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Process fluids in machining operations
Vondra, Róbert ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis deals with a process fluids. The first part of the thesis characterizes the fundamentals of machine cutting with the use of the process liquids. Further, there are described the functions of the process fluids and the individual technological requirements placed on the liquids, along with their advantages and disadvantages. The following chapter deals with a specific range of process fluid manufacturers in the world. At the end of this thesis, a use of process fluid in practice is illustrated. CNC grinding machine was used, in order to machine the spiral shape of a micro mill.
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Pilový kotouč v procesu podélného řezání materiálů na bázi dřeva
Veselý, Přemysl
In this dissertation thesis there is listed characteristics of circular saw blades, their distribution, influence of construction adjustments on final behavior of blade in the process of machining, problematic of oscillation of blades a mutual interaction among quality of machined surface, noise and dust. The thesis covers the problems of oscillation of circular saw blades as when idling and operating - the cutting process; and by the use of three circular saw blades with different construction modifications. These aforementioned construction measures are also compared to each other due to the implementation of standard construction saw blades not only from the perspective of oscillation, but also from the perspective of the roughness of the machined surface and the analysis of wood waste generated during cutting and noise. In the theoretical part there is an analysis of available literature and scientific theses. It outlines the particular publications devoted to methods of determining the shapes of oscillation, determining critical, resonant and recommended speed, blade constructions, including possible modifications, the theory of cutting saw blades including determining the size and shape of the splints and the effects of noise on the work environment. An important part of this work is methodology involving direct measurements for detection of unstable states of discs (resonance and critical speed. In this section it is further evaluated measuring of the oscillation of the test saw blade and verification of the proposed methodology with a different and practiced, commonly known method, so called cold shapes: The author also seeks to explore and determine the effect of different tooth pitch and method of execution of slots along with soundproofing grooves on noise levels, the resulting quality of the machined surface of various wood. The generated waste is then analyzed for splitting wood particles in particular size group with the percentage of each chip. The results of the experiment are in discussion confronted with the available scientific theses, taking into account with normal operating conditions, of which the conclusion is drawn.
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Production of Special Spacer using WJM/AWJ
Novotný, Adam ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This thesis on subject "Production of Special Spacer using WJM/AWJ" deals with the problem of progressive advanced technology, nonconventional water jet cutting, describes the process of cutting samples by AWJ technology in engineering company and discusses the effect of selected cutting program on quality of machined surface and dimensional accuracy. An attention is devoted to the substitutability of WJM/AWJ cutting methods and the possibility of combination with conventional technologies.
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Surface changes based on FDM printing parameters
Čada, Jiří ; Sliwková, Petra (referee) ; Zemčík, Oskar (advisor)
This thesis deals with a construction of modified RepRap 3D printer Rebel II which operates with Fused Deposition Modeling technology and selection of suitable criterion for printing. It mainly focuses on the temperature of the material being printed and speed of printing for three selected materials. Materials were selected based on availability in the market and their application. An experiment, focusing on surface changes of products as well as on the look of a fibre after passing through a nozzle, was performed.
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MODERN TECHNOLOGIES IN WIRE ELECTRICAL DISCHARGE MACHINING THE METAL ALLOYS
Mouralová, Kateřina ; Karpíšek, Zdeněk (referee) ; Pokorný, Peter (referee) ; Píška, Miroslav (advisor)
The dissertation is focused on streamlining production on wire electric discharge machine during cutting metal alloys, specifically low-alloy steel quality by CSN 41 4220. The first part contains a study of the current and modern technologies EDM wire cutting. The second part is focused on identifying key parameters to influence the WEDM process, a detailed analysis of the machined surfaces of samples and wire electrodes used for cutting. The result of this work was to explore the possibility, whether by performing planned experiment and subsequent evaluation in the future to determine exactly setting the key parameters influencing the process of WEDM.
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Optimization of Machining Parameters Abradable Sprayed used in the Aerospace Industry
Krajkovič, Pavel ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This thesis is focused on machining of thermal spray coatings. Particularly on testing of machining parameters and their influence on different types of abradable coatings used in the aerospace industry. The aim of research work is to test the parameters, measure cutting forces by using a dynamometer and their impact on the quality of the machined surface. Determination of the optimal machining parameters for different types of coatings based on results of measurements and the evaluation of surface quality. There are also presented techniques of thermal spray application and methods of coating evaluation. Further it describes a method of measuring cutting forces by using the dynamometer and methods of surface quality evaluation.
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Abrasive Water Jet
Kopečný, Libor ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
This dissertation thesis is focused on explaining the broad issue of the non-conventional machining by an abrasive water jet. Introductory chapters deal with various techniques and methods of water-jet cutting and analyze them. Then the following text provides us with a detailed description of the machine itself so that people can understand the way how this technology works. The third chapter is focused on the quality of the resulting surface and the possibility of affecting it by technological parameters. This part is connected with the practical part of my thesis, in which the resultant surfaces of various materials made by different cutting parameters were compared. Subsequent section outlines the development of this technology. The last chapter contains technical and economic evaluation.
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Ověření vlastností nátěrových hmot v rohových spojích okenních rámů
Hadačová, Jana
The thesis focuses on a verification of coating quality in the area of construction joints of a window frame and a casement. Individual samples of eight windows were long term exposed to laboratory conditions that simulate extreme weather conditions during all climatic periods. The main aim of the partial examinations is to obtain information on the quality of different coatings, especially on their adhesion, elasticity, and resistance to temperature changes. The practical part of the thesis is dealing with assessing and documentation of sample states, especially their corner joints, at the beginning of the experiment, as well as during and after the testing. All changes are thoroughly recorded as evidenced by the detailed visual documentation. In the final part, the tests are evaluated with emphasis on frequent defects that occur in practice. The issue of window surface finishes is still an ongoing topic, many problems often occurring in few months after placing windows into the building must be dealt with.
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