Atlas Copco Secoroc Ab

Epiroc Drilling Tools Aktiebolag

Jimmy Carlsson

Göran Stenberg

Mattias Göthberg

Samuel Enblom

Alexander Beronius

Mattias Rehnström

Mattias GÖTHBERG

A drill bit for percussion rock drilling. An impact portion includes an impact surface for striking against rock in an impact direction. An engagement portion includes a holder configured to hold the drill bit axially in a drill head of a drill string, and a rotation engagement member configured to connect the drill bit with the drill head for rotating the drill bit. An anvil surface is directed opposite to the impact direction for receiving shock waves from a striker rod of the drill string. A flushing channel is configured to transfer flushing fluid to the impact surface. The holder and the anvil surface are inside a holder recess having an opening that is directed opposite to the impact direction. Also a drill string component, a system and a method.

Device and system for percussion rock drilling

Drill bit () for a rock drilling tool (), and a method of increasing the toughness of the drill bit, which drill bit () has a drilling surface () that contacts rock during drilling. A longitudinal cross section () of the drill bit () through the drilling surface () exhibits certain relationships of Ltot(depth)/Ltot(5.0) and H(depth)/H(5.0) at the specified depths, along the drill bit's longitudinal axial center line (C) if the drill bit has a length (L) of 10 mm or greater, and Ltot(depth)/Ltot(3.5) and H(depth)/H(3.5) at the specified depths, if the drill bit has a length (L) of 10 mm or less.

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

Rock drilling equipment and drill string components () for top hammer drilling and down-the-hole drilling for positioning between a drill rig and a drill bit include a pipe-shaped element (), which is arranged for transferring only rotational movements from the drill rig to the drill hit. A vibration-damping structure () is arranged adjoining to at least a part of an inside () of the pipe-shaped element in a space () formed inwardly of the inside ().

Drill string component for noise control during percussion drilling

Drill bit () for a rock drilling tool (), which drill bit () has a drilling surface () that contacts rock during drilling. A longitudinal cross section () of the drill bit () through the drilling surface () 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 () has en length (L) of 10 mm or greater, and a longitudinal cross section () of the drill bit () through the drilling surface () 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 () has en length (L) less than 10 mm.

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Fagersta, Sweden

Jimmy Carlsson