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Optimizing the ceramic tree mould taking into account the robotic shelling system
Petřík, Michal ; Šmatelka, František (referee) ; Horáček, Milan (advisor)
This diploma thesis deals with the optimization of the design pattern assembly for robot shell making system. Six types of castings were selected for optimization in regard to increase the utilization of liquid metal. The individual castings are described in the chapters and in the subchapters are described the original design pattern assembly intended for manual shell making, the designed pattern assembly shell making system with subsequent evaluation for the use of molten metal yield. The following chapters described the benefits of changing the pattern assembly design, the defects caused by this change and recommendations that should rule out the possible occurrence of these defects. The last chapter deals with a modified plate weight test, which was created directly for the conditions of the company Alucast s.r.o., where the practical part was solved.
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Modification of ceramic shells to increase its break up after casting process
Škriečková, Natália ; Horáček, Milan (referee) ; Krutiš, Vladimír (advisor)
This master´s thesis deals with the problem of the disintegration of shell moulds after casting. Too high residual strength increases the cost of operations associated with the final cleaning of castings. The aim was to analyze the current state of the art and to optimize the production of moulds in MoraviaTech a.s. so that the removal of the ceramic shell after casting is easier. In the first part, a literature analysis of the influences that could have a positive effect on the speed of shell removal is made. In the practical part, experiments are conducted comparing the amount of shell removed as a function of time between modified ceramic shells and shells produced by the company. In the last part, the results of the individual measurements are evaluated and conclusions and recommendations for MoraviaTech a.s. are drawn from them.
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Optimization of gating systems (their yield) in Al castings made by investment casting technology
Žižka, Jiří ; Šmatelka, František (referee) ; Horáček, Milan (advisor)
This diploma thesis deals with the optimization of gating systems of shape-complex aluminum castings produced by investment casting process. Two castings whose massive gating systems make problem with the use of liquid metal (so called yield) were chosen for optimization. Each casting is described in its own chapter. The individual subchapters deal with description of the original and newly designed gating system. Simulation, test castings, X-ray inspection and metallographic examination were performed for each variant. At the end of each chapter there is an evaluation of the results of the optimization of gating system.
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"Optimizing the Al casting heat treatment"
Ostrézí, Barbora ; Cileček, Jarmil (referee) ; Horáček, Milan (advisor)
This master’s thesis focuses on the heat treatment of the aluminium alloy AlSi7Mg0,6 and also investigates the effects of different coolants usage on its mechanical properties. First part is dedicated to the description of aluminium alloys, their chemical composition, behaviour and mechanical properties with particular attention to the Al-Si-Mg alloys. This part was followed by the summary of commonly used heat treatment of aluminium alloys. The third part is dedicated to the experiment. Castings and test specimens were wax casted at Alucast, s.r.o. company. After annealing, the samples were quickly cooled down in four different coolants and underwent tensile testing. Their mechanical properties (tensile strength, yield point and ductility) were evaluated as well as microstructure. In the last part, the achieved results are presented.
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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.
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Possibilities of using numerical simulations in investment casting technology
Čagánek, Radim ; Cileček, Jarmil (referee) ; Horáček, Milan (advisor)
The diploma thesis deals with the possibilities of using numerical simulation in investment casting technology. The first chapter of practical part deals with the use of simulations in the design of gating system for the shape-complex casting. At the same time, the practical part verified the accuracy of the simulation by test castings on which the X- ray inspection was performed. The results showed that the occurrence of internal defects predicted by simulation corresponded to the locations in the test casts. Next part of the thesis describes improvement of the use of liquid metal (so called “yield”) by numerical simulations. Two specific castings were chosen to perform simulation of current and newly designed variant of the gating system.
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Development of ceramic shell for manufacturing of large Al investment castings
Hýbal, Ondřej ; Šmatelka, Jakub (referee) ; Horáček, Milan (advisor)
This diploma thesis deals with the choice of the most suitable composition of a ceramic shell mold for aluminum castings made by investment casting technology. The most suitable composition of the ceramic shells is chosen based on the results of the tests and from economic point of view. This thesis also deals with evaluation of the current conditions of the production of ceramic shells in Alucast, s.r.o and recommendations for stabilizing the process of manufacturing ceramic shell molds.
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