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Production of castings using Rapid prototyping
Baránek, Martin ; Myška, Martin (referee) ; Bořil, Petr (advisor)
The work is focused on the production of a decorated stand casting using rapid prototyping and reverse engineering methods. The thesis first performs a literature search dealing with selected additive technologies usable for the production of foundry patterns or molds. Subsequently, the work describes the basics of 3D scanning technology. The experimental part of the thesis describes the production process of castings. The original was first digitized using a hand-held scanner, the obtained data were modified as needed and served as an input for 3D printing of permanent foundry patterns. Their production took place on a FDM 3D printer PRUSA MK3S and they were made of PLA material. The models were then formed into sand molds. The resulting castings were made of grey cast iron.
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Insulating materials in foundry technology
Slowiaczek, Kamil ; Krutiš, Vladimír (referee) ; Myška, Martin (advisor)
The thesis deals with materials that ensure the insulation of foundry furnaces and ladles. The first part discusses the properties that most affect the insulation capacity. The second chapter focuses on the overview and characteristics of refractory materials. In the next part of the thesis, the most used insulation materials are named and approached. Finally, the thesis deals with the composition of the lining of the electric arc furnace, ladles and the rammed lining of the induction crucible furnace.
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Micropurity of steel manufactured in vacuum induction furnaces
Hořínek, Jakub ; Myška, Martin (referee) ; Záděra, Antonín (advisor)
During the production of steel, a certain proportion of non-metallic inclusions always arises, which significantly affects its final properties. The theoretical part of this thesis focuses on the effects of these impurities on the properties of steel and on ways to reduce their total content in steel. In the experimental part, the effect of vacuum melting, with casting in air, on the final micropurity of stainless steel was investigated. The results showed that the vacuum method was very effective as there was a significant reduction of the oxide inclusions content and oxygen content in the steel. Then, a part of the material from the first melting was remelted and the effect of repeated vacuum remelting of the material with casting in vacuum was investigated. The analysis showed a significant reduction in nitrogen content but the oxygen content remained almost the same.
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Production of lever fuse casting for hose coupling
Tvrdoň, Tomáš ; Myška, Martin (referee) ; Pernica, Vítězslav (advisor)
The first part of this bachelor’s thesis is just a theory and it is focused on producing castings with method of impermanent moulds. You can find here basic classification of moulds and afterwards sand moulds and ceramic moulds are described. The second part is practical and it is focused on a production of lever fuse which defends disconnection of the fire hose when it is under the pressure of water. Lost wax casting was chosen for the production. In this part is described full process from pattern making, gluing to wax tree, covering to metal casting. The whole practical part is accompanied by authentic pictures which were made during the process.
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Lining of the induction furnaces
Kopečný, Vendelín ; Pernica, Vítězslav (referee) ; Myška, Martin (advisor)
This work deals with lining of electric induction furnaces. The first part describes the preparation of lining, its function during the running of furnace and also its tearing down at the end of work process. In the thesis is also discussed the use of rammed crucibles. The materials used for lining and rammed crucibles are described also in the sense of their chemical properties in connection with the possibilities of their use under different conditions. The practical part of the thesis describes the process of lining the electric induction furnace, which was realized by the author under the supervision of the supervisor.
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Manufacture of cylinder head casting for engine renovation Jawa 50
Pastyřík, Petr ; Myška, Martin (referee) ; Bořil, Petr (advisor)
This project elaborats the manufacture of a cylinder head casting for an engine renovation of Jawa 50. Based on the literary pursuit of suitable foundry technologies and using 3D printing in foundry a casting production technology was designed and the cylinder head was made. The part was designed in the CAD software and then printed on a 3D printer. The printed model was formed in ceramic shell form, then melted and the form was annealed. After that the cast was casted. The last operations were fettling and finishing machining.
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Making of movie figurine replica
Petřík, Michal ; Myška, Martin (referee) ; Janský, Vojtěch (advisor)
This thesis is focused on an overview of artistic casting in a form of chronological order of individual epochs in the mankind’s arts, in which artistic casting had occurred. Furthermore, a brief overview of materials used the most in artistic casting is added to this thesis. Practical part of this thesis is dedicated to various ways of production of a movie figurine replica based on a copy of children’s toy.
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Manufacture and properties of heat resistant alloys
Majchrák, Aleš ; Myška, Martin (referee) ; Záděra, Antonín (advisor)
This bachelor thesis deals with heat resistant alloys, specifically with superalloys and high entropy alloys. The theoretical part includes distribution of those alloys by their chemical composition, description of their properties, microstructure and applications. Experimental part is devoted to cobalt alloy UmCo50. Aims of this part include metallurgy process description of this alloy, verification of vacuuming time influence on decarburization, microstructure observation and its conclusion.
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Production, structure, mechanical properties and usage of martensitic stainless steels
Zíka, Marek ; Myška, Martin (referee) ; Blažík, Petr (advisor)
This bachelor thesis deals with issues of production, mechanical properties and structure of martensitic stainless steels. Further a thesis is focused on heat treatment, which significantly improves mechanical properties of steels, and usage of this materials. In experimental part is solved influence of chromite sand on surface structure cast. On the images of structure of casting samples can be seen, that the chromite doesn’t have influence on surface structure.
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Furnaces for heat treatment of metals
Pražan, Jan ; Myška, Martin (referee) ; Záděra, Antonín (advisor)
The bachelor thesis focuses on construction of furnaces for heat treatment of metal. The classification and description of heat treatment of steel, cast iron, non-iron metal and their alloys was based on literature review. The description of the key ways of temperature transfer is provided: by conduction, convection, and radiation. The furnace type’s distinction was created according to the types of construction, heat treatment, and its purpose. The main focus was on chamber furnaces construction and their use. In addition the performance calculation, insulation types overview, ways of heating, temperature distribution, and also heat measurement, and regulation needed for treatment are presented. The thesis provides also assessment of advantages and disadvantages of insulation types and selected ways of heating (i.e. flame and resistance heat sources).
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