Rotatable cutting tool and cutting tool body

E - Fixed Constructions – 21 – C

Patent

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Details

E21C 27/20 (2006.01) E01C 23/088 (2006.01) E21C 35/183 (2006.01)

Patent

CA 2665079

A rotatable cutting tool (20) carried in a bore of a holder. The rotatable cutting tool (20) includes an elongate cutting tool body (22) that has a central longitudinal axis (L-L), an axial forward end (24) and an axial rearward end (26). The cutting tool body has an axial forward hardness region (60) having a first average hardness, a rearward hardness region (64) having a third average hardness, and a transition hardness region (62) mediate of and contiguous with the axial forward hardness region (60) and the axial rearward hardness region (64), the transition hardness region (62) having a second average hardness. The second average hardness is less than the first hardness, and the third average hardness is less than the second average hardness.

L'invention concerne un outil de coupe rotatif (20) supporté dans un alésage d'un support. L'outil de coupe rotatif (20) comporte un corps d'outil de coupe allongé (22) qui a un axe longitudinal central (L-L), une extrémité avant axiale (24) et une extrémité arrière axiale (26). Le corps d'outil de coupe possède une zone de dureté avant axiale (60) qui a une première dureté moyenne, une zone de dureté arrière (64) qui a une troisième dureté moyenne, ainsi qu'une zone de dureté de transition (62) intermédiaire entre la zone de dureté avant axiale (60) et la zone de dureté arrière axiale (64) et contiguë à celles-ci, la zone de dureté de transition (62) ayant une deuxième dureté moyenne. La deuxième dureté moyenne est inférieure à la première dureté, et la troisième dureté moyenne est inférieure à la seconde dureté moyenne.

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