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Production of thinwall iron castings
Kryštůfek, Tomáš ; Kaňa, Václav (referee) ; Roučka, Jaromír (advisor)
This diploma thesis is focused on production and problems in production of thin-walled ductile iron castings, especially in the inoculation process. The focus is on the influence of elements on the structure and mechanical properties of ductile iron and as well as the influence of some elements, that are commonly used in inoculation alloys. Furthermore, the factors that affect the production technology are written, i.e., solidification rate, wall thickness, cooling rate, and factors used for affecting the thin-walled castings production, i.e., the use of insulating moulding compounds and increasing the graphite nodule count. At the end of the theoretical part, important production processes are analysed, namely inoculation and spheroidization. The experimental part is focused on influencing the structure and mechanical properties using several types of inoculants of different chemical compositions, whereas the tested thicknesses of the test plates are 3-, 5- and 8-mm. Hardness, tensile strength and ductility are evaluated on these plates. Finally, the volume of ferrite in the structure, shape and size of the graphite nodules were examined.
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Production and properties of advanced Cu-based alloys castings
Kryštůfek, Tomáš ; Pernica, Vítězslav (referee) ; Kaňa, Václav (advisor)
This bachelor thesis is focused on well-arranged processing of production copper alloy castings. Following a brief historical introduction, a process of producing crude copper is first developed. Attention is paid to the sources of copper in nature and the subsequent melting of copper in furnace and converter. Furthermore, the technology of melting copper alloys is elaborated meaning melting devices, melting gases, melting directions and deoxidation. Very high purity copper can be produced by refining the crude copper in an electrolyte or by electroslag remelting and melted according to three technological processes. There are finally elaborated the processes of melting, properties and use of bronze and brass in detail - foundry copper alloys.
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Production of thinwall iron castings
Kryštůfek, Tomáš ; Kaňa, Václav (referee) ; Roučka, Jaromír (advisor)
This diploma thesis is focused on production and problems in production of thin-walled ductile iron castings, especially in the inoculation process. The focus is on the influence of elements on the structure and mechanical properties of ductile iron and as well as the influence of some elements, that are commonly used in inoculation alloys. Furthermore, the factors that affect the production technology are written, i.e., solidification rate, wall thickness, cooling rate, and factors used for affecting the thin-walled castings production, i.e., the use of insulating moulding compounds and increasing the graphite nodule count. At the end of the theoretical part, important production processes are analysed, namely inoculation and spheroidization. The experimental part is focused on influencing the structure and mechanical properties using several types of inoculants of different chemical compositions, whereas the tested thicknesses of the test plates are 3-, 5- and 8-mm. Hardness, tensile strength and ductility are evaluated on these plates. Finally, the volume of ferrite in the structure, shape and size of the graphite nodules were examined.
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Production and properties of advanced Cu-based alloys castings
Kryštůfek, Tomáš ; Pernica, Vítězslav (referee) ; Kaňa, Václav (advisor)
This bachelor thesis is focused on well-arranged processing of production copper alloy castings. Following a brief historical introduction, a process of producing crude copper is first developed. Attention is paid to the sources of copper in nature and the subsequent melting of copper in furnace and converter. Furthermore, the technology of melting copper alloys is elaborated meaning melting devices, melting gases, melting directions and deoxidation. Very high purity copper can be produced by refining the crude copper in an electrolyte or by electroslag remelting and melted according to three technological processes. There are finally elaborated the processes of melting, properties and use of bronze and brass in detail - foundry copper alloys.
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