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doctoral thesis
Model dubokoga mikrobušenja potpomognutoga vibracijama
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. urn:nbn:hr:235:124641
Todić, Rajko
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

Todić, R. (2018). Model dubokoga mikrobušenja potpomognutoga vibracijama (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:124641

Todić, Rajko. "Model dubokoga mikrobušenja potpomognutoga vibracijama." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. https://urn.nsk.hr/urn:nbn:hr:235:124641

Todić, Rajko. "Model dubokoga mikrobušenja potpomognutoga vibracijama." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. https://urn.nsk.hr/urn:nbn:hr:235:124641

Todić, R. (2018). 'Model dubokoga mikrobušenja potpomognutoga vibracijama', Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 30 November 2024, https://urn.nsk.hr/urn:nbn:hr:235:124641

Todić R. Model dubokoga mikrobušenja potpomognutoga vibracijama [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2018 [cited 2024 November 30] Available at: https://urn.nsk.hr/urn:nbn:hr:235:124641

R. Todić, "Model dubokoga mikrobušenja potpomognutoga vibracijama", Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:235:124641

Metadata
TitleModel dubokoga mikrobušenja potpomognutoga vibracijama
Title (english)Model of vibration assisted deep hole micro drilling
AuthorRajko Todić
MBZ: 253571
MentorToma Udiljak (mentor)
Committee memberDamir Ciglar (predsjednik povjerenstva)
Committee memberToma Udiljak (član povjerenstva)
Committee memberGoran Cukor (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2018-04-25, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Production Mechanical Engineering
Universal decimal classification
(UDC)		621 - Mechanical engineering. Nuclear technology. Machinery
620 - Materials testing. Power stations. Economics of energy
Abstract
U radu je predstavljen pregled rezultata istraživanja dubokoga mikrobušenja i dubokoga bušenja potpomognutoga vibracijama. Nakon pregleda stanja dosadašnjih istraživanja, preko kinematičke analize trajektorija glavnih oštrica svrdla utvrdio se utjecaj parametara vibracija u ovisnosti o parametrima bušenja na debljinu odvojenih čestica prije deformacije, koja ima utjecaj na sile rezanja i veličinu odvojenih čestica. Provedena je eksperimentalna analiza konvencionalnog i mikrobušenja potpomognutog vibracijama, uz periodičko izvlačenje svrdla, mjerenjem odzivnih veličina aksijalne sile i momenta bušenja preko planiranih eksperimenata. Za analizu utvrđivanja značajnosti utjecaja odabranih parametara na odzivne veličine, koristila se metoda odzivne površine. Za promatrani raspon parametara, izrađeni su matematički modeli odziva aksijalne sile i momenta konvencionalnog i mikrobušenja potpomognutoga vibracijama, u ovisnosti o parametrima bušenja, vibracija i dubine provrta. Usporedbom eksperimentalnih rezultata i oba modela, utvrđeno je kako bušenje potpomognuto vibracijama prvenstveno pogoduje na smanjenje ukupnog momenta mikrobušenja za određeni skup parametara. Smanjenje momenta povezano je s manjim odvojenim česticama i time smanjenom vjerojatnosti začepljenja utora spirale mikrosvrdla i manjim trenjem prilikom dubokoga mikrobušenja. Načinjena je usporedba vijeka trajanja svrdla između konvencionalnog mikrobušenja i onog potpomognutoga vibracijama za proces s većom dubinom koraka ciklusa bušenja s periodičkim izvlačenjem svrdla. Kod dubokoga mikrobušenja potpomognutoga vibracijama ustanovljeno je kako postignuto smanjenje ukupnog momenta bušenja, u kombinaciji s adekvatnom veličinom aksijalne sile, može osigurati prosječno veći broj probušenih provrta prije loma svrdla i time pouzdaniji proces dubokoga mikrobušenja.
Abstract (english)
This work presents research results from the investigation of the deep hole micro drilling and the vibration assisted deep hole micro drilling. Literature survey and the kinematic analysis of the main cutting edges trajectories for the vibration assisted drilling were performed. Influence of the vibration and drilling parameters on undeformed chip thickness is determined, which is directly related with the chip size and the cutting forces. Experimental analysis of conventional and vibration assisted peck micro drilling was performed using the design of experiments. Measured axial force and drilling torque were used as the response variables. Statistical assessment of the significance of the parameters on the response variables is performed with the response surface methodology. For the analysed range of parameters, mathematical models for the axial force and drilling torque of the conventional and vibration assisted micro drilling were created, in relation with the drilling and vibration parameters, as well as the hole depth. Comparison of experimental results and both models showed that, for a certain set of parameters, the vibration assisted drilling has a primary benefit in the form of reduced drilling torque. This is related to smaller chip size, which in turn, leads to reducing the probability of the chip jamming in the micro drill flute and reduced friction during the deep hole micro drilling. For peck drilling, analysis of the drill lifetime for both conventional and vibration assisted micro drilling was performed. It was concluded that for deep hole vibration assisted micro drilling, the reduction in the drilling torque with the combination of adequate axial force, can provide larger number of drilled holes before the drill breaks and thus a more reliable deep hole micro drilling process.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:124641
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 on2020-04-08 21:27:57