EP3959422B1 - Tool for removing a fan disc from a module - Google Patents

Description

Technical field of the invention

The present invention relates in particular to a tool for removing a single fan disc from a module and to a method for removing a single fan disc from a module by means of such a tool.

Technical background

A turbomachine, such as a turbofan engine, comprises, from upstream to downstream in the direction of gas flow, a fan, one or more compressor stages (low pressure then high pressure), a combustion chamber, a or several turbine stages (high pressure then low pressure) and an exhaust nozzle.

Such a turbomachine corresponds to the assembly of a plurality of modules mounted relative to each other. During a maintenance action, different modules are dismantled and transported to different stations in order to undergo various maintenance operations (replacement of wearing parts, replacement/repair of parts with defects, etc.) necessary for the delivery in service of the turbomachine.

In the remainder of the description, more particular attention will be paid to the “low pressure compressor module” hereinafter referred to as the “module”.

Such a module is defined along a longitudinal axis X and comprises a rotor and a stator independent of each other.

The rotor comprises in particular a fan disc, a drum and an annular sealing part centered on the X axis and fixed to each other via a circular row of bolts each comprising a screw and a nut. Each screw also passes through a retaining member arranged at inside the rotor. Each retaining member has at least two facing lugs disposed around a head of the screw and projecting relative thereto, this retaining member making it possible to hold the head of the corresponding screw in place when the screw is removed. associated nut which is located outside the rotor. The rotor also comprises several annular rows of vanes attached to the drum and arranged one behind the other, each row of vanes being more commonly referred to as a “moving wheel”.

The stator is centered on the X axis and surrounds the drum. The stator comprises several annular rectifiers interposed between the moving wheels. The first rectifier is associated with the fan so as to form stage no. 1, the following ones each being associated with a movable wheel so as to form the following stages. Each rectifier comprises an inner shroud and an outer shroud connected to one another by an annular row of vanes. The outer shrouds of all the rectifiers are clamped to each other.

The existing tools make it possible to dismantle the module as a whole according to a determined process in which the fan disk is one of the elements of the module deposited last. In other words, the removal of the fan disc cannot be done without carrying out a complete dismantling of the module. An example of an existing tool is disclosed in the document US2012151735 .

There is an increasing demand for maintenance operations relating solely to the fan disk, these maintenance operations requiring only the removal of the fan disk.

It is understood that the existing tools are not suitable in the case where it is necessary to remove only the fan disk. Indeed, as mentioned above, for such an operation, the operators are obliged to carry out a complete dismantling of the module, to the detriment of course of productivity.

The objective of the present invention is thus to propose, on the one hand, a tool for removing a fan disk alone from a module and, on the other hand, a method of removing a single fan disk from a module by means of such a tool, thus allowing a gain in productivity.

Summary of the invention

• un bâti comprenant des moyens d'appui au sol ;
• un plateau annulaire centré sur l'axe Z et solidaire du bâti, ce plateau comprenant des première et seconde rangées circulaires de pions ainsi que deux trous disposés autour de l'axe Z suivant un pas régulier, chacun des deux trous étant disposé entre les première et seconde rangées, chacun des pions étant configuré pour supporter la tête d'une vis de manière à ne pas dégrader les pattes des organes de retenue, chaque trou étant configuré pour recevoir un doigt d'indexage du module par rapport à l'outil ;
• au moins trois supports répartis de manière régulière autour de l'axe Z et solidaires du bâti, chaque support comprenant une surface d'appui, les surfaces d'appui étant coplanaires et étant configurées pour supporter la bride du redresseur du module, les trois supports étant verticalement situés au-dessous du plateau ;
• un premier repère visuel disposé sur le bâti et configuré pour orienter angulairement le module par rapport à l'outil.

The invention thus proposes a tool for removing a fan disc alone from a module with longitudinal axis X of a turbomachine comprising a rotor and a stator, the rotor comprising the fan disc, a drum and a sealing part ring centered on the X axis and fixed to each other via a circular row of bolts each comprising a screw and a nut, each screw passing through a retainer arranged inside the rotor, each retainer having at least two opposite lugs arranged around a head of the screw and projecting relative to the head, the stator being centered on the X axis and surrounding the drum, the stator being longitudinally delimited by a rectifier arranged opposite the disc of a fan, the rectifier comprising an outer shroud having a flange, the vertical Z axis tool comprising:

• a frame comprising ground support means;
• an annular plate centered on the Z axis and integral with the frame, this plate comprising first and second circular rows of pins as well as two holes arranged around the Z axis following a regular pitch, each of the two holes being arranged between the first and second rows, each of the pins being configured to support the head of a screw so as not to damage the lugs of the retaining members, each hole being configured to receive an indexing finger of the module relative to the tool;
• at least three supports distributed in a regular manner around the Z axis and integral with the frame, each support comprising a support surface, the support surfaces being coplanar and being configured to support the flange of the rectifier of the module, the three supports being located vertically below the top;
• a first visual cue disposed on the frame and configured to angularly orient the module with respect to the tool.

Such a tool makes it possible to remove the fan disk alone while retaining the rest of the assembled module. Thus, during a maintenance operation relating solely to the fan disk, such a tool allows a significant gain in productivity.

In addition, such a tool makes it possible to remove the fan disk alone without damaging the other components of the module, and in particular the retainers and the screws.

Such a tool can also be used for refitting the repaired fan disc (or fitting a new fan disc) onto the rest of the assembled module.

• le premier repère visuel se présente sous la forme d'une ligne verticale ;
• l'outil comprend un second repère visuel disposé sur le bâti et configuré pour déterminer une position verticale du module à partir de laquelle le module doit être indexé par rapport à l'outil ;
• le second repère visuel se présente sous la forme d'une ligne horizontale ;
• chacun des trois supports comprend un évidement configuré pour permettre le passage d'une rangée annulaire d'aubes rapportées sur le tambour.

The tool according to the invention may comprise one or more of the following characteristics and/or steps, taken separately from each other or in combination with each other:

• the first visual cue is in the form of a vertical line;
• the tool comprises a second visual cue disposed on the frame and configured to determine a vertical position of the module from which the module must be indexed relative to the tool;
• the second visual cue is in the form of a horizontal line;
• each of the three supports comprises a recess configured to allow the passage of an annular row of blades attached to the drum.

1. a) retirer deux boulons prédéterminés ci-après qualifiés de boulons de référence de manière à disposer de deux orifices libres au niveau du rotor, l'écart angulaire entre les boulons de référence étant égal à l'écart angulaire entre les deux trous du plateau ;
2. b) positionner le module au-dessus de l'outil en position verticale de sorte que l'axe longitudinal X du module soit sensiblement vertical et sensiblement coaxial avec l'axe vertical Z de l'outil, le disque de soufflante étant alors verticalement au-dessus du tambour ;
3. c) aligner un des orifices libres avec le premier repère visuel de manière à orienter angulairement le module par rapport à l'outil ;
4. d) indexer le module par rapport à l'outil en introduisant depuis l'extérieur du module deux doigts d'indexage, chaque doigt d'indexage traversant un orifice libre du rotor puis un trou du plateau ;
5. e) mettre en appui les têtes des vis sur les pions du plateau, le tambour entourant alors le plateau ;
6. f) mettre en appui la bride du redresseur sur les surfaces d'appui des trois supports ;
7. g) retirer l'ensemble des écrous des boulons ;
8. h) extraire de manière contrôlée le disque de soufflante seul via au moins un extracteur ;
9. i) déposer le disque de soufflante seul.

The present invention also relates to a method for removing a single fan disc from a module with longitudinal axis X of a turbomachine comprising a rotor and a stator, the rotor comprising the fan disc, a drum and a spare part. annular seal centered on the X axis and fixed to each other 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 the at least two facing lugs arranged around a head of the screw and projecting relative to the head, the stator being centered on the axis X and surrounding the drum, the stator being longitudinally delimited by a stator arranged opposite the fan disc, the stator comprising an outer shroud having a flange, at the means of the tool as described above, the method comprising chronologically the steps consisting in:

1. a) remove two predetermined bolts hereinafter referred to as reference bolts so as to have two free holes at the level of the rotor, the angular difference between the reference bolts being equal to the angular difference between the two holes of the plate;
2. b) positioning the module above the tool in a vertical position so that the longitudinal axis X of the module is substantially vertical and substantially coaxial with the vertical axis Z of the tool, the fan disc then being vertically drum top;
3. c) aligning one of the free orifices with the first visual cue so as to orient the module angularly with respect to the tool;
4. d) indexing the module with respect to the tool by introducing two indexing fingers from outside the module, each indexing finger passing through a free hole in the rotor then a hole in the plate;
5. e) resting the heads of the screws on the pins of the plate, the drum then surrounding the plate;
6. f) rest the rectifier flange on the bearing surfaces of the three supports;
7. g) remove all the nuts from the bolts;
8. h) extracting the fan disk alone in a controlled manner via at least one extractor;
9. i) remove the fan disc alone.

Such a method makes it possible to remove the fan disk alone, by means of the tool, while retaining the rest of the assembled module. Thus, during a maintenance operation relating solely to the fan disk, the implementation of such a method allows a significant gain in productivity.

In addition, such a method makes it possible to remove the fan disk alone without damaging the other components of the module, and in particular the retainers and the screws.

• le disque de soufflante est extrait lors de l'étape h) via trois extracteurs répartis de manière régulière autour de l'axe Z, l'extraction étant contrôlée en dévissant progressivement trois écrous d'extraction préalablement vissés sur trois vis situées chacune à proximité de l'un des trois extracteurs, et en insérant progressivement des cales autour des trois vis munies d'écrous d'extraction entre le disque de soufflante et le tambour, les écrous d'extraction et les cales étant dans un matériau non métallique ;
• l'étape h) comprend les sous-étapes consistant à :
  • h1) disposer chaque écrou d'extraction à une distance D d'une face supérieure d'un lobe correspondant du disque de soufflante, la face supérieure étant disposée en regard de l'écrou d'extraction ;
  • h2) actionner les trois extracteurs de sorte que chaque face supérieure soit en contact avec l'écrou d'extraction correspondant ;
  • h3) disposer une ou plusieurs cales présentant une hauteur totale H autour de chaque vis munie d'un écrou d'extraction entre le disque de soufflante et le tambour, la hauteur totale H étant égale à la distance D ;
• l'étape d) est réalisée lorsque la bride du redresseur se situe verticalement au niveau d'un second repère visuel disposé sur le bâti de l'outil ;
• le module est maintenu lors des étapes a) à f) via un premier outillage de manipulation sur lequel est positionné et maintenu le module, le premier outillage de manipulation comprenant au moins une paire de premiers tourillons opposés, chacun des premiers tourillons étant lié à une patte d'attache d'un système de levage ;
• le premier outillage de manipulation est configuré pour permettre de régler longitudinalement sur une plage prédéterminée le positionnement du rotor vis-à-vis du stator ou inversement ;
• le disque de soufflante est maintenu lors des étapes g) à i) via un second outillage de manipulation sur lequel est positionné et maintenu le disque de soufflante, le second outillage de manipulation comprenant au moins une paire de seconds tourillons opposés, chacun des seconds tourillons étant lié à une patte d'attache d'un système de levage.

The method according to the invention may comprise one or more of the following characteristics and/or steps, taken separately from each other or in combination with each other:

• the fan disc is extracted during step h) via three extractors evenly distributed around the Z axis, the extraction being controlled by progressively unscrewing three extraction nuts previously screwed onto three screws each located close to one of the three extractors, and by progressively inserting wedges around the three screws provided with extraction nuts between the fan disc and the drum, the extraction nuts and the wedges being in a non-metallic material;
• step h) comprises the sub-steps consisting of:
  • h1) placing each extraction nut at a distance D from an upper face of a corresponding lobe of the fan disk, the upper face being placed facing the extraction nut;
  • h2) operate the three extractors so that each upper face is in contact with the corresponding extraction nut;
  • h3) placing one or more shims having a total height H around each screw provided with an extraction nut between the fan disc and the drum, the total height H being equal to the distance D;
• step d) is carried out when the flange of the rectifier is located vertically at the level of a second visual marker arranged on the frame of the tool;
• the module is held during steps a) to f) via a first handling tool on which the module is positioned and held, the first handling tool comprising at least one pair of first opposed pins, each of the first pins being linked to a attachment bracket of a lifting system;
• the first manipulation tool is configured to make it possible to adjust longitudinally over a predetermined range the positioning of the rotor vis-à-vis the stator or vice versa;
• the fan disk is held during steps g) to i) via a second handling tool on which the fan disk is positioned and held, the second handling tool comprising at least a pair of opposed second journals, each of the second journals being attached to a bracket of a lifting system.

Brief description of figures

• [Fig.1] la figure 1 est une vue en écorché et en perspective illustrant le module dans un second état E2 ;
• [Fig.2] la figure 2 est une vue en demi-coupe axiale illustrant le module dans un premier état E1 ;
• [Fig.3] la figure 3 est une vue de détail de la figure 2 illustrant notamment l'assemblage d'un disque de soufflante, d'un tambour et d'une pièce d'étanchéité annulaire via des boulons ;
• [Fig.4] la figure 4 est une vue en perspective d'un outil pour déposer le disque de soufflante du module illustré sur les figures 1 à 3 ;
• [Fig.5] la figure 5 est une vue de détail de la figure 4 ;
• [Fig.6] la figure 6 est une vue en perspective du module positionné en position horizontale dans le cadre d'un procédé de dépose d'un disque de soufflante d'un module illustré sur les figures 1 à 3 au moyen d'un outil illustré sur les figures 4 et 5 ;
• [Fig.7] la figure 7 est une vue en perspective illustrant une étape consistant à retirer deux boulons de référence de manière à disposer de deux orifices libres ;
• [Fig.8] la figure 8 est une vue de détail de la figure 7 illustrant un orifice libre ;
• [Fig.9] la figure 9 est une vue en perspective illustrant une étape consistant à aligner un des orifices libres avec un premier repère visuel de l'outil ;
• [Fig.10] la figure 10 est une vue en perspective illustrant une étape consistant à indexer le module par rapport à l'outil ;
• [Fig.11] la figure 11 est une vue en demi-coupe axiale illustrant une étape consistant à mettre en appui des têtes de vis sur des pions d'un plateau de l'outil ;
• [Fig.12] la figure 12 est une vue en perspective illustrant une étape consistant à mettre en appui une bride d'un redresseur du module sur des surface d'appui de supports ;
• [Fig.13] la figure 13 est une vue en perspective illustrant une étape consistant à extraire de manière contrôlée le disque de soufflante ;
• [Fig.14] la figure 14 est une vue de détail de la figure 13 ;
• [Fig.15] la figure 15 est une vue en perspective illustrant une sous-étape consistant à disposer des écrous d'extraction sur des vis ;
• [Fig.16] la figure 16 est une vue en perspective illustrant une sous-étape consistant à actionner des extracteurs ;
• [Fig.17] la figure 17 est une vue en perspective illustrant une sous-étape consistant à intercaler une ou plusieurs cales ;
• [Fig.18] la figure 18 est une vue en perspective illustrant une étape consistant à déposer le disque de soufflante seul.

The invention will be better understood and other details, characteristics and advantages of the invention will appear more clearly on reading the following description given by way of non-limiting example and with reference to the appended drawings in which:

• [ Fig.1 ] there figure 1 is a cutaway and perspective view illustrating the module in a second state E2;
• [ Fig.2 ] there figure 2 is an axial half-section view illustrating the module in a first state E1;
• [ Fig.3 ] there picture 3 is a detail view of the picture 2 illustrating in particular the assembly of a fan disc, a drum and an annular sealing part via bolts;
• [ Fig.4 ] there figure 4 is a perspective view of a tool for removing the fan disk from the module shown on the figures 1 to 3 ;
• [ Fig.5 ] there figure 5 is a detail view of the figure 4 ;
• [ Fig.6 ] there figure 6 is a perspective view of the module positioned in a horizontal position as part of a method of removing a fan disk from a module illustrated in the figures 1 to 3 using a tool illustrated on the figure 4 And 5 ;
• [ Fig.7 ] there figure 7 is a perspective view illustrating a step consisting in removing two reference bolts so as to have two free holes;
• [ Fig.8 ] there figure 8 is a detail view of the figure 7 illustrating a free orifice;
• [ Fig.9 ] there figure 9 is a perspective view illustrating a step consisting in aligning one of the free orifices with a first visual mark of the tool;
• [ Fig.10 ] there figure 10 is a perspective view illustrating a step consisting in indexing the module with respect to the tool;
• [ Fig.11 ] there figure 11 is an axial half-sectional view illustrating a step consisting of resting the screw heads on the pins of a plate of the tool;
• [ Fig.12 ] there figure 12 is a perspective view illustrating a step consisting of resting a flange of a rectifier of the module on bearing surfaces of supports;
• [ Fig.13 ] there figure 13 is a perspective view illustrating a step consisting in extracting the fan disk in a controlled manner;
• [ Fig.14 ] there figure 14 is a detail view of the figure 13 ;
• [ Fig.15 ] there figure 15 is a perspective view illustrating a sub-step consisting of arranging extraction nuts on screws;
• [ Fig.16 ] there figure 16 is a perspective view illustrating a sub-step of operating extractors;
• [ Fig.17 ] there figure 17 is a perspective view illustrating a sub-step consisting of inserting one or more wedges;
• [ Fig.18 ] there figure 18 is a perspective view illustrating a step consisting of removing the fan disk alone.

Detailed description of the invention

On the figures 1 and 2 there is shown a module 1 (low pressure compressor module) of a turbomachine defined along a longitudinal axis X and comprising a rotor 2 and a stator 3 independent of each other, and in other words the rotor 2 and the stator 3 are not guided relative to each other via, for example, a bearing. The longitudinal axis X of module 1 is coinciding with the longitudinal axis of the turbomachine, when the module 1 is in place in the turbomachine.

In the present application, the terms "internal" and "external" associated with the various components of the module 1 are defined with respect to the longitudinal axis X.

More precisely, the rotor 2 comprises a fan disc 4, a drum 5 and an annular sealing piece 6 centered on the X axis and fixed to each other via a circular row of bolts 7 each comprising a screw 8 and a nut 9. Each screw 8 passes through a retaining member 10 disposed inside the rotor 2. Each retaining member 10 has at least two facing lugs 11 disposed around a head 12 of the screw 8 and projecting relative at head 12.

The stator 3 is centered on the axis X and surrounds the drum 5. The stator 3 is longitudinally delimited by a rectifier r4 arranged opposite the fan disc 4, the rectifier r4 comprising an outer shroud 14 having a flange 15.

According to the embodiment illustrated in the figures and in particular the figures 1 to 3 , the fan disc 4 is arranged upstream of the drum 5 and comprises a plurality of cells each intended to receive a fan blade (not included in the module 1). The fan disc 4 has a plurality of lobes 16 distributed in a regular manner around the axis X at its downstream end, these lobes 16 forming a flange. The fan disk 4 is partially shown in the picture 2 . The head 12 of each screw 8 is placed inside the rotor 2. The nut 9 of each bolt 7 is placed outside the rotor 2. Each screw 8 crosses successively, from the head 12 to the corresponding nut 9, a through hole made in the corresponding retainer 10, a through hole made in the sealing part 6, a through hole made in a flange of the drum 5 and a through hole made in a lobe 16 of the disc fan 4. The screws 8 here have a square head 12.

As shown on the picture 3 , each retaining member 10 is arranged longitudinally between the head 12 of the corresponding screw 8 and the sealing part 6. Each retaining member 10 comprises four lugs 11 facing two by two which surround the head 12 of the corresponding screw 8 , the lugs 11 projecting from the head 12. The retaining members 10 and the heads 12 of the screws 8 are arranged in a common circular groove 17 of the sealing part 6. A retaining member 10 makes it possible to maintain places the head 12 of the corresponding screw 8 (located inside the rotor 2) when removing the associated nut 9 (located outside the rotor 2). The sealing part 6 is also fitted onto a projection 18 of the fan disk 4 at its internal end and hooked onto a projection 19 of the drum 5 at its external end.

As shown on the figure 2 , the rotor 2 also comprises four annular rows of blades 20 attached to the drum 5 and arranged one behind the other, each row of blades 20 being more commonly referred to as a “moving wheel”. The four mobile wheels are respectively numbered, from upstream to downstream, wheel R2 (for wheel n°2) to wheel R5 (for wheel n°5), wheel R1 (for wheel n°1) being considered to be the fan .

According to the embodiment illustrated in the figures and in particular the picture 2 , the stator 3 comprises five annular rectifiers interposed between the moving wheels. The five rectifiers are numbered, from upstream to downstream, rectifier r1 (for rectifier n°1) to rectifier r5 (for rectifier n°5). The first rectifier r1 is associated with the fan so as to form stage n°1, the following ones being each associated with a wheel (wheels R2 to R5) so as to form the following stages (stage n°2 to stage n° 5). Each rectifier r1 to r5 comprises an inner shroud 13 and an outer shroud 14 connected to one another by an annular row of vanes 21. The vanes 21 are for example welded to the inner and outer shrouds 13, 14 so as to form a machine-welded assembly. The outer shrouds 14 of the set of rectifiers r1 to r5 are clamped to each other.

By convention, in the present application, the terms “upstream” and “downstream” are defined with respect to the direction of circulation of the gases in the module 1, the gases successively passing through the different stages.

There picture 2 illustrates the module 1 in a first state E1 corresponding to the module 1 as it is when it is received to undergo a maintenance operation.

There figure 1 illustrates the module 1 in a second state E2 in which the fifth rectifier r5 has been removed, the outer shroud 14 of the fourth rectifier r4 then having a free flange 15. The second state E2 here corresponds to the state in which the module is located 1 to remove the fan disc 4 alone.

A module 1 found in a third state E3 corresponds to a module 1 found in a second state E2 from which the fan disk 4 has been removed.

The fan disc 4 alone is removed (or removed) from a module 1 which is in a second state E2 by means of a tool 22.

• un bâti 23 comprenant des moyens d'appui au sol 24 ;
• un plateau 25 annulaire centré sur l'axe Z et solidaire du bâti 23, ce plateau 25 comprenant des première et seconde rangées 26a, 26b circulaires de pions 27 ainsi que deux trous 28 disposés autour de l'axe Z suivant un pas régulier, chacun des deux trous 28 étant disposé entre les première et seconde rangées 26a, 26b, chacun des pions 27 étant configuré pour supporter la tête 12 d'une vis 8 de manière à ne pas dégrader les pattes 11 des organes de retenue 10, chaque trou 28 étant configuré pour recevoir un doigt d'indexage 29 du module 1 par rapport à l'outil 22 ;
• au moins trois supports 30 répartis de manière régulière autour de l'axe Z et solidaires du bâti 23, chaque support 30 comprenant une surface d'appui 31, les surfaces d'appui 31 étant coplanaires et étant configurées pour supporter la bride 15 du redresseur r4 du module 1, les trois supports 30 étant verticalement situés au-dessous du plateau 25 ;
• un premier repère visuel 32 disposé sur le bâti 23 et configuré pour orienter angulairement le module 1 par rapport à l'outil 22.

According to the invention, the tool 22 is defined along a vertical axis Z and comprises:

• a frame 23 comprising ground support means 24;
• an annular plate 25 centered on the Z axis and secured to the frame 23, this plate 25 comprising first and second circular rows 26a, 26b of pins 27 as well as two holes 28 arranged around the Z axis following a regular pitch, each of the two holes 28 being arranged between the first and second rows 26a, 26b, each of the pins 27 being configured to support the head 12 of a screw 8 so as not to damage the lugs 11 of the retaining members 10, each hole 28 being configured to receive an indexing pin 29 of the module 1 with respect to the tool 22;
• at least three supports 30 distributed in a regular manner around the axis Z and integral with the frame 23, each support 30 comprising a support surface 31, the support surfaces 31 being coplanar and being configured to support the flange 15 of the rectifier r4 of module 1, the three supports 30 being located vertically below the plate 25;
• a first visual marker 32 placed on the frame 23 and configured to orient the module 1 angularly with respect to the tool 22.

In the present application, the terms “lower” and “upper” associated with the various components of the tool 22 are defined with respect to the vertical axis Z. In addition, in the present application, the terms “internal” and “external » Associated with the various components of the tool 22 are defined with respect to the vertical axis Z.

According to the embodiment illustrated in the figures and in particular the figure 4 And 5 , the frame 23 comprises a platform 33 on which the supports 30 rest and a shaft 34 on which the plate 25 rests. The platform 33 is flat, perpendicular to the axis Z and substantially triangular, each support 30 being arranged at the level of a projecting angular portion of the platform 33. The shaft 34 is centered on the Z axis and rises from the platform 33. The ground support means 24 here comprise three feet distributed evenly around the Z axis .

The plate 25 comprises an upper annular surface 35 delimited by two flanges 36, these flanges 36 being configured to hold the ends of the sealing part 6 during fitting of the repaired fan disc (or of a new fan disc ) on a module 1 located in a third state E3. The pins 27 of the first and second rows 26a, 26b are arranged on the upper surface 35. The first and second rows 26a, 26b have the same number of pins 27 (here ten pins) and are symmetrical with respect to the Z axis. The holes 28 are thus also symmetrical with respect to the Z axis. The pins 27 as well as the two holes 28 are arranged equidistant from the Z axis. The holes 28 are here blind holes lying at the level of the upper surface 35 The angular difference between the two holes 28 is equal to 180 degrees. The indexing fingers 29 have been represented on the figure 5 to indicate the location of the holes 28. The plate 25 comprises a thermal protection 37 at its internal surface, so as to protect plate 25 from heat when fitting the repaired fan disc (or a new fan disc). Indeed, to achieve the fitting, the sealing piece 6 is heated to a predetermined temperature.

The support surfaces 31 are located in the same plane perpendicular to the Z axis. Each support surface 31 is located at an upper end of the corresponding support 30. Each support surface 31 is in the form of a annular sector and is delimited on the outside by a border 38. The three supports are arranged with respect to the pins 27 so that the heads 12 bear before the flange 15 when the module 1 is placed in position on the tool 22. Each support 30 comprises a recess 39 oriented on the side of the vertical axis Z and configured to allow the passage of the fifth wheel R5, when positioning the module 1 on the tool 22. The supports 30 can be adjustable with respect to to the platform 33 in a direction perpendicular to the Z axis.

The first visual cue 32 is in the form of a vertical line 32 arranged on the periphery of the shaft 34 and the periphery of the plate 25, this vertical line 32 being configured to orient the module 1 angularly with respect to the tool 22. This first visual cue 32 can be obtained by applying one or more self-adhesive strips.

The tool 22 comprises a second visual cue 40 which is in the form of a horizontal line 40 arranged on the periphery of the shaft 34, this horizontal line 40 being configured to determine a vertical position of the module 1 from which the module 1 must be indexed with respect to tool 22. The horizontal line here intersects the vertical line. In the same way as the first visual cue 32, this second visual cue 40 can be obtained via the application of one or more self-adhesive strips. Advantageously, the plate 25 and the supports 30 are made of a non-metallic material, so as not to damage the module 1. The plate 25 and the supports 30 are for example made of ^Teflon® .

1. a) retirer deux boulons 7 prédéterminés ci-après qualifiés de boulons de référence de manière à disposer de deux orifices libres 41 au niveau du rotor 2, l'écart angulaire entre les boulons de référence étant égal à l'écart angulaire entre les deux trous 28 du plateau 25 ; (Figures 6 à 8)
2. b) positionner le module 1 au-dessus de l'outil 22 en position verticale de sorte que l'axe longitudinal X du module 1 soit sensiblement vertical et sensiblement coaxial avec l'axe vertical Z de l'outil 22, le disque de soufflante 4 étant alors verticalement au-dessus du tambour 5 ;
3. c) aligner un des orifices libres 41 avec le premier repère visuel 32 de manière à orienter angulairement le module 1 par rapport à l'outil 22 ; (Figure 9)
4. d) indexer le module 1 par rapport à l'outil 22 en introduisant depuis l'extérieur du module 1 deux doigts d'indexage 29, chaque doigt d'indexage 29 traversant un orifice libre 41 du rotor 2 puis un trou 28 du plateau 25 ; (Figure 10)
5. e) mettre en appui les têtes 12 des vis 8 sur les pions 27 du plateau 25, le tambour 5 entourant alors le plateau 25 ; (Figure 11)
6. f) mettre en appui la bride 15 du redresseur r4 sur les surfaces d'appui 31 des supports 30 ; (Figure 12)
7. g) retirer l'ensemble des écrous 9 des boulons 7 ;
8. h) extraire de manière contrôlée le disque de soufflante 4 seul via au moins un extracteur 42 ; (Figures 13 à 17)
9. i) déposer le disque de soufflante 4 seul. (Figure 18)

The removal (or removal) of a fan disc 4 alone from a module 1 located in a second state E2, by means of the tool 22, is carried out according to a method comprising chronologically the steps consisting in:

1. a) remove two predetermined bolts 7 hereinafter referred to as reference bolts so as to have two free holes 41 at the level of the rotor 2, the angular difference between the reference bolts being equal to the angular difference between the two holes 28 of tray 25; ( Figures 6 to 8 )
2. b) positioning the module 1 above the tool 22 in a vertical position so that the longitudinal axis X of the module 1 is substantially vertical and substantially coaxial with the vertical axis Z of the tool 22, the fan disk 4 then being vertically above the drum 5;
3. c) aligning one of the free orifices 41 with the first visual cue 32 so as to orient the module 1 angularly with respect to the tool 22; ( Picture 9 )
4. d) indexing the module 1 with respect to the tool 22 by introducing from outside the module 1 two indexing fingers 29, each indexing finger 29 passing through a free orifice 41 of the rotor 2 then a hole 28 of the plate 25 ; ( Picture 10 )
5. e) resting the heads 12 of the screws 8 on the pins 27 of the plate 25, the drum 5 then surrounding the plate 25; ( Picture 11 )
6. f) resting the flange 15 of the rectifier r4 on the bearing surfaces 31 of the supports 30; ( Picture 12 )
7. g) remove all the nuts 9 from the bolts 7;
8. h) extracting the fan disk 4 alone in a controlled manner via at least one extractor 42; ( Figures 13 to 17 )
9. i) remove the fan disc 4 alone. ( Picture 18 )

As mentioned above, the method is implemented on a module 1 which is in a second state E2, and in other words a module 1 from which the fifth rectifier r5 has been removed.

The module 1 is held during steps a) to f) via a first manipulation tool 43 on which the module 1 is positioned and held, the first handling tool 43 comprising at least one pair of first opposed journals 44, 45, each of the first journals 44, 45 being linked to an attachment bracket 46 of a lifting system 47.

According to the embodiment illustrated in the figures and in particular the figures 6 to 12 , the first handling tool 43 comprises a first part 48 able to be fixed to the rotor 2 of the module 1 and a second part 49 able to be fixed to the stator 3 of the module 1. The first handling tool 43 comprises adjustment means configured to adjust longitudinally over a predetermined range the positioning of the first part 48 (rotor 2) vis-à-vis the second part 49 (stator 3) or vice versa. As mentioned above, rotor 2 and stator 3 are independent of each other. This longitudinal adjustment is used in particular to guarantee that the heads 12 of the screws 8 bear before the flange 15 when the module 1 is placed in position on the tool 22. The first manipulation tool 43 comprises a pair of central pins 44 and a pair of end journals 45. Each of the pairs of journals 44, 45 is adapted to be attached to an independent lifting system 47. Each lifting system 47 comprises for example a lifting device (such as a winch) ( not shown), a lifter 50 and two attachment lugs 46.

Advantageously, as illustrated in the figures 6 to 8 , during step a), the module 1 is in a horizontal position so that the longitudinal axis X of the module 1 is substantially parallel to the ground on which the tool 22 rests. The first manipulation tool 43 is linked to a first lifting system 47 via the middle trunnions 44 and to a second lifting system 47 via the end trunnions 45.

As shown on the figures 6 to 8 , during step a), an operator removes the bolts 7 placed at 3 o'clock and 9 o'clock by analogy with the dial of a clock. The bolts 7 placed at 3 o'clock and 9 o'clock are thus considered to be the reference bolts. The angular difference between the two reference bolts is indeed equal to the angular difference between the two holes 28 of the plate 25, namely 180 degrees. At the end of step a), the free orifices 41 are then at 3 o'clock and 9 o'clock.

As shown on the figures 9 to 12 , during steps b) to f), the module 1 is in the vertical position, the fan disk 4 then being vertically above the drum 5. The first manipulation tool 43 is linked to a single lifting system 47 via the end trunnions 45.

As shown on the figure 9 , during step c), an operator checks the first manipulation tool 43 so as to align one of the free orifices 41 (identifiable via the absence of the nut) with the vertical line (first visual cue 32). This step c) aligns the two free holes 41 with the two holes 28 of the plate 25.

As shown on the figure 10 , step d) is performed when the free flange 15 of the rectifier r4 is located vertically at the level of the horizontal line (second visual cue 40). An operator then successively introduces, from outside the module 1, the two indexing fingers 29. Each indexing finger 29 passes through a free orifice 41 of the rotor 2 and a hole 28 of the plate 25.

As shown on the figure 11 , during step e), the module 1 is lowered so as to rest the heads 12 of the screws 8 on the pins 27 of the plate 25. It is essential to first rest the rotor 2 (the heads 12 of the screws 8) then in a second step the stator 3 (flange 15 of the rectifier r4) in order to avoid any unexpected movement of the rotor 2 during the removal of the first handling tool 43. During this step e), it is possible to use the adjustment means of the first manipulation tool 43 in order to move the rotor 2 longitudinally with respect to the stator 3 or vice versa.

As shown on the figure 12 , during step d), the flange 15 of the rectifier r4 is brought to rest on the bearing surfaces 31 of the supports 30. The recesses 39 allow the passage of the fifth wheel R5. During this step d), it is possible to adjust the supports 30 with respect to the platform 33.

The method comprises, between steps f) and g), a step f1) consisting in removing the first manipulation tool 43 from the module 1.

The fan disc 4 is held during steps g) to i) via a second handling tool 51 on which the fan disc 4 is positioned and held, the second handling tool 51 comprising at least a pair of second opposed journals 52 , each of the second trunnions 52 being linked to an attachment lug 46 of a lifting system 47. According to the embodiment illustrated in the figures and in particular the figures 13 to 18 , the second handling tool 51 comprises a first lifting element 53 and a second lifting element 54 adapted to be fixed to the fan disc 4. The first and second lifting elements 53, 54 are arranged symmetrically with respect to the X axis. Each of the lifting elements 53, 54 comprises a trunnion 52, the trunnions 52 being adapted to be attached to a lifting system 47. The lifting system 47 comprises for example a lifting device (such as a winch ) (not shown), a crossbar 50 and two attachment lugs 46.

As shown on the figures 13 to 17 , the fan disc 4 is extracted during step h) via three extractors 42 evenly distributed around the axis Z. Extraction is controlled by progressively unscrewing three extraction nuts 55 previously screwed onto three screws 8 each located close to one of the three extractors 42, and by progressively inserting wedges 56 around the three screws 8 fitted with extraction nuts 55 between the fan disc 4 and the drum 5, the extraction nuts 55 and the shims 56 being of a non-metallic material.

As shown on the figure 13 And 14 , each extractor 42 comprises a first arm 57 and a second arm 58 hinged relative to each other, the first arm 57 resting on the fan disc 4 and the second arm 58 resting on the part of annular seal 6. Each extractor 42 comprises a hydraulic actuator 59 articulated with respect to the first and second arms 57, 58, this hydraulic actuator 59 being configured to separate the first and second arms 57, 58 from each other and the other, and thus vertically extract the fan disc 4 alone from the sealing piece 6 on which it is fitted.

The wedges 56 make it possible to avoid any inclination of the fan disk 4 during a drop in hydraulic pressure at the level of the extractors 42.

Advantageously, the extraction nuts 55 and the wedges 56 are made of a non-metallic material, so as not to damage the screws 8. The extraction nuts 55 and the wedges 56 are for example made of ^Teflon® .

• h1) disposer chaque écrou d'extraction 55 à une distance D d'une face supérieure 60 d'un lobe correspondant 16 du disque de soufflante 4, la face supérieure 60 étant disposée en regard de l'écrou d'extraction 55 ; (Figure 15)
• h2) actionner les trois extracteurs 42 de sorte que chaque face supérieure 60 soit en contact avec l'écrou d'extraction 55 correspondant ; (Figure 16)
• h3) disposer une ou plusieurs cales 56 présentant une hauteur totale H autour de chaque vis 8 munie d'un écrou d'extraction 55 entre le disque de soufflante 4 et le tambour 5, la hauteur totale H étant égale à la distance D. (Figure 17)

As shown on the figures 15 to 17 , step h) chronologically comprises the sub-steps consisting of:

• h1) placing each extraction nut 55 at a distance D from an upper face 60 of a corresponding lobe 16 of the fan disc 4, the upper face 60 being placed facing the extraction nut 55; ( Picture 15 )
• h2) actuating the three extractors 42 so that each upper face 60 is in contact with the corresponding extraction nut 55; ( Picture 16 )
• h3) arrange one or more shims 56 having a total height H around each screw 8 provided with an extraction nut 55 between the fan disc 4 and the drum 5, the total height H being equal to the distance D. ( Picture 17 )

The sub-steps h1) to h3) are repeated so as to raise the fan disc 4 as much as possible relative to the drum 5. By way of example, the nut 9 is placed at a distance D=6 mm to start the extraction then the nut 9 is unscrewed by 3 mm at each repetition of steps h1) to h3) so that the fan disk 4 is 15 mm away from the drum 5 at the end of four cycles.

Such an extraction of the fan disc 4 makes it possible to obtain a vertical extraction and to prevent any contact between the screws 8 and the holes made in the lobes 16 of the fan disc 4.

As shown on the figures 13 to 18 , during steps h) and i), the screws 8 are still in place (except for the two reference screws).

At the end of steps a) to i), module 1 is in its third state E3. The refitting (or the positioning) of the repaired fan disc (or of a new fan disc) is carried out directly on the module 1 as it was following the aforementioned process, namely in its third state E3 and placed on the tool 22. The same tool 22 thus makes it possible to remove the fan disc 4 but also to refit it. When refitting, care must be taken to orient the repaired fan disc correctly by aligning a mark associated with the repaired fan disc (for example a notch) with the marks on the other components of module 1. When refitting the fan disc repaired, sealing part 6 of module 1 is heated to allow fitting of the repaired fan disc into sealing part 6 of module 1.

Claims (10)

1. A tool (22) for removing a fan disc (4) alone from a module (1) having a longitudinal axis (X) of a turbomachine comprising a rotor (2) and a stator (3), the rotor (2) comprising the fan disc (4), a drum (5) and an annular sealing part (6) centered on the axis (X) and secured to one another via a circular row of bolts (7) each comprising a screw (8) and a nut (9), each screw (8) passing through a retaining member (10) arranged inside the rotor (2), each retaining member (10) having at least two opposing lugs (11) arranged around a head (12) of the screw (8) and projecting with respect to the head (12), the stator (3) being centered on the axis (X) and surrounding the drum (5), the stator (3) being longitudinally delimited by a compressor stator vanes assembly (r4) arranged opposite the fan disc (4), the compressor stator vanes assembly (r4) comprising an outer shell (14) having a flange (15), the tool (22) having a vertical axis (Z) comprising:

   - a frame (23) comprising ground support means (24);

   - an annular plate (25) centered on the axis (Z) and secured to the frame (23), this plate (25) comprising first and second circular rows (26a, 26b) of pins (27) as well as two holes (28) arranged around the axis (Z) at a regular pitch, each of the two holes (28) being arranged between the first and second rows (26a, 26b), each of the pins (27) being configured to bear the head (12) of a screw (8) so as not to damage the lugs (11) of the retaining members (10), each hole (28) being configured to receive an indexing finger (29) of the module (1) relative to the tool (22);

   - at least three supports (30) distributed in a regular manner around the axis (Z) and secured to the frame (23), each support (30) comprising a bearing surface (31), the bearing surfaces (31) being coplanar and being configured to support the flange (15) of the compressor stator vanes assembly (r4) of the module (1), the three supports (30) being vertically located below the plate (25);

   - a first visual marker (32) arranged on the frame (23) and configured to angularly orient the module (1) relative to the tool (22).
2. The tool (22) according to claim 1, characterized in that the tool (22) comprises a second visual marker (40) arranged on the frame (23) and configured to determine a vertical position of the module (1) from which the module (1) is to be indexed relative to the tool (22).
3. The tool (22) according to one of the preceding claims, characterized in that each of the three supports (30) comprises a recess (39) configured to allow the passage of an annular row of vanes (20) fitted to the drum (5).
4. A method for removing a fan disc (4) alone from a module (1) having a longitudinal axis (X) of a turbomachine comprising a rotor (2) and a stator (3), the rotor (2) comprising the fan disc (4), a drum (5) and an annular sealing part (6) centered on the axis (X) and secured to one another via a circular row of bolts (7) each comprising a screw (8) and a nut (9), each screw (8) passing through a retaining member (10) arranged inside the rotor (2), each retaining member (10) having at least two opposing lugs (11) arranged around a head (12) of the screw (8) and projecting with respect to the head (12), the stator (3) being centered on the axis (X) and surrounding the drum (5), the stator (3) being longitudinally delimited by a compressor stator vanes assembly (r4) arranged opposite the fan disc (4), the compressor stator vanes assembly (r4) comprising an outer shell (14) having a flange (15), by means of the tool (22) according to one of claims 1 to 3, the method comprising chronologically the steps of:

   a) removing two predetermined bolts (7) hereinafter referred to as reference bolts so as to have two free orifices (41) at the level of the rotor (2), the angular distance between the reference bolts being equal to the angular distance between the two holes (28) of the plate (25);

   b) positioning the module (1) above the tool (22) in a vertical position so that the longitudinal axis (X) of the module (1) is substantially vertical and substantially coaxial with the vertical axis (Z) of the tool (22), the fan disc (4) then being vertically above the drum (5);

   c) aligning one of the free orifices (41) with the first visual marker (32) so as to angularly orient the module (1) with respect to the tool (22);

   d) indexing the module (1) with respect to the tool (22) by introducing two indexing fingers (29) from the outside of the module (1), each indexing finger (29) passing through a free orifice (41) of the rotor (2) and then through a hole (28) of the plate (25);

   e) abutting the heads (12) of the screws (8) on the pins (27) of the plate (25), the drum (5) then surrounding the plate (25);

   f) abutting the flange (15) of the compressor stator vanes assembly (r4) on the bearing surfaces (31) of the three supports (30);

   g) removing all the nuts (9) from the bolts (7);

   h) extracting in a controlled manner the fan disc (4) alone via at least one extractor (42);

   i) removing the fan disc (4) alone.
5. The method according to claim 4, characterized in that the fan disc (4) is extracted during the step h) via three extractors (42) distributed in a regular manner around the axis (Z), the extraction being controlled by progressively unscrewing three extraction nuts (55) previously screwed onto three screws (8) each located close to one of the three extractors (42) and by progressively inserting wedges (56) around the three screws (8) having the extraction nuts (55) between the fan disc (4) and the drum (5), the extraction nuts (55) and the wedges (56) being in a non-metallic material.
6. The method according to claim 5, characterized in that the step h) comprises the sub-steps of:

   h1) arranging each extraction nut (55) at a distance (D) from an upper face (60) of a corresponding lobe (16) of the fan disc (4), the upper face (60) being arranged opposite the extraction nut (55);

   h2) actuating the three extractors (42) so that each upper face (60) is in contact with the corresponding extraction nut (55);

   h3) arranging one or more wedges (56) having a total height (H) around each screw (8) having an extraction nut (55) between the fan disc (4) and the drum (5), the total height (H) being equal to the distance (D).
7. The method according to one of claims 4 to 6, characterized in that the step d) is carried out when the flange (15) of the compressor stator vanes assembly (r4) is located vertically at the level of a second visual marker (40) arranged on the frame (23) of the tool (22).
8. The method according to any of claims 4 to 7, characterized in that the module (1) is held during the steps a) to f) via a first handling tooling (43) on which the module (1) is positioned and held, the first handling tooling (43) comprising at least one pair of opposing first trunnions (44, 45), each of the first trunnions (44, 45) being linked to a bracket (46) of a lifting system (47).
9. The method according to claim 8, characterized in that the first handling tooling (43) is configured to allow the positioning of the rotor (2) relative to the stator (3) to be adjusted longitudinally over a predetermined range or vice versa.
10. The method according to any one of claims 4 to 9, characterized in that the fan disc (4) is held during the steps g) to i) via a second handling tooling (51) on which the fan disc (4) is positioned and held, the second handling tooling (51) comprising at least one pair of opposing second trunnions (52), each of the second trunnions (52) being linked to a bracket (46) of a lifting system (47).

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