| 摘要 |
PROBLEM TO BE SOLVED: To prolong the service life of a tool by increasing wear resistance in the vicinity of the rotational center of a super hard alloy as a base body for a throwaway tip used for a ball end mill and the plastic deformation resistance of an outer peripheral part. SOLUTION: In a throwaway tip used for a throwaway ball end mill coated with hard film, a Co content in a super hard alloy is >=3 wt. % and <=10 wt.%, a WC average particle size is >=0.3 micron and <=1.2 micron, and a Co grating constant is >=3.565Åand <=3.575Å.
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