Method of manufacturing of cutting tool

A method of manufacturing cutting tools, comprising:

• preparing a circular body of a cutting tool having a plurality of installation portions, each installation portion having an inclined surface at an outer periphery thereof extending substantially across thickness of the body;
• preparing a plurality of interposed members, each interposed member including a plate portion having a circumferential upper surface, longitudinal ends, and a plurality of projections extending upwardly from the plate portion, said projections being arranged on the circumferential upper surface, along the longitudinal direction of the plate portion and spaced apart from each other, two of said projections located adjacent to the respective longitudinal ends of the plate portion being spaced from the respective longitudinal ends of the plate portion so that any portions of the projections are not coplanar with the longitudinal ends of the plate portion and are located completely away therefrom, thickness or height of the interposed member being between 2.5-4.0 mm and height of the projection being between 0.8-1.2 mm;
• preparing a mold having a space so that width thereof is substantially the same as width of the interposed member, said mold including first and second molding members slidably situated inside the space;
• disposing the interposed member in the space of the mold;
• disposing metal powder with diamond dust in the space of the mold so that at least the space adjacent the projections is completely filled with the metal powder with the diamond dust;
• heating the metal powder with diamond dust by applying electricity between the first and second molding members and pressurizing the metal powder toward the interposed member by applying pressure against the first and second molding members so that a cutting segment is formed by the metal with diamond dust and is firmly fixed onto the interposed member to completely cover the projections to thereby prevent possibility of cracks occurring on the cutting segment;
• disposing the interposed members with the cutting segments adjacent the inclined surfaces of the installation portions along the radial direction of the circular body;
• and
• welding the interposed members with the cutting segments onto the inclined surfaces of the body of the cutting tool so that the interposed members are welded to the body from a side of the body of the cutting tool with the inclined surface.