E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/36 (2006.01) B23K 9/00 (2006.01) E21B 10/56 (2006.01)
Patent
CA 2391359
The present invention relates to a method for the manufacturing of drill bits for percussive rock drilling and a rock drill bit (10) and a button (14A). The rock drill bit includes a head portion (11) with a forward surface (13; 15), which has a number of buttons (16) provided in a peripheral wreath, and a number front buttons (14A) placed inside the peripheral buttons (16). At least one of said buttons has a diameter (D) and a height (H). The button (14A) is welded to an essentially flat part of the forward surface. The button is metallurgically bound to the forward surface (13, 15) and the following formula applies: H/D < 1.2.
La présente invention concerne, d'une part un procédé de fabrication de taillants pour forage de roche à percussion, d'autre part un tel taillant pour forage de roche (10), et enfin une bosse (14A). Le taillant pour forage de roche comporte une tête (11) dont la face antérieure (13, 15) est garnie de bosses (16) formant une couronne périphérique, et de bosses antérieures (14A) placées à l'intérieur des bosses de la périphérie (16). L'une au moins de ces bosses se distingue par son diamètre (D) et sa hauteur (H). La bosse (14A) est soudée sur une partie essentiellement plate de la face antérieure. La bosse est métallurgiquement liée à la face antérieure (13, 15) de façon à respecter la formule H/D<1,2.
Linden Johan
Lundell Lars-Gunnar
Gowling Lafleur Henderson Llp
Sandvik Ab
Sandvik Intellectual Property Ab
LandOfFree
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