Multi-piece twist drill head and twist drill including the same

摘要

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.

主权项

1. A multi-piece twist drill head comprising:
a core piece formed from a first hard material and comprising a cutting edge; 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; wherein the core piece and the peripheral piece are adapted to be mated by permanent mechanical joining comprising at least one of soldering, welding, brazing, hydraulic press fitting, and adhering and wherein the core piece and peripheral piece are each configured to be removed from the twist drill head and replaced.