Wear resistance of coating films on hob teeth (Intermittent cutting tests with a flytool)

Yoji Umezaki, Yoshiyuki Funaki, Syuhei Kurokawa, Osamu Ohnishi, Toshiro Doi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The wear resistance of coating films on hob teeth is investigated through the simulated hobbing tests with a flytool. The coating films on hob teeth are titanium family ceramics such as TiN, TiCN, TiSiN and TiAlN and aluminum chromium family ceramics such as AlCrN and AlCrSiN. The wear of coated tools is shown about film thickness, film materials, ingredient ratio in a film component and the oxidization of coating films. The oxidization is clarified from a result of the influence on the crater wear progress through wear cutting tests in atmosphere of nitrogen gas or oxygen gas. The oxidization of TiAlN coating films produces oxide products on the tool rake face, and this oxidation relates to the amount of crater wear. The increase of aluminum concentration in the TiAlN film improves the crater wear resistance in air atmosphere, while it has a reverse effect in nitrogen gases. The AlCrSiN film has effective wear resistance against the abrasive wear and/or oxidization wear. The oxidation film formed on the AlCrSiN film is very firm and this suppresses the oxidation wear on the rake face and works against the abrasive wear advantageously.

Original languageEnglish
Pages (from-to)206-221
Number of pages16
JournalJournal of Advanced Mechanical Design, Systems and Manufacturing
Issue number2
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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