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Cutting force calculations for milling
Prášil, Vojtěch ; Polzer, Aleš (referee) ; Klíč, Daniel (advisor)
Milling is nowadays one of the most important machining operations, and therefore it is necessary to deal with the processes involved. The main objective of this work is to compare different methods of calculating cutting forces with the results obtained by direct measurement. The experiment was carried out by direct measurement on a piezoelectric dynamometer where the workpiece was clamped while milling on a CNC milling machine. The first technique designed to determine the cutting forces analytically was their calculation on machining calculators. Two mobile application calculators and one online web application calculator were selected for this purpose. The second technique was to calculate the cutting forces using formulas from the standards. The cutting conditions corresponding to the dynamometer experiment were inserted into all calculations. The comparison shows that for face milling, the calculations from the standards and from the Hoffmann MC calculator achieved acceptable values compared to the measured ones. However, the results calculated for milling the sides differ significantly from those measured.
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Possibilities of limiting unwanted phenomena during chip finishing machining
Handl, Jiří ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
The diploma thesis focuses on the possibilities of limiting undesirable phenomena during finishing chip machining. In the theoretical part, selected negative phenomena arising during turning are described and the possibilities of their limitation are investigated. In the experimental part, an analysis of the influence of cutting conditions from the recommended range of the cutting tool using the turning method is carried out. Specifically, the dependence of the cutting speed and feed rate on the size of the cutting force, temperature and resulting surface quality for two different materials is monitored. The obtained results serve to understand the issue and optimize the production process.
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Machining of titanium alloys
Müller, Peter ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
The bachelor thesis specifies the most important properties and production processes of titanium, categorizes titanium alloys and their properties. In the experimental part, titanium alloy Ti-6Al-4V blank was machined and cutting forces were measured, depending on selected feeds per revolution. Subsequently specific cutting force was calculated and compared with values given by the tool manufacturers.
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On the milling of ceramic materials
Rudel, Václav ; Slaný, Martin (referee) ; Píška, Miroslav (advisor)
In the diploma thesis dividing of ceramic materials is made, their bonds and other attributions, which define ceramic materials. There is also described how ceramic materials are manufactured and the thesis is including information about machining ceramic materials. In the experimental part sample of ceramic material R-S67K was machined by milling. During the experiment cutting forces were measured and roughness of surface after finishing, these data were finally evaluated.
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Testing of cutting parameters for UMCo50 machining
Jakubec, Thomas ; Kolomý, Štěpán (referee) ; Zemčík, Oskar (advisor)
The diploma thesis deals with the machinability of materials, the theoretical part describes the factors that have a dominant influence on machinability. The basic aspects according to which the machinability of the material and the wear of the tool are determined are also given here. The distribution of cobalt alloys is given here, including the UMCo-50 alloy, which is the subject of experimental research. It is an alloy for high-temperature use with good abrasion resistance and is used especially where other materials lose their mechanical properties due to the high temperature. The practical part followed the thesis of my colleague Ing. Peter Prno [1], which due to lack of time could not measure all the necessary quantities, resp. course of back wear for the remaining two cutting speeds. During the experiment, the wear of the tool back was monitored as a function of time at different cutting speeds in turning technology. The main goal was to determine the resulting tool life at the remaining cutting speeds and thus obtain a more accurate Taylor dependence. The turning forces, the quality of the machined surface and the formation of chips were also monitored during turning.
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Simulation verify the dynamic behavior of the portal machine tool
Danda, Libor ; Holub, Michal (referee) ; Vetiška, Jan (advisor)
This bachelor thesis deals with summary of simulation software for the simulation of the dynamic behavior of machines, creating a simulation model of the machine in MSC.ADAMS and experimental measurement of cutting forces. It also deals with dynamics simulations axis motion and deformation analysis of selected components of the machine. Finally, they are designed to be structural adaptations in order to increase the dynamic stability of the machine.
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Machining of vulcanizing molds from aluminum alloys
Kaška, Zdeněk ; Kalivoda, Milan (referee) ; Polzer, Aleš (advisor)
This diploma thesis is focused on the issue of deep drilling of vulcanization molds from various aluminum alloys. The work will describe a brief description of machined materials and tools for deep drilling, including the production of the vulcanization mold itself. Based on experimental measurements, the analysis of data and knowledge gained from deep drilling of aluminum alloys with different silicon contents will be performed. In the end, the individual components of force loads for both machined materials will be compared
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Cutting forces when drilling fibre reinforced composites
Režný, Tomáš ; Sedlák, Josef (referee) ; Humár, Anton (advisor)
This master´s thesis is focused on fibre–filled composite materials, their distribution, labeling, usage, development and production. The aim of this work is complex processing of acquired technical knowledge, and evaluation of technological rehearsals of drilling composite materials which are reinforced by glas fiber and prepreg in terms of the impact of the machined material, wor-king conditions and the tool, and its wear to the feed force value and torque.
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