Uvedba računalniške tomografije kot metrološke metode v livarski proces

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Ana Hafnar (Author), Davorin Kramar (Mentor)

Abstract

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.

Keywords

magistrske naloge;tlačno litje;poroznost;rentgen;sposobnost procesa;statistični nadzor procesa;stroški kakovosti;

Data

Language:	Slovenian
Year of publishing:	2024
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[A. Hafnar]
UDC:	621.74:676.017.62:519.23(043.2)
COBISS:	196769539
Views:	32
Downloads:	9
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Introduction of computed tomography as a metrological method in the casting process
Secondary abstract:	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.
Secondary keywords:	master thesis;die casting;porosity;x-ray;process capability;statistical process control;quality costs;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XX, 65 str.
ID:	23799423