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Heat Treatment of Forged Axles
Kaizar, Libor ; Němec, Karel (referee) ; Molliková, Eva (advisor)
This thesis presents a production and heat treatment of forged axles. Additionally, there is the supplier selection procedures for the production of steel axles, mechanical and chemical tests, methods of preservation and packaging of axles. All procedures and technologies that are listed in this work are used in Bonatrans Group Inc., which is in production and processing of axles one of the largest companies in the world.
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Frames of Tennis Rackets
Rajdlík, Lukáš ; Němec, Karel (referee) ; Molliková, Eva (advisor)
This bachelor’s thesis deals with materials used for manufacturing of the frame of tennis rackets. The thesis informs about the frame of tennis rackets development, from the origins of tennis to these days, when there are modern technologies used. There are parts of the frame of a tennis racket and construction requirements defined. There are two samples of tennis rackets investigated and the both samples are compared with each other.
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Surface Modification of Zinc Alloys
Kinc, Marek ; Foral, Karel (referee) ; Molliková, Eva (advisor)
The object of this bachelor’s thesis is to create a research in field of zinc alloys. In the first part, there are outlined production of pure zinc with a different methods and briefly described the treatment of waste. The next are described the zinc alloys and their properties and outline the ways of die casting. The end of this thesis is focused on methods of finishing the surfaces.
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Biodegradable plastics
Schifferová, Zuzana ; Jan, Vít (referee) ; Molliková, Eva (advisor)
The aim of this bachelor theses is to discuss the process of biodegradation occurring with biodegradable polymers including factors affecting this process. The theses also introduces some types of biodegradable plastics including their properties. At last it discusses waste management of these plastics and their ecological impact.
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Influence of pyrrolidone derivates on alkyd and polyurethane coatings.
Klímová, Edita ; Molliková, Eva (referee) ; Tulka, Jaromír (advisor)
The aim of this thesis was to append data on chemical resistance of coatings made of paints based on alkyd and polyurethane resins. In the theoretical part, relevant information on coatings, preparation of their systems, theory of solubilization and properties of solvents were collected and organized. Three N-derivates of pyrrolidone were chosen for the practical part. Their influence on particular alkyd and polyurethane coatings was studied with emphasis on time course of coatings degradation.
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The reduction of pores in welds
Němečková, Monika ; Molliková, Eva (referee) ; Němec, Karel (advisor)
This bachelor thesis dealt with the reduction of pores in the welds. These welds were in pressure stacks which are made by the Bosch company. There are Common Rail diesel injection systems in which are those pressure stacks used in. An analysis was compiled, which consisted of dates of scrap rates in the yeas 2016, and the values in which the media changed in washing machines where the pressure stacks were cleaned of grease. From the following graphs is obvious when the scraps appeared mostly and according to these results there is a proposal to reduce the porosity in the welds.
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Corrosion of Metals in Chlorides According to Global Harmonized System
Kundrát, Vojtěch ; Tulka,, Jaromír (referee) ; Tulka,, Jaromír (referee) ; Molliková, Eva (advisor)
Transportation of chemicals and mixtures often leads to corrosive damage to their protective packaging, which could cause leakage of transported chemicals to the surroundings. This thesis deals with the corrosive effects of a solution which contains distilled water with 5 wt. % of NaCl solution and distilled water containing 2.5 wt. % of NaCl and 2.5 wt. % of urea. Samples of aluminium with purity of 99.5 % and non-alloy steel EN 10131 were exposed to these corrosive environments. Based on the performed corrosion tests were evaluated weight losses, the speed of corrosion, metallographic evaluation and comparison of results with the criteria according to the OECD methodology, which is indicated by GHS.
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Energy Chains
Oríšek, Petr ; Němec, Karel (referee) ; Molliková, Eva (advisor)
The thesis points to the importance of energy chains in the engineering practice and the wide range of their usage. The elaboration of this topic includes presentation of various types of energy chains, information about their construction, application and history. The emphasis is put on defining the properties that the chosen material must have in order to meet all requirements for energy chain. The thesis provides general information about the materials suitable for production of the chains and their properties and presents concrete materials used in the practice. Furthermore, a part of the work is dedicated to flexible cables which are inserted to the energy chains and their properties. There is a number of companies producing energy chains worldwide. The thesis makes use of the information furnished by one of these companies.
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Materials for Securing Fixed and its Degradation
Pálka, Lukáš ; Molliková, Eva (referee) ; Němec, Karel (advisor)
This bachelor’s thesis covers an overview of materials used for mountaineering fixed protection manufacturing (current and earlier used materials). It also deals with degradation processes found in fixed protection used in mountaineering practice. It quantifies basic degradation processes appearing on mountaineering routes of sport and also of alpine disposition. The thesis also takes in consideration specific damage, occurrence and extent of which is difficult to predict. Then it shows a need for further research of characters of real geological and climatic conditions and corresponding choice of suitable materials and establish a uniform procedure for detecting defects.
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Materials for Production of Chords for Musical Instruments
Krhut, Štěpán ; Němec, Karel (referee) ; Molliková, Eva (advisor)
My bachelor’s work is about materials used for making the musical strings and its protection against its wear off. The introduction deals with evolution and history of the musical strings and the next chapters explain physical basics of the vibrations and how to make the musical string. There are also highlighted and many times mentioned guitar strings in my work due to the string manufacturers are made to develop and implement various high level demands into the strings because of the many various guitar playing techniques.
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