A device for forming a composite material for an outer casing

Abstract

The application provides a device for forming an outer containment casing composite material, and belongs to the technical field of composite material forming. The device comprises a support frame, a support cylinder and a forming cylinder. The forming cylinder is conical, and is used for laying the outer containment casing composite material. The two ends of the forming cylinder are fixed with the support cylinders. The outer periphery of the support cylinder is provided with a flange plate. The flange plate is arranged close to the two end faces of the forming cylinder. The flange plate is fixed on the end face of the forming cylinder through bolts. A gasket is clamped between the flange plate and the end face of the forming cylinder. The support frame is provided with two groups of rolling assemblies corresponding to the two support cylinders. The rolling assemblies are used for rotating the support cylinders on the support frame around the axis of the support cylinder. The support frame is provided with a fixing disc. The fixing disc is used for contacting the end face of one support cylinder which is away from the forming cylinder. The fixing disc and the end face of the support cylinder are detachably fixedly connected. The technical scheme improves the forming efficiency and quality of the outer containment casing composite material.

Description

Technical Field

[0001] This application relates to the field of composite material molding, and in particular to a composite material molding apparatus for outer bypass casings. Background Technology

[0002] The outer bypass casing of an aero-engine is a core component for achieving overall lightweighting, aerodynamic optimization, and improved structural reliability. The use of carbon fiber composite materials in integral circular molding has become the mainstream technology. The composite outer bypass casing is formed in a hot press furnace through cladding and curing. Its molding quality is highly dependent on the uniformity of the mold surface temperature, the density of the composite layer layup, and the stability of vacuum pressure holding. Existing composite material layup molds are mostly suitable for non-circular structures such as fan-shaped and semi-circular shapes, making it difficult to meet the requirements for integral circular layup and molding of engine outer bypass casings. Traditional integral circular molds have the following technical drawbacks: manual layup operation is inconvenient, easily leading to uneven composite layer layup and difficulty in eliminating interlayer air bubbles; the overall rigidity of the mold is insufficient, making it prone to warping and deformation after heating, resulting in difficulty in guaranteeing key dimensions such as casing diameter tolerance and cylindricity; axial dimension adjustment relies on cylinder grinding, which is a complex, time-consuming, and costly rework process. Summary of the Invention

[0003] In view of this, this application provides a molding apparatus for composite materials of outer bypass casing, which solves the problems in the prior art and improves the molding efficiency and quality of composite materials for outer bypass casing.

[0004] The technical solution provided in this application for a composite material molding device for outer bypass casing adopts the following:

[0005] A composite material molding apparatus for an outer bypass casing includes a support frame, a support cylinder, and a molding cylinder; The molding cylinder is conical and is used to lay the outer bypass casing composite material. Both ends of the molding cylinder are fixed with supporting cylinders. The supporting cylinders and the molding cylinder are coaxially arranged. A flange is sleeved on the outer periphery of the supporting cylinder. The flange is located near the two end faces of the molding cylinder. The flange is fixed to the end face of the molding cylinder by bolts, and a gasket is clamped between the flange and the end face of the molding cylinder. The support frame is provided with two sets of rolling assemblies corresponding to two support cylinders. The rolling assemblies are rotatably mounted on the support frame. The rolling structure of the rolling assemblies is used to support and contact the support cylinders. The rolling assemblies are used to make the support cylinders rotate around the axis of the support cylinders on the support frame. The support frame is provided with a fixing plate. The fixing plate is used to contact the end face of one support cylinder facing away from the forming cylinder. The fixing plate and the end face of the support cylinder are detachably and fixedly connected.

[0006] Optionally, each set of the rolling assembly includes two bearings, which are rotatably mounted on the support frame. The axis of rotation of the bearing is parallel to the axis of the forming cylinder. On the horizontal projection, the two bearings of each set of the rolling assembly are symmetrically arranged about the axis of the forming cylinder. The distance between the two bearings of each set of the rolling assembly is less than the diameter of the corresponding support cylinder. The support cylinder is placed on the rolling assembly.

[0007] Optionally, the outer periphery of the support cylinder is provided with an annular groove corresponding to the bearing, and the bearing rolls in the annular groove.

[0008] Optionally, the end of the support cylinder away from the forming cylinder is provided with a mounting edge that protrudes radially outward. The mounting edge is used to abut against the fixing plate. When the mounting edge abuts against the fixing plate, the axial direction of the forming cylinder is perpendicular to the fixing plate and parallel to the vertical direction. The fixing plate is provided with several clamping blocks that are spaced apart circumferentially. One end of the clamping block is fixed to the fixing plate by bolts, and the other end of the clamping block is used to press against the mounting edge.

[0009] Optionally, the support frame includes a bottom frame and a top frame, which are fixedly connected by a number of vertical support rods; the fixing plate is arranged in a ring shape, and the inner ring area of ​​the fixing plate corresponds to the hollow area of ​​the top frame. The hollow area and the interval between the bottom frame and the top frame serve as ventilation gaps. The fixing plate is provided with ventilation holes evenly distributed along the circumference, and the outer edge of the fixing plate is provided with a number of protrusions for installing the clamping block.

[0010] Optionally, the end face of the support cylinder facing away from the forming cylinder is provided with a positioning plate fixed on the support frame. The mounting edge of the support cylinder is provided with a plurality of positioning holes evenly distributed in the circumferential direction. The positioning holes are arranged along the axial direction of the support cylinder. The positioning plate is provided with a positioning shaft for inserting into the positioning hole.

[0011] Optionally, the support cylinder has a vent hole on the side wall between the contact rolling assembly and the flange. The vent hole penetrates the side wall of the support cylinder. The support cylinder has a vacuum pipe inside that communicates with the vent hole. The vacuum pipe is used to connect to a vacuum pumping device. The composite material molding apparatus for the outer bypass casing also includes a vacuum bag, which wraps around the outer periphery of the molding cylinder, the support cylinder, and the flange. The two ends of the vacuum bag are respectively sealed to the outer peripheral sidewalls of the two support cylinders. The sealing position of the vacuum bag and the support cylinder is located between the vent hole and the area of ​​the contact rolling assembly on the corresponding support cylinder.

[0012] Optionally, both ends of the formed cylinder are provided with annular connecting edges that protrude inward in the radial direction. The annular connecting edges are connected to the supporting cylinder. The formed cylinder, the supporting cylinder, and the annular connecting edges are integrally formed. The inner diameter of the supporting cylinder is smaller than the inner diameter of the connecting edge at the corresponding end, the outer diameter of the supporting cylinder is smaller than the outer diameter of the corresponding end side of the formed cylinder, and the inner diameter of the flange is smaller than the inner diameter of the corresponding end side of the formed cylinder.

[0013] Optionally, the formed cylinder, supporting cylinder, annular connecting edge, and flange are made of Q235A carbon structural steel.

[0014] Optionally, the outer periphery of the support cylinder is provided with rotation angle markings evenly distributed along the circumference, and a laying angle marking is provided on one side of the outer periphery of the support cylinder corresponding to each rotation angle marking.

[0015] In summary, this application includes the following beneficial technical effects: This application designs flanges and gaskets for the axial deformation of composite materials. By replacing gaskets of different thicknesses or adding / reducing gaskets, the distance between the flanges at both ends of the molding cylinder can be adjusted according to the deformation of the composite material, adapting to the axial deformation and shaping of the composite material, avoiding the need for grinding of the molding cylinder, greatly improving the efficiency of subsequent rework, and reducing the production cycle and cost.

[0016] The support cylinder of this application is supported by four rolling bearings to ensure its uniform rotation. The simple support structure allows the mold surface on the cylinder to rotate 360 ​​degrees during the composite layup stage. This greatly improves manual efficiency, and, in conjunction with manual and mechanical pressure rollers, can effectively eliminate interlayer air bubbles generated during composite layup.

[0017] The support frame and fixing plate of this application adopt a frame structure and an open design, which enables smooth heat convection in the hot press furnace, ensures uniform temperature distribution of the molding device, and improves molding quality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the composite material molding device for the outer bypass casing; Figure 2 This is a schematic diagram of a partial cross-sectional structure of the composite material molding device used for the outer duct casing.

[0020] Explanation of reference numerals in the attached drawings: 1. Support frame; 11. Bearing; 12. Bottom frame; 13. Top frame; 14. Ventilation gap; 2. Support cylinder; 21. Annular groove; 22. Mounting edge; 221. Positioning hole; 23. Vent hole; 24. Vacuum tube; 3. Molded cylinder; 31. Annular connecting edge; 4. Flange; 41. Gasket; 5. Fixing plate; 51. Clamping block; 52. Ventilation hole; 6. Positioning plate; 61. Positioning shaft; 7. Rotation angle mark; 71. Laying angle mark. Detailed Implementation

[0021] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0022] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0024] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0025] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the aspects described can be practiced without these specific details.

[0026] This application provides an apparatus for molding composite materials for outer casing.

[0027] like Figure 1 and Figure 2 As shown, a composite material molding device for an outer bypass casing includes a support frame 1, a support cylinder 2, and a molding cylinder 3. The molding cylinder 3 is conical and is used to lay the composite material of the outer casing. Supporting cylinders 2 are fixed to both ends of the molding cylinder 3. The supporting cylinders 2 and the molding cylinder 3 are coaxially arranged. A flange 4 is fitted around the outer periphery of the supporting cylinder 2. The flange 4 is located near the two end faces of the molding cylinder 3 and is fixed to the end face of the molding cylinder 3 by bolts. A gasket 41 is held between the flange 4 and the end face of the molding cylinder 3. The support frame 1 has two sets of rolling assemblies corresponding to the two supporting cylinders 2. The rolling assemblies are rotatably mounted on the support frame 1. The rolling structure of the rolling assemblies is used to support and contact the supporting cylinders 2. The rolling assemblies are used to rotate the supporting cylinders 2 around their axis on the support frame 1. A fixing plate 5 is provided on the support frame 1. The fixing plate 5 is used to contact the end face of one supporting cylinder 2 facing away from the molding cylinder 3, and the fixing plate 5 and the end face of the supporting cylinder 2 are detachably fixedly connected.

[0028] In this application, the molding cylinder 3 serves as the application area for the composite material of the outer casing. The supporting cylinders 2 at both ends, supported by rolling components, allow the molding cylinder 3 to rotate around its axis. During composite material application, the axis of the molding cylinder 3 is horizontal. The combination of manual and mechanical pressure rollers during application effectively eliminates interlayer air bubbles generated during composite material layering. The molding cylinder 3 of this application can withstand the pressure load during composite material layering. After each circumferential area is completed, the molding cylinder 3 and supporting cylinder 2 are rotated, with the unapplied area facing the operator, until all composite materials are applied. Then, the molding cylinder 3 and supporting cylinder 2 are rotated 90°, with their axes placed vertically on the fixed plate 5. After fixing the bottom supporting cylinder 2 to the fixed plate 5, the entire support frame 1, supporting cylinder 2, and molding cylinder 3 are placed in a hot press oven for pressure curing. This completes the curing of the outer casing composite material. This application designs flange 4 and gasket 41 for the axial deformation of composite materials. By replacing gasket 41 with gaskets of different thicknesses or adding / reducing gasket 41, the distance between flanges 4 at both ends of the molding cylinder 3 can be adjusted to accommodate the axial deformation and shaping of the composite material. This avoids grinding the molding cylinder 3, greatly improves the efficiency of later rework, and reduces the production cycle and cost.

[0029] In this embodiment, there are 12 gaskets 41, which are annular in shape and have openings for the flange 4 to pass through.

[0030] Each set of rolling components includes two bearings 11, which are rotatably mounted on the support frame 1. The axis of rotation of the bearing 11 is parallel to the axis of the forming cylinder 3. In the horizontal projection, the two bearings 11 of each set of rolling components are symmetrically arranged about the axis of the forming cylinder 3. The distance between the two bearings 11 of each set of rolling components is less than the diameter of the corresponding support cylinder 2, which is placed on the rolling components. The outer periphery of the support cylinder 2 is provided with annular grooves 21 corresponding to the bearings 11, and the bearings 11 roll in the annular grooves 21.

[0031] Both ends of the molded cylinder 3 are provided with radially protruding annular connecting edges 31. The annular connecting edges 31 are connected to the supporting cylinder 2. The molded cylinder 3, the supporting cylinder 2, and the annular connecting edges 31 are integrally formed. The inner diameter of the supporting cylinder 2 is smaller than the inner diameter of the corresponding connecting edge, and the outer diameter of the supporting cylinder 2 is smaller than the outer diameter of the corresponding end of the molded cylinder 3. The inner diameter of the flange 4 is smaller than the inner diameter of the corresponding end of the molded cylinder 3. In this application, the connection position between the annular connecting edges 31 and the molded cylinder 3 is chamfered inside the molded cylinder 3, and the connection position between the annular connecting edges 31 and the supporting cylinder 2 is also chamfered inside the supporting cylinder 2. In this application, the annular connecting edges 31 serve both as a structure connecting the supporting cylinder 2 and the molded cylinder 3 and as a reinforcing rib.

[0032] The support cylinder 2 of this application is supported by four rolling bearings 11 to ensure uniform rotation. This simple support structure allows the mold surface on the cylinder to rotate 360 ​​degrees during the composite layup stage. This significantly improves manual efficiency, and, in conjunction with manual and mechanical pressure rollers, effectively eliminates interlayer air bubbles generated during composite layup. The roller-type structure, with added reinforcing ribs on the inner wall, ensures that warping deformation caused by temperature changes is prevented, and that the key dimensions of the outer composite shell meet design requirements.

[0033] Considering the coefficient of thermal expansion of composite materials, the molded cylinder 3, supporting cylinder 2, annular connecting edge 31, and flange 4 described in this application are made of Q235A carbon structural steel. This grade of steel has excellent plasticity and toughness, and can withstand certain impacts and vibrations. After calculation, the profile is designed according to a scaling of 1 / 1000 of the theoretical model.

[0034] The supporting cylinder 2 has a radially outward protruding mounting edge 22 at one end away from the forming cylinder 3. The mounting edge 22 is used to abut against the fixing plate 5. When the mounting edge 22 abuts against the fixing plate 5, the axial direction of the forming cylinder 3 is perpendicular to the fixing plate 5 and parallel to the vertical direction. The fixing plate 5 has several clamping blocks 51 distributed circumferentially. One end of the clamping block 51 is fixed to the fixing plate 5 by bolts, and the other end of the clamping block 51 is used to press against the mounting edge 22.

[0035] Each end face of the supporting cylinder 2 facing away from the forming cylinder 3 is provided with a positioning plate 6 fixed to the support frame 1. The mounting edge 22 of the supporting cylinder 2 has several positioning holes 221 evenly distributed circumferentially. The positioning holes 221 are arranged along the axial direction of the supporting cylinder 2. The positioning plate 6 is provided with a positioning shaft 61 for inserting into the positioning hole 221, restricting the rotation of the forming cylinder 3 and stabilizing the angle of the forming cylinder 3 during installation. When the forming cylinder 3 is rotated, the positioning shaft 61 is disengaged from the positioning hole 221. The positioning plate 6 is fixed to the support frame 1 by bolts.

[0036] The outer circumference of the support cylinder 2 is provided with rotation angle markings 7 evenly distributed circumferentially. A laying angle marking 71 is provided on one side of the outer circumference of the support cylinder 2 corresponding to each rotation angle marking 7. In this application, to ensure the uniformity of composite material layup, during manual layup, based on the rotation angle markings 7 on the cylinder, starting from 0°, the positioning shaft 61 and the corresponding positioning hole 221, along with the angle markings, limit a total of four rotation angle markings 7: 0°, 90°, 180°, and 270°. Workers record the angle of each layer while rotating, ensuring that the composite material is accumulated layer by layer during layup. Furthermore, the laying angle marking 71 corresponding to each rotation angle marking 7 indicates the laying direction of the composite material at that circumferential angle, guiding the layup operation.

[0037] The support frame 1 includes a bottom frame 12 and a top frame 13, which are fixedly connected by several vertical support rods. The fixing plate 5 is arranged in a ring shape, and the inner ring area of ​​the fixing plate 5 corresponds to the hollow area of ​​the top frame 13. The hollow area and the interval between the bottom frame 12 and the top frame 13 serve as ventilation gaps 14. The fixing plate 5 has ventilation holes 52 evenly distributed around its circumference, and the outer edge of the fixing plate 5 has several protrusions for mounting the clamping blocks 51. The fixing plate 5 is fixed to the top frame 13 by welding or bolts.

[0038] The support frame 1 and the fixing plate 5 of this application adopt a frame structure and an open design, which enables smooth heat convection in the hot press furnace of the molding device, ensures the uniformity of temperature distribution of the molding device, and improves the molding quality.

[0039] The support cylinder 2 has a vent 23 on its side wall between the contact rolling assembly and the flange 4. The vent 23 penetrates the side wall of the support cylinder 2. The support cylinder 2 has a vacuum tube 24 inside that communicates with the vent 23. The vacuum tube 24 is used to connect to a vacuum pump. The outer casing composite material molding device also includes a vacuum bag. The vacuum bag wraps around the outer periphery of the molding cylinder 3, the support cylinder 2, and the flange 4. The two ends of the vacuum bag are respectively sealed to the outer periphery side walls of the two support cylinders 2. The sealing position of the vacuum bag and the support cylinder 2 is located between the vent 23 and the contact rolling assembly area on the corresponding support cylinder 2. In this application, the vacuum pump is a vacuum pump. Both support cylinders 2 are provided with vent 23 and vacuum tube 24. The outlet end of the vacuum tube 24 extends towards the end of the support cylinder 2 opposite to the molding cylinder 3.

[0040] In this application, the vacuum bag, vent 23, and vacuum tube 24, in conjunction with a vacuuming device, evacuate the composite material laying area from both ends of the molding device before it enters the hot press oven. This negative pressure ensures a tight bond between the composite material layers, resulting in a denser composite structure that more evenly distributes loads, improving the tensile strength and fatigue life of the outer casing. Furthermore, a valve is installed on the vacuum tube 24; after vacuuming, the valve is closed to maintain the composite material under negative pressure, ensuring pressure retention throughout the curing process.

[0041] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A molding apparatus for composite materials in outer bypass casings, characterized in that, It includes a support frame (1), a support cylinder (2), and a molded cylinder (3); The molding cylinder (3) is conical and is used to lay the outer casing composite material. Both ends of the molding cylinder (3) are fixed with supporting cylinders (2). The supporting cylinders (2) and the molding cylinder (3) are coaxially arranged. The supporting cylinder (2) is fitted with a flange (4) on its outer periphery. The flange (4) is located close to the two end faces of the molding cylinder (3). The flange (4) is fixed to the end face of the molding cylinder (3) by bolts. A gasket (41) is held between the flange (4) and the end face of the molding cylinder (3). The support frame (1) is provided with two sets of rolling components corresponding to the two support cylinders (2). The rolling components are rotatably mounted on the support frame (1). The rolling structure of the rolling components is used to support and contact the support cylinders (2). The rolling components are used to make the support cylinders (2) rotate around the axis of the support cylinders (2) on the support frame (1). The support frame (1) is provided with a fixing plate (5). The fixing plate (5) is used to contact the end face of one support cylinder (2) facing away from the forming cylinder (3). The fixing plate (5) and the end face of the support cylinder (2) are detachably fixedly connected.

2. The apparatus for molding composite materials for outer bypass casing according to claim 1, characterized in that, Each set of the rolling assembly includes two bearings (11), which are rotatably mounted on the support frame (1). The axis of rotation of the bearing (11) is parallel to the axis of the forming cylinder (3). On the projection of the horizontal plane, the two bearings (11) of each set of the rolling assembly are symmetrically arranged about the axis of the forming cylinder (3). The distance between the two bearings (11) of each set of the rolling assembly is less than the diameter of the corresponding support cylinder (2). The support cylinder (2) is placed on the rolling assembly.

3. The apparatus for molding composite materials for outer bypass casing according to claim 2, characterized in that, The outer periphery of the support cylinder (2) is provided with an annular groove (21) corresponding to the bearing (11), and the bearing (11) rolls in the annular groove (21).

4. The apparatus for molding composite materials for outer bypass casing according to claim 1, characterized in that, The supporting cylinder (2) has a mounting edge (22) that protrudes radially outward at one end away from the forming cylinder (3). The mounting edge (22) is used to abut against the fixing plate (5). When the mounting edge (22) abuts against the fixing plate (5), the axial direction of the forming cylinder (3) is perpendicular to the fixing plate (5), and the axial direction of the forming cylinder (3) is parallel to the vertical direction. The fixing plate (5) has a number of clamping blocks (51) that are spaced apart circumferentially. One end of the clamping block (51) is fixed to the fixing plate (5) by bolts, and the other end of the clamping block (51) is used to press against the mounting edge (22).

5. The apparatus for molding composite materials for outer duct casing according to claim 4, characterized in that, The support frame (1) includes a bottom frame (12) and a top frame (13), which are fixedly connected by a number of vertical support rods; the fixing plate (5) is arranged in a ring shape, and the inner ring area of ​​the fixing plate (5) corresponds to the hollow area of ​​the top frame (13). The hollow area and the interval between the bottom frame (12) and the top frame (13) serve as ventilation gaps (14). The fixing plate (5) is provided with ventilation holes (52) evenly distributed along the circumference, and the outer edge of the fixing plate (5) is provided with a number of protrusions for installing the clamping block (51).

6. The apparatus for molding composite materials for outer duct casing according to claim 4, characterized in that, The end face of the support cylinder (2) facing away from the forming cylinder (3) is provided with a positioning plate (6) fixed on the support frame (1). The mounting edge (22) of the support cylinder (2) is provided with a number of positioning holes (221) evenly distributed in the circumferential direction. The positioning holes (221) are arranged along the axial direction of the support cylinder (2). The positioning plate (6) is provided with a positioning shaft (61) for inserting into the positioning hole (221).

7. The apparatus for molding composite materials for outer bypass casing according to claim 1, characterized in that, The support cylinder (2) has a vent hole (23) on the side wall between the contact rolling assembly and the flange (4). The vent hole (23) penetrates the side wall of the support cylinder (2). The support cylinder (2) has a vacuum tube (24) inside that communicates with the vent hole (23). The vacuum tube (24) is used to connect to a vacuum pumping device. The composite material molding device for the outer bypass casing also includes a vacuum bag, which wraps around the outer periphery of the molding cylinder (3), the support cylinder (2) and the flange (4). The two ends of the vacuum bag are respectively sealed to the outer periphery sidewalls of the two support cylinders (2). The sealing position of the vacuum bag and the support cylinder (2) is located between the vent hole (23) on the corresponding support cylinder (2) and the area of ​​the contact rolling assembly.

8. The apparatus for molding composite materials for outer bypass casing according to claim 1, characterized in that, Both ends of the molded cylinder (3) are provided with annular connecting edges (31) that protrude inward in the radial direction. The annular connecting edges (31) are connected to the supporting cylinder (2). The molded cylinder (3), the supporting cylinder (2) and the annular connecting edges (31) are integrally formed. The inner diameter of the supporting cylinder (2) is smaller than the inner diameter of the connecting edge at the corresponding end. The outer diameter of the supporting cylinder (2) is smaller than the outer diameter of the corresponding end side of the molded cylinder (3). The inner diameter of the flange (4) is smaller than the inner diameter of the corresponding end side of the molded cylinder (3).

9. The apparatus for molding composite materials for outer bypass casing according to claim 8, characterized in that, The formed cylinder (3), the supporting cylinder (2), the annular connecting edge (31) and the flange (4) are made of Q235A carbon structural steel.

10. The apparatus for molding composite materials for outer duct casing according to claim 1, characterized in that, The outer periphery of the support cylinder (2) is provided with rotation angle marks (7) evenly distributed along the circumference, and the outer periphery of the support cylinder (2) is provided with a laying angle mark (71) on one side corresponding to each rotation angle mark (7).

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