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Processing of aluminium alloys using 3D technology selective laser melting
Měchura, Lukáš ; Koutný, Daniel (referee) ; Paloušek, David (advisor)
This bachelor thesis deals with finding of appropriate process parameters for minimizing porosity with SLM technology for processing aluminum alloy 6061. The search part deals about the issue of additive manufacturing aluminum alloys and evaluation of porosity measurements of relative density. Based on general knowledge were proposed test samples produced by sintering of metallurgical powder using a laser with ytterbium optical fiber. In this work was used high power of laser up to 400 W, with which 6061 alloy was not been in terms of porosity in detail tested yet. As the result, the technological parameters dependence on relative density and the overview of this alloy processing by SLM technology was determined.
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Research on process parameters for producing of a structured material made by Selective Laser Melting technology
Richter, Vladislav ; Koutný, Daniel (referee) ; Vrána, Radek (advisor)
Selective laser melting (SLM) is one of additive technologies which allows manufacturing of components with very complex shape. One of the examples are porous lattice structures which are used in cosmonautics or medicine due to its good mechanical properties and low weight. In this work the influence of processing conditions (laser power and laser scanning speed) on material properties and geometry of as-fabricated trusses is investigated. Wide range of laser powers (100–400 W) and laser scanning speeds (1000–10000 mm/s) were used to determine optimum process parameters. Truss size, morphology and internal porosity was investigated using optical 3D scanner and X-ray micro computer tomography (mCT). Based on executed measurements optimum processing conditions were determined to be 350 W and 3000 mm/s. It is possible to manufacture faster geometrically more precise structures with equal internal porosity due to optimization.
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THE USE OF 3D TECHNOLOGY IN THE PUBLIC SPACE
Šebánek, Jan ; Medek, Tomáš (referee) ; Kristek,, Jan (referee) ; Sobotka, Jiří (referee) ; Gabriel, Michal (advisor)
The aim of this thesis is to define the impact of rapid prototyping technology in terms of creative potential to use this technology represents a particularly sculpture and architecture. Rapid Prototyping is a generic term covering a range of technologies: 3D scan converting the already realistic three-dimensional objects in computer memory, parametric modeling, which creates three-dimensional objects based on the formative algorithms, photogrammetry method of compiling three-dimensional object from a photo, technology, 3D printing materializing after each layer objects transferred from the computer's memory. When processing the theoretical work will be explored and discussed possibilities for realization of basic three-dimensional objects using 3D technology. The second step will be to map the different methods of access to artists working with 3D technology. In the end it tried to evaluate the benefits of these technologies in the field of sculpture and architecture in terms of traditional approaches. This paper attempts to describe the possible implications and potential of this progressive field in the classical artistic disciplines such as sculpture and architecture, both in terms of benefits and in terms of the eventual negative impact with respect to increasing the availability of this technology.
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Processing of alloy 2618 using selective laser melting technology
Dokoupil, Filip ; Hutař, Pavel (referee) ; Paloušek, David (advisor)
This diploma thesis deals with finding and verification of appropriate technological parameters of SLM technology for the processing of aluminum alloy 2618. In the theoretical part, an introduction to additive manufacturing of aluminum alloys and general description of processes occurring during SLM production is given. Based on general knowledge were designed different types of testing samples produced by sintering the metallurgical powder using 400 W ytterbium fiber laser, which so far in the literature for aluminum alloy 2618 were not described. As the result, the technological parameters dependence on relative density and the detailed overview of the 2618 alloy processing by SLM technology is determined.
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Geometric Accuracy of Additively Manufactured Test Parts
Ilčík, Jindřich ; Sehnoutka, Petr (referee) ; Koutný, Daniel (advisor)
The presented diploma thesis deals with the control of the geometric accuracy of the parts produced by additive manufacturing technology selective laser melting. The paper first analyzed the work of the other authors dealing with this issue. Based on obtained informations from this analysis were developed benchmark test parts for quality control of production on a commercial machine SLM 280 HL supplied by SLM Solutions GmbH. The work was carried out several tests to determine the appropriate parameters of construction parts. These tests, their results and conclusions are fully described in this papper.
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Design of Stirling Engine Operating at Low Temperature Difference
Gavač, Adam ; Kolář, Ladislav (referee) ; Sedlák, Josef (advisor)
The aim of this study is to acquaint the reader with the Stirling engine, which is one of the possible alternatives to generally known combustion engine. The theoretical part has three major purposes: First is to describe thermodynamics of the Stirling cycle in the range that is essential for comprehension of the engine`s operating principle. Second is to mathematicaly derivate expression for the efficiency of the ideal Stirling cycle. Third is to discuss each of the essential parts of the device. Concepts acquired in the theoretical part were employed to design a digital model in the parametric modeler Autodesk Inventor. Parts were manufactured by a combination of typical and progressive technologies. Engine was assembled and tested afterwards.
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3D printers
Göbel, Lukáš ; Synek, Miloš (referee) ; Pavlík, Josef (advisor)
Bachelor's thesis is divided into two parts. The first part deals with the general use of 3D printers in the industry, describes the pre-processing and post-processing operations and used materials. The second part is concentrated on the construction solution and describes each principle of the 3D printing machines, including their advantages, disadvantages and applications. Also some selected common printing technologies are mentioned with examples of their parameters and used materials.
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Actual trends in manufacturing of permanent patterns
Procházka, Michal ; Bouška, Ondřej (referee) ; Horáček, Milan (advisor)
This bachelor thesis deals with the more detailed description of various methods employed for the manufacturing of permanent patterns which are used for making of nonpermanent moulds. According to the type of materials the models are divided into the wooden, the metallic, the plastic and the models made from the resin. The work covers the description of handmade manufacturing which is performed either manually (generally in case of wooden models) or by conventional methods of machining. It also includes the CNC machining mostly used for the manufacture of larger models. Further, certain methods Rapid prototyping are described here but these methods are restricted in sizes of future model, as they are used for the models of smaller measurements. Finally, the newer methods including the methods of Additive manufacturing are also described in the work.
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Fluid mechanics of additive manufacturing of metal objects by accretion of droplets – a survey
Tesař, Václav
Paper presents a survey of principles of additive manufacturing of metal objects by accretion of molten metal droplets, focusing on fluid-mechanical problems that deserve being investigated. The main problem is slowness of manufacturing due to necessarily small size of added droplets. Increase of droplet repetition rate calls for basic research of the phenomena that take place inside and around the droplets: ballistics of their flight, internal flowfield with heat and mass transfer, oscillation of surfaces, and the ways to elimination of satellite droplets.
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