| 摘要 |
PROBLEM TO BE SOLVED: To provide a coated drill having excellent tool life by improving its wear resistance through increasing the hardness of a Cr-based coating film which is a week point of the Cr-based coating film. SOLUTION: The coated drill has a hard coating film coated by the arc discharging type ion plating method. The hard coating film is represented by the following formula, (Al<SB>x</SB>Cr<SB>1-x-y</SB>Si<SB>y</SB>)(N<SB>1-α-β-γ</SB>B<SB>α</SB>C<SB>β</SB>O<SB>γ</SB>), where x, y,α,β, andγshow the following atomic ratios respectively, 0.45<x<0.75, 0≤y<0.2, 0≤α<0.12, 0≤β<0.2, and 0<γ≤0.25. The value of the diffraction intensity I(200)/I(111) is at least 0.5 and at most 6. The binding energy of at least Cr, Al and/or Si with oxygen is within the range from 525 eV to 535 eV in the X-ray photoelectron spectroscopic analysis. The base body of the drill is made of a high speed steel having the following composition, 3≤(V+Co)≤11, 3.8≤Cr≤4.5. COPYRIGHT: (C)2005,JPO&NCIPI
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