Thermal degradation of cemented-carbide cutting inserts and influence of dry cutting on repen limestone

Kortnik, Jože (author), Zupančič, Matej (author), Zaky, Adam (author), Markoli, Boštjan (author)

This paper presents the results of a thermographic analysis of Fantini Sandvik H6T cutting inserts during the dry cutting of dimension stone – Repen limestone – using a Fantini 70-RA-BU bank chainsaw machine in the underground rooms of the Debela Griža quarry, Slovenia. It is known from literature that the temperature reached at the contact between a cutting insert and stone is also an important factor affecting the service life and cutting performance when cutting dimension stone. Furthermore, the critical temperature for thermal damage during granite cutting was identified as 100–200°C, while for cutting sandstone or limestone, it was 100°C. Specimens of the used H6T cutting inserts were subjected to a detailed metallographic investigation to evaluate the changes in the surface structure and hardness. Additionally, possible reasons for the wear of cutting inserts due to the contact temperature and surface tension were discussed.

• Language: English
• Keywords: chainsaw machine, dimension stone, thermographic analysis, cutting inserts
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Publication status: Published
• Publication version: Version of Record
• Publication date: 10.10.2025
• Publisher: Inštitut za kovinske materiale in tehnologije
• Year: 2025
• Number of pages: str. 911-916
• Numbering: Letn. 59, št. 6
• PID: 20.500.12556/RUL-177859
• UDC: 666.61:544.016.2:543.573
• ISSN on article: 1580-2949
• DOI: 10.17222/mit.2025.1554
• COBISS.SI-ID: 261778435
• Publication date in RUL: 17.02.2026

Record is a part of a journal

• Title: Materiali in tehnologije
• Shortened title: Mater. tehnol.
• Publisher: Inštitut za kovinske materiale in tehnologije
• ISSN: 1580-2949
• COBISS.SI-ID: 106193664

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Title: Termična degradacija rezalnega orodja iz karbidne trdine in vpliv metode suhega žaganja repenskega apnenca

Abstract

V članku avtorji predstavljajo rezultate termografske analize (TGA) rezalnih ploščic Fantini Sandvik H6T pri suhem (nemazanem) načina rezanja naravnega kamna – Repenskega apnenca s tirno verižno žago Fantini 70-RA-BU v podzemnih prostorih kamnoloma Debela Griža na Krasu. Iz literaturnih virov je znano, da je dosežena temperatura na kontaktu med rezalno ploščico in obdelovancem pomemben dejavnik, ki zelo vpliva na življenjsko dobo rezalne ploščice in zmogljivost rezanja kamna nasploh. Raziskana in potrjena je bila možnost začetka toplotne degradacije pri rezanju blokov naravnega kamna, ki se glede na literaturne vire v primeru magmatskih kamnin (granita) prične pri temperaturah okoli 200°C in v primeru sedimentnih kamnin (peščenjak/apnenec) okoli 100°C. Vzorci uporabljenih rezalnih ploščic H6T so bili podvrženi podrobni metalografski preiskavi za oceno sprememb površinske strukture in trdote. Poleg tega so bili obravnavani možni vzroki za obrabo rezalnih ploščic zaradi kontaktne temperature in površinske napetosti.

• Keywords: naravni kamen, termografska analiza, verižna žaga, rezilne ploščice