Percussive drill bit for rock drilling and method for the...

E - Fixed Constructions – 21 – B

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E21B 10/36 (2006.01)

Patent

CA 2705737

The invention relates to a drill bit intended for percussive rock drillingof the type that comprises a front head (5) and a tubular skirt (6), whichextends rearward from the head to a rear, ring-shaped end and include--san internalthread(17) for the transfer ofcombined impact and rotary motions to the drill bit. Therear endof the skirt(6) is, viaan unelastic joint (24), e.g., a friction weld, united to a front end of a sleeve(4) havingan envelope surface, from which a plurality of projections (29) being peripherically spaced-apart-from each other project, e.g., ridges, having the purpose of guiding the drill bit inthe drill hole. By assemblingthe drill bit oftwo parts, the internal thread(17) can be turned with high accuracy and smoothness, at the same time as the drill bit is givenan inherent good controllability. In anadditional aspect,the invention also relates to a method for the manufacture of such a drill bit.

Cette invention concerne un trépan conçu pour le forage à percussion de roches, du type qui comprend une tête avant (5) et une jupe tubulaire (6) qui s'étend de la tête vers une extrémité arrière en forme d'anneau et comprenant un filetage interne (17) pour le transfert au trépan de mouvements combinés d'impact et de rotation. L'extrémité arrière de la jupe (6) est reliée, par l'intermédiaire d'un joint non élastique (24), par exemple un joint de soudage par friction, à une extrémité avant d'un manchon (4) ayant une surface formant enveloppe. Une pluralité de projections (29), par exemple des arêtes, mutuellement espacées dans le sens périphérique, font saillie à partir de ladite surface dans le but de guider le trépan dans le trou de forage. L'assemblage en deux parties du trépan permet d'usiner le filetage interne (17) avec grande précision et régularité tout en lui conférant une bonne contrôlabilité intrinsèque. Selon un aspect supplémentaire, l'invention concerne également un procédé de fabrication d'un tel trépan.

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