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Advances in understanding of damage formation during laser-assisted milling of ZnO-based varistor ceramics
ID
Muženič, David
(
Author
),
ID
Kramar, Davorin
(
Author
),
ID
Pušavec, Franci
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S1526612522007812
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Abstract
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.
Language:
English
Keywords:
laser-assisted milling
,
ZnO ceramics
,
thermal model
,
damage formation
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2022
Number of pages:
Str. 1478-1491
Numbering:
Vol. 84
PID:
20.500.12556/RUL-143838
UDC:
621.7
ISSN on article:
1526-6125
DOI:
10.1016/j.jmapro.2022.11.008
COBISS.SI-ID:
130224387
Publication date in RUL:
13.01.2023
Views:
888
Downloads:
111
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Record is a part of a journal
Title:
Journal of manufacturing processes
Shortened title:
J. manuf. process.
Publisher:
Elsevier, Society of Manufacturing Engineers
ISSN:
1526-6125
COBISS.SI-ID:
1281557
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
lasersko rezkanje
,
ZnO keramika
,
toplotni modeli
,
nastanek poškodb
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0266
Name:
Napredne izdelovalne tehnologije za visokokakovostno in trajnostno proizvodnjo
Funder:
ARRS - Slovenian Research Agency
Project number:
L2-1836
Name:
Razvoj in implementacija inovativne tehnologije obdelave ZnO keramike z definirano rezalno geometrijo v serijsko proizvodnjo za povečanje kakovosti varistorjev kot končnih izdelkov
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