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Welding of aluminum alloys using high-power semiconductor laser
Mikeš, David ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
Thesis deals with the optimization of process parameters during laser welding of aluminum alloys 5000 series. The theoretical part describes the types of lasers and their applications in industry, further discusses the properties of aluminum alloys, laser welding theory and principles of monitoring and diagnostics of laser process. In the experimental part the samples were welded using a semiconductor laser. For those samples were evaluated mechanical properties, welded defects and structure depending on the process parameters. Using the photodetector was observed stability of laser process by sensing the plasma plume. The link between stability and the formation of structural defects in the weld joint was observed from the measurement results.
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Deep drilling of an aeronautical part
Klíma, Jan ; Humár, Anton (referee) ; Píška, Miroslav (advisor)
Diploma thesis deals with problems about deep drilling of aeronautical part made of aluminum alloy EN AW 7075 T7351. This work is focused on the material properties component and current aluminum alloys processing. Further it contains a part delicated to various kinds of technologies of deep drilling, primarily is focused to gun drilling. Describes a tool, technology and conditions in gun drilling of deep holes with focused to analysis of the forces. Then it compares contemporary manufacturing technology of part drilling in cooperation and proposes an innovative technology of manufacturing. This project is accomplished with technical-economical evaluation.
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Optimization of tool cutting geometry for high-speed machining of thin-walled parts
Barcuch, Jakub ; Humár, Anton (referee) ; Píška, Miroslav (advisor)
The theoretical part of the thesis deals with materials used in the aircraft industry with a focus on aluminium alloys. Then it describes high speed machining, its characteristics and its comparison with conventional machining. The following chapters describe strategies of machining thin-walled parts and a description of vibration that occurs during machining. The practical part deals with selection appropriate tool geometry, machining of thin-walled parts and evaluation of their deflection during machining.
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Coatings on aluminum alloys
Slouková, Karolína ; Wasserbauer, Jaromír (referee) ; Zmrzlý, Martin (advisor)
Aim of this bachelor thesis is a summary of results of research of conversion coatings on aluminum alloys and coatings based on examination of cerium using potentiodynamic measurements. In the theoretical section there are described basic properties of aluminum and its alloys. Then corrosion of aluminum and its alloys is discussed and an overview of the most common types of corrosion affecting these alloys is presented. A brief overview of aluminum alloys notation follows. Next section is devoted to concepts that are already associated with potentiodynamic measurements. There are described electrochemical cells, effects of current density, polarization and passivation. The following summary of research articles deal with current research of aluminum alloys and coatings formed on them. Discussed are especially research results on coatings based on cerium. The experimental part focuses on the effect of hydrogen peroxide concentration on coatings based on cerium, and the influence of the surface roughness of the samples on the adhesion of these coatings. Analyses were performed using electro microscopy and potentiodynamic measurements.
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Reduction of the body weight of passenger cars based on material choice
Petrucha, Roman ; Pernica, Vítězslav (referee) ; Šenberger, Jaroslav (advisor)
This bachelor thesis contains a description of the most commonly used materials and manufacturing technology for the body of cars. For this purpose, in the first chapter describes the vehicle body with the safety requirements that are placed on it. There are also analyzed the benefits of the overall reduction in vehicle weight. The following chapter describes the materials which are used for the construction of the body. The last chapter discusses the issue manufacture of bodies, where are analyzed some manufacturing technologies.
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High Speed Milling of Aluminum Alloys for Aircraft Industry
Pazdera, Lukáš ; Polzer, Aleš (referee) ; Píška, Miroslav (advisor)
The aim of this paper is a complex analysis of the high speed cutting in the aircraft industry. The paper studies especially the machining of aluminum alloys, which are characterized in the first part. We can find in next chapters a view on the high speed cutting from aspect of the chip formation, the force load and the machined surface roughness. The end of the paper is focused on the issues of the CNC, machining of typical aircraft shapes and description of roughing paths, which increase the productivity.
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The perspectives of hot bulk forming
Staněk, Vojtěch ; Císařová, Michaela (referee) ; Podaný, Kamil (advisor)
The project elaborated within bachelor study brings research work on the theme of perspectives of hot bulk forming. Forming technologies, their utilization so far, pertinence and supposed use in the future were reviewed on the basis of literary study. Further the importance of computer simulation and contemporary trends in processing of non-ferrous alloys are mentioned.
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