ROTATIONS-SCHNEIDWERKZEUG UND VERFAHREN ZU SEINER HERSTELLUNG

摘要

A rotary cutting tool, e.g. a drill bit, has a generally cylindrical working head consisting of ultrahard incisive material such as cubic polycrystalline diamond or boron nitride. The working head has at least peripheral cutting edges which may extend onto an adjoining carrier of hard metal secured thereto along a transverse interface; the carrier may be bonded at another junction to a tool body or may itself constitute such a body. Also disclosed is a method of making such a tool, particularly a drill with a working head of 5 mm or less, according to which a prefabricated block, consisting of interconnected ultrahard and metallic blanks for the head and its carrier, is soldered inside an aligning sleeve onto a cylindrical extension of the tool body whereupon the extension and the block are jointly machined to form the tool.