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Efficiency Improvement of Grinding Technology Using Construction Adjustments
Koláček, David ; Prokop, Jaroslav (referee) ; Sedlák, Josef (advisor)
This thesis is oriented to technological and design direction. It is focused on the upgrading of existing machinery from a structural perspective. There is studied the impact of design modifications to the existing production process from a technological point of view. This thesis is specifically concentrated on the technology division of the material, especially on the technology cutting-off in dry condition. There is examined the ability of self-sharpening cutting tools and the quality of the final product under varying input conditions. The job is finished by the carried out techno-economic evaluation, where are compared the costs of the structural adjustments in comparison with mechanical equipment, that could be purchased on the market. The thesis is finished with overall analysis of the optimal efficiency of the production process.
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Replacement of human bones by synthetic materials using 3D printing
Svoboda, Štěpán ; Sedlák, Josef (referee) ; Zemčík, Oskar (advisor)
The thesis is divided into three main parts. The first section summarizes the theory of the issue. Here we are unified theoretical information about the various possibilities of different approaches. The result of this part is therefore a general summary of theoretical possible procedures of creation bone implant, where each are listed the advantages and disadvantages. The theoretical part also contains information that ultimately, in practice, the author did not use. But his idea was to create a comprehensive look at the issue from several angles. The second part uses theoretical knowledge from the previous set of information as a basis for defining the steps required to successfully manage the issues of bone 3D printing. The third part will follow the guidelines of both previous and focuses on practical making bones and subsequent evaluation method chosen. There are discussed various steps that led to the final conclusion, making bones and work is then focused on the evaluation of the success of selected procedures and recommendations for future action.
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Analysis of Tool Wear with Cermet Cutting Edges During Turning
Kunkela, Ondřej ; Kouřil, Karel (referee) ; Sedlák, Josef (advisor)
This thesis focuses on comparison of cermet cutting materials, which are used to manufacture reamer cutting edges. It contains review of current market reamer tools and suppliers of cermet semi-finished products. Cermet cutting tips were used to machine parts from carbon steel and analysis was made to compare wearing of the tools from different suppliers. This test was conducted on turning machine in working conditions typical for reaming. During this test there were taken notes on the wear of the tools and surface roughness of the part. The output of this is work is data processing, which indicates durability of each tested cermet.
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Manufacturing technology of centrifugal compressor for small jet engine
Remer, Radim ; Sedlák, Josef (referee) ; Zouhar, Jan (advisor)
This thesis deals with redesigning of the current technological manufacturing process and subsequent production of a centrifugal impeller of a small tubojet engine. Thesis is divided into three main parts. First part deals with the theoretical background of the turbojet engines and the centrifugal impeller. Next part is focused on the proposed manufacturing technology of the centrifugal impeller using machining. Final part of the thesis deals with evaluation of the achieved goals.
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Cemented carbides and theirs effective use
Dembek, Jiří ; Sedlák, Josef (referee) ; Humár, Anton (advisor)
This diploma thesis is aimed on cutting tools made of cemented carbides. It characterizes marking, production and properties of non-coating and coating cemented carbides and describes the latest trends in coating. Target of this diploma thesis is comparison of assortment of two important world’s producers and one Czech producer in term of used productive technologies, products microstructure, coatings types, coatings methods and possibilities of their usage. Cutting data were evaluated and compared from obtained technical knowledge, which were recommended by chosen producers for effective turning application of their cutting tools. Recommended cutting speeds were found out for specific type of cutting material according to ISO, width depth of cut and for specific values of feeds per revolution.
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Analysis of cutting tests on the performance of axial tools
Fasora, Jan ; Nečesánek, Emil (referee) ; Sedlák, Josef (advisor)
This master thesis deals with a cutting test on performance of an innovative high-speed steel twist drill. The theoretical part of the thesis is focused on the analysis of individual influences on the drilling process, the emphasis is placed on the influence of tool geometry. The main experimental part of the thesis deals with the influence of twist drill geometry on the cutting performance, specifically influence of the point angle and lip angle on the drilling process. The workpiece material is austenitic stainless steel. The results achieved in a completed experiment are used in a cutting tool development. The achieved results show that a layer of material with higher hardness situated on workpiece can increase a drill holes quality up to twice. To achieve a stable drilling process it is needed to obtain the values of the point angle and lip angle depending on the each other. In general, the recommended application range of these angles while drilling austenitic stainless steel can be 138° to 142° in the case of the point angle and 7° to 10° for lip angle.
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Cutting Tests of Insert for Turning Structural Hardened Steel
Šolc, Michal ; Pokorný, Zdeněk (referee) ; Sedlák, Josef (advisor)
The thesis deals with the wear of replaceable inserts during the turning of structural hardened steel. The theoretical part describes a brief characteristic of turning technology, force loading on tools and tools used in turning. Moreover, it contains an analysis of the chemical composition of the machined material, its microstructure and microhardness. Machines and equipment used for the experiment and their specifications. The experimental part of the thesis describes the method of measuring and evaluating of tool wear, followed by the cutting tests themselves, documenting of the result and their evaluation. The conclusion of the thesis is the processing of measured data, the evaluation of achieved results and the proposal of further steps to improve the process.
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