ROTARY CUTTING TOOL INCLUDING POLYCRYSTALLINE DIAMOND MATERIAL

摘要

This rotating cutting tool having a polycrystalline diamond sintered body has: a PCD layer, comprising a PCD sintered body, integrally sintered with a starting material and arranged on a wall surface facing the tool rotation direction of a chip discharge groove formed at the tip of the tool main body having an ultra-hard alloy as the starting material therefor, said tool main body being rotated around an axis; a cutting blade having this wall surface as the rake face thereof formed upon the PCD layer; and a margin formed in the tip outer circumference of the tool main body and extending to the rear of the chip discharge groove in the tool rotation direction. The cutting blade is formed on the side ridges of the rake face on the tip side of the tool main body and the thickness of the PCD layer as viewed from the tool main body tip side in the axial direction is 1/3-1 times the thickness of the margin.