Letteratura scientifica selezionata sul tema "Fabrication additive hybride"
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Articoli di riviste sul tema "Fabrication additive hybride":
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Berger, Uwe. "1808 A Survey on Hybrid Fabrication Processes by Integration of Additive and Subtractive Manufacturing". Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2015.8 (2015): _1808–1_—_1808–6_. http://dx.doi.org/10.1299/jsmelem.2015.8._1808-1_.
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Gutierrez, Cassie, Rudy Salas, Gustavo Hernandez, Dan Muse, Richard Olivas, Eric MacDonald, Michael D. Irwin et al. "CubeSat Fabrication through Additive Manufacturing and Micro-Dispensing". International Symposium on Microelectronics 2011, n. 1 (1 gennaio 2011): 001021–27. http://dx.doi.org/10.4071/isom-2011-tha4-paper3.
Abstract (sommario):
Fabricating entire systems with both electrical and mechanical content through on-demand 3D printing is the future for high value manufacturing. In this new paradigm, conformal and complex shapes with a diversity of materials in spatial gradients can be built layer-by-layer using hybrid Additive Manufacturing (AM). A design can be conceived in Computer Aided Design (CAD) and printed on-demand. This new integrated approach enables the fabrication of sophisticated electronics in mechanical structures by avoiding the restrictions of traditional fabrication techniques, which result in stiff, two dimensional printed circuit boards (PCB) fabricated using many disparate and wasteful processes. The integration of Additive Manufacturing (AM) combined with Direct Print (DP) micro-dispensing and robotic pick-and-place for component placement can 1) provide the capability to print-on-demand fabrication, 2) enable the use of micron-resolution cavities for press fitting electronic components and 3) integrate conductive traces for electrical interconnect between components. The fabrication freedom introduced by AM techniques such as stereolithography (SL), ultrasonic consolidation (UC), and fused deposition modeling (FDM) have only recently been explored in the context of electronics integration and 3D packaging. This paper describes a process that provides a novel approach for the fabrication of stiff conformal structures with integrated electronics and describes a prototype demonstration: a volumetrically-efficient sensor and microcontroller subsystem scheduled to launch in a CubeSat designed with the CubeFlow methodology.
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Kumar, Sanjay, Pulak Bhushan, Mohit Pandey e Shantanu Bhattacharya. "Additive manufacturing as an emerging technology for fabrication of microelectromechanical systems (MEMS)". Journal of Micromanufacturing 2, n. 2 (17 giugno 2019): 175–97. http://dx.doi.org/10.1177/2516598419843688.
Abstract (sommario):
The recent success of additive manufacturing processes (also called, 3D printing) in the manufacturing sector has led to a shift in the focus from simple prototyping to real production-grade technology. The enhanced capabilities of 3D printing processes to build intricate geometric shapes with high precision and resolution have led to their increased use in fabrication of microelectromechanical systems (MEMS). The 3D printing technology has offered tremendous flexibility to users for fabricating custom-built components. Over the past few decades, different types of 3D printing technologies have been developed. This article provides a comprehensive review of the recent developments and significant achievements in most widely used 3D printing technologies for MEMS fabrication, their working methodology, advantages, limitations, and potential applications. Furthermore, some of the emerging hybrid 3D printing technologies are discussed, and the current challenges associated with the 3D printing processes are addressed. Finally, future directions for process improvements in 3D printing techniques are presented.
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Li, Yan, Dichen Li, Bingheng Lu, Dajing Gao e Jack Zhou. "Current status of additive manufacturing for tissue engineering scaffold". Rapid Prototyping Journal 21, n. 6 (19 ottobre 2015): 747–62. http://dx.doi.org/10.1108/rpj-03-2014-0029.
Abstract (sommario):
Purpose – The purpose of this paper is to review the current status of additive manufacturing (AM) used for tissue engineering (TE) scaffold. AM processes are identified as an effective method for fabricating geometrically complex objects directly from computer models or three-dimensional digital representations. The use of AM technologies in the field of TE has grown rapidly in the past 10 years. Design/methodology/approach – The processes, materials, precision, applications of different AM technologies and their modified versions used for TE scaffold are presented. Additionally, future directions of AM used for TE scaffold are also discussed. Findings – There are two principal routes for the fabrication of scaffolds by AM: direct and indirect routes. According to the working principle, the AM technologies used for TE scaffold can be generally classified into: laser-based; nozzle-based; and hybrid. Although a number of materials and fabrication techniques have been developed, each AM technique is a process based on the unique property of the raw materials applied. The fabrication of TE scaffolds faces a variety of challenges, such as expanding the range of materials, improving precision and adapting to complex scaffold structures. Originality/value – This review presents the latest research regarding AM used for TE scaffold. The information available in this paper helps researchers, scholars and graduate students to get a quick overview on the recent research of AM used for TE scaffold and identify new research directions for AM in TE.
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He, Liu, Peiren Wang, Lizhe Wang, Min Chen, Haiyun Liu e Ji Li. "Multifunctional Polymer-Metal Lattice Composites via Hybrid Additive Manufacturing Technology". Micromachines 14, n. 12 (30 novembre 2023): 2191. http://dx.doi.org/10.3390/mi14122191.
Abstract (sommario):
With increasing interest in the rapid development of lattice structures, hybrid additive manufacturing (HAM) technology has become a competent alternative to traditional solutions such as water jet cutting and investment casting. Herein, a HAM technology that combines vat photopolymerization (VPP) and electroless/electroplating processes is developed for the fabrication of multifunctional polymer-metal lattice composites. A VPP 3D printing process is used to deliver complex lattice frameworks, and afterward, electroless plating is employed to deposit a thin layer of nickel-phosphorus (Ni-P) conductive seed layer. With the subsequent electroplating process, the thickness of the copper layer can reach 40 μm within 1 h and the resistivity is around 1.9×10−8 Ω⋅m, which is quite close to pure copper (1.7 ×10−8 Ω⋅m). The thick metal shell can largely enhance the mechanical performance of lattice structures, including structural strength, ductility, and stiffness, and meanwhile provide current supply capability for electrical applications. With this technology, the frame arms of unmanned aerial vehicles (UAV) are developed to demonstrate the application potential of this HAM technology for fabricating multifunctional polymer-metal lattice composites.
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Ley, Jazmin, Cristian Pantea, John Greenhall e Joseph A. Turner. "Resonant ultrasound spectroscopy of hybrid metal additive manufacturing". Journal of the Acoustical Society of America 154, n. 4_supplement (1 ottobre 2023): A150. http://dx.doi.org/10.1121/10.0023085.
Abstract (sommario):
Additive manufacturing has been targeted as the next high-impact fabrication technique for parts and components. Hybrid metal additive manufacturing (AM) refers to the 3-D printed fabrication process involving secondary manufacturing processes or energy sources and multifunctional printing. Specific layers are altered within the build using additional processes (i.e., milling or peening) that are synergistic with the additive process. This combination alters the sample microstructure and can refine grains, increase dislocation density, or induce residual stresses. The effect of these hybrid layers is typically not confined within the layer alone but has a compounding effect on preceding layers. The goal is to control the changes in print parameters throughout the build to enhance component performance, but unique challenges remain for nondestructive validation of such samples. Traditional ultrasonic methods on hybrid-AM components have successfully mapped material variations with sufficient spatial resolution. However, the use of resonance ultrasound spectroscopy (RUS) for hybrid-AM is less developed. In this presentation, the use of RUS is described relative to the characterization of hybrid AM 316L stainless steel samples. The spatial organization of the hybrid samples affects the resonances relative to their mode shape. Computational models are used to quantify the impact of the hybrid processes.
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Zhong, Fanchao, Haisen Zhao, Haochen Li, Xin Yan, Jikai Liu, Baoquan Chen e Lin Lu. "VASCO: Volume and Surface Co-Decomposition for Hybrid Manufacturing". ACM Transactions on Graphics 42, n. 6 (5 dicembre 2023): 1–17. http://dx.doi.org/10.1145/3618324.
Abstract (sommario):
Additive and subtractive hybrid manufacturing (ASHM) involves the alternating use of additive and subtractive manufacturing techniques, which provides unique advantages for fabricating complex geometries with otherwise inaccessible surfaces. However, a significant challenge lies in ensuring tool accessibility during both fabrication procedures, as the object shape may change dramatically, and different parts of the shape are interdependent. In this study, we propose a computational framework to optimize the planning of additive and subtractive sequences while ensuring tool accessibility. Our goal is to minimize the switching between additive and subtractive processes to achieve efficient fabrication while maintaining product quality. We approach the problem by formulating it as a Volume-And-Surface-CO-decomposition (VASCO) problem. First, we slice volumes into slabs and build a dynamic-directed graph to encode manufacturing constraints, with each node representing a slab and direction reflecting operation order. We introduce a novel geometry property called hybrid-fabricability for a pair of additive and subtractive procedures. Then, we propose a beam-guided top-down block decomposition algorithm to solve the VASCO problem. We apply our solution to a 5-axis hybrid manufacturing platform and evaluate various 3D shapes. Finally, we assess the performance of our approach through both physical and simulated manufacturing evaluations.
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Berktas, Ilayda, Ali Nejad Ghafar, Patrick Fontana, Ayten Caputcu, Yusuf Menceloglu e Burcu Saner Okan. "Facile Synthesis of Graphene from Waste Tire/Silica Hybrid Additives and Optimization Study for the Fabrication of Thermally Enhanced Cement Grouts". Molecules 25, n. 4 (17 febbraio 2020): 886. http://dx.doi.org/10.3390/molecules25040886.
Abstract (sommario):
This work evaluates the effects of newly designed graphene/silica hybrid additives on the properties of cementitious grout. In the hybrid structure, graphene nanoplatelet (GNP) obtained from waste tire was used to improve the thermal conductivity and reduce the cost and environmental impacts by using recyclable sources. Additionally, functionalized silica nanoparticles were utilized to enhance the dispersion and solubility of carbon material and thus the hydrolyzable groups of silane coupling agent were attached to the silica surface. Then, the hybridization of GNP and functionalized silica was conducted to make proper bridges and develop hybrid structures by tailoring carbon/silica ratios. Afterwards, special grout formulations were studied by incorporating these hybrid additives at different loadings. As the amount of hybrid additive incorporated into grout suspension increased from 3 to 5 wt%, water uptake increased from 660 to 725 g resulting in the reduction of thermal conductivity by 20.6%. On the other hand, as the concentration of GNP in hybrid structure increased, water demand was reduced, and thus the enhancement in thermal conductivity was improved by approximately 29% at the same loading ratios of hybrids in the prepared grout mixes. Therefore, these developed hybrid additives showed noticeable potential as a thermal enhancement material in cement-based grouts.
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Hinton, Jack, Dejan Basu, Maria Mirgkizoudi, David Flynn, Russell Harris e Robert Kay. "Hybrid additive manufacturing of precision engineered ceramic components". Rapid Prototyping Journal 25, n. 6 (8 luglio 2019): 1061–68. http://dx.doi.org/10.1108/rpj-01-2019-0025.
Abstract (sommario):
Purpose The purpose of this paper is to develop a hybrid additive/subtractive manufacturing platform for the production of high density ceramic components. Design/methodology/approach Fabrication of near-net shape components is achieved using 96 per cent Al3O2 ceramic paste extrusion and a planarizing machining operations. Sacrificial polymer support can be used to aid the creation of overhanging or internal features. Post-processing using a variety of machining operations improves tolerances and fidelity between the component and CAD model while reducing defects. Findings This resultant three-dimensional monolithic ceramic components demonstrated post sintering tolerances of ±100 µm, surface roughness’s of ∼1 µm Ra, densities in excess of 99.7 per cent and three-point bending strength of 221 MPa. Originality/value This method represents a novel approach for the digital fabrication of ceramic components, which provides improved manufacturing tolerances, part quality and capability over existing additive manufacturing approaches.
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Krokoszinski, H. ‐J, H. Oetzmann, H. Gernoth e C. Schmidt. "Additive thin film technology for hybrid circuit fabrication". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 3, n. 6 (novembre 1985): 2704–7. http://dx.doi.org/10.1116/1.572821.
Tesi sul tema "Fabrication additive hybride":
1
Parent, Alex, e Alex Parent. "Développement d'un système de fabrication additive hybride par mise en fusion d'un filament d'aluminium grâce au chauffage par induction". Master's thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37159.
Abstract (sommario):
Les machines de fabrication additive métallique actuelles sont dispendieuses et généralement peu productives. De plus, la plupart des pièces issues de la fabrication additive doivent être usinées après l’impression pour obtenir de bonnes tolérances géométriques. L’objectif de ce projet de recherche est de développer un système de fabrication additive hybride pouvant remplacer les machines d’usinage traditionnelles. Les systèmes hybrides combinent les avantages de la fabrication additive et de l’usinage dans un seul système. Ce mémoire présente le développement et la mise en service d’un système de fabrication additive hybride formant des pièces en aluminium à partir d’un filament d’Al4043. Ce système utilise une technologie innovatrice qui se base sur le principe de chauffage par induction. Le filament est fondu directement par induction à l’intérieur d’un tube, puis un flux d’argon permet à l’aluminium en fusion de s’éjecter du tube. Cette méthode permet de faire des préformes en aluminium qui peuvent être usinées afin d’obtenir une pièce finale. Cette technologie permettrait de fabriquer une machine hybride à faible coût tout en ayant un taux de déposition élevé. Le système a été installé sur un bras robotisé FANUC. Les résultats préliminaires démontrent qu’il est possible de générer des gouttelettes d’aluminium de manière contrôlée en pulsant le débit d’argon grâce à une valve. Les gouttelettes sont générées à chaque pulse puis sont projetées sur un substrat en suivant une trajectoire précise. L’accumulation des gouttelettes formera une couche d’aluminium, puis les couches seront empilées pour former une pièce. Des pièces en aluminium ont été mises en forme grâce à ce nouveau procédé de fabrication additive. Le volume des pièces pouvant être imprimées est limité par la perte d’efficacité du système de chauffage par induction après plusieurs minutes d’utilisation. La densité apparente la plus élevée obtenue avec ce système est de 84%.Les machines de fabrication additive métallique actuelles sont dispendieuses et généralement peu productives. De plus, la plupart des pièces issues de la fabrication additive doivent être usinées après l’impression pour obtenir de bonnes tolérances géométriques. L’objectif de ce projet de recherche est de développer un système de fabrication additive hybride pouvant remplacer les machines d’usinage traditionnelles. Les systèmes hybrides combinent les avantages de la fabrication additive et de l’usinage dans un seul système. Ce mémoire présente le développement et la mise en service d’un système de fabrication additive hybride formant des pièces en aluminium à partir d’un filament d’Al4043. Ce système utilise une technologie innovatrice qui se base sur le principe de chauffage par induction. Le filament est fondu directement par induction à l’intérieur d’un tube, puis un flux d’argon permet à l’aluminium en fusion de s’éjecter du tube. Cette méthode permet de faire des préformes en aluminium qui peuvent être usinées afin d’obtenir une pièce finale. Cette technologie permettrait de fabriquer une machine hybride à faible coût tout en ayant un taux de déposition élevé. Le système a été installé sur un bras robotisé FANUC. Les résultats préliminaires démontrent qu’il est possible de générer des gouttelettes d’aluminium de manière contrôlée en pulsant le débit d’argon grâce à une valve. Les gouttelettes sont générées à chaque pulse puis sont projetées sur un substrat en suivant une trajectoire précise. L’accumulation des gouttelettes formera une couche d’aluminium, puis les couches seront empilées pour former une pièce. Des pièces en aluminium ont été mises en forme grâce à ce nouveau procédé de fabrication additive. Le volume des pièces pouvant être imprimées est limité par la perte d’efficacité du système de chauffage par induction après plusieurs minutes d’utilisation. La densité apparente la plus élevée obtenue avec ce système est de 84%.
Current metal additive manufacturing machines are expensive and generally unproductive. In addition, the majority of parts from additive manufacturing must be machined after printing to achieve good geometric tolerances. The objective of this research project is to develop a hybrid additive manufacturing system that can replace traditional machining machines. Hybrid systems combine the benefits of additive manufacturing and machining into a single system. This thesis presents the development and usage of a hybrid additive manufacturing system that can form aluminum parts from a Al4043 filament. The system presented in this thesis uses an innovative technology that is based on the principle of induction heating. The filament is melted directly by induction inside a tube, then a flow of argon allows the molten aluminum to eject from the tube. This method makes aluminum preforms that can be machined to obtain a final piece. With this technology, it could be possible to manufacture a hybrid machine at low cost while having a high deposition rate. The system was installed on a FANUC robotic arm. Preliminary results demonstrate that it is possible to generate aluminum droplets in a controlled manner by pulsing the argon flow through a valve. The droplets are generated at each pulse and are projected onto a substrate along a precise trajectory. The accumulation of droplets will form a layer of aluminum, then the layers will be stacked to form a part. Aluminum parts have been shaped by this new additive manufacturing process. The volume of parts that can be printed is limited by the loss of efficiency of the induction heating system after several minutes of use. The highest bulk density obtained with this system is 84%.
Current metal additive manufacturing machines are expensive and generally unproductive. In addition, the majority of parts from additive manufacturing must be machined after printing to achieve good geometric tolerances. The objective of this research project is to develop a hybrid additive manufacturing system that can replace traditional machining machines. Hybrid systems combine the benefits of additive manufacturing and machining into a single system. This thesis presents the development and usage of a hybrid additive manufacturing system that can form aluminum parts from a Al4043 filament. The system presented in this thesis uses an innovative technology that is based on the principle of induction heating. The filament is melted directly by induction inside a tube, then a flow of argon allows the molten aluminum to eject from the tube. This method makes aluminum preforms that can be machined to obtain a final piece. With this technology, it could be possible to manufacture a hybrid machine at low cost while having a high deposition rate. The system was installed on a FANUC robotic arm. Preliminary results demonstrate that it is possible to generate aluminum droplets in a controlled manner by pulsing the argon flow through a valve. The droplets are generated at each pulse and are projected onto a substrate along a precise trajectory. The accumulation of droplets will form a layer of aluminum, then the layers will be stacked to form a part. Aluminum parts have been shaped by this new additive manufacturing process. The volume of parts that can be printed is limited by the loss of efficiency of the induction heating system after several minutes of use. The highest bulk density obtained with this system is 84%.
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Jacques, Marjorie. "Développement d'une méthode de conception de moules et noyaux hybrides en fonderie". Thesis, Reims, 2019. http://www.theses.fr/2019REIMS021.
Abstract (sommario):
Ces travaux de recherche ont pour objectif de définir une méthodologie de conception de moules hybrides en fonderie. Cette méthodologie est définie à partir des limites technico-économiques des procédés traditionnels de moulage et de l’impression 3D sable. Dans un premier temps, ces limites sont évaluées par la caractérisation mécanique et dimensionnelle des moules imprimés. Cette caractérisation mécanique a été réalisée à partir d’essais de flexion 3 points et de compression en fonction de différents paramètres. La capabilité dimensionnelle de l’imprimante 3D a été évaluée par la mesure d’éprouvettes imprimées dans différentes directions. Dans un second temps, la méthode de conception des moules traditionnels a été formalisée à partir du recueil de l’expertise des partenaires fondeurs du projet ANR MONARCHIES et testée sur différents cas. Les règles métiers inhérentes à l’imprimante 3D sable ont été établies à partir des travaux du laboratoire ITHEMM et complétées par l’étude de pièces. Le processus de conception des moules imprimés a été élaboré à partir de ces règles métiers et validé sur des études de cas. Le coût de fabrication des moules imprimés a été défini par une méthode analytique et paramétrique. La méthodologie de conception des moules hybrides s’appuie sur l’ensemble des travaux précédents et sur la notion d’indice de complexité. En fonction de la valeur de ces indices de complexité, des contraintes de remmoulage et de coût de fabrication, le choix optimal du procédé de fabrication est défini pour les différentes parties du moule. Enfin, cette méthodologie a été testée sur un panel représentatif de pièces de fonderie permettant d’évaluer sa robustesseThe aim of this works is to define a design methodology of hybrids casting molds. This methodology is based on technical and economical limits of conventional process and 3D sand printing. Firstly, these limits were evaluated by mechanical and dimensional characterization of 3D sand printing molds. Mechanical characterization was realised by three points bending test and compression testing with different parameters. 3D printer dimensional capability was determined by samples measure printed in different directions. Secondly, the design method of conventional molds was established from smelters know-how which are ANR MONARCHIES project partner from different case study. Inherent design rules of sand 3D printer were defined from the ITHEMM laboratory research works and completed with parts studies. 3D printing molds design process was created by design rules and validated with studies cases. Manufacturing cost of printing molds was defined by analytic and parametric method. The hybrids molds design methodology relies on all previous works and on complexity index. Optimal manufacturing process for different molds parts was selected according to the complexity index value, mould assembly restraint and manufacturability cost. Finally, this methodology was tested on representative sample group of casting parts, allowed to evaluate the robustness
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Ushakov, Ilia. "Établissement des structures et propriétés mécaniques de l’alliage d’Inconel 625 dans les procédés d’élaboration additive à grande vitesse : arc fil, laser fil, laser poudre et hybride". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0147.
Abstract (sommario):
Ce travail porte sur l'étude de l'établissement des structures et la caractérisation des propriétés mécaniques d'alliage d'Inconel 625 produites dans le cadre du projet PAM-PROD visant à réaliser des pièces de grande dimension par élaboration additive à grande vitesse. Trois techniques de dépôt sont étudiées : Arc/Fil, Laser/Fil et Laser/Poudre ainsi que la combinaison Laser/Fil et Laser/Poudre pour réalisation d'un mur hybride. Pour chaque procédés les macrostructures et microstructures sont caractérisées. Les procédés Arc/Fil et Laser/Poudre utilisés conduisent à une macrostructure mixte colonnaire équiaxe. Le procédé Laser/Fil conduit à des structures majoritairement colonnaires. Des mécanismes de formation des structures et transitions colonnaires/équiaxes sont proposés. Ces mécanismes sont alors repris et complétés pour interpréter la formation de la zone de transition dans le cas d'un mur hybride Laser Fil/Poudre. La réponse au traitement thermique de mise en solution et vieillissement est ensuite présentée en détaillant et comparant les cinétiques et mécanismes propres à chaque procédé. Les propriétés mécaniques en traction suivant 3 directions sont alors caractérisées et reliées aux structures. Pour l'ensemble des procédés une grande reproductibilité est obtenue et aucun procédé ne présente de caractère fragile. Les meilleures propriétés sont obtenues avec le procédé Laser/Poudre et le test de la jonction hybride montre que la zone de transition ne présente pas un point faible dans la structureThis work focuses on the establishment of microstructures and the characterization of the mechanical properties of Inconel 625 alloy produced as part of the PAM-PROD project aimed at producing large parts using high deposition rate additive manufacturing. Three deposition techniques are being studied: Arc/Wire, Laser/Wire and Laser/Powder, as well as a combination of Laser/Wire and Laser/Powder to produce a hybrid wall. Macrostructures and microstructures are characterized for each process. The Arc/Wire and Laser/Powder processes used lead to a mixed columnar - equiaxed macrostructure. The Laser/Wire process leads to predominantly columnar structures. Mechanisms for the formation of columnar/equiaxed structures and transitions are proposed. These mechanisms are then taken up and completed to interpret the formation of the transition zone in the case of a hybrid Laser Wire/Powder wall. The response to solution heat treatment and ageing is then presented by detailing and comparing the kinetics and mechanisms specific to each process. The tensile mechanical properties along 3 directions are then characterized and related to the structures. For all the processes, a high degree of reproducibility is obtained and none of the processes has a brittle character. The best properties were obtained with the Laser/Powder process, and the hybrid junction test showed that the transition zone was not a weak point in the structure
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Laplanche, Etienne. "Filtres à forts facteurs de qualité accordables continument". Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0064/document.
Abstract (sommario):
De nouveaux besoins dans le domaine des télécommunications par satellite ont amené les industriels du secteur à se pencher sur l’optimisation des ressources en créant des systèmes reconfigurables, capables d’adapter leur fonctionnement fréquentiel en cours de mission. Cette thèse s’intéresse plus particulièrement aux multiplexeurs et à la manière de les rendre agiles à travers les filtres qui les composent ainsi qu’une adaptation de leur architecture.Dans un premier temps, le présent manuscrit dresse l’état de l’art des dispositifs accordables réalisés par les équipes de recherche du monde entier, avant de proposer des solutions mettant en œuvre une topologie de multiplexage à coupleurs hybrides. Dans un second temps, des études sont présentées portant sur une pluralité de concepts de cavités ou d’éléments de couplage accordables. Certains de ces concepts sont ensuite sélectionnés et assemblés afin de former des fonctions de filtrage et de multiplexage accordables. La dernière partie présente ainsi deux multiplexeurs accordables, l’un permettant une reconfiguration en bande étroite, l’autre en bande large, le premier ayant donné lieu à une réalisation expérimentaleNew needs in the field of satellite telecommunications have led manufacturers in the sector to focus on optimizing resources by creating reconfigurable systems able to adapt their operating frequencyplan during the mission. This thesis focuses on multiplexers and how to make them agile through their architecture and the filters that compose them.This manuscript starts by realizing the state of the art oftunable filtering devices through analysis of contributions made by research teams around the world. Based on this state of art,solutions to the problematic are proposed using a hybrid coupler multiplexing topology. Then studies are presented on various tunable cavities or coupling elements concepts. Some of these concepts have been selected and assembled to form tunable filtering and multiplexing functions. The last part thus presents two tunable multiplexers, allowing narrowband or broadband reconfiguration. An experimental realization has also been conducted on the narrowband version
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Booysen, G., M. Truscott, D. Mosimanyane e Beer D. De. "Combining additive fabrication and conventional machining technologies to develop a hybrid tooling approach". Interim : Interdisciplinary Journal, Vol 8, Issue 2: Central University of Technology Free State Bloemfontein, 2009. http://hdl.handle.net/11462/367.
Abstract (sommario):
Published ArticleSouth Africa is constantly loosing contracts for the manufacturing of innovative projects to the East, due to its non-competitive mould-making industry. The paper will report on progress made in a specific focus area in mould-making, namely Hybrid Moulds for injection moulding. Hybrid Moulds refers to a hybrid between Additive Fabrication and conventional methods through the use of amongst others, Direct Metal Laser Sintering techniques, combined with conventional CNC machining (High Speed) techniques. Although the emphasis is on an economically viable process for limited production runs, once the moulds have been developed, it normally is pushed to its limits to realize production quantities. One of the competitive edges is the cutting of lead-times, which obviously impacts on production costs. Another aspect is the ability to manufacture short runs of injection moulded parts in the required engineering material Realising that Laser Sintering of metals is an expensive manufacturing process, a concurrent manufacturing process was developed. Intricate mould details, which normally are time-consuming to manufacture through EDM processes, were grown as inserts, while the less-complex parts of the mould is machined in Aluminium through 3 and 5 Axis High Speed CNC Machining. Using a 3-axis CNC wire cutter, pockets will be created where the more complex Laser Sintered Metal inserts will be fitted. One of the competitive edges is the cutting of lead-times, which obviously impacts on production costs. Another aspect is the ability to manufacture short runs of injection moulded parts in the required engineering material.
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Liu, Fengyuan. "Design, fabrication and evaluation of a hybrid biomanufacturing system for tissue engineering". Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/design-fabrication-and-evaluation-of-a-hybrid-biomanufacturing-system-for-tissue-engineering(13717125-61ac-4f95-a83b-62a706a5ea15).html.
Abstract (sommario):
The combined use of additive manufacturing (AM), biocompatible and biodegradable materials, cells and biomolecular signals is the most common biomanufacturing strategy applied in scaffold fabrication. AM processes offer a better control and the ability to actively design the porosity and interconnectivity of the scaffolds. When combined with clinical imaging data, these fabrication techniques can be used to produce constructs that are customised to the shape of the defect or injury. However, due to the hydrophobicity of the commonly used synthetic biopolymers, cell-seeding and proliferation efficiency are limited. Moreover, due to the tortuosity of the scaffolds, non-uniform cell distribution with rare cell adhesion in the core region also commonly exists. Additionally, the commercial available machines are not able to create multi-material and material gradient scaffolds that are required to mimic the nature of nature tissues. To overcome the above limitations, this thesis describes the development of a hybrid bio-additive manufacturing system, called plasma-assisted bioextruson system (PABS), to produce smart scaffold by combining multi-head polymer extrusion and the plasma surface modification layer by layer, in the same chamber. PABS allows not only multiple biomaterials printing with the multi-extrusion heads, but also enables in-process plasma surface modification for zonal plasma-treated scaffolds fabrication. The in-house user interface enables a high degree of scaffold design freedom as it allows users to create single or multi-material constructs with uniform pore size or pore size gradient by changing process parameters such as lay-down pattern, filament distance, feed rate and layer thickness. Water contact angle tests and in vitro biological tests confirm that the hydrophilicity of synthetic polymers is improved and cell attachment and proliferation are enhanced after the in-process plasma modification. The effect of plasma treatment is also investigated by using different plasma modification strategies and various plasma modification parameters, including the plasma deposition velocity and the distance between the plasma jet and the printed scaffolds. The biological results also show dependence between the surface modification strategies and cell proliferation. The mechanical compression results show that for a fixed plasma deposition velocity, the effect of changing the distance between the plasma head and the deposited material is not significant. However, for a fixed distance, the compressive modulus increases with the increase in the plasma deposition velocity.
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Tseng, Po-Kai, e 曾柏凱. "Hybrid Additive and Subtractive 3D Printing Process for Multi-Heterogeneous Objects Fabrication". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/h74s55.
Abstract (sommario):
碩士國立臺灣大學
電機工程學研究所
105
In recent years, three dimensional (3D) printing is the fastest growing technology. Nowadays, it has been largely applied in aerospace industry, industry and medicine engineering, etc. Additive manufacturing (AM) technologies not only reduce the new product development cycle, but also develop unique style models to satisfy users’ requirements. However, the additive manufacturing cannot complete the diversity and complexity products independently. We design the hybrid 3D printing machine including the additive and subtractive processes to complete the products. And the products may be composed of the many parts or objects. In the common slicing software, the 3D printers print an object layer by layer. However, when multiple objects are printed at the same time, the nozzle moves among objects and always increases enormous distance of the transition travel. Therefore, in this thesis, we propose a novel addition process optimization algorithm and develop the trajectory planning of the subtractive process to carve the customized logo or image. In the beginning, the optimization of the addition process is divided into three main steps. 1. The optimization for locating each specific object is implemented to minimize the supports during the printing procedure. This step can efficiently save the materials and consume less time for remove the supports. 2. Two dimensional packing problem for planning location of multiple objects is combined with the traveling salesman problem to promote the spray efficiency of nozzle. 3. With consideration of the workspace and hardware limitation, the printing time is apparently decreased by addition path optimization. Compared with the common path planning strategy, the advantage of the proposed path planning minimizes the frequency of movement among each object. This proposed algorithm effectively decreases time consuming on printing and saves energy consuming furthermore. For subtractive process, the object information can be obtained from additive process and is transformed to subtractive coordinate system. The sculpture region of the 3D object is initially expanded into 2D space by conform mapping, and the vertices of the flattening plane are adjusted to appropriate positions using spring mass model with edge-based flattening algorithm to minimize distortion of flattening plane. Then the 2D image can be intuitively projected onto the expanded plane by geometrical transformation. The projected product in 2D space can be reversely transformed into 3D space, where the reconstructed surface is fitted onto the original surface of the object. Therefore, the subtractive part can run along the path that is generated by above steps. We have demonstrated the success of the proposed methods by using the development of hybrid 3D printing machine consisting of additive and subtractive processes in our NTU robotics and automation lab.
Capitoli di libri sul tema "Fabrication additive hybride":
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Peterson, Eric, e Bhavleen Kaur. "Printing Compound-Curved Sandwich Structures with Robotic Multi-Bias Additive Manufacturing". In Computational Design and Robotic Fabrication, 526–36. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8405-3_44.
Abstract (sommario):
AbstractA research team at Florida International University Robotics and Digital Fabrication Lab has developed a novel method for 3d-printing curved open grid core sandwich structures using a thermoplastic extruder mounted on a robotic arm. This print-on-print additive manufacturing (AM) method relies on the 3d modeling software Rhinoceros and its parametric software plugin Grasshopper with Kuka-Parametric Robotic Control (Kuka-PRC) to convert NURBS surfaces into multi-bias additive manufacturing (MBAM) toolpaths. While several high-profile projects including the University of Stuttgart ICD/ITKE Research Pavilions 2014–15 and 2016–17, ETH-Digital Building Technologies project Levis Ergon Chair 2018, and 3D printed chair using Robotic Hybrid Manufacturing at Institute of Advanced Architecture of Catalonia (IAAC) 2019, have previously demonstrated the feasibility of 3d printing with either MBAM or sandwich structures, this method for printing Compound-Curved Sandwich Structures with Robotic MBAM combines these methods offering the possibility to significantly reduce the weight of spanning or cantilevered surfaces by incorporating the structural logic of open grid-core sandwiches with MBAM toolpath printing. Often built with fiber reinforced plastics (FRP), sandwich structures are a common solution for thin wall construction of compound curved surfaces that require a high strength-to-weight ratio with applications including aerospace, wind energy, marine, automotive, transportation infrastructure, architecture, furniture, and sports equipment manufacturing. Typical practices for producing sandwich structures are labor intensive, involving a multi-stage process including (1) the design and fabrication of a mould, (2) the application of a surface substrate such as FRP, (3) the manual application of a light-weight grid-core material, and (4) application of a second surface substrate to complete the sandwich. There are several shortcomings to this moulded manufacturing method that affect both the formal outcome and the manufacturing process: moulds are often costly and labor intensive to build, formal geometric freedom is limited by the minimum draft angles required for successful removal from the mould, and customization and refinement of product lines can be limited by the need for moulds. While the most common material for this construction method is FRP, our proof-of-concept experiments relied on low-cost thermoplastic using a specially configured pellet extruder. While the method proved feasible for small representative examples there remain significant challenges to the successful deployment of this manufacturing method at larger scales that can only be addressed with additional research. The digital workflow includes the following steps: (1) Create a 3D digital model of the base surface in Rhino, (2) Generate toolpaths for laminar printing in Grasshopper by converting surfaces into lists of oriented points, (3) Generate the structural grid-core using the same process, (4) Orient the robot to align in the direction of the substructure geometric planes, (5) Print the grid core using MBAM toolpaths, (6) Repeat step 1 and 2 for printing the outer surface with appropriate adjustments to the extruder orientation. During the design and printing process, we encountered several challenges including selecting geometry suitable for testing, extruder orientation, calibration of the hot end and extrusion/movement speeds, and deviation between the computer model and the physical object on the build platen. Physical models varied from their digital counterparts by several millimeters due to material deformation in the extrusion and cooling process. Real-time deviation verification studies will likely improve the workflow in future studies.
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Özdemir, E., L. Kiesewetter, K. Antorveza, T. Cheng, S. Leder, D. Wood e A. Menges. "Towards Self-shaping Metamaterial Shells:". In Proceedings of the 2021 DigitalFUTURES, 275–85. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_26.
Abstract (sommario):
AbstractDouble curvature enables elegant and material-efficient shell structures, but their construction typically relies on heavy machining, manual labor, and the additional use of material wasted as one-off formwork. Using a material’s intrinsic properties for self-shaping is an energy and resource-efficient solution to this problem. This research presents a fabrication approach for self-shaping double-curved shell structures combining the hygroscopic shape-changing and scalability of wood actuators with the tunability of 3D-printed metamaterial patterning. Using hybrid robotic fabrication, components are additively manufactured flat and self-shape to a pre-programmed configuration through drying. A computational design workflow including a lattice and shell-based finite element model was developed for the design of the metamaterial pattern, actuator layout, and shape prediction. The workflow was tested through physical prototypes at centimeter and meter scales. The results show an architectural scale proof of concept for self-shaping double-curved shell structures as a resource-efficient physical form generation method.
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Salary, Roozbeh, Jack P. Lombardi, Darshana L. Weerawarne, Prahalada K. Rao e Mark D. Poliks. "Toward Defect-Free Additive Fabricating of Flexible and Hybrid Electronics: Physics-Based Computational Modeling and Control of Aerosol Jet Printing". In Advances in Intelligent Systems and Computing, 351–61. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20216-3_33.
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Chu, Yushi, Liling Dong, Yanhua Luo, Jianzhong Zhang e Gang-Ding Peng. "Additive Manufacturing of Optical Waveguides". In Hybrid Planar - 3D Waveguiding Technologies [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105349.
Abstract (sommario):
Optical waveguides play an important role in both scientific research and industrial applications. Additive manufacturing (AM) or three-dimensional (3D)-printing technology has great potential to revolutionize manufacturing of optical waveguides. AM offers a great opportunity in developing optical waveguides demanding new material compositions and structure designs for functionalities needed in fast-evolving modern applications such as Internet of things (IoT). These demands have become so diverse and sophisticated that the traditional waveguide manufacturing cannot meet. In this chapter, we briefly introduce optical fibers one of the most common typical optical waveguides and present the process and perspective of optical fiber fabrication by AM technology.
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Hashem Abdelmohsen, Ahmed, Sherif A. El-Khodary e Nahla Ismail. "Theories, Hypothesis and Rules for Morphology Transition Engineering of 1D, 2D and 3D Nanomaterials". In Nanotechnology and Nanomaterials. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.112135.
Abstract (sommario):
Most of the chemical and physical properties of nanomaterials vary remarkably according to their size, shape, and structure. Thus morphology is a crucial parameter that controls the properties and functionality of materials. On the basis of Abdelmohsen et al.’s theories and hypothesis, which are theory for morphology transition engineering (ATMTE), theory for morphology engineering of solid compounds (ATMESC), and hypothesis for engineering of micro- and nanostructures (AHEMNS), novel approach was modified for fabricating one-, two-, and three-dimensional hybrid nanomaterials, such as hybrid ZnO nanosheets (38–150 nm), hybrid ZnO nanorods, hybrid nanocomposites, and hierarchical hybrid Cu2O nanostructures. In addition, by the help of this novel method, the fabrication of metal-oxidene (one/few atoms thick layer of metal oxides) is assumed and hybrid ZnO thin film that is expected to have extraordinary physicochemical properties. A series of selection rules and morphology engineering rules are discussed. Throughout this chapter, we will come across this novel approach as a promising technique for nanofabrication and discuss the suggested mechanisms for the evolution process during fabrication of nanomaterials. By the help of this method, we have fabricated 1D, 2D and 3D nanomaterials that are expected to have potential use for energy, catalysis, biomedical, and other applications.
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Senthilkumar, V., Velmurugan C., K. R. Balasubramanian e M. Kumaran. "Additive Manufacturing of Multi-Material and Composite Parts". In Advances in Civil and Industrial Engineering, 127–46. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-4054-1.ch007.
Abstract (sommario):
Additive manufacturing (AM) technology can be employed to produce multimaterial parts. In this approach, multiple types of materials are used for the fabrication of a single part. Custom-built functionally graded, heterogeneous, or porous structures and composite materials can be fabricated thorough this process. In this method, metals, plastics, and ceramics have been used with suitable AM methods to obtain multi-material products depending on functional requirements. The process of making composite materials by AM can either be performed during the material deposition process or by a hybrid process in which the combination of different materials can be performed before or after AM as a previous or subsequent stage of production of a component. Composite processes can be employed to produce functionally graded materials (FGM).
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Equbal, Azhar, Md Asif Equbal, Md Israr Equbal e Anoop Kumar Sood. "Multi-Criterion Decision Method for Roughness Optimization of Fused Deposition Modelled Parts". In Additive Manufacturing Technologies From an Optimization Perspective, 235–62. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-9167-2.ch012.
Abstract (sommario):
Fused deposition modelling is an extrusion-based automated fabrication process for making 3D physical objects from part digital information. The process offers distinct advantages, but the quality of part lacks in surface finish when compared with other liquid or powder based additive manufacturing processes. Considering the important factors affecting the part quality, the chapter attempted to optimize the raster angle, air gap, and raster width to minimize overall part roughness. Experiments are designed using face-centered central composite design and analysis of variance provides the effects of processing parameters on roughness of part. Suitability of developed model is tested using Anderson-darling normality test. Desirability method propose that roughness of different part faces are affected differently with chosen parameters, and thus, hybrid approach of WPCA based TOPSIS is used to break the correlation between part faces and reduce the overall part roughness. Optimizing shows that lower raster angle, lower air gap, and larger raster width minimizes overall part roughness.
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Joseph, Jithin. "Direct Laser Fabrication of Compositionally Complex Materials". In Advances in Civil and Industrial Engineering, 147–63. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-4054-1.ch008.
Abstract (sommario):
Additive manufacturing (AM) opens up the possibility of a direct build-up of components with sophisticated internal features or overhangs that are difficult to manufacture by a single conventional method. As a cost-efficient, tool-free, and digital approach to manufacturing components with complex geometries, AM of metals offers many critical benefits to various sectors such as aerospace, medical, automotive, and energy compared to conventional manufacturing processes. Direct laser fabrication (DLF) uses pre-alloyed powder mix or in-situ alloying of the elemental powders for metal additive manufacturing with excellent chemical homogeneity. It, therefore, shows great promise to enable the production of complex engineering components. This technique allows the highest build rates of the AM techniques with no restrictions on deposit size/shape and the fabrication of graded and hybrid materials by simultaneously feeding different filler materials. The advantages and disadvantages of DLF on the fabrication of compositionally complex metallic alloys are discussed in the chapter.
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Hallan, S. S. "Biomedical Applications of Zinc Oxide Nano-Carriers: An Ingenious Tool". In ZnO and Their Hybrid Nano-Structures, 234–62. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902394-8.
Abstract (sommario):
The zinc oxide-based nanoparticles have become the center of interest among the research community, especially in the field of biomedical sciences. They have unique inherent features which help with reduction in biofilm development, anti-bacterial/microbial potential, in addition to transporting active drug molecules to the target site. Further, the concept of green synthesis can also be applied in their fabrication. The effectiveness of these nanomaterials can be improved by transferring them into a gel system. This book chapter focuses on the recent advancements, technical challenges related to surface chemistry, shape and in designing these nanomaterials.
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Asghar, Hamza, Sara Baig, Mahnoor Naeem, Shamim Aslam, Aneeqa Bashir, Saadia Mumtaz, Muhammad Ikram et al. "Graphene Based Functional Hybrids: Design and Technological Applications". In Graphene - Recent Advances, Future Perspective and Applied Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108791.
Abstract (sommario):
Because of the versatile chemical, physical, and electrical properties, graphene as well as its nanocomposites are regarded as the backbone of engineering and scientific innovation. Different physical and chemical methods are used to create sustainable carbon materials. Furthermore, fabrication methods are employed in order to produce the composites, which are of constituents with desirable properties. Because of their biocompatibility, graphene nanomaterials have enormous potential for improving biology and drug delivery. The proposed chapter provides a variety of fabrication methods for sustainable graphene composites and highlights various applications of graphene. Furthermore, graphene nanocomposites are promising multifunctional materials with improved tensile strength and elastic modulus. Despite some challenges and the fact that carbon nanotube/polymer composites are sometimes better in some specific performance, graphene nanocomposites may have a wide range of potential applications due to their outstanding properties and the low cost of graphene. Because these graphene composites have a controllable porous structure, a large surface area, high conductivity, high temperature stability, excellent anti-corrosion properties, and composite compatibility, they can be used in energy storage as electrocatalysts, electro-conductive additives, intercalation hosts, and an ideal substrate for active materials. Meanwhile, the chapter summaries the graphene nanocomposites requirements for technological innovation and scientific applied research.
Atti di convegni sul tema "Fabrication additive hybride":
1
Obata, Kotaro, Shi Bai e Koji Sugioka. "Additive and subtractive manufacturing process by hybrid laser material processing". In Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIV, a cura di Georg von Freymann, Eva Blasco e Debashis Chanda. SPIE, 2021. http://dx.doi.org/10.1117/12.2579336.
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Patterson, Albert E., e James T. Allison. "Manufacturability Constraint Formulation for Design Under Hybrid Additive-Subtractive Manufacturing". In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85637.
Abstract (sommario):
This article addresses the generation and use of manufacturability constraints for design under hybrid additive/subtractive processes. A method for discovering the natural constraints inherent in both additive and subtractive processes is developed; once identified, these guidelines can be converted into mathematical manufacturability constraints to be used in the formulation of design problems. This ability may prove to be useful by enhancing the practicality of designs under realistic hybrid manufacturing conditions, and supporting better integration of classic design-for-manufacturability principles with design and solution methods. A trade-off between design manufacturability and elegance has been noted by many scholars. It is posited that using realistic manufacturing conditions to drive design generation may help manage this trade-off more effectively, focusing exploration efforts on designs that satisfy more comprehensive manufacturability considerations. While this study focuses on two-step AM-SM hybrid processes, the technique extends to other processes, including single-process fabrication. Two case studies are presented here to demonstrate the new constraint generation concept, including formulation of shape and topology optimization problems, comparison of results, and the physical fabrication of hybrid-manufactured products. Ongoing work is aimed at rigorous comparison between candidate constraint generation strategies and the properties of the constraint mapping.
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Alrashdan, Abdulrahman, William Jordan Wright e Emrah Celik. "Light Assisted Hybrid Direct Write Additive Manufacturing of Thermosets". In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24525.
Abstract (sommario):
Abstract In the past recent years, numerous studies have been conducted on additive manufacturing of thermosets and thermoset composites. Thermosets are an important class of polymers used in engineering applications. Monomer units in these material systems irreversibly cross-link when external stimuli or a chemical crosslinking agent is applied in terms of the curing or photopolymerization process. Thermally curing thermosets mark unique mechanical properties including, high temperature resistance, strong chemical bond, and structural integrity and therefore these materials find wide range of applications currently. However, direct write additive manufacturing of these material systems at high resolution and at complex geometries is challenging. This is due to the slow curing rate of thermally curing thermoset polymers which can adversely affect the printing process, and the final shape of the printed object. On the other hand, VAT Polymerization additive manufacturing, which is based on curing the photopolymer resin by Ultraviolet (UV) light, can allow the fabrication of complex geometries and excellent surface finish of the printed parts due to the fast curing rate of photopolymers used in this technique. Mechanical properties of photopolymers, however, are usually weaker and more unstable compared to the thermally curing polymers used in the direct write additive manufacturing method. Therefore, this study focuses on taking the advantages of these two thermoset additive manufacturing methods by utilizing both the thermally cured epoxy and photopolymer resins together. Using the direct writing, the resin mixture is extruded though a nozzle and the final 3D object is created on the print bed. Simultaneously, the deposited ink is exposed to the UV light enhancing the yield strength of the printed material and partially curing it. Therefore, thermally cured epoxy is used to obtain the desirable mechanical properties, while the addition of the photopolymer resin allows the thermoset mixture to partially solidify the printed ink when exposed to the UV light. The results achieved in this study showed that, the hybrid additive manufacturing technology is capable of fabricating complex and tall structure which cannot be printable via additive manufacturing method. In addition, mechanical properties of the hybrid thermoset ink are comparable to the thermally cured thermoset polymer indicating the great potential of the light-assisted, hybrid manufacturing to fabricate mechanically strong parts at high geometrical resolution.
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Oliveira, Marcos B., Alexander Lurie, David Ewen, Philip Long, Taskin Padir e Samuel M. Felton. "Hybrid Fabrication of a Soft Bending Actuator With Casting and Additive Manufacturing". In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97842.
Abstract (sommario):
Abstract In this paper, we present the design, modeling and, fabrication of a soft bending actuator that combines casting techniques and additive manufacturing. We performed tests to evaluate the bending actuator’s angular deflection and tip force. We demonstrated flexibility in the process by varying the bladder material. We also showed the actuator’s resilience to damage by cutting and puncturing the exoskeleton prior to operation. Finally, we integrated the bending actuator into a three-finger gripper configuration and performed a gripping test for four different objects with various weights and shapes. Results show that the curvature and force obtained in these actuators are comparable to other proposed bending actuators with a faster and more adaptable fabrication process. With these results we demonstrate that fast, effective, and versatile fabrication of soft robotic components can be attained by combining casting and additive manufacturing techniques.
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Jonušauskas, Linas, Dovile Andrijec, Tomas Baravykas, Agne Butkute, Titas Tičkūnas, Tomas Gadišauskas e Vytautas Purlys. "Hybrid additive-subtractive femtosecond laser 3D fabrication of medical microdevices (Conference Presentation)". In Laser 3D Manufacturing VII, a cura di Henry Helvajian, Bo Gu e Hongqiang Chen. SPIE, 2020. http://dx.doi.org/10.1117/12.2544578.
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Gupta, Ellen, Zachary Larimore, Mark Mirotznik e Kelvin Nicholson. "Fabrication of conformal metasurface RF devices using 6-axis hybrid additive manufacturing". In 2021 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2021. http://dx.doi.org/10.1109/iceaa52647.2021.9539837.
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Salary, Roozbeh Ross, Jack P. Lombardi, Darshana L. Weerawarne, Prahalad K. Rao e Mark D. Poliks. "A State-of-the-Art Review on Aerosol Jet Printing (AJP) Additive Manufacturing Process". In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-3008.
Abstract (sommario):
Abstract The goal of this work is to forward a comprehensive framework, relating to the most recent research works carried out in the area of flexible and hybrid electronics (FHE) fabrication with the aid of aerosol jet printing (AJP) additive manufacturing process. In pursuit of this goal, the objective is to review and classify a wide range of articles, published recently, concerning various aspects of AJP-based device fabrication, such as material synthesis, process monitoring, and control. AJP has recently emerged as the technique of choice for integration as well as fabrication of a broad spectrum of electronic components and devices, e.g., interconnects, sensors, transistors, optical waveguides, quantum dot arrays, photodetectors, and circuits. This is preeminently because of advantages engendered by AJP process. AJP not only allows for high-resolution deposition of microstructures, but also accommodates a wide renege of ink viscosity. However, AJP is intrinsically complex and prone to gradual drifts of the process output (stemming from ink chemistry and formulation). Consequently, a large number of research works in the literature has focused on in situ process characterization, real-time monitoring, and closed-loop control with the aim to make AJP a rapid, reliable, and robust additive manufacturing method for the manufacture of flexible and hybrid electronic devices. It is expected that the market for flexible electronics will be worth over $50 billion by 2020 [1].
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Al-Badour, Fadi, Ibrahim H. Zainelabdeen, Rami K. Suleiman e Akeem Adesina. "Crack Repair Using Hybrid Additive Manufacturing and Friction Stir Processing". In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93688.
Abstract (sommario):
Abstract A hybrid additive manufacturing (AM) and friction stir processing (FSP) was used to heal a crack in 6 mm thick Al 6061-T6 aluminum alloy. AL-6061 is usually used in H2 high-pressure vessel fabrication as well as aerospace applications. In this work, Al-Si powder was utilized to fill the crack, then FSP was applied to consolidate and stir the powder with the base metal to fill and close the crack zone. Effect of FSP parameters including welding speed and tool rotation speed on the quality of repair was studied. Various mechanical tests, as well as characterization techniques such as hardness test, optical microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS), were employed to study the newly developed hybrid process on the quality of the repair. The investigation revealed that low rotational speed of 800 rpm results in minimum variation in microhardness. Moreover, the impact of welding speed on microhardness is smaller as compared to rotational speed.
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Ding, Peiling, Yunlong Zhang, Xiaoxue Ren e Ming Hu. "Fabrication of SiCp/Cu Composites with SiCw/SiCnp hybrid addition". In 2016 International Conference on Artificial Intelligence and Engineering Applications. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/aiea-16.2016.76.
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Sugioka, Koji, Dong Wu, Jian Xu, Felix Sima e Katsumi Midorikawa. "Hybrid Subtractive and Additive Micromanufacturing using Femtosecond Laser for Fabrication of True 3D Biochips". In CLEO: Applications and Technology. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/cleo_at.2015.ath4a.3.