Wyniki wyszukiwania - BazTech

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Properties of Photocurable Resins Used in a Process of Rapid Prototyping Components of Aircraft Structures

Bernaczek J., Budzik G., Oleksy M., Śliwa R., Mikulski P.

Machine Dynamics Research

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2016

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Vol. 40, No. 3

25--39

EN

This paper presents the results of photopolymers used in rapid prototyping processes exploited in manufacturing of aircraft structural components on the basis of aircraft wheel hubs prototyping methods as Jetting Systems - JS and Stereolithography - SLA. Resins used in these techniques undergo polymerization process under specified conditions to form successive layers of RP model. Depending on the type of resin, the apparatus parameters, operating modes and model setting on the working platform various properties of prototypes are obtained. Knowledge of the actual physical, chemical (gel time, curing temperature, heat resistance) and mechanical parameters (of tensile strength, modulus, toughness, etc.) of the resin allows adequate definition of conditions and size of the load for RP model on the bench and introduce relevant characteristics of the resin in aim to determine the boundary conditions in numerical modeling including finite element method. The paper presents a comparative analysis of the parameters specified by the manufacturer differing from the actual tested strength parameters of RP resin. The standard test models were prepared under certain RP process parameters used to manufacture prototypes of aircraft wheel hubs. Desirability of special materials study for programming of SLA and JS prototyping processes was demonstrated by documented achievement of very good aircraft wheel hub prototype ensuring good prototyping effect for other elements of aircraft structures manufactured using different methods.

2

The rapid prototyping of aircraft wheel hub model with the use of techniques JS, SLA, FDM

Śliwa R. E., Budzik G., Bernaczek J., Dziubek T.

Journal of KONES

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2011

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Vol. 18, No. 3

439-443

EN

Design work related to the implementation of new aerospace elements requires the use of 3D-CAD modelling techniques and rapid prototyping, which makes it possible to significantly accelerate the deployment of new solutions. The article presents the possibility of using some methods of rapid prototyping to produce the research model of a wheel hub forming part of the landing gear. Incremental rapid prototyping methods - JS (Jetting System), SLA (Stereolithography), FDM (Fused Depositing Modelling) - have been characterized with regard to the technology of executing a hub model, the parameters of the manufacturing apparatus, and comparing basic technical data of materials used in the analyzed processes. One of the elements of the process of prototyping was to process data in other equipment for rapid prototyping. This process consisted of the following steps: defining the parameters of model building, determining the appropriate model settings in the workspace of manufacturing equipment, editing the supporting structure, verifying the subsequent layers through the simulation of model building process, generating output numerical procedures for manufacturing equipment. Manufactured prototypes have been evaluated of dimensional accuracy with the use coordinate measuring machine. Also measured the surface roughness. Conducted studies were the basis to determine the applicability of various methods of rapid prototyping in the process of research and manufacturing aircraft wheel hub.

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Computational methods in the SLA and FDM techniques in the process of production of an aircraft wheel hub prototype

Bernaczek J., Śliwa R. E.

Computer Methods in Materials Science

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2011

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Vol. 11, No. 2

418-424

EN

The rapid prototyping process was carried out on the example of an aircraft wheel hub and the key role of information operations performed at each stage was stressed. The design and its verification in a CAD system environment was completed. Parts were assembled and tested on their mutual cooperation. Basing on the model of 3D CAD a model of finite elements method was constructed and the tension distribution analysis was made. Tasks performed, supported by the CAD algorithms, made it possible to generate a finał version of the solid model. On its basis, an STL model constituting a base for the process of RP was developed and verified. Using software tools RP processes SLA and FDM were developed. The simulation of overlapping layers was carried in order to eliminate errors in the relevant physical processes. The numerical routines were generated for the apparatus : SLA 250/50 and uPrint. Prototypes of hub were made on the basis of stereolithography techniques and liquid plastic modeling. The coordinate measurements of models were carried out and errors specific to each method were analyzed.

PL

Przeprowadzono proces szybkiego prototypowania na przykładzie piasty koła samolotu podkreślając kluczową rolę operacji informatycznych wykonywanych na każdym jego etapie. Zrealizowano konstrukcję oraz jej weryfikację w środowisku systemu CAD. Dokonano złożenia części oraz sprawdzono ich wzajemną współpracę. W oparciu o model 3D CAD zbudowano model do analizy metodą elementów skończonych oraz przeprowadzono analizę rozkładu naprężeń. Wykonane zadania, wspierane przez algorytmy CAD, pozwoliły na wygenerowanie finalnej wersji modelu bryłowego. Na jego podstawie opracowano i zweryfikowano model STL stanowiący bazę dla procesu RP. Korzystając z narzędzi programowych RP opracowano procesy SLA oraz FDM. Przeprowadzono symulację nakładania kolejnych warstw celem wyeliminowania błędów we właściwym procesie fizycznym. Wygenerowano procedury obsługi numerycznej dla aparatury SLA 250/50 oraz uPrint. Wykonano prototypy piasty technikami stereolitografii oraz modelowania ciekłym tworzywem. Przeprowadzono pomiary współrzędnościowe modeli analizując błędy charakterystyczne dla każdej z metod. Procesy szybkiego prototypowania wspierane przez szereg narzędzi programowych pozwoliły wyselekcjonować i określić standardy zastosowania metod obliczeniowych do wykonywania modeli elementów konstrukcji. Zaostrzone wymogi w odniesieniu do konstrukcji lotniczych wykonywanych technikami RP wymuszają konieczność określenia szczególnych procedur obsługi numerycznej co stanowi przedmiot niniejszej pracy.

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Application of rapid prototyping - SLA, FDM - to manufacture model of aircraft wheel hub

Śliwa R. E., Budzik G., Bernaczek J.

Journal of KONES

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2010

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Vol. 17, No. 3

423-429

EN

Implementation of prototypes of the aircraft is a complex process - which requires a series of operations on data preparation, maintenance and inspection of the measuring apparatus. The development overlooks the stage of design and CAD modelling which is the subject of separate publications, and presents only issues related to the RP process - the SLA and FDM. Special attention was paid to the need to properly export to CAD models as STL and subseąuent analysis of the surface after tessellation (preview generated triangle mesh describing the model). The process of preparing data in dedicated utility software is a key step for the correct implementation of the prototype aircraft wheel hub. The correct position of the working models on the platform, generated automatically supports editing and verification output files (simulation analysis of overlapping layers) minimizes the risk of damage during the prototyping process itself as well as the subsequent finishing. The final chapter presents the coordinate measuring of made prototypes that will help identify areas of application methods of RP in the aerospace industry. Prototype SLA is marred by a higher error than the FDM model but allows for effective finishing operations, which eliminates the geometric errors and significantly improves the quality of the surface.