Flat bottom tool

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 27/00 (2006.01) B23B 51/00 (2006.01) B26D 1/12 (2006.01)

Patent

CA 2341367

The present invention is a drilling system for cutting flat bottomed holes in work pieces. The tool has two opposing angled cutting edges (62, 64) extending upwardly to create an overlapping web (70) at the center. The angle at which the inner portion of the cutting edge (62, 64) is inclined is increased to create a center point on the cutting surface of the tool. The cutting edge (62, 64) has a rake surface with a positive rake angle (80) that lessens the forces on an insert (35), and also allows for letter formation of chips of stock material being removed. Chip breakers (82) can be cut into the cutting edges (62, 64) of the insert (35), further aiding in the removal of stock material.

La présente invention concerne un système de perçage pour trous à fond plat. L'outil comporte deux bords de coupe (62, 64) disposés obliquement et en sens opposé à partir de l'axe de rotation. Les parties intérieures de ces bords de coupe se prolongent vers le haut pour former une âme centrale (70) par chevauchement. Cette âme contribue à renforcer la partie centrale des bords de coupe (62, 64) de l'outil. L'angle d'inclinaison de la partie intérieure du bord de coupe peut être augmenté pour former un point central sur la surface de coupe de l'outil. Ce point central participe à la stabilité de l'outil lorsque ce dernier tourne sur son axe longitudinal. Le bord de coupe (62, 64) comporte une surface de ratissage à angle de travail positif (80) qui réduit les forces s'exerçant sur la plaquette (35) et qui favorise la formation de copeaux. Des brise-copeaux peuvent être pratiqués dans les bords de coupe (62, 64) de la plaquette (35), ce qui facilite encore l'évacuation du matériau fraisé.

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