Interference fit type cutting tool

摘要

In an interference fit type cutting tool according to the present invention, a head section (12) and a shank (11) section are fitted together by shrinkage fitting. The shank section (11) is provided with a shaft portion (16) and a taper portion (18). The head section (12) is provided with a hole portion (26) to be fitted on the shaft portion (16), and a tapered portion (18) to be fitted on the taper portion (28). The hole portion (26) and the tapered portion (28) have an interference, and the inner diameters thereof are smaller than the outer diameters of the shaft portion and the taper portion. Two-surface restraint is established by fixing the shaft portion (16) and the hole portion (26), and the taper portion (18) and the tapered portion (28) with the interference pressure by shrinkage fitting. A key (17) is formed on the leading end face (15) of the shaft portion (16), a key groove (27) is formed in the bottom face (26b) of the hole portion, and the key (17) and the key groove (27) are fitted together. Side faces of the key and the key groove are nearly orthogonal to the principal force of cutting resistance, thereby enhancing dynamic stiffness.