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doctoral thesis
Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. urn:nbn:hr:235:180642
Piljek, Petar
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Piljek, P. (2017). Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:180642

Piljek, Petar. "Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:180642

Piljek, Petar. "Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:180642

Piljek, P. (2017). 'Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna', Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 14 March 2025, https://urn.nsk.hr/urn:nbn:hr:235:180642

Piljek P. Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2017 [cited 2025 March 14] Available at: https://urn.nsk.hr/urn:nbn:hr:235:180642

P. Piljek, "Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna", Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:235:180642

Metadata
TitleModel plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna
Title (english)Closed die coining model based on grain size
AuthorPetar Piljek
MentorZdenka Keran (mentor)
Committee memberDamir Ciglar (predsjednik povjerenstva)
Committee memberZdenka Keran (član povjerenstva)
Committee memberBranko Grizelj (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2017-05-26, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Production Mechanical Engineering
Universal decimal classification
(UDC)		621 - Mechanical engineering. Nuclear technology. Machinery
Abstract
Poznato je da se proces plitkog gravurnog kovanja može uvrstiti u skupinu procesa mikro oblikovanja deformiranjem. Kod takvih procesa mikrostruktura i red veličine geometrije gravure imaju značajan utjecaj na mehanizam deformiranja te se mikro procesi fundamentalno razlikuju od klasičnih procesa oblikovanja. Zbog toga je potrebno odrediti utjecaj efekta veličine na silu kovanja i pomak alata kod procesa plitkog gravurnog kovanja. U tu svrhu istražen je utjecaj veličine kristalnog zrna... More materijala na elastični povrat materijala nakon prestanka djelovanja sile oblikovanja, popunjavanje gravure i silu kovanja otkovaka materijala. Materijal sirovaca (rondela) je 99,5% aluminij i koristi se gravura relativno složene geometrije. Predloženi model plitkog gravurnog kovanja uzima u obzir utjecaj efekata veličine na naprezanje plastičnog tečenja preko geometrije gravure te daje procjenu konačne sile kovanja i pripadajućeg pomaka alata. Time je omogućen kontroliran utjecaj veličine kristalnog zrna na silu kovanja i pomak alata, kao i pouzdana predikacija konačne sile kovanja i pomaka alata kod kojeg se postiže potpuno popunjavanje gravurne šupljine. Less
Abstract (english)
It is known that the coining process can be categorised as a micro forming process. In micro forming processes, the microstructure of the material and dimension scale of the forged geometry can have a substantial influence on the mechanism of material deformation. That is the essential difference between macro and micro forming processes. Influence of the grain size on the elastic springback of the material, filling of the die and the forging force in process of coining will be... More investigated in this study. The material of the billet is 99.5% aluminium and the die geometry is relatively complex. The presented model takes into account the influence of size effect on the material flow curve through engraving geometry and estimates the final forging force and corresponding associated displacement of the tool. This enables a controlled influence of the grain size on forming force and tool displacement and also a reliable prediction of final forging force and related tool displacement associated with a completely filled engraving cavity. Less
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:180642
Study programmeTitle: Mechanical Engineering and Naval Architecture
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-04-09 22:39:28
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