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Using simulation to predict defects in and evaluate properties of die-cast Al-alloy castings
Morávková, Jitka ; Nová, Iva (referee) ; Čech, Jaroslav (advisor)
The purpose of this diploma thesis is comparing the quantity of porosity in die-cast aluminium casting with using simulation. The cast engine blocks were made by high pressure die-casting and a local squeeze casting (LSC) technology. There was also examined the relationship between porosity and mechanical properties of castings. There were evaluated and compared the results of my own measurements with data from previous students theses at the Faculty of Mechanical Engineering BUT. All data were tested by statistical tests. The comparison of simulation results and experimentally measured values was found a good programme-ability to simulate and estimate porosity.
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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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Introduction of special die lubricant - micro spraying into the conditions of high pressure die foundry
Šromota, Michal ; Roučka, Jaromír (referee) ; Krutiš, Vladimír (advisor)
The master thesis, consisting of a theoretical and practical part, focuses on the issue of high pressure die casting, specifically the treatment of the die using micro spray technology. The goal of the thesis was to map the processes that need to be changed in the high pressure die casting foundry in order to successfully implement the use of micro-spraying. The practical part describes the introduction of micro spray technology in the foundry KOVOLIT Modřice a.s. In this case a transition from the conventional spraying method to the micro-spraying is made. After testing, both stable production and the expected savings associated with the operation of micro-spraying were achieved on the selected casting, and therefore it was decided to convert the production of the selected casting to this technology.
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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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Mg-alloy die-castings - trends in industrial
Svoboda, Rostislav ; Juřička, Ivo (referee) ; Čech, Jaroslav (advisor)
The aim of this thesis is to determine influence of porosity and shape-factor over mechanical properties, performed on cast samples from Aalen foundry (Germany), that were high pressure die casted from AZ91 D Alloy. Evaluation of these quantities was done using computer software Olympus Five. Measured values were subjected to statistical analysis in order to eliminate gross errors and determine linear dependence between mechanical properties and porosity eventually voids shape factor.
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Optimization of die casting technology of a thin-walled casting
Míšek, Jakub ; Přecechtěl, Petr (referee) ; Cupák, Petr (advisor)
The aim of this work is to suggest changes of technological process, which will reduce amount of casting defects in cast made by high pressure method. The cast is casting by Alfred Engelmann CZ, spol. s.r.o. from aluminum alloy EN AB - AlSi12 (Fe). Current technology was analyzed and also was made detailed description of the high-pressure casting technology, including a description of materials and machines. To determine the causes of defects and their effects were done casting experimental test series. The results of this experiment showed that the set of casting parameter has a significant influence on the quality of the casting. It was also shown that the preparation of the melt affects the porosity of the casting. At the end was suggested changes of technological process.
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Influence of degasing on casting quality by high pressure casting
Míšek, Jakub ; Kolmačka, Marek (referee) ; Roučka, Jaromír (advisor)
This thesis examines the influence of the degassing process on hydrogen contend and on the quality of part casted by high pressure casting technologies. The type of defects occurring in the casting is analyzed based on macrostructure and microstructure observations. For the overall assessment is used the statistical observation of the evolution trend of scrapping during the experiment. The results show that shortening of the degassing time may affect the incidence of porosity defect.
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Defects of high pressure die cast castings from aluminum alloys
Dočekal, Václav ; Krutiš, Vladimír (referee) ; Kaňa, Václav (advisor)
This thesis is focused on defects occurring in products made by high pressure die casting of aluminum alloys. The theoretical part includes introduction to high pressure die casting technology and description of individual defects, causes and corrective procurations. The practical part focuses on the determination of the defect on the pre-selected casting, which is cast in the foundry ALW INDUSTRY, s.r.o. Based on the identification of the defect, there is a corrective procuration to reduce its occurrence.
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Use of controlled gassing of Al-Si alloys during die casting
Jankes, Erik ; Kaňa, Václav (referee) ; Roučka, Jaromír (advisor)
This master thesis will cover the possibility of using directed gassing of Al-Si alloys in a high pressure die casting foundry. As a control gas, rotary degasser with gaseous 20 % H2 in N2 as a medium was used. Castings were casted via high pressure die casting machine. The aim of this research is to compare internal defect such as porosity or shrinkage of a casts made from degassed and control gassed melt.
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