Patent ID: 8678723

Claim:
A throw-away rotating tool comprising: a body having a plurality of standing portions that erect around an axial core thereof at intervals; and a throw-away tip made of a material harder than the body and having a convex connection projected on a rear end thereof, in which the convex connection is inserted into the inside of the standing portions, and relatively rotated about the axial core to connect the convex connection and the standing portions, wherein each of the standing portions has an inner peripheral groove orthogonal to the axial core and recessed in an inner peripheral wall thereof, wherein the convex connection has a protrusion configured to be projected from an outer peripheral wall thereof and detachably fitted into the inner peripheral groove, and formed with a sliding contact portion of the inner peripheral groove which contacts with a wall of a leading end side of the body, wherein the protrusion has a first tilt portion continuous to a rear side of rotation of the sliding contact portion of the throw-away tip that is relatively rotated, wherein the first tilt portion is tilted downward from the sliding contact portion toward a rear end side of the throw-away tip, wherein the protrusion has a second tilt portion continuous to a front side of rotation of the throw-away tip that is relatively rotated, and wherein the second tilt portion is tilted downward from the sliding contact portion toward a rear end side of the throw-away tip.