DRILLING TOOL AND DRILLING METHOD FOR FIBER-REINFORCED COMPOSITE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a drilling tool capable of drilling a high-grade hole with reduced burrs and fuzz in a fiber-reinforced composite material represented by FRP (Fiber Reinforced Plastic) and maintaining excellent hole drilling quality for a long period of time by extending a tool service life, while suppressing an increase in economic burden.;SOLUTION: This drilling tool is formed based on a twist drill, and has cutting edges 4 which are formed at a tip of a main body 2 from a rotation center to an outer periphery, and symmetric around the rotation center. Each of the cutting edges 4 is constituted of at least three parts of a rotation center edge 4a, an intermediate edge 4b and an outermost peripheral edge 4c. The cutting edge has a structure in which the outermost peripheral edge 4c is formed into a linear shape and a tip angle of each edge is stepwise reduced from the rotation center side to the edge on an outer peripheral side.;COPYRIGHT: (C)2009,JPO&INPIT