no. 1 (2016): 113–24. http://dx.doi.org/10.1007/s12289-016-1334-3.

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MISLIVEC, PHILIP B., VERNEAL R. BRUCE, MICHAEL E. STACK, and RUTH BANDLER. "Molds and Tenuazonic Acid in Fresh Tomatoes Used for Catsup Production." Journal of Food Protection 50, no. 1 (1987): 38–41. http://dx.doi.org/10.4315/0362-028x-50.1.38.

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The mold flora was determined for 146 samples of fresh but visibly moldy tomatoes collected from sorting belts in tomato catsup processing plants in California and in Midwestern and Eastern United States. Mold found in 141 of the samples included at least 22 genera, principally Alternaria, Aspergillus, Cladosporium, Fusarium and Penicillium, and 51 species. The California tomatoes were dominated by Geotrichum candidum and species of Aspergillus and Penicillium; Midwest and East tomatoes were dominated by Alternaria. This suggested that the predominant molds in tomatoes may differ, depending on geographical source. Tenuazonic acid (TA), a toxic metabolite of Alternaria spp., was found in 73 of the samples at a range of 0.4 to 69.7 (average 4.94) μg/g of moldy tissue; however, Alternaria spp. were not found in 35 of the 73 TA-positive samples. It is possible that other molds may produce TA or that the toxin-producing Alternaria died off before our sampling.

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Deng, Qi Lin, K. K. Sun, G. C. Zhou, Jian Li Song, Y. Wang, and De Jin Hu. "Research on Surface Quality Control of Moulds Formed by Plasma Arc Spraying." Materials Science Forum 471-472 (December 2004): 620–24. http://dx.doi.org/10.4028/www.scientific.net/msf.471-472.620.

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Rapid manufacturing moulds by plasma arc spraying is a new kind of plasma arc machining technology. This technology has many advantages. An experimental apparatus has been set up. The influence of some special factors on the surface quality of work moulds formed by plasma arc spraying have been analyzed and experimentally researched. The micro structure of the interface between master moulds and work moulds shows that work moulds copy geometrically master moulds very well after optimizing processing parameters. Some experimental samples by plasma arc spraying have been obtained. They show that the surface patterns of work moulds match with the ones of master molds very well.

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Jorge, Diogo Pina, and Paulo Peças. "MAPEAMENTO DO PROGRESSO DE MOLDES – UMA FERRAMENTA DE GESTÃO VISUAL PARA A INDÚSTRIA 4.0." Revista Produção e Desenvolvimento 4, no. 1 (2018): 68–81. http://dx.doi.org/10.32358/rpd.2018.v4.312.

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The planning of injection molds production is a complex task where the classic planning approaches has proven limitations because of the following particular characteristics: the mold expands in a myriad of components for production; the “one-of-a-kind” type of production and recurrent mold design changes asked by the customer. To overcome this challenge a methodology to Molds Production progress Mapping is proposed (MPM). The methodology was built on the authors experience in collaborating with mold making companies, on the principles of lean manufacturing and visual management (VM) and also have in mind the trend towards production digitalization to be aligned with Industry 4.0 evolution. As a VM tool to support molds production planning, the MPM shows the instant progress of each mold, the deviation from planning and the remaining time for the due date. The user has “only” to input the mold’s components critic level and the relative weight of each production process in the total time; it also requires that the production process are armed with sensors and the production task are digitalized and compiled in the information management system. The MPM can also be used in other complex production systems.

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Ameen, Hani Aziz, and Khairia Salman Hassan. "EFFECT OF THE SAND MOULD ADDITIVES ON SOME MECHANICAL PROPERTIES OF CARBON STEEL CK45 CASTS." Journal of Engineering 17, no. 04 (2011): 729–39. http://dx.doi.org/10.31026/j.eng.2011.04.08.

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The research targets study of influence of additives on sand mold’s properties and, consequently, onthat of carbon steel CK45 casts produced by three molds. Three materials were selected for additionto sand mix at weight percentages. These are sodium carbonates, glycerin and oat flour. Sand moldsof studied properties were produced to get casts from such molds. The required tests were made tofind the best additives with respect to properties of cast. ANSYS software is used to demonstratethe stresses distribution of each produced materials. It is shown that the mechanical properties ofcasts produced is improved highly with sodium carbonates and is less with oat flour and it is seem afew with glycerin additives. It can be concluded that the sodium carbonates let to get the castproduced with highly mechanical properties.

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Wallich, Paul. "Molecular Molds." Scientific American 275, no. 5 (1996): 45–46. http://dx.doi.org/10.1038/scientificamerican1196-45.

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Mayne, A. J., L. Soukiassian, N. Commaux, G. Comtet, and G. Dujardin. "Molecular molds." Applied Physics Letters 85, no. 22 (2004): 5379–81. http://dx.doi.org/10.1063/1.1829163.

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Artemenko, S. E., V. I. Besshaposhnikova, and O. M. Sladkov. "Polymer molds." Fibre Chemistry 29, no. 3 (1997): 218–19. http://dx.doi.org/10.1007/bf02400411.

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Wong, Eunice H., and Sanjay G. Revankar. "Dematiaceous Molds." Infectious Disease Clinics of North America 30, no. 1 (2016): 165–78. http://dx.doi.org/10.1016/j.idc.2015.10.007.

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Jin, Hong Ju, Sungyoon Jang, Han Seul Kim, and Myeong Seong Lee. "Material Characteristics and Manufacturing Techniques Interpretation for the Casting Molds from the Silla Urban Site of Hwangnyongsa in Gyeongju, Korea." Journal of Conservation Science 39, no. 2 (2023): 152–64. http://dx.doi.org/10.12654/jcs.2023.39.2.05.

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This study investigates the material characteristics of casting molds found at the Silla urban site of Hwangnyongsa in Gyeongju to interpret manufacturing techniques of casting mold for bronze used in the Unified Silla period. The casting molds appear to be earthen molds for bronze-making, with a thick ceramic wall and are classified into inner and outer mold types. The molds show a layered structure, with a silt layer thinly applied to the earthen mold surface. This layer comes into contact with melted metal during bronze manufacturing and is located on the outside of inner molds and inside of outer molds. The paste layer exhibits fine-grained texture with a bimodal structure. Thin section analysis reveals planar voids in the paste, which were made by the carbonization of rice husks used as a temper during the firing process. The silt layer is mainly composed of very fine-grained quartz and feldspars without clay and plant tempers. It is estimated that the casting molds were made by mixing soil with tempers of minerals and rice husks, applying a silt layer to the surface of the molds, and experiencing temperatures below 1,000℃. Overall, the selection of different raw materials for each layer of the molds is connected with efficiency to ensure the permeability and thermal resistance during the casting process and easy release of the bronze object from the molds.

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Dissertations / Theses on the topic "Molds"

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Bareta, Deives Roberto. "Estudo comparativo e experimental de materiais aplicados a insertos macho de moldes de injeção dentro do conceito de molde híbrido." reponame:Repositório Institucional da UCS, 2007. https://repositorio.ucs.br/handle/11338/209.

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O uso de componentes injetados de plástico aumentou nos últimos anos na maioria dos segmentos industriais. Como resultado, os processos envolvidos no projeto e na fabricação de moldes de injeção ganharam uma significativa atenção devido a grande complexidade, necessidade de baixo custo e, principalmente, curto tempo de manufatura. O uso de técnicas de Prototipagem e Ferramental Rápido (Rapid Prototyping/Rapid Tooling) surgiram como opções para esse setor, visando à rápida obtenção de peças protótipos. Porém, um dos desafios ainda presente está em garantir que as peças protótipos resultantes dessas técnicas atendam todas as dimensões solicitadas em aplicações reais. Este trabalho aborda a aplicação de materiais alternativos para a fabricação de moldes híbridos de injeção, dentro do conceito de Ferramental Rápido, com o objetivo de contribuir para uma melhor compreensão da influência desses materiais na qualidade final das peças protótipos obtidas. Um molde experimental, instrumentalizado com sensores de temperatura e, com uma das cavidades intercambiável, foi projetado e manufaturado para a injeção de uma peça de referência. As diferentes propriedades dos materiais utilizados na cavidade intercambiável, principalmente as propriedades térmicas, foram analisadas, bem como a influência dessas no produto final. Doze configurações diferentes (material da cavidade temperatura do molde) foram definidas para a obtenção de amostras. O experimento foi definido com o apoio de simulação matemática computacional. As amostras obtidas foram analisadas com relação as suas propriedades mecânicas (resistência ao impacto e à tração), propriedades físicas (dimensionamento, estudo morfológico e de cristalinidade) e propriedades químicas onde o grau de contaminação por metais pesados foi avaliado. As conclusões obtidas nesse trabalho mostram a importância da influência do material da cavidade do molde, e apresentam uma correlação das diferentes variáveis de processo com as propriedades obtidas nas peças protótipos injetadas através de técnica de Ferramental Rápido.<br>Submitted by Marcelo Teixeira (mvteixeira@ucs.br) on 2014-05-14T19:23:43Z No. of bitstreams: 1 Dissertacao Deives R Bareta.pdf: 9212045 bytes, checksum: 2808a91c52ab325c093e19f6e0199ed0 (MD5)<br>Made available in DSpace on 2014-05-14T19:23:43Z (GMT). No. of bitstreams: 1 Dissertacao Deives R Bareta.pdf: 9212045 bytes, checksum: 2808a91c52ab325c093e19f6e0199ed0 (MD5)<br>The application of plastic components has grown significantly in most of industrial segments during last years. This has attracted considerably attention for the injection mould design and manufacturing processes, which is one of the most expensive phases of injected plastic components development process. Techniques such as Rapid Prototyping/Rapid Tooling have appeared as potential solution in the field. However, one issue not resolved is how the prototypes obtained by these techniques can attend all features demanded by a true prototype. This research explores the application of softer alternative material to hybrid prototype injection moulds within the concept of rapid tooling, providing a better understanding about the influence of these materials in the final properties of plastic injected prototypes. An experimental injection mould, assembled with temperature sensors, and with interchangeability of the moulding blocks (core and cavity) has been designed and manufactured based on a tubular reference component. The different properties of the core materials, in special thermal, have been analyzed, as well as their influence on the reference component. A set of twelve configurations (core material mould temperature) have been defined to obtain the samples. Mathematical computational simulation was used to identify the more appropriate injection moulding parameters. The final samples have been analyzed in terms of mechanical properties (stress-strain and impact), physical properties (dimensions, morphology and crystallinity) and chemical properties. The conclusions show the influence of alternative materials, applied to core injection mould, on the final injected components. Also, a relationship between the different injection moulding parameters and the final prototype component properties are discussed.

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Mintz-Cole, Rachael A. "Mold Induced Asthma: Not all Molds are Created Equal." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1353951649.

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Heiderich, Danilo Carvalho. "Desenvolvimento de molde de material cerâmico para aplicação em moldagem por injeção de materiais poliméricos." Universidade Presbiteriana Mackenzie, 2014. http://tede.mackenzie.br/jspui/handle/tede/1348.

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Made available in DSpace on 2016-03-15T19:36:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-10-15<br>Universidade Presbiteriana Mackenzie<br>The need for speed increasing production, reducing weight and price of the product and the need for creation of complex parts made the use of polymeric materials, increasingly feasible in relation to other materials. The implementation of polymeric materials in various areas of production ensure the continued development of techniques for forming the same, with advances in technology also creates the need to increase the speed of transition between the development stages of a project as well as reducing the costs involved to achieve project deadlines and keep it commercially competitive. In view of the mechanical properties of ceramic material and its ease of forming was objective the creation of a plastic injection mold made of ceramic material. For this we performed a brief study of the main means of forming polymer and a study on the properties of ceramic and polymeric materials. Was later developed the part to be injected, and from the same, the ceramic mold that is used. After scaling the same calculations were made to adapt the project to verify its viability and the process of analysis by finite elements. These results show that the injection pressure and the necessary clamping force are below the maximum forces, supported by ceramic material, which demonstrates the viability of the ceramic mold, as an alternative to traditional metal molds.<br>A necessidade de velocidades de produção cada vez maiores, redução de pesos e preço do produto e a necessidade da criação de peças complexas tornaram o uso de materiais poliméricos, cada vez mais viável em relação aos demais materiais. A implementação dos materiais poliméricos nas mais diversas áreas de produção implica no desenvolvimento contínuo das técnicas de conformação dos mesmos, porém com os avanços tecnológicos cria-se também a necessidade de aumentar a velocidade de transição entre as etapas de desenvolvimento de um projeto bem como a redução dos custos envolvidos no processo a fim de atingir os prazos do projeto e mantê-lo comercialmente competitivo. Tendo em vista as propriedades mecânicas do material cerâmico bem como sua facilidade de conformação objetivou-se a criação de um molde para injeção de plásticos feito de material cerâmico. Para isso foi realizado um breve estudo sobre os principais meio de conformação de polímeros também um estudo sobre as propriedades dos materiais cerâmicos e poliméricos. Posteriormente foi desenvolvida a peça a ser injetada e, a partir da mesma, o molde cerâmico que será utilizado. Após o dimensionamento do mesmo foram realizados os cálculos de adequação do projeto para verificar a sua viabilidade bem como a análise pelo processo de elementos finitos. Os resultados deste estudo mostram que as pressões de injeção bem como a força de fechamento necessária são inferiores às forças máximas, suportadas pelo material cerâmico, o que demonstra a viabilidade da criação do molde cerâmico, como alternativa aos moldes metálicos tradicionais.

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Russell, Carrie L. "Comparison of culturable/viable airborne mold and total mold spore sampling results in single-family dwellings." Virtual Press, 2002. http://liblink.bsu.edu/uhtbin/catkey/1233192.

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This study was conducted to determine and compare indoor mold concentrations of total mold, five target taxa, and unidentified mold taxa using culturable/viable mold sampling (on DG-18 and MEA) and total mold spore sampling concurrently. Samples were taken within two locations of 22 single-family dwellings. Paired comparisons of culturable/viable mold concentrations revealed that DG- 18 samples had significantly higher total colony counts than MEA samples and near significantly higher counts of Aspergillus. Total mold spore concentrations were an average of 16-21 times greater than culturable/viable mold concentrations. The use of both sampling techniques concurrently allowed apparent viability ratios to be calculated. Significant differences in apparent viability were observed on the two media for total mold and Cladosporium, and near significance for Aspergillus; higher ratios were observed using DG-18. These studies indicate that DG-18 may be a superior medium for culturable/viable mold sampling and significant apparent viability differences exist among mold taxa quantified.<br>Department of Natural Resources and Environmental Management

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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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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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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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Rode, Lori A. "Mold identification and prevention in Wisconsin schools." Online version, 2002. http://www.uwstout.edu/lib/thesis/2002/2002rodel.pdf.

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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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Hulvey, Jonathan P. "Morphology and phylogeny of the oomycete genus Saprolegnia /." Electronic version (Microsoft Word), 2005. http://dl.uncw.edu/etd/2005/hulveyj/jonathanhulvey.doc.

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Books on the topic "Molds"

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

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Unger, Peter, ed. Gastrow Injection Molds. Carl Hanser Verlag GmbH & Co. KG, 2006. http://dx.doi.org/10.3139/9783446412842.

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Rees, Herbert, and Bruce Catoen. Selecting Injection Molds. Carl Hanser Verlag GmbH & Co. KG, 2006. http://dx.doi.org/10.3139/9783446413023.

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Pruner, Harry, and Wolfgang Nesch. Understanding Injection Molds. Carl Hanser Verlag GmbH & Co. KG, 2013. http://dx.doi.org/10.3139/9781569905357.

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author, Nesch Wolfgang, ed. Understanding injection molds. Hanser Publications, 2013.

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Viegas, Jennifer. Fungi and molds. Rosen Pub. Group, 2004.

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Rees, Herbert, and Bruce Catoen. Selecting Injection Molds. Carl Hanser Verlag GmbH & Co. KG, 2006. http://dx.doi.org/10.1007/978-3-446-41302-3.

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Unger, Peter, ed. Gastrow Injection Molds. Carl Hanser Verlag GmbH & Co. KG, 2006. http://dx.doi.org/10.1007/978-3-446-41284-2.

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Pruner, Harry, and Wolfgang Nesch. Understanding Injection Molds. Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.1007/978-1-56990-844-0.

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Steve, Parker. Molds, mushrooms & other fungi. Compass Point Books, 2009.

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Book chapters on the topic "Molds"

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Throne, James L. "Molds and Mold Design." In Understanding Thermoforming. Carl Hanser Verlag GmbH & Co. KG, 2008. http://dx.doi.org/10.3139/9783446418554.007.

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Horst, R. Kenneth. "Molds." In Westcott's Plant Disease Handbook. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-2141-8_36.

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Jaroschek, Christoph. "Molds." In Design of Injection Molded Plastic Parts. Carl Hanser Verlag GmbH & Co. KG, 2022. http://dx.doi.org/10.3139/9781569908945.003.

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Jaroschek, Christoph. "Molds." In Design of Injection Molded Plastic Parts. Carl Hanser Verlag GmbH & Co. KG, 2022. http://dx.doi.org/10.1007/978-1-56990-894-5_3.

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Pribble, Wayne I., and Eric L. Buckleitner. "Compression Molds." In DuBois and Pribble’s Plastics Mold Engineering Handbook. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-0253-8_6.

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Pribble, Wayne I. "Compression Molds." In Plastics Mold Engineering Handbook. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-6578-5_6.

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Horst, R. Kenneth. "Slime Molds." In Westcott's Plant Disease Handbook. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-2141-8_45.

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Throne, James L. "Thermoforming Molds." In Technology of Thermoforming. Carl Hanser Verlag GmbH & Co. KG, 1996. http://dx.doi.org/10.3139/9783446402478.006.

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Meena, Mukesh, Rahul Kumar, and Prashant Swapnil. "Slime Molds." In Encyclopedia of Animal Cognition and Behavior. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-47829-6_1334-1.

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Meena, Mukesh, Rahul Kumar, and Prashant Swapnil. "Slime Molds." In Encyclopedia of Animal Cognition and Behavior. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-319-55065-7_1334.

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Conference papers on the topic "Molds"

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Huang, Jun, and Satyandra K. Gupta. "Accessibility Driven Spatial Partitioning for Generating Sacrificial Multi-Piece Molds." In ASME 2002 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/detc2002/dfm-34173.

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This paper describes an algorithm based on accessibility-driven partitioning approach to the design of sacrificial multi-piece molds. We construct gross shape of the mold by subtracting the part model from the mold enclosure and analyze its accessibility. The gross mold shape is partitioned using accessibility information. Each partitioning improves accessibility and we produce a set of mold components that are accessible and therefore can be produced using milling and drilling operations. Our approach has the following advantages. First, by using multi-piece molds we can create geometrically complex objects that are impossible to create using traditional two-piece molds. Second, we make use of sacrificial molds. Therefore, using multi-piece sacrificial molds, we can create parts that pose disassembly problems for permanent molds. Third, mold design steps are significantly automated in our methodology. Therefore, we can create the functional part from the CAD model of the part in a matter of hours and so our approach can be used in small batch manufacturing environments.

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Gupta, Satyandra K., and Alok K. Priyadarshi. "Towards Automated Design of Multi-Piece Permanent Molds." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/dac-48725.

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Multi-Piece molds, which consist of more than two mold pieces, are capable of producing very complex parts—parts that cannot be produced by the traditional molds. The tooling cost is also low for multi-piece molds, which makes it an ideal candidate for pre-production prototyping and bridge tooling. However, designing multi-piece molds is a time-consuming task. This paper describes geometric algorithms for automated design of multi-piece molds. A Multi-Piece Mold Design Algorithm (MPMDA) has been developed to automate several important mold-design steps: finding parting directions, locating parting lines, creating parting surfaces, and constructing mold pieces. MPMDA constructs mold pieces based on global accessibility analysis results of the part and therefore guarantees the disassembly of the mold pieces. A software system has also been developed and successfully tested on several complex industrial parts.

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Yulianto, Agus, Agung Setyo Darmawan, A'an Candra Mustika, Bambang Waluyo Febriantoko, and Patna Partono. "Characterization of Gray Cast Iron with the Addition of 3 Wt.% FeMn in the Casting Process with Metal Molds and Sand Molds." In 6th International Conference on Advanced Materials Science. Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-rt48g1.

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This study aims to determine how the effect of inoculation of manganese (FeMn) on the hardness value, the results of microstructure photos, and the results of the Scanning Electron Microscopy Energy Dispersive X-ray Spectroscopy, test on gray cast iron material with the addition of 3% FeMn. In this casting process using an induction smelting furnace with a temperature of 1300 – 1400 C the material used for smelting is iron (Fe), melted and then mixed with 3%. FeMn after mixed poured into metal molds and prepared sand. The results of the hardness test showed that the hardness values vary in the upper, lower, and intermediate metal molds. The results of microstructure testing of metal molds, transitional molds, and sand molds at the bottom are the hardest because the graphite is neatly arranged and clearly visible. The results of the Scanning Electron Microscopy Energy Dispersive X-ray Spectroscopy test of the Mn element in the metal mold was detected at 3.45% and in the sand mold at 0.00%, the Mn sand mold was actually detected on the graph but did not appear in the data table because it was covered by Fe, C, and Si elements.

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STARK, WALTER, NADIA HANNON, TIMOTHY YAP, NATHANIEL HEATHMAN, and MEHRAN TEHRANI. "HEATED ADDITIVELY MANUFACTURED MOLDS FOR THERMOPLASTIC COMPOSITE AUTOMATED FIBER PLACEMENT." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36469.

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Thermoplastic composite (TPC) tapes can be consolidated in situ via automated fiber placement (AFP) at relatively high temperatures (>250°C) and local pressures (up to a few MPa). In situ consolidation of TPC parts requires special tooling and heated molds to prevent warping. Creating complex three-dimensional (3D) molds at a low cost and in a short time frame can facilitate TPC AFP adoption and entry into new markets requiring customized parts. The industry standard for mold manufacturing is milling or bending metal stock (typically invar, steel, or aluminum). This process can be costly and have lead times upwards of two months. Additive manufacturing can shorten the lead times significantly. Additively manufactured molds, to be used by TPC AFP, should withstand high temperatures and roller pressures. Current mold generation practices do not have a method of heating the mold surface necessary for dimensional accuracy of TPC tape-based parts. This paper investigates a process to create 3D molds via fused filament fabrication (FFF), a form of material extrusion additive manufacturing (AM), and high-performance materials that can withstand the temperatures and pressures of thermoplastic AFP application. FFF offers customized parts quickly and at a low cost. A laser-assisted AFP robot performed a layup over two heated FFF molds made of short carbon fiber reinforced polyetherketoneketone (CFPEKK), a flat plate and one with a one-axis curvature. These specimens performed well with no noticeable permanent deformation of the mold caused by either the roller or the laser demonstrating the viability of this mold generation process to create 3D molds usable with TPC AFP.

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Alam, M. K., P. Klein, and D. Garg. "Simulation of Thermal Transport in a Nanocomposite Blow Mold." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88265.

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In this study, the thermal transport issues for a nanocomposite material used in the blow molding process are addressed in the fabrication of the composite mold. For low production cycles, there is a significant interest in using lower cost composite molds to replace the expensive traditional metal molds used for making polymer parts by the blow molding process. A critical issue in using a polymer matrix composite as an alternative to a metal mold is the large difference in the thermal transport property. The composite mold design must integrate enhanced cooling so that the product can cool sufficiently within each cycle time. Nanocomposites that use carbon nanofiber offer improvements in thermal and mechanical properties; therefore they are potential candidates for making molds for polymer products. This paper describes the design of the cooling system for a nanocomposite blow mold using numerical simulations; and the processing steps by which the design is incorporated in the fabrication of the mold.

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Kosnik, Sabrina, and Davide Piovesan. "Polymeric Reaction Molding of Biocompatible Materials: Lessons Learned." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8465.

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Abstract Polymeric materials are often used as structural binders for biomedical applications. The mechanical properties of the material strongly depend on the fabrication process. To this end, we illustrate a set of casting methods for the production of samples to be tested via destructive methods. The curing process of the artifact was controlled during fabrication, and the molds were also made of polymeric materials. The fabrication of molds is illustrated where particular emphasis is posed on the manufacturing and testing of silicone molds using off-the-shelf material. Cyanoacrylate (CA), Epoxy resin (EP) and Methacrylate ester monomers (MEMs) artifacts have been fabricated using said molds. Of the aforementioned resins, MEMs are a class of thermosetting biocompatible polymers in which fabrication is especially problematic because of the very narrow temperature window at which the monomers polymerize. This research analyzes the casting process of curable materials highlighting the setbacks of using plastic-based molds. Among the cast based manufacturing techniques, specific focus was given to the case where MEMs is made to polymerize in a silicone mold controlling the temperature of the environment. The thermal properties that the silicone-based molds require for the appropriate curing of the polymer are analyzed. It was found that due to the very high heat capacity of silicone, the regulation of the temperature within the mold is difficult often exciding the boiling point of the casted resin.

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Li, Xuejun, and Satyandra K. Gupta. "A Step Towards Automated Design of Rotary-Platen Multi-Shot Molds." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/dfm-48168.

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This paper describes an improved algorithm for automated design of rotary-platen type of multi-shot molds for manufacturing multi-material objects. The algorithm described in this paper accounts for geometric constraints resulting from the rotary-platen process and it can handle significantly more complex interfaces. Our algorithm works in the following manner. First, we classify the multi-material object into several basic types based on the relationships among different single material components in the object. For every basic type, we find a manufacturing sequence based on the precedence constraints resulting due to accessibility and disassembly requirements. Then, starting from the last mold stage, we generate the mold pieces for every mold stage based on the manufacturing sequence. We expect that the algorithm described in this paper will provide the necessary foundations for automating the design of rotary-platen molds and therefore will help in significantly reducing the mold manufacturing lead-time associated with these types of molds.

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Chen, Yong, and David W. Rosen. "A Reverse Glue Approach to Automated Construction of Multi-Piece Molds." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/cie-48171.

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Mold design can be a difficult, time-consuming process. Determining how to split a mold cavity into multiple mold pieces (e.g., core, cavity) manually can be a tedious process. This paper focuses on the mold construction step of the automated mold design process. By investigating glue operations and its relations with parting faces, an approach based on reverse glue operation is presented. The key of the reverse glue operation is to generate parting faces. A problem definition of parting face generation for a region is provided. Correspondingly, three face generating criteria are identified. Based on the parting lines of a region, our algorithms to generate the parting faces are presented. Our mold construction algorithms for two-piece molds and multi-piece molds are also presented with brief discussions. Some industrial examples are provided which illustrate the efficiency and effectiveness of our approach. We tested our mold designs by fabricating stereolithography mold inserts (a rapid tooling method) and molding parts.

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Alsayyed, Basel, and Nicholas Foland. "Design and Implement an Additive Manufacturing Injection Mold." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-88593.

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Abstract In this project, we would like to explore the viability of using 3D printed injection molds to cost-effectively produce low-volume production runs. These 3D printed molds are much more cost-effective than traditional methods, however, the 3D printed molds often only withstand 50–100 cycles. Research is needed to determine how to improve the durability of the molds. This can be accomplished by measuring and documenting how injection molds made from various plastics, and various 3D printing technologies, react under the stresses of an injection molding machine. We can develop a case study using 4 different types of plastics that can be used to create the 3D printed mold. The 3 plastics would be Formlabs Ridged 10k Resin, Formlabs Clear v4, and Formlabs Tough 2000 Resin. These materials will be printed using various 3D printing technologies. This paper will focus on a literature review of the positives and negatives of 3D printing additively manufactured injection molding tooling and propose potential solutions for many of the negatives of 3D printed molds. The case study portion will be based on how we are planning to perform the case study, but it has not yet been completed.

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Pokkalla, Deepak Kumar, Ahmed Arabi Hassen, Jesse Heineman, et al. "Thermal Analysis and Design of Self-Heating Molds Using Large-Scale Additive Manufacturing for Out-of-Autoclave Applications." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95790.

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Abstract Autoclave processing is a commonly used state-of-the-art fiber-reinforced composite manufacturing technology, albeit with high capital cost, long cycle times and high energy consumption. Alternatively, out-of-autoclave processing reduces the initial and operating costs while producing composite structures with similar quality as that of autoclave parts. Additive Manufacturing (AM) the scaled-up molds for out-of-autoclave process using carbon fiber (CF) reinforced composite offers design flexibility, enhanced mechanical, and thermal properties in addition to reduction in weight and cost. However, heating of these molds using an oven is still expensive and necessitates an energy-efficient heating process. In this study, resistive heating through heating elements embedded within fiber reinforced composite molds is used as an efficient heating mechanism. The goal is to design wire embeddings and determine the optimal heat flux density to achieve a target uniform temperature of 80°C across the mold surface. To this end, numerical analyses were performed to evaluate the temperature distribution across the composite mold surface for a given wire placement and mold configuration. Constant thermal properties of the 20 wt.% short CF reinforced acrylonitrile butadiene styrene (ABS) were used in the thermal analysis. Time taken to reach the steady state temperature was also estimated. Design guidelines for wire embeddings were included to enable efficient manufacturing of fiber-reinforced composites through out-of-autoclave molds.

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Reports on the topic "Molds"

1

Havstad, M. A. Emittance of investment casting molds. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10180706.

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J. K. Parker, K. A. Woodbury, T. S. Piwonka, and Y. Owusu. Relationship Between Casting Distortion, Mold Filling, and Interfacial Heat Transfer in Sand Molds. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/12625.

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Post, Brian, Bradley Richardson, Peter Lloyd, Lonnie Love, Stephen Nolet, and James Hannan. Additive Manufacturing of Wind Turbine Molds. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1376487.

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David Schwam, John F. Wallace, Tom Engle, and Qingming Chang. Gating of Permanent Molds for Aluminum Casting. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/840927.

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David Schwam, John F. Wallace, Tom Engle, and Qingming Chang. Gating of Permanent Molds for ALuminum Casting. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/822451.

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Duty, Chad, and Robert Springfield. Evaluation of Additive Manufacturing for Composite Part Molds. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1221722.

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Kelly, James J. Micro-Replication: Precision Metal parts from Electronformed Master Molds. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/793726.

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Barlow, J. O., D. M. Stefanescu, A. M. Lane, W. C. Schreiber, M. Owens, and T. S. Piwonka. Metal Penetration in Sand Molds for Steel Castings: Annual Report. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/432796.

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Love, Lonnie J., and Peter D. Lloyd. Additive Manufacturing of Molds for Fabrication of Insulated Concrete Block. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1427609.

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Duty, Chad E., Vlastimil Kunc, Bradley S. Lokitz, and Robert M. Springfield. Evaluation of Additive Manufacturing for High Volume Composite Part Molds. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1360075.

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