20.500.12556/DKUM-59182 Vpliv plamenskega ravnanja na nosilnost teleskopskih ročic Influence of flame straightening on load capacity of telescopic booms Teleskopske ročice so zvarjenci, izdelani iz modernih nizkolegiranih visokotrdnostnih finozrnatih jekel. Kot vsi zvarjenci so podvrženi deformacijam zaradi varjenja. Deformacije je treba zmanjšati in med najpomembnejše tehnično in ekonomsko sprejemljive postopke za ravnanje štejemo plamensko ravnanje. Pri plamenskem ravnanju s pomočjo mehanskih vpetij in lokalnega vnašanja toplote s plamenom povzročamo lokalno plastično deformacijo materiala in s tem spreminjamo obliko in velikost obdelovanca. Ker je material S700MC, iz katerega so izdelane teleskopske ročice, občutljiv na vnose toplote, je bil v nalogi raziskan vpliv plamenskega ravnanja na nosilnost tega elementa. Zbrani so bili podatki iz literature in izvedeni preskusi udarne žilavosti in natezne trdnosti. Z metodo končnih elementov so bile ponazorjene deformacije in obnašanje materiala v vroči točki in okolici. Naloga pokaže, da lahko plamensko ravnanje uspešno izvajamo brez vpliva na nosilnost, treba pa je uporabljati nižje temperature, kot smo jih vajeni iz ravnanja konstrukcijskih jekel nižje natezne trdnosti. Naloga tudi pokaže, da je potrebno pripraviti in slediti prilagojenim navodilom za izvedbo plamenskega ravnanja za različne vrste jekla. Boom arms are welded out of modern high-strength low-alloy fine grained steel. Like all welded structures, they are also subjected to welding deformation which has to be reduced. Flame straightening is one of the technically and economically most acceptable procedures for reducing welding deformations. With this process, local plastic deformations are caused by means of mechanical fixtures and local heat input, thus changing the material in shape and size. As the material S700MC, which the boom arms are made out of, is sensitive to heat input, flame straightening influence on the load capacity of boom arms was researched. Available information was gathered and the Charpy impact test was conducted along with tensile testing. The finite elements method was used to illustrate the behavior of the material at hot spot and in the surrounding area. The study has shown that flame straightening can successfully be performed with no impact on the load capacity of the element, however at lower temperatures as usually used for construction steels of lower tensile strength. The study has also shown that customized procedures for different steel types have to be prepared and followed. ANSYS deformacije pri plamenskem ravnanju finozrnata jekla – HSLA optimizacija in izboljšave v procesu plamenskega ravnanja plamensko ravnanje S700MC temperatura Ac1 za S700MC termomehansko valjana jekla vroče točke pri plamenskem ravnanju ANSYS flame straightening deformation fine grained steel – HSLA flame straightening high-strength low-alloy steel hot spots in flame straightening optimization and improvement of flame straightening process S700MC temperature Ac1 for S700MC thermomechanically rolled steels true true false [D. Slana] Slovenski jezik Angleški jezik Magistrsko delo 2016-05-08 10:31:14 2016-06-08 12:38:40 2022-06-20 03:05:44 2019-07-11 11:05:26 2016 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.178.6:621.791.053(043.2) 19742230 URN:SI:UM:DK:I9XVZ74G MAG_Slana_Danilo_2016.pdf MAG_Slana_Danilo_2016.pdf 1 37A1BCE8212303ABF0F300056549AEEB e926e441edc17b85e00850a86aa43c4a32ff67a6f262d029bd486b0e83292ecc 9b25eb2e-7c0c-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=93275 Fakulteta za strojništvo 0 0 0