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Dimensional accuracy of Al castings manufactured by lost wax process
Kučera, Tomáš ; Vašťák, Patrik (referee) ; Horáček, Milan (advisor)
The aim of my diploma thesis was to find the possibilities of reaching the dimensional tolerance in the individual phases of casting by the investment casting process. The accuracy of the selected wax patterns and castings were measured by a caliper. At first the selected dimensions of the wax models were measured right after taking them out of the mold and then they were measured during seven days. The castings were measured after pouring. The obtained figures were statistically evaluated. The results show that the large-scale and thick-wall wax model should be coated after seven days of stabilization because the dimensions of the wax model are not stable.
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The Case
Svobodová, Hana ; Šrek Bromová, Veronika (referee) ; Gabriel, Michal (advisor)
I assume huddled topic that I put into my past work as well as in final work. Casting my body, which is covered with feathers and create a cocoon of him, husk without the interior. Sculpture has two sides, the principle of duality, femininity and counterpart. Outer packaging evokes pleasant birdlike body surface and in the inner part aggressively squeeze ends of the wicks feathers.
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Investment casting technology - overview of cast materials
Ostratický, Marek ; Mikulka, Vít (referee) ; Soukupová, Lucie (advisor)
The bachelor´s thesis deals with investment casting technology and overview of cast materials. In fist section deals with production. From the wax model, applying and curing the shell up to the actual casting and finishing operations. The second part is often drawn up a general overview of cast materials, which includes ferrous and non-ferrous metals. The aim is to develop research describing investment casting method with a general overview of cast materials. A summary of their properties and their use in practice.
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Technological Design for a Motorcycle Brake
Smílek, Lukáš ; Fiala, Zdeněk (referee) ; Kalivoda, Milan (advisor)
This thesis deals with the design of technological components for drum brake motorcycle. The introduction deals with the history of development of braking systems and their basic distribution.The documentation includes technological production process, the building of NC program in 3D design software and technical-economic evaluation.
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Heat treatment of steels
Rosecká, Eva ; Čech, Jan (referee) ; Šenberger, Jaroslav (advisor)
The Bachelor thesis deals with the questions of heat treatment of steels. The literature search explains the basic methods and principles of heat treatment of steels, the iron-carbon chart of equilibrium structure and the IRA and ARA charts of non-equilibrium structure. At-tention is also paid to the equipment for heat treatment of steels, and the principal mechanical properties that are used in the evaluation of steels are explained in brief. The experimental section contains the comparison of three creep-resisting steels in term of “as cast” condition, heat treated steel using operation procedures and laboratory-processed at up-per temperatures specified by the standard. These steels are mostly used in power industry at high temperatures. Their structure and mechanical properties were monitored at various phases of castings production. In conclusion, statistical evaluations and the comparison of those three materials are worked out within the scope of fifty heats.
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Surface casting defects
Rašek, Ondřej ; Pernica, Vítězslav (referee) ; Tomek, Ladislav (advisor)
Surface defects in casting include after decades of research on current problems of metal cast. They mean significant losses for foundries. Thesis includes a review of kinds of defects, their origins and their examinations, the effects on the mechanical properties and their machinability.
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Production of Ductile Iron with Feritic Matrix
Blaha, Marek ; Šupálek, Milan (referee) ; Molliková, Eva (advisor)
This bachelor thesis deals with the properties and production of ductile cast iron with ferritic matrix. Theoretical part is focused on basic information about ductile iron, its chemistry, structure and mechanical properties. The production of ductile iron with ferritic matrix in JMA Hodonín Ltd is described in the next chapter of this thesis. In the experimental part the real cast is described together with its production technology and material. The practical part is concentrated on comparison of chemical composition, structure and mechanical properties of material of cast and keel blocks made of the same melt. Finally the results of experiments are summarized and the arrangements for improving conformity between material of cast and of keel block are suggested.
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Investment casting - defects list
Šmatelka, Jakub ; Staňková, Markéta (referee) ; Mikulka, Vít (advisor)
This bachelor thesis deals with defects which can occurred during investment casting process. In the first part, there is briefly described investment casting process in Alucast s.r.o. company. List of all defects occurring during manufacture is described in the second part. This catalog includes majority of defects from the cast proposal to finishing operations. There are also described causes, consequences and corrective actions.
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