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US 8,628,278 B2Granted
Drill
AssigneeMapal Fabrik fur Prazisionswerkzeuge Dr. Kress KG
InventorUlrich Krenzer
Life of this patent
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Abstract
A drill having end-face major surfaces, contiguous faces descending from the major cutting edges and flanks contiguous to the major cutting edges. Center cutting edges are formed by end-face taperings. A chisel cutting edge is between the center cutting edges. Shapes of the cutting edges are disclosed. First ones of the flanks are angled to create an outward apex angle so that the major cutting edges and the center cutting edges run at a constant taper angle.
Claims18
A drill, comprising:
- a drill end face;
- at least two end-face major cutting edges on the end face;
- first faces contiguous to the major cutting edges and the first faces descending in a first direction;
- first flanks contiguous respectively to the at least two major cutting edges and the first flanks descending in a second opposite direction with respect to the first faces;
- at least two end-face taperings out, each forming a center cutting edge which is contiguous to the major cutting edges;
- second faces descending in the first direction and contiguous to the at least two end-face taperings out;
- a chisel cutting edge running between the at least two center cutting edges;
- minor cutting edges provided in a region of a circumferential surface of the drill, each major cutting edge being associated with a respective minor cutting edge;
- the at least two major cutting edges being formed by a line of intersection of the first faces with the first flanks;
- the first faces of the major cutting edges and the second faces of the center cutting edges being arranged at an obtuse angle to one another;
- the first flanks having respective segments, and the segments are arranged at an obtuse angle to one another;
- the segments of the first flanks being associated with the second faces of the center cutting edge and to the first faces of the major cutting edge;
- the center cutting edges adjoining the major cutting edges;
- and
- the first flanks being angled opposite to the first and second faces so that the major cutting edges and the center cutting edges run at a constant apex angle α outward in the direction of a circumferential surface of the drill.
12 more elements
Dependencies are inferred from the claim text.