ultralight aircraft; Reverzní inženýrství; Reverse engineering; digitalizace; digitizing; ultralehká letadla
Abstract
This work describes digitalization and creation of ultralight aircraft 3D model in order to create accurate moulds for fuselage lamination. Right choice of technology is based on background research. Designed procedures are described in detail as well as used equipment, hardware and software. Objective of this project is application of available methods of digitalization to create 3D aircraft model and its usage for accurate mould design.
VÉLE, F. Digitalizace trupu ultralehkého letounu pro technologii výroby přesných forem [online]. Brno: Vysoké učení technické v Brně. Fakulta strojního inženýrství. 2009.
Práce se zabývá digitalizací trupu a tvorbou 3D modelu ultralehkého letounu s ohledem na budoucí využití dat pro konstrukci přesných forem trupu pro ruční vakuové laminování. Na základě rešerše je stanoven vhodný prostředek realizace a stanoveny postupy vedoucí k digitalizaci, včetně popisu zařízení a software použitých pro proces digitalizace. Cílem práce je aplikace dostupných metod digitalizace při tvorbě 3D modelu letounu a návrh výroby přesných forem. This work describes digitalization and creation of ultralight aircraft 3D model in order to create accurate moulds for fuselage lamination. Right choice of technology is based on background research. Designed procedures are described in detail as well as used equipment, hardware and software. Objective of this project is application of available methods of digitalization to create 3D aircraft model and its usage for accurate mould design. A
SELECTIVE laser melting, TOOL-steel, POROSITY, HARDNESS, LASER beams, and ENERGY density
Abstract
The correct setting of laser beam parameters and scanning strategy for Selective Laser Melting (SLM) technology is a demanding process. Usually, numerous experimental procedures must be taken before the final strategy can be applied. The presented work deals with SLM technology and the impact of its technological parameters on the porosity and hardness of AISI H13 tool steel. In this study, we attempted to map the dependency of porosity and hardness of the tested tool steel on a broad spectrum of scanning speed—laser power combinations. Cubic samples were fabricated under parameters defined by full factorial DOE, and metallurgic specimens were prepared for measurement of the two studied quantities. The gathered data were finally analyzed, and phenomenological models were proposed. Analysis of the data revealed a minimal energy density of 100.3 J/mm 3 was needed to obtain a dense structure with a satisfactory hardness level. Apart from this, the model may be used for approximation of non-tested combinations of input parameters. [ABSTRACT FROM AUTHOR]
POLYPROPYLENE manufacturing, NOTCHED bar testing, POLYPROPYLENE, CRYSTALLIZATION, and TENSILE tests
Abstract
Multi jet fusion (MJF) technology has proven its significance in recent years as this technology has continually increased its market share. Recently, polypropylene (PP) was introduced by Hewlett-Packard for the given technology. To our knowledge, little is known about the mechanical properties of polypropylene processed by MJF technology. During this study, standardised specimens were printed under all of the major orientations of the machine's build space. Each of these orientations were represented by five samples. The specimens then underwent tensile, bending and Charpy impact tests to analyse their mechanical properties. The structural analysis was conducted to determine whether PP powder may be reused within the MJF process. The mechanical tests showed that the orientation of the samples significantly influences their mechanical response and must be carefully chosen to obtain the optimal mechanical properties of PP samples. We further showed that PP powder may be reused as the MJF process does not significantly alter its thermal and structural properties. [ABSTRACT FROM AUTHOR]
