20.500.12556/RUL-156433 Uvedba računalniške tomografije kot metrološke metode v livarski proces Introduction of computed tomography as a metrological method in the casting process Poroznost kot zračni mehurčki v procesu litja predstavlja največji izziv, saj prisotnost le-teh vpliva na mehanske lastnosti ulitka. Za odkrivanje poroznosti se uporabljajo različne metode, med katerimi nekatere pri odločitvah vključujejo človeški faktor. Zadnja in najmodernejša metoda je uporaba računalniške tomografije, ki nam prostorsko, vrednostno in celovito prikaže nepravilnosti v materialu, kar je bilo v večini primerov v preteklosti nemogoče oziroma ne dovolj definirano ali dosegljivo za neko uporabno vrednost. V magistrskem delu so v teoretičnem delu najprej predstavljene generacijsko in kvalitativno različne metode zaznavanja poroznosti. Predstavljene so teoretične osnove statističnega nadzora procesa in metode stroškov kakovosti. V nadaljevanju je v eksperimentalnem delu na reprezentativnem ulitku predstavljeno merilno okolje in načini merjenja poroznosti. Izvedene so meritve poroznosti z rentgenom, ki vključuje človeški faktor, in CT merilnim strojem. V rezultatih je nato predstavljena analiza meritev in vpliv načina merjenja na kakovost merilnih podatkov. V zaključku naloge je predstavljena tudi primerjava analize stroškov kakovosti za posamezen način merjenja poroznosti. Porosity, like air bubbles in the casting process, poses the greatest challenge as its presence affects the mechanical properties of the cast. Various methods are employed to detect porosity, some of which involve human factor in decision-making. The latest and most advanced method is the use of computer tomography, which spatially, quantitatively, and comprehensively reveals irregularities within the material itself, something that was often impossible or insufficiently defined in the past, or unattainable for practical purposes. In the master's thesis, the theoretical part first introduces generational and qualitatively different methods of detecting porosity. The theoretical foundations of statistical control of the process and methods of quality costs are presented. Subsequently, the experimental part presents the measurement environment and methods for measuring porosity on a representative casting. Porosity measurements are conducted using X-ray, which involves human factor, and a CT measuring machine. The results then present an analysis of the measurements and the influence of the measurement method on the quality of measurement data. The conclusion of the thesis also includes a comparison of the quality cost analysis for each method of measuring porosity. tlačno litje poroznost rentgen sposobnost procesa statistični nadzor procesa stroški kakovosti die casting porosity x-ray process capability statistical process control quality costs true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-05-25 07:30:20 2024-05-25 07:30:25 2024-05-27 11:00:36 0000-00-00 00:00:00 2024 0 [A. Hafnar] 0 XX, 65 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 621.74:676.017.62:519.23(043.2) 260139 196769539 33215.pdf 33215.pdf 1 36181D2AAA8D7919A8075B9F3C3E39FD 890818d9dd21c638fa1ff60e38e8b0540363ad38014e5c6d5de65203b9e5a138 e3a37b00-1a57-11ef-b03b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183893 Fakulteta za strojništvo 0 0 0