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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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Production technology for a vacuum pump component
Horák, Adam ; Kalivoda, Milan (referee) ; Zemčík, Oskar (advisor)
The bachelor's thesis focuses on the design of a new or alternative technology for the component of the orbital scroll wheel 10i for the vacuum pump nXDS10i. The component is made of an aluminum alloy. The aim is to transition to a higher level of automation compared to the original technology, with the implementation of High-Speed Cutting (HSC) machining. The thesis includes an introduction and analysis of the component, including information about the alloy used, an analysis of the original technology, and its variants for optimization. This is followed by the proposal of a new technology and automation design, meeting the conditions set by the manufacturer of the component. The proposal of the new technology includes the design of a new technological process and clamping method. The thesis also includes a technical and economic evaluation of the original technology, the optimized original technology, and the new technology.
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Design of rationalization of distribution block production
Kobza, Tomáš ; Zemčík, Oskar (referee) ; Sliwková, Petra (advisor)
This thesis focuses on the proposal of rationalization of the production process of the specified part from the company WT-PRO Czech s.r.o. The introductory part is devoted to the description of the specified part and the analysis of the existing production process, focusing mainly on machining operations. Theoretical part is focused on CAD/CAM systems, machining technologies - milling, drilling and threading, which are essential for the production of the component. It also focuses on tooling materials and chucks. In the practical part, the rationalization of the production process is proposed, which concerns two machining operations. A machining centre is specified for these operations, for which new clamping, new tooling, operating instructions and NC codes have been designed in GibbsCAM. The resulting design is described in the new manufacturing process. Finally, a techno-economic evaluation was carried out.
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Study of the development of Alite crystallinity
Lakomá, Karolína ; Fridrichová, Marcela (referee) ; Dvořák, Karel (advisor)
The bachelor thesis summarizes current knowledge in the field of preparation and various influences on the structure of alite in triclinic modification. The work is mainly focused on the study of the development of crystallinity during heating and short isothermal endurance. Within the work, the production of pellets is optimized and the functionality of the experimental furnace for firing triclinic alite is verified.
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Design of production technology of a planetary gearbox carrier
Skopalová, Simona ; Dvořáková, Jana (referee) ; Sliwková, Petra (advisor)
The diploma thesis deals with the technological design of the production of the carrier of the planetary gearbox. The thesis describes the used production technologies, which include turning and milling. Furthermore, the thesis is focused on the technological design of the production of a part from a semi-finished product in the form of a bar and forging, the choice of machine and tool equipment and technological-economic evaluation. At the end of the thesis, these variants are compared and evaluated.
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Design of a single-purpose clamping device for mass production
Okénka, Jan ; Michalec, Michal (referee) ; Svoboda, Petr (advisor)
Bachelor thesis deals with the problem of clamping of a complex cast part on a four-axis CNC machine in serial production. The aim was to design a clamping jig to reduce the total number of clamping operations required. A total of 4 concepts were presented and the best design was selected according to the criteria. The proposed solution is a hydraulic centering vise, equipped with a center piece to locate two workpieces, and two rotating jaws that adjust by the workpiece. A series of 250,000 pieces per year can be fulfilled with this fixture. The jig can be easily converted to another type of production by changing the jaws and the middle part. The necessary clamping force for secure clamping was also calculated and it was verified by finite element analysis that no permanent deformation of the workpiece would occur during clamping. The work also includes a review of commercially available jigs, aluminium alloys for die casting and selected CNC milling machines.
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Hydraulic losses of electric inverter coolers
Sněhota, Daniel ; Kracík, Petr (referee) ; Toman, Filip (advisor)
This bachelor's thesis compares two electric inverter heat sinks with the same geometry but manufactured using different technologies. The first part briefly discusses the categorization of heat exchangers. The second part describes the differences in the manufacture of the heat sinks: one through milling and the other through SLM 3D printing. Subsequently, the achieved surface roughness of both heat sinks is measured using a microscope. Finally, pressure loss in both heat sinks is measured, and the acquired data is evaluated. These results enhance our comprehension of the impact of manufacturing technology and surface roughness on pressure loss in small heat sinks.
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The design of the production of the component on a CNC milling machine
Krejsa, Jakub ; Chladil, Josef (referee) ; Kalivoda, Milan (advisor)
The bachelor's thesis focuses on the production of a component using a CNC milling machine. As part of this work, the entire manufacturing process was assembled. The assembly of the manufacturing process included the selection of raw materials, the choice of production machines and tools, and the creation of a technological procedure. Subsequently, an NC program was created, which was used solely for the purposes of the bachelor's thesis. In the conclusion, the production of the selected component is evaluated.
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Application PowerMILL 2020 CAM software for machining
Šrom, Jakub ; Potanko, Andrej (referee) ; Polzer, Aleš (advisor)
The content of this bachelor's thesis is the application of CAM software PowerMILL in machining with consideration of production on a five-axis milling center Hermle, equipped with a Heidenhain control system. The thesis includes a brief analysis of significant programming functions of the CAM software and the machine control system. The practical part deals with a model considering problematic components manufactured for the aerospace industry. Furthermore, the thesis focuses on the selection of suitable materials used in the aerospace industry, the application of machining paths in the CAM software with a comparison of possible strategies and tools used, and the subsequent verification of the machining program by simulation and analysis of potential component deformations caused by cutting forces during machining using ANSYS software. The conclusion of the thesis is dedicated to testing the implemented post-processing of machining paths through simulation in the machine's control system.
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Evaluation of the machinability of material produced by additive manufacturing
Bílek, Richard ; Drbal, Martin (referee) ; Kolomý, Štěpán (advisor)
This bachelor thesis evaluates the machinability of high strength maraging steel M300, which is produced in three types of samples. Two samples were additively manufactured by Selective Laser Melting, one of which was subsequently heat treated. The third sample was produced by conventional rolling. Testing was carried out by milling under different cutting conditions. In the practical part the resulting chips were taken and hardness of individual samples, then the individual cutting forces during machining, surface roughness and the flank wear were measured. The measured data and chips morphology were further analysed and evaluated. The output of the work is a recommendation of the appropriate cutting speed for machining the additively manufacturing maraging steel M300.
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