Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Attrition wear in polycrystalline diamond cutting tools during machining of aluminium
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2023 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Extensive research has been conducted to investigate the wear behaviour of cutting tools machining steels, cast irons, Ti- and Ni-alloys. However, it exist a noticeable research gap when it comes to wear of polycrystalline diamond (PCD) tools during machining of aluminium. Given the expected increase in demand for aluminium components to replace steel in the automotive sector as a result of the transition from internal combustion engine vehicles to electric cars, driven by their superior strength-to-weight ratio, it is imperative to improve the efciency and capabilities of PCD cutting inserts while machining aluminium. Sandvik Coromant conducted an intensive machining test campaign to gain a comprehensive understanding of how this wear manifests. As a result of their research, a hypothesis was formulated suggesting that attrition wear occurs. The hypothesis proposed that, during the machining process, diamond grains become loosened from the PCD edge, thus damaging the cutting insert.

The objective of this master’s thesis is to validate the hypothesis put forward by Sandvik Coromant. To understand attrition wear, a laboratory tribological test was designed using a pin-on-disc confguration to specifcally induce attrition wear to the PCD inserts. Sandvik Coromant supplied both worn and unworn PCD inserts for this study. The worn inserts were analysed with respect to their dominant wear mechanisms after being subjected to severe machining tests in the company, while the unworn inserts were used for the pin-on-disc test campaign.

After analysing the tribological test results and characterising the inserts using various techniques, such as light optical microscopy (LOM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and three-dimensional proflometry, it was observed both test methods exhibited the same two types of wear phenomena. The frst phenomenon, known as micro-wear, was identifed by the presence of scratches on the rake surface, resulting from the detachment of diamond micro-fragments from cracks within the diamond grains. The second phenomenon, called macro-wear, was characterised by the presence of grooves caused by the detachment of diamond grains from the insert edges. Same wear behaviour patterns were observed in both test methods, indicating that the identical wear mechanisms were present. Thus, validating the hypothesis put forward by Sandvik Coromant.

Place, publisher, year, edition, pages
2023. , p. 51
Keywords [en]
Polycrystalline diamond inserts (PCD), Aluminium machining, Pin-on-disc, Attrition wear, Tribology
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:ltu:diva-99154OAI: oai:DiVA.org:ltu-99154DiVA, id: diva2:1780161
External cooperation
Sandvik Coromant
Educational program
Materials Engineering, master's level
Supervisors
Examiners
Available from: 2023-08-14 Created: 2023-07-05 Last updated: 2023-08-14Bibliographically approved

Open Access in DiVA

No full text in DiVA

By organisation
Department of Engineering Sciences and Mathematics
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)Manufacturing, Surface and Joining Technology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 104 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf