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Embargo period 2025-11-21
master's thesis
Klasifikacija tvrdoće obratka kod bušenja kamena primjenom sila rezanja i jakosti struja pogonskih motora stroja
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. urn:nbn:hr:235:294263
Džamonja, Kristijan
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

Džamonja, K. (2023). Klasifikacija tvrdoće obratka kod bušenja kamena primjenom sila rezanja i jakosti struja pogonskih motora stroja (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:294263

Džamonja, Kristijan. "Klasifikacija tvrdoće obratka kod bušenja kamena primjenom sila rezanja i jakosti struja pogonskih motora stroja." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. https://urn.nsk.hr/urn:nbn:hr:235:294263

Džamonja, Kristijan. "Klasifikacija tvrdoće obratka kod bušenja kamena primjenom sila rezanja i jakosti struja pogonskih motora stroja." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. https://urn.nsk.hr/urn:nbn:hr:235:294263

Džamonja, K. (2023). 'Klasifikacija tvrdoće obratka kod bušenja kamena primjenom sila rezanja i jakosti struja pogonskih motora stroja', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 10 October 2024, https://urn.nsk.hr/urn:nbn:hr:235:294263

Džamonja K. Klasifikacija tvrdoće obratka kod bušenja kamena primjenom sila rezanja i jakosti struja pogonskih motora stroja [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2023 [cited 2024 October 10] Available at: https://urn.nsk.hr/urn:nbn:hr:235:294263

K. Džamonja, "Klasifikacija tvrdoće obratka kod bušenja kamena primjenom sila rezanja i jakosti struja pogonskih motora stroja", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:235:294263

Metadata
TitleKlasifikacija tvrdoće obratka kod bušenja kamena primjenom sila rezanja i jakosti struja pogonskih motora stroja
Title (english)Workpiece hardness classification in stone drilling using cutting forces and servomotor current signals
AuthorKristijan Džamonja
MentorDanko Brezak (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2023-12-07, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Production Mechanical Engineering
Abstract
Kamen je izrazito heterogen i anizotropan materijal karakteriziran svojim mineralnim sastavom, teksturom i strukturom. Varijacije fizikalno-kemijskih svojstava različitih vrsta kamena imaju značajan utjecaj na dinamiku obradnog procesa. Pritom je tvrdoća jedno od najznačajnijih svojstava kamena s direktnim utjecajem na sile rezanja. Varijacije tvrdoće u zoni rezanja često utječu na povećanu dinamiku trošenja reznog alata, što posljedično može utjecati i na lom alata i/ili obratka. Stoga je određivanje tvrdoće obratka za vrijeme obrade kamena i sličnih izrazito nehomogenih materijala istovremeno izazovan zadatak, ali i nužan segment nadzora obradnih sustava i procesa. Posebnost ovog rada je analiza utjecaja signala sila rezanja i jakosti struja pogonskih motora stroja u klasifikaciji tvrdoće kamenih obradaka bušenih novodizajniranim svrdlom s kanalom za ispuhivanje. Primjena navedene vrste svrdla je u laboratorijskim uvjetima pokazala značajno manje sile rezanja, vibracije i intenzitet trošenja rezne oštrice. Postupak klasifikacije tvrdoće proveden je primjenom neuronske mreže s radijalnim baznim funkcijama, a sa svrhom povećanja robusnosti modela za klasifikaciju istrošenosti alata i tvrdoće kamena.
Abstract (english)
Stone is an extremely heterogeneous and anisotropic material characterized by its mineral composition, texture, and structure. Variations in the physio-chemical properties of different types of stone have a significant impact on the dynamics of the machining process. Hardness is one of the most important properties of stone, directly influencing cutting forces. Variations in hardness within the cutting zone often affect increased dynamics of tool wear, consequently potentially influencing tool breakage and/or workpiece damage. Therefore, determining the hardness of the workpiece during the processing of stone and similar highly heterogeneous materials is simultaneously a challenging task and a necessary aspect of monitoring of machining systems and processes. The objective of this study is to analyse the influence of cutting force and servomotor current signals on the classification of the hardness of stone workpieces drilled with a newly designed drill bit featuring an internal cooling channel. The application of this type of drill bit in laboratory conditions demonstrated significantly reduced cutting forces, vibrations, and cutting-edge wear intensity. The hardness classification procedure was carried out using a neural network with a radial basis function, aiming to enhance the robustness of the model for classifying tool wear and stone hardness.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:294263
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsEmbargoed access
Embargo expiration date: 2025-11-21
Terms of useLicence In copyright icon
Created on2023-12-01 08:18:19