This paper contains the results of a tool wear study conducted to compare the performance of 3 similar milling inserts used on a Superclean NiCrMoV steel. The coating type and chip breaker groove angle differed between inserts, and sample material was milled in straight passes until failure was reached at 300 μm of flank wear. The different insert types showed very different wear rates, where the longest tool life was exhibited by an insert with a multi-layer PVD coating and comparatively more aggressive chip breaker groove angle. CVD coatings were found to be un-suitable due to increased tendency of chipping due to highly interrupted cutting.
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