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Production of aluminum castings using metal inserts in the technology of casting into ceramic shells
Straka, Pavel ; Zemčík, Ladislav (referee) ; Krutiš, Vladimír (advisor)
The thesis is focused on manufacturing of aluminium castings with inserts by the hybrid investment casting technology. Three measures were proposed to avoid shell cracking caused by thermal expansion of insert. It seems that the covering of insert with a wax is the most efective solution, becasue after dewaxing a gap is formed, which allows insert to dilate. The other solution was based on change of molochite sand to quartz, which has a higher thermal expansion. The last mean to prevent the shell from cracking was adjustment of dewaxing cycle from shock to gradual. Ceramic shell was heated from room temperature to 650 °C. This solution did not avoid shell cracking. Then the simulation of shell heating, pouring of metal and the solidification was made. The information obtained by the manufacturing of experimental casting was used to prototype casting of impeller.
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Artistic casting, theory and practice
Palčíková, Zuzana ; Záděra, Antonín (referee) ; Šenberger, Jaroslav (advisor)
This work deals with the history of the production of art objects by investment pattern. The first part describes the method of casting used in the past and present. Casting technology is described in terms of, mold manufacturing, production lost model used materials. First described in the technology currently used in the production of shell molds. Then is described a technology used since antiquity with the lost production model into plaster molds and then making clay molds. In the practical part of this work is studied the production of cast bull Bull rocks present methods and the method used in ancient times. The first method is the production of cast bull by shell casting. The second method is casting a clay mold and reconstruction of its original form. Finally, are compared castings produced by these two methods.
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Production of aluminum castings using metal inserts in the technology of casting into ceramic shells
Straka, Pavel ; Zemčík, Ladislav (referee) ; Krutiš, Vladimír (advisor)
The thesis is focused on manufacturing of aluminium castings with inserts by the hybrid investment casting technology. Three measures were proposed to avoid shell cracking caused by thermal expansion of insert. It seems that the covering of insert with a wax is the most efective solution, becasue after dewaxing a gap is formed, which allows insert to dilate. The other solution was based on change of molochite sand to quartz, which has a higher thermal expansion. The last mean to prevent the shell from cracking was adjustment of dewaxing cycle from shock to gradual. Ceramic shell was heated from room temperature to 650 °C. This solution did not avoid shell cracking. Then the simulation of shell heating, pouring of metal and the solidification was made. The information obtained by the manufacturing of experimental casting was used to prototype casting of impeller.
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| |
|
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Artistic casting, theory and practice
Palčíková, Zuzana ; Záděra, Antonín (referee) ; Šenberger, Jaroslav (advisor)
This work deals with the history of the production of art objects by investment pattern. The first part describes the method of casting used in the past and present. Casting technology is described in terms of, mold manufacturing, production lost model used materials. First described in the technology currently used in the production of shell molds. Then is described a technology used since antiquity with the lost production model into plaster molds and then making clay molds. In the practical part of this work is studied the production of cast bull Bull rocks present methods and the method used in ancient times. The first method is the production of cast bull by shell casting. The second method is casting a clay mold and reconstruction of its original form. Finally, are compared castings produced by these two methods.
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