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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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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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Additive manufacturing of fixtures for assembly and pressing by FDM
Gregora, Jan ; Vespalec, Arnošt (referee) ; Slavíček, Jakub (advisor)
This bachelor thesis dealt with the design of fixtures for prototype assembly of thermoregulating modules. One of the aims of the thesis was to evaluate the suitability of using FDM printing for the production of prototype fixtures. FDM fixtures are intended to replace the metal fixtures used to date. The motivation for the use of additive manufacturing was to make production cheaper and faster within the prototype department of Schaeffler Production CZ, s.r.o. The effect of the surface loading on the 3D printed PETG material, which was chosen as the construction material within the scope of the work, was measured. The results of this measurement and the findings from the research part were used for FEA analysis and design of the product. The comparison of the cost-effectiveness and the speed of the prototype fixture production clearly shows that the use of additive technologies is better.
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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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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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