Metal tools and implements – making – Blank or process – Drill
Patent
1991-09-11
1993-03-23
Howell, Daniel W.
Metal tools and implements, making
Blank or process
Drill
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.
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New Thoughts on Machinery for Synthetic Polycrystalline Diamond Die Piercing and Profiling.
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James David W.
Notter Theo A.
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