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    Wyświetlanie 1-6 z 6
    Tytuł:
    Comparison of 3D printing MJP and FDM technology in dentistry
    Autorzy:
    Taczała, J.
    Czepułkowska, W.
    Konieczny, B.
    Sokołowski, J.
    Kozakiewicz, M.
    Szymor, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818497.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    CAD/CAM
    dental materials
    FDM
    MJP
    3D printing
    materiały dentystyczne
    drukowanie 3D
    Opis:
    Purpose: Many printers are tempting at low prices, but later their accuracy turns out to be insufficient. The study has included checking the accuracy of printing and reproducing details of 3D printers used in dental technology and dentistry such as MultiJet Printing (ProJet MP3000, 3D Systems) and Fused Deposition Modelling (Inspire S2000, Tiertime). Design/methodology/approach: The 3D prints were created from scans of the maxillary gypsum model with the loss of left premolar. In the test, objects were set to the X and Y-axis. In order to check the dimensional differences after printing, scans of the printed models were superimposed on scans of the plaster model in the GOM Inspect V8 SR1 (Braunschweig, Germany). The focus was on the distance of scans from each other and a deviation map was created for each object. Findings: The average absolute value of deviations for each of models were equalled: FDM- for X-axis 0.06 ± 0.04 mm, for Y-axis 0.07 ± 0.04 mm; MJP- for X-axis- 0.04 ± 0.02 mm, for Y-axis- 0.06 ± 0.02 mm. A chart of arithmetic averages calculated for each tooth for the best printouts in each series show that higher deviation values exist in case of FDM printout. The models printed in the X-axis have smaller values of deviations from those printed in the Y-axis. Practical implications: MultiJet Printing technology can be used to create more precise models than the FDM, but these printouts meet the requirements of dimensional accuracy too. Originality/value: CAD / CAM technology in the future will exist in every dental technology laboratory so it is important to be aware of the way the 3D printers works. By paying attention to the quality of detail reproduction, a Dental Technician is able to choose the best 3D printer for them.
    Źródło:
    Archives of Materials Science and Engineering; 2020, 101, 1; 32--40
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving stability of an ecological 3D-printed house - a case study in Italy
    Autorzy:
    Es-sebyty, H.
    Igouzal, M.
    Ferretti, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2105504.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    printing
    construction
    improve the stability
    seismic zone
    earth building
    drukowanie
    konstrukcja
    poprawa stabilności
    strefa sejsmiczna
    budownictwo ziemne
    Opis:
    Purpose: The structure WASP’S GAIA house printed without beams and columns; therefore, it’s not safe enough against earthquake or wind. Moreover, the structure printed layer by layer doesn’t present a good stability for build other floor in seismic zones. The aim of this work is to study stability of this house and give new technique to improve stability of the ecological house printed in 3D. Design/methodology/approach: For resolving this problem we considered the structure printed in 3D is simulated with rammed earth characterized by a horizontaly striped and the basic principles of seismic justification are similar to unreinforced mansory, we use spectral analysis method in order to find a maximum displacement induced by a seismic excitation and robot structural analysis software to analyze the mechanical resistance of the studied structure. Findings: The center of gravity approaches the twist center, presented in the results, which prove a good stability of the structure when we use circular beams and columns fabricate with wood material. We carried out three analyses: A modal analysis with 4 vibration mode when the cumulative mass reaches 99.98%. A seismic analysis according to the moroccanearthquake construction regulations (RPS 2011). Use natural beams and culumns to improve the stability of a structure with one wall and two walls, in the case of with or without reinforcement can prove a good stability. Compromising between ecology, safety and technology. Increase the mechanical characteristics to increase safety and prevents collapse in the seismic zones. The possibility of exploiting our cultural heritage with the development of other complex design in the field of construction. Research limitations/implications: The possibility of exploiting our cultural heritage with the development of other complex design in the field of construction. Development the diameter of crane wasp 3D printer. Practical implications: Exploiting this technology in the case of a natural catastrophic (seism, inundation, pandemic) to build safe and ecological building in the seismic zones. Build safe schools in the poor area for children. Originality/value: Development the design of GAIA WASP printed in 3D with two walls and other zones to improve the stability of house. Add natural beams and columns made by wood or bamboo inside the house printed with one wall, and two walls. Study the stability of house to obtain the twist centre approaches to centre of gravity. We carried out three analyses: A modal analysis with 4 vibration mode when the cumulative mass reaches 99.98 %, a seismic analysis, and a spectral analysis of the maximum acceleration.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 111, 1; 18--25
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoplastic polyurethanes for mining application processing by 3D printing
    Autorzy:
    Mrówka, M.
    Szymiczek, M.
    Lenża, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/367236.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    thermoplastic polyurethane
    3D printing
    mechanical tests
    aging
    processing
    poliuretan termoplastyczny
    drukowanie 3D
    badania mechaniczne
    starzenie
    przetwarzanie
    Opis:
    Purpose: Thermoplastic polyurethanes (TPU) found application in mining. Due to the excellent processing properties, thermoplastic polyurethanes can be also use to make elements that would facilitate miner's work. These elements, however, differ in dimensions depending on the person who is going to use them, that is why they should be personalized. In case of all the above studies, the elements or stuffs were made by means of the injection method. This method limits the possibility of producing mining’s stuff only to models that have a mould. The 3D printing technology developing rapidly throughout the recent years allows for high-precision, personalized elements’ printing, made of thermoplastic materials. Design/methodology/approach: The samples from thermoplastic polyurethanes were made using 3D printing and then subjected to the aging process at intervals of 2, 7 and 30 days. The samples were then subjected to a static tensile tests, hardness tests and FT-IR spectroscopy. Findings: The obtained results of mechanical tests and IR analyses show that the aging process in mine water does not affect the mechanical properties of the samples regardless of the aging time. IR spectral analysis showed no changes in the structure of the main and side polyurethane chains. Both mechanical and spectral tests prove that polyurethanes processed using 3D printing technology can be widely used in mining. Research limitations/implications: Only one type of TPU was processed in this work. Further work should show that synthetic mine water does not degrade the mechanical properties of other commercially available TPUs. Practical implications: The additive technology allows getting elements of mining clothing, ortheses, insoles or exoskeleton elements adapted to one miner. Originality/value: The conducted tests allowed to determine no deterioration of the mechanical properties of samples aged in synthetic mine water. TPU processing using 3D printing technology can be used in mining.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 95, 1; 13-19
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topology optimization of a 3D part virtually printed by FDM
    Autorzy:
    Antar, I.
    Othmani, M.
    Zarbane, K.
    El Oumami, M.
    Beidouri, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172164.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    topology optimization
    fused deposition modelling
    virtually 3D printed part
    SIMP
    optymalizacja topologii
    modelowanie osadzania stopionego
    drukowanie 3D
    Opis:
    Purpose This research work aims to exhibit the possibility to topologically optimize a mesostructured part printed virtually by FDM taking into account the manufacturing parameters. Design/methodology/approach The topology optimization of a 3D part printed by FDM was carried out using the software ABAQUS. On the other hand, a numerical approach using a script based on G-code file has been achieved to create a virtual model. Then, it was optimized according to the Solid Isotropic Material with Penalization (SIMP) method, which minimizing the strain energy was the objective function and the volume fraction of 30% was the constraint. Findings The final topological optimization design of the virtual model is approximately similar to the homogeneous part. Furthermore, the strain energy of the virtual model is less than the homogeneous part. However, the virtually 3D optimized part volume is higher than the homogeneous one. Research limitations/implications In this study, we have limited our study on one layer owing to reduce the simulation time. Moreover, the time required to optimize the virtual model is inordinate. The ensuing study, we will optimize a multiple layer of the mesostructure. Practical implications Our study provides a powerful method to optimize with accurately a mesostructure taken into consideration the manufacturing setting. Originality/value In this paper, we have studied through an original approach the potential of topology optimization of a 3D part virtually printed by FDM. By means of our approach, we were able to optimize topologically the 3D parts printed by FDM taking into account the manufacturing parameters.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 1; 25--32
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the adhesion between TPU and PLA in multi-material 3D printing
    Autorzy:
    Brancewicz-Steinmetz, E.
    Valverde Vergara, R.
    Buzalski, V. H.
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201075.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    multi-material printing
    PLA
    TPU
    FDM
    adhesion
    druk wielomateriałowy
    drukowanie 3D
    tworzywo PLA
    termoplastyczny poliuretan
    technologia FDM
    adhezja
    Opis:
    Purpose In the Fused Filament Fabrication (FFF/FDM) technology, the multi-material manufacturing additive method is achieved by a single nozzle or multiple nozzles working simultaneously with different materials. However, the adhesion between different materials at the boundary interface in FDM multi-material printing is a limiting factor. These studies are concerned with improving and study the adhesion between two polymers. Design/methodology/approach Due to the numerous applications and possibilities of 3D printed objects, combining different materials has become a subject of interest. PLA is an alternative to the use of petrochemical-based polymers. Thermoplastic Polyurethane is a flexible material that can achieve different characteristics when combined with a rigid filament, such as PLA. To improve the adhesion between PLA and TPU in multi-material FFF/FDM, we propose the comparison of different processes: post-processing with acetone immersion, surface activation during printing with Acetone, surface activation during printing with tetrahydrofuran, post-processing annealing, and connection of printed parts with tetrahydrofuran. Findings Modifying the 3D printing process improved the quality of the adhesive bond between the two different polymers. Activation of the surface with THF is the treatment method recommended by the authors due to the low impact on the deformation/degradation of the object. Research limitations/implications In the study, adhesion was considered in relation to the circular pattern of surface development. Further analysis should include other surface development patterns and changes in printing parameters, e.g. process temperatures and layer application speed. Practical implications 3D printing with multi-materials, such as PLA biopolymer and thermoplastic polyurethane, allows for the creation of flexible connections. The strengthening of the biopolymer broadens the possibilities of using polylactide. Examples of applications include: automotive (elements, where flexible TPU absorbs vibrations and protects PLA from cracking), medicine (prostheses with flexible elements ensuring mobility in the joints). Originality/value Multi-material printing is a new trend in 3D printing research, and this research is aimed at promoting the use and expanding the possibilities of using PLA biopolymer.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 115, 2; 49--56
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digitally designed casting ring and sprue system - a contemporary approach to the casting process in dentistry
    Autorzy:
    Penchev, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200612.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    3D printing
    digital sprue system
    casting
    denture pattern
    dentistry
    drukowanie 3D
    cyfrowy system wlewowy
    odlew
    wzór protezy
    stomatologia
    Opis:
    Purpose: The current paper aims to present a new casting approach in dentistry by eliminating some conventional preliminary procedures and digitalising the process as much as possible. Design/methodology/approach: The experiment uses six digital crown patterns. They are aligned with each other and to the wall of a virtual casting ring. Then a digital sprue system is created. The object alignment and sizes are revised, and the optimal correlation is set. Finally, a single virtual object is created and is 3D printed of light curing acrylic resin suitable for casting, invested, and cast. Findings: The castings that are achieved have good quality and no defects. At the same time, the virtual designing and aligning of the patterns and all the components of the sprue system and casting ring save much time and allows better precision to be achieved. All these facts allow better control of the casting process results, making the process faster, more predictable, and more accurate. Research limitations/implications: The limitations of this study concerns pattern selection. It is well-known that the acrylic resin sublimates and expands massively during a temperature rise, which may cause mould fracture. This obstacle is very representative as solid objects with higher volumes are examined. This may enforce alignment revision or even temperature rate modification. Practical implications: Suggested approach will be very useful for daily dental laboratory practice by optimizing the working time of the dental technician, making the denture production process faster, more predictable, and more accurate. As a result, the process optimizes the working process in dental offices, by allowing shortening the time of each visit and treatment plan terms. Originality/value: Presented approach reveals some new opportunities for dental technicians to substitute the conventional raw stages of sprue system fabrication with digital planning and designing. This allows dental technicians to take advantage of the full potential of digital technologies.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 119, 1; 31--41
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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