B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 51/02 (2006.01) B23B 51/00 (2006.01) B23P 15/32 (2006.01)
Patent
CA 2382942
A drill including a shank portion and a cylindrical body portion contiguous to each other. The cylindrical body portion includes (a) primary cutting edges and secondary cutting edges formed in its axially distal end portion such that each of the secondary cutting edges is located on a radially inner side of the corresponding primary cutting edge (b) primary rake surfaces of the primary cutting edges and secondary rake surfaces of the secondary cutting edges; and (c) inclined surfaces each of which extends from the corresponding secondary rake surface to a periphery of the cylindrical body portion, and is inclined such that an axial distance between each of the inclined surfaces and the shank portion is reduced as viewed in a direction substantially perpendicular to the corresponding secondary cutting edge, from the corresponding secondary rake surface toward the periphery of the cylindrical body portion. Each of the secondary rake surfaces and the corresponding secondary cutting edge are formed together with each other in a web thinning. Each of the secondary rake surfaces and the corresponding inclined surface are connected to each other without a step therebetween.
Kasuya Kazuhisa
Kobaysahi Kenjiro
Osawa Jiro
Takikawa Yoshihiro
Yamamoto Takahiro
Borden Ladner Gervais Llp
Osg Corporation
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