Surface finishing and tool wear in single point diamond turning of chemical vapour deposited tungsten carbide hard coatings

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dc.contributor.authorMicallef, Christian
dc.contributor.authorZhuk, Yuri
dc.contributor.authorAria, Adrianus Indrat
dc.date.accessioned2022-09-16T09:46:23Z
dc.date.available2022-09-16T09:46:23Z
dc.date.issued2022-09-09
dc.description.abstractPrecision-engineered components which operate in demanding conditions often require the application of hard coatings such as tungsten carbide (WC) to improve their functional properties. Following the coating deposition process, a surface finishing or machining operation is often required to correct the sizing or achieve adherence to geometrical tolerancing and surface finish requirements. Single point diamond turning (SPDT) is a widely used ultraprecision machining technique for the fabrication of high-end engineering components made up of ductile materials, making it a desirable technique as a post-coating machining or finishing process. In this study the machinability of hard CVD W/WC coatings with a hardness of 1120 ± 15 HV and a thickness of 100 μm using SPDT was investigated. Here we report the results of axial and transverse turning using a cutting speed of 600 rpm and feed rates of 1 and 5 μm respectively. Experimental results show that an Ra of 0.2 μm is achieved with a diamond tool having a 0.5 mm nose radius. Significant tool wear was observed at the rake/flank edge of the diamond tool due to the coating's hardness. Surface and cross-sectional analysis of the samples' machined areas revealed presence of adhesive and abrasive wear. The occurrence of material pile-up due to tool loading on the surface of the coating was investigated through the indentation technique which demonstrated the occurrence of material deformation contributing to the overall surface roughness.en_UK
dc.identifier.citationMicallef C, Zhuk Y, Aria AI. (2022) Surface finishing and tool wear in single point diamond turning of chemical vapour deposited tungsten carbide hard coatings. Surface and Coatings Technology, Volume 447, October 2022, Article number 128864en_UK
dc.identifier.issn0257-8972
dc.identifier.urihttps://doi.org/10.1016/j.surfcoat.2022.128864
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18456
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectDiamond turningen_UK
dc.subjectSPDTen_UK
dc.subjectTungsten carbideen_UK
dc.subjectTool wearen_UK
dc.subjectPlastic side-flowen_UK
dc.titleSurface finishing and tool wear in single point diamond turning of chemical vapour deposited tungsten carbide hard coatingsen_UK
dc.typeArticleen_UK

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