Manufacturing Method of Engine Casing

Abstract

The present invention relates to a manufacturing method of an engine casing. The manufacturing method includes: providing a cylindrical core mold (2); weaving a preform of the casing body (1a) on the circumferential surface of the core mold (2), the preform including a plurality of A yarns extending along the longitudinal direction of the core mold (2) and a plurality of B yarns extending along the circumferential direction of the core mold (2), and at least part of the A yarns extend axially beyond the end of the core mold (2) to reserve yarns for weaving the preform of the flanges (1b, 1c) of the casing; providing an outer mold (3) including a cylindrical part and a flange part connected to the end of the cylindrical part, and sleeving the outer mold (3) on the outside of the preform of the casing body (1a); and laying the yarns reserved for weaving the preform of the flanges (1b, 1c) radially (not excluding a laying path along a curve, such as a planar spiral) on the outer end surface of the flange part, and weaving the preform of the flanges (1b, 1c) of the casing.

Description

Technical Field

[0001] The present invention relates to the field of aero-engines, and more particularly to a manufacturing method for an engine casing. Background Art

[0002] There are a large number of high-speed rotating blades in the casing of an aero-engine (such as a gas turbine). In the case of foreign object impact, process defects, etc., the rotating blades in the casing may fall off. Therefore, it is required that the engine casing has good containment performance to ensure that high-speed and high-energy debris does not penetrate the casing and cause damage to equipment and personnel. After the blades fly off, there is a huge unbalanced load on the engine rotor, which will cause continuous vibration of the engine before shutdown. During this period, it is still required that the casing maintains a certain structural integrity and does not disintegrate.

[0003] At the same time, the engine casing is relatively large in size, and its weight will have a significant impact on the total weight of the engine, thereby affecting the engine efficiency. The low-temperature end casings in new-generation commercial engines generally use carbon fiber composite materials. Patent EP167244 proposes the use of a three-axis braided preform and a resin liquid molding process to manufacture an equal-thickness fan containment casing. Patent EP1674671 proposes a variable-thickness fan containment casing. The reinforcing phase of the composite casing is a circumferentially aligned and multi-layered stacked fabric, and the other composite layers are obtained by helically wound fabrics. Patent US8322971B2 proposes a composite containment casing. First, a variable-thickness fiber preform is processed by a three-dimensional weaving method, then a casing preform is obtained by laminating and winding on a core mold, and finally the casing is obtained by resin liquid molding.

[0004] The casing is generally of a circular ring structure, and flanges need to be provided at both ends in the axial direction of the circular ring. A number of bolt holes are provided on the flanges, and the flanges are fixed to other structures of the engine through bolts, thereby realizing the connection between the casing and other structures of the engine. For a composite fan containment casing, if the fibers in the flange area continue from the casing body, it will be beneficial to improve the connection reliability. In addition, the mechanical properties and containment performance of the casing are required to be relatively high. Generally, through continuous winding, the reinforcing fibers are continuous in the circumferential direction of the casing. However, regardless of whether the object of continuous winding (that is, the matrix carrying the wire to be wound) is a prepreg or a preform, the laying process is completed by helical winding, and it is impossible to achieve the end-to-end connection of the reinforcing fibers in the circumferential direction of the casing. Moreover, it is difficult to control the deformation of the prepreg or preform during the winding process, and problems such as wrinkles and fiber deflection are likely to occur, making it difficult to ensure the processing quality and qualification rate of the casing. More importantly, only by turning over the preform or prepreg can a fiber-continuous flange structure be formed after winding. However, the preform and prepreg themselves have relatively large stiffness, which is not only difficult to turn over, but also prone to forming wrinkle defects at the turning-over position, reducing the stiffness and strength of the structure.

[0005] In addition, if the preform is manufactured by a weaving process, it is made very long in the direction of the warp yarns, but the width in the direction of the weft yarns is often limited by the equipment and cannot be made very wide. Therefore, for the continuous winding of the woven preform, the direction of the warp yarns must be used as the circumferential direction of the casing and the flange. The bending angle of the warp yarns is usually greater than that of the weft yarns, which is not conducive to providing a high structural stiffness for the circumferential direction of the casing and the flange. Summary of the Invention

[0006] The present invention aims to provide a manufacturing method for an engine casing to improve the problem in the related art that it is difficult to turn over the preform to form a flange.

[0007] According to one aspect of an embodiment of the present invention, there is provided a manufacturing method for an engine casing, the manufacturing method comprising:

[0008] providing a cylindrical core mold;

[0009] weaving a preform of the casing body on the circumferential surface of the core mold, the preform of the casing body comprising a plurality of A yarns and a plurality of B yarns intersecting the A yarns, and at least part of the A yarns extending axially on the core mold beyond the end of the core mold to reserve yarns for weaving the preform of the flange of the casing;

[0010] providing an outer mold including a cylindrical portion and a flange portion connected to the end of the cylindrical portion, and sleeving the outer mold outside the preform of the casing body; and

[0011] laying the yarns reserved for weaving the preform of the flange on the outer end surface of the flange portion and weaving the preform of the flange of the casing.

[0012] In some embodiments, the manufacturing method further comprises, after weaving the preform of the flange of the casing:

[0013] fixing a mold at the axial end of the outer mold, the surface of the mold facing the preform of the flange of the casing having a cavity for forming the flange of the casing, and the cavity communicating with the cavity between the core mold and the outer mold to form a cavity adapted to the casing;

[0014] immersing resin in the cavity.

[0015] In some embodiments, the preform of the casing body and the preform of the flange are woven by a weaving process.

[0016] In some embodiments, the A yarns extend axially along the core mold.

[0017] In some embodiments, the A yarns are warp yarns.

[0018] In some embodiments, the preform of the casing body and the preform of the flange are woven by a braiding process.

[0019] In some embodiments, the A yarn is arranged parallel or helically with respect to the axial direction of the mandrel.

[0020] In some embodiments, the A yarn includes a first A yarn and a second A yarn, and the first A yarn and the second A yarn are arranged crosswise.

[0021] In some embodiments,

[0022] The thicknesses of the preform of the casing body at different positions in the axial direction of the mandrel are different.

[0023] The thicknesses of the flange at different positions in the radial direction are different.

[0024] In some embodiments, the preform of the casing body includes a plurality of preform layers arranged along the thickness direction, and the thicknesses of the preform layers at different positions in the axial direction of the mandrel are different.

[0025] In some embodiments, the preform of the casing body includes a plurality of preform layers arranged along the thickness direction, and the number of preform layers at different positions in the axial direction of the mandrel is different.

[0026] Applying the technical solution of the present invention, when weaving the preform of the casing body, the A yarn for weaving the flange is reserved, and after weaving the preform of the casing body, the preform of the flange is woven, so as to improve the problem that the preform is difficult to be turned over to form a flange in the related art.

[0027] Through the following detailed description of the exemplary embodiments of the present invention with reference to the drawings, other features and advantages of the present invention will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 The structural schematic diagram of an aeroengine casing manufactured by the manufacturing method of the aeroengine casing according to the embodiment of the invention is shown;

[0030] Figure 2 The cross-sectional structural schematic diagram of an aeroengine casing manufactured by the manufacturing method of the aeroengine casing according to the embodiment of the invention is shown;

[0031] Figure 3 The cross-sectional structural schematic diagram of another aeroengine casing manufactured by the manufacturing method of the aeroengine casing according to the embodiment of the invention is shown;

[0032] Figure 4 The structural schematic diagram of the core mold used in the manufacturing method of the engine casing according to an embodiment of the present invention is shown;

[0033] Figure 5 The schematic diagram of prefabricating the first layer of the core mold in the manufacturing method of the engine casing according to an embodiment of the present invention is shown;

[0034] Figure 6 The schematic diagram of prefabricating the first layer of the core mold in the manufacturing method of the engine casing according to another alternative embodiment of the present invention is shown;

[0035] Figure 7 The schematic diagram when preparing to manufacture the flange in the manufacturing method of the engine casing according to an embodiment of the present invention is shown;

[0036] Figure 8 The schematic diagram when manufacturing the flange in the manufacturing method of the engine casing according to an embodiment of the present invention is shown;

[0037] Figure 9 The schematic diagram of sealing the core mold, the outer mold and the preform to form the cavity required for the liquid molding process in the manufacturing method of the engine casing according to an embodiment of the present invention is shown;

[0038] Figure 10 The schematic diagram of the principle of changing the thickness by changing the yarn reserve amount or the yarn specification is shown. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0040] Figure 1 The structural schematic diagram of the engine casing manufactured by the manufacturing method of the engine casing according to an embodiment of the invention is shown; Figure 2 The cross-sectional structural schematic diagram of the engine casing manufactured by the manufacturing method of the engine casing according to an embodiment of the present invention is shown.

[0041] Combined with Figure 1 As shown, the engine casing includes a casing body 1a, a first flange 1b provided at the first end of the casing body 1a, and a second flange 1c provided at the second end of the casing body 1a.

[0042] Among them, both the casing body 1a and the flange include a preform woven from yarns and a resin attached to the preform.

[0043] As Figure 2 shown, the preform of the casing body 1a includes a plurality of preform layers arranged in the thickness direction, and the thickness of the preform layers at different positions in the axial direction of the core mold 2 is different. The casing 1 can be composed of several composite material layers 11, 12, 13 with similar differences in width (dimension along the axial direction of the casing), and at least one of the composite material layers contains a fiber preform. The fiber preform can be a woven preform, a braided preform, or a preform manufactured by other fabric processing methods. There are continuous fibers in the casing 1 that penetrate the casing body 1a from the first flange 1b to the second flange 1c. Whether it is a preform manufactured by a weaving process or a braiding process, the number or thickness (specification) of the yarns along the circumferential direction can be adjusted according to the size design of the casing to achieve the variable thickness characteristic of the composite material layer.

[0044] Regarding the thickness of the composite material layer, the thickness at different positions in one layer can be the same or vary greatly. Figure 2 The containment casing shown in the cross-section is composed of several composite material layers with large differences in width.

[0045] The method for manufacturing the engine casing is as follows: Figure 3 shown, the composite material layer 11a and the composite material layer 12a cover the casing body and the first and second flanges, and the width of the composite material layer 14 does not cover the flange area of the casing. The composite material layer 15 only covers the casing body 1a and is used to thicken the containment area and improve the containment capacity of the casing.

[0046] 1. Prepare continuous fiber yarns required for manufacturing the fiber preform according to design requirements. The fiber material can be any suitable fiber such as carbon fiber, glass fiber, aramid fiber, ultra-high molecular weight polyethylene, etc. The fiber yarn can be one or more of the above fibers. For example, carbon fiber yarn and aramid yarn are used simultaneously, or a yarn mixed with carbon fiber and aramid fiber is used; the number of fibers contained in the fiber yarn can be various, such as different specifications of carbon fibers such as 6K, 12K, 24K, etc. are used simultaneously.

[0047] 2. Prepare the core mold 2 for weaving the casing body 1a. As

[0048] shown and Figure 4 and 5As shown, the outer diameter of the core mold 2 is adapted to the inner diameter of the casing 1. The size design of the core mold 2 needs to consider necessary process errors and curing deformation of the composite material. For convenient demolding, the core mold 2 is a combined core mold, which is composed of multiple detachable core mold components. Specifically, the core mold 2 includes a first core mold component 21, a second core mold component 22, and a third core mold component 23 arranged side by side in the circumferential direction along the axis of the core mold 2. The first core mold component 21, the second core mold component 22, and the third core mold component 23 are assembled into a cylindrical or columnar integral core mold 2.

[0049] In some embodiments, one or more core mold components are partitioned according to the size and structural characteristics of the casing. Each partition of the core mold component can be obtained by integral machining or can be machined separately and then assembled and fixed. The length of the core mold is equal to the distance between the starting points of the flange corners at the front and rear ends. Before manufacturing the preform, it is necessary to assemble and fix the core mold components to form the combined core mold 2.

[0050] In some embodiments, the core mold 2 includes a cylindrical component surrounded by a metal layer, and this cylindrical component can be removed after the casing is formed. In other embodiments, the cylindrical component forms part of the casing.

[0051] In other embodiments, the core mold 2 includes a core mold matrix and a metal layer provided on the outer peripheral surface of the core mold matrix. After the casing is formed, the metal layer and the core mold matrix are removed together. In other embodiments, only the core mold matrix is removed after the casing is formed, and the metal layer forms part of the casing.

[0052] 3. Weave the preform of the casing body 1a on the circumferential surface of the core mold 2. The preform includes a plurality of A yarns and a plurality of B yarns that intersect with the A yarns. At least part of the A yarns extend axially on the core mold 2 beyond the end of the core mold 2 to reserve the yarns for weaving the preforms of the first flange 1b and the second flange 1c of the casing.

[0053] In some embodiments, the preforms of the casing body 1a and the flange are woven using a weaving process.

[0054] Figure 5 The structural schematic diagram of weaving the preform layer of the first-layer casing body 1a on the core mold 2 using a weaving process is shown. As Figure 5 shown, the A yarns 91, 92 extend along the axial direction of the core mold 2. The A yarns are warp yarns.

[0055] Weaving refers to the process in which warp yarns and weft yarns are interwoven perpendicular to each other to form a fabric.

[0056] Knitting refers to the process in which at least two groups of yarns are inclined and interwoven to form a fabric.

[0057] For the weaving process, in the fiber preform, all warp yarns extend along the axial direction of the mandrel 2, such as yarns 91 and 92. All weft yarns are continuously laid around the circumference of the mandrel 2, such as yarns 81, 82, and 83. The geometric relationship between the warp and weft yarns is like that of a flat woven fabric. Weaving a fabric that just covers the length of the mandrel 2 forms the innermost layer (the first layer), making the laying range of the weft yarns just reach the edge of the mandrel. For example, the weft yarns 82 and 83 just align with the edge of the mandrel 2.

[0058] Meanwhile, make at least a part of the warp yarns longer than the mandrel, such as warp yarns 91 and 92, where the lengths of yarns 91a and 92a reserved for the first flange 1b are provided, as well as the lengths of yarns 91b and 92b reserved for the second flange 1c. Fix the excess warp yarns at the front end 90a or the rear end 90b respectively as the first group of traction. Appropriate measures should be taken so that after fixing at both ends, a certain tension is still maintained in the warp yarns to avoid affecting subsequent processes.

[0059] In some other embodiments, the preforms of the casing body 1a and the flanges 1b and 1c are woven using the braiding process.

[0060] Figure 6 The structural schematic diagram shows the preform layer of the first - layer casing body 1a woven on the mandrel 2 using the braiding (such as hand - braiding) process.

[0061] For the braiding process, the braiding direction is the axial direction of the casing 1. The preform of the casing body includes yarns 81`, 82`, and 83` that extend along the circumference of the casing 1 to improve the circumferential stiffness and strength. Similar to the weft yarns in the weaving process, the laying range of the weft yarns just reaches the edge of the mandrel. For example, the yarns 82` and 83` just align with the edge of the mandrel. To enhance the strength in other directions, braiding yarns in other directions can be introduced, such as yarns 96 and 97 in one direction and yarns 98 and 99 in another direction. Among these yarns that do not extend along the circumference of the casing, all or part of the yarns reserved for forming the flanges are provided, such as the extended parts 96a and 97a of the yarns 96 and 97 that form the first flange 1b, and the extended part 96b of the yarn 96 that forms the second flange 1c. Similar to the weaving process, the excess yarns are fixed at the front end 90a` or the rear end 90b` respectively. Appropriate measures should be taken so that after fixing at both ends, a certain tension is still maintained in the warp yarns to avoid affecting subsequent processes. The subsequent process is similar to the weaving process. Therefore, only the implementation scheme of the weaving process will be described later.

[0062] Further, using the mandrel 2 wrapped with the first - layer fiber preform layer 110 as the mandrel, weave the second - layer fabric; similar to manufacturing the preform layer 110, use the reserved warp yarns as the second group and fix them at the front and rear ends of the casing respectively. Repeat this process until the number of preform layers required by the design is reached.

[0063] 4. Provide an outer mold 3 including a cylindrical portion and a flange portion connected to the end of the cylindrical portion, and sleuth the outer mold 3 over the preform of the casing body 1a.

[0064] As Figure 7 shown, design the outer mold 3 with the outer diameter of the casing body 1a as the inner diameter and in accordance with the inner sides of the mating flanges 1b and 1c. The design of the outer mold needs to consider necessary process errors and curing deformation of the composite material. The lengths of the two ends of the outer mold 3 and the first flange 1b and the second flange 1c are equal to the distance between the starting points of the front and rear flange corners. For easy demolding, the outer mold can adopt the form of the combined mold as Figure 3 shown, without excluding other feasible forms of the outer mold. The combined outer mold is composed of multiple detachable components 31 and 32. If necessary, partition one or more outer mold components according to the size and structural characteristics of the casing. Each partition of the outer mold component can be integrally processed or separately processed and then assembled and fixed. Before proceeding to the next step, assemble and fix the outer mold on the core mold and the preform.

[0065] 5. Lay the yarns of the preform with the reserved woven flanges 1b and 1c radially on the outer end faces of the flange portions, and weave the preforms of the flanges 1b and 1c of the casing.

[0066] As Figure 8 shown, release the fixation of the last group of reserved warp yarns, turn them over from the yarn leading-out positions along the outer mold end faces and along the radial direction of the casing so that they are radially distributed, such as 91a and 92a. As Figure 8 shown, introduce annular yarn layers with diameters corresponding to the flange positions, such as yarns 85 and 86, cover them on the radial yarns, and fix this layer of radial yarns and annular yarns in a manner that does not affect liquid molding, such as traction fixation, stitching, applying sizing agents, etc. In this way, one of the fiber preforms 130a and 130b required for manufacturing the flange areas 1b and 1c is formed.

[0067] 6. Repeat the previous step in the order from back to front until all the reserved groups of warp yarns are folded onto the core mold. Do not apply an annular yarn layer on the last layer of radial warp yarns, so as to form all the layers of fiber preforms required for the flange area.

[0068] 7. The fiber preforms in the flange area formed in steps 5 and 6 can be of equal thickness or variable thickness. Since the radius increases after turning over, the thickness of the fiber preform will naturally gradually decrease. Do not exclude adjusting the specifications or distribution densities of the radial yarns and annular yarns to make the thickness of the preform meet the design requirements.

[0069] 8. Then, use a rigid mold or flexible material to seal the core mold, outer mold, and preform to form a cavity required for the liquid molding process. The dimensional accuracy of the inner and outer diameters of the casing is controlled by the core mold and outer mold respectively. The fitting with the mold is ensured by the tension of the circumferential yarns. Subsequently, resin is introduced through liquid molding, cured, and demolded to obtain the casing part. Figure 9 The situation of using two rigid molds 4 and 5 at the first and second flanges is shown.

[0070] 9. It should be noted that the thickness of the casing body area may be different from that of the flange. In this regard, the thickness change from the casing body to the flange area can be achieved by changing the yarn reserve amount or yarn specification. As Figure 6 shown, the thickness of the casing body 1a` is significantly greater than that of the rear flange 1c`. The warp yarns 94` and 95` contain the redundant fibers 94b` and 95b` that form the flange, and the warp yarns 96` and 97` terminate at the flange corner area. In addition, the weft yarn 83` in the body area and the weft yarn 85` in the flange area have different specifications, which are reflected in different diameters, volumes, etc. In this way, two different thicknesses of the casing body and the flange area are achieved.

[0071] In this embodiment, the core mold 2 is designed with the inner diameter of the casing 1 as the outer diameter. The size of the core mold 2 takes into account the necessary process errors and the curing deformation of the composite material. The length of the core mold 2 is equal to the distance between the starting points of the first and second flange corners.

[0072] Using a weaving or braiding process, a two-dimensional or three-dimensional fabric is woven annularly on this core mold 2. If weaving is used, the warp yarns of the fabric are laid along the axial direction of the core mold, and the weft yarns are continuously laid around the circumference of the core mold. The geometric relationship between the warp and weft yarns is like that of a flat woven fabric. If braiding is used, the braiding direction is along the axial direction. The introduction of circumferential yarns is not excluded, and they are treated like the weft yarns in the case of weaving. The other braided yarns are treated like the warp yarns in the case of weaving.

[0073] Weave a fabric that just covers the length of the core mold to form the innermost layer (the first layer), so that the laying range of the weft yarns just reaches the edge of the core mold, and at the same time, the length of the warp yarns is greater than that of the core mold, reserving the yarns required for the flange. That is, the length of the warp yarns is equal to the sum of the length of the core mold and the lengths required for the two flanges. The extended warp yarns at this time are used as the first group for traction and fixation.

[0074] Take the core mold wrapped with the first layer of fabric as a whole to form a new core mold, and continue to weave the next layer (the second layer) of fabric, reserving the warp yarns required for the flange, and using them as the second group for traction and fixation. Proceed in this way gradually until the required thickness is accumulated. Design the forming outer mold / male mold with the outer diameter of the casing as the inner diameter, taking into account the necessary process errors and the curing deformation of the composite material. Its axial length is equal to the distance between the inner sides of the front and rear flanges.

[0075] Wrap the outer mold 3 around the preform and the core mold 2. Release the fixation of the last reserved set of warp yarns, turn them along the end face of the outer mold from the yarn lead-out positions of each yarn, so that they are radially distributed. Then introduce an annular yarn layer with a diameter equivalent to the flange position, covering the radial yarns. While providing circumferential reinforcement, ensure the thickness requirement of the flange. The annular yarn layer can only contain circumferential yarns or can have yarns in different directions to provide sufficient reinforcement in all directions. According to the flange design requirements, the annular yarn layer can have a variable thickness or an equal thickness along the radial direction. Fix this layer of radial yarns and annular yarns in a way that does not affect liquid molding, such as traction fixation, stitching, applying a setting agent, etc. Repeat the above process in the reverse order from the last set to the first set until all the excess yarns of all sets are folded onto the core mold. Do not apply an annular yarn layer on the last layer of radial yarns, thus forming the fiber preform required for manufacturing the flange area. If necessary, the innermost and outermost layers can be made of a two-dimensional biaxial woven tubular fabric with great stretchability, so that it extends to cover the surface of the flange as the surface protection layer of the whole formed component. Then use a rigid mold or a flexible material for sealing, and through the liquid molding process, cure and manufacture the composite material casing. For the convenience of installation and demolding, the core mold and the outer mold can be in the form of a combined mold, and other feasible mold schemes are not excluded.

[0076] The key innovation of this patent lies in: manufacturing the casing body and the flange edge preform in two steps. The first step: manufacture an annular woven preform that wraps the core mold for the casing body, and reserve enough warp yarns for weaving the flange edge, and fix them in groups according to each layer of the preform; The second step: install and fix the outer mold on the preform that wraps the core mold completed in the previous step, release the fixation of the warp yarns in reverse order, turn them along the end face of the outer mold from the lead-out positions of each warp yarn to form radial yarns, and apply annular yarns to form the preform required for manufacturing the composite material flange.

[0077] The above are only exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A manufacturing method of an engine casing, characterized in that Comprising: Providing a cylindrical core mold (2); Weaving a preform of the casing body (1a) on the circumferential surface of the core mold (2), the preform of the casing body (1a) comprising a plurality of A yarns and a plurality of B yarns intersecting with the A yarns, at least part of the A yarns extending axially on the core mold (2) beyond the end of the core mold (2) to reserve yarns for the preform of the flange (1b, 1c) of the woven casing; Providing an outer mold (3) comprising a cylindrical portion and a flange portion connected to the end of the cylindrical portion, and sleeving the outer mold (3) outside the preform of the casing body (1a); and Laying the yarns reserved for weaving the preform of the flange (1b, 1c) on the outer end surface of the flange portion, and weaving the preform of the flange (1b, 1c) of the casing, the preform of the flange (1b, 1c) of the woven casing comprising, from the yarn leading-out positions of the respective A yarns, adhering to the end surface of the outer mold and turning along the radial direction of the casing to be radially distributed, and introducing annular yarn layers (85, 86) having a diameter corresponding to the flange position.

2. The manufacturing method according to claim 1, characterized in that, Further comprising, after weaving the preform of the flange (1b, 1c) of the casing: Fixing molds (4, 5) at the axial ends of the outer mold (3), the surfaces of the molds (4, 5) facing the preform of the flange (1b, 1c) of the casing having cavities for forming the flange of the casing, the cavities communicating with the cavities between the core mold (2) and the outer mold (3) to form a cavity adapted to the casing; Infiltrating resin into the cavity.

3. The manufacturing method according to claim 1, characterized in that, Weaving the preform of the casing body (1a) and the preform of the flange (1b, 1c) by a weaving process.

4. The manufacturing method according to claim 3, characterized in that, The A yarns extend along the axial direction of the core mold (2).

5. The manufacturing method according to claim 3, characterized in that, The A yarns are warp yarns.

6. The manufacturing method according to claim 1, characterized in that Weaving the preform of the casing body (1a) and the preform of the flange (1b, 1c) by a braiding process.

7. The manufacturing method according to claim 6, characterized in that, The A yarns are arranged parallelly or spirally with respect to the axial direction of the core mold (2).

8. According to the manufacturing method of claim 6, characterized in that, The A yarns comprise first A yarns (96, 97) and second A yarns (98, 99), and the first A yarns (96, 97) and the second A yarns (98, 99) are arranged intersectingly.

9. The manufacturing method according to claim 1, wherein The thicknesses of the preform of the casing body (1a) at different positions in the axial direction of the core mold (1) are different, The thicknesses of the flange (1b, 1c) at different positions in the radial direction are different.

10. The manufacturing method according to claim 9, characterized in that, The preform of the casing body (1a) comprises a plurality of preform layers arranged in the thickness direction, and the thicknesses of the preform layers at different positions in the axial direction of the core mold (2) are different.

11. The manufacturing method according to claim 9, characterized in that, The preform of the casing body (1a) comprises a plurality of preform layers arranged in the thickness direction, and the number of preform layers of the preform at different positions in the axial direction of the core mold (2) is different.

Images