ドリル

[PROBLEMS] To prevent a work material from being lifted by a drill, to suppress damage to the work material and the occurrence of delamination, to be excellent in chip discharge efficiency of the drill, and to prevent clogging. provide a drill. A drill A has a shank part 2, and a core cutting edge 121, a body cutting edge 122, and a diameter substantially equal to the maximum diameter of the cutting edge 122 which are provided at the tip of the shank part 2 and which process a material to be processed in a rotating direction. A finishing blade 123 provided parallel to the direction of the rotation axis, flanks 126a, 126b, and 126c connected to the cutting edge of each blade in the direction of rotation, and connected in the direction opposite to the direction of rotation, so as to substantially follow the diameter line of itself, A drill bit 1 having a concave scooping surface 120 provided so as to overlap the rotation center axis. [Selection diagram] Fig. 1【課題】ドリルによる被加工材料の持ち上がりが起こることを防止し、被加工材料の損傷やデラミネーションの発生を抑制すると共に、ドリルでの切り屑の排出効率に優れ、詰まりを防止することができるドリルを提供する。【解決手段】ドリルAは、シャンク部2と、シャンク部2の先端に設けられると共に、回転方向において被加工材料を加工する心刃121、胴刃122、胴刃122の*大径と略同径で回転軸方向と平行に設けられた仕上げ刃123、各刃の刃先に回転方向へつながる逃げ面126a、126b、126c、及び回転方向と逆方向へつながり、自身の直径線に略沿うように、回転中心軸と重なって設けられている凹面状の掬い面120を有するドリル刃1とを備える。【選択図】 図1