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Properties of moulding mixtures of mixed bentonites after repeated use
Virgl, Vítězslav ; Neudert, Alois (referee) ; Kaňa, Václav (advisor)
High class mold is required for high quality castings. At present, the demands on molding materials are being extended by adding the strict requirement of environmentalists. A suitable variant that meets both demands are green sand molds. The goal of the thesis is to repeatedly cast experimental castings into molds made of 4 types of green sand mixtures. The technological properties of the molds will be compared, the degree of bentonite degradation will be assessed and the surface quality of castings will be assessed according to the amount of adherent molding mixture.
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Comparison of quality of milk from conventional and organic farming
Cermanová, Ivana ; Vítová, Eva (referee) ; doc.Ing.Oto Hanuš, Ph.D. (advisor)
The diploma thesis focuses on the comparison of milk quality in two different ways of farming, conventional and organic farming. Almost a hundred parameters on the set of 64 bulk milk samples were monitored. The theoretical part of the paper describes the composition of cow's milk, its technological and hygienic properties and it notes the nutritional impact of milk and milk products. It also mentions the most important legal definition of organic farming. Experimental part describes the setting of the experiment and mentions the methods used to analyze milk samples for individual parameters and it details the ten selected determination. The difference in measured values of various milk indicators depending on the dairy farm was observed by using statistical methods and an explanation was suggested in the case of the statistical significance. The thesis was based on the cooperation of the Faculty of Chemistry VUT Brno and a National reference laboratory for raw milk at the Research Institute for Cattle Breeding in Rapotin.
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Non-ferrous alloys and their use in practice
Měřinský, Ivo ; Mikulka, Vít (referee) ; Staňková, Markéta (advisor)
This work introduces us with non-ferrous metal alloys and their applications in industry. The area is dedicated to the most widespread copper and aluminium alloys, less used alloys, such as magnesium, titanium, gold and silver alloys. For each alloy is given its manufacturing technology, distribution according to different perspectives and their properties. At the end of each chapter you can meet with examples of using alloys in practice.
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Technological applications of cemented carbide tools
Kolomazník, Aleš ; Humár, Anton (referee) ; Prokop, Jaroslav (advisor)
bachelors thesis is on focused on the task:specification and analysis of technological application conditions of cutting tools Carbide.It consists of three parts.The first part deals wiht the development of SK,the nature and properties of sintered carbides.The second part focuses on the technological conditions of parameters of the job application Carbide.The goal was getting to know the structure,production,properties and applications
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Influence of chemical composition of steel on structure and properties of stainless steels
Valenta, Pavel ; Čech, Jan (referee) ; Záděra, Antonín (advisor)
The thesis is focused on high-alloy austenitic and austenitic-ferritic (duplex) steel. The theoretical part includes research about high-alloy steels and basic introduction to this issue. In the practical part of the test there were casted refractory austenitic steel 30CH3N17G2L, duplex stainless steel 1.4462, low carbon steel and high carbon steel. On the castings of austenitic steel were made mechanical and technological tests. There were evaluated the effects of different casting temperature and casting wall thickness to the microstructures and macrostructures of steel, tensile strength and charpy impact tests. The technological tests compared technological properties of these steels.
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Influence of chemical composition, casting temperature and the used deoxidation on technological properties of austenitic chrome-nickel steels
Myška, Martin ; Dulava, Martin (referee) ; Záděra, Antonín (advisor)
The thesis deals with austenitic stainless steel ČSN 42 2930, ASTM A351 CF8 and evaluates its mechanical and technological properties. The first part of this work is focused on properties of austenitic steels, it describes the process of melting and casting of steel on the basis of the realized experiments. It also deals with the mechanical properties of the used steel. The second section of the thesis is dedicated to the historical development of the maximum fluidity tests and main factors affecting the maximum fluidity of alloys. Maximum fluidity values have been processed on the basis of different casting temperatures of the maximum fluidity tests of the used steel. The third part of the work examines the effect of the casting temperature on the feeding distance of the used steel as well as the influence on its shrinkage rate.
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The effect of aluminum age on welding and other technological processes
Hanáková, Anna ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
This thesis deals with the investigation of changes in the properties of aluminium alloys with respect to the age of the material. Aluminium alloy EN AW 6060 of different ages was chosen as the tested material. The alloy was in form of shaped or flat extruded profiles provided by company Pars Komponenty, s.r.o. First, a theoretical basics about the properties and division of aluminium and its alloys were presented, their heat treatment and welding options were presented as well. The theoretical part concerning welding focuses mainly on the problems of welding aluminium alloys and defects of the welded joints. In connection with this issue, material tests of basic materials and welded joints are described as a tool for detecting defects and determining the mechanical and technological properties of the material. In the experimental part, the profiles were TIG welded. Next, hardness, tensile, bending and macroscopic tests were performed. The results were technically and economically evaluated.
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Technologické a kulinárne vlastnosti hovädzieho mäsa
Straková, Katarína
This bachelor thesis deals with the topic Technological and culinary properties of be-ef meat. The first part describes the influences that affect the quality of the meat still on the living animal. It deals with the effect of the breed on the resulting quality, as well as the age, cathegory of the body, the way of feeding and housing. Another part illustrates the use of individual cuttings of the bovine body and their subsequent culinary tre-atment. Also mentioned are muscle tissues and proteins. The last part discusses the bio-chemical relationships between meat before and after the heat treatment, post-mortem processes and processes that occur during the cooking of beef meat.
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