|
|
Optimization of macrostructure of nickel-based alloys castings
Šmíd, Michal ; Ňuksa, Petr (referee) ; Roučka, Jaromír (advisor)
This diploma thesis is focusing on possibilities of influencing casting’s structure of nickel superalloy Inconel 713LC by force effects caused by vibration and rotation during crystallization. In this research were cast three test castings of turbine wheels with different solidification conditions that have affected the size and distribution of the grains. The aim was to compare the different microstructure and macrostructure of castings and then compare the dependence of grain refinement on mechanical properties. Changes in the structure were analyzed by means of light and electron microscopy methods after the fracture of test bars.
|
|
|
3D printing methods for foundry applications
Rendek, Andrej ; Pernica, Vítězslav (referee) ; Krutiš, Vladimír (advisor)
The bachelor thesis is focused on the application of 3D printing methods for foundries, specifically for investment casting technology. The paper describes different printing methods and principles which they are based on with a more detailed description of materials containing their properties and in some cases recommended modifications of the casting process. The last part is devoted to price comparison of three selected methods of model printing for investment casting and dilatometry of six materials with evaluation of their coefficients of thermal expansion and glass transition temperatures.
|
|
| |
|
| |
|
|
Application of rapid prototyping in foundry industry
Krejčí, Zbyněk ; Macků, Martin (referee) ; Kosour, Vojtěch (advisor)
These bachelor thesis deals with the practical aplication of rapid prototyping at foundry industry. In the first part of the thesis is given list of the most important methods of rapid prototyping, those principles, advantages and disadvantages. And the second part is dealing with aplication of these methods at foundry industry, and its evaluation.
|
|
|
Influence of raw materials to the final quality of aluminium investment castings
Macko, Martin ; Vašťák, Patrik (referee) ; Horáček, Milan (advisor)
The purpose of this thesis is to assess the current state of production of ceramic shells in MESIT Foundry, a.s. and optimize it. The shells are evaluated in terms of their bending strength, gas permeability and microstructure. Subsequently, castings produced using the shells are evaluated with regard to number of non-conforming products and presence of defects. The final part seeks to compare different shells and outlines a possible new approach to the development of ceramic shells.
|
|
| |
|
| |
|
| |
|
|
Investment casting of TiAl alloys
Umshaus, Josef ; Malec, Silvestr (referee) ; Zemčík, Ladislav (advisor)
Intermetallic alloys gama TiAl are prospective materials of future thanks its excellent machanical qualities and low density. However this alloy clash with for wider expansion to the practice on burdensomeness production and processing. Among disavantages belongs to also her bad fluidity. The diploma work is angaged in possibilities imporing fluidity alloys TiAl by the help of centrifuge casting. Casting healthy casts was achieved in experimental part.
|
guest ::
