Evaluation of Chip Formation Mechanisms in the Turning of Sintered ZnO Electro-Ceramics
The sintered zinc oxide (ZnO) electro-ceramics are a brittle class of hard-to-cut materials such that shaping them with the post-finishing operations necessitates careful handling and precision machining. The conventional machining approach using the grinding and lapping processes represents limited...
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doaj-31ae52493f8449ec8e69727a93ffd2e92021-08-26T14:16:25ZengMDPI AGProcesses2227-97172021-08-0191422142210.3390/pr9081422Evaluation of Chip Formation Mechanisms in the Turning of Sintered ZnO Electro-CeramicsJaka Dugar0Awais Ikram1Franci Pušavec2Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva cesta 6, SI-1000 Ljubljana, SloveniaFaculty of Mechanical Engineering, University of Ljubljana, Aškerčeva cesta 6, SI-1000 Ljubljana, SloveniaFaculty of Mechanical Engineering, University of Ljubljana, Aškerčeva cesta 6, SI-1000 Ljubljana, SloveniaThe sintered zinc oxide (ZnO) electro-ceramics are a brittle class of hard-to-cut materials such that shaping them with the post-finishing operations necessitates careful handling and precision machining. The conventional machining approach using the grinding and lapping processes represents limited productivity, an inability to produce the required geometries and frequent uncontrolled chipping of the edges of the final products. This study thus investigates the turning performance of dense sintered ZnO varistors and chip formations to obtain the parametric range (cutting mechanism) which causes the chipping or the trans-granular/sudden failure in these brittle materials. With the analysis of the cutting tool vibration in relation to the machining parameters (<i>f</i> and <i>V<sub>C</sub></i>), the vibration-induced chipping correlations are made and interlinked with the occurrence of grain pull-out during the turning operation. The results show that the reflected vibratory motion of the tools is directly correlated with the chip formation mechanisms in the turning of ZnO ceramics and thus provide robust measurements for quality assurance in final products.https://www.mdpi.com/2227-9717/9/8/1422ZnO varistorsmachining optimizationturningchippingaccelerometerFFT plotting |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jaka Dugar Awais Ikram Franci Pušavec |
spellingShingle |
Jaka Dugar Awais Ikram Franci Pušavec Evaluation of Chip Formation Mechanisms in the Turning of Sintered ZnO Electro-Ceramics Processes ZnO varistors machining optimization turning chipping accelerometer FFT plotting |
author_facet |
Jaka Dugar Awais Ikram Franci Pušavec |
author_sort |
Jaka Dugar |
title |
Evaluation of Chip Formation Mechanisms in the Turning of Sintered ZnO Electro-Ceramics |
title_short |
Evaluation of Chip Formation Mechanisms in the Turning of Sintered ZnO Electro-Ceramics |
title_full |
Evaluation of Chip Formation Mechanisms in the Turning of Sintered ZnO Electro-Ceramics |
title_fullStr |
Evaluation of Chip Formation Mechanisms in the Turning of Sintered ZnO Electro-Ceramics |
title_full_unstemmed |
Evaluation of Chip Formation Mechanisms in the Turning of Sintered ZnO Electro-Ceramics |
title_sort |
evaluation of chip formation mechanisms in the turning of sintered zno electro-ceramics |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2021-08-01 |
description |
The sintered zinc oxide (ZnO) electro-ceramics are a brittle class of hard-to-cut materials such that shaping them with the post-finishing operations necessitates careful handling and precision machining. The conventional machining approach using the grinding and lapping processes represents limited productivity, an inability to produce the required geometries and frequent uncontrolled chipping of the edges of the final products. This study thus investigates the turning performance of dense sintered ZnO varistors and chip formations to obtain the parametric range (cutting mechanism) which causes the chipping or the trans-granular/sudden failure in these brittle materials. With the analysis of the cutting tool vibration in relation to the machining parameters (<i>f</i> and <i>V<sub>C</sub></i>), the vibration-induced chipping correlations are made and interlinked with the occurrence of grain pull-out during the turning operation. The results show that the reflected vibratory motion of the tools is directly correlated with the chip formation mechanisms in the turning of ZnO ceramics and thus provide robust measurements for quality assurance in final products. |
topic |
ZnO varistors machining optimization turning chipping accelerometer FFT plotting |
url |
https://www.mdpi.com/2227-9717/9/8/1422 |
work_keys_str_mv |
AT jakadugar evaluationofchipformationmechanismsintheturningofsinteredznoelectroceramics AT awaisikram evaluationofchipformationmechanismsintheturningofsinteredznoelectroceramics AT francipusavec evaluationofchipformationmechanismsintheturningofsinteredznoelectroceramics |
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1721190361273991168 |