20.500.12556/RUL-132409 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 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 (f and V$_C$), 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. ZnO varistors machining optimization turning chipping accelerometer FFT plotting 3D topography ZnO varistorji optimizacija parametrov obdelave struženje formiranje odrezkov true false true Angleški jezik Slovenski jezik Članek v reviji 2021-10-25 10:19:08 2021-10-25 10:19:12 2022-09-12 04:12:19 0000-00-00 00:00:00 2021 0 0 20 str. iss. 8, art. 1422 Vol. 9 2021 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 621.941(045) 2227-9717 10.3390/pr9081422 80316675 RAZ_Dugar_Jaka_2021.pdf RAZ_Dugar_Jaka_2021.pdf 1 61667048DDE1434EC5628D5888A7006A 174a2f4e692b0a3328180e412aec6b88b346797b0e8c7258520a5baafa20a39c 26ac50fd-b0d3-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=155160 https://www.mdpi.com/2227-9717/9/8/1422 1 3550bb48-356c-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=150038 Fakulteta za strojništvo 0 0 0