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Present state of investment casting technology
Ostrézí, Barbora ; Vašťák, Patrik (referee) ; Horáček, Milan (advisor)
This bachelor thesis is focusing on production of lost wax pattern and monitoring of the latest trends in this area. Thesis describes procedures of production from mother die, types of used waxes, production of ceramic shell, de-waxing and shell firing, production and using ceramic cores, removal of ceramic shell and finishing operations. The goal of this thesis is to formulate literature search dedicated to overview of presently used technologies and also the latest raw materials used in this technology.
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Dimensional accuracy of Al castings manufactured by lost wax process
Kučera, Tomáš ; Vašťák, Patrik (referee) ; Horáček, Milan (advisor)
The aim of my diploma thesis was to find the possibilities of reaching the dimensional tolerance in the individual phases of casting by the investment casting process. The accuracy of the selected wax patterns and castings were measured by a caliper. At first the selected dimensions of the wax models were measured right after taking them out of the mold and then they were measured during seven days. The castings were measured after pouring. The obtained figures were statistically evaluated. The results show that the large-scale and thick-wall wax model should be coated after seven days of stabilization because the dimensions of the wax model are not stable.
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New ways in manufacturing and construction of mould for wax casting
Dostál, Pavel ; Sedlák, Josef (referee) ; Zouhar, Jan (advisor)
The aim of this work is to compare technology of silicon and aluminium moulds used to make castings using technology of cire perdue with single – piece work. The work itself deals with physical production of silicon mould in vacuum casting system, shaping aluminium mould using CNC machine and subsequent casting of wax models into these moulds. It also handles with physical production of one piece by shaping. It contains background research of the method lost wax casting manufacturing aluminium and silicon moulds and last but not least of Rapid Prototyping technology for producing master model.
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Present state of investment casting technology
Ostrézí, Barbora ; Vašťák, Patrik (referee) ; Horáček, Milan (advisor)
This bachelor thesis is focusing on production of lost wax pattern and monitoring of the latest trends in this area. Thesis describes procedures of production from mother die, types of used waxes, production of ceramic shell, de-waxing and shell firing, production and using ceramic cores, removal of ceramic shell and finishing operations. The goal of this thesis is to formulate literature search dedicated to overview of presently used technologies and also the latest raw materials used in this technology.
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Use of Numerical Simulation to Optimize Wax Patterns Production
Kosour, Vojtěch ; Elbel, Tomáš (referee) ; Nová, Iva (referee) ; Horáček, Milan (advisor)
Production of wax pattern model by injection machine is a one of the key phases of Investment casting process. The thesis deals with the development of numerical simulation wax blend injection in to metal die. The possibilities of selection simulation software – ProCast and Cadmould are described in the relation to numerical predictions of wax injection. Creating of material database of selected wax blends is described. The prototype simulations of die filling are made. The special testing die are designed a used for created simulations. The measurements of initial conditions are mentioned.
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Optimization of wax pattern technology in the company Fimes
Žuja, Jaroslav ; Vašťák, Patrik (referee) ; Horáček, Milan (advisor)
This thesis is to evaluate currently used wax and compare its properties with of newly purchased one. Further, it is to evaluate whether the quality is reflected by using "boiled wax'', which is being used as a runner wax. All tests were carried out at the Fimes a. s. In the first part of this thesis, there is a brief description of the lost wax method. This is followed by a decription of wax blends from technology point of view. The experimental part describes the operations from the production of wax patterns, through their dimensional inspection, up until dewaxing process. All the results are noted and compared.
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Optimization of wax and ceramic shell technologies in the company Fimes
Kolesár, Roman ; Vašťák, Patrik (referee) ; Horáček, Milan (advisor)
The thesis continue thematically in the previous development of the wax mixtures for the company Fimes. The general description of the investment casting process from the production of the die to casting of the wax pattern is handled in the first part. It is followed by the summary of the previously carried out experiments on cracking the shells. The experimental part describes the individual operations from the production of tested wax patterns to casting in the Boilercláv. The newly developed wax mixture is compared to the wax mixture used by the company Fimes. The experiments focus on the possibility of cracking the shells during the casting process and the dimensional stability of wax mixtures.
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Optimized lost wax process by using numerical simulation
Svobodová, Radka ; Horenský, Jiří (referee) ; Horáček, Milan (advisor)
The aim of this diploma thesis is to ascertain the process of injecting the wax through an injection moulding machine under certain input conditions and with the help of the simulation program Cadmould 3D-F®, to perfect the injection and the following solidification of the wax. Only thanks to a perfect injection and the following solidification of the wax, a precise wax pattern can be made. In order to compare the process of injecting the wax mixture, we are helped by the Cadmould 3D-F® simulation program and the records of the injection taken by a video camera. In this thesis a simulation program used when simulating the injection of plastics was applied, as a means of comparison. In this case the similarity between the rheological characteristics of both wax and plastic was exploited.
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