20.500.12556/RUL-130239 Vpliv debeline brade na končne lastnosti kovanih ojnic iz jekel 36MnVS4 in 46MnVS5 diplomsko delo Influence of flash thickness on the final properties of forged connecting rods made of 36MnVS4 and 46MnVS5 steels diploma work V podjetju Unior izdelujejo zahtevne odkovke podvozij in kovanih krmilnih delov. Med njihove glavne izdelke se uvrščajo ojnice za bencinske in dizelske motorje osebnih vozil. Izdelujejo jih po postopku utopnega kovanja, ki spada med najpomembnejše postopke preoblikovanja. V diplomski nalogi smo analizirali ojnice, narejene iz jekel 36MnVS4 in 46MnVS5 treh različnih dobaviteljev. Določili smo mehanske lastnosti materiala, mikrostrukture, tok materiala in debeline brade po kovanju na novem in izrabljenem orodju. Vzorci so bili odvzeti tako na glavah kot tudi steblih ojnic. Vse vrednosti izmerjenih mehanskih lastnosti so bile v okviru predpisanih vrednosti. Z numerično simulacijo smo določili, da je tok materiala med kovanjem na izrabljenem orodju bolj laminaren kot na novem orodju. Z naraščajočim številom izkovkov se veča obraba orodja, s tem pa se spreminja dimenzija brade izkovka. Ugotovili smo, da v praksi obraba orodja bistveno ne vpliva na nastanek razpok na izkovkih. Unior manufactures sophisticated forgings of chassis and forged steering parts. Their main products are connecting rods for petrol and diesel engines of cars. Products are made by the forging process, which is one of the most important transformation processes. In diploma work, we analyzed connecting rods made of 36MnVS4 and 46MnVS5 steel from three different suppliers. We determined the mechanical properties of the material, microstructure, material flow and flash thickness after forging on new and used tools. Samples were taken on both the heads and stems of the connecting rods. All values of the measured mechanical properties were within the prescribed values. Numerical simulation determined that the material flow during forging on a used tool is more laminar than on a new tool. As the number of forgings increases, the tool wear increases and the dimension of the flash thickness changes. We found that in practice tool wear does not significantly affect the formation of the span on the forgings. utopno kovanje ojnice tok materiala brada forging connecting rods material flow flash thickness true false false [M. Flor] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2021-09-11 09:00:32 2021-09-11 09:00:34 2022-09-09 04:15:29 0000-00-00 00:00:00 2021 0 Ljubljana 0 Ljubljana XII, 44 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 81466 83627011 8932.pdf 8932.pdf 1 BE48ECED8016C7731A03513BF059F676 a7a6a8029b8ef8731aad29056c5c1c9f6c6066df8e58bef3ba08fd55b24292da b5bd0225-12cd-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=147307 Naravoslovnotehniška fakulteta 0 0 0