20.500.12556/RUL-150142 Analiza stabilnosti struženja Analysis of turning process stability Samovzbujene vibracije, imenovane drdranje, so ena izmed glavnih omejitev produktivnosti odrezovalnih procesov. Napovedovanje nestabilnih področij je zato zelo pomembno, vendar je zaradi številnih nelinearnosti v procesu analitično težko dosegljivo. Magistrska naloga analizira stabilnost struženja v časovni domeni z reševanjem diferencialnih enačb z zamikom. Predstavili smo teoretične osnove mehanike in dinamike odrezavanja. Izvedli smo eksperimente struženja za določitev komponent sil v odvisnosti od podajanja in globine rezanja, ki smo jih aproksimirali s polinomom. Izvedli modalno analizo orodja z držalom in določili prenosno funkcijo odziva na vzbujanje v podajalni smeri. Rezultate iz obeh delov smo uporabili v gibalni enačbi sistema drdranja, ki smo jo numerično reševali s kodo dde23 v programskem okolju Matlab. Z analizo rezultatov simulacij smo formirali stabilnostni diagram, ki upošteva nelinearno odvisnost sile od debeline odrezka in nelinearnost, ki se pojavi ob skoku orodja iz materiala. Pokazali smo, da je z reševanjem diferencialnih enačb z zamikom možno simulirati drdranje v procesu struženja in pri tem upoštevati nelinearnosti, kar pri analizi v frekvenčni domeni ni mogoče. Self-induced vibrations, known as chatter, are one of the main limitations to the productivity of cutting processes. Prediction of unstable areas is therefore very important but is analytically difficult to achieve due to the many non-linearities in the process. This thesis analyses the stability of turning in the time domain by solving delay differential equations. We presented the theoretical foundations of the mechanics and dynamics of turning. We carried out turning experiments to determine the force components as a function of feed and depth of cut and approximated them by a polynomial. We conducted modal analysis of the tool with the toolholder and determined the transfer function of the response to excitation in the feed direction. We used the results from both measurements in the equation of motion of the chatter system, which we solved numerically with the code dde23 in Matlab. By analyzing the results of the simulations, we formulated the stability diagram, considering the non-linear dependence of the force on the thickness of the chip and the non-linearity that occurs when the tool jumps out of the material. We have shown that by solving delay differential equations it is possible to simulate chatter in the turning process while accounting for the nonlinearities, which is not possible in frequency domain analysis. struženje drdranje mehanika odrezavanja dinamika odrezavanja modalna analiza diferencialne enačbe z zamikom turning chatter cutting mechanics cutting dynamics modal analysis delay differential equations true false false [M. Porenta] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2023-09-14 08:30:24 2023-09-14 08:30:27 2023-10-02 10:12:23 0000-00-00 00:00:00 2023 0 Ljubljana 0 XX, 62 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.941:531/534:517.9(043.2) 256484 166533891 29551.pdf 29551.pdf 1 46CDB49CC5022082E5F24FAAFC882909 4b2f22e5ba62c77ff35075fc11659c17b2be5c90c58282c60ba9ed0d1a4e2fff 319db35a-52c8-11ee-b233-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=174691 Fakulteta za strojništvo 0 0 0