Готові списки джерел за темами / Indirect additive manufacturing

Добірка наукової літератури з теми "Indirect additive manufacturing"

Автор: Grafiati
Опубліковано: 22 червня 2024

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  2. Дисертації
  3. Частини книг
  4. Тези доповідей конференцій
  5. Звіти організацій

Статті в журналах з теми "Indirect additive manufacturing":

1

He, Rujie, Niping Zhou, Keqiang Zhang, Xueqin Zhang, Lu Zhang, Wenqing Wang, and Daining Fang. "Progress and challenges towards additive manufacturing of SiC ceramic." Journal of Advanced Ceramics 10, no. 4 (July 18, 2021): 637–74. http://dx.doi.org/10.1007/s40145-021-0484-z.

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AbstractSilicon carbide (SiC) ceramic and related materials are widely used in various military and engineering fields. The emergence of additive manufacturing (AM) technologies provides a new approach for the fabrication of SiC ceramic products. This article systematically reviews the additive manufacturing technologies of SiC ceramic developed in recent years, including Indirect Additive Manufacturing (Indirect AM) and Direct Additive Manufacturing (Direct AM) technologies. This review also summarizes the key scientific and technological challenges for the additive manufacturing of SiC ceramic, and also forecasts its possible future opportunities. This paper aims to provide a helpful guidance for the additive manufacturing of SiC ceramic and other structural ceramics.
2

Khan, Shah Fenner, M. J. German, and K. W. Dalgarno. "Indirect Additive Manufacturing Processing of Poly-Lactide-co-Glycolide." Applied Mechanics and Materials 754-755 (April 2015): 985–89. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.985.

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The research and development of biomaterials have brought about new treatments in regenerative medicine. The research work presented in this paper focus on the use of Poly-Lactide-co-glycolide (PLGA) in the fabrication of patient specific fracture fixation plate by indirect additive manufacturing method. The use of biopolymers such as PLGA has been seen as a solution to the problems of stress shield and post-surgery inherent in biometal fixation plates. This paper discusses the consequence of this processing method on characteristics and properties of the PLGA. PLGA of ratio 50:50, 65:35 and 85:15 was processed and compared. The granules of PLGA were positioned in the cavity of the stereolithography (SLA) mould and heated under constant pressure with sintering temperature of 73°C for 2.0hours. Both the variation in samples fabricated from this process with the designed model and the changes in material characteristics are below 10%. The flexural strength for PLGA of ratio 50:50, 65:35 and 85:15 is 73.8±2.3MPa, 75.0±2.8, 60.0±11.7, respectively. The characteristics and mechanical tests indicate that the results were comparable with conventional processing of PLGA.
3

Aizat, M., and S. F. Khan. "Fabrication of mandible fracture plate by indirect additive manufacturing." Journal of Physics: Conference Series 908 (October 2017): 012063. http://dx.doi.org/10.1088/1742-6596/908/1/012063.

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4

Carreira, Pedro, Daniel Gatões, Nuno Alves, Ana Sofia Ramos, and Maria Teresa Vieira. "Searching New Solutions for NiTi Sensors through Indirect Additive Manufacturing." Materials 15, no. 14 (July 19, 2022): 5007. http://dx.doi.org/10.3390/ma15145007.

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Shape Memory Alloys (SMAs) can play an essential role in developing novel active sensors for self-healing, including aeronautical systems. However, the NiTi SMAs available in the market are almost limited to wires, small sheets, and coatings. This restriction is mainly due to the difficulty in processing NiTi through conventional processes. Thus, the objective of this study is to evaluate the potential of one of the most promising routes for NiTi additive manufacturing—material extrusion (MEX). Optimizing the different steps during processing is mandatory to avoid brittle secondary phases formation, such as Ni3Ti. The prime NiTi powder is prealloyed, but it also contains NiTi2 and Ni as secondary phases. The present study highlights the role of Ni and NiTi2, with the later having a melting temperature (Tm = 984 °C) lower than the NiTi sintering temperature, thus allowing a welcome liquid phase sintering (LPS). Nevertheless, the reaction of the liquid phase with the Ni phase could contribute to the formation of brittle intermetallic compounds, particularly around NiTi and NiTi2 phases, affecting the final structural properties of the 3D object. The addition of TiH2 to the virgin prealloyed NiTi powder was also studied and revealed the non-formation of Ni3Ti for a specific composition. The balancing addition of extra Ni revealed priority in the Ni3Ti appearance, emphasizing the role of Ni. Feedstocks extruded (filaments) and green strands (layers), before and after debinding & sintering, were used as homothetic of 3D objects for evaluation of defects (microtomography), microstructures, and mechanical properties. The composition of prealloyed powder with 5 wt.% TiH2 addition after sintering showed a homogeneous matrix with the NiTi2 second phase uniformly dispersed.
5

Shahzad, Khuram, Jan Deckers, Zhongying Zhang, Jean-Pierre Kruth, and Jef Vleugels. "Additive manufacturing of zirconia parts by indirect selective laser sintering." Journal of the European Ceramic Society 34, no. 1 (January 2014): 81–89. http://dx.doi.org/10.1016/j.jeurceramsoc.2013.07.023.

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6

Abdelaal, Osama, Saied Darwish, Khaled Abd Elmougoud, and Saleh Aldahash. "A new methodology for design and manufacturing of a customized silicone partial foot prosthesis using indirect additive manufacturing." International Journal of Artificial Organs 42, no. 11 (May 24, 2019): 645–57. http://dx.doi.org/10.1177/0391398819847682.

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The production of customized prostheses for the foot and ankle still relies on slow and laborious steps of the traditional plaster molding fabrication techniques. Additive manufacturing techniques where three-dimensional objects can be constructed directly based on the object’s computer-aided-design data in a layerwise manner has opened the door to new opportunities for manufacturing of novel and personalized medical devices. The purpose of the present study was to develop a new methodology for design and manufacturing of a customized silicone partial foot prosthesis via an indirect additive manufacturing process. Furthermore, the biomechanics of gait of a subject with partial foot amputation wearing the custom silicone foot prosthesis manufactured by the indirect additive manufacturing was characterized, in comparison with a matched healthy participant. This study has confirmed the possibility of producing silicone partial foot prosthesis by indirect additive manufacturing procedure. The amputated subject reported total comfort using the custom prosthesis during walking, as well as cosmetic advantages. The prosthesis restored the foot geometry and normalized many of gait characteristics. The findings presented here contribute to introduce a proper understanding of biomechanics of walking after wearing silicone partial foot prosthesis and are useful for prosthetists and rehabilitation therapists when treating patients after partial foot amputation.
7

Greeff, G. P. "Material Flow Rate Estimation in Material Extrusion Additive Manufacturing." NCSL International measure 13, no. 1 (2021): 46–56. http://dx.doi.org/10.51843/measure.13.1.5.

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The additive manufacturing of products promises exciting possibilities. Measurement methodologies, which measure an in-process dataset of these products and interpret the results, are essential. However, before developing such a level of quality assurance several in-process measurands must be realized. One of these is the material flow rate, or rate of adding material during the additive manufacturing process. Yet, measuring this rate directly in material extrusion additive manufacturing presents challenges. This work presents two indirect methods to estimate the volumetric flow rate at the liquefier exit in material extrusion, specifically in Fused Deposition Modeling or Fused Filament Fabrication. The methods are cost effective and may be applied in future sensor integration. The first method is an optical filament feed rate and width measurement and the second is based on the liquefier pressure. Both are used to indirectly estimate the volumetric flow rate. The work also includes a description of linking the G-code command to the final print result, which may be used to create a per extrusion command model of the part.
8

Snosi, Ahmed Mamdouh, Shaimaa Mohamed Lotfy, Yasmine Galaleldin Thabet, Marwa Ezzat Sabet, and Fardos Nabil Rizk. "Subtractive versus additive indirect manufacturing techniques of digitally designed partial dentures." Journal of Advanced Prosthodontics 13, no. 5 (2021): 327. http://dx.doi.org/10.4047/jap.2021.13.5.327.

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9

Montero, Joaquin, Pablo Vitale, Sebastian Weber, Matthias Bleckmann, and Kristin Paetzold. "Indirect Additive Manufacturing of resin components using polyvinyl alcohol sacrificial moulds." Procedia CIRP 91 (2020): 388–95. http://dx.doi.org/10.1016/j.procir.2020.02.191.

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10

Ramadany, Mohamed, and Mohamed Saad Bajjou. "Applicability and integration of concrete additive manufacturing in construction industry: A case study." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 235, no. 8 (January 30, 2021): 1338–48. http://dx.doi.org/10.1177/0954405420986102.

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The spread of additive manufacturing in recent years has broadened the sector of applications, namely in the construction field. This technology enables new functionalities and opportunities to be considered for the construction industry. Indeed, 3D printing processes can directly or indirectly affect the concrete material. Besides the printing processes for concrete structures, there are other indirect uses of 3D concrete printing, such as the manufacture of molds and formwork. However, its integration raises new challenges. This paper is first devoted to the state-of-the-art regarding the use of additive manufacturing in construction through a bibliographical study and an overview of various experiences in different countries. Secondly, the opportunities of such technologies for the construction sector will be discussed. Then, the issues and challenges related to the applicability and integration of concrete additive manufacturing will be highlighted. Finally, a diagnosis of the applicability and integration of concrete additive manufacturing has been made by analyzing the results of a survey of Moroccan professionals. The objective is to raise and identify key factors for successful integration.
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Статті в журналах

Дисертації з теми "Indirect additive manufacturing":

1

Mohamad, Khan Shah Fenner. "Novel indirect additive manufacturing for processing biomaterials." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/3022.

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The aim of this work was to identify methods for the production of patient-specific biomedical devices via indirect additive manufacturing (AM) methods. Additive manufacturing has been shown to provide a good solution for the manufacture of patient specific implants, but in a limited range of materials, and at a relatively high cost. This research project considered what are known as “indirect” AM approaches, which typically consider AM in combination with one or more subsequent processes in order to produce a part, with a maxillofacial plate and mandible resection used as a demonstrator application. Three different approaches were considered: (i) using AM to produce moulds for powder pressing of bioceramic green parts for subsequent sintering; (ii) using AM to produce moulds for biopolymer sintering; and (iii) 3D printing of bioceramic powders into green parts for subsequent sintering. Apatite wollastonite glass ceramic (AW) and poly-Lactide-co-glycolide (PLGA) were selected as the bioceramic and biopolymer materials to process. These were characterised before and after processing in order to ensure that the processing route did not affect the material properties. Geometric dimensions, the morphological structure and mechanical properties were studied to establish the accuracy, shrinkage and strength of the fabricated biomaterial implants. The use of AM processes to produce moulds for PLGA sintering, and the 3D printing of bioceramic powders formed the best overall results in terms of the definition and properties of the manufactured parts. Parts produced were accurate to within 5% of the as designed dimensions for both the PLGA sintering and the bioceramic powders 3D printing. The indirect AM methods are considered to be promising processing routes for medical devices.
2

Bernardo, Jesse Raymond. "Indirect Tissue Scaffold Fabrication via Additive Manufacturing and Biomimetic Mineralization." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/36312.

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Unlike traditional stochastic scaffold fabrication techniques, additive manufacturing (AM) can be used to create tissue-specific three-dimensional scaffolds with controlled porosity and pore geometry (meso-structure). However, due to the relatively few biocompatible materials available for processing in AM machines, direct fabrication of tissue scaffolds is limited. To alleviate material limitations and improve feature resolution, a new indirect scaffold fabrication method is developed. A four step fabrication process is explored: Fused Deposition Modeling (FDM) is used to fabricate scaffold patterns of varied pore size and geometry. Next, scaffold patterns are surface treated, and then mineralized via simulated body fluid (SBF); forming a bone-like ceramic throughout the scaffold pattern. Finally, mineralized patterns are heat treated to pyrolyze the pattern and sinter the minerals. Two scaffold meso-structures are tested: â tubeâ and â backfill.â Two pattern materials are tested [acrylonitrile butadiene styrene (ABS) and investment cast wax (ICW)] to determine which material is the most appropriate for mineralization and sintering. Mineralization is improved through plasma surface treatment and dynamic flow conditions. Appropriate burnout and sintering temperatures to remove pattern material are determined experimentally. While the â tube scaffoldsâ were found to fail structurally, â backfill scaffoldsâ were successfully created using the new fabrication process. The â backfill scaffoldâ meso-structure had wall thicknesses of 470 â 530 µm and internal channel diameters of 280 â 340 µm, which is in the range of appropriate pore size for bone tissue engineering. â Backfill scaffoldsâ alleviated material limitations, and had improved feature resolution compared to current indirect scaffold fabrication processes.
Master of Science
3

Grimaud, Pierre. "Élaboration de prothèses dentaires par fabrication additive indirecte combinant stéréolithographie et gel casting." Electronic Thesis or Diss., Valenciennes, Université Polytechnique Hauts-de-France, 2024. http://www.theses.fr/2024UPHF0004.

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Ce mémoire de thèse découle d’une recherche collaborative initiée en octobre 2020, dont le thème s’articule autour de l’élaboration de pièces céramiques techniques à géométrie complexe par des procédés innovants. Associant les compétences du CERAMATHS de Maubeuge-France et du BCRC de Mons-Belgique, cette thèse appliquée a été co-financée par l’agglomération de Maubeuge-Val-de-Sambre (CAMVS) et le BCRC et s’inscrit dans une démarche d’Éco-conception visant notamment la fabrication de couronnes dentaires en ZrO2. La stratégie établie consiste à associer des techniques additives aux procédés de gel-casting, par moulage de gels polymériques biosourcées minéralisables après traitement thermique conventionnel. Il s’agit de lever des problèmes récurrents propres aux opérations d’usinage de pièces à géométrie complexe (production de déchets, apparition de microfissures …). De nombreux essais et mesures expérimentales sont présentées, ainsi que des calculs de modélisations moléculaires, afin de comprendre les mécanismes chimiques mis en jeu au cours des étapes de transformation et de corréler mesures physico-chimiques et calculs prévisionnels.Le mémoire de thèse s’articule donc en quatre chapitres principaux :Le chapitre II présente les prothèses dentaires d’une manière générale et une description des diverses techniques de fabrication issues de la littérature. Se focalisant principalement sur la confection de pièces céramiques, ce chapitre bibliographique permet de comparer et de classer les procédés entre eux, en précisant les techniques de mise forme additive directe et indirecte, soustractive et formative. Un focus sur le procédé de gel casting permet d’aborder les avantages potentiels d’une voie exploitant un gel chargé en poudres céramiques. En justifiant la démarche expérimentale retenue, cette bibliographie permettra de confronter les difficultés actuelles de mise en œuvre de pièces céramiques complexes avec les exigences du domaine dentaire.Nous verrons dans le chapitre III que l’Agarose est utilisable en tant que matrice polymérique sacrificielle apte à disperser des poudres céramiques avant traitement thermique et densification. Ce chapitre est ainsi consacré à la caractérisation des matières premières, puis à la confection de pièces céramiques combinant une méthode additive (conception de moules) et une méthode Gel Casting exploitant l’Agarose. D’une part, l’agarose en solution y est présentée d’un point de vue préparatoire, comportemental et physico-chimique. D’autre part, la fabrication des moules par stéréolithographie est également décrite. Le chapitre IV précise les stratégies et les travaux entrepris pour modifier les propriétés générales de l’agarose. Divers succinates d’agarose ont été synthétisés et caractérisés expérimentalement dans ce sens. Des résultats sont présentés pour qualifier le comportement rhéologique, avec des interprétations confortées par des calculs de modélisation macromoléculaire. Le chapitre V concerne la mise en œuvre d’une gélification chimiquement activée afin d’exploiter les propriétés de l’alginate de sodium plutôt que celles de l’agarose. Dans ce chapitre, deux voies différentes sont étudiées sur la base de variations stœchiométriques du milieu réactionnel initial, ainsi que des résultats prometteurs de mise en forme.La conclusion générale précise un bilan qualitatif et des perspectives sur notre procédé qui associe des moules obtenus par stéréolithographie et une matrice visqueuse à base de polymères naturels tels que l’agarose et l’alginate de sodium
This thesis results from collaborative research initiated in October 2020, the theme of which revolves around the development of technical ceramic pieces with complex geometry using innovative processes. Combining the skills of CERAMATHS of Maubeuge-France and the BCRC of Mons-Belgium, this applied thesis was co-financed by the agglomeration of Maubeuge-Val-de-Sambre (CAMVS) and the BCRC and is part of an approach of Eco-design aimed in particular at the manufacture of dental crowns in ZrO2. The established strategy consists of combining additive techniques with gel-casting processes, by molding biosourced polymer gels that can be mineralized after conventional heat treatment. This involves addressing recurring problems specific to machining operations on parts with complex geometry (production of waste, appearance of microcracks, etc.). Numerous tests and experimental measurements are presented, as well as molecular modeling calculations, in order to understand the chemical mechanisms involved during the transformation stages and correlate physicochemical measurements and forecast calculations. The thesis is therefore divided into four main chapters: Chapter II presents dental prostheses in general and a description of the various manufacturing techniques taken from the literature. Focusing mainly on the making of ceramic pieces, this bibliographical chapter allows us to compare and classify the processes between them, specifying the techniques of direct and indirect additive, subtractive and formative shaping. A focus on the gel casting process allows us to address the potential advantages of a route using a gel loaded with ceramic powders. By justifying the experimental approach adopted, this bibliography will make it possible to confront the current difficulties of implementing complex ceramic parts with the requirements of the dental field. We will see in the chapter III that Agarose can be used as a sacrificial polymer matrix capable of dispersing ceramic powders before heat treatment and densification. This chapter is thus devoted to the characterization of raw materials, then to the manufacture of ceramic parts combining an additive method (mold design) and a Gel Casting method using Agarose. On the one hand, agarose in solution is presented from a preparatory, behavioral and physicochemical point of view. Furthermore, the manufacturing of molds by stereolithography is also described. Chapter IV specifies the strategies and work undertaken to modify the general properties of agarose. Various agarose succinates have been synthesized and experimentally characterized in this direction. Results are presented to qualify the rheological behavior, with interpretations supported by macromolecular modeling calculations. Chapter V concerns the implementation work of chemically activated gelation in order to exploit the properties of sodium alginate rather than those of agarose. In this chapter, two different pathways are studied based on stoichiometric variations of the initial reaction medium, as well as promising shaping results. The general conclusion specifies a qualitative assessment and perspectives on our process which combines molds obtained by stereolithography and a viscous matrix based on natural polymers such as agarose and sodium alginate
4

Duarte, Valdemar Rebelo. "Developments in Directed Energy Deposition Additive Manufacturing: In-situ Hot Forging and Indirect Cooling." Doctoral thesis, 2022. http://hdl.handle.net/10362/134198.

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Additive Manufacturing (AM) by Directed Energy Deposition-arc (DED-arc) is competing with other AM technologies due to its high deposition rate, ability to produce large parts with medium/high geometric complexity and low capital and running costs. However, residual stresses, coarse microstructures, and defects on parts, such as cracks and pores, may compromise in-service industrial applications and need to be overcome. This work aimed to develop and validate two innovative process variants: one based on in-situ hot forging; and the other on temperature control, that is, indirect cooling of deposited material and hot forging. The hot forging variant consisted of locally forging the deposited layer at high temperatures using low forces. The goal is to create an uniform plastic deformation zone along the layer, to promote grain refinement, reduce material anisotropy and collapse defects. The variant based on temperature control consisted of cooling the hammer components and the shielding gas used to protect the molten pool, to increase the solidification rate and thus, prevent grain coalescence. For this, dedicated DED-arc equipment was designed and manufactured with specific features for research. The effect of hot forging was analysed in detail on 316LSi stainless steel, and the feasibility of its application was verified in other relevant industrial materials. It was concluded that hot forging can induce dynamic recrystallization, increase nucleation sites and prevent epitaxial grain growth. Thus, it contributes to an overall refined and homogeneous microstructure with improved mechanical properties. The developed cooling system lowered the average temperature of the nozzle and hammer during consecutive depositions. Cooling of the shielding gas had no major effect on the cooling rates and microstructure of the materials, however, it was observed that the hot forging changes the heat flow conditions of the part, promoting higher cooling rates.
A tecnologia de deposição direta de energia por arco (DED-arc) tem competido com outras tecnologias de fabrico aditivo devido à sua elevada taxa de deposição, capacidade de produzir componentes de grandes dimensões com média/alta complexidade geométrica e baixos custos de implementação e funcionamento. Contudo, as elevadas tensões residuais, as microestruturas grosseiras, ou os defeitos do tipo poros, podem comprometer algumas aplicações industriais e necessitam de ser superados. Este trabalho visou desenvolver e validar duas variantes inovadoras de processo DED- arc: uma baseada no forjamento a quente; e outra no controlo de temperatura. A variante baseada no forjamento, consistiu em forjar o material depositado imediatamente após a deposição, utilizando baixas forças. O objetivo foi a produção de uma zona de deformação plástica uniforme ao longo de cada camada, para promover alterações microestruturais, nomeadamente o refinamento dos grãos e a redução da anisotropia. A variante baseada no trabalho termodinâmico consistiu em arrefecer os componentes do martelo e o gás utilizado para proteger o banho de fusão, com o objetivo de aumentar a taxa de arrefecimento e assim evitar a coalescência dos grãos. Neste sentido, foi concebido e fabricado um equipamento de DED-arc, com características específicas para investigação. O efeito do forjamento a quente foi estudado detalhadamente no aço inoxidável 316LSi, e foi verificada a viabilidade da sua aplicação noutros materiais relevantes industrialmente. Concluiu-se que o forjamento induz recristalização dinâmica, aumenta os pontos de nucleação e impede o crescimento de grãos epitaxiais, contribuindo para uma microestrutura globalmente mais fina, homogénea e com melhores propriedades mecânicas. O sistema de arrefecimento desenvolvido baixou a temperatura do bocal e do martelo durante as deposições consecutivas. O arrefecimento do gás de proteção não teve efeito nas taxas de arrefecimento nem na microestrutura do material, contudo, observou-se que o forjamento altera as condições de fluxo de calor, promovendo taxas de arrefecimento maiores.

Частини книг з теми "Indirect additive manufacturing":

1

Singh, Gurminder, Pawan Sharma, Kedarnath Rane, and Sunpreet Singh. "Indirect Rapid Tooling Methods in Additive Manufacturing." In Additive and Subtractive Manufacturing Processes, 163–84. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003327394-9.

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2

Weiss, F., E. Garrelts, D. Roth, H. Binz, M. Brunetti, and T. Karcher. "Konstruktionsrestriktionen für das Indirect Tooling mit FDM und Feinguss." In Rapid.Tech + FabCon 3.D – International Trade Show + Conference for Additive Manufacturing, 111–27. München: Carl Hanser Verlag GmbH & Co. KG, 2018. http://dx.doi.org/10.3139/9783446458123.007.

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3

Weiss, F., E. Garrelts, D. Roth, H. Binz, M. Brunetti, and T. Karcher. "Konstruktionsrestriktionen für das Indirect Tooling mit FDM und Feinguss." In Rapid.Tech + FabCon 3.D – International Trade Show & Conference for Additive Manufacturing, 111–27. München, Germany: Carl Hanser Verlag GmbH & Co. KG, 2018. http://dx.doi.org/10.1007/978-3-446-45812-3_7.

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4

Chaudhuri, Atanu, Elham Sharifi, Saeed Davoudabadi Farahani, Lasse Guldborg Staal, and Brian Vejrum Waehrens. "The Journey from Direct and Indirect Additive Manufacturing of Individual Parts to Virtual Warehousing of the Parts Portfolio: Lessons for Industrial Manufacturers." In The Future of Smart Production for SMEs, 239–51. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15428-7_20.

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5

Haar, Christoph, Hangbeom Kim, and Lukas Koberg. "AI-Based Engineering and Production Drawing Information Extraction." In Lecture Notes in Mechanical Engineering, 374–82. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18326-3_36.

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AbstractThe production of small batches to single parts has been increasing for many years and it burdens manufacturers with higher cost pressure. A significant proportion of the costs and processing time arise from indirect efforts such as understanding the manufacturing features of engineering drawings and the process planning based on the features. For this reason, the goal is to automate these indirect efforts. The basis for the process planning is information defined in the design department. The state of the art for information transfer between design and work preparation is the use of digital models enriched with additional information (e.g. STEP AP242). Until today, however, the use of 2D manufacturing drawings is widespread. In addition, a lot of knowledge is stored in old, already manufactured components that are only documented in 2D drawings. This paper provides an AI(Artificial Intelligence)-based methodology for extracting information from the 2D engineering and manufacturing drawings. Hereby, it combines and compiles object detection and text recognition methods to interpret the document systematically. Recognition rates for 2D drawings up to 70% are realized.
6

Singh, Sunpreet, Chander Prakash, and M. Uthayakumar. "Recent Advancements in Customized Investment Castings Through Additive Manufacturing." In Additive Manufacturing, 296–319. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9624-0.ch012.

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Conventional investment casting (IC) has suffered from numerous limitations such as rigidity of the process, longer production cycles, higher tooling cost, and waste during different manufacturing stages. With the invent of additive manufacturing (AM) technologies, it is now possible to overcome the aforesaid issues along with additional benefits in terms of comparatively better quality characteristics of the resulting castings. The collaboration of AM and IC provided numerous avenues, specifically in biomedical, aerospace, and automobile sectors. AM technologies supported the IC process both in direct and indirect ways where these systems can be used for both job and mass production applications, respectively. In the chapter, the author will try to discuss the assistance of AM process to IC in detail. Each and every step to be followed will be supported with the practical findings, either by the contributing author or published somewhere else. Moreover, some of the case studies will be discussed in detail to highlight the practical importance of the duo.
7

Gonzalez-Gutierrez, Joamin. "Indirect Additive Manufacturing Techniques for Metal Parts: Binder-Based Additive Manufacturing Techniques." In Encyclopedia of Materials: Metals and Allloys, 319–29. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-819726-4.00100-9.

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8

Singh, Sunpreet, Chander Prakash, and M. Uthayakumar. "Recent Advancements in Customized Investment Castings Through Additive Manufacturing." In Handbook of Research on Green Engineering Techniques for Modern Manufacturing, 24–48. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5445-5.ch003.

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Conventional investment casting (IC) has suffered from numerous limitations such as rigidity of the process, longer production cycles, higher tooling cost, and waste during different manufacturing stages. With the invent of additive manufacturing (AM) technologies, it is now possible to overcome the aforesaid issues along with additional benefits in terms of comparatively better quality characteristics of the resulting castings. The collaboration of AM and IC provided numerous avenues, specifically in biomedical, aerospace, and automobile sectors. AM technologies supported the IC process both in direct and indirect ways where these systems can be used for both job and mass production applications, respectively. In the chapter, the author will try to discuss the assistance of AM process to IC in detail. Each and every step to be followed will be supported with the practical findings, either by the contributing author or published somewhere else. Moreover, some of the case studies will be discussed in detail to highlight the practical importance of the duo.
9

Bibb, Richard, Dominic Eggbeer, Abby Paterson, and Mazher Iqbal Mohammed. "Prosthetic rehabilitation applications case study 6—Evaluation of direct and indirect additive manufacture of maxillofacial prostheses using additive manufacturing." In Medical Modeling, 357–75. Elsevier, 2024. http://dx.doi.org/10.1016/b978-0-323-95733-5.00022-3.

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10

Xiao, Xianfeng, Cong Lu, Yanshu Fu, Xiaojun Ye, and Lijun Song. "Progress on Experimental Study of Melt Pool Flow Dynamics in Laser Material Processing." In Liquid Metals [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97205.

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Laser material processing has becoming a rapid developing technology due to the flexibility of laser tool. Melt pool is the main product from the interaction between laser and material and its features has a great impact on the heat transfer, solidification behavior, and defects formation. Thus, understanding changes to melt pool flow is essential to obtain good fabricated product. This chapter presents a review of the experimental studies on melt pool flow dynamics for laser welding and laser additive manufacturing. The mechanisms of melt pool convection and its principal affecting factors are first presented. Researches on melt flow visualization using direct and indirect experimental methods are then reviewed and discussed.

Тези доповідей конференцій з теми "Indirect additive manufacturing":

1

Tan, Yu En, and Seung Ki Moon. "Indirect 3D Printing of an Inflatable Wing for Small UAVS Reinforced with 3D Hexagonal Diamond Structures." In 1st International Conference on Progress in Additive Manufacturing. Singapore: Research Publishing Services, 2014. http://dx.doi.org/10.3850/978-981-09-0446-3_119.

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2

Mun, Jiwon, Jaehyung Ju, and James Thurman. "Indirect Additive Manufacturing Based Casting (I AM Casting) of a Lattice Structure." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38055.

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Direct-metal additive manufacturing (AM) processes such as Selective Laser Melting (SLM) and Electron Beam Melting (EBM) methods are being used to fabricate complex metallic cellular structures with a laser or electron beam over a metal powder bed. Even though these processes have excellent capabilities to fabricate parts with cellular mesostructures, there exist several constraints in the processes and applications: limited selection of materials, high thermal stress by the high local energy source, poor surface finish, and anisotropic properties of parts caused by combined effects of one-dimensional (1D) energy based patterning mechanism, the deposition layer thickness, powder size, power and travel speed of laser or electron beam. In addition, manufacturing cost is still high with the Direct-metal AM processes. As an alternative for manufacturing metallic 3D cellular structures, which can overcome the disadvantages of direct-metal AM techniques, polymer AM methods may be combined with metal casting. We may call this “Indirect AM based Casting (I AM casting)”. The objective of this study is to explore the potential of I AM Casting associated with development of a novel manufacturing process — Indirect 3D Printing based centrifugal casting which is capable of producing multifunctional metallic cellular structures with internal cooling channels having a 2mm inner diameter and 0.5mm wall thickness. We characterize polymers by making expendable patterns with a polyjet type 3D printer; e.g., modulus, strength, melting and glass transition temperatures and thermal expansion coefficients. A transient flow and heat-transfer analysis of molten metal through 3D cellular network mold will be conducted. Solidification of molten metal through cellular mold during casting will be simulated with temperature dependent properties of molten metal and mold over a range of running temperatures. The volume of fluid (VOF) method will be implemented to simulate the solidification of molten metal together with a user defined function (UDF) of ANSYS/FLUENT. Finally, experimental validation will be conducted.
3

Oliveira, Gonçalo, Bernardo Alves, Ricardo Mineiro, Ana Maria Rocha Senos, Cristina Fernandes, Daniel Figueiredo, and Maria Teresa Vieira. "Indirect Additive Manufacturing (Material Extrusion) as a Solution to a New Concept of Cutting Tools." In World Powder Metallurgy 2022 Congress & Exhibition. EPMA, 2022. http://dx.doi.org/10.59499/wp225366866.

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A cermet grade with TiCN as major phase and 15wt.% Co/Ni as the binder and secondary carbides WC, Mo2C and NbC was selected for indirect additive manufacturing (Material Extrusion). These powder constituents were the primary material of feedstocks to produce filaments for the indirect AM process - Material Extrusion (MEX). The filaments result from the extrusion of a feedstock previously optimized (CPVC= critical powder volume concentration) and selection of polymeric binder and additive. Concerning the cermet powder particles, 4Ss (particle size, particle size distribution, particle shape, and particle structure) and the quality of the organic binder/additives through the feedstock and filament behaviour were evaluated, in what concerns "printability" and sinterability. Cermet 3D-objects were successfully printed by MEX and sintered. No significant deformation was measured after debinding and sintering, and no undesired phases were detected in the microstructures of the 3D-object.
4

Mun, Jiwon, Matthew Busse, Jaehyung Ju, and James Thurman. "Multilevel Metal Flow-Fill Analysis of Centrifugal Casting for Indirect Additive Manufacturing of Lattice Structures." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52270.

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The centrifugal casting is a classical manufacturing method and it has been widely studied. However, when it comes to manufacture thin walled lattice materials with complex three-dimensional meso-structures, a multiscale flow-fill analysis may be needed for macro-filling at the sprue system and micro-filling at lattice structures. On the micro-filing analysis for a thin walled lattice structure, the surface tension of molten metal appears to be an important factor. On the other hand, flow inertia may affect the flow-filling process more than the surface tension of molten metal does. Our hypothesis is that there exist a range of ratios of cell wall thickness to length that are primarily affected by surface tension or density. From comparison with two different molten metals — aluminum and copper alloys, we can estimate the characteristic of flow, which will be of benefit when designing lattice structures and selecting materials for the manufacturing process. The objective of this study is to test the hypothesis by constructing an analytical model on flow filling of molten metals (aluminum alloy and copper alloy) associated with manufacturing lattice structures. The Naiver-Stokes equation with surface tension is considered for modeling of the flow of molten metal along the micro-channel of lattice structures and is numerically implemented with MATLAB. Temperature dependent properties of the liquid metals; e.g., density, viscosity, and conductivity, are considered for building the analytical model. Numerical simulations with a commercial code, ANSYS are conducted using a user defined function. Experimental validation is followed to manufacture a cubic truss lattice structure with a varying wall thickness; 0.5–1mm. Two molten metals — aluminum alloy and copper alloy are used for filling the mold at the centrifugal casting system. The mold is prepared by removing sacrificial lattice patterns made by a polyjet 3D printer. The preliminary result shows that the final lattice structures with an aluminum alloy through the 3D printing of sacrificial pattern followed by centrifugal casting have relatively good flow filling property at thin wall thickness (∼0.5mm) due to low surface tension of aluminum alloy. On the other hand, the high surface tension of a copper alloy prevents flow-fill to micro-channel mold cavity, resulting in early solidification. The indirect additive manufacturing based casting shows an excellent surface quality, which can be used for manufacturing cellular structures. A coupled flow and heat transfer of molten metal successfully simulate flow-fill and solidification and is compared with the experiment. Faster filling-time and faster solidification for the temperature-dependent material properties were shown.
5

Cacho, Luís, Bernardo Alves, Amílcar Ramalho, Augusta Neto, Teresa Vieira, and Gonçalo Rodrigues. "Micromechanical Modeling of the Material Impact in the Feedstock Filament Properties for Indirect Additive Manufacturing (MEX)." In Materiais 2022. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/materproc2022008038.

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6

Gatões, Daniel, Luis Cacho та M. T. Vieira. "μCT Non-destructive Testing Of Additively Manufactured 3Dobjects As Support For True Sustainability". У Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235764060.

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Additive Manufacturing is an essential process for novel geometries. However, complex parts demand a new perspective in defects control and support for the modelling of mechanical behaviour to assess the applicability of the 3D object to the conditions of the application. Therefore, non-destructive testing is essential for the evaluation of the role of stochastic defects (size, shape, and homogeneous distribution) on the mechanical properties of AM 3D objects. In this study, a wide evaluation of μCT (micro-computed tomography) for two metallic additive manufacturing processes – material extrusion (indirect) and selective laser melting (direct) – is performed. The results are analysed concerning physical properties changes that occur in additive manufacturing per defect origin type. Comparison of mechanical properties with the results of modelling, having in mind the defect characteristics, led to conclude that μCT is a powerful tool for AM parameter optimisation and the improvement of process sustainability.
7

Heo, Hyeonu, Addis Tessema, Shaheer Iqbal, Jaehyung Ju, and Addis Kidane. "Thermal Stress Analysis of Gypsum Shell Cracking in Polyjet-Based Rapid Casting of Cellular Metals." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52417.

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Cellular (or lattice) metals are increasingly gaining attention for their having combinations of mechanical, thermal, and acoustic properties that provide potential opportunities for diverse multifunctional structural implementations. These include ultra-light structures with high specific strength and high specific strain, excellent impact absorption, acoustic insulation, heat dissipation media and compact heat exchangers. The emerging 3D printing technologies including direct and indirect additive manufacturing processes may accelerate the realization of their structural applications of cellular metals. For indirect additive manufacturing processes, sacrificial patterns are 3D printed with castable polymers, followed by metal filling into a mold cavity to make final cellular metals. With a high stiffness of a castable polymer, e.g., VisiJet® Procast, it is possible to build network lattice cellular structures, replacing wax which has been used for traditional investment casting processes. In general, a high thermal stress is expected during burning-out process of the rapid casing. Due to the castable polymer’s new properties, no literature is available on thermal stress between the castable polymer and ceramic shells for indirect additive manufacturing of cellular structures. The objective of this study is to investigate i) thermal stress by thermal expansion mismatch between a sacrificial pattern made of a castable polymer and a coated gypsum shell and ii) an effect of the thickness of the coated gypsum shell on thermal cracking. Starting with thermal analysis, glass transition temperature, melting temperature and thermal expansion coefficient are obtained from experiments. An analytical model for thermal stress analysis is constructed with thermo-mechanical constitutive equations and compatibility equations, followed by a failure analysis at the coated shells where gypsum is used for coating the sacrificial pattern. The thermo-mechanical analysis is conducted as a function of temperature and coated shell thickness followed by a numerical validation with a finite element (FE) based simulation. The castable polymer has the potential to be used as a base material for manufacturing 3D network cellular sacrificial patterns with thin cell walls over conventional wax materials due to its high modulus and low thermal expansion coefficient during the burning out process of the sacrificial pattern.
8

Yamada, J., H. Ibe, K. Sato, and N. Kato. "Functional WC Cemented Carbide by the Direct Selective Laser Forming." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0725.

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Abstract Metal and polymer additive manufacturing is advancing on several applications. On the other hand, materials cermet such as WC/Co for functional structure molding by additive manufacturing are under studying. There are few reports for WC cemented carbide additive manufacturing process by forming with polymer binder then sintering. This indirect process has difficulties to make high precision functional parts due to shape control during additional sintering process. Direct forming is desired for high precision parts. However, factors and/or mechanism to achieve direct formed functional structure have been unclear in many aspects. In this study, the process conditions of the direct selective laser melting were investigated to achieve dense and hard WC cemented carbide mold parts. The optimization of laser melting conditions for WC/Co agglomerated and sintered powder was examined. In order to forming a dense and high hardness parts, the optimum conditions between powder preparation and laser energy density which related with laser power, scan speed and spot diameter were appeared by this experiments. Moldings more than 1500HV are achieved at low laser energy density. However, some of pores were observed in moldings. In addition, the dense molding could be obtained by high laser energy density. This means optimum dense functional WC cemented carbide molding is available by optimization of the molding condition. It is applicable for growing industries like automotive, aviation and cutting tool.
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Alves, B., D. Gatões, P. Soares, L. Rodrigues, and M. T. Vieira. "Material Extrusion: Shaping And Sintering Optimization Through µ-Tomography." In Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235765455.

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Indirect additive manufacturing techniques like Material Extrusion (MEX) are rising in industrial application due to the freedom of design usually attributed to additive processing, as well as accessibility and a real contribution to sustainability. This study highlights the role of µ-tomography as a core of non-destructive techniques to optimize shaping and sintering parameters. Moreover, brings forth the possibility of continuous improvement and quality control without disposable specimens. Therefore, this study aims to optimize the manufacture of metallic specimens (AISI 316L), for similar feedstock (binder/additive), by using µ-tomography to analyse the filament, the strand, and the 3Dobject (green and sintered). Optimization the different MEX steps relies on setting key process variables and understanding their impact on defects using µ-tomography. This methodology allows the evaluation of 3Dobjects quality by non-destructive techniques.
10

Oliveira, Gonçalo, Ricardo Mineiro, Ana Maria Rocha Senos, Cristina Fernandes, Daniel Figueiredo, and Teresa Vieira Maria. "WC-Co Versus Ticn/WC–Co, Ni For New Cutting Tools." In Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235765296.

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Advanced cutting tools are required for the new challenge of the machining industry to make more sustainable solutions. Material extrusion (MEX), as an indirect additive manufacturing technology, could be used to process hardmetals (WC-Co) and, also, the designated cermets (TiCN/WC and Co, Ni). While versatile for different feedstock possibilities, it is capable to produce complex internal structures that could lead to more efficient cooling solutions. However, it is not yet easy to replicate the main MEX parameters developed for organic or metallic materials when the feedstocks are based on hardmetal and cermet powder. The main objective of this study is to add a better understanding of these materials processed by MEX, considering that the defects, from shaping to debinding and sintering, have a significant role in the performance of the tool.

Звіти організацій з теми "Indirect additive manufacturing":

1

Post, Brian, Celeste Atkins, Amiee Jackson, Phillip Chesser, Alex Roschli, Abby Barnes, Andrzej Nycz, et al. A Comparative Study of Direct and Indirect Additive Manufacturing Approaches for the Production of a Wind Energy Component. Office of Scientific and Technical Information (OSTI), June 2021. http://dx.doi.org/10.2172/1809969.

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