Main body of tip exchange type cutting tool and tip exchange type cutting tool

摘要

The body part (3) of the tip exchange type cutting tool (1) is made of a first metal material, and has a cylindrical cylinder part (32) extending in the axial direction, and an inner periphery of the cylinder part (32) ( 40) provided with a male screw part (24) of the cutting head (2) and a female screw part (33) which can be screwed together. The female thread portion (33) includes a first female thread portion (34) and a second female thread portion (35). The first female thread portion (34) is closer to the female thread peak (37) side than the female thread root (36) of the female thread portion (35), and the female thread root than the portion corresponding to the effective diameter of the female thread portion (33). It is a part from the part on the (36) side to the female thread peak (37) of the female thread part (33). The first female thread portion (34) is made of a second metal material different from the first metal material. The second female screw portion (35) is a portion that is continuous with the inner periphery (40) of the cylindrical portion (32) and is a portion other than the first female screw portion (34) of the female screw portion (33). The second female thread portion (35) is made of a first metal material.