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The influence of PVD coating on tool life of cutting inserts during face milling
Jašek, Petr ; Fiala, Zdeněk (referee) ; Jaroš, Aleš (advisor)
This diploma thesis is aimed on durability of PVD and CVD coatings for symmetrical face milling. The theoretical part describes the characteristics of cemented carbides, milling technology and the characteristics of the coating methods. The experimental part describes the machine tool, used tools, workpiece material and cutting conditions. The aim of the work was to measure the cutting forces and tool wear during the milling. Based on experiment, it is clear that the PVD coatings with nano-layers achieves to the longer life in comparison with others and generally, that the using of coatings leads to reduction of cutting powers and lifetime was increased.
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Dynamic characteristic of the workpiece in turning
Nádvorník, Vít ; Štetina, Jakub (referee) ; Fiala, Zdeněk (advisor)
The contens of master thesis is theoretical analysis of vibrations during turning and possibillity to eliminate them, measure dynamic compliance and modal paramteters. The goal of experimental part is to determine the effect of material and type of clamping for three shafts at natural frequency, mode shape and dynamic compliance. Using these results we can optimized cutting parameters and to better overcome vibration during machining.
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A new production technology of a rotational part
Sychra, Jiří ; Fiala, Zdeněk (referee) ; Píška, Miroslav (advisor)
This master’s thesis is focused on a new production technology of a rotational part. The SolidWorks software was used for create the component design. According to the proposed models, CNC program using parametric programming using mathematical functions was created in the CNC Syntax Editor Free Edition program. The final step was the experimental verification of the functionality and components compared with other type and the economical evaluation of manufactured components.
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Analysis of Specific Cutting Forces for New Materials and CNC Machining
Fiala, Zdeněk ; Bach, Pavel (referee) ; Petrů,, Jana (referee) ; Píška, Miroslav (advisor)
This dissertation thesis is focused on the analysis of specific cutting forces and accompanying effects during machining of the new materials, composite materials. The experimental part is split up to two main chapters. In the first chapter, the development of specific cutting forces is analyzed in detail when cutting conditions are changing. The experimental machining of glass/polyester and carbon/epoxy composites is described for fibers orientations 0 a 90 (ie, the orientation of the fibers in the feed rate direction and perpendicular to the feed rate direction). The influence of the cutting tool flank wear on the specific cutting force is investigated further. The last section compares the values of specific cutting forces when machining with carbide milling tools deposited by different types of coating. The second chapter describes the measurement of sound spectrums generated by cutting process, sound maps creating and finding possible correlations between dominant frequencies of the sound and the specific cutting forces, or the cutting tool flank wear. The measurements are described for the cases of machining steel 15 260.7 and glass-polyester composite material.
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Production and aplication of 3D FDM deltabot printer
Knapil, Josef ; Fiala, Zdeněk (referee) ; Zemčík, Oskar (advisor)
The thesis describes design and aplication of 3D FDM printer type of delta. The first part describes methods of rapid prototyping. The second part describes 3D printers type of delta. The third part deals with construction and calibration of delta printer. In the fourth part are made suitable modifications to the design of the printer, to improve the quality of printing, which is then applied on a sample product. The final section is devoted to technical and economic evaluation.
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Modern cutting tools for grooving and cutting-off
Matoušek, Jan ; Fiala, Zdeněk (referee) ; Píška, Miroslav (advisor)
The thesis in question deals with the influence of geometry of the cutting tool with a non-null angle r and of the cutting conditions on change of cutting tool’s overall deformation during the process of cutting-off and grooving. When conducting the experiments the loading of cutting tool was measured, there was created a simple 3D model of the cutting tool based on measured data, the deformation analysis of the cutting tool by the simulation programme ANSYS was performed and on the grounds of established facts there was made a conclusion on attributes of the cutting tool during the process of cutting-off and grooving.
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On the increase of cutting performance of thread cutting taps with PVD coatings
Grygárek, David ; Fiala, Zdeněk (referee) ; Píška, Miroslav (advisor)
This diploma thesis deals with HSS cutting taps performance in combination with very hard and tribological PVD coating application and their contribution to increasing of cutting properties. Then is described the mechanisms and forms of cutting tool wear. The goal of the experimental part of the thesis was determine, compare and subsequently evaluate cutting properties of threading tools using taps with different types of PVD coatings. During realization of the experiment, constant cutting conditions have been ensured and the only variable were the different types of coating layers. The result of the experiment was measurement of cutting torques depending on time and rate of wear of cutting tools. Measured value are statistically processed and drawn conclusion.
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Design of stabilization mechanism for FPV camera using CAD/CAM systems
Holuša, David ; Fiala, Zdeněk (referee) ; Slaný, Martin (advisor)
This diploma thesis provides a comprehensive proposal of stabilization mechanism for sensing and FPV camera for remote controlled propeller plane. Summarizes the current human knowledge milestones in the field and describes the current state of knowledge and the market situation. Taking into account all acquired knowledge the author then describes two different design proposals outlining its related processes, such as manufacturing, electronics installation and commissioning.
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