公开(公告)号：US10124416B2

公开(公告)日：2018-11-13

申请号：US15348135

申请日：2016-11-10

Applicant: Airbus SAS

Inventor： Daniel Aliaga ,  Dominique Schuster ,  Fernand Vinhas ,  Guillaume Abrivard

IPC: B23B35/00 ,  B23B51/06 ,  B23B51/04 ,  B23Q11/10

Abstract: A drill bit having an interior canal for liquid nitrogen to pass longitudinally through the body of the drill bit. The canal has, on the side of a cutting edge of the drill bit, at least one liquid nitrogen ejection duct that opens near the cutting edge which is formed by an insert made with polycrystalline diamond fixed to the body of the drill bit. A device for drilling a metal-composite stack includes the drill bit, a liquid nitrogen production unit and a distribution network to distribute the liquid nitrogen. The device drills through a metal-composite stack in a single pass of the drill bit. The liquid nitrogen at cryogenic temperature is conveyed close to the cutting edge, at least while the cutting edge is in contact with the metallic material.