2457 KB25 KB199920252014Çolak, Oguzštevilka:10letnik:60str. 675-681, SI 123ISSN:0039-2480COBISSID:13739803URN:URN:NBN:SI:doc-CERIFNYNenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikhibridni modeliobdelavaoptimizacijavisokotlačno hlajenjezlitina Ti6Al4Vživljenjska doba orodijOptimization of machining performance in high-pressure assisted turning of Ti6Al4V alloy|In this study, a genetic algorithm has been employed to determine optimum cutting parameters in the turning of Ti6Al4V alloy under conventional and high pressure cooling conditions. Three machining performance measures, i.e. surface roughness, material removal rate and cutting power, are considered as optimization criteria. First, with multi-regression analysis of experimental responses, empirical equations are defined and, by using these equations, objective functions are constructed for each pressure level, based on a hybrid model. Objective functions are maximized by means of a genetic algorithm and optimum machining parameters are determined. Moreover, tool wear tests are carried out at a cutting condition that is close to the optimum machining parameters. Optimization results show that optimum cutting parameters and their responses, particularly in P = 6 and 150 bar cooling conditions, are quite similar, but tool life is significantly different. Maximum tool life is achieved in the highest pressure level (P = 300 bar)Zlitina Ti6Al4V je razširjena predvsem v letalski in vesoljski industriji ter pri izdelavi medicinskih izdelkov, zaradi svojih lastnosti pa spada med materiale, ki jih je najtežje obdelovati z odrezavanjem. Obdelava te zlitine brez pomožnega hlajenja je zelo težavna zaradi visokih temperatur v območju rezanja, ki so delno posledica slabe toplotne prevodnosti materiala in povzročajo hitro obrabo orodja. Iskanje rešitev za odpravo tega problema in izboljšanje obdelovalnosti zlitine Ti6Al4V gre v smeri razvoja različnih tehnik hlajenja in mazanja. En glavnih pristopov je hlajenje s pomočjo visokotlačnega curka. Osnovni princip je izkoriščanje mehanskega in toplotnega učinka hladilne tekočine pod visokim tlakom, ki se brizga na stik orodja in odrezka za boljše mazanje in hlajenjeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo