Drill and insert for drill having improved centering capability and cutting performance

Abstract

Disclosed are a drill and an insert for a drill having improved centering capability and cutting performance. A drill of the present invention processes a relief surface in the center of a cutting edge portion into a flat surface and processes a relief surface on the outer circumferential portion which is connected from the center to the outer circumferential surface into a curved surface, thereby enhancing centering capability and minimizing generation of drill vibration and burr. In addition, the drill of the present invention identically processes the tangential angle of a relief surface, which comes into contact with a hole, regardless of the outer diameter size of the drill, thereby achieving uniform performance even if the outer diameter of the drill varies.

Description

technical field [0001] The present invention relates to a drill or an insert for a drill that achieves a plane relief at the center, makes the point angle constant, thereby improving the centering ability, and treats the relief surface at the outer periphery as a curved surface , Solve the problems caused by sharp changes in point angles, thereby minimizing the occurrence of drill vibration and burrs. Background technique [0002] As a rotary tool such as an end mill (End Mill), a drill is processed along a central axis as a rotation axis with a cutting tooth (Cutting Tooth) at the front and a rear end extending from the cutting tooth A tool formed with a shank. [0003] Drills are divided into solid type drills which are integrated and indexable type drills which are used by inserting inserts at the drilling point. The solid drill is a drill that cannot be used if the cutting edge portion at the front end is completely worn out, and the entire drill needs to be replaced. ...

AI Technical Summary

Problems solved by technology

[0014] The object of the present invention is to provide a drill or an insert for a drill that achieves a plane relief at the center, makes the point angle constant, thereby improving the centering capability, and treats the relief surface at the outer periphery as a curved surface. , to solve the problem caused by the sharp change of the point angle, so as to minimize the vibration of the drill bit and the occurrence of burrs (Bur)

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