2886 KB25 KB199920252017Han, ZhirenJia, ZhenLiu, BaomingXiao, Yongštevilka:2letnik:63str. 111-118ISSN:0039-2480COBISSID_HOST:15300635URN:URN:NBN:SI:doc-ZAX2FXXIenZveza strojnih inženirjev in tehnikov Slovenije etc.Strojniški vestnikfinite element methodmetoda končnih elementovnapetostiosno nesimetrično rotacijsko preoblikovanjerotacijsko preoblikovanje brez trnastanje preoblikovalnega utrjanjaWork hardening of non-axisymmetric die-less spinning|Non-axisymmetric shell parts are widely used in the fields of aviation, aerospace and automobiles. Because of good flexibility, short production preparation period and low cost, die-less spinning has the advantages in processing those parts. However, the special work-hardening distribution being caused by its processing technology will affect the performance of these parts. Therefore, the work-hardening of non- axisymmetric die-less spinning is studied through experiments and by using the finite element method (FEM). The law of smaller half cone angle (HCA) with bigger work-hardening is found by testing the surface hardness of the spun workpieces. Microstructure observation and theoretical analyses are adopted to reveal the law. The reason for that is that the roller causes greater plastic strain inhomogeneity in the smaller HCA-forming process. It is also found that the working condition with the largest HCA difference has the biggest work-hardening difference and the maximum hardness difference can be 15 %Osno nesimetrične lupine se pogosto uporabljajo v letalski, vesoljski in avtomobilski industriji. Rotacijsko preoblikovanje brez trna je primerno za izdelavo tovrstnih delov zaradi dobre fleksibilnosti, kratke priprave proizvodnje in nizkih stroškov. Polje sil med procesom pa je drugačno kot pri preoblikovanju s trnom, saj surovec ni podprt. Posebna osno nesimetrična oblika povzroči značilno porazdelitev utrjanja pri rotacijskem preoblikovanju brez trna, s tem pa vpliva na lastnosti stožčastih delov. V eksperimentih rotacijskega preoblikovanja so bili uporabljeni trije različni nabori delovnih pogojev za različna polovična kota stožca HCA (45-30°, 60-30° in 60-45°)TEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo