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US 9,180,532 B2Granted
Multi-piece twist drill head and twist drill including the same
AssigneeKennametal Inc.
InventorsX. Daniel Fang, Jean-Luc Dufour, David J. Wills
Life of this patent
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Abstract
One non-limiting aspect of the present disclosure is directed to a multi-piece twist drill head. The multi-piece twist drill head includes a core piece formed from a first hard material, and a peripheral piece formed from a second hard material. The core piece and peripheral piece each comprise a cutting edge and are adapted to mate to provide a central region and a peripheral region, respectively, of the multi-piece twist drill head. A twist drill including the multi-piece twist drill head is also disclosed.
Claims19
A multi-piece twist drill head comprising:
- a core piece formed from a first hard material and comprising a cutting edge;
- a peripheral piece formed from a second hard material and comprising a cutting edge and at least one helical flute;
- wherein the core piece and peripheral piece are adapted to mate to provide a central region and a peripheral region, respectively, of the multi-piece twist drill head;
- wherein the peripheral piece comprises a cavity and the core piece is disposed in the cavity;
- wherein the cutting edge of the core piece is aligned to abut with the cutting edge of the peripheral piece when the peripheral piece is mated with the core piece to form a continuous cutting edge;
- and
- wherein the core piece and peripheral piece are each configured to be removed from the twist drill head and replaced.
4 more elements
A twist drill comprising:
- a body portion including a first end and a second end, the body portion including a helical flute on a periphery thereof;
- an attachment portion at the first end of the body portion, wherein the attachment portion is adapted to connect the multi-piece twist drill to machine tool;
- and
- a multi-piece twist drill head adapted to attach to the second end of the body portion and including
- a core piece formed from a first hard material, and
- a peripheral piece formed from a second hard material and comprising a cutting edge and at least one helical flute,
- wherein the core piece and peripheral piece are adapted to mate to provide a central region and a peripheral region, respectively, of the multi-piece twist drill head;
- wherein the peripheral piece comprises a cavity and the core piece is disposed in the cavity;
- and
- wherein the cutting edge of the core piece is aligned to abut with the cutting edge of the peripheral piece when the peripheral piece is mated with the core piece to form a continuous cutting edge.
7 more elements
Dependencies are inferred from the claim text.