20.500.12556/RUL-177859 Thermal degradation of cemented-carbide cutting inserts and influence of dry cutting on repen limestone Termična degradacija rezalnega orodja iz karbidne trdine in vpliv metode suhega žaganja repenskega apnenca 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. 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. chainsaw machine dimension stone thermographic analysis cutting inserts naravni kamen termografska analiza verižna žaga rezilne ploščice true false false Inštitut za kovinske materiale in tehnologije Angleški jezik Slovenski jezik Članek v reviji 2026-01-10 04:30:35 2026-02-17 10:30:10 2026-02-18 04:22:26 0000-00-00 00:00:00 2025 0 0 str. 911-916 št. 6 Letn. 59 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-10-10 666.61:544.016.2:543.573 1580-2949 10.17222/mit.2025.1554 261778435 https://mater-tehnol.si/index.php/MatTech/article/view/1554 1 b7361d56-edd4-11f0-bf92-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=225240 1554-Article_Text-7462-1-10-20251211_(1).pdf 1554-Article_Text-7462-1-10-20251211_(1).pdf 1 F7DE54FB2A3F6A22D7F118985D7DAE35 358469cddb87a990ae71d1b6be2ebc8de582d3b844c2f5004fe7f25d5bf524cf 540c7444-0be2-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=228169 Naravoslovnotehniška fakulteta 0 0 0