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The impact of metal powder recycling on the porosity of parts produced by Selective Laser Melting
Sůkal, Jan ; Hudák, Radovan (referee) ; Paloušek, David (advisor)
Diploma thesis deals with the influence of recycling of powder steel 1.2709 on porosity of parts processed by SLM technology. Theoretical part of this thesis gives an overview of the influence of selected process parameters of this additive technology on the porosity of manufactured parts. The presence of pores in the material is the main cause of worse mechanical properties compared to conventionally manufactured materials. Since the advantage of this technology is the possibility of wasteless production, one of the possible causes of pore formation and degradation of properties of the powder material is due to standard recycling by means of sieving to remove the contaminants generated during the construction. This paper compares the porosity of parts produced by two different machines, analyzes the possible consequences of sieving on powder properties, establishes recommendations for setting the recycling process, and compares the degree of influence of process parameters on porosity.
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Processing of high-strength aluminum alloy AlSi9Cu3 using selective laser melting technology
Suchý, Jan ; Hutař, Pavel (referee) ; Paloušek, David (advisor)
Method selective laser melting can produce metal parts by using 3D printing. This diploma thesis deals with the influence of process parameters on the workability of AlSi9Cu3 high-strength aluminum alloy using selective laser melting. The theoretical part deals with relations between process parameters and identifies phenomena occurring during the processing of metals by this technology. It also deals with conventionally manufactured aluminum alloy AlSi9Cu3. In the work, material research is performed from single tracks tests, porosity tests with different process parameters and mechanical testing. Here are showing the trends of porosity change at scanning speed, laser power, individual laser stop distance, bulk energy, and powder quality. The workability of the material can be judged by the degree of relative density achieved. Simultaneously the values of the achieved mechanical properties of the selected process parameters are presented. The data obtained are analyzed and compared with literature.
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Modern methods of implant manufacturing by Rapid Prototyping technology
Trubačová, Pavlína ; Sedlák, Josef (referee) ; Píška, Miroslav (advisor)
This research describes the possibilities of using unconventional technologies known as Rapid Prototyping methods. These methods make part of Additive manufacturing technologies. The project investigates the influences of process parameters on the final part quality and analyses the advantages and the disadvantages of using RP technologies for medical application, mainly for implant fabrication. The objective of experimental part is fabrication of samples by Selective Laser Melting (RP technology). The stainless steel will be used and two parameters will be varied (laser power, component inclination). For final evaluation of mechanical properties, surface quality, Alicona machine, compression test and Vickers’ hardness test will be used.
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Design of injection molding cooling insert for manufacturing by Selective Laser Melting
Tekeľ, Richard Martin ; Vrána, Radek (referee) ; Koutný, Daniel (advisor)
This bachelor thesis focus on design of a cooling insert so the current mold cycle time will be reduced and it will be possible to manufacture the insert by SLM. Proposed modification includes 1 cooling line with non-circular cross section and disrupt empiric cooling line design recommendations. A research into differences of conventional and additive manufacturing of injection moulding inserts was conducted as well as into theoretical principles needed for a design of cooling lines and preview of similar solutions for the given task. After simulation of current state and obtaining a value of current cycle time, 3 different designs of cooling line were chosen and simulated in order to pick the most suitable one. This cooling design was afterwards modified to get conformal shape and lower distance from critical spot. The last part of thesis interpret the results from simulation of the final cooling line design and estimation of safety against fatigue failure.
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Development of process parameters of Selective laser melting technology for the production of thin-walled iron parts
Šreibr, Vít ; Dočekalová, Kateřina (referee) ; Paloušek, David (advisor)
The thesis deals with the processing of pure iron by Selective laser melting technology as a material with good electromagnetic properties. The main area is the optimization of the production of thin-walled samples, which monitor the influence of process parameters on the thickness and quality of the wall surfaces. In addition to the perpendicular walls, walls built at an angle of 45° are also examined. Another phase of the thesis is the determination of process parameters for bulk bodies to achieve the lowest porosity and high surface quality. An important part of the research is the application of acquired knowledge in the production of samples designed to test magnetic properties as well as part for a specific application. These considerations concern not only the setting of the printing parameters, but also the heat treatment and its influence on the magnetic and mechanical properties of the material. Mechanical properties were determined by tensile tests and hardness tests. All samples were made on a SLM 280HL using a 400W ytterbium laser.
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Modern trends of production Al-based castings
Kovář, Jan ; Kaňa, Václav (referee) ; Krutiš, Vladimír (advisor)
This bachelor thesis is a recherche discussing new methods of the production al-alloy castings, which are mainly developed for the needs of automotive and airspace industry. The described methods are semi-solid casting and metal-matrix composites as the approaches of slurry production and squeeze casting and V-process as the approaches of casting. Further are described SLS, SLM and MJF methods of rapid prototyping and the structure of SLMed AlSi9Cu3 alloy is observed.
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Manipulator design for transport of SLM technology platforms
Železník, Tomáš ; Malý, Martin (referee) ; Koutný, Daniel (advisor)
The aim of the thesis is to design a manipulator for platforms from the machine SLM 280 HL, which is used in the laboratory of the Institude of Design. The manipulator will be used for transportation the platforms with a part from the machine into the tempering furnance. At the same time, the manipulator ensures safe removal of the platform from the machine so the machine and the part are not damaged. A special tool mounted on the platform is used for removing it. Thesis includes computational verification of dangerous places on the construction, manipulator stability and costs.
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Processing of high-strength aluminum alloy EN AW 7075 using SLM technology
Skalický, Petr ; Hudák, Radovan (referee) ; Koutný, Daniel (advisor)
This diploma thesis deals with processing of high strength aluminum alloy EN AW 7075 by Selective Laser Melting and verify the influence of process parameters on relative density and mechanical properties. The theoretical part contains an introduction to additive manufacturing of aluminum alloys, the influence of process parameters and description of processes occuring during SLM production. Based on the theoretical part were prepared experiments and method of evaluation. Samples were produced by melting metallurgical powder using ytterbium laser with a maximum output power of 400 W. This diploma thesis also describes the formation and growth of cracks inside the material, which so far in the literature for alloy EN AW 7075 were not described. As the result, the process parameters dependence on the relative density and an overview of this aluminum alloy processing by SLM technology is determined.
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Processing of magnesium alloys using selective laser melting
Kaščák, Pavol ; Paloušek, David (referee) ; Suchý, Jan (advisor)
The processing of magnesium-based materials with Selective laser melting technology is due to its high reactivity in the initial stages of development. This bachelor thesis deals with the elucidation of impacts of individual process parameters in processing of magnesium alloys on the resulting material porosity. The aim is to develop initial experiments for the shift in the processing of magnesium alloys by additive technologies. The theoretical part contains an insight into the SLM technology and an overview of the current state of knowledge of processing of magnesium alloys by this technology. By the analysis of the theoretical part, the main volume test of this thesis has been designed. The selected material for this test was the biodegradable magnesium alloy WE43. According to the author's knowledge, no research has been published on this alloy so far. Based on the results of the experiment, the dependencies of the individual process parameters were made on the resulting relative density of the samples. At the end, the outputs were compared with the literature.
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Design for production of analog watch case
Vilímovský, Daniel ; Kouřil, Karel (referee) ; Sedlák, Josef (advisor)
The aim of this bachelor thesis is a brief introduction to the watch industry and the characteristics of Rapid Prototyping. The practical part is focused on creating models of individual watch components in 3D parametric program Autodesk Inventor and following production by various methods on 3D printer. Part of the thesis is also assembly, including the watch movement installation. The thesis is concluded with a technical-economic evaluation and comparison with currently used production methods.
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