National Repository of Grey Literature 47 records found  beginprevious36 - 45next  jump to record: Search took 0.01 seconds. 
Manufacturing of replica of Laurin-Klement engine
Krejčí, Kamil ; Zvěřina, Zdeněk (referee) ; Roučka, Jaromír (advisor)
The goal of the graduation thesis is building of a working replica of the motorcycle engine Laurin&Klement, type TB from 1902. The thesis focuses on the manufacturing of cast parts. The piece production of the engine has been based on extant original pieces, missing pieces have been manufactured according to period photographs and leaflets. This method can be applied for production of missing or damaged pieces of historical motorcycles‘ engines.
Production of spacious thin wall castings from aluminium alloy
Meduna, Radek ; Talián, Viktor (referee) ; Roučka, Jaromír (advisor)
The diploma thesis deals with the production of spacious thin-walled castings of aluminum alloys with a good surface quality. During the casting process, different types of molding sands and aluminum alloys are used. The target of the diploma thesis is to evaluate the casting surface quality, to analyse the defects and to evaluate the results.
Influence of filters on running of metal flow
Makalouš, Jakub ; Veverka, Aleš (referee) ; Roučka, Jaromír (advisor)
This study deals with influence of filters on running of aluminum metal flow. The main objective was to describe hydraulic resistances of assorted filters and running of silting filters by inclusions. Theoretical part generally describes filtration process and also filtration from the point of view of aluminum alloys and the most important characteristics of each type of alumina inclusions. Experimental part deals with flow rate tests, influence of filters on gassiness of melt and metallographic analysis. It was find out, that filter GEPHAL made minimal hydraulic resistance, on the other hand ceramic foam filters type LD made the maximal hydraulic resistance. It is necessary to reduce filtration surface for study running of silting filters by inclusions. Metallographic analysis showed amorphous alumina film inclusions, spinell Al2O3.2MgO, sludge and carbide of silicon.
Semi-solid casting of aluminium alloys
Zelníčková, Marta ; Lána, Ivo (referee) ; Roučka, Jaromír (advisor)
The great emohasis is placed on product quality and ecology of production at this time. New technologies are created still. This technologies are improve quality product and reduce productive cosi to a minimum, while production is the most environmentally. The Semi-solid casting started to developer in the 20 century. Semi-solid casting combines the method of casting and forming. High surface and microstructure guality are guaranteed. However preparation of production is economically costly. The special alloys are suitable for semi-solid casting. Development takes plase still. Aluminium alloys are very utilized for this technology, due to the good mechanical properties.
Manufacturing of castings of a frame of Praga 500 BD motocycle
Vraspír, Kamil ; Haluza, Jakub (referee) ; Roučka, Jaromír (advisor)
The bachelor degree thesis deals with the complete production technology of replica castings of motorcycle frame Praga 500 BD. In the first part of paper is described the historical development of fabric Praga – BD and technical parameters of motorcycle. In the second part is exactly described the production process of model device, comparison of material variants for model producing, forming and preparing metal including casting. Finally the heat treatment and machining castings are described there. The result of work is fabrication of working replica castings of motorcycle frame.
Quality control of castings from aluminium alloys cast by gravity casting into metal moulds
Koplík, Jiří ; Kaňa, Václav (referee) ; Roučka, Jaromír (advisor)
My thesis was focused on the complex technological preparation of the production of a cast SUPPORT T160 for a client. The thesis is divided in the following parts; preparation, construction and production of the metal mold, experimental test of casting foundry, measurement and casting control. A computer software was used as a help in the creation of the cast, construction of the mold, simulation of casting, solidification and temperature.
Thermo-physical parameters of exo-sleeves and their application in simulation programmes
Zajíček, Roman ; Kuzma, Zbyněk (referee) ; Roučka, Jaromír (advisor)
Thesis discusses exothermic sleeves. The first chapter briefly described the defects can occur during solidification. Further, there are provided methods for removing these defects. The method is described in detail using risers with an emphasis on the exothermic sleeves and thermo-physical parameters characterizing these sleeves. It also describes the influence of these parameters on the accuracy of computer simulations. In the final part of the work is done measuring of the real casting, which is then simulated in the Quikcast.
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.
Low alloyed heat resistent iron
Král, Vojtěch ; Bouška, Ondřej (referee) ; Roučka, Jaromír (advisor)
While using iron casting behind temperatures above perhaps 500 oC namely especially at cyclic heat straining, happens to degradation of structure and to failure casts. To this goal certify cast iron with content Si plus Mo. Work set up survey types alloies, feature plus way of production of castings.
The use of aluminium parts in construction of ingeneering constructions
Suk, Pavel ; Střítecký, František (referee) ; Roučka, Jaromír (advisor)
Study describes is dealing with the application of the aluminum extrusions for industrial purposes. The introduction is dealing with the industrial applications in general terms. It includes the chemical and physical properties of aluminum. It is followed by description of various aluminum alloys, their properties such as suitability for machining, welding, plasticity and resistance to corrosion. Next chapter is listing aluminum applications, namely as a building components in civil engineering such as various extrusions and a modular components. At the closing of this paper there is an example of an actual application of aluminum prefabricated conveyer segments. The conveyor is part of an assembly line for K350 units.

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