20.500.12556/RUL-181868 Določitev K-faktorja pri upogibanju pločevin za klimatske naprave diplomsko delo delo Determination of the K-factor in sheet metal bending for air handling units diploma work Upogibanje je ena najpogostejših operacij preoblikovanja pločevine v proizvodni industriji. V diplomski nalogi je natančneje obravnavana proizvodna industrija klimatskih naprav. Gre za plastično deformiranje pločevine okoli osi, pri čemer se spremeni njena oblika. V pločevini med upogibanjem nastaneta dve vrsti napetosti: na konveksni strani se pojavijo natezne napetosti, na konkavni pa tlačne. Med območjema nateznih in tlačnih napetosti se nahaja nevtralna ravnina, kjer se deformacije ne pojavljajo. Položaj nevtralne ravnine ni na sredini debeline pločevine, ampak je odvisen od materiala, debeline, radija ter kota upogiba, načina upogibanja in drugih procesnih dejavnikov. Ta položaj opisuje K-faktor, ki je ključen pri preračunu razvitega stanja pločevine, saj omogoča pravilno določitev dolžin in natančno izdelavo konstrukcijskih delov klimatskih naprav. V eksperimentalnem delu je bil K-faktor določen na podlagi meritev, nato pa smo s pomočjo numeričnih simulacij preverili, ali je z njimi mogoče K-faktor natančno napovedati. Za določitev mehanskih lastnosti pločevin je bil izveden natezni preizkus. K-faktor je bil izračunan iz dimenzij ter podatkov, izmerjenih na upogibnih vzorcih v podjetju ter nato preverjen v programski opremi za inženirske simulacije ANSYS. Izdelana je tabela K-faktorjev, ki bo služila kot pomoč konstruktorjem in tehnologom pri pravilnem določanju razvite dolžine pločevine za posamezne materiale in pogoje krivljenja. Bending is a common sheet metal forming operations in the manufacturing industry, specifically in the HVAC manufacturing sector addressed in this thesis. Bending is a process of plastic deformation of sheet metal around an axis, resulting in a change of its shape. During bending, the sheet metal undergoes two types of deformation: tensile deformation occurs on the convex side, while compressive deformation appears on the concave side. Between the tensile and compressive stress regions lies the neutral plane, where no deformation occurs. The position of the neutral plane is not located at the middle of the sheet thickness, but it depends on the material, sheet thickness, bending radius, bending angle, bending method, and other process parameters. This position is described by the K-factor, which is essential for calculating the developed (flat) length of the sheet metal, as it enables accurate determination of dimensions and precise manufacturing of HVAC structural components. In the experimental part, the K-factor was determined based on measurements, after which numerical simulations were used to verify whether the K-factor could also be accurately predicted through simulation. A tensile test was performed to determine the mechanical properties of the sheet metal. The K-factor was calculated from the dimensions and data measured on bent samples in the company and subsequently verified using the engineering simulation software ANSYS. A table of K-factors was developed to serve as a reference tool for design engineers and technologists in accurately determining the developed (flat) length of sheet metal for specific materials and bending conditions. Upogibanje razvita dolžina pločevine K-faktor eksperiment numerične simulacije Bending developed sheet metal length K-factor experiment numerical simulations true false false T. Alič Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-04-17 09:00:06 2026-04-17 09:00:19 2026-04-21 10:57:16 0000-00-00 00:00:00 2026 0 Ljubljana 0 Ljubljana XI, 38 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 113542 275938051 29047.pdf 29047.pdf 1 B0305362811E6D0991E052553FE95FAF 67e0f1ee9810df2f232263ac7674d0fdc7ec462c7d65affb2c962a7cd24c18f1 ddcd59a0-3a2a-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=232620 Naravoslovnotehniška fakulteta 0 0 0