Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna

Piljek, Petar

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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

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APA 6th Edition

Piljek, P. (2017). Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna (Doctoral thesis). Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:180642

MLA 8th Edition

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

Chicago 17th Edition

Harvard

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 23 March 2023, https://urn.nsk.hr/urn:nbn:hr:235:180642

Vancouver

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 2023 March 23] Available at: https://urn.nsk.hr/urn:nbn:hr:235:180642

IEEE

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

Cite this item: https://urn.nsk.hr/urn:nbn:hr:235:180642

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Metadata

Title	Model plitkoga gravurnoga kovanja temeljen na veličini kristalnoga zrna
Title (english)	Closed die coining model based on grain size
Author	Petar Piljek
Mentor	Zdenka Keran (mentor)
Committee member	Damir Ciglar (predsjednik povjerenstva)
Committee member	Zdenka Keran (član povjerenstva)
Committee member	Branko Grizelj (član povjerenstva)
Granter	University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Zagreb
Defense date and country	2017-05-26, 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 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.
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 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.
Keywords
Keywords (english)
Language	croatian
URN:NBN	urn:nbn:hr:235:180642
Study programme	Title: 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 resource	Text
File origin	Born digital
Access conditions	Open access
Terms of use
Repository	Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb
Created on	2020-04-09 22:39:28