Roller drill or roller bit

E - Fixed Constructions – 21 – C

Patent

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Details

E21C 25/18 (2006.01)

Patent

CA 2699807

The invention relates to a roller drill for removing material, especially rocks, minerals, or the like, according to the undercutting principle. Said roller drill comprises a cutting edge (12) that is concentric to a central axis M and conically widens towards the face (11) of the roller drill (10), and a supporting element (15) which is arranged on the internal face of the cutting edge (12) and extends to the face (11) of the tool. In order to design a roller drill or a roller bit, the down time of which is shorter or the useful life of which is longer than in prior art, the cutting edge (12) is made of a harder material than the supporting element (15), and the supporting element (15) forms an annular web (22) which is conical at least on an external circumferential wall (20) and delimits a free space (21) on the face (11) of the drill/bit by means of the internal circumferential wall (23) thereof. The drill/bit can be autonomously resharpened as a result of the free space and the different material combination.

L'invention concerne un trépan à molettes pour l'enlèvement de matériaux tels que roches, minéraux ou analogues, selon le principe de contre-dépouille, comprenant une surface de coupe (12), concentrique autour d'un axe central (M), s'élargissant de manière conique vers la face avant (11) du trépan à molettes (10), et un élément support (15) qui est disposé à l'intérieur de la surface de coupe (12) et qui s'étend vers la face avant (11) de l'outil. En vue d'obtenir un trépan à molettes ayant une durée de vie ou une durée d'utilisation améliorée par rapport à l'état de la technique, l'invention est caractérisée en ce que la surface de coupe (12) est en un matériau plus dur que l'élément support (15), et en ce que l'élément support (15) forme une moulure annulaire (22) conique au moins sur une paroi périphérique externe (20) qui délimite, avec sa paroi périphérique interne (23) un espace libre (21) sur la face avant (11) de l'outil. Du fait de cet espace libre et du couplage de matériaux différents, l'outil peut être réaffûté indépendamment..

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