Rotating boring tool

B - Operations – Transporting – 27 – G

Patent

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Details

B27G 15/00 (2006.01) B23B 31/00 (2006.01) B23B 51/02 (2006.01)

Patent

CA 2198736

A rotating boring tool (10) comprises a cylindrical shank (11) and a body (12), both of which are coaxial with each other, said body being provided at its tip end with cutting blades (13a, 13b) which are in point symmetry with respect to an axis of the shank. Provided on the body are two flutes (14a, 14b) continuous from the cutting blades. The both flutes are made to approach each other at the lower half lead portions (designated hereinbelow as f1 portions) of terminal end portions f0 of the flutes and positioned about 35 degrees or more offset from the position of point symmetry. Alternatively, the both flutes are merged at the f1 portions. Accordingly, thickened portions y0 are formed on the f1 portions to increase rigidity of the f1 portions. As a result, it is possible to suppress generation of fatigue failure at the f1 portions whereby a rotating boring tool of long service life which is hard to break is obtained and a product cost and a cost for tool replacement are considerably reduced.

Un outil rotatif du type foret (10) comprend une tige cylindrique (11) et un corps (12) qui sont coaxiaux, ledit corps étant pourvu à son extrémité de lames de coupe (13a) (13b) qui sont symétriques par rapport à l'axe de l'arbre. Deux rainures (14a) (14b) sont aménagées sur le corps en prolongement des lames de coupe. Les deux rainures se rapprochent l'une de l'autre dans la moitié avant (partie f1) des portions d'extrémité f0 des rainures et elles sont décalées d'environ 35 degrés ou plus de la position du point de symétrie. Les deux rainures peuvent également fusionner dans les portions f1. Dans ces conditions, on a des portions épaissies y0 sur les portions f1 pour augmenter la rigidité des portions f1. Il est ainsi possible de supprimer les cassures de fatigue dans les portions f1 et d'obtenir un outil rotatif du type foret qui a une durée de vie utile prolongée et qui ne se casse qu'avec difficulté. Le coût de fabrication de l'outil est diminué ainsi que le coût de son remplacement.

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