(57) [Abstract] [Configuration] on the chip mounting seat 22 formed on the outer peripheral surface of the disk-shaped cutter body 21, a plate-shaped cutting insert 23, along the thickness direction in the radial direction of the cutter body 21 As such, it will be mounted by the clamp screw 36. Also, the throw-away tip 23 is disposed on the one end face 32 side of the reference end face of the outer peripheral surface of the cutter body 21, the cutting edge 30 is assigned a positive axial rake angle θ 1 with respect to the reference end surface and the throw-away tip 23A was, from this reference end surface and is located in the other end face 33 side of the opposite side, a throw-away tip 23B that cutting edge 30 is attached a negative axial rake angle θ 2 with respect to the reference end surface is constructed and mounted these throw-away tip 23A, and 23B alternately in the circumferential direction of the cutter body 21. EFFECT improving the cutting efficiency and cutting accuracy, the extension of the tip life is attained, and it is possible to suppress the occurrence of burrs.
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