20.500.12556/RUL-120539 Preiskava bentonitne peščene mešanice za izdelavo enkratnih livarskih form Research of a bentonite sand mixture for the manufacture of disposable casting moulds Diplomska naloga zajema preiskavo bentonitnih peščenih mešanic, ki se uporabljajo za izdelavo enkratnih form na avtomatskih formarskih linijah. Preiskava obsega različne peščene mešanice, ki se sestojijo iz osnovnega ognje-obstojnega materiala - kremena, ter bentonita in dodatkov za tvorbo svetlečega ogljika. Delo bo izvedeno na dveh osnovnih ognjevzdržnih materialih - kremenovih peskih, ki sta po poreklu iz domačega peskokopa Termit in nemškega Quartz Werke Strobel. V eksperimentalnem delu bomo v livarskem laboratoriju eksperimentalno opredeljevali naslednje lastnosti: količino vode, tlačno trdnost, razkolno trdnost, strižno trdnost, propustnost, stisljivost, nasipno gostoto, natezno trdnost kondenzacijske cone, delež odpranih snovi in delež aktivne gline. Nadalje je bila izvedena tudi sejalno analizo, pri kateri je bila opredeljena srednja velikost zrn, stopnja enakomernosti, količina in velikost podzrn in nadzrn. Izvedeno je tudi merjenje dejanske specifične površine, izračunana je tudi teoretična. Na osnovi obeh rezultatov je izračunan koeficient oglatosti, ki je primerjan z mikroskopskimi posnetki preiskovanih peskov. Delo obsega tako analizo industrijske peščene mešanice, kot tudi sintezo lastne laboratorijske. The diploma thesis covers the investigation of bentonite sand mixtures used for the production of disposable molds on automatic molding lines. The investigation includes various sand mixtures consisting of a base fire-resistant material-quartz, as well as bentonite and additives for the formation of luminous carbon. The work will be carried out on two basic refractory materials - quartz sands, which originate from the domestic sand pit Termit and the German Quartz Werke Strobel. In the experimental part, the foundry laboratory will experimentally define the following properties: water quantity, compressive strength, crack strength, shear strength, permeability, compressibility, bulk density, tensile strength of the condensation zone, proportion of sludge, proportion of active clay. Furthermore, we will also perform a sowing analysis, which will define the average grain size, the degree of uniformity, the quantity and size of subgrains and supergrains. A measurement of the actual specific area will also be performed. Theoretical will also be calculated. Based on the bobe results, an angularity coefficient will be calculated that will be compared with microscopic images of the sands examined. The work includes both the analysis of the industrial sand mixture as well as the synthesis of our own laboratory. analiza industrijske bentonitne mešanice analiza in primerjava sintetizirane laboratorijske bentonitne peščene mešanice sejalna analiza in obraba kremenovega peska sprememba specifične površine kremenčevega peska analysis of industrial bentonite sand mixture analysis and comparison of synthesized laboratory bentonite sand mixture sieving analysis and wear of quartz sand change of specific surface of quartz sand true false false Slovenski jezik Angleški jezik Višješolska diplomska naloga 2020-09-22 09:00:03 2020-09-22 09:00:18 2022-09-01 03:59:26 0000-00-00 00:00:00 2020 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 75757 33745155 5845.pdf 5845.pdf 1 F45AFC733048FC369A6C44D56B86B37E 8e6b83d181d8e2fb955c70eb05ffe41bfacb564f05ffc78dedfe720c99020d02 1d302bcb-a1ba-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=135346 Naravoslovnotehniška fakulteta 0 0 0