A forming die for a circumferential hat-shaped stiffening frame of a composite material and a preparation method thereof

Abstract

The present invention provides a forming die for a composite circumferential hat-shaped stiffening frame and a preparation method thereof, relating to the technical field of forming dies for satellite structural parts. A forming die for a composite circumferential hat-shaped stiffening frame includes a bottom frame die, a split male die and an anti-punching mechanism; the bottom frame die is an annular structure with a certain thickness; the split male die includes a plurality of male die blocks, and the plurality of male die blocks are sequentially connected to the inner circumferential surface of the bottom frame die; one end of the anti-punching mechanism is connected to the top surface of the bottom frame die, and the other end abuts against the top surface of the split male die; the number of the anti-punching mechanisms is multiple. It solves the technical problems in the prior art that after the long strip-shaped hat-shaped ribs are assembled with the satellite bracket cylinder, the accuracy of the assembly surface is low, the assembly efficiency is low, the positioning accuracy is poor, and the composite circumferential hat-shaped stiffening frame cannot be formed in the circumferential direction. The present invention combines the bottom frame die, the split male die and the anti-punching mechanism, and after the product is formed, the fitting accuracy with the assembly surface of the satellite bracket cylinder is high, and the positioning accuracy is high.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite structural part forming molds, and particularly to a forming mold for a composite material circumferential hat-shaped stiffening frame and a preparation method thereof. Background Art

[0002] A satellite bracket is a key component of a satellite structure and the core of the overall satellite structure assembly. This load-bearing bracket is connected to an instrument mounting plate as the main structure of the satellite. On the one hand, it provides space and interfaces for the installation of propulsion system tanks, etc. On the other hand, it can also provide interfaces for the separation of the satellite from the launch vehicle and ground support equipment. At the same time, it can also provide benchmarks such as design, manufacturing, assembly, and precision measurement for the satellite structure, as well as support for testing and transportation.

[0003] Patent document CN113415001A discloses a forming tooling, a forming method, and a hat-shaped rib wall panel. A forming tooling includes: a die body, a soft film, a metal core mold, and a cover plate. The die body has a flat top panel, and a plurality of mutually parallel hat-shaped rib grooves are provided on the top panel of the die body. Both ends of each hat-shaped rib groove are connected with a snap ring fixing clip; the metal core mold is connected inside the soft film and penetrates through both ends of the soft film. The soft film and the metal core mold are both detachably connected in the hat-shaped rib grooves, and the metal core mold and the snap ring fixing clip are floatingly connected; the cover plate is detachably connected to the top surface of the die body, and the cover plate covers a plurality of hat-shaped rib grooves. This solution enables the co-curing forming of long strip-shaped hat-shaped ribs and the wall panel. The metal is used as the female mold, and the soft film is used as the male mold, and it is formed by hot expansion processing of the soft mold.

[0004] The currently used satellite brackets include a column section and a cone section. At this time, it is necessary to form a certain number of composite material hat-shaped stiffening frames in the circumferential direction of the column section and the cone section according to the load-bearing requirements. After assembling the existing long strip-shaped hat-shaped ribs with the satellite bracket cylinder, the matching accuracy of the assembly surface is low, the assembly efficiency is low, and the positioning accuracy is poor. The existing molds cannot form a ring-shaped stiffening frame structure, nor is there a forming method for the ring-shaped stiffening frame. Summary of the Invention

[0005] The purpose of the present invention is to provide a forming mold for a composite material circumferential hat-shaped stiffening frame to solve the technical problems existing in the prior art, such as the low matching accuracy of the assembly surface, low assembly efficiency, poor positioning accuracy after assembling the long strip-shaped hat-shaped ribs with the satellite bracket cylinder, and the inability to form a composite material hat-shaped stiffening frame in the circumferential direction.

[0006] The present invention also provides a preparation method for a composite material circumferential hat-shaped stiffening frame to solve the technical problem in the prior art that a composite material hat-shaped stiffening frame cannot be integrally formed in the circumferential direction.

[0007] A forming die for a composite material circumferential hat-shaped stiffening frame provided by the present invention comprises a bottom frame die, a split male die and an anti-punching mechanism;

[0008] The bottom frame die is an annular structure with a certain thickness;

[0009] The split male die comprises a plurality of male die blocks, and the plurality of male die blocks are sequentially connected to the inner circumferential surface of the bottom frame die;

[0010] One end of the anti-punching mechanism is connected to the top surface of the bottom frame die, and the other end abuts against the top surface of the split male die;

[0011] The number of the anti-punching mechanisms is multiple.

[0012] Furthermore, the cross section of the bottom frame die is a tapered shape with a narrower upper part and a wider lower part;

[0013] The cross section of the split male die is a tapered shape with a narrower upper part and a wider lower part adapted to the cross section of the bottom frame die.

[0014] Furthermore, a first mounting hole is provided on the side surface of the bottom frame die, and a second mounting hole is provided on the side surface of the split male die;

[0015] The first mounting hole and the second mounting hole are connected by a first locking member, so that the split male die is connected to the inner circumferential surface of the bottom frame die.

[0016] Furthermore, there is a certain gap between adjacent male die blocks.

[0017] Furthermore, the cross section of the anti-punching mechanism is ^-shaped.

[0018] Furthermore, a third mounting hole is provided on the top surface of the bottom frame die, and a fourth mounting hole is provided on one side of the top surface of the anti-punching mechanism;

[0019] The third mounting hole and the fourth mounting hole are connected by a second locking member, so that one side of the top surface of the anti-punching mechanism is connected to the top surface of the bottom frame die.

[0020] Furthermore, a fifth mounting hole is provided on the other side of the top surface of the anti-punching mechanism, a abutting member is connected in the fifth mounting hole, and the end of the abutting member abuts against the top surface of the split male die.

[0021] Furthermore, a lifting ring is connected to the bottom frame die.

[0022] A preparation method for a composite material circumferential hat-shaped stiffening frame provided by the present invention comprises the following steps:

[0023] Step 1: Die preparation

[0024] Clean the die, and apply a release agent to the surfaces of the bottom frame die and the male die blocks respectively;

[0025] Use a plurality of first locking members to sequentially connect a plurality of male die blocks to the inner circumferential surface of the bottom frame die in a circular order, so that the split male die is formed on the bottom frame die;

[0026] Step 2: Blanking

[0027] Cut and blank the carbon fiber epoxy unidirectional prepreg according to the size and laying sequence of the circumferential hat-shaped stiffening frame.

[0028] Step 3: First laying

[0029] Taking the circumferential direction of the above-mentioned mold as the 90° direction and the vertical direction as the 0° direction, symmetrically lay the carbon fiber epoxy unidirectional prepreg on the surface of the mold in the order of 45°, -45°, 0°, 90° cycles; when laying the prepreg, squeeze out the air brought into the layers; when butt-laying, stagger the butt joints for each layer.

[0030] Step 4: Compaction

[0031] Seal the whole mold with a vacuum bag, and then put it into an autoclave for pre-compaction according to the compaction system.

[0032] Step 5: Trimming

[0033] After the mold is pre-pressed, use the carbon fiber epoxy unidirectional prepreg to repair the defects on the surface of the product.

[0034] Step 6: Second laying

[0035] Taking the circumferential direction of the above-mentioned mold as the 90° direction and the vertical direction as the 0° direction, symmetrically lay the carbon fiber epoxy unidirectional prepreg on the surface of the mold again in the order of 45°, -45°, 0°, 90° cycles; when laying the prepreg, squeeze out the air brought into the layers; when butt-laying, stagger the butt joints for each layer.

[0036] Step 7: Curing

[0037] After the laying is completed, seal the whole mold with a packaging bag, and then put it into an autoclave for autoclave curing according to the curing system.

[0038] Step 8: Demolding

[0039] Remove the packaging bag and auxiliary materials on the surface of the mold, and disassemble the first locking part between the bottom frame mold and the split male mold.

[0040] Install the anti-pushing mechanism on the bottom mold frame with multiple second locking parts, and connect the abutting part in the fifth installation hole so that the end of the abutting part abuts against the top surface of the split male mold.

[0041] Use the anti-pushing mechanism to symmetrically and evenly separate the product from the bottom frame mold.

[0042] Then use a pin extractor to sequentially take out the male mold parts in the product and disassemble the split male mold.

[0043] At this time, the composite material circumferential hat-shaped stiffening frame can be manufactured.

[0044] Furthermore, the encapsulation bag includes a release cloth, a resin absorbent material, a non-porous isolation film, a breather felt, and a vacuum bag.

[0045] A forming mold for a composite material circumferential hat-shaped stiffening frame provided by the present invention has the following technical effects:

[0046] The bottom frame mold of the present invention adopts an annular structure with a certain thickness, which is convenient for the forming of the circumferential hat-shaped stiffening frame; the split male mold is composed of multiple male mold blocks sequentially connected to the inner circumferential surface of the bottom frame mold, which is convenient for disassembly after the product is formed; the outer end of the reverse jacking mechanism is connected to the top surface of the bottom frame mold, and the inner end abuts against the top surface of the split male mold, which is convenient for the demolding and forming of the product; multiple reverse jacking mechanisms are adopted to ensure the balanced force in the circumferential direction of the product. After the product of the present invention is formed, the circumferential hat-shaped stiffening frame has a high fitting accuracy with the assembly surface of the satellite support cylinder, good positioning accuracy, and meets the technical requirements for forming a composite material hat-shaped stiffening frame in the circumferential direction.

[0047] A preparation method for a composite material circumferential hat-shaped stiffening frame provided by the present invention successively adopts steps such as mold preparation, blanking, first layup, compaction, trimming, second layup, curing, and demolding, so that the circumferential hat-shaped stiffening frame is integrally hot-pressed and formed, ensuring that the circumferential hat-shaped stiffening frame after forming has a high fitting accuracy with the assembly surface of the satellite support cylinder, the forming method is simple, and the processing efficiency is high. Description of the Drawings

[0048] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 A schematic diagram of the use state of a forming mold for a composite material circumferential hat-shaped stiffening frame provided by an embodiment of the present invention;

[0050] Figure 2 A top view of a forming mold for a composite material circumferential hat-shaped stiffening frame provided by an embodiment of the present invention;

[0051] Figure 3 A bottom view of a forming mold for a composite material circumferential hat-shaped stiffening frame provided by an embodiment of the present invention;

[0052] Figure 4 A schematic diagram of the bottom frame mold provided by an embodiment of the present invention;

[0053] Figure 5 Schematic diagram of the split male mold provided by the embodiment of the present invention;

[0054] Figure 6 Schematic diagram of the male mold block provided by the embodiment of the present invention;

[0055] Figure 7 Schematic diagram of the reverse punching mechanism provided by the embodiment of the present invention;

[0056] Figure 8 Front view of the reverse punching mechanism provided by the embodiment of the present invention;

[0057] Figure 9 Flow chart of a preparation method of a composite material circumferential hat-shaped stiffening frame provided by the embodiment of the present invention;

[0058] Figure 10 Partial schematic diagram during encapsulation of the composite material circumferential hat-shaped stiffening frame provided by the embodiment of the present invention;

[0059] Figure 11 Structural schematic diagram of the composite material circumferential hat-shaped stiffening frame provided by the embodiment of the present invention.

[0060] Icon:

[0061] 100 - bottom frame mold; 200 - split male mold; 300 - reverse punching mechanism; 400 - composite material circumferential hat-shaped stiffening frame;

[0062] 101 - first mounting hole; 102 - first locking part; 103 - third mounting hole; 104 - second locking part; 105 - lifting ring; 106 - encapsulation bag;

[0063] 201 - male mold block; 202 - second mounting hole;

[0064] 301 - fourth mounting hole; 302 - fifth mounting hole; 303 - abutting part. Detailed implementation manners

[0065] Next, the technical solutions of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0066] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] As Figures 1 to 8 shown, a forming die for a composite material circumferential hat-shaped reinforcing frame provided in this embodiment includes a bottom frame die 100, a split male die 200, and an anti-pushing mechanism 300;

[0069] The bottom frame die 100 is an annular structure with a certain thickness;

[0070] The split male die 200 includes a plurality of male die blocks 201, and the plurality of male die blocks 201 are sequentially bolted to the inner peripheral surface of the bottom frame die 100;

[0071] The outer end of the anti-pushing mechanism 300 is bolted to the top surface of the bottom frame die 100, and the inner end abuts against the top surface of the split male die 200;

[0072] The number of the anti-pushing mechanisms 300 is multiple.

[0073] In the above embodiment, referring to Figure 4 , Figure 5 , the bottom frame die 100 is made of steel, and the split male die 200 is made of aluminum alloy to ensure high structural strength of the bottom die and the male die. The split male die 200 is divided into a plurality of male die blocks 201 according to the demolding angle. The anti-pushing mechanism 300 is a detachable connection structure, which is convenient for separating the product from the bottom frame die 100 by using the anti-pushing mechanism 300 after the product is formed.

[0074] The above connection structure of the present invention can efficiently manufacture the circumferential hat-shaped reinforcing frame, ensure the assembly accuracy of the assembled surface of the formed circumferential hat-shaped reinforcing frame and the satellite support cylinder, and the positioning is more accurate.

[0075] As a further improvement of this embodiment, referring to Figure 2 and Figure 3 , the cross-section of the bottom frame mold 100 is a conical shape that is narrow at the top and wide at the bottom;

[0076] The cross-section of the split male mold 200 is a conical shape that is narrow at the top and wide at the bottom and is adapted to the cross-section of the bottom frame mold 100.

[0077] In the above embodiment, both the bottom frame mold 100 and the split male mold 200 adopt a conical structure that is narrow at the top and wide at the bottom, so as to form the required circumferential hat-shaped strengthening frame structure, and the product has good formability and stability.

[0078] As a further improvement of this embodiment, referring to Figure 2 and Figure 4 and Figure 5 , the side surface of the bottom frame mold 100 is provided with a first mounting hole 101, and the side surface of the split male mold 200 is provided with a second mounting hole 202;

[0079] The first mounting hole 101 and the second mounting hole 202 are connected by a first locking member 102, so that the split male mold 200 is connected to the inner circumferential surface of the bottom frame mold 100.

[0080] In the above embodiment, both the first mounting hole 101 and the second mounting hole 202 are threaded through holes, and the first locking member 102 is a pin or a screw. The bottom frame mold 100 and the split male mold 200 are connected by a plurality of pins, so that there are a plurality of connection points between the bottom frame mold 100 and the split male mold 200, ensuring the firmness of the connection position between the bottom frame mold 100 and the split male mold 200.

[0081] As a further improvement of this embodiment, referring to Figure 5 and Figure 6 , there is a certain gap between adjacent male mold blocks 201, and the value range of this gap is between 0.5 mm and 1 mm, which is used to eliminate the circumferential expansion amount of the mold.

[0082] As a further improvement of this embodiment, referring to Figure 1 and Figure 7 and Figure 8 , the cross-section of the reverse top mechanism 300 is ^-shaped. So as to cooperate with the top surface of the bottom frame mold 100 and the top surface of the split male mold 2...

[0083] As a further improvement of this embodiment, referring to Figure 2 and Figure 4 and Figure 7 , the top surface of the bottom frame mold 100 is provided with a third mounting hole 103, and one side of the top surface of the reverse top mechanism 300 is provided with a fourth mounting hole 301;

[0084] ]>The third mounting hole 103 and the fourth mounting hole 301 are connected by a second locking member 104, so that the outer end of the top surface of the anti - top mechanism 300 is connected to the top surface of the bottom frame mold 100.

[0085] In the above - mentioned embodiment, both the third mounting hole 103 and the fourth mounting hole 301 are threaded through - holes, and the second locking member 104 is a pin or a screw. The outer end of the top surface of the anti - top mechanism 300 is fixed to the top of the bottom frame mold 100 by using a pin to fix the position of the outer end of the anti - top mechanism 300.

[0086] As a further improvement of this embodiment, referring to Figure 2 、 Figure 5 、 Figure 7 , a fifth mounting hole 302 is provided at the inner end of the top surface of the anti - top mechanism 300, and an abutting member 303 is connected in the fifth mounting hole 302. The end of the abutting member 303 abuts against the top surface of the split male mold 200.

[0087] In the above - mentioned embodiment, the fifth mounting hole 302 is a threaded through - hole. The abutting member 303 is a screw rod, and the bottom end of the screw rod has a flat structure and abuts against the top surface of the split male mold 200.

[0088] As a further improvement of this embodiment, referring to Figure 2 , a lifting ring 105 is connected to the bottom frame mold 100. The bottom frame mold 100 is provided with a threaded through - hole along the vertical direction, and the lifting ring 105 is connected in the threaded through - hole. Both the upper and lower ends of the lifting ring 105 are provided with lifting loops, which is convenient for lifting from the upper end or the lower end of the bottom frame mold 100.

[0089] The number of the lifting rings 105 is two, and the two lifting rings 105 are respectively connected to the opposite ends of the bottom frame mold 100. When lifting, the two lifting rings 105 are used to ensure the balance of the whole mold.

[0090] As Figure 9 shown, a preparation method of a composite material circumferential hat - shaped reinforcing frame provided by the present invention includes the following steps:

[0091] Step 1: Mold preparation

[0092] Clean the mold, and apply the release agent three times on the surfaces of the bottom frame mold 100 and the male module 201 respectively;

[0093] Use a plurality of first locking members 102 to connect a plurality of male modules 201 to the inner circumferential surface of the bottom frame mold 100 in a circular order in turn, so that the split male mold 200 is formed on the bottom frame mold 100;

[0094] The first locking member 102 is a pin or a screw;

[0095] Step 2: Blanking

[0096] According to the size and layup sequence of the circumferential hat-shaped stiffening frame, use an automatic cutting machine to cut the carbon fiber epoxy unidirectional prepreg;

[0097] Step Three: First Layup

[0098] Taking the circumferential direction of the above-mentioned mold as the 90° direction and the vertical direction as the 0° direction, symmetrically lay the carbon fiber epoxy unidirectional prepreg on the surface of the mold in the order of 45°, -45°, 0°, 90° cycle; when laying the prepreg, try to ensure compaction, and use an electric iron or a pressing plate to squeeze out the air brought into the layer; when butt-laying, stagger the butt joints for each layer;

[0099] Step Four: Compaction

[0100] Use a vacuum bag to encapsulate the whole mold, and then put it into a autoclave for pre-compaction according to the compaction system;

[0101] The compaction system is 90°C / 3h;

[0102] Step Five: Repair

[0103] After the mold is pre-pressed, use the carbon fiber epoxy unidirectional prepreg to repair the defects on the surface of the product;

[0104] The types of defects include: wrinkles, pits, protrusions, etc.;

[0105] Step Six: Second Layup

[0106] Taking the circumferential direction of the above-mentioned mold as the 90° direction and the vertical direction as the 0° direction, symmetrically lay the carbon fiber epoxy unidirectional prepreg on the surface of the mold again in the order of 45°, -45°, 0°, 90° cycle; when laying the prepreg, try to ensure compaction, and use an electric iron or a pressing plate to squeeze out the air brought into the layer; when butt-laying, stagger the butt joints for each layer;

[0107] Step Seven: Curing

[0108] As Figure 10 shown, after the layup is completed, use the encapsulation bag 106 to encapsulate the whole mold, and then put it into a autoclave for autoclave curing according to the curing system;

[0109] The curing system is 180°C / 3h;

[0110] The bleed material during curing generally uses materials such as filter paper and cotton paper;

[0111] Step Eight: Demolding

[0112] Remove the encapsulation bag 106 and auxiliary materials on the surface of the mold, and disassemble the first locking member 102 between the bottom frame mold 100 and the split male mold 200;

[0113] The above encapsulation bag 106 includes a release cloth, an adhesive absorbing material, a non-porous isolation film, a breathable felt, and a vacuum bag.

[0114] The anti-pushing mechanism 300 is installed on the bottom die frame 100 by using a plurality of second locking members 104. The abutting member 303 is connected in the fifth mounting hole 302, so that the end of the abutting member 303 abuts against the top surface of the split male mold 200.

[0115] The product is symmetrically and evenly separated from the bottom die frame 100 by using the anti-pushing mechanism 300.

[0116] Then, a pin extractor is used to sequentially remove the male mold blocks 201 in the product, and the split male mold 200 is disassembled.

[0117] At this time, the composite material circumferential hat-shaped reinforcing frame 400 can be obtained, as Figure 11 shown.

[0118] The preparation method of the composite material circumferential hat-shaped reinforcing frame provided by the present invention can form a composite material hat-shaped reinforcing frame in the circumferential direction, can meet the integral autoclave molding of the circumferential hat-shaped reinforcing frame, and ensure the fitting accuracy of the assembly surface between the hat-shaped reinforcing frame and the satellite support cylinder. The molding method of the present invention is simple in operation, high in molding efficiency, and accurate in product positioning after molding.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A forming die for a circumferential hat-shaped reinforcing frame of a composite material, characterized in that, It comprises a bottom frame mold (100), a split male mold (200) and a reverse top mechanism (300); The bottom frame mold (100) is an annular structure with a certain thickness; The split male mold (200) comprises a plurality of male modules (201), and the plurality of male modules (201) are sequentially connected to the inner circumference of the bottom frame mold (100); One end of the reverse top mechanism (300) is connected to the top surface of the bottom frame mold (100), and the other end abuts against the top surface of the split male mold (200); The number of the anti-top mechanisms (300) is multiple; The cross section of the bottom frame mold (100) is tapered, narrow at the top and wide at the bottom; The cross section of the split male mold (200) is a tapered shape that is narrow at the top and wide at the bottom, adapted to the cross section of the bottom frame mold (100); A first mounting hole (101) is provided on the side of the bottom frame mold (100), and a second mounting hole (202) is provided on the side of the split male mold (200); The first mounting hole (101) and the second mounting hole (202) are connected via a first locking member (102), so that the split male mold (200) is connected to the inner circumference of the bottom frame mold (100); There is a certain gap between adjacent male modules (201); The cross section of the anti-top mechanism (300) is ^-shaped; A third mounting hole (103) is provided on the top surface of the bottom frame mold (100), and a fourth mounting hole (301) is provided on one side of the top surface of the reverse top mechanism (300); The third mounting hole (103) is connected to the fourth mounting hole (301) via a second locking member (104), so that one side of the top surface of the reverse top mechanism (300) is connected to the top surface of the bottom frame mold (100); A fifth mounting hole (302) is provided on the other side of the top surface of the anti-top mechanism (300), and an abutment member (303) is connected inside the fifth mounting hole (302), and the end of the abutment member (303) abuts against the top surface of the split male mold (200).

2. The forming die of a composite material circumferential hat-shaped reinforcing frame according to claim 1, characterized in that, The bottom frame mold (100) is connected with a hanging ring (105).

3. A preparation method of a composite material circumferential hat-shaped stiffening frame, characterized in that, The steps include: Step 1: Mold preparation Clean the mold and apply a release agent on the surface of the bottom frame mold (100) and the male module (201); Using a plurality of first locking members (102), the plurality of male modules (201) are sequentially connected to the inner circumference of the bottom frame mold (100) in an annular order, so that the split male mold (200) is formed on the bottom frame mold (100); Step 2: Cutting Cut the carbon fiber epoxy unidirectional prepreg according to the size and layup sequence of the annular hat-shaped reinforcement frame; Step 3: First layering With the circumferential direction of the mold at 90° and the vertical direction at 0°, carbon fiber epoxy unidirectional prepreg is symmetrically laid on the mold surface in a cycle of 45°, -45°, 0°, and 90°. When laying the prepreg, the air introduced between the layers is squeezed out. When laying the layers together, the joints of each layer are staggered. Step 4: Compaction The mold is encapsulated as a whole in a vacuum bag, then placed in an autoclave and pre-compacted according to the compaction system; Step 5: Trimming After the mold is pre-pressed, carbon fiber epoxy unidirectional prepreg is used to repair defects on the product surface; Step Six: Second Layup Taking the circumferential direction of the above-mentioned mold as the 90° direction and the vertical direction as the 0° direction, symmetrically lay up the carbon fiber epoxy unidirectional prepreg on the surface of the mold again in the order of 45°, -45°, 0°, 90° cycles; when laying up the prepreg, squeeze out the air brought into the layers; when butting the layup, stagger the butt joints of each layer; Step Seven: Curing After the layup is completed, use the encapsulation bag (106) to encapsulate the whole mold, and then put it into the autoclave for autoclave curing according to the curing system; Step Eight: Demolding Remove the encapsulation bag (106) and auxiliary materials on the surface of the mold, and disassemble the first locking member (102) between the bottom frame mold (100) and the split male mold (200); Install the reverse jacking mechanism (300) on the bottom frame mold (100) by using a plurality of second locking members (104), and connect the abutting member (303) in the fifth mounting hole (302) so that the end of the abutting member (303) abuts against the top surface of the split male mold (200); Use the reverse jacking mechanism (300) to symmetrically and evenly separate the product from the bottom frame mold (100); Then use a pin extractor to sequentially take out the male mold blocks (201) in the product and disassemble the split male mold (200); At this time, the composite circumferential hat-shaped stiffening frame (400) can be obtained.

4. The preparation method of a composite material circumferential hat-shaped stiffening frame according to claim 3, characterized in that, The encapsulation bag (106) includes a release cloth, a glue absorbent material, a non-porous separator film, a breather felt, and a vacuum bag.

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