Drill bit and method for grinding a drill bit

Details Drill bit and method for grinding a drill bit Drill bit and method for grinding a drill bit

B - Operations, Transporting

23

B

B23B 51/02 (2006.01)

Patent

CA 2390877

The invention relates to a drill bit (2), having main cutting edges (4a, 4b) which are connected together by a transversal cutting edge (6). An open surface (7) which extends into a flute (8) lies adjacent to each main cutting edge. The drill bit (2) is ground, in particular, during a continuous three-dimensional grinding process in such a way that the open surface (7) forms a continuous curved surface which follows a radius of curvature (R) running from the main cutting edge (4a) in the direction of the flute (8). The continuous grinding process, in comparison to a conventional two- stage process, produces an improved drill bit geometry which is devoid of ridges (16). The ridge-free configuration reduces the mechanical stress during drilling to a minimum.

L'invention concerne une mèche (2) dotée de tranchants principaux (4a, 4b) reliés par une arête transversale (6) et délimitant une face de dépouille (7) qui se prolonge par une goujure (8). La mèche (2), en particulier lors d'un affûtage tridimensionnel continu, est aiguisée de telle sorte que la face de dépouille (7) forme une surface courbe, suivant un rayon de courbure (R), qui part du tranchant principal (4a) en direction de la goujure (8). L'affûtage continu, comparativement à l'affûtage habituel en deux temps, permet d'obtenir une meilleure géométrie de la mèche, qui est alors exempte d'arêtes (16). Grâce à sa forme sans arêtes, cette mèche ne subit que de faibles contraintes mécaniques lors du perçage.

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