Tip portion of the drill bit

Details Tip portion of the drill bit Tip portion of the drill bit

1997-08-07

2000-03-14

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408227, B23B 5102

Patent

active

060364106

ABSTRACT:
The present invention pertains to a drill bit tip portion (3) comprising a drill bit body having an axis of symmetry (1). The drill bit body having lands (2) symmetrically displaced around the symmetry axis (1) has axial clearance faces (6) forming main cutting edges (5) and back edges (7). The main cutting edges (5) are connected with axial rake faces (4). The axial clearance faces (6) are crossed beginning from the axial rake faces (4) throughout the back edges (7) till the drill apex (9) by the oval cross section grooves (10) forming symmetrically central cutting edges (11). The central cutting edges (11), being connected to one another at a drill apex (9), are connected to corresponding main cutting edges (5). The corresponding surfaces of the grooves (10) are smoothly connected with the axial rake faces (4), and the central cutting edges (11) are smoothly connected with the corresponding main cutting edges. Therefore a rake angle is conserved from a vicinity of those connections till the drill bit apex (9) at the condition of the groove cross section invariability. In this manner, the central cutting edges (11) are an extension of the lips (5) to the drill apex.

REFERENCES:
patent: 1467491 (1923-09-01), Oliver
patent: 4222690 (1980-09-01), Hosoi
patent: 5590987 (1997-01-01), Bouzounie

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