| 摘要 |
An object of the invention is to provide a drill which improves the aligning accuracy of an insert with respect to a drill main body, and which achieves a stable machining operation while maintaining the strength of the drill main body. To achieve the object, the drill includes a drill main body being rotatable about an axis, and a throwaway insert detachably attached to the drill main body, wherein the drill main body includes a concave groove which opens at a distal end face thereof, the concave groove includes guiding grooves extending in the direction of the axis on an inner surface thereof, the throwaway insert includes convex portions on an outer surface thereof that are engageable with the guiding grooves, and the concave groove is formed so as to accommodate the throwaway insert. The throwaway insert is attached to the drill main body by being inserted into the concave groove in a direction from the distal end face to the concave groove while engaging the convex portions with the guiding grooves. <IMAGE> |
