Indexable drill and cutting inserts therefor

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 51/02 (2006.01) B23B 51/04 (2006.01) B23C 5/22 (2006.01)

Patent

CA 2395479

The invention relates to an indexable drill (10) for drilling a hole in a metal workpiece. The drill includes an elongated generally cylindrical body (12) having a central longitudinal axis and a pair of cutting inserts (24). The body (12) includes a tip end portion (14) having first and second recessed pockets (22) on generally diametrically opposite sides of the longitudinal axis. Each cutting insert (24) is removably secured within a pocket (22) and includes at least one cutting edge (32) having an outer peripheral corner and an inner corner. The at least one cutting edge (32) extends linearly from the outer peripheral corner (32a) to a curve (32b) extending convexly toward an inner region proximate the central longitudinal axis (C) and then to a linear relief edge (32c) extending linearly from the inner region in a direction away from the longitudinal axis (C) to the inner corner.

L'invention concerne un foret amovible (10) destiné à percer un trou dans une pièce métallique. Le foret comprend un corps allongé (12), généralement cylindrique, possédant un axe longitudinal central et une paire de plaquettes de coupe (24). Le corps (12) comprend une partie d'extrémité distale (14) comportant des première et seconde poches en retrait (22) sur des côtés, généralement diamétralement opposés, de l'axe longitudinal. Chaque plaquette de coupe (24) est fixée amovible dans une poche (22) et comprend au moins un bord de coupe (32) présentant un coin périphérique extérieur et un coin intérieur. Ce bord de coupe (32) s'étend linéairement à partir du coin périphérique extérieur (32a) et se termine en une courbe (32b) s'étendant de manière convexe vers une région intérieure proche de l'axe longitudinal central (C) puis vers un bord à relief linéaire (32c) qui s'étend linéairement de la région intérieure dans une direction s'éloignant de l'axe longitudinal (C) et allant vers le coin intérieur.

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