|
|
Cyclic plasticity and low-cycle fatigue resistance of materials prepared by the ColdSpray method
Brůža, Jaromír ; Šulák, Ivo (referee) ; Zapletal, Josef (advisor)
In the theoretical part, the diploma thesis focuses on Cold spray technology and parameters affecting the efficiency and quality of deposition. Next, there is an introduction to the fatigue process of materials. The theory is concluded with a summary of the current knowledge regarding materials created by Cold spray technology in the field of fatigue. In the practical part, volumetric bodies were created from the material EN AW7075. Specimens for tensile and fatigue tests were cut from the bodies by electrosparking. From the material and powder, metallographic cuttings were created for the determination of porosity using Archimedes’ principle, hardness according to Vickers and evaluation of EDS and EBSD analysis. The basic mechanical properties were determined from the tensile tests and the Wöhler-Basquin parameters were determined from the fatigue tests along with the life curve. Subsequently, a fractographic analysis of fracture surfaces using SEM took place.
|
|
|
Parametres of 3D printing of concrete
Navrátil, David ; Szabari, Mikuláš (referee) ; Kočiš, Petr (advisor)
The bachelor thesis deals with the investigation of 3D printing parameters of concrete in the context of minimizing imperfectly homogenized mixtures with known printing methods. The first part of the thesis is devoted to the research, which is divided into three parts. In the first part of the research is a topic dealing with known technologies of 3D printing from concrete. The second part of the research is devoted to the description of the individual components of 3D printing equipment. As the last part of the research is the determination of basic parameters of 3D printing from concrete, including their description. The second part of the thesis starts with the system analysis and formulation of the problem. This is followed by a listing of the identified parameters of the printers offered by the selected companies. Then, a multicriteria analysis was performed to decide on the printer with optimal parameters, which are associated with minimizing the waste of the imperfectly homogenized mixture. The thesis concludes with a discussion of the possible continuation of the problem, together with its own recommendations for practice.
|
|
|
Design of Alternative Production of a Part using 3D Printing Technology
Verner, Tomáš ; Zeman, Břetislav (referee) ; Sedlák, Josef (advisor)
This bachelor thesis deals with the design of an alternative production of a part (sprocket cap). The aim of the thesis is to design an alternative production of the part using 3D printing, to simplify and cheapen the production. The theoretical part includes a description of the existing manufacturing technology and the additive technology (FFF) that will be used for printing the part. Another part of the theoretical work is devoted to the description of additive materials and the subsequent selection of a suitable material, which is PETG material. The practical part of the thesis is devoted to the structural redesign of the part for 3D printing technology and subsequent printing and testing. The thesis concludes with a techno-economic evaluation. The part printed using 3D printing technology performs better from a technical and economic point of view than the original part.
|
|
|
Design of DLP/SLA 3D Printer
Drcmánek, Filip ; Křenek, Ladislav (referee) ; Sládek, Josef (advisor)
This bachelor thesis is dedicated to the design of a DLP 3D printer. The main objective of the thesis is to design a DLP 3D printer that is going to emphasize safety, ergonomics, and user-friendliness. The design is based on the conducted analyses, thanks to which were discovered possible shortcomings of existing DLP 3D printers. These shortcomings create room for innovations, which have been made mainly in sub-elements of the design. Part of the final design includes elements that will simplify the handling of finished prints and increase safety when handling the device. The design also respects ergonomic requirements and the dimensions of the human body. The designed product can find application in the production of prototypes, in dentistry, jewellery and last but not least for hobby users.
|
|
|
Surface roughness of lattice structures produced by SLM technology
Bóssi, Adam ; Malý, Martin (referee) ; Jaroš, Jan (advisor)
Selective laser melting (SLM) is an additive manufacturing technique (AM), that allows production of complex geometries that can be found in lattice structures. Processing of magnesium-based materials with this technology is difficult because of their high reactivity. This bachelor’s thesis clarifies the effects of processing parameters (laser power and laser scan speed) on surface roughness of lattice structures. The theoretical part of this thesis deals with the issue of magnesium alloys and manufacturing of lattice structures. The practical part of this thesis contains the design of the experiment and evaluation of the given experiment. Based on the results of the experiment, the dependencies of process parameters were made on surface roughness and incline angle of struts. The main takeaway of this thesis for the reader is in familiarization with the issue of process parameters and their effect on surface roughness in lattice structures.
|
|
|
Gears created by 3D printing for consumer use
Chládek, Vilém ; Sedlák, Josef (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis deals with gears and subsequently with 3D print. 3D print is nowadays a rapidly evolving technology which can solve complex assemblies. This text contains gears analysis and their parameters. The next section describes 3D printing technologies and the materials used. The main point of the solution is elaboration of the 3D model of a hand-powered drill and its subsequent 3D print. With this is discussed, the issue of fitting, model assembly and post-processing. A successfully printed and functional drill can be then used for educational purposes or as a suitable pattern for the kit.
|
|
|
Use of 3D printing in the production of functional prototypes for automotive
Mikulášek, Marek ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This thesis deals with the 3D printing of composite materials. The constant development of this technology has enabled the application of this method for the production of prototypes, but also functional components. The theoretical part deals with the study of composite materials and the principle of production using additive technology. In the practical part, an analysis of the suitability of part processing using the 3D printing method is performed on a specific component and than applicated to the assembly hall located in ŠKODA AUTO a.s.
|
|
|
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.
|
|
|
Design of forming tool production technology using the additive method of 3D printing
Obadal, Jan ; Vašíř, Jakub (referee) ; Sedlák, Josef (advisor)
This bachelor thesis deals with a plan of a forming device manufacturing technology utilising additive methods of 3D printing. The theoretical part of this thesis deals with the characteristics of sheet metal forming technology and the characteristics of additive technology. The practical part of this thesis contains a breakdown of the current state and it deals with usage of the current forming tool. In terms of the practical part, there is an innovation draft whose goals it to speed up the manufacture of a particular pressed piece. The principle of this innovation is the utilisation of a single-purpose machine which is optained through the additive method of 3D printing. The optimal combination of printing parameters and tool geometry are found through prototype testing. To keep the product measurements accurate requires modified proportiong of the semi-finished product. The final tool is capable of bending two pressed pieces at the same time. During the process of bending, it is necessary to review the measurements of every 25th pressed piece and to revise the position of a bottom dead center. The lifetime of this innovative tool is set to 600 pieces. Technological and economical evaluation shows return of invesments and reduced time due to the application of this innovation, thanks to which the bending time is reduced by 50 %.
|
|
|
Application of CAD/CAM software PowerMILL 2020 for turning
Horáček, David ; Sliwková, Petra (referee) ; Polzer, Aleš (advisor)
The work is focused on introduction and brief description of CAM software PowerMill 2020 from a company named Autodesk. Furthermore, this thesis discusses the issue of CAD/CAM systems, especially additive manufacturing. Description, division, technology, materials and area of application of additive manufacturing including advantages and disadvantages are discussed. The work also includes the issue of hybrid manufacturing and introduces the most important companies operating in this area of production. The practical part of the thesis is mainly focused on outlining the machining process of own designed part in the PowerMILL2020.
|
guest ::
