Drill
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United States of America Patent
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N/A
Issued Date -
Jul 30, 2009
app pub date -
Apr 4, 2005
filing date -
Apr 4, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A drill is designed to ensure wear resistance to achieve extended tool life. In the drill, at least the surface of the cutting edge is coated with a hard compound, and the film thickness dimension of the hard compound is set to be within the range of 0.1 μm or more and 1.0 μm or less. Further, the thickness dimension of the web thickness formed by the web of the groove portion is set to be within the range of 0.15 D or more and 0.25 D or less relative to the outer diameter D of the cutting edge. Consequently, chip dischargeability can be synergistically improved. As a result, there is an effect in that it is possible to prevent chip welding to thereby synergistically improve the life of the drill.
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