The invention relates to a drilling tool (11) for bores in solid material, comprising a drill shank (26) which has a radially inner indexable insert (13) at an inner chip space (21) and a radially outer indexable insert (14) at an outer chip space (22), the working areas of which indexable inserts (
The invention relates to a drilling tool (11) for bores in solid material, comprising a drill shank (26) which has a radially inner indexable insert (13) at an inner chip space (21) and a radially outer indexable insert (14) at an outer chip space (22), the working areas of which indexable inserts (13, 14) overlap, the inner chip space (21) having a cover (36) which extends at least partly along the shank longitudinal axis (20), and the inner chip space (21) merging into the outer chip space (22), so that the chip discharge is effected via a common chip space (23) in the rear area (32) of the drilling tool (11).
대표청구항▼
[ I claim:] [1.] A drilling tool for boring solid metal material, comprising:a drill shank (26) having a longitudinal axis (20) and an end face (12), at least one axially extending recess (21, 22) and at least two indexable inserts (13, 14), in whichsaid indexable inserts are arranged at different r
[ I claim:] [1.] A drilling tool for boring solid metal material, comprising:a drill shank (26) having a longitudinal axis (20) and an end face (12), at least one axially extending recess (21, 22) and at least two indexable inserts (13, 14), in whichsaid indexable inserts are arranged at different radial distances from said longitudinal axis (20), are at least similar geometrically, have working areas that overlap, and have two cutting edges (16, 17, 18, 19) that are of the same length, are inclined adjacent to one another, are arranged at an obtuse angle to one another, and are in cutting engagement simultaneously,a radially inner indexable insert (13) slightly overlapping said drill axis (20) with one engaged cutting edge (16), a radially outer indexable insert (14) forming a drill diameter with an engaged cutting edge (18), and at least one angle bisector (28, 29) of said cutting edges (16, 17, 18, 19) being inclined at an angle (.alpha.) relative to said longitudinal axis (20), and in whichat least one cover (36) extends axially from said end face (12) of said drilling tool, is arranged in at least one of said recesses (21, 22), and forms an integral portion of said drill shank (26).
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이 특허에 인용된 특허 (3)
Davidson Jerry W. (Valley Center KS), Drill bit for drilling a hole in layered material of different hardness.
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