Cemented tungsten carbide rock bit cone

E - Fixed Constructions – 21 – B

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E21B 10/50 (2006.01)

Patent

CA 2657926

An earth-boring bit (11) has a steel body (13) and bearing pin for rotatably supporting a cone. The cone has an exterior surface containing rows of cutting elements. The cone (21) and cutting elements (35) are formed of cemented tungsten carbide. The cone may be manufactured by applying pressure to a mixture of hard particles and metal alloy powder to form a billet, then machining the billet to a desired over-sized conical shaped product. Then the conical-shaped product is liquid-phase sintered to a desired density, which causes shrinking to the desired final shape.

L'invention concerne un trépan de forage (11) qui présente un corps en acier (13) et une broche support pour supporter de façon rotative un cône. Le cône présente une surface extérieure contenant des rangées d'éléments de coupe. Le cône (21) et les éléments de coupe (35) sont formés de carbure de tungstène cémenté. Le cône peut être produit en appliquant une pression à un mélange de particules dures et de poudre d'alliage métallique afin de former une billette, pour ensuite usiner la billette afin d'obtenir un produit conique surdimensionné souhaité. Ensuite, le produit conique est fritté en phase liquide jusqu'à une densité souhaitée qui provoque une perte de volume jusqu'à la forme finale souhaitée.

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