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Cutting force analysis when drilling with twist drill
Hon, Pavel ; Humár, Anton (referee) ; Píška, Miroslav (advisor)
Theoretical part of this project contains basic characteristics of drilling technology, shows summary of drilling technologies and tools used for drilling, detailed description of twist drill, forces and loads analysis when drill, twist drill stress analysis. In experimental part of this project there are some investigations on twist drill geometry CZ001 made by company NASTROJE CZ, s.r.o. Cutting edge geometry and web thickness is measured on 3D scan of this drill and the results are compared to conventional products. Course of moment of cutting and course of thrust force is done by experiment where the recessed hole was drilled. Course of both loads is compared to long-term results on conventional drills. As application of the achieved results the cutting force position is calculated and stress and deformation analysis is performed.
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Research and development of surface modifications of bearing steels by means of ion nitridation
Klimčáková, Kateřina ; Klakurková, Lenka (referee) ; Doležal, Pavel (advisor)
Basic requirements placed on rolling bearing components include the high fatigue limit, the wear resistance and the corrosion resistance. As full production of bearings from materials with these attributes would be quite expensive, surface modifications are used to improve mechanical characteristics. This thesis deals with application of layers to the bearing steel by means of ion nitridation. It studies effects of input conditions of the ion nitridation and of the surface condition on tribological characteristics of the bearing steel with the above mentioned finishing. The study employed the interaction light microscopy, the scanning electron microscopy equipped by energy dispersive chemical microanalysis, the hardness measurement by Vickers, the glow discharge optical emission spectroscopy, and methods of the phase analysis by means of the X-ray diffraction were used.
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Design and Construction of an Effusion Cell for Growth of Ultrathin Layers
Křápek, Ondřej ; Voborný, Stanislav (referee) ; Mach, Jindřich (advisor)
This Bachelor's work deals with the design, documentation and construction of effusion cell for deposition of ultrathin layers of various materials in conditions of ultrahigh vacuum. After fabrication and assemblage the effusion cell was placed to an ultrahigh vacuum chamber (p ~ 10-5 Pa) where the first testing deposition of a silver ultrathin film on Si (111) substrate was performed. This sample was studied by X-ray photoelectron spectroscopy and atomic force microscopy.
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Separation of rigid particles from heterogeneous suspension
Prax, Ondřej ; Debreczeni, Ondřej (referee) ; Pochylý, František (advisor)
The bachelor thesis contains a literature search dealing with the separation of solid particles from a heterogenic suspension. The first part is aimed at separation methods. Then, a chapter follows dealing with separation devices, which are used in waste water treatment plants. A more detailed description of the separator used for the separation of sand from waste waters is part of this paper. The described device serving to separate solid particles from a suspension uses the combination of sedimentation and separation methods. To visualize the separator a 3D model in Autodesk Inventor Professional 9 device was used in the presented paper.
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