| 摘要 |
PURPOSE: A drill tool is provided to easily perform a drilling process by shortening processing time and to improve the safety of the drilling process by finely forming chips generated from an object to be cut. CONSTITUTION: A drill tool(100) has a rear end having a fixing surface(115) and a front end having a cutting blade(120). A diameter of the rear end is larger than a diameter of the front end. A chip discharging slot(111) is formed in the cutting blade(120) for discharging chips. A cutting oil inlet(113) is formed in the cutting blade(120) so as to reduce frictional heat generated when cutting an object. A cutting blade resting hole(112) is formed in a body(110) of the drill tool(100) so as to fix the cutting blade(120) thereto. An end of the chip discharging slot(111) is formed at one side of the cutting blade resting hole(112). A screw hole is formed at the other side of the cutting blade resting hole(112).
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