|
| |
|
|
Design of Stationary Machine for Threadig Plastic Sheathing on Wide Bandsaw Blades
Riedl, Jan ; Vespalec, Arnošt (referee) ; Koutný, Daniel (advisor)
This thesis deals with the design of a machine for threading plastic sheathing on single-sided band saw blades with dimensions from 4500 x 80 x 1.0 mm to 12500 x 290 x 1.85 mm. The aim of the thesis is to create an assembly model, the text is focused on a detailed description of the machine. The device was designed in SOLIDWORKS software. The main goal and partial goals of the thesis were met. The thesis is developed to the level of structural design and assembly description, along with calculations of key parts in the structural solution. The method of operating the machine is outlined. The thesis can serve as a starting point for future designs of a machine for threading protective plastic sheathing on saw bands of the stated dimensions.
|
|
|
3D Construction Printing of Coarse Aggregate Cementitious Composite
Vespalec, Arnošt ; Czarnecki, Sławomir (referee) ; Lloret-Fritschi, Ena (referee) ; Koutný, Daniel (advisor)
Today, the construction industry experiencing a period of rapid development. This is resulting in a massive production of greenhouse gas emissions (39% of global CO2 production) and an overexploitation of scarce natural resources leading to inevitable climate change. In this context, cement binders production represents one of the most significant environmental challenges. Despite extensive research being conducted on alternatives to cement, there remains considerable untapped potential in conventional building materials. The situation has led to a paradigm shift in the conventional construction sector, as inventive manufacturing techniques, including automation, are implemented. This predominantly involves additive manufacturing, particularly 3D printing in the construction industry, commonly referred to as 3DCP (3D Construction/ Concrete Print). The dissertation examines the possibilities of using a mixture with coarse aggregate for 3DCP technology. This mixture has the potential to increase production efficiency and reduce the amount of other components, decreasing Portland cement usage and as a result, CO2. The thesis investigates a workability of a mixture containing 8 mm coarse aggregate and its effect on the printing parameters. Finding the optimal combination of process parameters for a mixture using simulation tools can improve its buildability, eliminate the need for a trial-and-error approach and thus rapidly reduce waste. Analysis of the results demonstrates that the mixture containing coarse aggregate exhibits less buildability than the mixture without coarse aggregate. Although the mix containing coarse aggregate exhibited a lower level of rigidity in comparison to the mix without coarse aggregate, the Young's modulus values obtained are similar to those reported in other research dealing with printable "concrete" at early mixture ages. Further investigation using Design of Experiment (DOE) techniques resulted in a combination of 3D printing process parameters (print footprint dimensions, print speed) that were validated by the simulation software Abaqus. The utilisation of these process parameters has resulted in enhanced print stability, thereby improving the buildability of the printed object, and reducing the occurrence of deformation. The mixture containing coarse aggregate effectively diminishes the requirement for additional mix material components by around 16%, resulting in decreased cement consumption and substantial CO2 emissions (equivalent to 52 kg per cubic metre of concrete). These factors, in conjunction with 3D printing technology in the construction industry, contribute to a sustainable approach to industrial production. This research contributes to a greater comprehension of the behaviour of cementitious composites with coarse aggregate sizes of up to 8 mm and their dependence on printing parameters. The findings and outcomes are summarised in three peer-reviewed scientific articles.
|
|
|
Design of electrical travel of reaper`s drive unit
Otoupalík, Jan ; Černý, Michal (referee) ; Koutný, Daniel (advisor)
This bachelor thesis focuses on the design of electrical travel for universal mowing machine, which will be controlled remotely. Designed travel has independent wheel drive, the maximum speed of 10 km per hour and can be used in the terrain with a slope of 30°. The thesis deals with the determination the parameters of the travel, design of the possible electrical drive units and design with respect to the stability of the device. Another part of the thesis deals with the design of the travel and describes particular parts of the travel.
|
|
|
Design of vacuum pressing device for plastics
Chlup, Pavel ; Drápela, Miloslav (referee) ; Koutný, Daniel (advisor)
This diploma thesis is about designing vacuum pressing device for plastics as an important method of manufacturing semi-finished plastic products. In introduction part of this thesis there is described a process of this method, the application field among the another plastics processing technologies, basic information about using semi-finished products and moulding forms. There are three versions of solution. After the estimation of this versions there is a decision about a final form vacuum pressing device. One’s own design work contains a project of a device like this with the help of Autodesk Inventor CAD system. In the end of the work, there is financial balance-sheet too.
|
|
|
Heat treatment of aluminum alloy AlSi7Mg0,6 fabricated by metal 3D printing
Zabloudil, Jan ; Malý, Martin (referee) ; Koutný, Daniel (advisor)
Author tries to obtain new information about the influence of different heat treatments on SLM fabricated AlSi7Mg0,6 alloy, its mechanical properties and residual stress. For this purpose were chosen parameters of heat treatment based on previous research of other authors. With the use of normalised tensile strength test specimens and special specimens for analysis of deformation caused by the residual stress were the influences studied. Author checked the influence of stress relieving annealing, parameters of precipitation hardening and artificial ageing on mechanical properties and residual stress in the material. Results can help fabrication of studied material to receive required properties and eliminate the deformation caused by the residual stress.
|
|
|
Design of additively manufactured oil-water heat exchanger for formula student
Březina, Josef ; Dočekalová, Kateřina (referee) ; Koutný, Daniel (advisor)
Diploma thesis deals with a design and manufacture of oil cooler by technology Selective Laser Melting for Formula Student. The main goal of the design is to ensure optimal oil circuit cooling at a minimal mass. The design of manufactured oil cooler is based on a plate heat exchanger concept with optimized intakes by CFD simulations and heat exchange body with fins of thickness 0.17 mm. An analytical model was created. SLM process parameters were optimized for a thin walls printing, Subsequently, a fabrication of testing parts was finished for measuring pressure drops and performances of micro heat exchangers. Results were used for an accuracy improvement of the analytical model and for consequent optimization of heat exchange surface. Afterwards optimization was executed for inlets and outlets by using flow simulations. A prototype was built and verified on a test stand. Performance of the designed oil cooler is 4.5 kW for race mode, where temperature drop of oil circuit is 22 °C. The lightweight design weighs 320 g, which reduces more than 47 % of a current oil-air cooler weight. Furthermore, a centre of gravity is decreased by designed placement of the cooler.
|
|
|
Entry module of processing line for ozonic deterioration of tyres
Slezák, Jan ; Veselý, Oldřich (referee) ; Koutný, Daniel (advisor)
The aim of this diploma thesis is making design of device for setting tyres into the machine for ozone deterioration of tyres with following parametres: tyre size 295/80 R22,5, deployment profile of tyres, its foundation into the machine and sealing ozone atmosphere. The first part of this thesis contain research retailing to issues of tyre. After that there si presented design, which is completely making in programme Autodesk Inventor 2010. Calcutations are making in programme Mathcad 14 and deformation load, mainly construction, is making in programme Ansys 12.1. Finally there is making drawings.
|
|
| |
|
|
Development of 3D metal printing process parameters for producing of the lattice structure
Jaroš, Jan ; Koutný, Daniel (referee) ; Vrána, Radek (advisor)
Selective laser melting (SLM) in additive technology, which allows production of lattice structures. Lattice structures are very difficult to produce using conventional methods. The main use of lattice structures is in aerospace industry and medicine for bone implants production. In this work influence of processing parameters (laser power, scanning speed) on properties (diameter, surface roughness, porosity) of struts is investigated. The processing parameters selection was based on single tracks test. In the first test, ImageJ was used to determine porosity of struts. In the second test porosity was analyzed with more accurate µCT technology. Both tests used 3D scanning technology to determine dimension accuracy and surface roughness of samples. The measurement results led to the detection of processing parameter „window“ where samles had the best combination of surface roughness and porosity. The best results were achieved with 225-275 W laser power and scanning speed of 1400-2000 mm·s-1.
|
guest ::
