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Pneumobile car-body design for robotic fabrication
Vevera, Tomáš ; Nevřela, Petr (referee) ; Škaroupka, David (advisor)
This thesis solves design of the pneumobile bodywork designated for robotic manufacturing using curved folding method. The thesis evaluates possibilities of this technology and issue of specific behaviour of CCF geometries. With intention to simplify and speedup the proces of designing, the suggestion of software tool for CCF geometry simulation is proposed. Obtained pieces of knowledge are being used in creating the prototype of designed solution using curved folding.
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Supportless 3D print by 6-axis robotic arm
Krejčiřík, Petr ; Horák, Zdeněk (referee) ; Škaroupka, David (advisor)
This diploma thesis deals with the solution 3D printing by KUKA robotic arm without realization of supporting structures. The 6-axis KUKA KR 60HA robotic arm allows adjusting 3D printing strategies compared to classical 3D printing concept. The first part of the diploma thesis is about the identification of the current state of knowledge, especially the state of the experimental device for the robotic 3D print. To improve quality of the printed is necessary to modify the printing head and develop the suitable calibration principle. Special printing strategies were designed to rearch the 3D printing overhead volumes without creating support structure. A special alghoritm in the Grasshopper evnironment was developed for generating 3D print trajectory on the body surface. For the quality improvement it is necessary to optimize the process parameters. The final step is experimental 3D printing with the evaluation of surface dimensions, geometric precision and layer coherence in various printing strategies.
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Surface finishing of plastic parts
Nguyen, Manh Thanh ; Škaroupka, David (referee) ; Paloušek, David (advisor)
The main topic of this barchelor thesis is surface finishing of plastic part manufactured by FDM technology. The thesis includes experimetal part which aim is to test various possibilities of surface finishing by acetone vapour etching. Two different samples of ABS materiál will be used for testing. Changes of dimension and geometry will be observed.
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Design of screw extruder for robotic 3D printing from pellets
Machač, Radim ; Škaroupka, David (referee) ; Křivohlavý, Petr (advisor)
The goal of this bachelor thesis was to design a screw extruder suitable for 3D printing, which will be able to process cheap plastic pellets instead of filament. The first part of the work is devoted to the extruder components, the extrusion process and the use of this polymer processing technology in the design of a screw extruder for 3D printing. An extruder model is created with regard to minimum dimensions and weight. During the design, requirements were set for ease of maintenance. The result is an extruder that enables both large-volume and small-volume printing, which, according to the calculations, is equal to the printing speed of ordinary 3D printers. This work will serve in the area of the usability of cheap plastic pellets as an input material for 3D printing. With its content, it also contributes to the development of screw extruder designs suitable for use in laboratories or industry.
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Design of auxetic structures for the 3D print
Sobol, Vítězslav ; Škaroupka, David (referee) ; Červinek, Ondřej (advisor)
Behavior in which the material expands in one direction and in a perpendicular direction under tensile loading is called auxetic and is associated, e. g. with increased indentation resistance. Auxetic behavior is mainly due to the typical geometry of the internal structure. Therefore, it can be achieved by a unique arrangement of inner micro-lattice structure. Through additive technologies such as Selective Laser Melting (SLM), it is possible to manufacture such complex geometry. This bachelor thesis deals with the design of a spatial micro-lattice structure that will exhibit auxetic behavior and can be made by the SLM method. Based on an extensive research on the topic of 2D and 3D auxetic structures, a new type of auxetic structure was designed. The manufacturability was verified by making several samples in different dimensional configurations. Auxeticity and mechanical properties were subsequently tested using a drop test. By evaluating it, it was possible to determine the influence of dimensional parameters on the overall behavior of the structure.
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System of large-scale 3D printing of products from bar structures
Vašátko, Marek ; Němeček, Stanislav (referee) ; Škaroupka, David (advisor)
This thesis deals with the design of a system for the production of lattice spatial structures from polymer materials printed by a robotic arm. The aim of the thesis is to design a suitable manufacturing system in general and to experimentally verify the production of products on the current form of the system. Using compression tests to determine the load carrying capacity of the fabricated lattice structures and compare it with a computational model of the ideal geometry. In general, the parts of the manufacturing system were designed and experimental measurements of compression tests on fabricated specimen structures were carried out. The first results of compression tests of such fabricated structures for two cell topologies were obtained. The accuracy between the experiments and the computational model is comparable to the results in the current literature. Better results were obtained in the areas of repeatability of the obtained load values. The system is a combination of HW and SW solutions providing 3D printing of large-scale lattice structures for large volume parts and represents an incremental improvement of partial properties.
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Design of the extruder for additive manufacturing of highly-filled thermoplastics
Kočař, Jiří ; Koiš, Jiří (referee) ; Škaroupka, David (advisor)
The diploma thesis is concerned in design and realization of an experimental extruder for high-filled thermoplastic (Polybet) extrusion, which is a part of an assembly attached to the robotic arm. The result of the work is a device, that is be able to additively and continuously apply layers of Polybet. The s worm threaded extruder with modified parameters is designed with the ability to extrude the thermoplastic melt with additional fillers (sand, glass). The dimensions and weight of the extruder were minimized within limits of the robotic arm carrying capacity. The design of this thesis is an extruder which is able of large-scale additive printing of Polybet with binders (PET or PP). Another result is a mathematical model of material flow and power consumption, adjusted by results of experiments. The thesis is a research of a new part of additive production, where two types of waste material are used for the construction industry. The thesis examines the influence of fillers on power and flow rate through the extruder.
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