49 KB1023 KB43 KB200020262013Budak, IgorDžunić, DraganEric, MilanMiljanić, DragomirPantić, MarkoRandjelović, SašaVukelić, Djordještevilka:1letnik:47str. 43-51ISSN:1580-2949COBISSID:959402URN:URN:NBN:SI:doc-FI1WMNQJenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeglajenjepovršinavaljanjeA burnishing process based on the optimal depth of workpiece penetration| Postopek gladilnega valjanja na osnovi optimalne globine prodiranja v obdelovanec|This paper deals with the problem of defining the trajectory of a stiff burnishing tool that would be optimal from the point of view of surface quality. The basic goal of this work is to gain an insight into the very process from the microscopic aspect, with the primary focus on material flow and roughness variations. Based on theoretical considerations, we planned an experiment with the aim to verify the initial hypotheses about the analysis of roughness change and a determination of the optimal depth of the workpiece penetration. Through matching and the superposition of surface profiles formed at various contact pressures, i.e., various burnishing forces and various penetration depths of the burnishing ball into the profile roughness, the phenomenon of roughness change was explained. Theoretical assumptions related to a determination of the optimum tool trajectory have largely been confirmed from the point of view of surface quality. The balls within the stiff tool system, which follow a predetermined depth of penetration into the roughness profile, very likely provide optimum surface quality, regardless of the initial machining. Based on experimental results, it is highly possible that the depth of the penetration of tool (burnishing ball) should equal the roughness profile height of the previously machined surface. The analysis of results obtained by the measurement of the surface roughness and the super-positioning of the profiles obtained by burnishing with various burnishing forces, significantly contributed to the explanation of the roughness peaks' deformation phenomenon. The proposed burnishing method could be of special importance in the burnishing of roughly machined surfaces, where Rsubp reaches high values. Investigations presented in this paper open a number of new directions, such as the testing of a stiff tool system with various workpiece materials and burnishing regimes, with different surface roughnesses as the result of the initial machining. We believe that the proposed model can significantly improve our present knowledge of the burnishing processČlanek obravnava problem določanja optimalne trajektorije togega gladilnega orodja glede na kvaliteto površine. Osnovni cilj tega dela je vpogled v postopek obdelave na mikroskopskem nivoju, osredinjen na tečenje materiala in spreminjanje hrapavosti površine. Na osnovi teoretičnega raziskovanja so avtorji pripravili preizkus za potrditev začetne hipoteze o spremembi hrapavosti in določanju optimalne globine prodiranja v obdelovanec. Z usklajevanjem in predpostavljanjem profila površine, ki nastane pri različnih pritiskih, to je z različnimi silami pri gladilnem valjanju in za različne globine prodiranja gladilnih kroglic na profil hrapavosti, je bil pojasnjen pojav spreminjanja hrapavosti. Teoretične predpostavke za določanje optimalne poti orodja so bile potrjene s stališča kvalitete površine. Kroglice v togem orodju, ki sledijo vnaprej določenemu prodiranju v profil hrapavosti, zelo verjetno zagotavljajo optimalno kvaliteto površine, ne glede na predhodno obdelavo površine. Na osnovi eksperimentalnih rezultatov je najbolj verjetno, da naj bi bila globina prodiranja orodja (gladilne kroglice) enaka višini profila hrapavosti predhodno obdelane površine. Analiza rezultatov, dobljenih z meritvami hrapavosti površine, dobljene pri gladilnem valjanju z različnimi silami gladilnega valjanja, je pomembno prispevala k razjasnitvi pojava hrapavosti. Predlagana metoda glajenja je lahko pomembna pri gladilnem valjanju grobo obdelanih površin, kjer Rspodajp dosega velike vrednosti. Raziskave, predstavljene v tem prispevku, odpirajo številne nove smeri, kot so preizkušanje sistemov togih orodij z različnimi materiali obdelovancev in režimi gladilnega valjanja pri različnih hrapavostih iz predhodne obdelave. Avtorji menijo, da predlagani model lahko pomembno prispeva k sedanjemu poznanju postopkov glajenja površinTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije