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US 7,594,784 B2Granted
Cutting tool
AssigneeKennametal Inc.
InventorsUlrich F Krenzer, Herbert Kauper
Life of this patent
Estimating the term…
Abstract
Disclosed is a drilling tool comprising a first drill bit (2) that is provided with at least two forward cutting edges (4, 5) and a second drill bit (3) which encompasses at least two rear cutting edges (6, 7). A cutting groove (8, 9) runs continuously from one respective forward cutting edge (4, 5) to a rear cutting edge (6, 7). Said cutting groove (8, 9) is embodied in an asymmetric manner in an area (A) bordering the forward drill bit (2), in a symmetric manner in a central area (B), and asymmetric in an area (C) bordering the rear drill bit (3).
Claims20
A cutting tool comprising:
- a first cutting bit portion comprising at least two cutting edges;
- a second cutting bit portion comprising at least two cutting edges;
- a middle portion disposed between said first cutting bit portion and said second cutting bit portion;
- each of said first cutting bit portion and said second cutting bit portion and said middle portion together form an integral body;
- said first cutting bit portion comprising chip flutes comprising an asymmetrical cross-sectional profile about a radius of said cutting tool intersecting at approximately the middle of a corresponding one of said chip flutes;
- said second cutting bit portion comprising chip flutes comprising an asymmetrical cross-sectional profile about a radius of said cutting tool intersecting at approximately the middle of a corresponding one of said chip flutes;
- and
- said middle portion comprising chip flutes comprising a symmetrical cross-sectional profile about a radius of said cutting tool intersecting at approximately the middle of a corresponding one of said chip flutes.
5 more elements
A cutting tool comprising:
- a first cutting bit (2) and at least two forward cutting edges (4, 5);
- a second cutting bit (3) and at least two rear cutting edges (6, 7);
- chip flutes (8, 9) that run from each of the forward cutting edges (4, 5) to a corresponding one of the rear cutting edges (6, 7);
- and
- each of the chip flutes (8, 9) is realized so that its cross-sectional profile is in itself asymmetrical about a radius of said cutting tool in an area (A) adjacent to the forward cutting bit (2), in itself symmetrical about a radius of said cutting tool in a middle area (B) that connects said cutting bits, and in itself asymmetrical about a radius of said cutting tool in an area (C) adjacent to the rear cutting bit (3).
2 more elements
A rotary cutting tool having an axis of rotation, said cutting tool comprising:
- a first cutting bit portion comprising at least two cutting edges;
- a second cutting bit portion comprising at least two cutting edges;
- a middle portion disposed between said first cutting bit portion and said second cutting bit portion;
- each of said first cutting bit portion and said second cutting bit portion and said middle portion together form an integral body;
- said first cutting bit portion comprising a chip flute;
- said chip flute of said first cutting bit portion comprising an asymmetrical cross-sectional profile;
- said asymmetrical cross-sectional profile of said chip flute of said first cutting bit portion being divided into a first profile section and a second profile section, which said sections have substantially similar length and each is of different curvature with respect to one another;
- said second cutting bit portion comprising a chip flute;
- said chip flute of said second cutting bit portion comprising an asymmetrical cross-sectional profile;
- said asymmetrical cross-sectional profile of said chip flute of said second cutting bit portion being divided into a first profile section and a second profile section, which said sections have substantially similar length and each is of different curvature with respect to one another;
- said middle portion comprising a chip flute;
- said chip flute of said middle portion comprising a symmetrical cross-sectional profile;
- said symmetrical cross-sectional profile of said chip flute of said middle portion being divided into a first profile section and a second profile section, which said sections have the same length and the same curvature.
10 more elements
Dependencies are inferred from the claim text.