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

Claim 0:
1. A cold expansion device for work hardening a through bore of a first determined length formed in a turbine engine part, in particular a helicopter engine injection wheel, comprising at least one chuck supporting a burnisher and a pushing means for axially pushing said chuck, wherein the device comprises at least:
a tubular guide, surrounding the chuck and the burnisher, and configured to guide the burnisher to the bore according to a collision stroke,
a first magnetic attachment means arranged at a free end of the chuck,
the burnisher, of a second determined length, comprising a free end comprising a work surface and an opposite end comprising a second magnetic attachment means, complementary to the first magnetic attachment means,
wherein the pushing means is movable by a stroke at least greater than a sum of the collision stroke, the first length of the bore, and the second length of the burnisher.