Self-chamfering drill bit

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 51/04 (2006.01) B23B 51/10 (2006.01)

Patent

CA 2196865

A self-chamfering drill bit is disclosed having a shank (12) with a longitudinal groove (28) formed therein. A resilient, cantilevered insert (36) is located in the groove. The insert has a radially projecting cutting tip (44) formed thereon. The cutting tip has forward and rearward bevelled cutting edges (46,48) formed thereon, so that as the drill advances to make a hole in a workpiece (60), the cutting tip forward bevelled cutting edge chamfers the front side of the hole. The cutting tip 'then retracts into the groove as it passes through the workpiece, and as the cutting tip emerges from the backside of the workpiece, the cutting tip rearward bevelled cutting edge automatically chamfers the backside of the hole being made in the workpiece.

L'invention conerne un foret à auto-chanfreinage présentant une tige (12) dans laquelle est formée une gorge longitudinale (28). Une pièce rapportée (36) saillante résiliente est placée dans la gorge. Sur la pièce rapportée est formée une extrémité (44) coupante saillante radialement. L'extrémité coupante présente des bords coupants (46, 48) biseautés vers l'avant et vers l'arrière de sorte que, à mesure que le foret avance pour percer un trou dans un pièce à usiner (60), le bord coupant biseauté vers l'avant de l'extrémité coupante chanfreine la face antérieure du trou. Ensuite, l'extrémité coupante se rétracte dans la gorge à mesure qu'elle passe à travers la pièce à usiner, et à mesure que ladite extrémité coupante sort du côté arrière de ladite pièce à usiner, le bord coupant biseauté arrière de l'extrémité coupante chanfreine automatiquement le côté arrière du trou percé dans ladite pièce à usiner.

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