Advances in understanding of damage formation during laser-assisted milling of ZnO-based varistor ceramics

Muženič, David (avtor), Kramar, Davorin (avtor), Pušavec, Franci (avtor)

Zinc oxide (ZnO)-based varistor ceramic is a hard-to-machine material. Its microstructure, developed for its electrical properties, results in extremely low fracture toughness. Therefore, the current state-of-the-art in machining this material is lapping. In the present work, laser-assisted milling (LAMill) of ZnO ceramics was evaluated with a systematic approach to allow for new insights and advance the understanding of damage formation during machining of this material. A machining strategy to machine ceramic workpieces along the edge was studied. Additionally, a new transient analytical thermal model was developed to accurately predict laser-induced temperatures near the edge of the workpiece without excessive use of computational power, and the model predictions were experimentally verified. A novel approach to evidence machining-induced damage with the mathematical description of the ideal machined surface was also designed and tested. It was found that at higher temperatures the propagation of intergranular fractures is inhibited. Another mechanism based on the material porosity and contributing to more instances of intergranular crack initiation has been identified. To reliably predict the extent of damage on the machined surface, the analysis has been extended by covering the effects of the two identified influential process parameters: feed per tooth, f$_z$, and the temperature of the to-be-cut material, T. By adjusting these parameters, surface damage was successfully controlled and the extent of damage was minimized at f$_z$ = 0.18 mm and T = 380 °C, achieving a 44 % reduction compared to the conventional process with the same machining parameters.

• Jezik: Angleški jezik
• Ključne besede: laser-assisted milling, ZnO ceramics, thermal model, damage formation
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: Str. 1478-1491
• Številčenje: Vol. 84
• PID: 20.500.12556/RUL-143838
• UDK: 621.7
• ISSN pri članku: 1526-6125
• DOI: 10.1016/j.jmapro.2022.11.008
• COBISS.SI-ID: 130224387
• Datum objave v RUL: 13.01.2023

Gradivo je del revije

• Naslov: Journal of manufacturing processes
• Skrajšan naslov: J. manuf. process.
• Založnik: Elsevier, Society of Manufacturing Engineers
• ISSN: 1526-6125
• COBISS.SI-ID: 1281557

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: lasersko rezkanje, ZnO keramika, toplotni modeli, nastanek poškodb

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0266
• Naslov: Napredne izdelovalne tehnologije za visokokakovostno in trajnostno proizvodnjo

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: L2-1836
• Naslov: Razvoj in implementacija inovativne tehnologije obdelave ZnO keramike z definirano rezalno geometrijo v serijsko proizvodnjo za povečanje kakovosti varistorjev kot končnih izdelkov