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3D Lattice Structures for Application in Selective Laser Melting technology
Červinek, Ondřej ; Škaroupka, David (referee) ; Vrána, Radek (advisor)
Additive technologies allow manufacturing of components with very complex shapes which are difficult to manufacture with conventional technologies. Among these technologies belongs the Selective Laser Melting (SLM). Suitable applications of SLM include manufacturing of light-weight 3D structures like lattice structure or an organic geometry called gyroid. This bachelor thesis is focused on creation of models of gyroid structure and its application to parts followed by manufacturing with SLM. Series of models were made with mathematical software. Implicitly defined equation were used for better geometry coordination of created models. Options utilization and manufacturability of gyroid structures were tested within application into turbocharger impeller. At the end of this thesis was successfully manufactured the impeller including two types of gyroid structure (single-gyroid and double-gyroid)
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Prototype part and made by method rapid prototyping
Kočárek, Karel ; Dvořáček, Jan (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis is dealing with prototype stage during development of reduction part for gas flow control, which is positioned in gas boiler downstream of the valve. Thesis is focused on additive manufacturing. Basic technologies, their attributes and procedures which are necessary to be followed are described here. Practical part is composed of 3D model creation in CAD software, export of model to STL format and its inspection for compactness. After that 3D model is sent to printer and functional components are made, that can be used for application verification and for detection of possible design deficiencies before the mold assembly is made.
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Advanced filaments for FDM/FFF 3D printing
Kučera, Jan ; Vespalec, Arnošt (referee) ; Koutecký, Tomáš (advisor)
The bachelor thesis deals with the issue of FDM/FFF 3D printing with a focus on rapidly evolving new filaments and their use in industry. The aim of this work is to display a large number of filaments that have been tested and to categorize them into individual groups for future use. Selected tested materials from scientific studies address both the mechanical properties of individual pure filaments and the effect of additives to these filaments. The analysis of these works then showed that the effect of carbon fiber varies according to the type of base material and the weight percentage of filling. From a practical point of view, the results of this work can be used in the choice of material for printing models and prototypes for own usage.
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Innovation of the Rep Rap 3D Printer
Zítka, Lukáš ; Zemčík, Oskar (referee) ; Sedlák, Josef (advisor)
The present Master thesis is focused on innovation and verification of the functionality of a 3D RepRap. The theoretical part of the thesis characterizes individual additive technologies. The practical part is focused on the design of the technical modifications of the printer in order to achieve the quality of the printing, while the current 3D printer design is compared with the innovative solution. The practical part tests the setting of print parameters, various materials for 3D printing and necessary finishing operations. The thesis is completed
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Production line optimalization by using SLS aditive technology
Nakládalová, Tereza ; Marek, Jiří (referee) ; Knoflíček, Radek (advisor)
This diploma thesis is focused on additive manufacturing, especially on technology Selective Laser Sintering (SLS) and the implementation of additive manufacturing into existing departments of industry, where current elements of systems are supplemented or directly replaced by new parts produced by these technologies. This thesis solves specific project of manipulation unit for manufacturing line. The main goals of the issue are analysis of current construction design and its deficiency, designing and optimalization of this unit in relation to SLS manufacturing technology, product realization and final evaluating of reached results. Part of the thesis is also design documentation.
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Development of photosensitive ceramic suspensions for 3D printing of porous bioscaffolds
Ravasová, Michaela ; Novotná, Lenka (referee) ; Částková, Klára (advisor)
The aim of the diploma thesis is the development of light-sensitive ceramic suspensions for the creation of porous bioscaffolds using 3D printing. The suspensions were based on aluminum oxide in the first phase and, in the second phase of the experimental part, on calcium phosphate. The theoretical part of the thesis focuses on describing human bone and the properties of bioscaffolds, providing an overview of biomaterials and methods for preparing porous bioceramics, along with a summary of previous results achieved by other scientific groups in the field. The experimental part describes the development of the suspensions. The influence of monomers, photoinitiators, dispersants, and ceramic powders on the properties of the suspensions and their photopolymerization ability was observed. By optimizing the suspensions, a suitable composition for 3D printing of scaffolds from aluminum oxide was achieved. The amount of dispersant and ceramic powder was determined based on rheological measurements, and the ratio of monomers and initiator content was adjusted according to gelation tests, where the dependence of resin polymerization on the illumination time was monitored. The suspensions were subsequently printed and sintered. The microstructure of the sintered bodies was characterized with a focus on defects specific to the debinding process. After creating a suspension suitable for 3D printing from aluminum oxide, the same procedure was applied to develop suspensions based on calcium phosphates. The outcome of the diploma thesis is a suspension based on aluminum oxide or tricalcium phosphate prepared from a mixture of di- and tetrafunctional acrylates in a weight ratio of 1:1, with 73-77 wt.% or 65 wt.% powder filling and 2 wt.% or 3 wt.% dispersant. The suspension is suitable for stereolithographic 3D printing of thin-walled bodies for biomedical applications.
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Additive technologies in the automotive industry
Beneš, Petr ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
The deals of this bachelor's thesis are individual technologies of additive manufacturing and their use in the field of automotive production and development of automotive parts. As part of the work, five specific additive manufacturing methods with the greatest benefit to the automotive industry were selected. The technological procedures were described and characterized their essence, possibilities, pros and cons. The following is a detailed description of how the mentioned technologies are currently used in automotive production. The description is supplemented with examples of specific parts and projects where additive manufacturing was used. In conclusion, the possible future direction of the development of additive technologies is evaluated with the aim of expanding their use in automobile production. The thesis gains information mainly from foreign internet portals publishing articles in the field of the automotive industry or production technologies. The websites of 3D printer manufacturers and companies involved in the commercial use of additive manufacturing were also a quality source of information.
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Detection of infill defects in 3D printed structures using the DIC method
Doležal, Tomáš ; Halabuk, Dávid (referee) ; Ščerba, Bořek (advisor)
Additive manufacturing offers wide range of advantages. However various internal defects are likely to be formed during the manufacturing process which negatively affect mechanical properties. Detection of those defects is critical to ensure that the manufactured component stays reliable and maintains its dependability throughout its whole life. The potential of the digital image correlation (DIC) method for detect detection in components manufactured using additive technologies has not yet been investigated in the literature. In this master thesis a novel non-destructive defectoscopic method for the internal defect detection in 3D printed structures is presented, based on the evaluation of the strain field obtained by the DIC method. The method was experimentally evaluated on samples with artificial internal defects fabricated by FDM technology. The samples containing defects were successfully visually detected. A convolutional neural network was then used for the defect detection and achieved a classification accuracy of 94,5 %. This methodology has a potential to provide cheap and fast detection of internal defects formed in additive manufactured components in the future although future research is still required.
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Progresivní materiály v aditivní výrobě
Holan, Aleš
The bachelor thesis focuses on the additive technology of 3D printing. It presents a basic overview of material, individual production processes and prospective trends of utilization. The practial part consists of the process of producing a prototype component, including intial design, software editing and the process of printing. The final part evaluates the materials chosen for the specific prototype and presents the results of a chemical resistence test conduc-ted specifically for the needs of the component.
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