National Repository of Grey Literature 49 records found  previous11 - 20nextend  jump to record: Search took 0.01 seconds. 
Foundry molding mixtures with biopolymer binders
Šindlerová, Eliška ; Janský, Vojtěch (referee) ; Pernica, Vítězslav (advisor)
This work is interested in a new modern solutions in the field of foundry binders. Several biopolymer materials suitable for foundry industry are described and the conditions for using these materials and few examples of casting tests with the use of the biopolymer binders. The main reason why the biopolymer materials are coming back to the industry is a huge amount of strict environmental requirements for the ecological behavior of industrial enterprises and current very bad ecological situation. However this inovative solutions doesn´t have to be only benefits for our environment but the can bring various simplifications to the production process, shortening the time required for preparation or technological breaks, and lower the costs of input material and subsequent waste treatment.
Magnesium castings and their applications
Škriečková, Natália ; Kaňa, Václav (referee) ; Pernica, Vítězslav (advisor)
This bachelor thesis is focused on summarizing the knowledge about magnesium and magnesium alloys and their use in various industries. In the introductory part, the beneficial properties of this metal, its alloys and methods of production are highlighted. The second part is focused on castings of these alloys, where we describe their preparation and the actual casting process in various ways. Based on previous research, we evaluate the development of the use of these alloys in various industries such as automotive, aerospace and electrical engineering, as well as modern use in medicine. Last but not least, we criticize the positives and negatives of the entire process of production of final parts in terms of environmental impact.
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.
Lining of the induction furnaces
Kopečný, Vendelín ; Pernica, Vítězslav (referee) ; Myška, Martin (advisor)
This work deals with lining of electric induction furnaces. The first part describes the preparation of lining, its function during the running of furnace and also its tearing down at the end of work process. In the thesis is also discussed the use of rammed crucibles. The materials used for lining and rammed crucibles are described also in the sense of their chemical properties in connection with the possibilities of their use under different conditions. The practical part of the thesis describes the process of lining the electric induction furnace, which was realized by the author under the supervision of the supervisor.
Casting technology in bell founding
Šromota, Michal ; Pernica, Vítězslav (referee) ; Janský, Vojtěch (advisor)
The topic of the bachelor’s thesis, which comprises of theoretical and practical part, is campanology. The purpose was to summarize the technology of the bells’ manufacture from both, current and historical viewpoints. Basis of the theoretical part is literary recherche which describes the whole process of the bell’s manufacturing, material used for its casting, acoustic features of the bell, history of the industry and parts which are integral part of the bell. The recherche was composed mainly based on Czech academic literature, nonetheless, to a lesser extent, abroad resources were included too. Within the framework of the practical part a bronze bell was casted by a lost wax method with the contribution of 3D print.
Hydrogen porosity issues in aluminum alloy castings
Kazdera, Vojtěch ; Pernica, Vítězslav (referee) ; Kaňa, Václav (advisor)
This bachelor thesis focuses on the creation of a search for hydrogen porosity in aluminium alloy castings. First, the formation of gas cavities in pure aluminium and its alloys and the influence of gas cavities on the properties of castings are explained. Then an overview of direct and indirect methods for measuring the hydrogen content in the melt is compiled. Direct measurement methods include the electrochemical sensor method and indirect methods include the Straube – Pfeiffer method. In the last part of the work, attention is dedicated to methods for melt degassing. The most commonly used degassing methods include the gas bubble degassing method and the vacuum degassing method.
Production of casting cylinder for engine modification of motorcycle Jawa 50
Chvátal, Pavel ; Pernica, Vítězslav (referee) ; Bořil, Petr (advisor)
Production of casting cylinder for engine modification of motorcycle Jawa 50. This bachelor thesis deals with the design of an air-cooled cylinder for racing modification of the JAWA 50 engine and its subsequent implementation using the rapid prototyping function. The designed part was cast and the finished casting was subjected to analysis.
3D printing methods for foundry applications
Rendek, Andrej ; Pernica, Vítězslav (referee) ; Krutiš, Vladimír (advisor)
The bachelor thesis is focused on the application of 3D printing methods for foundries, specifically for investment casting technology. The paper describes different printing methods and principles which they are based on with a more detailed description of materials containing their properties and in some cases recommended modifications of the casting process. The last part is devoted to price comparison of three selected methods of model printing for investment casting and dilatometry of six materials with evaluation of their coefficients of thermal expansion and glass transition temperatures.
Corrosion resistance of cast duplex stainless steels
Müller, Peter ; Záděra, Antonín (referee) ; Pernica, Vítězslav (advisor)
The master’s thesis deals with corrosion resistance of cast duplex steels. In the first part the corrosion mechanisms and their individual types are described, the second part characterizes the types of stainless steels in terms of their properties, use, structural components, and their impact on mechanical and corrosion properties of steels. Individual chapter is dedicated to duplex steels. In the experimental part the resistance of 1.4517 steel against pitting corrosion depending on the alloy contents and the PREN value was investigated. Four specimens graded according to PREN were cast. Supplemented with sample stirrer blade which was affected by corrosion during service they were subjected to corrosion test according to ASTM G48-11 standard in 6% FeCl3 solution. Cast specimens were subjected to tensile test and impact test.
Inclusions in steel castings
Kaněra, Miloš ; Šenberger, Jaroslav (referee) ; Pernica, Vítězslav (advisor)
This thesis presents basic knowledge and dividing about inclusions which, by their presence, influence quality and used property of steel casts. With focusing on basic group of exogenous and endogenous inclusions, the abstract of shapes was made as well as composition, condition for emergence and the reaction of melt which is in touch with surrounding impacts. The presence of characteristic inclusions influence technological dimension containing formability or fatigue behaviour falling into mechanical dimension. Constantly growing demands increase the importance of prevention, eventually reduction of impurity fraction with the help of steel refinement or inclusion modification. Success of suggested arrangements for quality improving is analysed by the following methods of identification.

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