Cutting insert for indexable drill

The present invention relates to a cutting insert for an indexable drill. A cutting insert for an indexable drill according to the present invention can be used for external cutting or internal cutting depending on the installed position and direction thereof, even when provided as a single type of insert. Also, the cutting insert for an indexable drill according to the present invention has regions, in the internal cutting edges, that are involved in a cutting process and those that are not involved in a cutting process which are clearly distinguished from each other, thus the cutting insert can be rotated and mounted and flipped and mounted on a drill body. Thus, up to eight corners can be used in a cutting process. 本发明涉及可转位钻头用切削刀片。本发明的可转位钻头用切削刀片即使以单种类提供，也可以根据安装的位置和方向而用作外刃切削用、内刃切削用。另外，就本发明的可转位钻头用切削刀片而言，在内刃切刃中参与切削加工的区间和不参与切削加工的区间明确区分，从而使得能够把切削刀片反转加装或倒转加装于钻头主体，能够最大利用8角执行切削加工。