Rotary cutting tool and process for making same

Cutting by use of rotating axially moving tool – Tool having crystalline cutting edge

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408230, B23C 5102

Patent

active

046799710

ABSTRACT:
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.

REFERENCES:
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patent: 1887372 (1932-11-01), Emmons
patent: 2858718 (1958-11-01), Kohler
patent: 2978846 (1961-04-01), Barron
patent: 3017790 (1962-01-01), Werle
patent: 3085453 (1963-04-01), Mossberg
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German Utility Model Application dated 12 May 1966, Inventor Erwin Stuber.
Switzerland: Technica 1969, No. 9, p. 810.
Switzerland: Technica 1962, No. 19, pp. 1405-1409.

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