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US 2022/0339714 A1Published application
Twist drill bit having a cutting tip with a stepped structure
AssigneeGuehring KG
InventorMarkus KRAUS
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AssigneeGuehring KG
InventorMarkus KRAUS
Estimating the term…
Twist drill bit having a cutting tip (3) with a stepped structure, consisting of a shank (1), a guide region (2) and the adjoining cutting tip (3) with a stepped structure, the stepped structure of which is interrupted by two flutes (5) winding about a drill bit axis (0), wherein the cutting tip (3) with a stepped structure has a drill bit tip (3.1) with a radius (ro), at which a pair of first main lips (4.1) are formed, and a multiplicity of coaxially arranged cutting steps (3.2), which each have a conical step portion (3.2.1), in which in each case a pair of further main lips (4.2a-4.2m) are formed, and a cylindrical step portion (3.2.2), wherein the cylindrical step portions (3.2.2) have, towards the shank (1) , an increasingly large radius (ra-rm), wherein the difference between in each case one of the radii and the next one of the radii (Ar) is chosen such that, upon rotation about the drill bit axis (0), the pair of further main lips (4.2a-4.2m) arranged therebetween sweep in each case over an annular face (Aa-Am), coaxial with the drill bit axis (0), on an imaginary plane (E) arranged perpendicularly to the drill bit axis (0), and the annular faces (Aa-Am) have an identical surface area, such that, during drilling, an identical chip volume is carried away with each pair of the further main lips (4.2a-4.2m).
A twist drill bit having a cutting tip with a stepped structure, consisting of a shank, a guide region, and the adjoining cutting tip with a stepped structure, the stepped structure of which is interrupted by two chip flutes winding about a drill bit axis, wherein the cutting tip with a stepped structure is a drill bit tip with a radius, at which a pair of first main cutting edges is formed, and which has a plurality of coaxially arranged cutting steps, which in each case have a conical step portion, in which a pair of further main cutting edges is formed in each case, and a cylindrical step portion, wherein the cylindrical step portions have an increasingly larger radius towards the shank, wherein a difference between a respective one of the radii and a next one of the radii is selected so that upon rotation about the drill bit axis, the pair of the further main cutting edges arranged therebetween in each case sweeps over an annular surface, which is coaxial to the drill bit axis, on an imaginary plane, which is arranged perpendicularly to the drill bit axis, and the annular surfaces have an identical surface area, so that an identical chip volume is removed during the drilling with each pair of the further main cutting edges.
A twist drill bit having a cutting tip with a stepped structure, consisting of a shank and the cutting tip with a stepped structure adjoining directly or indirectly thereon, the stepped structure of which is interrupted by two chip flutes winding about a drill bit axis, wherein the cutting tip with a stepped structure has a drill bit tip with a radius, at which a pair of first main cutting edges are formed, and a plurality of coaxially arranged cutting steps, which in each case have a conical step portion, in which a pair of further main cutting edges is formed in each case, and a cylindrical step portion, wherein the cylindrical step portions have an increasingly larger radius towards the shank, wherein a difference between a respective one of the radii and a next but one of the radii is selected so that upon rotation about the drill bit axis, the two pairs of the further main cutting edges arranged therebetween in each case sweep over an annular surface, which is coaxial to the drill bit axis, on an imaginary plane, which is arranged perpendicularly to the drill bit axis, and the annular surfaces have an identical total surface area in pairs, so that an identical total chip volume is removed in each case during the drilling with two adjacent pairs of the further main cutting edges.
Dependencies are inferred from the claim text.