National Repository of Grey Literature 424 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
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.
Rationalization of holder production
Šidlák, Jaromír ; Zemčík, Oskar (referee) ; Sliwková, Petra (advisor)
This thesis presents a proposal to replace the weldment of a mount with a workpiece. The mount is part of a designer light and 200 of them are manufactured every year. The mount material has been changed from stainless steel 1.4301 to aluminium alloy EN AW 6082. Design modifications have been made to the part to improve its functional properties and reduce machine time when it is made. A semi-finished product from a cold-pressed and drawn round bar according to ČSN EN 755 – 1 was determined and its size was calculated. The degree of material usage was then determined, as was consumption of the material for the year’s production, which amounts to 6 bars 3 metres long. Machinery from the company’s portfolio was proposed for the modified part. The majority of the part is produced on a KL 285 CNC turning centre. Appropriate machining tools were chosen for the selected machines. The work includes the complete technological production process as well as the CNC programs for machining the part. They were created directly at the machine using the Sinumerik 828D control system, specifically its Shopturn superstructure. After debugging the program, the necessary machining tools were placed as appropriate in the machine. Prototypes were then made to verify that the technology was designed correctly and that the parts were manufacturable.
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.
Production technology for parts of a winder gearbox
Riasnyi, Artem ; Sliwková, Petra (referee) ; Zemčík, Oskar (advisor)
The thesis focuses on the design of the production of two key gearbox components – the output shaft and the gear wheel. The aim was to optimize the production of these components through the selection of suitable machining equipment, cutting tools, and cutting conditions. Two production variants with different replaceable carbide inserts for lathe knives were compared for the output shaft. For the gear wheel, variants with different drills and carbide inserts for groove pinning were compared. The results indicate that the first variant of the output shaft production is advantageous in terms of both time and costs, whereas for the gear wheel, the second variant is advantageous in terms of time. Further optimization of cutting conditions is recommended, along with consideration of alternative tool selection to further improve efficiency and reduce production costs.
Effect of PLA and PET-G composite filaments humidity on a 3D FDM printed part
Továrek, Marek ; Dvořáková, Jana (referee) ; Zemčík, Oskar (advisor)
The subject of the thesis is to find out what effect filament humidity has on FDM printing. First, the research of the chosen issue will be analyzed with a focus on 3D printing. Introduction to 3D printing methods, with a primary focus on the description of the FDM method with the description of filament humidity. In the experimental part, the tested materials will be selected and the procedure of the experiment will be proposed. The experiment will focus on drying, wetting filaments and printing from the wet filament. The designed samples for the tensile test will be printed. Individual samples will be printed at different humidity levels and at the end the effect of humidity on tensile strength will be compared.
Increasing of fatigue life of a ball pin using roller burnishing
Bastl, Václav ; Kolomý, Štěpán (referee) ; Zemčík, Oskar (advisor)
Bachelor’s thesis carried out in cooperation with THK Rhythm Automotive Czech a.s. is focused on the problematics of fatigue life of ball pins in a car‘s suspension. As an option of increasing this parameter, roller burnishing is the proposed technology of surface treatment on the ball pin. Rolling parameters are designed, and fatigue tests and evaluation of the measured values are performer on the subsequently modified pins.
Evaluation of washing effect on material properties after 3D DLP printing
Uvíra, Dominik ; Jaroš, Aleš (referee) ; Zemčík, Oskar (advisor)
This thesis focuses on the influence of washing on the mechanical properties of 3D DLP printed parts. The aim of the thesis was to experimentally determine the impact of washing agents with different wash durations on the mechanical properties of 3D printed parts using DLP technology. The research describes the devices and materials used. Furthermore, an analysis of washing 3D DLP printed parts is conducted, including a description of polymer dissolution, types of washing agents, and washing methods. Based on the research, materials were selected, including Standard resin, ABS-like resin, and Tough resin. The used washing agents are IPA, Simple Green industrial degreaser, DPM, and a special uncured resin remover called EasyClean. Samples were produced on the DLP 3D printer Anycubic Photon D2, and printing profiles were established based on the research part and own calibration. In the first experiment, the effectiveness of the agents in removing uncured resin was monitored. This was followed by an experimental evaluation of the tensile properties of the prepared samples. Furthermore, the notch toughness of each material was evaluated. In both cases, an analysis of fracture surfaces was conducted. Based on the achieved results, optimal washing durations were determined for all material and rinsing agent combinations, and areas of application were recommended. Subsequently, a custom rinsing agent combining low cost and good mechanical properties was proposed. The final part of the work consists of an economic evaluation of the various rinsing agents, resulting in specific recommendations for purchasing rinsing agents and rinsing duration.
Design of a group milling fixture for clamping components
Kalous, Jan ; Dvořák, Jaromír (referee) ; Zemčík, Oskar (advisor)
The thesis deals with the design of a group milling jig for four different shaped components. These parts are components of a baking line and are designed to clamp baking matrices for wafer production. The semi-product for all the parts is a casting made of EN-GJS-400-15, cast iron with spheroidal graphite. Machining on a horizontal milling centre MS NH5000 DCG from DMG Mori Czech s.r.o. was chosen to produce all four parts. A list of tools and gauges was made. Subsequently, a technological process was created for the selected part with the designation HAAC-62836-001. Then the cutting forces from the individual cutter inserts, clamping, and friction forces were calculated to verify that the machined piece could move in the jigs. This thesis includes calculations of both jigs and evaluation according to the technical aspect.
Production of a working replacement part of a blender using the FDM printer
Bruštík, Adam ; Kupčák, Radim (referee) ; Zemčík, Oskar (advisor)
This Bachelor thesis is devoted to designing variants of kitchen appliance gearing, subsequent production via FDM 3D printing method and the evaluation of its technical and economical aspect. The research in a theoretical part briefly describes an issue of worm gears and FDM method. The selection of the most suitable variant is assessed on the basis of the results achieved with FEM.

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