Drill bit for a rock drilling tool with increased toughness and method for increasing the toughness of such drill bits

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United States of America Patent

PATENT NO 8720613
APP PUB NO 20110000717A1
SERIAL NO

12736135

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Abstract

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Drill bit (10) for a rock drilling tool (12), which drill bit (10) has a drilling surface (10b) that contacts rock during drilling. A longitudinal cross section (10t) 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 center line (C): (table (I)). If the drill bit (10) has en length (L) of 10 mm or greater, and a longitudinal cross section (10t) of the drill bit (10) through the drilling surface (10b) 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 center line (C): (table (II)). If the drill bit (10) has en length (L) less than 10 mm.

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Patent Owner(s)

Patent OwnerAddress
EPIROC DRILLING TOOLS AKTIEBOLAG737 25 FAGERSTA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Carlsson, Jimmy Fagersta, SE 5 10
Rehnström, Mattias Fagersta, SE 1 3
Stenberg, Göran Fagersta, SE 4 8

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