Diamond-coated button insert for drilling and percussive...

Details Diamond-coated button insert for drilling and percussive... Diamond-coated button insert for drilling and percussive...

E - Fixed Constructions

21

B

E21B 10/56 (2006.01)

Patent

CA 2298636

A button insert for a percussive drill bit comprises a carbide base and a diamond layer bonded thereto. The diamond layer forms a dome-shaped cutting surface which is of symmetrical configuration about a center axis of the insert. A crest portion of the cutting surface has a larger radius of curvature than a peripheral portion thereof. The cutting surface can be formed by numerous radii, or can be of constantly varying radius (i.e., elliptical).

L'invention concerne un insert à pastilles pour trépan à percussion, l'insert comprenant une base en carbure à laquelle est liée une couche de diamant. La couche de diamant forme une surface de coupe en dôme présentant une configuration symétrique autour d'un axe central de l'insert. Une partie de crête de la surface de coupe possède un rayon de courbure plus grand qu'une partie périphérique de cette surface. La surface de coupe peut être formée par plusieurs rayons ou peut présenter un rayon à variation constante (c'est-à-dire elliptique).

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