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Influence of filters on running of metal flow
Makalouš, Jakub ; Veverka, Aleš (referee) ; Roučka, Jaromír (advisor)
This study deals with influence of filters on running of aluminum metal flow. The main objective was to describe hydraulic resistances of assorted filters and running of silting filters by inclusions. Theoretical part generally describes filtration process and also filtration from the point of view of aluminum alloys and the most important characteristics of each type of alumina inclusions. Experimental part deals with flow rate tests, influence of filters on gassiness of melt and metallographic analysis. It was find out, that filter GEPHAL made minimal hydraulic resistance, on the other hand ceramic foam filters type LD made the maximal hydraulic resistance. It is necessary to reduce filtration surface for study running of silting filters by inclusions. Metallographic analysis showed amorphous alumina film inclusions, spinell Al2O3.2MgO, sludge and carbide of silicon.
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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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Reactivity and controll of properties of metallic materials
Kouba, Jan ; Richtera, Lukáš (referee) ; Zmrzlý, Martin (advisor)
This study deals with properties of aluminum alloys that are used in aerospace industry, particularly with alloy 2024. In introduction, the fundamental questions of metallurgy of aluminum alloys and their basic properties are summarized. Then the specific parameters of alloy 2024 are commented. It is followed by short summary of aluminum inorganic chemistry and chemistry of its compounds. Next chapter is an introduction to corrosion and description of its particular forms. The following section sets out a summary of results of recent research in the field of aluminum alloys corrosion, some details about corrosion product analysis and published results concerning hypochlorites, what is the key substance in experimental part. The experimental part is focused on the influence of temperature and concentration of sodium hypochlorite solution on corrosion of Al 2024, cladded by pure aluminum.
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Age forming of aluminium alloys
Stanislav, Filip ; Petrásek, Miloslav (referee) ; Klement, Josef (advisor)
The diploma thesis is focused on the description and the verification of a relatively young creep age forming method. This method is based on a relaxation of stress and a creep of material, which occur by forming a part in the clamping tool during the artificial precipitation heat treatment at elevated temperature. After removing from the tool, the spring back and the residual stresses in the part are smaller compared to the conventional forming methods. This is mainly reflected in the increased fatigue resistance of the structure. The creep aging is only applicable to the precipitation heat treatable alloys. This thesis is focused on aluminium alloys, which are typical for the aerospace industry. The first part of the thesis describes principles of technology, its use in the aviation and material processes in the aluminium precipitation heat treatable alloys during the creep age forming. In the second part, there is a methodology of the verification of technology on samples made of the aluminium alloys ČSN EN AL-P 7075 and ČSN 424203 (approximate equivalent of ČSN EN AL-P 2024). Furthermore, a forming tool is designed, and experiments are performed according to the proposed methodology. At the end of the thesis, the experiments are evaluated and changes in the spring back of the samples are compared for three different methods of forming: the conventional cold clamping forming, the creep age forming and the creep age forming with an overaging.
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Measurement of corrosion resistance of anodized aluminum protective surface layers
Redr, Martin ; Jandová, Kristýna (referee) ; Chladil, Ladislav (advisor)
This master’s thesis is focused on anodic oxidation of an aluminium surface with subsequent sealing of the surface using mid-temperature sealing methods. The research in the theoretical part of the thesis is carried out in surface treatments of aluminium and its alloys, where attention is mainly paid to anodic oxidation, as it is the most widely used surface treatment. The second discussed and at the same time key topic is the sealing process of the anodic coating, which has a fundamental effect on the quality of the corrosion resistance of the resulting surface. In the practical part of the thesis, a number of anodic oxidation experiments with subsequent sealing of the coating on prepared aluminium samples and their subsequent evaluation according to ČSN EN ISO 3210 standard were carried out. Mid-temperature sealing experiments were mainly focused on the use of triethanolamine (TEA), which seems very promising in terms of the resulting sealing quality.
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Study weld porosity aluminum alloy 5000 series during hybrid welding Laser-TIG
Drápela, Petr ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
This bachelor thesis is aimed on studying weld porosity of aluminium alloys made by laser-TIG technology. Theoretical part deals with welding methods and their parameters, capabilities and usage. Methods are investigated separately then as a unit. At the end of the theoretical part there is summary about welding aluminium alloys and their properties. In experimental part it is made eleven testing welds on sheet metal from aluminium alloy EN AW-5754 H111, thickness 5 mm. After this sizes of welds are measured. From these sizes dependences welding current to input heat Q are made. Final part concerns analysis of welding defects and final evaluation optimum welding parameters.
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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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Fatigue properties of EN-AW 7020 aluminium alloy
Kuběna, Martin ; Němec, Karel (referee) ; Věchet, Stanislav (advisor)
This bachelor thesis focuses on the fatigue properties of wrought aluminum alloy EN-AW 7020. The theoretical part deals with the properties and use of aluminum alloys and metal response to cyclic loading. The experimental section is concerned with the structure of alloy EN-AW 7020 and its mechanical properties, especially fatigue characteristics. The goal is to construct S-N curves in the high- and low-cycle region and determine the fatigue endurance limit at 10^8 cycles.
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ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS
Havlík, Petr ; Dřímal, Daniel (referee) ; Schwarz,, Drahomír (referee) ; Foret, Rudolf (advisor)
The problematics of weldability of heterogeneous welds of aluminium and titanium alloys produced by electron beam welding is discussed in this work. Homogenous welds of selected alloys were analyzed in the first stage. Welding of these materials relates to formation of intermetallic phases at the interface of base materials due to differences in physical, chemical and metallurgical properties of base materials. One of the prerequisites for producing high quality weld joints is to find optimal process parameters. The influence of selected process parameters to integrity, structure and mechanical properties of heterogeneous Al/Ti joints is evaluated.
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Robotic welding of hliníkových slitin
Pekárek, Mojmír ; Kočiš, Petr (referee) ; Vetiška, Jan (advisor)
This bachelor's thesis investigates robotic welding of aluminium alloys. It is divided into for parts, which are a summary of the findings of this problematic. The first part is focused on the robotics and the main distribution of industrial manipulators. The next part investigates about three possibilities of aluminium alloys welding at which two of them are focused on arch welding and the last one on the laser welding. In the third part is illustratively demonstrated the knowledge from previous parts on three various real cases to which is added also superstructure about process modification possibilities. At the end of the thesis is processed case study, which brings application of theoretic information in practice.
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