Multi-purpose drilling tool
AssigneeRobert Bosch GmbH
InventorsHelmut Duscha, August Haussmann
Life of this patent
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Abstract
The present invention relates to a multi-purpose drilling tool with a boring head, a drill twist connected thereto and a downstream clamping shank, a cutting element (1) being provided on the working side of the boring head. The cutting element (1) has a face (9, 24) with a rake angle (γ) having a value of γ≧0° b, the cutting element (1) having a flank (10, 13) with a lip clearance angle (α) having a value of 5°≦α≦15° and, in particular, α≈10°.
Claims13
A multi-purpose drilling tool (27) with a boring head (28), a drill twist (29) connected thereto and a downstream clamping shank (30), a cutting element (1) being provided on the working side of the boring head (28), wherein the cutting element (1) has a face (9, 24), at least a portion of the face (9, 24) having a rake angle (γ) with a value of γ=0° and with a leading edge (25) extending parallel to a longitudinal drill bit axis (2), and a lateral surface (16,17),
- wherein the cutting element (1) has at least one flank (10, 13) with a lip clearance angle (α) having a value of 5°≦α≦15°,
- wherein the cutting element (1) is limited laterally by two longitudinal sides (5, 6) and two transverse sides (7, 8),
- wherein a cutting lip (3) of cutting element (1) tapers from the transverse side (7) toward the longitudinal drill bit axis (2) from a width (SH) to a width (SQ),
- wherein the cutting element (1) has at least one cutting edge (11, 12) formed by the face (9, 24) and the flanks (10, 13),
- wherein the flanks (10, 13) meet at a chisel edge (14), said chisel edge (14) also joining the cutting edges (11, 12), and
- wherein the face (9) extends toward a plane (E16) of the lateral surface (16) at an acute taper angle (λ).
Dependencies are inferred from the claim text.