CBN CUTTING TOOL MANUFACTURING METHOD AND CBN CUTTING TOOL

摘要

Provided are: a method for manufacturing a cubic boron nitride cutting tool including a base metal and a sintered cubic boron nitride compact at a corner portion of the base metal, the method being capable of improving the accuracy of the center height to a large extent and sufficiently reducing the angle of inclination or the width of a negative rake face; and the cubic boron nitride cutting tool. The method includes grinding the sintered cubic boron nitride compact by pressing the sintered cubic boron nitride compact against an end face of a grindstone of a grinder, whose position and orientation are controllable, to form a flank face and a rake face on the sintered cubic boron nitride compact while the base metal of the cubic boron nitride cutting tool is tightly held by a chuck of the grinder. The grinding is performed in such a manner that the sintered cubic boron nitride compact is substantially ground. In the grinding to form the rake face, the rake face is formed so as to be recessed from a top face of the base metal or only a portion of the sintered cubic boron nitride compact that protrudes from a base-metal rake face is ground while the tool is continuously held by the chuck.