Hermispherical head, evolutive cut drilling bit

B - Operations – Transporting – 23 – B

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B23B 51/02 (2006.01) B23B 31/00 (2006.01) B23B 41/00 (2006.01) B23C 5/10 (2006.01)

Patent

CA 2137437

L'extrémité coupante (7) ou tête d'un foret (1) à gorges hélicoïdales présente une forme générale hémisphérique et comporte quatre lèvres de coupe dont deux (8, 9) sont disposées fil à fil, au sommet S du foret. L'angle de coupe de l'arête desdites lèvres est évolutif et varie de zéro degré au sommet S jusqu'à une valeur déterminée expérimentalement en fonction du matériau à usiner au point P, à l'extrémité du diamètre d du foret.

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