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Evaluation of Surface Texture Profile Parameters and Verifying of Conformity with the Specification in the Drawing
Pospíšil, Lukáš ; Slaný, Martin (referee) ; Sámelová, Vendula (advisor)
The work is focused on the comparison of surface texture evaluation methods by profile method. The methods of the standards EN ISO 4288 and EN ISO 14 253 are considered. The paper shows why it is necessary to change the standards for the evaluation of surface texture, what are the positives of one and the negatives of the other standard. The methodology for the evaluation of surface roughness parameters is also explained, taking into account measurement uncertainties. A practical part is also included, where the function of the test parts is first described and then their manufacturing processes are described, where it was investigated whether a change in surface texture would be detected when the feed rate was increased. The parts are then measured with a contact profilometer, statistically processed and evaluated.
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Modification of the AFW150 paver design to enhance production efficiency with new technology incorporation
Šrenk, Vojtěch ; Kolomý, Štěpán (referee) ; Slaný, Martin (advisor)
The thesis focuses on the modification of the auger mechanism design on the AFW150 paver to improve its production efficiency and to use new production technologies in cooperation with Ammann. The thesis deals with the identification of available competitive solutions and evaluation of their parameters. Based on the obtained knowledge, the input requirements are defined, which the proposed variants reflect. These further influences the design solution itself, the mechanism assembly procedure, production design and analytical calculations of bearing, chain, and driveshaft stress durability. Changes in the manufacturing procedures and technologies used in the subassemblies of the mechanism are proposed in the thesis. The proposed and implemented changes are aimed at reducing production costs. The conclusions of the thesis then focus on the economic and technical aspects of the proposed solution and their evaluation.
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Preparation and design of the production of bevel gears using the Reverse engineering method
Šimáček, Daniel ; Sedlák, Josef (referee) ; Slaný, Martin (advisor)
This thesis addresses the reverse engineering of the assigned gears. The first part is dedicated to a theoretical review of the issues related to bevel gears, strength calculations of the gearing and defects that can occur during operation. This is followed by the production of bevel gears with helical teeth and the most common heat treatment of gears. The second part emphasizes the actual process of reverse engineering, describing the digitization of gears and their conversion into a solid body in CAD software. After obtaining the key dimensions of the gear set, an analytical calculation of the load capacity in contact and bending is performed, accompanied by a numerical calculation using the finite element method to determine the bending stress at the tooth root. Dimension verification is conducted through dimensional analysis in specialized software to potentially reveal deviations and inaccuracies in construction based on 3D scanning. The final part deals with the design of the technological process for the production of gears, followed by a technical-economic assessment of the preparation and actual production of the gears. The drawing documentation was created based on the 3D volumetric models generated from the scanned gears
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Comparison of riveting and welding of motorcycle trunks
Pirmajer, Richard ; Slaný, Martin (referee) ; Kubíček, Jaroslav (advisor)
The work is focused on the comparison of riveting and welding technology for motorcycle trunks. The basic material is EN AW 5754 alloy with a thickness of 1.5 mm. The trunks made of this material were provided by SW-MOTECH. In the theoretical part, research was carried out on aluminium itself, its properties, types of heat treatment and weldability options. Furthermore, the CMT welding method and the piercing riveting method, which were used in the production of the trunks, were described. In the practical part, samples from both trunks, welded by CMT method and riveted by piercing rivets, were examined. Furthermore, the specimens were examined for the size of the heat-affected zone, the depth of penetration, the presence of defects, and the quality of the joint, respectively. At the end, the methods were economically evaluated.
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Design of a milling fixture for four-axis CNC trimming of composite parts
Hibš, Dominik ; Slaný, Martin (referee) ; Zouhar, Jan (advisor)
This thesis deals with the design of a milling fixture for trimming of folding propellers for the company Mejzlik Propellers s.r.o. Firstly, an adequate HAAS DM-2 machine and UniCut Dron milling tool were selected. The cutting force was then quantified at 9.2 N. Once the cutting force was established, the clamping surface could be designed and the clamping force set at 317.3 N. After considering several fixture options, the final design was selected. The selected design was used to program the CNC machine in Fusion 360. A technical and economic evaluation followed, when the total price of the product was 41,671 CZK and the cost of machine cutting one propeller was 32.60 CZK, while the cost of manual trimming was 29.10 CZK
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Design of replicated production of the selected part and verification of shape and dimensions using optical 3D scanning methods
Šrenk, Jakub ; Fiala, Zdeněk (referee) ; Slaný, Martin (advisor)
This work is engaged in the prototype casting of resin with usage of reverse engineering technology and rapid protopyping. Surface quality and dimensional accuracy was optimized in a production process. The technology of 3D scanning, rapid prototyping, soft tooling and finishing methods is discussed in the theoretical part. Then in the practical part there is analyzed manufacturing process of the selected component for replicated production. 3D scanning, additive technology, soft tools and surface finishing methods were used in the manufacturing process. In the last step, the dimensional accuracy is evaluated and also the technology for serial and piece production was chosen.
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The unconventional Method of Cutting Water Jet
Prax, Ondřej ; Slaný, Martin (referee) ; Osička, Karel (advisor)
The master thesis contains a literature search dealing with the unconventional technology of water jet cutting. The first part is aimed to description of the water jet technology and shows the possibilities of controlling and awarding data for cutting. Follows the chapter about the influences of the input parameters to a surface quality and machining accuracy. The thesis also giving an account of ecological factors of the water jet cutting. The description of the whole technology for production of the sprocket is a part of the thesis. The last part of the thesis is solving the economics of the water jet cutting technology, especially for production of the sprocket with comparing dependency of the cutting conditions.
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Use of laser technology in conditions of job-order manufacture
Popela, Martin ; Slaný, Martin (referee) ; Osička, Karel (advisor)
The thesis is focused on theoretical analysis and physical description of laser beam technology. It deals with possibilities and concrete methods of laser technologies in perspective of metal machining and in detail it describes CO2 laser and its inclusion to the manufacturing process in concrete engineering company. Further it describes the components base and the construction technology of typal representatives. The thesis includes the proposition of solution of increase the productivity of the laser workplace and also technical and economical evaluation of this technology.
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Design and production of experimental axle part
Volfík, Jiří ; Slaný, Martin (referee) ; Zemčík, Oskar (advisor)
The content of this diploma thesis is a design of construction and selection of suitable material for upper-carrier part used for racing vehicle, produced by FDM 3D printing with the alternative option to replace an existing part, which was produced by conventional technique of CNC machining. Various versions of the experimental part are analyzed by FEM and compared in terms of safety coefficient with target to select the most appropriate construction design. The chosen version of the model is at the end compared with already existing part, which was also analyzed by FEM.
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