Multi-blade solid carbide drill

Details Multi-blade solid carbide drill Multi-blade solid carbide drill

B - Operations, Transporting

23

B

B23B 51/02 (2006.01) B24B 19/04 (2006.01)

Patent

CA 2727796

The invention relates to a multi-blade solid carbide drill for cutting high-strength sandwich materials. The tool comprises a shaft section and an adjoining cutting part, into which a number of chip flutes that corresponds to the number of main blades is incorporated. In order to reinforce the curvature of the resulting chip, the chip flute of the drill comprises a chip flute rib in the region of the chip formation zone, said rib protruding from the chip flute surface and having a substantially wave-shaped cross-section (28), and said rib dividing the chip flute into two sections, a first chip flute section (30) forming the cutting rake and a second chip flute (32) forming the chip flute runout.

Foret en métal dur plein à plusieurs tranchants, destiné à l'enlèvement de copeaux de matériaux en sandwich de haute résistance. Cet outil comporte une partie queue prolongée par une partie coupe dans laquelle est façonné un nombre de goujures correspondant au nombre de tranchants principaux. Afin de renforcer la courbure du copeau produit, la goujure du foret, dans une zone de formation des copeaux, présente un talon (28) en saillie de la surface de la goujure, de section transversale sensiblement ondulée, ce talon divisant la goujure en deux parties, une première partie de goujure (30) formant la face coupante et une deuxième partie de goujure (32) formant la sortie de goujure.

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