2243 KB30 KB199920252014Dargusch, Matthew S.Liu, ChangyiWang, Guištevilka:11letnik:60str. 716-724, SI 136ISSN:0039-2480COBISSID:13772315URN:URN:NBN:SI:doc-LZF7MYZ8enZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikdinamika rezanjadrdranjemodeliranjenačrtovanje procesaodrezavanjerezalne silerezkanje po vijačniciMechanics and dynamics of helical milling operations|This paper presents analytical models dealing with time domain cutting forces and the time and frequency domain dynamics of helical milling operations. The cutting forces both on the side-cutting edges and on the end-cutting edges along the helical feed path are modelled by considering the tangential and the axial motions of the tool. The dual periodicity, which is caused by the spindle rotation, as well as the period of the helical feed of the cutting tool has been included. The models of the machining process dynamics and of the chatter stability problems are decomposed into two parts: the critical axial depth of cut, and the critical radial depth of cut, both of which are solved. The dynamics model allows the selection of processing parameters, including axial cutting depth, radial cutting depth, and spindle rotation velocity in the chatter-free zone and the prediction of chatter vibrations during helical milling. Experiments have also been performed for real machining observations in order to verify the chatter-free zone obtained from the analytical modelPostopki rezkanja po vijačnici se uporabljajo za ustvarjanje ali širjenje izvrtin s pomočjo rezkalnega orodja, ki se podaja proti obdelovancu po poti v obliki vijačnice. Pomembni dejavniki pri izbiri obdelovalnih postopkov so predvsem natančnost, učinkovitost in stroški. Preučevanje stabilnosti obdelave in drdranja je pomembno za načrtovanje procesa. V zadnjem času je bilo objavljenih nekaj analiz rezalnih sil pri procesu rezkanja po vijačnici. Čeprav so bili raziskani mehanizmi in dinamika posebnih operacij z aksialnim podajanjem, kot sta npr. potopno rezkanje in vrtanje, oz. s tangencialnim podajanjem, kot je npr. krožno rezkanje, pa še ni bil opredeljen model dinamike in drdranja pri rezkanju po vijačnici. Cilj tega članka je torej preučitev mehanike in dinamike procesov rezkanja po vijačniciTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo