Rotary tool, in particular a drill bit

Details Rotary tool, in particular a drill bit Rotary tool, in particular a drill bit

B - Operations, Transporting

23

B

B23B 51/06 (2006.01) B23B 51/02 (2006.01) B23Q 1/00 (2006.01) B23Q 11/12 (2006.01)

Patent

CA 2188011

A rotary tool is disclosed, in particular a drill bit, comprising a shaft with cutting edges at the cutting end and with coolant ducts running through the shaft in an essentially longitudinal direction and opening out at the front ends. Two parallel ducts form the loop of a closed coolant circulation system by having sealing units fitted at the outflow ends at the tip of the bit; these sealing units allow a connection to be established between the outflows to create a coolant loop, while being fitted on the inside so as to be fluid-tight. This arrangement allows dry operation of the drill bit.

L'invention concerne un outil concentrique, notamment un foret, qui comprend une tige (1) pourvue, à l'extrémité de travail, de tranchants (2), et des canaux (4, 5) servant à acheminer un liquide réfrigérant, qui débouchent aux extrémités avant et traversent la tige sensiblement dans le sens de la longueur (3). Deux canaux (4, 5) parallèles forment la boucle d'un système de circulation fermée d'un agent réfrigérant, du fait que leurs orifices terminaux (6, 8) situés côté pointe du foret sont pourvus d'obturateurs (13). Ces derniers permettent l'établissement d'une communication (rainure 17) entre les orifices terminaux pour former une boucle de circulation de l'agent réfrigérant, tout en étant cependant montés de manière à être étanches au liquide, en direction de l'extérieur. Ce foret permet par conséquent de travailler par voie sèche.

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