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US 7,296,954 B2Granted
Drilling tool for cutting cast materials
AssigneeJoerg Guehring
InventorPeter Haenle
Life of this patent
Estimating the term…
Abstract
A drill for hard materials, comprising webs that are subdivided by means of cutting grooves, and at least one principal cutting edge, each of which is provided with a cutting corner and a transition to a chisel edge. At least some sections of the principal cutting edge are continuously convex in an axial direction starting from the cutting edge.
Claims25
A drill for hard materials comprising:
- webs that are subdivided by means of cutting grooves;
- at least a first principal cutting edge, each said principal cutting edge being provided with a cutting corner and a transition to a chisel edge, said first principal cutting edge being convex from said cutting corner to said chisel edge;
- and
- at least two free faces associated with each principal cutting edge.
1 more element
A drill for hard materials comprising:
- webs that are subdivided by means of cutting grooves;
- at least one principal cutting edge, each said principal cutting edge being provided with a cutting corner and a transition to a chisel edge, at least some sections of each principal cutting edge being continuously convex in an axial direction starting with each said cutting corner, said continuously convex section of the principal cutting edge bordering substantially tangentially on a central section, the principal cutting edge running linearly at an acute angle to the chisel edge;
- and
- a correction grinding of the principal cutting edge merging into a web thinning without any transition so that they can be ground in one operation.
1 more element
A drill for hard materials comprising:
- webs that are subdivided by means of cutting grooves;
- at least one principal cutting edge, each said principal cutting edge being provided with a cutting corner and a transition to a chisel edge, at least some sections of each principal cutting edge being continuously convex in an axial direction starting with each said cutting corner;
- and
- a correction grinding of the principal cutting edge merging into a web thinning without any transition so that they can be ground in one operation.
1 more element
Dependencies are inferred from the claim text.