20.500.12556/RUL-170089 Analitična in eksperimentalna obravnavasamovzbujevalnih nihanj orodja in obdelovanca v primeru vzdolžnega struženja Analytical and experimental analysis of regenerative chatter in case of orthogonal turning Pri procesu struženja hitrost odrezavanja materiala omejuje tudi pojav samovzbujevalnih vibracij. Ta je nezaželen saj vodi do neustreznih obdelav površin, hitrejše obrabeali celo do loma orodja. Modeli napovedi pojava samovzbujevalnih vibracij, kot je na primer diagram globine reza v odvisnosti od vrtljajev vretena, se v praksi zaradi nezanesljivosti uporabljajo redko. Cilj te naloge je izpeljati, validirati in uporabiti dinamski analitični model sklopa orodja in obdelovanca z namenom zanesljive napovedi odziva med odrezavanjem in s tem pojava samovzbujevalnih vibracij v odvisnosti od parametrov struženja (pomika orodja in geometrije rezilnega roba). Predlagani model kot vhodni podatek zahteva še frekvenčne prenosne funkcije orodja in obdelovanca na izbranem stroju ter koeficiente odrezovalnih sil na površino odrezka, ki so v tem delu karakterizirani za primer struženja navadnega jekla, nerjavečega jekla in aluminija. Izhod iz modela je graf limitne globine reza (globine reza, pri katerem se samovzbujevalne vibracije še ne bodo pojavile) v domeni vrtljajev vretena. Predlagani model je validiran na podlagi eksperimentalnih primerov. Among other factors, the material removal rate in turning is limited by the occurrence of regenerative chatter. This phenomenon is undesirable, as it leads to poor surface quality, accelerated tool wear, or even tool breakage. Prediction models for regenerative chatter, such as stability lobe diagrams, are rarely used in practice due to their lack of accuracy. The goal of this thesis is to derive, validate, and apply a dynamic analytical model of the tool–workpiece system that can reliably predict the dynamic response during turning and, consequently, the occurrence of regenerative chatter, on the basis of turning parameters (feed rate and cutting edge geometry). The inputs to the proposed model include frequency response functions of both the tool and the workpiece on the selected machine, as well as cutting force coefficients per chip cross-sectional area, characterized in this work for aluminium, steel, and stainless steel. The model output is a stability lobe diagram showing the limiting depth of cut (the maximum depth of cut at which chatter does not occur) as a function of spindle speed. The proposed model is validated through experimental testing. struženje samovzbujevalne vibracije dinamika modalna analiza frekvenčne prenosne funkcije turning regenerative chatter dynamics modal analisys frequency response function true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-07-02 12:58:18 2025-07-02 12:58:19 2025-09-08 11:00:40 0000-00-00 00:00:00 2025 0 0 XXIV, 70 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.941:534:519.61(043.2) 271145 248020995 39147.pdf 39147.pdf 1 F9ECC045219F45AB60EAC41B12C18E79 7a79e476a6aeeb84f8c3fa031f9d800f8d9da344ebf5a6ddcacd04eae0ea8b0d 934330d2-5731-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212013 Fakulteta za strojništvo 0 0 0