Drilling tool having point thinning

摘要

A rotatable drilling tool has cutting edges (on a face side) that merge inwardly into a chisel edge, with the chisel edge(s) running on the face side about a central region surrounding the tool axis, with the chisel edges forming, in the innermost region (or about a point thinning region), a residual chisel edge, with cutting edge corners being formed at the outer ends of the main cutting edges, with a straight connecting line that runs through two cutting edge corners of main cutting edges situated opposite one another in relation to the tool axis, or if an opposite main cutting edge is not present, through a cutting edge corner and the tool axis, with the chisel edge inner region running from the outer end of the residual chisel edge within a region with an angle of between −15° and +15° in relation to a parallel to the connecting line.

主权项

1. A drilling tool:
a) which is rotatable about a central tool axis, b) which has at least two main cutting edges which are arranged on a face side and which merge in the inward direction toward the tool axis into at least one chisel edge, c) with the chisel edge running on the face side in or over a central region surrounding the tool axis, d) with the chisel edge, in at least one point thinning region, forming an inner region of curvature and an outer region of curvature as viewed relative to the central axis, e) with the inner region of curvature being curved oppositely to the outer region of curvature, f) with the chisel edge having, in the at least one point thinning region, an at least approximately straight chisel edge outer region, and adjoining the chisel edge outer region in the inward direction, an at least approximately straight chisel edge inner region, with the inner region of curvature being situated between the chisel edge inner region and chisel edge outer region, g) with the chisel edge forming a residual chisel edge, the residual chisel edge extending from the chisel edge inner region toward the central axis, h) with the outer region of curvature having a left-hand curvature in the direction to the tool axis, and with the inner region of curvature having a right-hand curvature in the direction to the tool axis.