geometry of the superposition surface

Abstract

The present invention relates to a method for determining the stacking geometry of an article for producing a composite material (4), said article of composite material comprising a main body (1) and a flange (2), the main body being a revolution volume having an axis (A) oriented in an axial direction (D A ) and having a given reference radius (R R1 , R R2 , R R3 ), the main body (1) extending in a circumferential direction (D C ) around the axial direction (D A ), the flange (2) extending from one end of the main body (1) in an extension direction (D E ), the method comprising: determining a first surface (100) having a radius (R C1 , R C2 , R C3 ) smaller than the reference radius (R R1 , R R2 , R R3 ); and determining a second surface (200) positioned so as to continue the first surface (100), the second surface having a circumferential undulating curve (21, 22, 23, 24, 25) in the circumferential direction (D C ) and in the continuation direction (D P ).

Description

TECHNICAL FIELD

[0001] The present invention relates to the manufacture of composite parts by draping on a surface. In particular, but not exclusively, the present invention relates to the manufacture of aeroengine casings. BACKGROUND

[0002] The use of composites for the manufacture of aeronautical parts, such as aeroengine casings, makes it possible to obtain durable parts with mechanical properties comparable to, or even higher than, those of parts made of metal, while being much lighter.

[0003] It is known to produce composite parts by draping on a surface a pre-impregnated fibrous structure. For reasons of production cost and repeatability, the draping can be performed automatically, according to an automatic fibre placement (AFP) technique. An example of a method for manufacturing a composite part using an "AFP" process is described, for example, in document FR3062336B1.

[0004] However, when it is necessary to produce a part comprising a partially revolved body, the flange extending at its end(s), the angle between the body and the at least one flange being limited, in particular an acute angle of 90° or less, the head or roller used to deposit the fibrous structure does not allow access to the bottom of said angle.

[0005] Thus, in order to produce a part having such an angle, the draping is performed at a greater amplitude angle to allow the deposition head or roller to pass, then the structure resulting from the draping is deformed to obtain the desired angle. Such solutions are described, for example, in documents WO 2018 / 007756 and WO 2012 / 046020.

[0006] In document WO 2018 / 007756, in order to produce a final part comprising a flange and a half-shell shaped body having a given final radius, a half-shell shaped intermediate preform having a smaller radius than the final radius to be obtained is first draped, whereby the angle between the body and the flange is greater, which makes it possible to perform the draping of said angle. When the draping is complete, the intermediate preform thus obtained is deformed at the desired final radius, thereby deforming the flange to obtain the desired angle between the flange and the body.

[0007] In document WO 2012 / 046020, a part comprising a cylindrical body and a circular flange extending perpendicularly to the cylindrical body is produced. The draping is performed by draping the portion intended to form the flange by extending the portion intended to form the cylindrical body. Then, the portion intended to form the flange is deformed so as to be placed perpendicularly to the axis of revolution of the body. The portion intended to form the flange has a circumferential undulation with an amplitude that increases the closer it is to the free end of said portion during the draping, so as to obtain a smooth flange after deformation.

[0008] However, in the described solution, the mechanical deformation of the covered structure leads to a deformation of the covered fibrous structure and to significant stresses in the fibres, particularly near the angular apexes. These deformations are even more accentuated when there is a round angle between the flange and the main body, or when the angle between the flange and the main body is less than 90°. SUMMARY

[0009] The present invention aims to overcome the aforementioned drawbacks. To this end, the present invention proposes a method for determining the geometry of a covering mould for producing a blank of a composite material part, said part comprising a locally revolved main body having an axis directed in an axial direction and having one or more reference radii given along said axial direction, said main body extending along a circumferential direction locally around said axial direction, and said part comprising at least one flange extending from one end of the main body in an extension direction, the method comprising:

[0010] - determining a first surface of revolution having an axis directed in an axial direction, said first surface extending along said circumferential direction around said axial direction,

[0011] - determining a second surface in the extension of the first surface in an extension direction, the angle formed between the axial direction and the extension direction being greater than the angle formed between the axial direction and the extension direction, the second surface having in the extension direction undulations following each other continuously in the circumferential direction, each circumferential undulation corresponding to an arc of a circle belonging to the flange to be produced, the length of the curve of said undulations corresponding to the length of said arc of a circle,

[0012] The method is characterized in that the one or more radii presented by the first surface of revolution in the axial direction are less than the reference radii at the same position in the axial direction, said first surface corresponding to the curvature in the circumferential direction of the surface having the shape of the main body to be produced,

[0013] and in that the second surface has in the extension direction a corrective curvature such that all the points of each circumferential undulation have the same curve distance from the junction of the first surface and the second surface, said curve distance belonging to the second surface and having a value corresponding to the curve distance between the arc of a circle belonging to the flange to be produced corresponding to the circumferential undulation and the junction between the flange to be produced and the main body.

[0014] The first surface is intended to become the covering surface of the blank of the main body of the part to be produced. The second surface is intended to become the covering surface of the blank of the flange of the part to be produced.

[0015] The angle formed between the axial direction and the other direction is understood to be the angle from the body or from the surface corresponding to the body towards the flange or the surface corresponding to the flange, said angle being measured from the axial direction portion located on the side of the body or of the surface corresponding to the body towards the other nearest direction portion.

[0016] The curve distance or length between a point on the circumferential undulation curve and the junction between the first surface and the second surface is defined as the minimum curve distance belonging to the second surface and enables said point on the circumferential undulation curve to be connected to said junction.

[0017] The curve distance or length between the circular arc and the junction between the flange and the body is defined as the minimum curve distance belonging to the flange and enables the point on the circular arc to be joined to said junction.

[0018] Thus, by correcting the curvature in the direction of extension, the stresses in the fibres are limited after the covered blank has been shaped to obtain the preform of the part. Indeed, the circumferential undulations create length defects in the direction of extension, which can be corrected using the correction curvature. Furthermore, by determining different curve lengths between the circular arc belonging to the flange and the junction between the flange and the body, it is possible to take into account the possible radius of the round corner between said flange and said body from the design of the mould. Thus, the fibre tension at the location of said round corner is limited when the covered blank is shaped to obtain the preform of the part.

[0019] Furthermore, by manufacturing the first covering surface for the body blank with a radius smaller than the radius of the body to be manufactured, the angle between the first surface and the second surface intended for the flange blank is further increased, which further facilitates the passage of the covering head and the application of the fibre structure at the junction between the first surface and the second surface.

[0020] According to one particular feature of the application, the inflection points of each circumferential undulation curve are contained in the same circle.

[0021] According to another particular feature of the application, the minimum points of each circumferential undulation curve are contained in the same circle, the radius of which is greater than or equal to the radius of the circular arc forming the junction between the first surface and the second surface.

[0022] According to another particular feature of the application, the minimum points of each circumferential undulation curve are contained in the same circle, the radius of which is the same as the radius of the circular arc forming the junction between the first surface and the second surface.

[0023] Thus, it is ensured that the stresses in the fibres are as small as possible during the deformation of the fibre blank.

[0024] According to another particular feature of the application, the correction curvature at the maximum points of the circumferential undulations has a greater radius of curvature than the correction curvature at the inflection points of the circumferential undulations.

[0025] Indeed, the circumferential undulations deform the second surface, thus possibly leading to a lack of material at the maximum points of the circumferential undulations. Thus, by using more bending correction curvature at the maximum points of the circumferential undulations, more material can be provided at these locations.

[0026] According to another particular feature of the application, the angle between the axial direction and the extension direction is less than or equal to 120°, the angle between the axial direction and the extension direction being greater than 120°.

[0027] According to another particular feature of the application, the flange to be produced comprises a rounded corner at its junction with the body to be produced.

[0028] The application also relates to a method for manufacturing a composite material part, the part comprising: a partially revolved body having an axis directed in an axial direction, the body having one or more reference radii given along the axial direction, the body extending in a circumferential direction locally around the axial direction; and at least one flange extending from an end of the body in an extension direction, the method comprising:

[0029] - depositing a plurality of fibrous layers by automatic placement of fibres on a covering mould comprising a first covering surface and a second covering surface located in an extension of the first covering surface, the first and second covering surfaces respectively corresponding to first and second surfaces determined by a method for determining the geometry of the covering mould, the part of the blank produced on the first covering surface corresponding to the blank of the body and the part of the blank produced on the second covering surface corresponding to the blank of the flange,

[0030] - shaping the fibrous blank to obtain a fibrous preform, said shaping comprising developing the body blank in the circumferential direction to obtain a body preform having one or more reference radii along the axial direction and having the shape of the body to be produced, and shaping the flange blank to obtain a flange preform extending from an end of the body preform in the extension direction and having the shape of the flange to be produced, then

[0031] - densifying the fibrous preform by a matrix, thereby obtaining the composite material part.

[0032] Thereby, the flange blank has undulations corresponding to the circumferential undulation curve and the correction curvature of the second covering surface.

[0033] According to one particular feature of the application, the development of the body blank and the shaping of the flange blank are carried out simultaneously.

[0034] Thus, the forming of the fiber blank to obtain a fiber preform to be densified is performed in one step, in which the undulations on the flange blank are completely smoothed. This embodiment is thus simplified and faster. An intermediate forming step is thus avoided.

[0035] According to another particular feature of the application, the intermediate forming of the flange blank is first performed to obtain an intermediate flange preform extending from the end of the body blank in an intermediate extension direction, the angle between the intermediate extension direction and the axial direction being less than the angle between the extension direction and the axial direction, but greater than the angle between the extension direction and the axial direction, then the unfolding of the body blank is performed to obtain a body preform, the forming of the intermediate flange preform being then performed to obtain a flange preform extending from the body preform in the extension direction and having the shape of the flange to be produced.

[0036] In this embodiment, the intermediate step of forming the flange blank, which can partially fold the flange blank by smoothing the undulations, and the step of unfolding the body blank, which allows the complete forming of the flange blank, are performed separately. In this embodiment, the intermediate flange preform no longer comprises undulations. Thus, each of these operations can be better controlled. Moreover, by performing these two steps separately, for example, the compaction can be performed after the intermediate forming of the flange blank and before the unfolding of the body blank.

[0037] The application also relates to a method for manufacturing a composite material part comprising:

[0038] - producing a part section comprising a partially revolved body section having an axis directed in an axial direction and having a given reference radius, the body section extending partially around the axial direction in a circumferential direction, and at least one flange section extending from one end of the body section in an extension direction, the manufacturing of the part section being performed according to the manufacturing method described previously,

[0039] - assembling the part sections to obtain a composite material part having a complete revolution.

[0040] Thus, the cover mold geometry of the application makes it possible to produce not only partially revolved parts, but also completely revolved parts, by assembling several partially revolved part sections. BRIEF DESCRIPTION OF DRAWINGS

[0041] [ Figure 1 ] Figure 1is a three-dimensional view of a part that can be produced by using the covering mold according to the present application, comprising a body and at least one flange.

[0042] [ Figure 2A ] Figure 2A is a schematic cross-sectional view of the part of Figure 1 at a first radius level of the part.

[0043] [ Figure 2B ] Figure 2B is a schematic cross-sectional view of the part of Figure 1 at a second radius level of the part.

[0044] [ Figure 2C ] Figure 2C is a schematic cross-sectional view of the part of Figure 1 at a third radius level of the part.

[0045] [ Figure 3 ] Figure 3 is a three-dimensional schematic view of a first surface of a mold according to the present application.

[0046] [ Figure 4A ] Figure 4A is a schematic cross-sectional view of the first surface of Figure 3 at a first radius level of the first surface.

[0047] [ Figure 4B ] Figure 4B is a schematic cross-sectional view of the first surface of Figure 3 at a second radius level of the first surface.

[0048] [ Figure 4C ] Figure 4C is a schematic cross-sectional view of the first surface of Figure 3 at a third radius level of the first surface.

[0049] [ Figure 5 ] Figure 5 is a partial schematic cross-sectional view of a part of Figure 1 for determining the length of a circular arc belonging to a flange.

[0050] [ Figure 6 ] Figure 6 is a partial schematic cross-sectional view of a part of Figure 1 for determining the length of a flange.

[0051] [ Figure 7 ] Figure 7 is a three-dimensional view of a first surface and a second surface obtained according to the present application, for producing a covering mold for a part of Figure 1 .

[0052] [ Figure 8 ] Figure 8 is a view of the surface shown in Figure 7 , showing the circumferential undulations.

[0053] [ Figure 9 ] Figure 9 is a first partial three-dimensional view of the surface shown in Figure 7 , showing the corrective curvature.

[0054] [ Figure 10 ] Figure 10 is a second partial three-dimensional view of the surface shown in Figure 7 , showing the corrective curvature.

[0055] [ Figure 11 ] Figure 11 is a schematic view of a covering mold comprising Figures 7 to 10 the surface shown.

[0056] [ Figure 12 ] Figure 12 is a partial schematic view of a covered assembly formed by automated fiber placement.

[0057] [ Figure 13 ] Figure 13 is a partial schematic view of a fiber blank obtained by covering the mold shown in Figure 11 .

[0058] [ Figure 14 ] Figure 14 is a partial schematic view of an intermediate fiber preform obtained by unfolding the blank shown in Figure 13 .

[0059] [ Figure 15 ] Figure 15 is a partial schematic view of a fiber preform obtained by shaping the blank shown in Figure 13 or the intermediate preform shown in Figure 14 .

[0060] [ Figure 16 ] Figure 16 is a schematic view of a complete rotary part obtained by assembling the two subparts shown in Figure 1 .DETAILED DESCRIPTION

[0061] Figure 1 shows a part 4 made of composite material comprising a main body 1 and at least one flange 2. The term "flange" can refer to a collar. The part 4 can be an aeroengine casing comprising two flanges.

[0062] The main body 1 is a partially rotary volume whose axis of revolution A is along an axial direction D AThe body 1 is locally revolved about an axis of revolution A C The body 1 extends partially about its axis of revolution A. The circumferential direction D C extends in a plane perpendicular to the axial direction D A . The body 1 can have a truncated cone or tubular shape, or any axisymmetric profile.

[0063] The body 1 has one or more reference radii given along said axial direction D A . In each plane perpendicular to the axial direction D A , the reference radii R R1 , R R2 , R R3 are defined as the distance between the axial direction D A and the circular arc formed by the body 1, corresponding to a position r1, r2, r3 on the axial direction D A , as illustrated in Figures Figure 1 , Figure 2A , Figure 2B and Figure 2C . Furthermore, each position r1, r2, r3 is also associated with a length L1, L2, L3 of the circular arc formed by the body 1 in a plane perpendicular to the axial direction D A and passing through said position r1, r2, r3.

[0064] In the examples illustrated in Figures Figure 1 , Figure 2A , Figure 2B and Figure 2C , the circular arc formed by the body 1 of the part 4 in each plane perpendicular to the axial direction D A is truncated by a reference angle Θ R of 180°. If the reference angle Θ R intersecting the circular arc formed by the body 1 in each plane perpendicular to the axial direction D A is less than 180°, or greater than 180° but strictly less than 360°, then of course it does not depart from the framework of the invention.

[0065] The flange 2 is present at one end of the body 1 and extends from said end of the body 1. The flange 2 is annular or truncated conical, with a local axis of revolution A directed along the axial direction D A . The flange 2 extends from the body 1 along an extension direction D E .

[0066] The entire composite part 4 is therefore a locally revolved volume, with an axis A directed along the axial direction D A . The extension direction D E is defined for each connection point between the body 1 and the flange 2. The extension direction D EThey can be oriented differently. However, the extending direction D is defined for each point of the joint between the body 1 and the flange 2. E They must intersect at a single point on the axis of rotation A belonging to component 4.

[0067] exist Figure 1 In the example shown, flange 2 forms a 90° angle with the axis of rotation A of body 1, which corresponds to the angle perpendicular to the axial direction D. A The direction of extension D E Furthermore, the flange 2 forms an acute angle of less than 90° with the surface of the body 1 to which it extends, making it particularly difficult to manufacture component 4 according to existing automated fiber placement methods. If the flange forms an angle of less than 90° with the axis of rotation of the body, which corresponds to less than 90° between the extension direction and the axial direction, then of course it does not deviate from the framework of the invention. If the flange forms an angle of greater than 90° with the axis of rotation of the body, but if this angle is small enough to cause collision problems during automated coverage at said angle, then it also does not deviate from the framework of the invention.

[0068] Based on the well-known Automated Fiber Placement (AFP) method, it is desirable to produce by coating a surface with a fiber structure. Figure 1 The composite component 4 is shown. However, the small angle formed between the flange 2 and the body 1 of the component 4 makes it impossible to directly coat the surface having the final shape of the component 4. In fact, this angle does not allow the automatic deposition head or roller to pass through completely, thus resulting in unsatisfactory deposition of the fiber structure at the bottom of this angle.

[0069] Therefore, the present invention proposes to design a specific covering geometry that has a large or even flat angle between a first surface of a blank intended to cover the body 1 and a second surface of a blank intended to cover the flange 2, so as to enable automatic covering of the fiber structure.

[0070] In order to allow the covered fiber blank to be formed at the correct angle without generating significant tension in the covered fiber structure, and more specifically, near the apex of the angle between flange 2 and body 1, it is necessary to design a specific geometry for the covering mold.

[0071] For the sake of simplicity of the drawings and of the description, the first "geometric" surface determined according to the method for determining a covering geometry of the application and the first "actual" covering surface of the mold are identical and coincide, to have the same reference "100". Likewise, the second "geometric" surface determined according to the method for determining a covering geometry of the application and the second "actual" covering surface of the mold are identical and coincide, to have the same reference "200". Of course, it does not depart from the framework of the application if the first "actual" covering surface and the second "actual" covering surface correspond only to a portion of the first determined "geometric" surface and of the second determined "geometric" surface.

[0072] The mold comprises a first covering surface 100 for covering the fiber blank of the body 1 and a second covering surface 200 for covering the fiber blank of the flange 2. The second surface 200 of the mold extends along the extension direction D P in the extension of the first surface 100 of the mold.

[0073] Preferably, at any point of the junction between the first surface and the second surface, the tangent to the first surface coincides with the tangent to the second surface.

[0074] If at any point of the junction between the first surface and the second surface, the tangent to the first surface is slightly inclined with respect to the tangent to the second surface, it is of course not departing from the framework of the application, provided that the junction between the first surface and the second surface is easily accessible for the head or roller for the automatic deposition of the fiber structure. Thus, the angle between the tangent to the first surface and the tangent to the second surface at any point of the junction between the first surface and the second surface is generally greater than or equal to 120°, preferably equal to 180°.

[0075] The first surface 100 is a partial or complete revolution surface whose revolution axis is along the axial direction D A The first surface 100 is oriented in the axial direction D A on a length at least equal to the length of the body 1 to be manufactured in the axial direction D A .

[0076] As Figure 3 , Figure 4A , Figure 4B and Figure 4C indicated, the first surface 100 forms, in each plane perpendicular to the axial direction D A , an arc of circle truncated by a construction angle θ R greater than a reference angle θ C . Thus, the first surface 100 forms, in the circumferential direction D CIt has a more "closed" shape than the main body 1. With the first surface 100 being a fully rotating surface, the first surface 100 of the mold thus has a shape perpendicular to the axial direction D. A If the arc formed on each plane is a complete circle, then the construction angle θ is considered to be... C It equals 360°.

[0077] Preferably, corresponding to the reference angle θ R With construction angle θ C The ratio between them is between 0.6 and 0.8. For example, a semi-shell-shaped body 1, i.e. Figures 1 to 2C The reference angle θ shown R It is 180°, and has a first surface with complete rotation, i.e., the construction angle θ. C A 360° transformation corresponds to a ratio of 0.5.

[0078] like Figure 3 , Figure 4A , Figure 4B and Figure 4C As shown, the first surface 100 is along the axial direction D A It has one or more construction radii. In the direction perpendicular to the axial direction D... A In each plane, the construction radius is defined as the axial direction D. A The distance between the arc formed by the first surface 100 and the reference radius R of the body 1. R1 R R2 R R3 Corresponding axial direction D A For each position r1, r2, r3, the construction radius R of the first surface 100 C1 R C2 R C3 Related. Therefore, each construction radius R of the first surface 100 is associated. C1 R C2 R C3 With reference radius R R1 R R2 R R3 Related. For the axial direction D A For each position r1, r2, r3, the construction radius R of the first surface 100 C1 R C2 R C3 It must be smaller than the corresponding reference radius R R1 R R2 R R3 .

[0079] For the axial direction D Athe length of the circular arc formed by the first surface 100 is equal to the length L1, L2, L3 of the circular arc of the body 1 associated with said position r1, r2, r3. In other words, to determine the first surface 100 of the mould, the curve distance of the body 1 in the circumferential direction D C is maintained. Thus, for each position r1, r2, r3 of the axial direction D A , the ratio of the radii R C1 , R C2 , R C3 to the reference radii R R1 , R R2 , R R3 corresponds to the above-mentioned transformation ratio.

[0080] The first surface 100 thus corresponds to the curvature along the circumferential direction D C of the surface of the body to be manufactured.

[0081] It is possible to produce a geometrical mould having the shape of the part to be manufactured, a geometrical mould first part having the shape of the body to be manufactured and a geometrical mould second part having the shape of the flange to be manufactured. When the above-mentioned transformation is applied to the first part of the geometrical mould of the part to be manufactured, this first part corresponds to the curvature along the circumferential direction D C with a reduced radius so as to obtain the first surface 100. This transformation of the geometrical mould first part of the part to be manufactured will produce a slope of the geometrical mould second part having the shape of the flange to be manufactured, which will no longer extend along the extension direction D E but along an intermediate extension direction D Pi so as to obtain a second intermediate geometrical surface 200b, as shown in Figure 3 .

[0082] The angle formed between the first surface 100 and the second intermediate geometrical surface 200b is greater than the angle formed between the surface of the body and the surface of the flange to be manufactured. As a reminder, the angle formed between the axial direction and the other direction must be understood here as the angle directed from the first surface 100 towards the second intermediate geometrical surface 200b, said angle being measured from the part of the axial direction located on the side of the first surface 100 towards the second intermediate geometrical surface 200b.

[0083] The second surface 200 of the mould is designed in several steps. The second surface 200 is preferably determined from the second intermediate geometrical surface 200b. However, if the second surface 200 is determined directly from the geometrical mould of the flange to be produced, this does not depart from the framework of the invention.

[0084] The first step consists in determining the circumferences of one or more circular arcs belonging to the flange or to the second intermediate geometric surface 200b, depending on the distance of said circular arcs with respect to the axis of revolution and on their center on the axis of revolution, which is a point belonging to the axis of revolution, according to the chosen reference. In the example shown in Figure 5 and Figure 6 In the example shown, said circular arcs belong to a plane perpendicular to the axial direction.

[0085] In the case where the second surface 200 is determined directly from the geometric mold of the flange to be produced, if the fillet forms a junction between the flange and the main body, or in the case where the direction of extension is not perpendicular to the axial direction, it is necessary to take into account the position of the center of the circular arc belonging to the flange on the axis of revolution. It is considered that the fillet making the junction between the flange and the valve body is part of the flange.

[0086] In the case where the second surface 200 is determined from the second intermediate geometric surface 200b, if the fillet makes a junction between the first surface 100 and the second intermediate geometric surface 200b, or in the case where the intermediate direction of extension D Pi is not perpendicular to the axial direction, it is necessary to take into account the position of the center of the circular arc belonging to the intermediate geometric surface 200b on the axis of revolution. It is considered that the fillet making the junction between the first surface 100 and the second intermediate geometric surface 200b is part of the second intermediate geometric surface 200b.

[0087] In the example shown in Figure 5 and Figure 6 It is necessary to take into account the fillet between the first surface 100 and the second intermediate geometric surface 200b, since there is a fillet between the main body 1 and the flange 2. It is therefore necessary to determine the length of the circular arc belonging to the second intermediate geometric surface 200b and the length of the circular arc belonging to the portion of the second intermediate geometric surface 200b extending in the intermediate direction of extension D Pi .

[0088] If the second surface 200 is determined directly from the geometric mold of the flange to be produced, the length of the circular arc belonging to the fillet of the flange 2 and the length of the circular arc belonging to the portion of the flange 2 extending in the direction of extension D E will be determined.

[0089] As Figure 5 and Figure 6As shown, several points A0, A1, A2, A3, A4, and A5 can be selected belonging to the second intermediate geometric surface 200b or to the flange 2 located at different distances from the axis of rotation A. The selected points A0, A1, A2, A3, A4, and A5 preferably include point A0 belonging to the junction between the first surface 100 and the second intermediate geometric surface 200b, or, depending on the situation, point A0 belonging to the junction between the mold of the body to be produced and the mold of the flange 2 to be produced, and, depending on the situation, point A5 belonging to the end of the second intermediate geometric surface 200b or the end of the geometric mold of the flange 2. Because of the presence of rounded corners, it is necessary to discretize the rounded corners. Therefore, the selected points A0, A1, A2, A3, A4, and A5 preferably include point A1 belonging to the rounded corner and point A2 located at the end of the rounded corner opposite to the junction. Of course, selecting more or fewer points, or having different positions, will not deviate from the framework of the invention.

[0090] like Figure 5 As shown, each of points A0, A1, A2, A3, A4, and A5 is associated with a position a0, a1, a2, a3, a4, and a5 on the axis of rotation A, respectively. Each of points A0, A1, A2, A3, A4, and A5 is also associated with an arc that includes that point, the center of which belongs to the axis of rotation A. Therefore, each of points A0, A1, A2, A3, A4, and A5 is associated with an arc whose center has a position a0, a1, a2, a3, a4, and a5, respectively. Each arc associated with points A0, A1, A2, A3, A4, and A5 is along the circumferential direction D. C They have lengths l0, l1, l2, l3, l4, and l5 respectively.

[0091] The second step includes determining the length of one or more curves from the junction between the first surface 100 and the second intermediate geometric surface 200b, or from the junction between the geometric mold of the flange and the geometric mold of the body (as the case may be) to one or more arcs belonging to the second intermediate geometric surface 200b or one or more arcs belonging to the flange.

[0092] When the second surface 200 is determined directly based on the geometry of the flange to be produced, if a sharp ridge forms the joint between the flange and the body, the curve length to be determined between the joint and the arc belonging to the flange is along the extension direction D. E The length of the extended straight line. Therefore, in this construction, the length starting from the joint is easily determined. In the case where the joint between the flange and the valve body is formed by a fillet, the curve length to be determined between the joint and the arc belonging to the flange is not a straight line.

[0093] When the second surface 200 is defined by the second intermediate geometric surface 200b, if a sharp ridge forms the junction between the first surface 100 and the second intermediate geometric surface 200b, then the curve length to be determined between the junction and the arc belonging to the second intermediate geometric surface 200b is along the intermediate extension direction D. Pi The length of the extended straight line. Therefore, in this configuration, the length starting from the joint is easily determined. In the case where the joint between the first surface 100 and the second intermediate geometric surface 200b is formed by a rounded corner, the curve length to be determined between the joint and the arc belonging to the second intermediate geometric surface 200b is not a straight line.

[0094] exist Figure 5 and Figure 6 In the example shown, the fillet between the first surface 100 and the second intermediate geometric surface 200b must be considered because there is a fillet between the body 1 and the flange 2. Therefore, it is necessary to determine the curve length between the joint and the arc belonging to the second intermediate geometric surface 200b or the arc of the geometric mold of the flange 2, depending on the specific circumstances.

[0095] Reconsider points A0, A1, A2, A3, A4, and A5, given the relevant arc lengths l0, l1, l2, l3, l4, and l5. Draw the extension direction D. P The length of the curve between points A0, A1, A2, A3, A4, and A5 on the curve, such as Figure 6 As shown, a set of corresponding points B0, B1, B2, B3, B4, and B5, separated by curve lengths e1, e2, e3, e4, and e5, are obtained. Therefore, the curve length from the joint to the arc corresponding to point A4 will be the sum of lengths e1, e2, and e3. Therefore, the total curve length e of the second intermediate geometric surface 200b or flange 2 from the joint to its end is... 总计 It will be the length between B0 and B5, that is, the sum of lengths e1, e2, e3, e4, and e5, such as... Figure 6 As shown.

[0096] Therefore, each length l0, l1, l2, l3, l4, l5 of the arc is associated with a curve length defined from the joint, which has values ​​of 0, e1, e1+e2, e1+e2+e3, e1+e2+e3+e4, e, respectively. 总计 .

[0097] Generally, the first and second steps can be performed simultaneously or one after the other in any order. At the end of the first two steps, the length of each curve starting from the joint is associated with the length of the arc.

[0098] The third step consists in determining the geometry of the second surface 200 of the mold, which extends along the extension direction D P in the extension of the first surface 100 of the mold.

[0099] As Figure 7 and Figure 8 illustrated, the second surface 200 is designed to have undulations in the circumferential direction D C . Thus, the second surface 200 has a plurality of circumferential undulating curves 21, 22, 23, 24, 25 which are consecutive to each other in the axial direction D A . The circumferential undulating curves comprise all the points positioned at the same curve distance from the junction between the first surface 100 and the second surface 200, said curve distance belonging to the second surface 200.

[0100] The undulations of the same curve 21, 22, 23, 24, 25 have a regular period in the circumferential direction D C . The undulations of the curve 21, 22, 23, 24, 25 consist of a succession of alternating concave curves and convex curves in the circumferential direction D C . The undulations of the curve 21, 22, 23, 24, 25 are preferably periodic and can be sinusoidal or generally sinusoidal as Figure 8 illustrated.

[0101] The undulations of the same curve 21, 22, 23, 24, 25 have a plurality of maximum points and a plurality of minimum points, the plurality of maximum points being distributed on a circle whose center belongs to the axis of revolution A of the first surface 100, the plurality of minimum points being distributed on a circle whose center belongs to the axis of revolution A of the first surface 100. Thus, the undulations of the same curve 21, 22, 23, 24, 25 have a constant amplitude in the circumferential direction D C . The minimum points are defined as the points of the curve 21, 22, 23, 24, 25 closest to the axis of revolution A, the maximum points being defined as the points furthest from the axis of revolution A.

[0102] The inflection points of the same curve 21, 22, 23, 24, 25 of undulations are distributed on a circle whose center belongs to the axis of revolution of the first surface.

[0103] The amplitude and the number of undulations of the curve 21, 22, 23, 24, 25 are chosen to allow the passage of an automatic fiber deposition head at any point of the second surface 200. Thus, the amplitude is not too great to allow the passage of said head or to be able to deposit several strands at once.

[0104] In Figures 7 to 10In the example shown, the minima of all circumferential undulations are distributed on a circle of the same radius and have the same radius as the circular arc 20 forming the junction between the first surface 100 and the second surface 200. Of course, it does not depart from the framework of the invention if the minima of all circumferential undulations are distributed on a circle of the same radius, but the radius is greater than the radius of the circular arc forming the junction between the first surface and the second surface. It also does not depart from the framework of the invention if the minima of each circumferential undulation are distributed on a circle of different radius, as long as the radius is greater than the radius of the circular arc forming the junction between the first surface and the second surface.

[0105] It also does not depart from the framework of the invention if the inflection points of all circumferential undulations are distributed on a circle of the same radius and have the same radius as the circular arc forming the junction between the first surface and the second surface.

[0106] As Figures 7 to 10 is shown, the amplitude of the circumferential undulations 21, 22, 23, 24, 25 increases the further away from the junction between the first surface 100 and the second surface 200 in the axial direction D A .

[0107] The length of the curve of each of the circumferential undulations 21, 22, 23, 24, 25 depends on the curve distance of the circumferential undulation 21, 22, 23, 24, 25 relative to the junction between the first surface 100 and the second surface 200. By using the arc length and the curve length pairs defined by the junction (l1; e1), (l2; e1+e2), (l3; e1+e2+e3), (l4; e1+e2+e3+e4), (l5; e 总计 ) determined at the end of the first and second steps, it can be derived that the length of the curve of the circumferential undulation 21, 22, 23, 24, 25 located at a given curve distance e1, e1+e2, e1+e2+e3, e1+e2+e3+e4, e 总计 from the junction is the length of the associated circular arc l1, l2, l3, l4, l5.

[0108] Thus, when the circumferential undulations 21, 22, 23, 24, 25 respectively leave the junction at the curve distances e1, e1+e2, e1+e2+e3, e1+e2+e3+e4, e 总计 , they respectively have the curve lengths l1, l2, l3, l4, l5.

[0109] As Figure 9 and Figure 10 is shown, the second surface 200 is designed such that the amplitude of the circumferential undulations 21, 22, 23, 24, 25 increases the further away from the junction in the extension direction D PThe upper part has curvatures 32, 33. Thus, the distances e1, e2, e3, e4, e 总计 may not be straight lines, depending on their position on the second surface 200. These curvatures 32, 33, called “corrective” curvatures, are necessary to limit the stresses during the deformation of the covered assembly, mainly at the junction between the future body and the future flange. Indeed, if the distances e1, e2, e3, e4, e 总计 are straight lines, as in the case of the previous state, the distance between the junction and the end of the second surface 200 will vary according to its position relative to the circumferential undulations.

[0110] For example, if the minima of all the circumferential undulation curves are distributed on a circle of the same radius as the radius of the circular arc 20 forming the junction between the first surface 100 and the second surface 200, as in our example (see Figure 8 ), the straight-line distance between the junction and the end of the second surface 200 is shorter at the troughs of the circumferential undulations and greater at the crests of the circumferential undulations. Thus, when the covered assembly is deformed, several positions of the flange 2 will lack length in the extension direction D E , which will create stresses in the composite material of the part 4.

[0111] As Figure 9 illustrated, the second surface 200 presents, in the extension direction D P , corrective curvatures 32, 33 having at least one inflection point. The corrective curvatures 32, 33 presented by the second surface 200 in the extension direction D P may be part of an undulation curve oscillating between a maximum point and a minimum point.

[0112] The second surface 200 can also comprise straight-line lengths 31 extending from the junction towards the end of the surface 200 in the extension direction D P .

[0113] As Figure 10 illustrated, all the corrective curvatures 32, 33 and the straight-line lengths 31 of the second surface 200 directed in the extension direction D P have the same length of curve, of value e 总计 determined during the preceding steps. Furthermore, the length of curve of the curve 21, 22, 23, 24 or 25 between the junction and the circumferential undulation in the extension direction D P traveled by the corrective curvatures 32, 33 or the straight-line lengths 31 will respectively have the values e1, e1 +e2, e1 +e2+e3, e1 +e2+e3+e4, e 总计 .

[0114] We thus obtain a set of points C0, C1, C2, C3, C4, C5 which are located at the intersection of the straight line of length 31 (or of the correction curvature 32, 33) with each circumferential undulation curve 21, 22, 23, 24, 25. The portion to be covered on the second surface 200 will follow the direction of extension D E When deformed, each point in contact with the points C0, C1, C2, C3, C4, C5 will be located at the position of the points A0, A1, A2, A3, A4, A5 selected during the first or second step, respectively.

[0115] Finally, the parameters of the circumferential undulations and of the correction curvatures 32, 33 of the second surface 200, such as the amplitude or the radius of curvature, are chosen to allow the automatic fiber deposition head to pass at any point of the second surface 100.

[0116] The design of the covering geometry described above thus makes it possible to produce a suitable mold 500 for automatic fiber placement (AFP) comprising a first surface 100 and a second surface 200, as Figure 11 illustrated. The mold can be produced by additive manufacturing or according to usual manufacturing methods such as machining or casting. The mold can be several separable parts rather than a single piece to facilitate the demolding operation(s).

[0117] A method for manufacturing a composite material part will now be described in connection with Figures 12 to 15 the method comprising at least a step of covering by automatic placement of fibers on a mold designed as described above.

[0118] Figure 12 The structure of the deposition head 6 of the device for implementing the AFP technique is illustrated schematically. The structure of the deposition head 6 is well known. The deposition head 6 is fed by a strip or fiber core 30.

[0119] The fiber strip or core 30 can be dry or impregnated. The fiber strip or core 30 can be impregnated, for example, with a water suspension containing particles of a matrix precursor, with a thermosetting polymer or with a thermoplastic polymer, as described in document FR 3 062 336 A1. More generally, the strip 30 can be impregnated with a resin.

[0120] The fiber strip or core 30 can be conveyed by a conveying element 5 to a pressure application element 7 located at one side of the surfaces 100 and 200 of the covering mold. The conveying element 5 is in the form here of a pair of counter-rotating rollers 5a and 5b between which the strip or core 30 is present. The conveying element 5 makes it possible to advance the strip or core 30 to the pressure application element 7. The pressure application element 7 applies pressure on the strip or core 30 in order to deposit on the first surface 100 and on the second surface 200 of the covering mold. The pressure application element 7 is in the form here of a roller.

[0121] The deposition head 6 can also comprise a heating element 9 located in the vicinity of the pressure application element 7. In the case where the strip or the core 30 is impregnated with a thermoplastic or thermosetting polymer, this heating element 9 can heat the impregnated strip or core 30 during the deposition of the impregnated strip or core 30 to fluidify the polymer, thus imparting the desired tackiness to the deposited strip or core 30.

[0122] During the deposition, the deposition head 6 is movable in order to apply the strip or the core 30 to a first determined area of the cover mold, for example on a portion of the first surface 100 of the mold. Once the application has been made on this first area, the cutting element 11 of the deposition head 6 cuts the strip or the core 30. After this cutting, a deposition of a first fibrous structure formed of a first section of the strip or the core 30 is thus obtained on the first area of the mold.

[0123] The strip or the core 30 in the deposition head 6 is then advanced to the pressure application element 7 by actuating the transfer element 5, so as to continue the production of the blank. The deposition head 6 can be moved in order to make a deposition of the core or the strip 30 on a second area of the mold. A deposition of a second fibrous structure formed of a second section of the strip 30 is then obtained on the second area of the mold, in a similar manner to that described previously.

[0124] The production of the blank is then continued by depositing several other fibrous structures in the same manner as described above, until the first surface 100 and the second surface 200 are covered.

[0125] The blank can then be subjected to a chemical or thermal treatment according to the nature of the fibrous structures that have been covered.

[0126] A fibrous blank 4b produced by covering is then obtained as shown in Figure 13 The fibrous blank 4b comprises a main blank 1 b that has been covered on the first surface 100 and a flange blank 2b that has been covered on the second surface 200. The main blank 1 b and the flange blank 2b form the fibrous blank 4b.

[0127] The fibrous blank 4b is then shaped in order to obtain a fibrous preform 4d having the shape of the part 4 to be produced, the fibrous preform 4d comprising a main preform 1 d and a flange preform 2d. The shaping of the fibrous blank 4b comprises the shaping of the main blank 1 b and the shaping of the flange blank 2b, which can be carried out simultaneously or one after the other.

[0128] According to a first variant, the shaping of the fibrous blank 4b comprises a first intermediate step, namely the shaping of the flange blank 2b, in order to obtain an intermediate flange preform 2c positioned in the extension of the main blank 1 b and extending from the main blank 1 b in an intermediate extension direction D Pi The intermediate flange preform 2c extends from the main blank 1 b in an intermediate extension direction D Figure 14The intermediate flange preform 2c is obtained by partial folding of the flange blank 2b, said folding being allowed by the reliefs present on said flange blank 2b. In the first step of this first variant, the body blank lb does not undergo any deformation.

[0129] Preferably, this variant corresponds to the case where the second surface 200 of the mold has been determined according to a second intermediate geometric surface 200b and not directly according to the geometry of the flange 2. Thus, the intermediate flange preform 2c has the shape of the second intermediate geometric surface 200b described above. Thanks to the particular geometry of the second surface 200 used to cover the flange blank 2b, the flange blank 2b deforms perfectly so that each relief curve 21, 22, 23, 24, 25 becomes a circular arc with an appropriate radius and so that each correction curvature 32, 33 extends along the intermediate extension direction D Pi . Thus, there are no significant stresses in the fibers of the intermediate flange preform 2c, in particular at the junction between the body blank lb and the intermediate flange preform 2c.

[0130] In this first variant, the shaping of the fiber blank 4b also comprises, after the first step shown in Figure 14 , a second step of shaping Figure 15 the body blank lb shown. During this second step, the body blank lb is developed along the circumferential direction D C to obtain the body preform ld. The development step makes it possible to "open" the body blank lb by reducing the angle value with which the circular arcs formed on each plane perpendicular to the axial direction D A are crossed: this angle decreases from the construction value θ C until the desired reference angle θ R is reached. In addition, the development step makes it possible to increase the radius with which the body blank lb presents itself along the axial direction D A from the construction values R C1 , R C2 , R C3 until the desired reference values R R1 , R R2 , R R3 are reached. Thus, at the end of the development step, the body preform ld obtained has the same dimensions as the body 1 to be obtained.

[0131] The development of the body blank lb further causes the intermediate flange preform 2c to be shaped into a flange preform 2d having the shape and the geometry of the flange 2 to be obtained. Indeed, the development of the body blank lb to obtain the body preform ld causes a change in the slope of the intermediate flange preform 2c. Thus, before the second step, the intermediate flange preform 2c has a first radius of curvature R PiThe extended intermediate flange preform 2c becomes, after this second step, a flange preform 2d extending from the main body preform Id in the extension direction D E The extended flange preform 2d.

[0132] In this first variant, an intermediate compacting step can be carried out between the first and second steps.

[0133] According to a second variant, the forming of the fibrous blank 4b comprises a first step of forming a main body blank lb to obtain a main body preform Id.

[0134] In this first step, the main body blank lb is unwound along the circumferential direction D C to obtain the main body preform Id. The unwinding step makes it possible to "open" the main body blank lb by reducing the angle of intersection with the circular arcs formed on each plane perpendicular to the axial direction D A of said blank: this angle is reduced from the construction value θ C until the desired reference angle θ R is reached. Furthermore, the unwinding step makes it possible to increase the radius presented by the main body blank lb along the axial direction D A from the construction value R C1 , R C2 , R C3 until the desired reference value R R1 , R R2 , R R3 is reached. Thus, at the end of the unwinding step, the main body preform Id obtained has the same dimensions as the main body 1 to be obtained.

[0135] The unwinding of the main body blank lb further causes an intermediate forming of the flange blank 2b, which makes it possible to obtain a transition preform of the flange (variant not shown). Indeed, the unwinding of the main body blank lb to obtain the main body preform Id causes a change in the slope of the flange blank 2b. Thus, the flange blank 2b extending from the main body blank lb in the extension direction D P becomes, after the first step, a flange transition preform extending from the main body blank lb in the extension transition direction. As a reminder, the angle formed between the axial direction and the other direction must be understood here as the angle from the surface of the blank or of the main body preform towards the surface of the blank or of the flange transition preform, said angle being measured from the axial direction portion located on the side of the surface of the blank or of the main body preform towards the surface of the blank or of the flange transition preform.

[0136] Preferably, this variant corresponds to the case where the second surface 200 of the mould is determined directly from the geometry of the flange 2, and not from a second intermediate geometric surface 200b as described above. Thus, the flange transition preform always has the undulations described above.

[0137] In this first variant, the shaping of the fibrous blank 4b also comprises a second step of shaping the flange transition preform into a flange preform 2d. The flange preform 2d is obtained by folding down the flange transition preform, the folding being allowed by the reliefs present on said flange transition preform. In this second step of the second variant, the body preform 1d does not undergo any deformation.

[0138] In this second variant, an intermediate compaction step can be performed between the first step and the second step.

[0139] In the first and second variants described here, the execution of the two steps respectively allows a better control of each step, in particular a better control of the unfolding of the body blank 1b and a better control of the smoothing of the reliefs initially present on the flange blank 2b.

[0140] However, it can be desirable to shape the fibrous blank 4b of the part immediately and quickly. In this third variant, the shaping of the fibrous blank 4b into the fibrous preform 4d of the part 4 is done in a single step comprising the unfolding of the body blank 1b and the complete folding, and the smoothing of the reliefs of the flange blank 2b.

[0141] At the end of each of the three variants described above, the fibrous preform 4d of the part to be produced is obtained, comprising the body preform 1d of the body 1 to be produced and the flange preform 2d of the flange 2 to be produced, as Figure 15 Due to the particular geometry for covering the second surface 200 of the flange blank 2b, the flange blank 2b is perfectly deformed so that each relief curve 21, 22, 23, 24, 25 becomes a circular arc with an appropriate radius of the flange 2 to be produced, and so that each correction curvature 32, 33 extends in the direction D E upward. Thus, there are no significant stresses in the fibers of the fibrous preform 4d, in particular at the junction between the body preform 1d and the flange preform 2d.

[0142] The unfolding and shaping of the fibrous blank 4b can be performed using one or more reference mandrel(s) having the shape of the body 1 to be produced, of the flange 2 to be produced, or of the intermediate flange preform 2c required. Thus, the fibrous blank is unfolded, shaped or smoothed to match the shape(s) of the mandrel(s). The shaping of the fibrous blank 4b can be performed by mechanical deformation. The shaping of the fibrous blank 4b can also be performed using an airbag.

[0143] Then, if this step has not already been performed, the fibrous preform 4 thus obtained can be subjected to a heat treatment to form a matrix, thus obtaining the final part 4 or at least one intermediate part close to the final part 4.

[0144] If it is desired to manufacture a composite part which rotates completely around an axis of revolution, including a complete revolution and a flange extending from one end of said revolution, its manufacture can be broken down by producing several sectors of said part distributed around the axis of revolution, then assembling said sectors to obtain the desired part. Since said sectors of the part have a partial revolution, they can be produced according to the manufacturing method described above. For example, as shown in Figure 16 Fig. 4, two parts 4 can be manufactured as described above, then assembled to form a complete revolution part 40 having an axis of revolution A.

[0145] In the present application, the thickness is ignored for geometrical reasons. If it is desired to take into account the thickness of the part, the fibre blank and the fibre preform, it is necessary to refer to the median surface and the neutral length in order to balance the tensile and compressive effects of the upper and lower surfaces.

[0146] The expression "between... and..." must be understood as including the boundaries.

Claims

1. A method for determining the geometry of a covering mold (500) of a blank (4b) for producing a composite material part (4), said part (4) comprising a partially revolved body (1) having an axis (A) directed along an axial direction (D A ) and having one or more reference radii (R R1 , R R2 , R R3 ) given along said axial direction (D A ), said body (1) extending along a circumferential direction (D C ) partially around said axial direction (D A ), and said part (4) comprising at least one flange (2) extending from one end of said body (1) along an extension direction (D E ), said method comprising:​​​​​​​​ - determining a first surface (100) having an axis of revolution oriented along said axial direction (D A ), said first surface (100) extending along said circumferential direction (D C ) around said axial direction (D A ), - determining a second surface (200) located in the extension of the first surface (100) along an extension direction (D P ) forming an angle with the axial direction (D A ) and with the extension direction (D P ) greater than the angle formed between the axial direction (D A ) and the extension direction (D E ), said second surface (200) having, in the extension direction (D P ), undulating curves (21, 22, 23, 24, 25) following each other in the circumferential direction (D C ), each circumferential undulating curve (21, 22, 23, 24, 25) corresponding to an arc of a circle belonging to the flange (2) to be produced, the curve length of the undulating curves (21, 22, 23, 24, 25) corresponding to the length (li, I2, I3, I4, I5) of the arc of a circle, The method is characterized in that the first surface (100) of the revolution presents, along an axial direction (D A ) one or more radii (R C1 , R C2 , R C3 ) smaller than a reference radius (R R1 , R R2 , R R3 ) at the same position (r1, r2, r3) along the axial direction (D A ), the first surface (100) corresponding to the curvature in a circumferential direction (D C ) of a surface having the shape of the body (1) to be produced, and said second surface (200) has a corrective curvature (32, 33) in said extension direction (D P ) such that all the points of each circumferential undulating curve (21, 22, 23, 24, 25) have the same curvilinear distance from the junction with said first surface (100) and with said second surface (200), said curvilinear distance belonging to said second surface (200) and having a value corresponding to the curvilinear distance (el, el+e2, el+e2+e3, el+e2+e3+e4, e 总计 ) between the circular arc of said circumferential undulating curve (21, 22, 23, 24, 25) belonging to said flange (2) to be produced and the junction between said flange (2) to be produced and said main body (1).

2. The determination method according to claim 1, characterized in that, The inflection points of each circumferential undulation (21, 22, 23, 24, 25) are comprised in the same circle.

3. The determination method according to claim 1 or 2, characterized in that, The minimum points of each circumferential undulation (21, 22, 23, 24, 25) are comprised in the same circle, the radius of which is greater than or equal to the radius of the circular arc (20) forming the junction between the first surface (100) and the second surface (200).

4. The determination method according to claim 1 or 2, characterized in that, The correction curvature (33) located at the maximum point of the circumferential undulation has a greater radius of curvature than the correction curvature (32) located at the inflection point of the circumferential undulation.

5. The determination method according to claim 1 or 2, characterized in that, The flange (2) to be produced comprises a fillet at the junction with the body (1) to be produced.

6. A method for manufacturing a composite material part (4), the part (4) comprising: A partially rotating main body (1), the main body having a axial direction (D) A A oriented axis (A) and having a direction along the axial direction (D) A Given one or more reference radii (R) R1 R R2 R R3 The main body (1) along the circumferential direction (D) C Locally around the axial direction (D) A ) extends; and includes at least one flange (2), said at least one flange extending from one end of the body (1) along the extending direction (D) E (Extended meaning: the method includes:) - depositing a plurality of fibrous layers by automatic placement of fibres on a covering mould (500) comprising a first covering surface and a second covering surface located in an extension of the first covering surface, the first and second covering surfaces respectively corresponding to the first surface (100) and the second surface (200) determined according to the method for determining the geometry of a covering mould according to any one of claims 1 to 5, the part of the blank (4b) produced on the first covering surface corresponding to the blank (1b) of the body, and the part of the blank (4b) produced on the second covering surface corresponding to the blank (2b) of the flange, - shaping said fibrous blank (4b) to obtain a fibrous preform (4d), said shaping comprising developing said main body blank (1 b) along said circumferential direction (D C ) to obtain a main body preform (1 d) having one or more reference radii (R R1 , R R2 , R R3 ) along said axial direction (D A ) and having the shape of the main body (1 ) to be produced, and shaping the flange blank (2b) to obtain a flange preform (2d) extending from an end of said main body preform (1 d) along said extension direction (D E ) and having the shape of the flange (2) to be produced, then - densifying the fibrous preform (4d) by matrix, thereby obtaining a composite part (4).

7. The production method according to claim 6, wherein The development of the body blank (1b) and the shaping of the flange blank (2b) are performed simultaneously.

8. The production method according to claim 6, wherein First, intermediate forming of the flange blank (2b) is performed to obtain a shape extending from the end of the main body blank (1b) along the intermediate extension direction (D). Pi The extended intermediate flange preform (2c), the intermediate extension direction (D) Pi ) and the axial direction (D) A The angle between them is smaller than the extension direction (D). P ) and the axial direction (D) A The angle between (D) and (D) is greater than the extension direction (D). E ) and the axial direction (D) A The angle between the two is then determined, and the unfolding of the main body blank is performed to obtain the main body preform, thereby performing the forming of the intermediate flange preform (2c) to obtain the extension direction (D) from the main body preform (1d). E A flange preform (2d) that extends and has the shape of the flange (2) to be produced.

9. A method for manufacturing a composite material part (40), the part (4) comprising: a fully revolved body having an axis (A) oriented in an axial direction, the body having one or more given reference radii, the body extending in a circumferential direction partially around the axial direction; and at least one flange extending from one end of the body in an extension direction, the method comprising: - producing a part section (4) comprising a partially revolved body section (1) having an axis oriented in an axial direction and having a given reference radius, the body section (1) extending in a circumferential direction partially around the axial direction, and at least one flange section (2) extending from one end of the body section (1) in an extension direction, the manufacturing of the part section (4) being performed according to the manufacturing method of any one of claims 6 to 8, - assembling the part section (4) to obtain a composite part (40) having a complete revolution. - depositing a plurality of fibrous layers by automatic placement of fibres on a covering mould (500) comprising a first covering surface and a second covering surface located in an extension of the first covering surface, the first and second covering surfaces respectively corresponding to the first surface (100) and the second surface (200) determined according to the method for determining the geometry of a covering mould according to any one of claims 1 to 5, the part of the blank (4b) produced on the first covering surface corresponding to the blank (1b) of the body, and the part of the blank (4b) produced on the second covering surface corresponding to the blank (2b) of the flange, - densifying the fibrous preform (4d) by matrix, thereby obtaining a composite part (4). The development of the body blank (1b) and the shaping of the flange blank (2b) are performed simultaneously. a fully revolved body having an axis (A) oriented in an axial direction, the body having one or more given reference radii, the body extending in a circumferential direction partially around the axial direction; and at least one flange extending from one end of the body in an extension direction, the method comprising: - producing a part section (4) comprising a partially revolved body section (1) having an axis oriented in an axial direction and having a given reference radius, the body section (1) extending in a circumferential direction partially around the axial direction, and at least one flange section (2) extending from one end of the body section (1) in an extension direction, the manufacturing of the part section (4) being performed according to the manufacturing method of any one of claims 6 to 8, - assembling the part section (4) to obtain a composite part (40) having a complete revolution.

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