Drill bit with cutting insert

Metal tools and implements – making – Blank or process – Drill

Patent

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Details

761011, 407118, 408144, 408145, B23P 1532

Patent

active

051954044

ABSTRACT:
The invention provides a method of manufacturing a twist drill having a cutting insert. The method includes the steps of providing a cutting insert which has a prismatic shape and which comprises a layer of abrasive compact which is bonded to a cemented carbide backing. The insert has on a first facet a cutting edge formed by the abrasive compact layer, and on a second facet a seating surface formed predominantly by the cemented carbide backing. The first and second facets define a predetermined first angle with each other. A twist drill is provided, having a seat in its flank. The seat defines a support surface adapted to receive a seating surface of the insert, and is inclined at a predetermined second angle to the face of the drill. The insert is bonded into the seat, so that the cutting edge of the insert defines the major cutting edge of the drill and the first facet of the insert coincides with the face of the drill. The invention includes cutting inserts and twist drills produced by the method.

REFERENCES:
patent: 1977845 (1934-10-01), Emmons
patent: 4109737 (1978-08-01), Bovenkerk
patent: 4252102 (1981-02-01), Phaal et al.
patent: 4481016 (1984-11-01), Campbell et al.
patent: 4527643 (1985-07-01), Horton et al.
patent: 4604106 (1986-08-01), Hall et al.
patent: 4671710 (1987-06-01), Aoki
patent: 4714385 (1987-12-01), Komanduri
patent: 4849602 (1989-07-01), Gardner
New Thoughts on Machinery for Synthetic Polycrystalline Diamond Die Piercing and Profiling.
Machining of Diamonds by High Energy-Density Sources, by C. van Osenbruggen and T. Botden.
High Speed Spark Machining, Dyne, Apr. 1984.
Spark Erosion of Diamond, The Review of Scientific Instruments.

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