ホブコーティング膜の耐摩耗性に関する基礎研究（一本刃舞いツールによる断続切削試験）

概要

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The wear resistance of coating films on hob cutting teeth is investigated by intermittent cutting 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 resistance of coating films is shown with regard to film thickness, film materials, ingredient ratio in a film component and the effect of the oxidization on coating films. The oxidization is clarified through the influence on the crater wear propagation through wear cutting tests in atmosphere such as nitrogen gas or oxygen gas. The oxidization of TiAlN coating films produces oxidation 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, while it has a reverse effect in nitrogen gases, though. The AlCrSiN film has effective resistance against the wear such as abrasive wear and/or oxidization wear. The oxidation film formed on the AlCrSiN film is very firm and this suppresses the oxidations wear on the rake face and works against the abrasive wear advantageously.