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Optimization of die casting technology for the casting of vacuum pump
Krňávek, Štěpán ; Kolmačka, Marek (referee) ; Roučka, Jaromír (advisor)
Diploma thesis deals with optimization of technological process casting a die cast, which is part of vacuum pump. The die cast is made from alloy AlSi9Cu3(Fe) in foundry KOVOLIT, a. s. There is a problem with inner defects at this cast. Solution of this thesis is to suggest suitable actions to minimize of incidence the defects in the cast. According to analysis of the defects in the cast these defects were classified as combination of shrinkages and gas holes. According to analysis causes of the defects are high temperature of die mould and closed air in die mould. As a result suitable actions were suggested – a change of the die mould tempering and a design adjustment of the cast. In case of implementing a new die mould in the manufacture a new gating system was designed. Suitability of the new gating system was assessed according to simulation of filling die cavity.
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Defects in steel castings
Jakubec, Petr ; Kaňa, Václav (referee) ; Pernica, Vítězslav (advisor)
This bachelor’s thesis deals with the problems of defects that occur in steel castings. First, the use of steel in the foundry industry and the development of classification of casting defects are described. Furthermore, it defines the term ‘casting defect’ and its division. The main part of the thesis focuses on the most frequent defects in steel castings. The aim of this literature search is to describe the casting defects and their causes and to present possible precautions against their rise. Possible ways of removing the casting defects are discussed as well as their repairs.
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Optimation of heavy steel castings
Pernica, Vítězslav ; Veselý, Pavel (referee) ; Šenberger, Jaroslav (advisor)
Diploma thesis deal with definnig the casuses of stell castings defects in the DSB EURO s.r.o Foundry. The main target is to optimise technological parameters for avoiding the surface casting defects. The first stage is the identification of the defects, describing of the main reasons and mechanic. Defect quantification is make from measuring of area and volume of the mended defects. In association with surface defects, the number of the crackings was observed. Finally there are suggested correction actions based on the previous investigation.
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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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Developments in numerical simulation of foundry processes
Haluza, Jakub ; Kováč, Marek (referee) ; Krutiš, Vladimír (advisor)
With the development of the computer equipment the numerical simulation has become a strong tool for the design and optimization of foundry processes. The goal of the modelling is the tuning of the casting technology in pre-manufacturing stage. Numercial simulation allows studying metal flow, solidification and casting cooling. The work will be aimed to new trends and developments in the field of numerical simulation of foundry processes.
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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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Optimization of heavy steel castings manufacture
Malý, Václav ; Carbol, Zdeněk (referee) ; Šenberger, Jaroslav (advisor)
In its first part the work deals with the frequent defects of heavy steel castings. Experiments were carried out in very heavy bearing rings casting of cement kilns in order to reduce consumption of liquid metal and to increase the internal quality of castings. The progress was achieved by introducing new technologies; this thesis describes the technologies used and subsequently performs their comparison.
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