Patent ID: 11879352
Assignee: SAFRAN AIRCRAFT ENGINES
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 3:
4. A method for removing a fan disc alone from a module having a longitudinal axis of a turbomachine comprising a rotor and a stator, the rotor comprising the fan disc, a drum and an annular sealing part centered on the axis and secured to one another via a circular row of bolts each comprising a screw and a nut, each screw passing through a retaining member arranged inside the rotor, each retaining member having at least two opposing lugs arranged around a head of the screw and projecting with respect to the head, the stator being centered on the axis and surrounding the drum, the stator being longitudinally delimited by a compressor stator vanes assembly arranged opposite the fan disc, the compressor stator vanes assembly comprising an outer shell having a flange, by means of the tool according to claim 1, the method comprising chronologically the steps of:
a) removing two predetermined bolts hereinafter referred to as reference bolts so as to have two free orifices at the level of the rotor, the angular distance between the reference bolts being equal to the angular distance between the two holes of the plate;
b) positioning the module above the tool in a vertical position so that the longitudinal axis of the module is substantially vertical and substantially coaxial with the vertical axis of the tool, the fan disc then being vertically above the drum;
c) aligning one of the free orifices with the first visual marker so as to angularly orient the module with respect to the tool;
d) indexing the module with respect to the tool by introducing two indexing fingers from the outside of the module, each indexing finger passing through a free orifice of the rotor and then through one of the two holes of the plate;
e) abutting the heads of the screws on the pins of the plate, the drum then surrounding the plate;
f) abutting the flange of the compressor stator vanes assembly on the bearing surfaces of the three supports;
g) removing all the nuts from the bolts;
h) extracting in a controlled manner the fan disc alone via at least one extractor;
i) removing the fan disc alone.