liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • 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
PCBN hard turning of ball bearing steel: Influence of PVD coating deposition on tool wear and surface finish / surface integrity of machined surface
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology. Dalarna University, Falun, Sweden.
Seco Tools AB, Fagersta, Sweden.
Dalarna University, Falun, Sweden.
Dalarna University, Falun, Sweden.
2013 (English)Manuscript (preprint) (Other academic)
Abstract [en]

The wear characteristics of a uncoated and PVD coated low cBN content PCBN cutting tools during hard turning of hardened ball bearing steel have been evaluated. Post-cutting examination of the worn cutting inserts were performed using high resolution field emission gun scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Auger electron spectroscopy (AES) and optical surface profilometry. Also, the machined work material surfaces were characterized in order to evaluate the influence of tool wear on surface finish / surface integrity of machined surface.

The PCBN cutting tools evaluated in the present study all display crater wear, flank wear and edge micro chipping. With respect to the observed scatter in the results the influence of PVD coating on crater and flank wear resistance is very small. Besides a gradual wear mainly caused by adhesive and abrasive wear the PVD coatings show a high tendency to spalling. Flank and crater wear of the PCBN material was found to be controlled by both mechanical and tribochemical mechanisms. SEM and EDS analysis of the crater and flank wear regions showed that the worn PCBN surfaces were covered with patches of adhered work material consisting of mainly iron oxide. AES analysis support these results.

The machined surfaces show a smooth surface with a Ra-value in the range of 100-200 nm and with a superficial plastic deformation limited to the extreme surface. However, with increasing crater and flank wear in combination with edge chipping the machined surface topography becomes more rough showing Ra-values in the range of 300-400 nm.

Place, publisher, year, edition, pages
2013.
Keyword [en]
Hard turning, PCBN, PVD coating, Tool wear, Wear mechanisms
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-102546OAI: oai:DiVA.org:liu-102546DiVA: diva2:678964
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2013-12-13Bibliographically approved
In thesis
1. Wear of coated and uncoated PCBN cutting tool used in turning and milling
Open this publication in new window or tab >>Wear of coated and uncoated PCBN cutting tool used in turning and milling
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This licentiate thesis has the main focus on evaluation of the wear of coated and uncoated polycrystalline cubic boron nitride cutting tool used in cutting operations against hardened steel. And to exam the surface finish and integrity of the work material used. Harder work material, higher cutting speed and cost reductions result in the development of harder and more wear resistance cutting tools. Although PCBN cutting tools have been used in over 30 years, little work have been done on PVD coated PCBN cutting tools. Therefore hard turning and hard milling experiments with PVD coated and uncoated cutting tools have been performed and evaluated. The coatings used in the present study are TiSiN and TiAlN. The wear scar and surface integrity have been examined with help of several different characterization techniques, for example scanning electron microscopy and Auger electron spectroscopy.

 

The results showed that the PCBN cutting tools used displayed crater wear, flank wear and edge micro chipping. While the influence of the coating on the crater and flank wear was very small and the coating showed a high tendency to spalling. Scratch testing of coated PCBN showed that, the TiAlN coating resulted in major adhesive fractures. This displays the importance of understanding the effect of different types of lapping/grinding processes in the pre-treatment of hard and super hard substrate materials and the amount and type of damage that they can create. For the cutting tools used in turning, patches of a adhered layer, mainly consisting of FexOy were shown at both the crater and flank. And for the cutting tools used in milling a tribofilm consisting of SixOy covered the crater. A combination of tribochemical reactions, adhesive wear and mild abrasive wear is believed to control the flank and crater wear of the PCBN cutting tools. On a microscopic scale the difference phases of the PCBN cutting tool used in turning showed different wear characteristics. The machined surface of the work material showed a smooth surface with a Ra-value in the range of 100-200 nm for the turned surface and 100-150 nm for the milled surface. With increasing crater and flank wear in combination with edge chipping the machined surface becomes rougher and showed a higher Ra-value. For the cutting tools used in milling the tendency to micro edge chipping was significant higher when milling the tools steels showing a higher hard phase content and a lower heat conductivity resulting in higher mechanical and thermal stresses at the cutting edge.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 39 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1634
Keyword
PCBN, PVD coating, Wear mechanisms, Tool wear, Metal cutting
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-102551 (URN)10.3384/lic.diva-102551 (DOI)LIU-TEK-LIC-2013:68 (Local ID)978-91-7519-443-1 (ISBN)LIU-TEK-LIC-2013:68 (Archive number)LIU-TEK-LIC-2013:68 (OAI)
Presentation
2014-01-17, Högskolan i Dalarna, Borlänge, 13:15 (Swedish)
Opponent
Supervisors
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2015-06-01Bibliographically approved

Open Access in DiVA

No full text

Authority records BETA

Sveen, Susanne

Search in DiVA

By author/editor
Sveen, Susanne
By organisation
Department of Physics, Chemistry and BiologyThe Institute of Technology
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 165 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • 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