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Use of 3D technology in foundry industry
Straka, Pavel ; Krutiš, Vladimír (referee) ; Pernica, Vítězslav (advisor)
The work is focused on replacing a faulty briefcase handle with an aluminium substitution. The handle is fabricated with the help of reverse engineering, where the handle is scanned with a 3D scanner. With that information, a model copy of the part is made, which is 3Dprinted from PLA and PolyCast materials. These handles are used as expendable models, which are used for casting using an “investment casting” method. Those are made from an AlSi10Mg alloy. Theoretical part deals with additive technologies, which are mostly used for manufacturing of foundry models and moulds. Next, the basic principles of 3Dscanning are described, and the term reverse engineering is also explained.
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The Roof Structure of Sport Building
Straka, Pavel ; Šmak, Milan (referee) ; Buchta, Stanislav (advisor)
The aim of the bachelor thesis is to design and assess wooden framework of roofing of multipurpose sport hall. The object is located in Moravské Budějovice. Ground plan dimensions are 40 m x 60 m and height is 10,7 m. The main load-bearing elements are full length beams, which statically acts as a double-jointed arches. The design is made of glued laminated wood, solid wood and connecting steel elements. The stability of beams is secured by purlins and transverse stiffeners. The substructure is designed with anchor blocks made of concrete situated on the foundation strips. The front walls are secured by columns and braces.
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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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Roofing of tribune
Straka, Pavel ; Horáček, Martin (referee) ; Balázs, Ivan (advisor)
The subject of this thesis was to design and assess the load-bearing structure of the grandstand roof at the sports stadium. The ground plan dimensions are 35x70 m. The object will be located in Moravské Budějovice. The construction is made of grade steel S355 and steel fasteners. Assessments were created for 2 variants. Variant A with truss, Variant B with plate girder. The truss variant, which is elaborated in more detail, was evaluated as more advantageous.
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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.
|
|
|
Use of 3D technology in foundry industry
Straka, Pavel ; Krutiš, Vladimír (referee) ; Pernica, Vítězslav (advisor)
The work is focused on replacing a faulty briefcase handle with an aluminium substitution. The handle is fabricated with the help of reverse engineering, where the handle is scanned with a 3D scanner. With that information, a model copy of the part is made, which is 3Dprinted from PLA and PolyCast materials. These handles are used as expendable models, which are used for casting using an “investment casting” method. Those are made from an AlSi10Mg alloy. Theoretical part deals with additive technologies, which are mostly used for manufacturing of foundry models and moulds. Next, the basic principles of 3Dscanning are described, and the term reverse engineering is also explained.
|
|
|
Roofing of tribune
Straka, Pavel ; Horáček, Martin (referee) ; Balázs, Ivan (advisor)
The subject of this thesis was to design and assess the load-bearing structure of the grandstand roof at the sports stadium. The ground plan dimensions are 35x70 m. The object will be located in Moravské Budějovice. The construction is made of grade steel S355 and steel fasteners. Assessments were created for 2 variants. Variant A with truss, Variant B with plate girder. The truss variant, which is elaborated in more detail, was evaluated as more advantageous.
|
|
|
The Roof Structure of Sport Building
Straka, Pavel ; Šmak, Milan (referee) ; Buchta, Stanislav (advisor)
The aim of the bachelor thesis is to design and assess wooden framework of roofing of multipurpose sport hall. The object is located in Moravské Budějovice. Ground plan dimensions are 40 m x 60 m and height is 10,7 m. The main load-bearing elements are full length beams, which statically acts as a double-jointed arches. The design is made of glued laminated wood, solid wood and connecting steel elements. The stability of beams is secured by purlins and transverse stiffeners. The substructure is designed with anchor blocks made of concrete situated on the foundation strips. The front walls are secured by columns and braces.
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Material and Energy Utilization of Dry Stabilized Sewage Sludge – Production of Biochar by Medium-Temperature Slow Pyrolysis.
Pohořelý, Michael ; Moško, Jaroslav ; Zach, Boleslav ; Šyc, Michal ; Václavková, Šárka ; Jeremiáš, Michal ; Svoboda, Karel ; Skoblia, S. ; Beňo, Z. ; Brynda, J. ; Trakal, L. ; Straka, Pavel ; Bičáková, Olga ; Innemanová, P.
The article summarizes the main properties of biochar produced by medium-temperature slow pyrolysis of anaerobically stabilized sewage sludge.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22017071208540 - PDF
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