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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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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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Technology of high pressure die-castings and influences having effect on their quality
Štipl, Pavel ; Prášil, Tomáš (referee) ; Roučka, Jaromír (advisor)
This diploma thesis deals with the technology of high pressure die casting and especially influences having effect on their final quality. The aim of this thesis is to design the measures to convert casting of the cylinder for chainsaw into the serial production. The thesis contains a description of the production of castings by technology of high pressure die casting, theoretical analysis of the factors with effects on their final quality and practical description of the conversion casting of cylinder for chainsaw into the serial production. The problem of converting to serial production has been solved by several samplings and final test series. Part of each sampling is analysis of defects and design of measures leading to elimination or at least minimization of such defects. On the basis of the production process has been successfully optimized and casting of the cylinder for chainsaw was successfully converted into the serial production. The results of this work also allowed for a smooth conversion into the serial production of another type of cylinder, manufactured by company MOTOR JIKOV.
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Optimization of simulation parameters in the process of spraying a metal die
Vlček, Ondřej ; Šotka, Pavel (referee) ; Krutiš, Vladimír (advisor)
This thesis, prepared for Škoda Auto, deals with the optimization of die casting simulation parameters in software ProCast. The aim was to develop and validate a methodology for inputting die spray parameters. The optimization itself was performed on a high pressure die casting simulation for an engine block casting. The temperature field was taken from the real die using a thermographic camera and then compared with the simulation. The parameters of the simulation were adjusted according to the experimentally obtained data and literature, and the course of optimization required changing not only the parameters related to the external treatment, but also the material models, or changing the heat transfer coefficient between the die and the casting. By the procedure, the temperature field of the original simulation, which differed from reality by more than 100 °C, was optimised so that the results at the measured locations did not reach a difference of more than ± 20 °C. Therefore, the procedure used can be applied as the required methodology for optimising further simulations.
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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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Optimization of simulation parameters in the process of spraying a metal die
Vlček, Ondřej ; Šotka, Pavel (referee) ; Krutiš, Vladimír (advisor)
This thesis, prepared for Škoda Auto, deals with the optimization of die casting simulation parameters in software ProCast. The aim was to develop and validate a methodology for inputting die spray parameters. The optimization itself was performed on a high pressure die casting simulation for an engine block casting. The temperature field was taken from the real die using a thermographic camera and then compared with the simulation. The parameters of the simulation were adjusted according to the experimentally obtained data and literature, and the course of optimization required changing not only the parameters related to the external treatment, but also the material models, or changing the heat transfer coefficient between the die and the casting. By the procedure, the temperature field of the original simulation, which differed from reality by more than 100 °C, was optimised so that the results at the measured locations did not reach a difference of more than ± 20 °C. Therefore, the procedure used can be applied as the required methodology for optimising further simulations.
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