Utjecaj geometrije svrdla i parametara obrade na trošenje oštrice pri bušenju kamena

master's thesis

• Title (english): Influence of drill geometry and cutting data on tool wear at stone drilling
• Author: Miljenko Peček
• Mentor: Toma Udiljak (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2015-07-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Kada se ispituje trošenje alata postoji niz modela trošenja koji se uglavnom primjenjuju kod obrade metalnih materijala, ali ima mali broj onih za procjenu trošenja nehomogenih materijala, kao što je primjerice kamen . U teorijskom dijelu ovog rada biti će prikazani osnovni uzroci i mehanizmi trošenja alata, kao i oblici trošenja alata koji se mogu pojaviti zbog različitih uvjeta u kojima se nalazi alat tijekom obrade. Opisat će se Taylor-ov model trošenja i prikazati utjecaj različitih parametara obrade na trošenje alata. Kako će se u eksperimentalnom dijelu obrađivati kamen, u teorijskom dijelu će još biti obrađen utjecaj različitih materijala na trošenje alata, koji se koriste za obradu kamena. Detaljno će biti opisani postupci trošenja takvih alata, odnosno uvid u strukturu alata i procese koji se zbivaju tijekom obrade. Praćenje istrošenosti alata je veoma važno zbog pravovremene i brze reakcije s kojom se čuva alat, a time i kvaliteta proizvoda. U eksperimentalnom dijelu provodit će se bušenje kamena te će se pratiti utjecaj istrošenosti alata na vrijednosti posmične sile te vrijednosti struja glavnog i posmičnog motora. Nakon bušenja određenog broj provrta oštrice, svrdla će se slikati te će se procijeniti stupanj istrošenosti i usporediti iznos trošenja s izbušenom duljinom, kao i promjena sila i struje glavnog motora u odnosu na istrošenost alata.

Abstract (english)

In examination of tool wear there is a lot of models that concern tool wear at cutting metallic materials but little number of those which concern evaluation of wear when cutting heterogeneous materials, for example a stone. In first part of this paper there will be shown basic causes and mechanism of tool wear, and also different types of tool wear that can appear due to different cutting conditions during cutting process. Taylor model of tool wear and influence of different process parameters on tool will be described. Because stone material will be used in experimental part of this paper, an influence of different materials on tool wear, which are commonly used in stone machining, will be shown. Detailed view of tool wear and processes which happen during machining will be presented. Tool wear monitoring is very important due to timely and quick response which helps to save the quality of the product. In the experiment section a drilling of stone material will be conducted and force and current of main spindle and feed motor will be monitored. After certain number of drilled holes tool cutting edges, using special camera, will be photographed and they will be used to evaluate a degree of tool wear and compare it to overall drilling length, with comparison to respective changes of force applied on tool and main spindle motor current.

• Keywords: svrdlo; kamen; trošenje; bušenje
• Keywords (english): drill bit; stone; wear; drilling
• Language: croatian
• URN:NBN: urn:nbn:hr:235:048706
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-22 13:37:05