Drill
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United States of America Patent
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N/A
Issued Date -
Oct 30, 2008
app pub date -
Jul 20, 2005
filing date -
Jul 20, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A drill can achieve extended tool life while ensuring high machining efficiency. A flute length of the drill is set to be within a range of 6D or more and 10D or less relative to an outer diameter D of the cutting edge. At least the cutting edge has its surface coated with a hard compound and the film thickness dimension of the hard compound is set to 1.0 .mu.m or less, and the number of cutting edges is set to two. As a result, chip dischargeability and rigidity of the drill can be synergistically improved. Therefore, the life of the drill can be synergistically improved.
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