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
Estimating the term…
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.
Claims22
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;
- and
- wherein the cutting edge of the core piece is aligned with the cutting edge of the peripheral piece when the peripheral piece is mated with the core piece to form a continuous cutting edge.
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 with the cutting edge of the peripheral piece when the peripheral piece is mated with the core piece to form a continuous cutting edge.
A multi-piece twist drill head comprising:
- a core piece formed from a first hard material and comprising a cutting edge;
- piece formed from a second hard material and comprising a cavity and a cutting edge;
- wherein the core piece is disposed in the cavity of the peripheral piece to provide a central region and peripheral region of the multi-piece twist drill head and wherein the cutting edge of the core piece is aligned with the cutting edge of the peripheral piece to form a continuous cutting edge.
The multi-piece twist drill head of claim 22, wherein the peripheral piece encircles the core piece.
Dependencies are inferred from the claim text.