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Production of threads with taps
Juránek, Martin ; Dvořák, Jaromír (referee) ; Píška, Miroslav (advisor)
This Bachelor thesis deals with the issue of production threads with taps. The introduction of th work briefly describes the use of thread in machine-building, thread geometry and basic types of threads. The work goes on to describe the methods tapping and thread control function. The work also deals with the description of types of taps, tool materials and the description of the three most used types of coating in taps. The experimental part adresses the question of whether the thicker layerof the TiN coat leads to an extension of the tool life. Two types of taps were used in the experiment. One type of taps had a coating thickness of 3-4 m and the other had coating thickness of 5-6 m. The experiment included measuring of time-dependent torque. The measured data were processed and subsequently evaluated whether the thicker coating layer resulted in reduced tool wear and increased tool life.
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Thermal spray coatings of bioceramics
Kašpárková, Kristýna ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
Bachelor´s thesis is focused on thermal spraying bioceramics. Bioceramic is designed to replace damaged parts of the human body. Practical use is mainly in orthopedics, jaw and facial surgery. This category of materials includes hydroxyapatite, which is characterized by biocompatibility and the ability to form a strong bond between the bone and the implant. The experimental part of the thesis was spraying 40 - pieces of dental implants for the company LASAK s.r.o. Plasma spraying technology was used to apply the hydroxyapatite coating. The required coating thickness was 60 m. The implant was sprayed and cleaned before spraying. Spraying was carried out in the laboratory of plasma coatings dental and skeletal implants ÚST FSI VUT Brno. A dimensional control was performed after plasma spraying.
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Cutting tools for deep drilling and their use in practice
Sedlář, Jiří ; Kalivoda, Milan (referee) ; Jaroš, Aleš (advisor)
This bachelor thesis deals with tools for drilling deep holes. The first part is focused on the basic description of the drilling process, sorting the tools according to their construction and last but not least, sorting of the systems used for deep drilling. In the theses is further elaborated an overview of materials for the production of cutting tools and ways of coating, which are used the most nowadays. There is a constant development in coating, because of the better mechanical, physical and chemical properties in this field. The last part is dedicated to the definition of the tools for deep drilling and their use in practice.
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Modern cutting cemented carbide tools
Štefek, Jaromír ; Kalivoda, Milan (referee) ; Píška, Miroslav (advisor)
This thesis deals with modern cutting cemented carbide tools. In the first section are stated several basic innovations already used tools for basic machining operations, which is turning, milling and drilling. It continues with analysis of single materials for production of cemented carbides, non coated as well as coated and with comparing of their properties. There are listed the basic cutting properties of the cutting tools after that. The penultimate point of the work is optimization of the basic machining operations, namely roughing and finishing, for a given application, which is in this case turning on the lamp stand. Finally, everything is summed up and evaluated in the conclusion.
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Tools Made from Cemented Carbide
Opršál, Ladislav ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
The thesis focuses on cutting tools made of both coated and uncoated cemented carbides. The first part of the thesis deals with the division of materials used for the production of the tools. The second part of the thesis introduces uncoated cemented carbides, special attention being paid to the labelling, production and properties of such compounds. The third part of the thesis presents coating deposition techniques and examines the properties of coating layers. Coating layers are produced using two different methods – CVD and PVD. The last part of the thesis compares the properties of the cutting tools (e.g. their cutting values) produced by the companies Pramet Tools, Sandvik – Coromant and Seco Tools.
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High Speed Steels Cutting Tools and their Applications Today
Nosek, Jan ; Dvořák, Jaromír (referee) ; Sliwková, Petra (advisor)
My bachelor’s thesis “High speed steels cutting tools and their applications today” is about a chemical concept, a heat processing, a cutting property and a production of cutting tools of high speed steel materials. This work consist a possibility of an increase performance, a resist of high temperatures and a durability of high speed steel tools by means of PVD films and an accessible technologies. Next I must found producers of cutting tools and their production of high speed steels.
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Determination of mechanical characteristics of coatings using impulse excitation technique
Valášek, Daniel ; Řehořek, Lukáš (referee) ; Válka, Libor (advisor)
This diploma thesis deals with the determination of the Young’s modulus of coatings using the impulse excitation technique (IET). The theoretical part of the thesis describes Cold and Thermal Spray technology, theoretical foundations of the impulse excitation technique and models of composite materials. The experimental part of the thesis deals with the determination of the tensile modulus of copper coating created by Cold Spray technology. The impulse excitation technique has been used to measure fifteen samples with coating thickness ranging approximately from 0,4 to 2 mm. Results from this measurement were evaluated using five composite models to establish the Young’s modulus of the applied coating. The best results were achieved by using the composite model based on rule of mixtures (ROM).
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Surface Modification of Ferrous Materials
Jakubčíková, Lucie ; Tulka, Jaromír (referee) ; Molliková, Eva (advisor)
The bachelor´s thesis is about surface treatments. There are mentioned iron-based materials and their marking. The process of corrosion and wear of materials is described. Then is analyzed the main topic of surface pretreatments, metal, inorganic non-metallic and organic coatings. The basic properties of the coatings and their testing is described. At the end are mentioned the negative effects of the surface treatments.
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