Bibliografie tematiche / Additive manufacturing, filament autoloader, FDM, 3D printer

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Letteratura scientifica selezionata sul tema "Additive manufacturing, filament autoloader, FDM, 3D printer"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Additive manufacturing, filament autoloader, FDM, 3D printer"

Lee, Ching Hao, Farah Nadia Binti Mohammad Padzil, Seng Hua Lee, Zuriyati Mohamed Asa’ari Ainun e Luqman Chuah Abdullah. "Potential for Natural Fiber Reinforcement in PLA Polymer Filaments for Fused Deposition Modeling (FDM) Additive Manufacturing: A Review". Polymers 13, n. 9 (27 aprile 2021): 1407. http://dx.doi.org/10.3390/polym13091407.

Testo completo

Abstract (sommario):

In this review, the potential of natural fiber and kenaf fiber (KF) reinforced PLA composite filament for fused deposition modeling (FDM) 3D-printing technology is highlighted. Additive manufacturing is a material-processing method in which the addition of materials layer by layer creates a three-dimensional object. Unfortunately, it still cannot compete with conventional manufacturing processes, and instead serves as an economically effective tool for small-batch or high-variety product production. Being preformed of composite filaments makes it easiest to print using an FDM 3D printer without or with minimum alteration to the hardware parts. On the other hand, natural fiber-reinforced polymer composite filaments have gained great attention in the market. However, uneven printing, clogging, and the inhomogeneous distribution of the fiber-matrix remain the main challenges. At the same time, kenaf fibers are one of the most popular reinforcements in polymer composites. Although they have a good record on strength reinforcement, with low cost and light weight, kenaf fiber reinforcement PLA filament is still seldom seen in previous studies. Therefore, this review serves to promote kenaf fiber in PLA composite filaments for FDM 3D printing. To promote the use of natural fiber-reinforced polymer composite in AM, eight challenges must be solved and carried out. Moreover, some concerns arise to achieve long-term sustainability and market acceptability of KF/PLA composite filaments.

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Alsoufi, Mohammad, e Abdulrhman Elsayed. "Quantitative analysis of 0% infill density surface profile of printed part fabricated by personal FDM 3D printer". International Journal of Engineering & Technology 7, n. 1 (6 gennaio 2018): 44. http://dx.doi.org/10.14419/ijet.v7i1.8345.

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Abstract (sommario):

Fused deposition modeling or FDM technology is an additive manufacturing (AM) technology commonly used for prototyping applications which suffer seriously from low levels of fluctuated surface finish quality, demanding some hand ﬁnishing tool for even the necessary levels of 3D printed parts. This paper, therefore, aims at giving close attention to the variation in the surface roughness profile between the inner and the outer faces of FDM 3D printed parts based on advanced polylactic acid (PLA+) thermoplastic filament material. The surface roughness is quantitatively analyzed using a contact-type test-rig with a 90° angle measurement on each face along with each zone and sub-zone. The obtained results revealed that the surface finish of the inner faces is rougher than those of the outer faces as regards nozzle temperature, nozzle diameter, infill density and layer height is 220°C, 0.5 mm, 0% and 0.3 mm, respectively. The personal FDM 3D printer is thus confirmed to be an excellent platform, flexible, straightforward and cost-effective.

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Stoica, Constantin-Romica, Raluca Maier, Anca Istrate e Andrei-Cristian Mandoc. "Assessment of Static Mechanical Properties of Additively Manufactured Polylactic Acid (PLA) on Entry-Level FDM 3D Printer". Materiale Plastice 58, n. 2 (5 luglio 2021): 176–84. http://dx.doi.org/10.37358/mp.21.2.5489.

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Abstract (sommario):

The paper presents the study on the static mechanical properties of PLA (Polylactic Acid) produced with entry-level additive technologies using three printing directions. During the experimental work were tested a total of 15 �dog bone� ASTM D638-14 standard specimens made from additively manufactured polymer (PLA) through FDM (Fused Deposition Modelling) technique, where the material and rectilinear pattern infill geometry and infill percentage of 100% were constant and the printing orientation was varied. Usually technical data sheets that are delivered by filament materials producers include the most satisfactory data which are valid for only one specific printing direction. The printing direction is deliberately selected, in such way that the best material characteristics are achieved. In addition to this matter, as the additive manufacturing market grew significantly in the past couple of years, the filament production market showed a consequential growth. The aftermath of this expansion had a direct impact towards the quality and costs of the filaments used for 3D printing, in order to satisfy both the low-end and high-end users. Therefore, in this frame, the present research provides entry-level additively manufactured PLA performances showing significant changes depending on the different printing directions and determine the build orientation influence on the mechanical properties, in the aim of providing aid for both mechanical designer and product manufacturer at the stage of the printed product mechanical properties.

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Calcagnile, Paola, Gabriele Cacciatore, Christian Demitri, Francesco Montagna e Carola Esposito Corcione. "A Feasibility Study of Processing Polydimethylsiloxane–Sodium Carboxymethylcellulose Composites by a Low-Cost Fused Deposition Modeling 3D Printer". Materials 11, n. 9 (1 settembre 2018): 1578. http://dx.doi.org/10.3390/ma11091578.

Testo completo

Abstract (sommario):

Additive manufacturing (AM) techniques allow the construction of complex physical models reproducing the content of a specific CAD file, and, among them, Fused Deposition Molding (FDM) stands out for its many advantages. The aim of the present work is to perform a feasibility study of 3D printing of a model of human heart to be used to simulate surgical operations or for training through a two-step method based on extrusion and FDM processes. To this purpose, typical extrusion instrumentation and a simple and low-cost FDM printer are employed, in combination with a thermoplastic polydimethylsiloxane (PDMS), chosen for its transparency, flexibility, and high resistance to multiple agents and aging. To improve its tactile properties and mimic the slimy effect of living organs, sodium carboxymethylcellulose (Na–CMC) fibrils are added to it. The starting materials, the neat PDMS filament and the composite one, are deeply characterized in terms of structural, thermal, and rheological properties in order to fix the most suitable extrusion and FDM parameters. The composite filaments show larger diameter and roughness, which cause undesirable effects during 3D printing, such as episodic nozzle obstruction, and exhibit a faster degradation, making the FDM step difficult. Nevertheless, the major issues are related to the low crystallinity degree of the employed polymer. The feasibility study carried out leads to the printing of composite layers, even though far from the desired final target. Possible solutions to print the fully characterized Na–CMC/PDMS composite are addressed in the conclusion of this work.

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Romero, Andres E., Marcelo T. Piovan, Carlos A. Mainetti, Darío Stechina, Sandra Mendoza, Héctor D. Martín e Norberto C. Maggi. "Tensile Properties of 3D Printed Polymeric Pieces: Comparison of Several Testing Setups". Ingeniería e Investigación 41, n. 1 (12 marzo 2021): e84467. http://dx.doi.org/10.15446/ing.investig.v41n1.84467.

Testo completo

Abstract (sommario):

This work aims to evaluate and compare variations of a methodology for performing tensile tests on thermoplastic specimens constructed by additive manufacturing technologies (AMT) with filament deposition modeling (FDM). The testing procedures of pieces made in FDM machines do not yet have any conclusive standards because 3D printing, as a disruptive and exponentially growing technology, has not allowed enough time to reach a definitive scientific consensus. Nowadays, testing standards for injected thermoplastic parts or laminated composites are employed as substitutes with careful implementation. A comparative study was carried out on the elasticity modulus, determined within the framework of the same standard but with different measuring devices and testing machines. These machines cover a broad range from professional automated high precision machines to lab and specialized machines. Sets of 3Dprinted specimens with identical manufacturing parameters were constructed in a commercial 3D printer. An analysis of variance was performed in order to evaluate the consistency and significance of experimental data for the same polymer, considering the machine type and its corresponding setup. From the experimental data, it is concluded that, with the due care, all evaluated testing setups can reach comparable results, especially in the absence of sophisticated and expensive measuring systems.

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Itoh, Takashi, e Takumi Nakano. "Optimization of Degreasing-Sintering Process for Mg2Si/PLA Mixture and Influences of Additive Amount of Al on Sintered Density and Thermoelectric Performance of Mg2Si Fabricated by the Optimized Process". MRS Advances 5, n. 10 (2020): 459–67. http://dx.doi.org/10.1557/adv.2020.87.

Testo completo

Abstract (sommario):

ABSTRACTFused deposition modelling (FDM) type of 3D printing is widely used for manufacturing complex shaped polymer products. Recently, the metal/polymer composite products can be made by 3D printer using metal/polymer composite filament. Now, we are planning to develop a new manufacturing process of the thermoelectric (TE) elements or modules by combining the FDM-type 3D printing and the degreasing-sintering process. In this work, we focused on the degreasing-sintering process of the mixture of Mg2Si and polylactic acid (PLA) powders. Mg2Si compound powder was synthesized by a liquid-solid phase reaction (LSPR) method. The powder mixtures of Mg2Si, Al and PLA were pressed and heated in a pulse discharge sintering (PDS) chamber under a vacuum in various degreasing conditions. Following the degreasing, the sintering of Mg2Si was carried out in the same PDS chamber at various starting sintering temperatures. Sintered density, Seebeck coefficient and electrical resistivity of the consolidated Mg2Si were measured and the power factor as a TE performance was estimated from the TE properties. The optimum conditions of degreasing-sintering process maximizing the sintered density and the TE performance of Al-doped Mg2Si were investigated. Furthermore, the influences of the additive amount of Al on the sintered density and the TE performance of Mg2Si fabricated via the optimized degreasing-sintering process were investigated.

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Pendrill, L. R., A. Allard, N. Fischer, P. M. Harris, J. Nguyen e I. M. Smith. "Software to Maximize End-User Uptake of Conformity Assessment With Measurement Uncertainty, Including Bivariate Cases. The European EMPIR CASoft Project". NCSL International Measure 13, n. 1 (febbraio 2021): 58–69. http://dx.doi.org/10.51843/measure.13.1.6.

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Abstract (sommario):

Facilitating the uptake of established methodologies for risk-based decision-making in product conformity assessment taking into account measurement uncertainty by providing dedicated software is the aim of the European project EMPIR CASoft(2018–2020), involving the National Measurement Institutes from France, Sweden and the UK, and industrial partner Trescal (FR) as primary supporter. The freely available software helps end-users perform the required risk calculations in accordance with current practice and regulations and extends that current practice to include bivariate cases. The software is also aimed at supporting testing and calibration laboratories in the application of the latest version of the ISO/IEC 17025:2017 standard, which requires that“…the laboratory shall document the decision rule employed, taking into account the level of risk […] associated with the decision rule and apply the decision rule.” Initial experiences following launch of the new software in Spring 2020 are reported.

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Tesi sul tema "Additive manufacturing, filament autoloader, FDM, 3D printer"

Caselli, Lorenzo. "Progettazione di un sistema di caricamento automatico del filamento di una stampante 3D". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Abstract (sommario):

L’attività descritta nel presente elaborato è relativa alla prima fase di sviluppo di un innovativo sistema di caricamento automatico del filamento per una stampante 3D, prodotto da un’azienda che opera nel settore. In particolare, la progettazione meccanica qui illustrata è stata affrontata partendo dal progetto concettuale del nuovo dispositivo, per concludersi con il progetto costruttivo e il dimensionamento dei singoli componenti. In primo luogo, è stata effettuata un’analisi funzionale del problema, analizzando sistematicamente le specifiche tecniche richieste ed i vincoli di progetto dettati dall’azienda. Scomposto il problema in tal modo, sono state proposte ed analizzate soluzioni concettuali alternative, valutandone comparativamente punti di forza e criticità. Una volta individuata la soluzione ritenuta più vantaggiosa, si sono dimensionati opportunamente i componenti commerciali (e scelti a catalogo) e progettati quelli da realizzare ad hoc (con processo di produzione in additive manufacturing, secondo le richieste dell’azienda). L’elaborato è parte integrante di un progetto che prevede le successive fasi di prototipazione e programmazione del controller del sistema di caricamento automatico del filamento.

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Atti di convegni sul tema "Additive manufacturing, filament autoloader, FDM, 3D printer"

Sukindar, Nor Aiman, Azib Azhari Awang Dahan, Sharifah Imihezri Syed Shaharuddin e Nor Farah Huda Abd Halim. "Performance of Low-Cost 3D Printer in Medical Application". In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-63208.

Testo completo

Abstract (sommario):

Abstract Fused Deposition Modelling (FDM) is an additive manufacturing (AM) process that produces a physical object directly from a CAD design using layer-by-layer deposition of the filament material that is extruded via a nozzle. In industry, FDM has become one of the most used AM processes for the production of low batch quantity and functional prototypes, due to its safety, efficiency, reliability, low cost, and ability to process manufacturing-grade engineering thermoplastic. Recently, the market is flooded with the availability of low-cost printers produced by numerous companies. This research aims to investigate the effect of different porosity levels on a scaffold structure produced using a low-cost 3D printer. Comparisons of these porous structures were made in terms of Von-Mises strain, total deformation, as well as compressive stress. Various porosity levels were created by varying printing parameters, including layer height, infill density, and shell thickness by slicing the initial solid CAD file using Repetier Host 3D printing software. Finite Element Analysis (FEA) simulation was then performed on the created scaffold structures by using Ansys Workbench 19.2. The simulation result indicates that the greater porosity level will result in higher total deformation of the structure. Meanwhile, the compression test shows that the minimum strength value obtained was favourable at 22 MPa and had exceeded that of the trabecular femur (15 MPa). However, its porosity level (maximum at 52%) was still below that of the minimum threshold of porosity level of 70 percent. However, the printing parameters currently used can be adjusted in the future. Therefore, it was deduced that the low-cost 3D printer offers promising potential to fabricate different porosity structures with multiple outcomes.

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