Ograniczanie wyników
Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 23

Liczba wyników na stronie
first rewind previous Strona / 2 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  stereolitografia
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 2 next fast forward last
EN
The aim of this case study is to generate several poly(ethylene glycol) diacrylate-based hydrogels using additive manufacturing processes. The interest here is in determining different material properties. The test specimens are produced using a commercial stereolithography system. For this purpose, three formulations are prepared. The basis in each case is PEGDA with average molecular weights of 700 Mn, 575 Mn and 250 Mn. A photoinitiator and a UV absorber are added to ensure spatial and temporal cross-linking. Furthermore, the formulations are tested for their material properties according to ISO standards using tensile, compression and hardness tests. An equivalence can be found in the tensile and compression tests. The results with the molecular weights of 700 Mn and 575 Mn show values close to each other. However, the results of the material tests with the molecular weight of 250 Mn are ten times higher. The Shore A hardness values also correlate with the previous tests. These results between molecular weight and material property are particularly striking. A novel aspect of this method could be that the properties determined of these tailor-made high-performance polymers can be applied to different areas of application in an organism.
EN
This paper investigates the effect of additive manufacturing parameters on the manufacturing quality of selected gear mechanism components. Three input variables, and two output variables were determined. The result was the determination of the most optimal combination of key parameters and the determination of regression equations. The concept of manufacturing objects of a very complex shape, by any person, under various conditions through the use of a low-cost device became the basis for this thesis topic. Curing time, layer thickness, and lift speed are among the basic parameters, with a large range of manipulation. A hypothesis was formulated that these three parameters are crucial to produce a part with the smallest possible deviations from the computer model. A handheld scanner was used to scan the samples and compare them with the CAD model. Based on the study, optimal parameters for layer thickness, curing time and lift speed were proposed.
EN
In this study we demonstrate an overview about possibilities in using additive manufacturing for tissue engineering and orthopedic prosthesis. We show the possibilities to produce scaffolds by using a low cost commercial stereolithography system under the use of biocompatible hydrogels like Poly(ethylene glycol) diacrylate. We also demonstrate that it is possible to use a low cost selective laser sintering system to produce individual prostheses to support the healing process in many orthopedic issues.
EN
The presented research deals with the development of the numerical model for resins used for stereolithography (SLA) rapid prototyping. SLA is an additive method of production of models, prototypes, elements or parts of constructions with the use of 3D printing that covers photochemical processes by which light causes chemical monomers to link together to form polymers. Such method is very useful in design visualization, but also can be applied in numerical modelling for the purpose of validation and verifi-cation. In this application the resin strength parameters must be described and on the base of them the numerical material model is developed and validated. Such a study for SLA resins was presented in the paper.
EN
The method of determining the accuracy of polymer molds in plaster forms has been discussed. Distortion of the surface of molds and plaster molds has been assessed. It has been found that the presence of monolithic and porous structure in the samples does not change the accuracy of the surfaces when forms are prepared for removing the material of the model. It has been found that in case of full-mold casting it is more expedient to form the mold cavity with cellular adjustable structures of molding prototypes.
PL
W artykule przedstawiono wybrane aspekty zastosowania stereolitografii w projektowaniu architektonicznym. Głównie skupiono się na wykorzystaniu tej metody drukowania przestrzennego do wykonywania modeli i makiet architektonicznych. Omówiono zalety i wady tego zastosowania zauważone podczas pracy z drukarką 3D działającą w tej technologii.
EN
The article presents several issues on the application of the stereolithography in the architectural design. Mainly, it focuses on using this method of additive manufacturing to making the architectural models. There are discussed in the paper advantages and disadvantages of this application, which were noticed during the work with the 3D printer operating in this technology.
7
Content available remote Accuracy of polymeric dental bridges manufactured by stereolythography
EN
Purpose: Purpose of this paper is to investigate the accuracy of dental bridges produced via digital light projection stereolithography process. Design/methodology/approach: 3D printer Rapidshape D30 was used for manufacturing of two groups of samples – temporary four-part bridges and cast patterns for permanent bridges. The temporary bridges were made of NextDent C+B polymer, while the cast patterns - of NextDent Cast. The samples were manufactured with different layer’s thickness (0.035 mm and 0.050 mm). The geometrical and adjusting accuracy were investigated by measuring of the samples’ dimensions and silicone probe, while the surface roughness was studied out by profile meter and optical microscopy. Findings: It was established that the dimensions of the temporary bridges and the cast patterns, printed with layer thickness 50 µm, are larger than that of the virtual 3D model with 0.1-0.3 mm. Decreasing the layer thickness to 35 µm leads to 0.29%-1.10% smaller sizes of dental bridges and cast patterns in comparison to that of the virtual 3D model. The average roughness deviation Ra of the 3D printed temporary bridges and cast patterns is larger than that of the initial model. As the surface roughness depends on the layer’s thickness, the samples with 0.035 mm layer characterize with lower Ra values. The silicone probe shows that the temporary bridges as well as the cast patterns need additional adjusting in the dental office or corrections during design of the virtual 3D model and 3D printing process in the dental laboratory. Practical implications: The stereolithography as part of CAD/CAM manufacturing process characterizes with high accuracy as a whole. But present study reveals that additional adjusting or preliminary corrections of the design of 3D printing process are needed for dental constructions produced by SLA. Originality/value: The geometrical and fitting accuracy as well as the surface roughness of dental bridges, produced by stereolithography were evaluated. The data, shown in the present study, will help dentists and dental technicians to precise the manufacturing regimes for production of dental constructions with high accuracy.
9
Content available remote Impeller pump development using rapid prototyping methods
EN
Integrated product development based on Rapid Prototyping methods, aided with computer 3D design and computer engineering enables fast and full new product verification and validation, both from technological and customer requirements point of view. A case study derived from industrial practice, using pomp rotor construction is also included.
PL
Metody szybkiego prototypowania, przy wspomaganiu komputerowym projektowania 3D wraz z systemami wspomagania inżynierskiego, pozwalają uzyskać wyrób o prognozowanych właściwościach technologicznych i użytkowych. W artykule przedstawiono studium przypadku zastosowania metod szybkiego prototypowania w rozwoju elementów pomp wirowych.
PL
W artykule przedstawiono możliwości, jakie wiążą się z wykorzystaniem materiałów foto-utwardzalnych (fotopolimerów) w procesach szybkiego wytwarzania prototypów. Opisano budowę i właściwości fotopolimerów oraz możliwości ich modyfikacji w celu uzyskania pożądanych dodatkowych właściwości. Zamieszczono przegląd metod rapid prototyping wykorzystujących fotopolimery. Zaprezentowano również zestawienie wybranych, nowoczesnych fotopolimerów i opisano ich właściwości, także w porównaniu z innymi materiałami wykorzystywanymi do szybkiego wytwarzania prototypów w celu wykazania użyteczności materiałów fotoutwardzalnych i technik je wykorzystujących do szybkiego wytwarzania prototypów.
EN
This paper presents possibilites related with application of photohardened materials (photopo-lymers) in rapid prototyping. Composition and properties of photopolymers were described, along with modification possibilites for obtaining new properties. Paper also contains a short review of RP methods involving photopolymers. Several selected modern photopolymer materials were characterised, also in comparison with other RP materials, aiming to demonstrate usefulness of photopolymers and techniques which use them for rapid prototyping and manufacturing.
EN
This paper presents results of prototyping of cementless THRA endoprosthesis with needle-palisade fixation system designed within the framework of the research project No 4 T07C 056 29. There are presented main instructions for modelling and prototyping according to Rogala's patents (Rogala, patents, 1999). CAD models present fragments of the needle-palisade fixation system, semicircle shaped fragments of the endoprosthesis and preprototype of total THRA endoprosthesis. The modelled elements were saved as STL format and printed with SLA. To verify the possibility of manufacturing of needle-palisade fixation system of the Rogala's cementless THRA endoprosthesis various samples of the fixation system were manufactured by one of direct metal manufacturing (DMM) technology - Selective Laser Melting (SLM). Fragments of needle-palisade fixation system were also manufactured by Electrical Discharge Machining (EDM). The paper presents the variety of designed samples and remarks concerning the producibility the needdle-palisade fixation manufacturing with the considered technologies.
12
Content available remote Nowe materiały w procesach kształtowania przyrostowego wyrobów.
EN
Role of materials in development of rapid-technologies. New materials for Stereo-Litography (SL) method and for Selective Laser Sintering (SLS) method. Extension of materials offer for LaserCusing process. Materials used for Electron Beam Melting (EBM).
PL
Artykuł przedstawia proces wykonania prototypu stożkowej przekładni napędu lotniczego. Szybkie wykonywanie prototypów przekładni o nietypowych zarysach zębów jest możliwe metodami "Rapid Prototyping". Jedną z najdokładniejszych metod szybkiego prototypowania jest stereolitografia, która polega na warstwowym utwardzaniu promieniem lasera fotopolimeru. Metoda ta pozwala zbudowanie modeli kół zębatych o dowolnych kształtach. Za pomocą urządzenia stereolitograficznego SLA-250 wykonane zostały modele kół zębatych przekładni stożkowej. Modele stereolitograficzne mogą służyć do wykonania odlewów. Istotną zaletą prototypów kół zębatych wykonanych z fotoutwardzalnej żywicy jest ich przezroczystość. Zaleta ta pozwala na obserwację chwilowego śladu styku kół zębatych przekładni. Chwilowy ślad styku jest jednym z podstawowych parametrów opisujących prawidłową pracę przekładni. W tym celu przygotowane zostały specjalne modele kół zębatych o zmniejszonej grubości ścianki. Taka budowa pozwoliła na bardziej precyzyjną obserwację śladu styku oraz na zmniejszenia kosztów wykonania modeli. Śledzenie dynamiczne chwilowego śladu styku jest niemożliwe do wykonania tradycyjnymi metodami badawczymi. Zastosowanie metod szybkiego prototypowania daje dobre rezultaty w procesie badań nowych prototypowych przekładni zębatych napędów lotniczych.
EN
The article presents manufacturing process of bevel gears of aircraft power transmission. Rapid prototyping of gears with complex tooth forms is possible with the use of modern methods. One of such methods is the stereo-lithography, where a model is obtained as a result of resin curing with laser beam. This method allows creating gear model with arbitrary tooth form. Bevel gears was carried out by method of stereolitography on SLA 250 apparatus. Gear wheel prototypes were predestined for casting by method losing patterns. One of the best advantages of stereolitography model is its transparency. This advantage allow to observation instantaneous contact ellipses of gear. Instantaneous contact ellipses of gear is one of the most important parameters describe correctly work of gear. Research of instantaneous contact ellipses of gear requires special construction of model gear with thin wall. This construction allows costing reduction of prototype. Observation of instantaneous contact ellipses of gear is not possible by traditional research method. Rapid Prototyping method give good results in research process of new prototype of aircraft transmission gear.
PL
W artykule przedstawiono eksperymentalną metodę wyznaczania chwilowego śladu styku w przekładni zębatej. Do wyznaczenia śladu styku wykorzystano jedną z technik szybkiego prototypowania - stereolitografię. Wykorzystano przezroczysty materiał SL-5170 ułatwiający obserwację chwilowego śladu styku.
EN
The paper contains description of an experimental method of Tooth Contact Analysis (TCA). The instantaneous contact ellipses and bearing area are experimentally determined with use a rapid prototyping (RP) process. A transparent fotohardening resin Sl5170 has been used to observe the instantaneous contact.
PL
W artykule zaprezentowano zagadnienia dotyczące sposobów i środków technicz-nych do kształtowania modeli użytkowych i wytworów z tworzyw polimerowych w produkcji jednostkowej. Bliższej analizie poddano metodę stereolitografii (SL) oraz selektywnego spiekania laserowego (SLS).
EN
Some problems concerning shaping of plastic functional models and products have been revealed in this paper. Following methods like stereolithography (SL) and selective laser sintering (SLS) will be discussed.
EN
Some problems concerning shaping of plastic functional models and products have been revealed in the paper. The methods like stereolithography (SL) and selective laser sintering (SLS) have been analysed in details indicating their limitations and possibilities of further development.
17
Content available remote Wykorzystanie technologii rapid prototyping w odlewnictwie precyzyjnym
PL
Artykuł przedstawia zastosowanie techniki Rapid Prototyping w procesie wytwarzania modeli dla odlewnictwa precyzyjnego. Opracowane zostały modele CAD elementów, których fizyczne modele wykonano metodą stereolitografii. Na bazie modeli stereolitograficznych zostały wykonane ceramiczne formy odlewnicze.
EN
This paper presents Rapid Prototyping using for investment casting process. On the beginning have been create CAD models. This model have been made by stereolitography method. Investment moulding has been create based on stereolitography models.
PL
Pewna część kół zębatych spotykanych w sprzęcie gospodarstwa domowego wykonywana jest z tworzyw sztucznych lub jako metalowe odlewy kokilowe. W artykule przedstawiono metody prototypowania takich kół z wykorzystaniem jednej z technik szybkiego prototypowania - stereolitografii.
EN
Some gears in household are making from plastics by injection moulding and some from metal mould. In the paper the practical application of stereolitography in household gear prototyping process has been presented.
19
Content available remote Określenie przydatności stereolitografii do prototypowania kół zębatych
PL
Stereolitografia jest jedną z metod szybkiego prototypowania (Rapid Prototyping). Pozwala na wykonywanie fizycznych prototypów trójwymiarowych z żywicy fotoutwardzalnej. W niniejszym artykule przedstawiono analizę przydatności stereolitografii do prototypowania kół zębatych.
EN
Stereolitography is the one of Rapid Prototyping (RP) methods. Stereolitography allow to make physical models from the photohardening resin. Stereolitography usability for gears prototyping has been presented.
PL
Technika Rapid Prototyping umożliwia szybkie wykonywanie modeli fizycznych, części wzorcowych i ich modeli na podstawie trójwymiarowego modelu CAD. Coraz powszechniej są one wykorzystywane do rozwoju produktu i przyczyniają się do szybkiego wytwarzania zarówno prototypów, jak i całego produktu. Zakres zastosowań Rapid Prototyping ciągle wzrasta, a szczególnie jest to widoczne w przemyśle motoryzacyjnym, w którym obejmuje on nawet do 25% procent wszystkich prototypowych wyrobów. Tematem artykułu jest koncepcja i konstrukcja urządzenia do wykonywania modeli metodą stereolitografii.
EN
Rapid Prototyping allow us fast making of physically models, standard parts and prototypes on the basics three-dimentional CAD-3D model. This technics become more popular in product development and they contrybute to fast prototype production as well as the whole product. The subject of thi paper is idea and construction Rapid Prototyping devices.
first rewind previous Strona / 2 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.