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Use of thermally conductive non-metallic materials for cooling systems in automotive lighting technology
Zachar, Martin ; Makki, Zbyněk (referee) ; Vitkovič, Pavol (referee) ; Kotrbáček, Petr (advisor)
This thesis deals with the use of non-metallic highly thermally conductive materials, more concrete-ly special plastic materials, enriched with highly thermally conductive additives, for the purpose of passive cooling of a given heat source. The thesis compares the effectivity of these heat sinks with the classically used materials, specifically aluminium. The thesis is divided into two main sections, theoretical and practical. The theoretical part deals with a constantly growing need of LED (Light Emitting Diode) chips cooling in automotive head-lamps, where the new materials could be put into effect, analyses possible replacement of classic aluminium heat sinks with different materials with a significantly lower thermal conductivity and introduces problems of such materials. The practical part applies the problematic described in the theoretical one on the actually produced heat sinks, which are compared among themselves, with regard to their method of production, as well as with aluminium counterpart in different conditions. Furthermore, the problematic of de-signing a heat sink made from material which is characteristic for its highly anisotropic thermal con-ductivity is dealt with. The end of the thesis shows the importance of heat dissipation via radiation, which can have a great significance in case of plastic heat sinks and in a specific applications.
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Testing of selected material properties for 3D printing
Čáslavský, František ; Mačák, Martin (referee) ; Vyroubal, Petr (advisor)
This thesis deals with 3D printing, materials used for 3D printing, testing of the materials and learning their real parameters. Goal of the thesis is comparing selected materials, executing series of mechanical test and selecting suitable material for printing high-quality plastic parts for use in automobiles, especially for reproduction of parts that are no longer made for oldtimers and for use in motorsport.
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Technical viscous curve for injection molding
Hejkalová, Anna ; Svoboda, Jan (referee) ; Kandus, Bohumil (advisor)
Injection molding is highly dependent on flow qualities of plastics. The bachelor thesis compares the conventional measurement of their rheological attributes with the method of injection molding to the technical viscous curve. This method enables to determine the optimum injection rate at which injection resistance does not allow significant improvement of the melt’s flow attributes, on the contrary increases the energy consumption of the process. At the same time, the thesis tries to prove the advantage of this method.
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Robust wheeled robotic chassis
Jirges, Radek ; Chalupa, Jan (referee) ; Bastl, Michal (advisor)
This thesis deals with the issue of the proposal of mobile wheeled robotic chassis. In the introductory theoretical part gives an overview of the division of mobile chassis inclu-ding representatives of each group. In the begining of the practical part describes se-lection of suitable components for the chassis from drivetrain to controlling electronics. Constructional part of this thesis at first deal with selection of suitable material for each part of chassis and than follows construction of these components including decsription of used constructional solutions for each issue. Result of this thesis is robust wheeled chassis fitted with drivetrain and basic electronics.
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Mechanical design of plastic parts crusher
Šebesta, Karel ; Brandejs, Jan (referee) ; Paloušek, David (advisor)
The thesis focuses on the construction of shredder of plastic components produced by 3D printers. The aim of the thesis is to design a shredder whose output components, the so-called flakes, could be used to produce recycled filament. The first part of the thesis covers an analysis of technology of shredding. Furthermore, the properties of shredded material and the requirements for the quality of output granules are determined. Based on the research, the parameters for the efficient shredder are defined. In accordance with these parameters, several variants are created, from which the final design of the two-stage shredder is selected and constructed.
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Toy or Toxic Waste?: Our study is a continuation of the investigations of IPEN and Arnika that found octaBDE, decaBDE and HBCD in Rubik's cubes, children's toys and hair accessories, i.e., products that were not treated with these substances but made of recycled plastic.
Petrlík, Jindřich ; Straková, Jitka
Our study is a continuation of the investigations of IPEN and Arnika that found octaBDE, decaBDE and HBCD in Rubik's cubes, children's toys and hair accessories, i.e., products that were not treated with these substances but made of recycled plastic. The previous study indicates that banned brominated flame retardants commonly found in hazardous electronic and building waste are recycled into new products where they were not present historically. We conducted additional sampling to further examine whether toxic substances are being recycled into children’s toys on the Czech market.
Fulltext:  PDF
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Toys friendly to environment and safely for children in kindergarten
NOVÁKOVÁ, Viktorie
This bachalors's thesis regards toys which are used for preschool children. The aim of this thesis is to discover what toys are suitable for children in terms of safety and frugality to nature and what attitude to these toys have nursery school teachers. The bachalors's thesis is divided in two parts theoretical and practical. The theoretical part focuses on importance of toys for preschool children, safety requirments and the impact on the environment. The practical part assesses the state of toys in two different preschools. By observation it is determined what toys are the most suitable and what alternatives can be used.
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Parametric model of injection mold
Tomanec, Pavel ; Vrána, Radek (referee) ; Brandejs, Jan (advisor)
This bachelor thesis is concerned with creating parametric model of plates injection mold for plastic by using software CatiaV5. It is used for faster and more efficient in the design of the injection mold. The first section describes the basic design and technological elements for designing injection molds. The second part describes the system for creating and constrain the parameters finally verify the functionality of the created model.
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Comparison of production possibilities gears plastic and metal
Květoun, Jan ; Žák, Ladislav (referee) ; Kandus, Bohumil (advisor)
This project is focused on comparison technologies of making cogwheels from plastic and metal. Inside are described principles, descriptions of technologies and appropriate usage or advantages and disadvantages. Mentioned technologies of making metal gears are primarily machining for example milling, slotting or grinding. Making of plastic gears is primarily focused on injection moulding. Practical part of this thesis is focused on exchange metal cogwheel with plastic cogwheel with helping calculations and information from resources. Exchanged cogwheel is from motorcycle ČZ 175/453.
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Production technology of plastic lamp shade
Čajan, Tomáš ; Kebrle, Ondřej (referee) ; Kandus, Bohumil (advisor)
This master thesis deals with design of injection molding technology for plastic lamp shade made of polycarbonate labelled Lexan 925. The injection is performed into injection mold with hot runner system. Initially there is a general study related to plastic materials and injection molding technology. Further the study continues with technological solution of production of the lamp shade. The designed injection mold is two-plate, double cavity mold with two hot nozzles and is equipped with a thread-unscrewing machine. This thesis contains part of the documentation and item list of the injection mold, along with technical-economical evaluation of the developed solution.
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