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US 5,310,293 AGranted
Drill bit with cutting insert
OwnerTheo A. Notter, David W. Jamesinventors
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OwnerTheo A. Notter, David W. Jamesinventors
Estimating the term…
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.
A cutting insert for use with a twist drill of the type having a drill body including a face, a flank, and a seat formed in the flank, the seat defining a support surface to support the cutting insert, and the support surface being inclined at a predetermined angle to the face of the drill,
A twist drill comprising:
A twist drill (24) comprising cutting inserts bonded into seats (30) formed in the flanks of the drill, each cutting insert comprising first and second adjacent facets which intersect at a predetermined first angle, the first facet providing a cutting edge at its intersection with the face of the drill, the first facet being flush with the flank of the twist drill and the second facet comprising a seating surface bonded to a support surface (32) defined by said seat (30) characterized in that the cutting insert has a prismatic shape and comprises a layer (16) of abrasive compact bonded to a cemented carbide backing (18), the first facet (20) having thereon the cutting edge formed of the abrasive compact layer and the second facet seating surface being formed predominantly of the cemented carbide backing, in that the second facet is at an inclined angle relative to the first facet, and in that the slots provided in the flanks of the twist drill (24) meet in the region of the chisel edge of the drill, and the inserts in the respective slots have adjacent portions which form the chisel edge of the drill.
Dependencies are inferred from the claim text.