20.500.12556/RUL-180938 Globoko vrtanje lukenj 35D v zlitino Ti6Al4V z uporabo CO₂ asistenčnega odrezavanja magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo Deep drilling of 35D holes in Ti6Al4V alloy using CO₂ assisted cutting V magistrskem delu je preučena izvedljivost globokega vrtanja lukenj razmerja 35D v titanovi zlitini Ti6Al4V z uporabo kriogenega hlajenja, pri katerem se dovaja mešanica tekočega CO₂ in minimalne količine olja (MQL). Raziskava je bila izvedena v treh fazah: test izvedljivosti, optimizacija parametrov ter test obstojnosti orodja. Uporabljeni so bili topovski svedri premera 3 mm, CNC vertikalni obdelovalni center, merilni sistem Kistler in naprava ArcLub One za kriogeno hlajenje. Rezultati so pokazali, da uporaba tekočega CO₂ v kombinaciji z MQL omogoča stabilno odvajanje ostružkov, zmanjša rezalne sile in bistveno upočasni obrabo orodja. Doseženo je bilo več kot 300–370 % podaljšanje življenjske dobe v primerjavi s klasičnimi postopki. Kakovost izvrtin je bila v tolerančnem razredu IT7–IT8, površinska hrapavost pa v razredu N7. Ekonomična analiza je pokazala, da se investicija v kriogenski sistem povrne po približno 9000 izdelanih luknjah. Rezultati potrjujejo tehnično in ekonomsko upravičenost uporabe CO₂ asistenčnega odrezavanja v industrijskem okolju. This master’s thesis investigates the feasibility of drilling 35D deep holes in Ti6Al4V titanium alloy using cryogenic cooling based on a mixture of liquid CO₂ and minimal quantity lubrication (MQL). The study was carried out in three phases: feasibility testing, parameter optimization, and a tool durability test. Experiments were conducted using 3 mm gundrills, a vertical CNC machining center, a Kistler force measurement system, and the ArcLub One cryogenic delivery unit. Results demonstrate that liquid CO₂ combined with MQL ensures stable chip evacuation, reduces cutting forces, and significantly decreases tool wear. More than a 300–370 % increase in tool life was achieved compared to conventional machining. The produced holes met IT7–IT8 dimensional tolerances, while surface roughness values were within the N7 quality range. Economic evaluation showed that the investment into a CO₂-based cooling system pays off after approximately 9000 drilled holes. The findings confirm both the technical feasibility and economic viability of CO₂‑assisted cutting for deep drilling titanium alloys. magistrske naloge globoko vrtanje lukenj obdelava titana vertikalni obdelovalni center CNC programiranje kriogeno hlajenje obstojnost orodja master thesis deep holes drilling titanium machining vertical machining center CNC programming cryogenic cooling tool life true false false [R. Žagar] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-03-20 08:30:26 2026-03-20 08:30:34 2026-03-23 14:02:58 0000-00-00 00:00:00 2026 0 Ljubljana 2026 Ljubljana XX, 68, [4] str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.95:669.295(043.2) 283334 272617475 46649.pdf 46649.pdf 1 607BA55A6D985FD6A324BDC876FC11E3 e8cee295c1b307e2272fb5c9bd04edf35534411afb1a14b3dab688169c20ef97 9970caed-242e-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=230943 46651.pdf 46651.pdf 1 00B287EC7E3C9D8B2A8DA56ABD5C4363 2c62567b754f4caa219a17c1d5201d2ef18fc1852635f08fe7cde786a473461c 99716768-242e-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=230944 Fakulteta za strojništvo 0 0 0