20.500.12556/RUL-183091 Načrtovanje livarske tehnologije za izdelavo ohišja dušilne lopute za vbrizgavanje goriva diplomsko delo Design of casting technology for production of fuel injection throttle body diploma work Gravitacijsko litje v peščene forme je ena izmed najstarejših metod litja, ki je še danes v uporabi. Pri tem postopku se tekoča zlitina ulije v peščeni kalup, kjer se livna votlina gravitacijsko napolni. Na kakovost ulitka vplivajo številni dejavniki, med katerimi so pravilna zasnova ulivnega in napajalnega sistema, livne lastnosti taline, kakovost forme ter pogoji strjevanja. Namen diplomskega dela je bil načrtovanje livarske tehnologije gravitacijskega litja v peščene forme za izdelavo ulitka ohišja dušilne lopute za vbrizgavanje goriva iz aluminijeve zlitine AlSi9Cu3. S programskim paketom ProCAST smo naredili izračun livarskih procesov različnih livarskih tehnologij. Na podlagi dobljenih rezultatov smo pripravili forme iz peščene mešanice, nato pa smo iz njih pripravili ulitke z izboljšanim napajanjem. Poroznost vzorcev smo analizirali z rentgensko računalniško tomografijo ter jih prežagali za vizualni pregled poroznosti. Primerjava rezultatov izračuna livarskih procesov in realnih vzorcev je pokazala dobro ujemanje, kar je potrdilo zanesljivost izračuna livarskih procesov za načrtovanje livarske tehnologije. Primerjalni vzorec, pripravljen brez optimizirane tehnologije napajanja, je vseboval veliko poroznosti, predvsem na debelješih delih ulitka. Z dodano hladilno kokilo na spodnjem delu ulitka in izoliranim napajalnim sistemom na zgornjem delu smo dosegli usmerjeno strjevanje, kar je bistveno zmanjšalo poroznost končnega ulitka. Iz dobljenih rezultatov smo ugotovili, da je bila poroznost na končnem ulitku še delno prisotna na zgornji polovici, kar kaže, da napajalnik ni bil dovolj masiven za popolno napajanje celotnega ulitka. Gravity casting in sand molds is one of the oldest casting methods, which is still widely used in industry today. In this process, molten alloy is poured into a sand mould, where the mould cavity is filled by gravity. The quality of the casting is influenced by numerous factors, including the proper design of the gating and feeding system, the casting properties of the melt, the quality of the mould and the solidification conditions. The aim of the diploma thesis was to design the casting technology of gravity sand casting for the production of a fuel injection throttle body housing from aluminium alloy AlSi9Cu3. Numerical simulations of various casting technologies were carried out using the ProCAST software package. Based on the obtained results, moulds were prepared from a sand mixture in the laboratory. Castings were then produced with improved feeding. The porosity of the samples was analysed by computer tomography and the samples were also cross-sectioned for visual inspection of porosity. A comparison of the numerical simulation results and the real samples showed good agreement, which confirmed the reliability of the numerical simulation tool for the design of casting technology. The reference sample, prepared without optimised technology, contained significant porosity, particularly in the bosses of the casting. By adding a chill on the lower part of the casting and an insulated feeder on the upper part, directional solidification was achieved, which significantly reduced the porosity of the final casting. From the obtained results it was determined that porosity was still partially present in the upper half of the final casting, indicating that the feeder was not sufficiently massive to fully feed the entire casting. gravitacijsko litje peščena forma usmerjeno strjevanje izračun livarskih procesov krčilna poroznost gravity casting sand mould directional solidification numerical simulation shrinkage porosity true false false N. Trobec Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-06-04 08:43:20 2026-06-04 08:43:28 2026-06-08 10:04:48 0000-00-00 00:00:00 2026 0 Ljubljana 0 Ljubljana X, 30 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 113897 280761603 29376.pdf 29376.pdf 1 93D0CE18D047D5C7C6B589588E12CA7A 904618a5d2c02a4dc24428e7bf778224bb3857f6e5224c3f11fb0e8ab42edd43 535038fc-5fe0-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=234935 Naravoslovnotehniška fakulteta 0 0 0