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Engineering optimization of the pressing process of the turbo molecular pump rotor
Baklík, Jiří ; Čekán, Václav (referee) ; Vosynek, Petr (advisor)
This thesis deals with the issue of press fitted joints and the optimization of the rotor pressing process of the mechanical turbomolecular pump nEXT300T. The press fitted assembly consists of three main parts (blade discs, hollow shaft, main shaft). The blade discs are press-fitted onto the hollow shaft, then this assembly is press fitted onto the main shaft. The optimization was performed by computational modeling based on the finite element method, using ANSYS Mechanical 2024 R1. The pressing process has been optimized to reduce production costs. The assembling process is more expensive due to liquid nitrogen, which is currently used for cooling the press fitted parts. Design of the pressing temperatures was carried out. For heating a temperature of 130 °C was determined. For cooling a temperature of-65 °C was chosen, this can be achieved using an industrial freezer. Due to the change in pressing temperatures, tolerance fields of the components were designed to ensure that the assembly can be assembled and that the press joint will not be lost under operating load. For the connection between the blade discs and the hollow shaft, a radial interference of 0,0585-0,0695 mm is required for functionality. For the connection between the hollow shaft and the main shaft, a radial interference range of 0,01-0,02 mm is functional.
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Optimization of the process of pressing balls into the injector body
Kadlecová, Petra ; Frýza, Josef (referee) ; Brandejs, Jan (advisor)
This thesis is focused on a pressing station as a part of the assembly line in the Bosch Diesel plant in Jihlava. The station provides sealing of a hole in the injector body by ball pressing in. By using several tests the thesis finds out a reason of large amount of waste pieces, checks how can pressing-speed change or lubricant change infuence the pressing process itself and compares capabilities of hydrolic vs. electric pressing machine.
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Analysis of state of stress in press and shrink fits
Dudek, Milan ; Řehák, Kamil (referee) ; Horníková, Jana (advisor)
This thesis is focused on calculation of overlap in press fit depending on vield strength. There are used methods of analytic elasticity. The counted values are implemented into the technologic process as updated technologic specification. The practical values of overlap depend on exactness of available technology. The evaluation is done at the end of thesis (economic evaluation as well)
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Optimization of the process of pressing balls into the injector body
Kadlecová, Petra ; Frýza, Josef (referee) ; Brandejs, Jan (advisor)
This thesis is focused on a pressing station as a part of the assembly line in the Bosch Diesel plant in Jihlava. The station provides sealing of a hole in the injector body by ball pressing in. By using several tests the thesis finds out a reason of large amount of waste pieces, checks how can pressing-speed change or lubricant change infuence the pressing process itself and compares capabilities of hydrolic vs. electric pressing machine.
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Analysis of state of stress in press and shrink fits
Dudek, Milan ; Řehák, Kamil (referee) ; Horníková, Jana (advisor)
This thesis is focused on calculation of overlap in press fit depending on vield strength. There are used methods of analytic elasticity. The counted values are implemented into the technologic process as updated technologic specification. The practical values of overlap depend on exactness of available technology. The evaluation is done at the end of thesis (economic evaluation as well)
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