Drill bit for a rock drilling tool with increased toughness...

Details Drill bit for a rock drilling tool with increased toughness... Drill bit for a rock drilling tool with increased toughness...

E - Fixed Constructions

21

B

E21B 10/56 (2006.01) B22F 3/24 (2006.01) C21D 7/04 (2006.01)

Patent

CA 2720063

Drill bit (10) for a rock drilling tool (12), which drill bit (10) has a drilling surface (lOb) that contacts rock during drilling. A longitudinal cross section (lOt) of the drill bit (10) through the drilling surface (10b) exhibits the following relationships of Ltot(depth)/Ltot(5.0) and H(depth)/H(5.0) at the specied depths, where H(depth)/H(5.0) is measured according to a Vickers test and Ltot(depth)/Ltot(5.0) is measured according to the Palmqvist method, described in this document substantially along the drill bit's longitudinal axial centre line (C): (table (I)). If the drill bit (10) has en length (L) of 10mm or greater, and a longitudinal cross section (10t) of the drill bit (10) through the drilling surface (lOb) exhibits the following relationships of Ltot(depth)/Ltot(3.5) and H(depth)/H(3.5) at the specified depths, where H(depth)/H(3.5) is measured according to a Vickers test and Ltot(depth)/Ltot(3.5) is measured according to the Palmqvist method described in this document, substantially along the drill bit's longitudinal axial centre line (C): (table (II)). If the drill bit (10) has en length (L) less than 10 mm.

Un trépan (10) pour un outil de forage de roche (12) a une surface de forage (10b) qui est en contact avec la roche pendant le forage. Une section longitudinale (10t) du trépan (10) à travers la surface du forage (10b) présente les relations suivantes de Ltot (profondeur)/Ltot (5,0) et H (profondeur)/H (5,0) aux profondeurs spécifiées, où H (profondeur)/H (5,0) est mesuré selon une méthode Vickers et Ltot (profondeur)/Ltot (5,0) est mesuré selon le procédé de Palmqvist, décrit dans ce document, sensiblement le long de la ligne centrale axiale longitudinale (C) du trépan : si le trépan (10) a une longueur (L) de 10 mm ou plus, et une section longitudinale (10t) du trépan (10) à travers la surface de forage (10b) présente les relations suivantes de Ltot (profondeur)/Ltot (3,5) et H (profondeur)/H (3,5) aux profondeurs spécifiées, où H (profondeur)/H (3,5) est mesuré selon une méthode Vickers et Ltot (profondeur)/Ltot (3,5) est mesuré selon le procédé de Palmqvist décrit dans ce document, sensiblement le long de la ligne centrale axiale longitudinale (C) du trépan : si le trépan (10) a une longueur (L) inférieure à 10 mm.

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