Diamond cutting tools wear behaviour analysed through diamond particles characterisation

master's thesis

• Title (croatian): Analiza trošenja dijamantnih reznih alata pomoću karakterizacije dijamantnih čestica
• Author: Matija Pisk
• Mentor: Božidar Matijević (mentor)
• Mentor: Ivan Kumić (komentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-07-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

This thesis highlights an approach in research and development of diamond materials for use in insert tools. ‘Diamond insert tools’ may be used on different construction jobs for the specific purposes of sawing, coring or grinding on concretes (heterogeneous) and masonry materials like brick and limestone (homogeneous). A diamond insert tool comprises a steel base (such as a saw blade centre, core bit barrel or cup wheel) and cutting elements. These cutting elements are in most cases metal-matrix composite segments with embedded diamond particles, as carriers of extreme hardness and therefore needed abrasive properties. The two principal performance characteristics of an insert tools are cutting speed and lifetime. These characteristics are commonly inverse hence, obtaining a simultaneous increase in cutting speeds and lifetime is proven to be quite challenging.

By performing diamond characterisation using the state-of-the-art techniques, the obtained characteristics will be assessed and used to detect the correlation with the insert tools behaviour. Optical microscopy, in conjunction with advanced imaging techniques, will provide insight into the better understanding of diamond wear state of the insert’s active surface throughout its life cycle. These results, influenced by varying geometries of the inserts and in relation with operational parameters like torque, cutting speeds, and feed rates, ensure that the evolution of diamonds’ state and its active failure modes are fully understood. These findings will enable better comprehension of diamond tools behaviour and performance in real-life application.

Abstract (croatian)

U ovom diplomskom radu istaknut je pristup istraživanja i razvoja dijamantnih materijala za upotrebu u reznim alatima. "Dijamantni rezni alati" mogu se koristiti u različitim građevinskim primjenama kao što su piljenje, jezgreno brušenje ili bušenje na zidanim materijalima poput opeke, vapnenca (homogeni materijal) i betona (heterogeni materijal).

Dijamantni alat sastoji se od čelične osnove (kao što je jezgra pile, cijev za jezgru ili kotača) i reznog elementa (neke vrste dijamanta). Ti su rezni elementi u većini slučajeva kompoziti sa metalnom matricom odnosno segmenti s ugrađenim česticama dijamanata kao nosača iznimne tvrdoće, a time i visokih abrazivnih svojstava. Dvije glavne karakteristike dijamantnih alata su brzina rezanja i vijek trajanja. Te su karakteristike obično recipročne, a dokazano je da je istodobno povećavanje brzine rezanja i vijeka trajanja alata poprilično izazovno.

Provođenjem karakterizacije dijamanata koristeći najsuvremenije tehnike, dobivene karakteristike ocjenjivat će se dovoditi u kontekst ponašanja alata u eksploataciji. Optička mikroskopija, u kombinaciji s naprednim tehnikama snimanja, pruža uvid u bolje razumijevanje stanja trošenja dijamanta aktivne površine umetka tijekom njegovog životnog ciklusa. Ovi rezultati, pod utjecajem različitih arhitektura segmenata i u odnosu na radne parametre poput zakretnog momenta, brzine rezanja i posmaka, osiguravaju potpuno razumijevanje evolucije stanja dijamanata i njihovih procesa degradacije. Ovi će rezultati omogućiti bolje razumijevanje ponašanja i performansi dijamantnih alata u stvarnoj primjeni.

• Keywords: diamond materials; diamonds insert tools
• Keywords (croatian): dijamant; dijamantni rezni alati
• Language: english
• URN:NBN: urn:nbn:hr:235:060364
• 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; Embargo expiration date: 2022-07-09
• Created on: 2020-07-07 11:52:32