Drill and indexable carbide insert therefor

Details Drill and indexable carbide insert therefor Drill and indexable carbide insert therefor

B - Operations, Transporting

23

B

77/33

B23B 51/00 (2006.01)

Patent

CA 1207566

TITLE OF THE INVENTION A DRILL AND INDEXABLE CARBIDE INSERT THEREFOR ABSTRACT OF THE DISCLOSURE Disclosed is a drill with a shank having a central axis of rotation and only one insert on one end of the shank. The insert has two cutting edges. The first cutting edge has a negative radial rake and the second cutting edge has negative axial and positive radial rake surface. The first and second cutting edges cooperate to form a radiused hole when rotated about the central axis. Also disclosed is a cutting insert of hard wear resistant material. The insert has top and bottom faces and a peripheral wall joining the top and bottom faces. The insert body is polygonal when viewed in plan. One of the top and bottom faces acts as a seating face and the other acts as a cutting face. There are first cut- ting edges formed on opposite sides of the cutting face at the juncture of the cutting face with the peripheral wall. One end of each of the first cutting edges termi- nates in a juncture with a second cutting edge that extends from the cutting face toward the seating face. The first and second cutting edges cooperate to form a radiused hole when rotated about a central axis.

431130

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