| 摘要 |
PURPOSE: An insert drill is provided to enlarge life by forming cutting oil holes at both sides of a drill blade and cutting oil channels communicating with the cutting oil holes to supply cutting oil to the drill blade smoothly. CONSTITUTION: An insert drill includes cutting oil channels(11D) formed from an upper end to a lower portion of a drill blade part(11), and a cutting oil flow hole(11e) formed in an insertion part(11f) of a lower end of the drill blade part and communicating with the cutting oil channels. A cutting oil discharge hole(11d) is formed from the upper end to a lower end of the drill blade part and communicates with the cutting oil flow hole. A cutting oil discharge hole(11d') is formed in a side wall from the upper end to the lower end of the drill blade part and communicates with the cutting oil flow hole of the insertion part.
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