Stiff drill

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B - Operations, Transporting

23

B

B23B 51/02 (2006.01) B23B 51/00 (2006.01)

Patent

CA 2346394

A generally cylindrical drill, particularly an insert drill having multiple cutting inserts (16, 18), helical chip grooves (24) to clear the chips from the hole, and a gripping shank (22) opposite the cutting end (12) of the drill, wherein the drill experiences an unbalanced resultant transverse force (40) upon the cutting tip (12) of the drill, and that resultant (40) is oriented perpendicularly to an axial plane containing the neutral axis (36) of the maximum bending stress adjacent to its juncture with the gripping shank (22).

La présente invention concerne un foret, généralement cylindrique, notamment un foret à inserts présentant de multiples inserts de coupe (16, 18), des rainures d'enlèvement de copeaux hélicoïdales (24) permettant de retirer les copeaux de l'alésage, ainsi qu'un corps de fixation (22) situé à l'opposé de l'extrémité de coupe (12) du foret. Le foret exerce une force transversale résultante non équilibrée (40) sur la pointe de coupe (12) du foret et cette force résultante (40) est orientée de façon perpendiculaire à un plan axial contenant l'axe neutre (36) de la contrainte de flexion maximale qui est adjacente à sa jointure avec le corps de fixation (22).

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