Cutting insert for percussion drill bit

Details Cutting insert for percussion drill bit Cutting insert for percussion drill bit

E - Fixed Constructions

21

B

E21B 10/56 (2006.01)

Patent

CA 2424784

A cutting insert for a gauge row of a percussion drill bit includes a generally cylindrical mounting portion (24) extending along a central axis and a cutting head (28) extending from the mounting portion. The head has an exposed surface (30) forming a non-symmetrical dome shape such that the working portion (32) of the head is enlarged with respect to a standard dome shape and a trailing portion (34) is reduced with respect to a standard dome shape. The cutting head has an inner (36) and an outer edge (38). The exposed surface is non-symmetrical along a central plane (44) which bisects the working (32) and trailing portion (34). The exposed surface (30) is symmetrical in second plane perpendicular (7, 8, 9) to the central plane such that the exposed surface (30) forms an arc of constant radius from the inner edge (36) to the outer edge (38) in the second planes (7, 8, 9).

L'invention concerne un insert de découpe pour un rang de calibre d'un outil de forage à percussion qui comporte une partie de montage généralement cylindrique (24) orientée le long d'un axe central et une tête de découpe (28) partant de la partie de montage. La tête possède une surface exposée (30) en forme de dôme non-symétrique, de manière à ce que la partie de fonctionnement (32) de la tête soit élargie par rapport au dôme de forme standard et une partie postérieure (34) réduite par rapport au dôme de forme standard. La tête de découpe possède un bord interne (36) et un bord externe (38). La surface exposée est non-symétrique le long d'un plan central (44) qui sectionne en deux parties la partie de fonctionnement (32) et la partie postérieure (34). La surface exposée (30) est symétrique dans le second plan perpendiculaire (7, 8, 9) au plan central, de manière à ce que la surface exposée (30) puisse former un arc de radius constant partant du bord interne (36) vers le bord externe (38) dans le second plan (7, 8, 9).

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