HARD MILLING OPERATION OF AISI O2 COLD WORK TOOL STEEL BY CARBIDE TOOLS PROTECTED WITH DIFFERENT HARD COATINGS


Çalışkan H., KURBANOĞLU C. , Davorin K., Panjan P., Kopac J.

JESTECH, vol.15, no.1, pp.21-26, 2012 (Journal Indexed in SCI)

  • Publication Type: Article / Article
  • Volume: 15 Issue: 1
  • Publication Date: 2012
  • Title of Journal : JESTECH
  • Page Numbers: pp.21-26

Abstract

Abstract Milling of hard materials is an important operation in tool production. With the hard milling operations, a decrease in the production time and in the cost of products can be obtained by the elimination of some process steps and coolants. However, unpredictable tool life and premature failure of cemented carbide tools are major process restrictions in hard milling due to the higher cutting forces and temperatures compared to conventional machining. One of the methods used for tool life enhancement is the protection of the tools by hard coatings, therefore a selection of the cutting tool giving the longest lifetime is needed. In this study, the cutting performance tests were performed on AISI O2 (90MnCrV8) cold work tool steel (58 HRC) in order to determine the best cutting tool giving the longest tool life. Four types of tool were used during the tests for lifetime comparison, i.e. uncoated, nanolayer AlTiN/TiN, multilayer nanocomposite TiAlSiN/TiSiN/TiAlN and commercially available TiN/TiAlN coated tool. Wear mechanisms and chip formation were analyzed by optical microscope, SEM and EDS. The most suitable cutting tool for hard milling of AISI O2 cold work tool steel was determined as nanolayer AlTiN/TiN coated carbide tool.