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Design of special extruder for 3D printing
Maňák, Juraj ; Vetiška, Jan (referee) ; Pavlík, Jan (advisor)
The bachelor thesis focuses on the design of a print head for 3D printing of cement mixtures. The work discusses current 3D concrete printing technologies, concrete transport options, and the properties of concrete mixes and admixtures. Next, three conceptual printhead solutions and two shaft bearings are proposed. Using multi-criteria analysis, the resulting variant is selected and it is structurally processed. The designed printhead allows continuous printing and mixing of the cement mixture and admixture of the setting accelerator.
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The study of the effect of additive manufacturing technology parameters Selective Laser Melting properties of the produced object
Žabka, Marek ; Koukal, Ondřej (referee) ; Vrána, Radek (advisor)
Metal additive technology currently finds use in a large number of industrial sectors. Mainly in domains such as aviation, medicine and astronautics, the emphasis is laid on mechanical and material properties of materials. This bachelor thesis deals with the research study of process parameters of technology Selective Laser Melting for material AlSi10Mg and stainless steel 316L. In thesis the impact analysis of main process parameters: laser power, scanning speed, hatch distance, layer thickness, especially on the porosity of the samples was carried out. Recommended settings for both materials were found based on the research of the current state. It was further found out the influence of parameters such as powder humidity or laser scan strategy.
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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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Development of materials for 3D printing of elements meeting the requirements of transport structures
Romanová, Dorota ; Melichar, Jindřich (referee) ; Žižková, Nikol (advisor)
This bachelor thesis deals with the use of supplementary cementitious materials as a partial replacement of Portland cement in cement composites, focusing on the requirements of transport constructions. The theoretical part consists of a description of the input raw materials as well as cement substitutes, the studied properties of the 3D printed mixtures and a description of the characteristics of the technology. The practical part is focused on the experimental testing of the selected properties with monitoring of the influence of polymer and bio-polymer additive dosage in the proposed formulations and subsequent analysis of the most convenient one for 3D printing.
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Design of special extruder for 3D printing
Maňák, Juraj ; Vetiška, Jan (referee) ; Pavlík, Jan (advisor)
The bachelor thesis focuses on the design of a print head for 3D printing of cement mixtures. The work discusses current 3D concrete printing technologies, concrete transport options, and the properties of concrete mixes and admixtures. Next, three conceptual printhead solutions and two shaft bearings are proposed. Using multi-criteria analysis, the resulting variant is selected and it is structurally processed. The designed printhead allows continuous printing and mixing of the cement mixture and admixture of the setting accelerator.
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The study of the effect of additive manufacturing technology parameters Selective Laser Melting properties of the produced object
Žabka, Marek ; Koukal, Ondřej (referee) ; Vrána, Radek (advisor)
Metal additive technology currently finds use in a large number of industrial sectors. Mainly in domains such as aviation, medicine and astronautics, the emphasis is laid on mechanical and material properties of materials. This bachelor thesis deals with the research study of process parameters of technology Selective Laser Melting for material AlSi10Mg and stainless steel 316L. In thesis the impact analysis of main process parameters: laser power, scanning speed, hatch distance, layer thickness, especially on the porosity of the samples was carried out. Recommended settings for both materials were found based on the research of the current state. It was further found out the influence of parameters such as powder humidity or laser scan strategy.
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The study of the effect of additive manufacturing technology parameters Selective Laser Melting properties of the produced object
Žabka, Marek ; Koukal, Ondřej (referee) ; Vrána, Radek (advisor)
Metal additive technology currently finds use in a large number of industrial sectors. Mainly in domains such as aviation, medicine and astronautics, the emphasis is laid on mechanical and material properties of materials. This bachelor thesis deals with the research study of process parameters of technology Selective Laser Melting for material AlSi10Mg and stainless steel 316L. In thesis the impact analysis of main process parameters: laser power, scanning speed, hatch distance, layer thickness, especially on the porosity of the samples was carried out. Recommended settings for both materials were found based on the research of the current state. It was further found out the influence of parameters such as powder humidity or laser scan strategy.
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