3541 KB32 KB199920252014Govekar, EdvardKopač, JanezPotočnik, PrimožThaler, Tilenštevilka:4letnik:60str. 265-273, SI 49ISSN:0039-2480COBISSID:13402395URN:URN:NBN:SI:doc-KUGKSZC2enZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikdrdranjeempirična karakterizacijahisterezahysteresisnestabilnost procesovspektralne analizetračno žaganjeExperimental chatter characterization in metal band sawing|One of the most detrimental instability phenomena in metal band sawing is chatter, i.e. high amplitude vibrations of the tool and/or workpiece. In this paper, the influence of the cutting speed and of the distance between the blade supports on chatter phenomena is investigated. For this purpose a series of experiments with triangular cutting speed variation at several pre-selected distances between the blade supports was conducted on structural steel (St37, DIN 17100) workpieces. A feature for chatter detection was extracted from the power spectra of the machine vibration signal, and a set of characteristics was introduced for experimental chatter characterization. The results showed the presence of a chatter hysteresis which depended on the cutting speed. Additionally, apart from the blade support distance, the cutting speed was shown to be a strongly influencing parameter, and as such also promising for chatter control in band sawing processesPri visoko hitrostnem odrezovanju kovin s tračno žago se med procesom odrezovanja zaradi nestabilnosti procesa pogosto pojavijo visoko-amplitudna nihanja orodja in/ali obdelovanca. Nastala visoko amplitudna nihanja imenujemo drdranje. Drdranje izrazito škodljivo vpliva na kakovost površine obdelovancev, obrabo orodja in posredno na storilnost procesa. Eden glavnih ciljev razvoja modernih tračnih žag je izdelava inteligentne tračne žage, ki bi bila zmožna samodejno prilagoditi procesne parametre pri pogoju maksimalne storilnosti odrezovalnega procesa. Procesna parametra, ki najbolj vplivata na pojav drdranja, sta rezalna hitrost in razdalja med podporama orodja, zato smo z raziskovalnim delom, ki ga objavljamo v tem članku, okarakterizirali pojav drdranja v odvisnosti od omenjenih dveh parametrov. Karakterizacija drdranja v odvisnosti od parametrov procesa je ključnega pomena pri razvoju algoritma za samodejno prilagajanje procesnih parametrov pri maksimalni storilnosti procesaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo