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Evaluation of mechanical and structural properties of new block
Lefner, Jiří ; Nová, Iva (referee) ; Čech, Jaroslav (advisor)
The purpose of this dilploma thesis is to evaluate mechanical and structural properties of two types casts of Al-alloy (components of the engine block) which were made by different technologies. Die casting with local squeeze casting and without local squeeze casting. First of them is used in lot manufacture of the current engine block. The aim of the foundry is to change the technology and start to produce new block by the die casting without local squeeze casting. The samples were taken from the both parts (lower and upper part) of the current and the new engine block which are made in foundry of Skoda Auto a.c. in Mladá Boleslav. Sets of mechanical and structural properties were selected, evaluated and tested by statistical programs. It was used fifty casts of the engine blocks for the experiment.
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Evaluation of porosity in Al-alloy die-castings
Klocová, Petra ; Nová, Iva (referee) ; Čech, Jaroslav (advisor)
The objective of this diploma thesis is an evaluation of die-castings porosity, eventually the evaluation of seats with local squeeze in connection with their mechanical and structural properties. The swatches of alloy AISi9Cu3 were taken from the engine block made by Škoda Auto Company, Mladá Boleslav. To the evaluation and the comparison of the results there were the other VUT FSI Brno students´ theses used.
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Al-alloy die-castings-trends in industrial
Rýdel, David ; Pacal, Bohumil (referee) ; Čech, Jaroslav (advisor)
The objective of this diploma thesis is to state the influence of porosity, DAS and shape factor on mechanical characteristics for the cast transmission cover made in Kovolit Modrice a.s.Which was molten from AlSi9Cu3. It was used an imaging software (Olympus Five) for classification of metallographical structures.
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Surface Modification of Zinc Alloys
Kinc, Marek ; Foral, Karel (referee) ; Molliková, Eva (advisor)
The object of this bachelor’s thesis is to create a research in field of zinc alloys. In the first part, there are outlined production of pure zinc with a different methods and briefly described the treatment of waste. The next are described the zinc alloys and their properties and outline the ways of die casting. The end of this thesis is focused on methods of finishing the surfaces.
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Optimization of diecasting process of an electric motor bear shield casting
Krňávek, Štěpán ; Kolmačka, Marek (referee) ; Roučka, Jaromír (advisor)
The present bachelor thesis deals with optimization of a die casting technology used to make a casting of an electric motor bear shield which is cast in the Siemens Elektromotory Ltd. foundry in the town of Mohelnice. There are foundry defects in the casting which are undesirable and must be removed. The introduction of the thesis is devoted to an analysis of the bear shield casting, its casting parameters, an alloy AlSi9Cu3(Fe) used and to problems resulting from the occurrence of defects in the casting. Subsequently, the die casting technology is explained, machines used in this technology and their new structural design are described, and the most frequently occurring defects in this technology and their causes are mentioned. In the following part of the thesis an x-ray analysis of the casting, a thermal analysis of the casting and a microscopic analysis of the defect cavity are carried out. On the basis of the analysis the casting defects have been identified as closed air - gas holes. To minimise the occurrence of the given casting defects several possible corrective measures have been suggested.
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Study of the main factors affecting quality in technological processes
Talanda, Ivan ; Nová, Iva (referee) ; Čech, Jaroslav (advisor)
The aim of this bachelor’s thesis is to theoretically describe porosity problems of casts of aluminium alloys that are made via die casting technology. The thesis is focused on influence of porosity on mechanical properties of casts. Theoretical dependencies were verified in experiment, which is based on new measured data and data witch were taken from diploma theses and science articles written by other students of the University of Technology in Brno. The samples used in experiment come from engine blocks, which were made by technology of die casting or die casting with local squeeze casting.
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Al-alloy die-castings for automotive industry
Havel, Jiří ; Nová, Iva (referee) ; Čech, Jaroslav (advisor)
This search is concentrated on Pressure-castings of aluminum alloys for the automotive industry. In the theoretical part of this topic is described in terms of technology for casting aluminum alloys with a focus on high-pressure casting of aluminum alloy AlSi9Cu3 and methods of detecting residual stress. In the experimental section is a sample of residual stress measurements on samples cast alloy AlSi9Cu3.
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Structure and Properties of Selected Magnesium Cast Alloys
Svozil, Libor ; Pacal, Bohumil (referee) ; Podrábský, Tomáš (advisor)
Microstructure and mechanical properties of AZ91 magnesium alloy after die cast (casting under pressure) and squeeze casting were comparated. The compare of incident phases, their microhardness, gas bubbles in the alloy, hardness and other mechanical properties of alloy are included in this work. For compare has been used a light microscopy, tensile test, hardness and microhardness measurements, image analysis and scaning electron microscopy.
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Pressure die casting technology with a focus on specific technologies used in the foundry Motor Jikov
VOCILKA, Michal
This bachelor thesis is aimed on the process of pressure die casting. The manufacture of that is described in the first part of my thesis. Then there is description of manufacture of a particular part. The thesis is based on expertise of many employees working in Motor Jikov for many years. The text is filled with schematic pictures, photos and graphs. In the next part there is given detailed methodology for treatment of technological process of die casting. The text has been written as well-aranged and methodologically-specific unit to be well-used for teaching.
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