A rock drill bit and cutting inserts

Details A rock drill bit and cutting inserts A rock drill bit and cutting inserts

E - Fixed Constructions

21

B

E21B 10/56 (2006.01)

Patent

CA 2200726

The present invention relates to a cutting insert for a rock drill bit and a rock drill bit including such a cutting insert. It has the object of increasing the wear resistance of the cemented carbide cutting insert. The inserts are formed with a generally cylindrical shank portion and a convexly formed outer portion. In one embodiment of the invention, the cemented carbide of the insert includes a number of zones and the border between two adjacent zones describes a non-symmetrical path seen both in a cross-sectional side view and in a cross-sectional top view. In a further embodiment, the inserts also are provided with increased volume portions in the parts of the insert being most subjected to wear.

L'invention concerne un élément de coupe pour fleuret de perforatrice et un fleuret de perforatrice comprenant ledit élément de coupe. Elle permet d'augmenter la résistance à l'usure de l'élément de coupe en carbure cémenté. Ces éléments possèdent une partie tige généralement cylindrique et une partie extérieure convexe. Dans un mode de réalisation de l'invention, le carbure cémenté de l'élément de coupe comprend plusieurs zones et la frontière entre deux zones contigües décrit un trajet asymétrique, tel qu'on le voit à la fois en section transversale latérale et en section transversale supérieure. Dans un autre mode de réalisation, ces éléments comportent également des parties amplifiées en volume dans les zones les plus exposées à l'usure.

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