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doctoral thesis
Plitko gravurno kovanje s aspekta mikrooblikovanja
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2010. urn:nbn:hr:235:051559
Keran, Zdenka
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

Keran, Z. (2010). Plitko gravurno kovanje s aspekta mikrooblikovanja (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:051559

Keran, Zdenka. "Plitko gravurno kovanje s aspekta mikrooblikovanja." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2010. https://urn.nsk.hr/urn:nbn:hr:235:051559

Keran, Zdenka. "Plitko gravurno kovanje s aspekta mikrooblikovanja." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2010. https://urn.nsk.hr/urn:nbn:hr:235:051559

Keran, Z. (2010). 'Plitko gravurno kovanje s aspekta mikrooblikovanja', Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 01 January 2025, https://urn.nsk.hr/urn:nbn:hr:235:051559

Keran Z. Plitko gravurno kovanje s aspekta mikrooblikovanja [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2010 [cited 2025 January 01] Available at: https://urn.nsk.hr/urn:nbn:hr:235:051559

Z. Keran, "Plitko gravurno kovanje s aspekta mikrooblikovanja", Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2010. Available at: https://urn.nsk.hr/urn:nbn:hr:235:051559

Metadata
TitlePlitko gravurno kovanje s aspekta mikrooblikovanja
Title (english)Microforming approach to coining technology
AuthorZdenka Keran
MentorMiljenko Math (mentor)
Committee memberFranjo Cajner (predsjednik povjerenstva)
Committee memberMiljenko Math (član povjerenstva)
Committee memberBojan Jerbić (član povjerenstva)
Committee memberToma Udiljak (član povjerenstva)
Committee memberBranko Grizelj (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2010-09-23, 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
U radu je provedena eksperimentalna i numerička analiza procesa plitkog gravurnog kovanja s aspekta mikrooblikovanja. To je novi pristup rješavanju problema oblikovanja proizvoda malih dimenzija koji uzima u obzir utjecaj veličine kristalnog zrna na parametre procesa. Izvršena su mjerenja elastičnog povrata materijala rondele početne visine 2 mm za tri različite veličine kristalnog zrna i to kod slobodnog kovanja i kovanja u gravuri. Mjerena je sila oblikovanja potrebna za zadovoljavajuće popunjavanje gravure ukovnja kod istih veličina zrna. \Načinjena je i numerička analiza promjene koeficijenta kontaktnog trenja također za različite veličine kristalnog zrna. Radom je pokazano kako se prilikom plitkog gravurnog kovanja javlja značajna razlika u ponašanju materijala obratka kod različitih veličina kristalnog zrna te oprečno ponašanje parametara procesa prilikom slobodnog kovanja i kovanja u gravuri. Time je proces plitkog gravurnog kovanja nesumnjivo svrstan u procese mikrooblikovanja. Numeričkom analizom dobivena je teorijska zavisnost promjene veličine kontaktnog trenja obzirom na promjenu veličine kristalnog zrna kod specifičnog slučaja slobodnog kovanja.
Abstract (english)
The work presents an experimental and numerical analysis of coining process in terms of microforming. This is a new approach to solving the problems of small-sized products design that takes into account the influence of crystalline grain size on the process parameters. Measurements of elastic springback were made on roundels which initial height is 2 mm. This was done for three different grain sizes and also for the open and closed die forging processes. The force required for the satisfactory die filling was measured at the same grain sizes. A numerical analysis of friction coefficient changes was also made for different sizes of crystal grains. The work showed that during coining process a significant difference in the behaviour of workpiece material of different grain sizes appears and also the opposite behaviour of process parameters during open and closed die forging. This behavior classifies coining process into the group of microforming processes without any doubt. Numerical analysis showed theoretical friction coefficient dependence on grain size changes in speciffic case.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:051559
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 on2020-06-19 12:47:21