Patent ID: 11858053
Assignee: KENNAMETAL INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 6:
7. A twist drill for the rotary machining of workpieces comprising:
a cutting tip having at least one main cutting edge and at least one free surface, wherein a flank face adjoins the main cutting edge radially outside the main cutting edge and a portion of the flank face is located on a peripheral surface of the twist drill, wherein the at least one main cutting edge merges into an edge of the flank face, and wherein a flank angle of the flank face, measured in a section perpendicular to the main cutting edge, continuously increases in a radially outward direction from the at least one main cutting edge to a cutting corner to increase a clearance of the twist drill during a machining operation, thereby reducing wear on the twist drill.