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Influence of detergents on the accelarated lifetime tests of PE pipes grades.
Štolfová, Kristýna ; Přikryl, Zdeněk (referee) ; Nezbedová, Eva (advisor)
This thesis studies the lifetime of the PE pipes materials. For determination of the lifetime one of the standard accelerated tests (Full Notch Creep test) was used. The main goal is to assess the influence of different types of detergents on lifetime. Specimen preparation and measurement procedure corresponding to the relevant ISO standard (ISO 16770: Plastics - Determination of environmental stress cracking (ESC) of Polyethylene (PE) - Full Notch Creep Test (FNCT)). Air, distilled water, Arkopal N 090 and Arkopal N 110 were used as detergents.
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On the modern surface treatment of pressure casting dies
Černý, Štěpán ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
Bachelor thesis is focused on the influence of surface treatments due to prolonging life and decreasing an amount of service hours on the die casting molds of aluminium alloys. Theoretical analysis of the problem deals with the requirements for tools materials used for making these moulds. Furthermore it deals with the materials which are most commonly used in their production and the species of aluminium alloys which are most commonly casted. The second part of this thesis, which is discussed in detail, deals with design solution regarding to usage of surface finishes on the moulds for die casting and their specific properties. Another part of this thesis contains experimental tests where was measured selected coating in order to determine its behaviour during the casting cycles with a focus on increasing lifetime of the mould insert, also reducing the amount of glued metal on the walls and finally improving the surface of casted part. It was found, according the analysis results, that the TiAlN coating helped to reduce the amount of glued metal on the mould walls. This also helped to reduce the amount of service intervals. On the other side for achieving much better results is better to use TiB2 coating. It has been experimentally confirmed that the TiAlN coating is not suitable for using in die casting moulds of aluminium alloys.
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Service life calculations in machine tools
Novotný, Lukáš ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
The aim of this Bachelor’s Thesis is comparison of service life time calculations of machinetool construction parts according to different producers. The first part of thesis describes three important parts of machine-tools as linear guides, ball screw bearings and ball screws. Main part of thesis refers about search of service life time calculations itself according to various manufacturers and their comparison.
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Comparison of the environmental impact of different car's drive concept
Kopca, Filip ; Blaťák, Ondřej (referee) ; Zháňal, Lubor (advisor)
This thesis describes structure and operation of particular car‘s drive mechanisms, examine and compares their level of harmfulness against living environment. From acquisition, manipulation and distribution of raw material needed for manufacturing vehicles, amount of used propellant, production of emissions during life cycle, resources needed for maintenance, demands of waste disposal and possibilities of recycling.
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Linear feed systems with roller bearing in construction of machine tools
Kolář, Bronislav ; Selingerová, Simona (referee) ; Blecha, Petr (advisor)
Bachelor thesis deals with the detailed description and division of linear feed systems with roller bearing, witch are the esential constructional components of production machines. It describes individual parts of all kinds of feed systems with roller bearing and features examples of individual existing products . It compares possibility of their usage on machine tools. Thesis contains practical example with an overview of the basic calculation used for engineering design of feed system.
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Evaluation of an inspection program and overhauls for ZLIN 26 aircraft
Jančář, Milan ; Finda, Jindřich (referee) ; Augustin, Petr (advisor)
This bachelor´s thesis deals with ZLIN Z 26 Series Aircraft maintenance and repairs procedures. Even the name shows, that this theme is very demanding and extensive. My interest was to explain some maintenance procedures of these aircraft and offer changes of it. In the beginning of this thesis we can briefly learn history of the ZLIN Aircraft and particular Z 226 Series models. There are mentioned difference maintenance procedures, applicable on the planes thru the service life time. Inspection and overhaul procedures are described in details and for better understanding were attached drawings or photos. Following chapter deals with evaluation existing inspections and overhauls - maintenance – procedures. Optimization of the maintenance is part of the chapter fourth, where is described possible innovation of the maintenance check list. In the last, fifth chapter, of this thesis are mentioned possibilities of the ZLIN Aircraft life time prolongation, which is actually discussed because of some aircraft of this type series reached basic life time limit, without any serious fatigue airframe damages appears.
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Linear feed systems in construction of machine tools
Kolaja, Radim ; Opl, Miroslav (referee) ; Blecha, Petr (advisor)
This bachelor thesis deals with the detailed description and division of constructional componets composition of linear feed systems, which are essential part in the construction of machine tools in the manufacturing process. It describes individual subsystems, which are described in details and compared in terms of favorable and unfavorable characteristics for certain working conditions. Out of these possible ways of implementation of linear feed system is initiation one example with an overview of the basic calculations used to design project.
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Economical analysis of a cutting tool
Bilavčík, Jaromír ; Humár, Anton (referee) ; Prokop, Jaroslav (advisor)
Bachelor's thesis on ”Economic analysis of cutting tools“ is devoted to economic analysis the costs of acquisition and use of different types of cutting tools, whose use has a significant influence on the economy of production and, inter alia with the costs related to the quality of the final product. Analysis of the applicability of utility properties of instruments that are used in the mechanical machining was analyzed economically advantageous for the company. This criterion must take account of the company when the production technology. Another decision-making criteria should be the final product quality. For firms pursuing the cost of quality throughout the production cycle is of course due to classical periodic sharpening cutting tools - knives, it is preferable to use instruments with tip.
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