Patent ID: 11878390
Assignee: SAFRAN HELICOPTER ENGINES
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 9:
10. A cold expansion method for work hardening at least one through bore formed in a turbine engine part, such as a helicopter engine injection wheel, using a device according to claim 1, wherein it comprises:
a first step during which the chuck is extended from the guide,
a second step during which the burnisher of a size adapted to the bore to be work-hardened is fixed to the end of the chuck,
a third step during which the chuck and the burnisher are retracted into the guide,
a fourth step in which the burnisher is aligned with the bore,
a fifth step during which the pushing means is actuated to push the burnisher by means of the chuck through the through bore from a first side, by work hardening said bore until the burnisher comes out on a second side opposite to the first side,
a sixth step during which the stroke of the chuck is stopped and the burnisher is removed from the chuck,
a seventh step in which the chuck is retracted through the bore.