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Trenje pri procesih hladnega masivnega preoblikovanja = [Friction in cold bulk metal forming] : magisterijPfeifer, Ervin, 1967-Glavni namen pričujoče naloge je ocena sposobnosti procesa kombiniranega protismernega in istosmernega iztiskavanja za količinsko določevanje vrednosti stičnega trenja in kakovostno ocenjevanje ... mehanizmov mazanja. Raziskovalno delo je na osnovi analiz treh različnih preoblikovalnih materialov v kombinacijah s tremi različnimi mazivi, obsegalo medsebojno prepletena področja (1) določevanja primerjalnih vrednosti stičnega trenja, (2) numerične simulacije procesa kombiniranega iztiskavanja z uporabo metode končnih elementov in (3) potrditev teoretičnih predvidevanj na podlagi izvedbe statistično opravičljivih fizičnih preizkusov. Tribološke razmere v medsebojnem dotiku med preoblikovalnim orodjem in preoblikovancem so bile popisane z uporabo treh različnih teoretičnih modelov trenja: (a) Coulombovega zakona trenja, ▫$\tau$▫=▫$\mu$▫p, (b) zakona konstantne strižne torne napetosti, ▫$\tau$▫=mk, in (c) splošnega zakona trenja, ▫$\tau$▫=f▫$\alpha$▫k. Rezultati kažejo na visoko stopnjo občutljivosti procesa kombiniranega iztiskavanja pri določevanju najmanjših sprememb v pogojih stičnega trenja, ter glede na enostavnost operativnega poteka metode preizkušanja in primerno geometrijo preoblikovalnega orodja na splošno uporabnost tako v pogojih laboratorijskega preizkuševanja, kot tudi ob razmerah dejanske industrijske proizvodnje. Preizkus je bil, z ozirom na ugotovljene lastnosti, predlagan za novo metodo količinskega in kakovostnega določevanja vrednosti stičnega trenja pri zahtevnih pogojih procesov hladnega masivnega preoblikovanja.Type of material - master's thesisPublication and manufacture - Ljubljana : [E. Pfeifer], 1995Language - slovenianCOBISS.SI-ID - 1158171
Author
Pfeifer, Ervin, 1967-
Other authors
Kuzman, Karl, 1941-2022 |
Bay, Niels
Topics
hladno preoblikovanje |
masivno preoblikovanje |
hladno nakrčevanje |
iztiskavanje |
parametri iztiskavanja |
numerično simuliranje
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Library/institution |
City | Acronym | For loan | Other holdings |
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Faculty of Mechanical Engineering, Ljubljana | Ljubljana | FSLJ |
reading room 1 cop.
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National and University Library, Ljubljana | Ljubljana | NUK |
reading room 1 cop.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Pfeifer, Ervin, 1967- | 14067 |
Kuzman, Karl, 1941-2022 | 00807 |
Source: Personal bibliographies
and: SICRIS
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