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The Use of a Waterjet Technique in Finishing Operations
Jantač, Marek ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
The bachelor thesis deals with abrasive waterjet cutting. In the first part we dis-cuss the possibility of using an abrasive jet in various industries, its advantages and disadvantages. Furthermore, abrasive jet machining methods such as cutting, turning and milling. Then focuses on the technology at AWAC company, which were cut off samples for subsequent measurement. The aim of the measurements was to determine and compare the surface roughness of the samples were cut at different parameters.
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Influence of Grinding Tool Vibration on the Ground Surface Texture
Lukovics, Petr ; Vrba, Vladimír (referee) ; Tykal, Miroslav (referee) ; Pernikář, Jiří (advisor)
Thesis solves the problem of influence of variable process conditions during grinding on surface texture parameters, provides precision of measurement methods, assessed by laser interferometry measurement methods and piezoelectric measurement of vibration of technological equipment and processes using statistical methods the correlation between the amplitude of oscillation and on surface texture parameters. Further it provides the prediction of the impact of input parameters to the output parameters of the technological process for a long-term perspective.
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Measurement of roughness of the laser cutting edge
Pokorák, Milan ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
This thesis primarily deals with the laser material cutting and with the subsequent evaluation of roughness of the cutting edges. The thesis is divided in two parts, the theoretical part followed by the practical one. The theoretical section is concerned with the introduction to laser technology and with the basics of roughness measurement. It contains the history of laser, its construction and its physical principle. It also deals with the description of laser types and laser technologies. An important part is about the surface texture, which includes basic terms and methods of roughness measurement. The practical section is concerned with the comparison of roughness of the cutting edges. They were measured on S235JR steel samples with the value declared in ČSN EN ISO 9013 standard. This part contains the measurement results, the measured material and also machines and devices used. The overall evaluation of the practical measurement is mentioned in the final experiment outcome evaluation.
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Function and construction of burnishing tools
Hošková, Eliška ; Slaný, Martin (referee) ; Zemčík, Oskar (advisor)
Bachelor Thesis is aimed at chipless microfinishing burnishing rolled process. The thesis include principle of burnishing roller method, facilities and usage in view of requested properties of machina surface. The thesis include running conditions of burnishing roller, typem of tooling supplemented pictures of toolings made in Germany company Baublies AG accordance with using in production. Technical– economic evalution is described at the end of thesis.
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Modern finishing methods of implant processing
Večeřa, Tomáš ; Ohnišťová, Petra (referee) ; Píška, Miroslav (advisor)
This paper provides a general overview of joint implants and an overview of used contemporary materials and methods of fabrication of implants, including additive methods. More attention is paid to finishing methods of drag finishing and a new method of dry electropolishing used in DLyte system. In the experimental part, an experiment for analyzing and comparing the effect of DLyte system on a sample surface is proposed. Six samples of titanium alloy Ti6Al4V with different initial roughness are prepared. Their initial surface structure is studied.
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On the advanced production technology of UHMWPE joint implant part
Urbancová, Kateřina ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
This bachelor’s thesis is dealing with the problematics of individual joint replacements. The thesis summarizes the modern materials used for making artificial joint replacements, but it concentrates mainly on the plastic femoro-tibial part of the implant, usually manufactured from ultra-high molecular weight polyethylene. This material is the best choice when manufacturing the articulating surface of the joint replacement at the moment. The thesis pays attention to the polyethylene surface treatment, as the quality of the surface affects the wear of the plastic, which is critical for the implant lifespan. The thesis also focuses on analysis of the coefficient of friction of UHMWPE in contact with the titanium femoral component. Another part of this thesis is also a wear analysis of used tibial inserts made of UHMWPE and the mechanisms of wear.
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Influence of Grinding Tool Vibration on the Ground Surface Texture
Lukovics, Petr ; Vrba, Vladimír (referee) ; Tykal, Miroslav (referee) ; Pernikář, Jiří (advisor)
Thesis solves the problem of influence of variable process conditions during grinding on surface texture parameters, provides precision of measurement methods, assessed by laser interferometry measurement methods and piezoelectric measurement of vibration of technological equipment and processes using statistical methods the correlation between the amplitude of oscillation and on surface texture parameters. Further it provides the prediction of the impact of input parameters to the output parameters of the technological process for a long-term perspective.
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Optimization of laser fusion cutting of coated aluminum sheets
Pokorák, Milan ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
The thesis primarily deals with the optimization of laser cutting center for coated aluminium sheet cutting and with the subsequent comparison of measured results and a sample made using waterjet cutting. The thesis is divided in two parts, the theoretical part followed by the practical one. The theoretical section is concerned with the unconventional technologies used, with their general analysis, design, history and utilization for industrial appliances. Main parts of this thesis deals with classification of particular cutting principles and their specific description. The theoretical part contains also classificaton of aluminium alloy, description of surface texture measurement and explanation of basics terms used for roughness measurement. The practical section is concerned with the particular task solution and with all knowledge used for optimization and evaluation of laser cutting. This part contains the measurement results, the measured material, the machines and devices used and also the technical and economical evaluation of this thesis content. The overall evaluation of the laser cutting optimization of specific component is mentioned in the experiment outcome evaluation article.
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Data selection and optimisation of cutting conditions for progressive production technologies of drilling with a step drill
Barák, Vít ; Fiala, Zdeněk (referee) ; Píška, Miroslav (advisor)
The thesis contains theoretical analysis of drilling by twist drill focused on the step drill. The review includes description of the drill geometry, calculation of the basic parameters of drilling, including forces and process optimization. Following is manufacturing process and analysis of the monolithic step drill designed for the required hole parameters. The optimal cutting conditions are necessary to find for the correct function of the tool. The load values of the tool are accurately assessed using a piezoelectric dynamometer, thereby obtaining the overall progress of individual loads. The roughness of the workpiece is evaluated by the optical measuring device.
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