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Design of grinding spindl
Slavíček, Josef ; Jaroš, Zdeněk (referee) ; Blecha, Petr (advisor)
The subject of this bachelor thesis is the construction of grinding machine spindle. The work is divided into two main parts. The first part is engaged with the general description of the spindles, their design components, the accuracy requirements and modern trends in the spindles. The second part is engaged with the design calculations of selected grinding spindle. The conclusion of this work is drawing and 3D model of that selected spindle, is created by using Autodesk Inventor 10.
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Mechanical design of 3D printer head for manufacturing of concrete parts
Slavíček, Jakub ; Brandejs, Jan (referee) ; Paloušek, David (advisor)
This bachelor thesis deals with a structural design of modular printer head used for 3D print of cementitious mixture. Printer head is designed for continuous printing of cementitous mixture with added crushed stone and accelerator. The main function of printer head is extrusion of the final mixture with established print parametres. In the thesis, the research was conducted into existing 3D concrete printing methods, possibilities of concrete transportation and material characteristics. The analysis is carried out in the second chapter, where the knowledge from the first chapter is evaluated and factors influencing the extrusion of concrete are defined. The design part of thesis specifies basic printing parametres and contains different alternatives of solution. The chosen conceptual solution is elaborated in detail and construction solution includes verifying calculations.
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Measurement of machine tool spindles by means of non-contact sensors
Slavíček, Josef ; Knoflíček, Radek (referee) ; Holub, Michal (advisor)
The goal of this work is to propose a suitable methodology for measuring and evaluating the geometric precision of spindle rotation. Identification and classification of errors while moving spindle. Part of this work should be also a program in LabVIEW that evaluate the errors in the motion of the spindle. Practical functionality of the proposed measurement system should be tested at selected MCV754 QUICK machines, lathes SV 18 and milling machine FNG 32. For processing of the results should be used basic statistical procedures. This thesis includes research in the field of machine tool spindles and different ways of measuring spindle motion deviations from the ideal path. There is also included the effect of sensors to measuring spindle running accuracy and identification of suitable sensors applicable for this application. There is a proposal of measurement of selected machinery, and defines all the components required for measurements that were used during spindle running precision measurement. Part of this work is a basic description of the program developed for evaluating errors in the motion of the spindle.
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Recent Trucks Technical Solutions
Slavíček, Jakub ; Svída, David (referee) ; Ramík, Pavel (advisor)
Bachelor’s thesis is about technical solving of goods carriers. There is defined kinds of trucks by purposes of using. There are described carriages, gear units, motors, cabins, safety factor, electrical systems. There is vision of future. Knowledge of professional driver are used.
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Integrated Management System
Slavíček, Jakub ; Krásová, Anna (referee) ; Koška, Petr (advisor)
This thesis deals with the introduction of integrate management system. Spe-cifically, the introduction of quality management and environmental management systems. The practical part includes a review of the current status of compliance with the requirements of standards ISO 9001/2009 and ISO 14001/2005, a registry of legal requirements, identifying environmental aspects and their evaluation in terms of significance and identification of emergency danger situation.
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Mechanical design of 3D printing head for concrete mixtures
Slavíček, Jakub ; Němeček, Stanislav (referee) ; Paloušek, David (advisor)
This diploma thesis deals with a design and manufacture of an active print head used for 3D printing of concrete mixtures. The aim is to ensure functional parameters of the print head at a minimal mass. Extrusion of the material from the print head is ensured by a screw conveyor, shaping of the material is carry out by a rotatably mounted nozzle provided with trowels. The dimensioning of the main elements of the print head is based on the parameters measured during tests with the older version of the print head and on the FEM analysis. The print head was manufactured and is able to extrude concrete mixture with an admixture of aggregate (fraction 4–8 mm) at a rate of 0,5–2 m3•h-1. The weight of the print head is 16.4 kg, which is 30 percent less than an older print head weighed. The manufactured print head was tested during the printing of a real object and met all the required parameters. The print head is ready for implementation in a machine providing large-scale printing of parts in the construction industry.
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Methods for surface improvement of components processed using Selective Laser Melting
Krontorád, Martin ; Slavíček, Jakub (referee) ; Malý, Martin (advisor)
Power bed fusion is advantageously being used for manufacturing of not only critical automotive and aerospace components, but even for biomedical implants. As-built components suffer from poor surface quality. The quality of surface directly affects fatigue behaviour. Some of the commonly used surface finishing methods are not suitable for additively manufactured components with intricate geometries. This bachelor thesis is focused on description of suitable methods for such components. The centre of attention is on Ti-6Al-4V and Inconel 718. The impact of each one of the methods on mechanical properties is discussed. Lastly a procedure of surface finishing for model cases of theoretical components is proposed. The main takeaway from this paper is understanding the obstacle that poor quality of surface to additively manufactured parts is and different solutions, to this problem, that described methods offer. Subsequently a critical analysis of the usability of the methods and help with designing a surface treatment procedure is offered.
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Development of WAAM process parameters for thin-walled components made of magnesium alloy AZ61
Šváb, Čeněk ; Němeček, Stanislav (referee) ; Slavíček, Jakub (advisor)
The thesis deals with the development of WAAM (Wire Arc Additive Manufacturing) process parameters for thin-walled parts made of magnesium alloy AZ61. The aim of the thesis is to find suitable process parameters and describe their influences on the welding process. To achieve this goal, these parameters were experimentally tested. It was found that the parameter of boost phase current and the duration of its application have the highest influence on the weld geometry. The stability of the welding process was then influenced by the electrode feed rate during the boost and burn phases. Based on these results, a final set of parameters was created, which successfully welded a thin-walled part composed of 50 layers and reaching a height of 130 mm.
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Design of a mechanism for cleaning magnesium welding wire
Seidler, Filip ; Jaroš, Jan (referee) ; Slavíček, Jakub (advisor)
The bachelor's thesis dealt with the design of the mechanism for cleaning magnesium welding wire. In the first part of the work, a research was made for possible solutions and commercially available devices for cleaning wires. The applicability of the individual solutions was subsequently evaluated and, based on the evaluation, a custom solution meeting the specified conditions was proposed. The actual design used the principles resulting from the research of existing and unconventional solutions, which it further develops, thus managing to fulfill the requirements of the main and secondary objectives of the assignment. The design made it possible to remove impurities and corrosion from the surface of the magnesium welding wire meeting the specific conditions of the assignment.
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