Cargando…

Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills

The high-purity G5 graphite material is widely used for glass moulding and provides high hardness and brittleness because it is sintered to fine particles unlike other graphite materials. Hence, tool cutting of a G5 workpiece is performed by local fracture instead of plastic deformation of the machi...

Descripción completa

Detalles Bibliográficos
Autores principales: Lee, Hyeonhwa, Kim, Jinsoo, Park, Jeongyeon, Kim, Jongsu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9147727/
https://www.ncbi.nlm.nih.gov/pubmed/35630233
http://dx.doi.org/10.3390/mi13050766
_version_ 1784716878857371648
author Lee, Hyeonhwa
Kim, Jinsoo
Park, Jeongyeon
Kim, Jongsu
author_facet Lee, Hyeonhwa
Kim, Jinsoo
Park, Jeongyeon
Kim, Jongsu
author_sort Lee, Hyeonhwa
collection PubMed
description The high-purity G5 graphite material is widely used for glass moulding and provides high hardness and brittleness because it is sintered to fine particles unlike other graphite materials. Hence, tool cutting of a G5 workpiece is performed by local fracture instead of plastic deformation of the machined surface. Although a diamond-coated tool with outstanding hardness is used to machine very hard graphite, the tool shows variability regarding the service life and machining performance depending on the grain size, even in the same machining environment. We investigated the wear and change trend of machined surface roughness considering microcrystalline diamond (MCD) and nanocrystalline diamond (NCD)-coated tools, which are generally used to machine graphite materials, and analysed their relation with coating. For rough machining, the MCD-coated tool, for which the delamination of coating occurred later, showed less wear and improved machined surface roughness. For precision machining, the NCD tool showed less tool wear rate relative to the cutting length, leading to a small difference in the machined surface roughness between the two tools. We conclude that if rough and precision machining processes are performed using the same cutting tool, the MCD-coated tool is advantageous in terms of service life, while the difference in roughness of the final machined surface between the tools is negligible.
format Online
Article
Text
id pubmed-9147727
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-91477272022-05-29 Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills Lee, Hyeonhwa Kim, Jinsoo Park, Jeongyeon Kim, Jongsu Micromachines (Basel) Article The high-purity G5 graphite material is widely used for glass moulding and provides high hardness and brittleness because it is sintered to fine particles unlike other graphite materials. Hence, tool cutting of a G5 workpiece is performed by local fracture instead of plastic deformation of the machined surface. Although a diamond-coated tool with outstanding hardness is used to machine very hard graphite, the tool shows variability regarding the service life and machining performance depending on the grain size, even in the same machining environment. We investigated the wear and change trend of machined surface roughness considering microcrystalline diamond (MCD) and nanocrystalline diamond (NCD)-coated tools, which are generally used to machine graphite materials, and analysed their relation with coating. For rough machining, the MCD-coated tool, for which the delamination of coating occurred later, showed less wear and improved machined surface roughness. For precision machining, the NCD tool showed less tool wear rate relative to the cutting length, leading to a small difference in the machined surface roughness between the two tools. We conclude that if rough and precision machining processes are performed using the same cutting tool, the MCD-coated tool is advantageous in terms of service life, while the difference in roughness of the final machined surface between the tools is negligible. MDPI 2022-05-13 /pmc/articles/PMC9147727/ /pubmed/35630233 http://dx.doi.org/10.3390/mi13050766 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lee, Hyeonhwa
Kim, Jinsoo
Park, Jeongyeon
Kim, Jongsu
Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills
title Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills
title_full Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills
title_fullStr Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills
title_full_unstemmed Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills
title_short Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills
title_sort analysis of tool wear and roughness of graphite surfaces machined using mcd and ncd-coated ball endmills
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9147727/
https://www.ncbi.nlm.nih.gov/pubmed/35630233
http://dx.doi.org/10.3390/mi13050766
work_keys_str_mv AT leehyeonhwa analysisoftoolwearandroughnessofgraphitesurfacesmachinedusingmcdandncdcoatedballendmills
AT kimjinsoo analysisoftoolwearandroughnessofgraphitesurfacesmachinedusingmcdandncdcoatedballendmills
AT parkjeongyeon analysisoftoolwearandroughnessofgraphitesurfacesmachinedusingmcdandncdcoatedballendmills
AT kimjongsu analysisoftoolwearandroughnessofgraphitesurfacesmachinedusingmcdandncdcoatedballendmills