FR3145890A1 - SYSTEM FOR DISSOLVING NUCLEI IN COMPOSITE PARTS - Google Patents

Abstract

The invention relates to a system (6) for dissolving cores (58) in composite parts (50), the dissolution system (6) comprising: - a tank (60) filled with a liquid for dissolving cores (58), and - a carousel (62) located in the tank (60) and configured to carry composite parts (50) comprising cores (58) to be dissolved, the carousel (62) being rotatable about an axis (A) and the composite parts (50) being intended to be arranged about this axis (A) and immersed in said dissolution liquid. Abstract: Figure 6

Description

SYSTEM FOR DISSOLVING NUCLEI IN COMPOSITE PARTS Technical field of the invention

The invention relates to the field of systems for dissolving cores in composite parts.

The invention also relates to an installation comprising such a dissolution system and composite parts containing cores to be dissolved, as well as a method for dissolving cores in composite parts implemented using this installation.

Technical background

To produce a part, particularly in composite, with alveoli (or in other words cavities or hollow cells), it is known to use fusible or soluble cores.

The term "fusible core" or "soluble core" refers to a part (e.g. made of salt) on which a material, particularly a composite, is formed. This core is intended to disappear, for example by a dissolution system, to form one of the cells making up the final part.

For example, document WO-A1-2021123628 describes fusible or soluble cores for producing thrust reverser grids made of composite material for an aircraft turbomachine. To do this, the document describes judiciously placing a core corresponding to each cell of a reverser grid in a manufacturing mold, then thermocompression is carried out to form an intermediate part containing the cores. At the end of this thermocompression step, the cores therefore remain trapped in the intermediate part. After demolding this intermediate part, the cores must then be removed to obtain the desired final part with the cells.

It is known to immerse the molded intermediate part in a tank of water to eliminate the cores to be dissolved, particularly in salt. However, the melting of the core can be long and the water can quickly saturate in the tank. In addition, the quantity of water used in the tank, which can be greater than 100 liters, is significant. This water saturated with dissolved particles of cores is treated as chemical waste due to the presence of salt.

An oscillatory motion can be added in the tank to allow the mixing of water and accelerate the erosion of the salt. However, the time for the cores to melt can still be long.

The cores can also be removed by a pressurized water jet system. This reduces the time it takes to melt the cores, but the volume of water required to remove these cores is even greater.

In these different contexts, it is interesting to propose a solution to optimize the dissolution time of the cores and to reduce the volume of water and waste generated during the dissolution of these cores in composite parts.

The invention provides a simple, effective and economical solution to the aforementioned drawbacks of the prior art.

For this purpose, according to a first aspect, the invention relates to a system for dissolving cores in composite parts, the dissolution system comprising:
- a tank filled with a liquid for dissolving kernels, and
- a carousel located in the tank and configured to carry composite parts comprising cores to be dissolved, the carousel being movable in rotation around an axis A and the composite parts being intended to be arranged around this axis A and immersed in said dissolution liquid.

The dissolution system of the invention generally makes it possible to significantly reduce the dissolution time of the cores contained in the composite parts and to minimize both the volume of dissolution liquid required and the waste generated during dissolution.

Indeed, the rotation of the carousel generates centrifugal forces. These forces create currents of the dissolving liquid (or vortices) which erode the cores in the composite parts into several dissolved particles. These particles detach from the composite parts to form the cells of the final composite parts.

In addition, the rotation of the carousel also makes it possible to make the saturation of dissolved particles of nuclei in the tank homogeneous. Thus, the quantity of particles dissolved in the volume of the dissolution liquid of the tank is increased. In this way, the generation of waste is reduced, as is the volume of dissolution liquid required in the system of the invention.

The dissolution system according to the invention may comprise one or more of the following features, taken in isolation from one another or in combination with one another:

- the system also includes a settling tank which is located below the tank and which is configured to collect dissolved particles from the cores;

- the system comprises at least one filter located between the tank and the settling tank and configured to retain dissolved particles of nuclei in the settling tank;

- the tank further comprises one or more channels configured to convey dissolved core particles from the tank to the settling tank;

- the system comprises a pump filtration device comprising a reservoir for collecting dissolved particles from the cores, a first tube and a second tube connected to the tank, the first tube forming an inlet for the dissolution liquid and the second tube forming an outlet for the dissolution liquid with the dissolved particles towards the reservoir;

- the carousel comprises at least one fin configured to be interposed between two adjacent composite parts and configured to stir the dissolution liquid;

- the system includes a device for heating the dissolution liquid;

- the carousel comprises a turntable and a central column which extends from the turntable upwards along the axis A, longitudinal grooves for fixing the composite parts being provided in the central column;

- the turntable comprises at its external periphery an annular rim oriented towards the side of said central column;

- the system comprises a retention device which is fixed on an upper end of the central column and which is configured to cover said composite parts;

- the dissolving liquid is water or water-based.

The invention also relates, according to a second aspect, to an installation comprising a core dissolution system according to one of the particularities of the invention, and composite parts, in particular aeronautical parts, carried by the carousel and arranged around the axis A.

The installation according to the invention may comprise one or more of the following characteristics, taken in isolation from one another or in combination with one another:

- the composite parts are flat and each extend substantially in a radial plane relative to the axis A;

- the composite parts are grids, such as thrust reverser grids of an aircraft turbomachine, these grids comprising cells filled with the cores to be dissolved;

- the cores are based on salt(s), for example comprising a mixture of sodium nitrate, potassium nitrate and zirconium silicate;

dissolution for the purpose of dissolving the nuclei

The invention finally relates, according to a third aspect, to a method for dissolving cores in composite parts, this method being implemented using an installation according to one of the particularities of the inventions. This method comprises a step of rotating the carousel and the composite parts in the dissolution liquid with a view to dissolving the cores.

Brief description of the figures

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

there is a schematic perspective view of a nacelle of an aircraft propulsion unit comprising a thrust reverser having a plurality of composite parts in the form of a grid according to the invention,

there is a partial schematic and perspective view of an example of the composite part of the ,

there represents a flowchart of a manufacturing process of the composite part of the ,

there illustrates in perspective and schematically a sheet with long discontinuous fibers of a first fibrous reinforcement according to the invention,

there is a schematic representation of a step of assembling the spar and blade preforms of the manufacturing process of the ,

there is a schematic and perspective view of an installation according to an embodiment of the invention, comprising a core dissolution system and composite parts of the ,

there is a schematic and axial sectional view of the installation of the ,

there is a schematic and perspective view of an installation according to another embodiment of the invention, comprising the core dissolution system, composite parts of the and fins,

there is a schematic and perspective view of an installation according to another embodiment of the invention, comprising a core dissolution system, an external filtration device and composite parts of the ,

there is a schematic and perspective view of a retention device for the dissolution system of the invention, and

there is a flowchart of a process for dissolving nuclei in composite parts.

Elements having the same functions in different embodiments have the same references in the figures.

Detailed description of the invention

By convention, in the description below, the terms "longitudinal" and "axial" qualify the orientation of structural elements extending in the direction of a longitudinal axis (such as a turbomachine). The terms "radial" or "vertical" qualify an orientation of structural elements extending in a direction perpendicular to the longitudinal axis. The terms "inner" and "outer", and "internal" and "external" are used in reference to a positioning relative to the longitudinal axis. Thus, a structural element extending along the longitudinal axis has an inner face facing the longitudinal axis and an outer surface, opposite its inner surface.

Similarly, by convention in this application, the terms “upstream” and “downstream” are defined in relation to the direction of circulation of gases in the turbomachine of an aircraft propulsion unit.

The invention applies in a non-limiting manner to an aircraft propulsion unit 10. The this aircraft propulsion unit 10 comprising a turbomachine 3 which is surrounded by a nacelle 1.

The propulsion unit 10 can be suspended from a fixed structure of an aircraft, for example under a wing or on a fuselage, by means of a pylon 2 (or mast) attached to the turbomachine 3 or to the nacelle 1 in the case of the example of the .

The turbomachine 3 may be a dual-flow turbomachine which comprises, from upstream to downstream (depending on the direction of gas flow), a fan, one or more compressor(s), a combustion chamber, one or more turbine(s), which define a flow vein of a primary flow (called hot air flow).

The nacelle 1 can extend along a longitudinal axis X.

The nacelle 1 may comprise, from upstream to downstream, an upstream air inlet section 4, a middle section (not visible on the ), a downstream section housing a thrust reverser 5 and possibly a terminal nozzle section. The sections of the nacelle 1 are connected together so as to extend around the turbomachine 3 and define around it an annular flow vein for a secondary air flow (or cold air flow).

The thrust reverser 5 may comprise a plurality of grilles 50 making it possible to form a member for deflecting an air flow (in particular that of the cold air flow). These grilles 50 may be connected in a movably manner with an external cover 52 of the thrust reverser. The grilles 50 may be pivotally mounted between a closed position (direct jet) in which these grilles 50 are substantially parallel to the axis X, and an open position (reverse jet) in which these grilles 50 are inclined relative to the axis X. illustrates the thrust reverser 5 in the open position so as to reveal the grids 50.

The nacelle 1 may comprise various parts and/or organs that may be made of composite materials. In particular, the grids 50 of the thrust reverser 5 may each be made of composite material. Of course, the invention applies generally to all parts made of composite material having cells (or in other words, cavities or hollow cells) and in various fields in which these parts allow a transmission of forces, a reduction in mass while being economical.

There illustrates a part made of composite material 50, in particular aeronautical. The composite part 50 can form one of the grids 50 described above and can therefore be intended to be assembled in the thrust reverser 5 of the nacelle 1.

The composite part 50 may comprise a fibrous reinforcement embedded in a matrix. In particular, the composite part 50 comprises cells 52 which can form a cell structure. Each cell 52 is delimited by several walls 54, 56 forming a parallelepiped in the example of the . The cells 52 can however have cross sections with other shapes such as hexagonal, circular, triangular. As we can see on the , the walls 54, 56 also make it possible to separate the cells 52 from each other.

Composite part 50 of the allows in particular to produce thrust reverser grids 5 which are intended to be installed in the thrust reverser 5 of the nacelle 1. In the case of the thrust reverser grids 5, the composite part 50 may comprise first walls 54 forming spars which fulfill the support function and second walls 56 forming bladed elements (also referred to as vanes) which contribute to directing an air flow in the turbomachine. The spars and the bladed elements extend longitudinally, respectively, in two substantially perpendicular directions and therefore form the contours of the cells 52. Thus, the first walls 54 extend along the X axis (of the nacelle 1) and the second walls 56 extend along a Y axis perpendicular to the X axis.

The composite part 50 as described above may be a thermoplastic, thermosetting, carbon fiber or glass fiber composite. The thermoplastic composite part 50 may be a material selected from polyetherimide (PEI), polyaryletherketones (PAEK), polyphenylene sulfide (PPS), polycarbonate (PC), etc. The thermosetting composite part 50 may be an 8552 or PR520 epoxy resin. The composite part 50 may be made of draped, laminated or long discontinuous fiber materials.

In particular, this composite part may be composed of a first fibrous reinforcement with discontinuous long fibers and/or a second fibrous reinforcement with continuous long fibers. The fibrous reinforcements are intended to provide strength to the final part 50 obtained in particular at the walls or junctions of the part. The cells 52 of the part are obtained by cores 58 around which the fibrous reinforcements are placed. The fibrous reinforcements are densified by a matrix (for example a thermoplastic or thermosetting matrix) to obtain the rigid final part with the cells 52 (whose respective shapes are obtained by the cores 58).

We will now describe an example of a manufacturing method 100 of such a composite part 50 with reference to and in a non-limiting manner to the thrust reverser grids 5. This method 100 is shown in the .

The method 100 may comprise a step 102 of providing a preform of bladed elements 560. This preform of bladed elements 560 may be obtained from a first sheet 500 of the first fibrous reinforcement as shown in the . The first web 500 may comprise a plurality of long discontinuous fibers that are randomly oriented, in all directions, in a plane. The long discontinuous fibers are known by the English acronym “DLF” for “Discontinuous Long Fiber”. The DLF web 500 comprises in particular the fibers and a matrix. In particular, the fibers are pre-impregnated for example with a thermoplastic or thermosetting resin.

The method 100 may comprise a step 104 of providing a spar preform 540. This spar preform 540 may be obtained from a second sheet of the second fibrous reinforcement. This second sheet may be made of continuous long fibers and may be obtained by weaving. This second sheet may also be laminated (i.e. formed by a stack of layers). In particular, the second sheet also comprises fibers and a matrix. The fibers may be pre-impregnated, for example, with a thermoplastic or thermosetting resin.

The method 100 may comprise a step 106 of assembling the spar preforms 540 and bladed elements 560 in a mold. With reference to the , a first spar preform 540 is positioned, then a first row of bladed element preforms 560 is positioned by alternating the placement of bladed element preforms 560 and cores 58 (for example made of salt). Then, a second spar preform 540 (not shown in the ) is positioned parallel to the first spar preform 540, then a second row of bladed element preforms 560 is positioned by alternating the placement of bladed element preforms 560 and cores 58. These operations can be repeated as many times as necessary to be able to form all of the desired cells 52 of the composite part 50.

The method 100 may comprise a step 108 of thermocompression of the spar preforms 540 and bladed elements 560 against the cores 58. This step 108 may be carried out in an autoclave or a press tool, in which the assembly is brought to a temperature and pressure to compress the preforms 540, 560 by the cores 58 and form the future walls 54, 56 of the composite part 50.

The method 100 may comprise a step 110 of demolding the composite part 50 in which the cores 58 remain trapped between the walls 54, 56.

As described above, after the demolding step 110, the cores 58 must then be removed to obtain the desired final composite part 50 with the cells 52.

The cores 58 may be based on salt(s). For example, the cores 58 may each comprise a mixture of sodium nitrate, potassium nitrate and zirconium silicate. The cores 58 are preferably soluble, for example in water or based on water as the dissolving liquid L.

The invention thus proposes a dissolution system 6 of cores 58 in composite parts 20. The dissolution system 6 will now be described with reference to FIGS. 6 to 10.

The dissolution system 6 includes:
- a tank 60 filled with a dissolution liquid L of cores 58, and
- a carousel 62 located in the tank 60 and mobile in rotation around an axis A.

With reference to FIGS. 6 to 10, the tank 60 may be cylindrical in shape. The tank 60 may be considered as a static element of the dissolution system 6. The tank 60 may be configured to receive the composite parts 50 with the cores 58 to be dissolved.

The carousel 62 is configured to carry the composite parts 50 with the cores 58 to be dissolved. The composite parts 50 are configured to be arranged around this axis A and immersed in the dissolution liquid L.

The dissolution liquid L may be water, water-based or any other liquid allowing dissolution of nuclei 58, for example based on salt(s).

The carousel 62 may comprise a turntable 620 and a central column 622. The central column 622 extends from the turntable 620 upwardly along the axis A. The turntable 620 and the central column 622 are thus configured to be rotatable about the axis A. The direction of rotation is indicated by an arrow on the . The turntable 620 and the central column 622 can be monobloc (i.e. made from one material).

The turntable 620 may be of planar shape and may be of annular shape. The turntable 620 may extend along an axis B perpendicular to the axis A. The turntable 620 may comprise an external periphery 620a (relative to the axis A). This external periphery 620a may comprise a first annular rim 621 (relative to the axis A). The first annular rim 621 may be oriented towards the central column 622. The first annular rim 621 may extend in radial projection relative to the external periphery 620a. This first annular rim 621 makes it possible to form a lateral stop for the composite parts 50 rotating in the carousel 62. The first annular rim 621 thus makes it possible to counteract centrifugal forces created in the tank 60 during the dissolution of the cores 58.

The rotating plate 60 may also comprise an internal annular portion 620b (relative to the axis A) which is in particular integral with the central column 622. This internal annular portion 620b and the central column 622 may be in one piece. The internal annular portion 620b, the central column 622 and the first annular rim 621 may be in one piece.

In reference to the , the central column 622 may comprise an upper portion 622a and a lower portion 622b. The upper portion 622a and lower portion 622b may be connected to each other by the turntable 620. The upper portion 622a and the turntable 620 may be located in the tank 60 and the lower portion 622b may be disposed in a settling tank 64 of the dissolution system 6, as illustrated in FIG. .

The central column 622 may comprise longitudinal grooves 624 which extend along the axis A. These longitudinal grooves 624 are configured to attach to the composite parts 50 and/or to one or more fins 626.

The carousel 62 may include at least one fin 626. The fin 626 may have a planar shape (as shown in the ) and may extend along a plane parallel to the axis A (or in other words a radial plane relative to the axis A). The fin 626 may have a length (measured relative to the axis B) identical to or less than that of the composite part 50. The fin 626 may be fixed in one of the longitudinal grooves 624 or be formed in a single piece with the central column 622 (in particular with the upper portion 622a of the central column 622).

The fin 626 is configured to be interposed between two adjacent composite parts 50. In this way, the fin 626 makes it possible to stir the dissolution liquid L. This stirring makes it possible to create convection movements of the dissolution liquid L and generate more vortices in the tank 60 and therefore promote the dissolution of the nuclei 58.

The dissolution system 6 may comprise the settling tank 64 which is located under the tank 60. This settling tank 64 is configured to collect dissolved particles P from the cores 58. In this way, the saturation of dissolved particles P in the tank 60 is reduced. For this, the tank 60 may comprise one or more openings 600 located for example in a bottom of the tank 60. This opening 600 makes it possible to discharge the dissolved particles P into the settling tank 64. The settling tank 64 may be cylindrical in shape. The central column 622, in particular the lower portion 622b, may be arranged in the settling tank 64, as illustrated in the .

The dissolution system 6 may comprise one or more channels 68 configured to convey the dissolved particles P from the tank 60 to the settling tank 64. As an example, these channels 68 may be arranged in one of the side walls 602 of the tank 60 as illustrated in the . <

The dissolution system 6 may comprise at least one filter 66. This filter 66 may be located between the tank 60 and the settling tank 64. The filter 66 may be located on a mesh portion 660 between the tank 60 and the settling tank 64. In particular, the mesh portion 660 is connected to the lower portion 622b of the central column 622 to be preferably arranged in the settling tank 64. On the , the filter 66 and the mesh portion 660 extend along a plane parallel to the axis B. The filter 66 (and consequently the mesh portion) is configured to retain the dissolved particles P in the settling tank 64.

As a variant of the filter 66, the dissolution system 6 may comprise a pump filtration device 67. In particular, this device 67 is external to the tank 62. In this configuration, the settling tank 64 may be optional. With reference to the , the pump filtration device 67 may comprise a reservoir 670 and two tubes, respectively, first 672 and second 674, connected to the tank 60. The first tube 672 makes it possible to form an inlet for the dissolution liquid L in the tank 60 and the second tube 674 makes it possible to form an outlet for the dissolution liquid L from the tank 60 to the reservoir 670 to collect the dissolved particles P. The pump filtration device 67 makes it possible to ensure the movement of the dissolution liquid L and thus to filter the dissolved particles P. The external filtration device 67 has the advantage of being easily adaptable to the dissolution system 6 of the invention and that it can be easily disconnected from the dissolution system 6 (for example to clean it in the event of saturation of the dissolved particles).

The dissolution system 6 may comprise a heating device 7 for heating the dissolution liquid L for its evaporation, for example after complete dissolution of the cores 58 of the composite part 50. For this, the heating device 7 may be electric with electrical resistors for heating the dissolution liquid L. Alternatively, the heating device 7 may be by induction or by heat transfer fluid.

The dissolution system 6 may comprise a retention device 8 configured to envelop and retain, for example, the composite parts 50. An example of a retention device 8 is illustrated in FIG. , in which the retention device 8 comprises an annular plate 82 and a central end piece 84 secured to this annular plate 82. The central end piece 84 can pass through the axis A. The central end piece 84 can be fixed to the central column 622, for example at an upper end 623 of the upper portion 622a. The annular plate 82 may have a planar shape and extend along a plane parallel to the axis B. The annular plate 82 may cover the composite parts 50 and/or at least one fin 626. The retention device 8 may also comprise a second annular rim 86 (relative to the axis A), for example at an external periphery 80 of the annular plate 82. This second annular rim 86 may be oriented towards the central column 622. The second annular rim 86 may extend in radial projection from an external annular end 820 (relative to the axis A) of the annular plate 82. The annular plate 82, the central end piece 84 and the second annular rim 86 may be in one piece.

The invention also relates to an installation I comprising the dissolution system 6 described with reference to to 10, and the composite parts 50 containing the cores 58 to be dissolved. This installation I is notably illustrated in figures 6 to 9.

The composite parts 50, in particular aeronautical parts, may be grids, for example thrust reverser grids 5 described with reference to FIGS. 2 to 5.

The composite parts 50 may be planar and may each extend substantially in a radial plane relative to the axis A.

In the installation I, the composite parts 50 are carried by the carousel 62 and arranged around the axis A. In particular, the composite parts 50 are fixed in the longitudinal grooves 624. The composite parts 50 can be retained by the first annular rim 621 and/or the second annular rim 86.

Installation I may also include one or more fins 626 inserted between two successive composite parts 50.

The composite parts 50 and/or the fin 626 arranged around the axis A can be movable in rotation around the axis A.

We will now describe a method 200 for dissolving cores 58 in composite parts 50. This method 200 can be implemented using the installation I described above. The method 200 is illustrated in FIG. and also indicated on the at the end of the manufacturing process 100 since the process 200 can be carried out after step 110.

The method 200 may comprise a step 202 of rotating the carousel 62 and the composite parts 50 (and/or the fin 226) in the dissolution liquid L to enable the dissolution of the cores 58. As an example, the rotation speed of the carousel 62 may be between 10 revolutions per minute and 60 revolutions per minute.

The method 200 may comprise a step 204 of heating the dissolution liquid L. The dissolution liquid L may be heated, for example by the heating system 7, to a predetermined temperature. This predetermined heating temperature may be at most 100°C. For example, the predetermined heating temperature is 70°C.

This step 204 can be carried out after complete dissolution of the cores 50 of the composite parts 50. This notably allows the evaporation of the dissolution liquid L at the end of the dissolution process 200. The dissolution system 6 can thus be used again for other composite parts 50 with cores 58 to be dissolved.

Claims (16)

Dissolving system (6) of cores (58) in composite parts (50), the dissolving system (6) comprising:
- a tank (60) filled with a dissolution liquid (L) of cores (58), and
– a carousel (62) located in the tank (60) and configured to carry composite parts (50) comprising cores (58) to be dissolved, the carousel (62) being movable in rotation about an axis (A) and the composite parts (50) being intended to be arranged around this axis (A) and immersed in said dissolution liquid (L). Dissolution system according to claim 1, characterized in that it also comprises a settling tank (64) which is located under the tank (60) and which is configured to collect dissolved particles (P) from the cores (58). Dissolution system according to claim 2, characterized in that it comprises at least one filter (66) located between the tank (60) and the settling tank (64) and configured to retain dissolved particles (P) of nuclei in the settling tank (64). A dissolution system according to claim 2 or 3, characterized in that the tank (60) further comprises one or more channels (68) configured to convey dissolved particles (P) of nuclei from the tank (60) to the settling tank (64). Dissolution system according to claim 1, characterized in that it comprises a pump filtration device (67) comprising a reservoir (670) for collecting dissolved particles (P) from the cores (58), a first tube and a second tube connected to the tank (60), the first tube (672) forming an inlet for the dissolution liquid (L) and the second tube (674) forming an outlet for the dissolution liquid (L) with the dissolved particles (P) towards the reservoir (670). Dissolution system according to any one of the preceding claims, characterized in that the carousel (62) comprises at least one fin (626) configured to be interposed between two adjacent composite parts (50) and configured to stir the dissolution liquid (L). Dissolution system according to any one of the preceding claims, characterized in that it comprises a heating device (7) for the dissolution liquid (L). Dissolution system according to any one of the preceding claims, characterized in that the carousel (62) comprises a rotating plate (620) and a central column (622) which extends from the rotating plate (620) upwards along the axis (A), longitudinal grooves (624) for fixing the composite parts (50) being provided in the central column (622). Dissolution system according to the preceding claim, characterized in that the rotating plate (620) comprises at its external periphery an annular rim (621) oriented towards the side of said central column (622). Dissolution system according to claim 8 or 9, characterized in that it comprises a retention device (8) which is fixed on an upper end (623) of the central column (622) and which is configured to cover said composite parts (50). Dissolution system according to any one of the preceding claims, characterized in that the dissolution liquid (L) is water or water-based. Installation (I) comprising a dissolution system (6) of cores (5) according to any one of the preceding claims and composite parts (50), in particular aeronautical parts, carried by the carousel (62) and arranged around the axis (A). Installation according to the preceding claim, characterized in that the composite parts (50) are flat and each extend substantially in a radial plane relative to the axis (A). Installation according to claim 12 or 13, characterized in that the composite parts (50) are grids, such as thrust reverser grids (5) of an aircraft turbomachine (10), these grids comprising cells (52) filled with the cores (58) to be dissolved. Installation according to any one of claims 12 to 14, characterized in that the cores (58) are based on salt(s), for example comprising a mixture of sodium nitrate, potassium nitrate and zirconium silicate. Method for dissolving cores (58) in composite parts (50), this method being implemented using an installation (I) according to any one of claims 12 to 15, this method comprising a step of rotating the carousel (62) and the composite parts (50) in the dissolution liquid (L) with a view to dissolving the cores.