Forming mold for preparing thin-wall composite material launching box and preparation method

Abstract

The invention relates to the technical field of unmanned aerial vehicle prevention and control systems, in particular to a forming die for preparing a thin-wall composite material launching box and a preparation method, the forming die comprises four square male dies, one side face of each male die is provided with a first forming groove, the other three side faces of each male die are provided with second forming grooves, and the forming die further comprises two side plates; the four male molds are spliced with the corresponding side plates through the positioning bulges, and every two adjacent second forming grooves define a first silica gel mold mounting cavity; the forming die further comprises a split female die arranged outside the male die in a surrounding mode, a second silica gel die installation cavity is defined by the second forming grooves without the adjacent second forming grooves and the inner wall of the split female die, and a third silica gel die installation cavity is defined by the first forming grooves and the inner wall of the split female die. A first silica gel male mold is mounted in the first silica gel mold mounting cavity, a second silica gel male mold is mounted in the second silica gel mold mounting cavity, and a third silica gel male mold is mounted in the third silica gel mold mounting cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicle prevention and control systems, and in particular to a molding die and a preparation method for preparing a thin-wall composite material launch box. Background Art

[0002] The storage and transportation launch box is a major component of the aircraft box-type launch technology and is often used for the storage, transportation and launch of aircraft. During daily storage, the storage and transportation launch box provides a good protective environment for the aircraft and seals and protects the aircraft. When working, it can quickly complete work instructions and improve the rapid response capability of the aircraft. Traditional launch boxes are generally made of metal or non-metallic materials. Among them, most metal launch boxes have complex molding processes, heavy weight and high prices, while non-metal launch boxes are mostly made of fiber-reinforced resin-based composite materials. The product manufacturing efficiency is high and it is suitable for mass and automated production.

[0003] In existing wars, drones are more active on the battlefield and can complete their reconnaissance and targeted strikes at a low cost. Therefore, anti-drone combat equipment has gradually become an area of ​​concern in the world. However, single launch box equipment is increasingly difficult to deal with swarm attacks, and the protection effect is low and the cost is high. Therefore, building an anti-drone system with multiple types of equipment has become an inevitable choice; parallel composite launch boxes are lighter, stronger, and more environmentally resistant than metal launch boxes. They avoid many problems such as deformation of thin-walled metal launch boxes after welding and serious guide rail precision errors. They are now increasingly used in the field of small aircraft box launches.

[0004] Therefore, in view of the above problems, the present invention urgently needs to provide a molding die and a preparation method for preparing a thin-walled composite material launch box. Summary of the invention

[0005] The technical problem solved by the present invention is to provide a molding mold and a preparation method for preparing a thin-walled composite launch box. The shrinkage and expansion characteristics of the silicone rubber mold effectively realize the integrated molding preparation of a common guide rail for a small-scale parallel launch cabin with multiple irregular cavity structures, making the molding mold easy to operate and able to effectively ensure the accuracy of each launch channel.

[0006] The present invention provides a forming mold for preparing a thin-wall composite material launch box, comprising four square male molds, one side surface of each male mold is provided with a first forming groove, and the other three sides are provided with a second forming groove, both ends of the first forming groove and the second forming groove respectively penetrate the front end surface and the rear end surface of the male mold, and the front end surface and the rear end surface of the male mold are respectively provided with positioning protrusions;

[0007] It also includes two side plates, on which are provided positioning grooves matching the positioning protrusions, and four male molds are assembled with the corresponding side plates through the positioning protrusions, so that after assembly, the four square male molds are surrounded to form a large square body, a first molding gap is provided between two adjacent male molds, and each two adjacent second molding grooves are surrounded to form a first silicone mold installation chamber;

[0008] It also includes a split female mold surrounded by the four male molds, a second molding gap is provided between the inner wall of the split female mold and the four male molds, a second molding groove without adjacent second molding grooves and the inner wall of the split female mold are surrounded to form a second silicone mold installation chamber, and the first molding groove and the inner wall of the split female mold are surrounded to form a third silicone mold installation chamber;

[0009] Among them, the first silicone mold installation cavity is installed with a first silicone positive mold, the second silicone mold installation cavity is installed with a second silicone positive mold, and the third silicone mold installation cavity is installed with a third silicone positive mold.

[0010] Preferably, the outer side surfaces of the two side plates extend horizontally with mounting shafts; and the mold frame is further included, with two placement grooves extending upward at both ends of the mold frame, and the mounting shafts are correspondingly placed in the placement grooves.

[0011] Preferably, a third molding gap is provided between the first silicone male mold, the second silicone male mold, the third silicone male mold and each male mold; wherein the width of the first molding gap and the second molding gap are both 1 mm, and the width of the third molding gap is 2 mm.

[0012] Preferably, the first silicone male mold, the second silicone male mold and the third silicone male mold are all two-component addition-type silicone conformable molds.

[0013] Preferably, each male mold and each split female mold are made of metal.

[0014] The present invention also provides a method for preparing a thin-wall composite material launch box, comprising the following steps:

[0015] 1) preparing a molding mold for preparing a thin-walled composite material launch box and preparing prepreg; covering the side surfaces of four male molds, four first silicone male molds, four second silicone male molds and four third silicone male molds with the prepreg respectively;

[0016] 2) Place two male molds covered with prepreg side by side, with the opening of each first molding groove facing downward, and install the first silicone male mold in two adjacent second molding grooves; Place two first silicone male molds in the second molding grooves with the openings of the two male molds facing upward respectively;

[0017] 3) Take another two male molds covered with prepreg, cover them above the two first silicone male molds respectively, and make the openings of the first molding grooves of the two male molds face upwards, and install the first silicone male molds in two adjacent second molding grooves;

[0018] 4) After installing each second silicone male mold in the remaining second molding groove, each third silicone male mold is installed in each first molding groove, the outer side of the male mold is covered with prepreg as a whole, and assembled with the two side plates through each positioning protrusion;

[0019] 5) Install a split female mold outside the prepreg, cure, and demould to obtain a thin-walled composite launch box.

[0020] Preferably, in step 4), after the prepreg is entirely paved, a plurality of circumferential reinforcing ribs are continuously paved outside the prepreg at intervals, the height of each circumferential reinforcing rib is 0.6 mm, and the width of each circumferential reinforcing rib is one of 120 mm, 150 mm and 180 mm.

[0021] Preferably, in step 1), after the prepreg is spread outside each male mold, vacuum pre-compaction is performed; in step 4), after the prepreg is spread on the entire outer side of the male mold, vacuum pre-compaction is performed; the vacuum degree is not less than -0.085MPa.

[0022] Preferably, in step 1), the thickness of the prepreg coated on the side surfaces of the four male molds, the four first silicone male molds, the four second silicone male molds and the four third silicone male molds is 1 mm; in step 4), the thickness of the prepreg coated on the outer side of the male mold as a whole is 2 mm;

[0023] The prepreg in step 1) is a T300-3K carbon fiber flame retardant prepreg with a single layer thickness of 0.15 mm, and the prepreg in step 4) is a T700-12K carbon fiber fabric prepreg with a single layer thickness of 0.25 mm.

[0024] Preferably, in step 5), the curing process is to heat to 80°C at a heating rate of 5°C / min and keep warm for 3 hours; heat to 150°C at a heating rate of 5°C / min and keep warm for 4 hours; after the insulation is completed, cool to 30°C and demould.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention provides a molding mold and a preparation method for preparing a thin-walled composite material launch box. A positive mold and a split negative mold made of metal material and a positive mold made of silicone material are used. Through the shrinkage and expansion characteristics of the silicone rubber mold, the integrated molding preparation of a common guide rail of a small-scale parallel launch cabin with multiple irregular cavity structures is effectively realized. The molding operation is convenient, the accuracy of the launch channel can be effectively guaranteed, and the mold is easy to demold from the product after the product is cured, which solves the problem of excessive straightness of the launch channel guide rail and low product qualification rate caused by the single launch cabin being molded separately and then molded again, and realizes the overall lightweight weight reduction demand of the box body; the parallel common guide rail cabin body makes full use of the effective space of the launch rack, improves the firepower density, broadens the defense field, and can effectively solve the needs of a large number of small and medium-sized unmanned aerial vehicles, high requirements for the multi-target engagement capability of the air defense system, and high firepower requirements; and the composite material box body uses a lightweight and high-strength carbon fiber material as the main bearing material, which reduces the weight of the box body while meeting the strength and stiffness of the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram (stereoscopic diagram) of a forming mold for preparing a thin-walled composite material launch box according to an embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram (cross-sectional view) of a forming mold for preparing a thin-walled composite material launch box according to an embodiment of the present invention;

[0029] Figure 3 is a structural schematic diagram (stereoscopic diagram) of a side panel according to an embodiment of the present invention;

[0030] Figure 4 It is a structural schematic diagram (stereoscopic diagram) of the male mold described in an embodiment of the present invention;

[0031] Figure 5 It is a structural schematic diagram (stereoscopic diagram) of a thin-walled composite material launch box according to an embodiment of the present invention;

[0032] Figure 6 It is a structural schematic diagram (cross-sectional view) of a thin-walled composite material launch box according to an embodiment of the present invention;

[0033] Figure 7 It is a production flow chart of the method for preparing the thin-walled composite material launch box described in an embodiment of the present invention.

[0034] Among them: 1. Side plate; 101. Positioning slide groove; 102. Mounting shaft; 2. Male mold; 201. First molding groove; 202. Second molding groove; 203. Positioning protrusion; 301. First silicone male mold; 302. Second silicone male mold; 303. Third silicone male mold; 4. Split female mold; 5. Mold frame; 6. Annular reinforcement ribs. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment provides a molding die for preparing a thin-wall composite material launch box, comprising four square male molds 2, one side of each male mold 2 is provided with a first molding groove 201, and the other three sides are provided with a second molding groove 202, both ends of the first molding groove 201 and the second molding groove 202 respectively penetrate the front end face and the rear end face of the male mold 2, and the front end face and the rear end face of the male mold 2 are respectively provided with positioning protrusions 203;

[0037] It also includes two side plates 1, on which are provided positioning grooves 101 matching the positioning protrusions 203, and four male molds 2 are assembled with the corresponding side plates 1 through the positioning protrusions 203, so that after assembly, the four square male molds 2 are surrounded to form a large square body, a first molding gap is provided between two adjacent male molds 2, and each two adjacent second molding grooves 202 are surrounded to form a first silicone mold installation chamber;

[0038] It also includes a split female mold 4 arranged outside the four male molds 2, a second molding gap is arranged between the inner wall of the split female mold 4 and the four male molds 2, a second molding groove 202 without adjacent second molding grooves 202 and the inner wall of the split female mold 4 are arranged to form a second silicone mold installation chamber, and the first molding groove 201 and the inner wall of the split female mold 4 are arranged to form a third silicone mold installation chamber;

[0039] The first silicone mold installation cavity is provided with a first silicone male mold 301 , the second silicone mold installation cavity is provided with a second silicone male mold 302 , and the third silicone mold installation cavity is provided with a third silicone male mold 303 .

[0040] The present invention provides a molding mold for preparing a thin-wall composite material launch box, which uses a positive mold and a split negative mold made of metal material and a positive mold made of silicone material, and effectively realizes the integrated molding preparation of a common guide rail of a small-scale parallel launch cabin with multiple irregular cavity structures through the shrinkage and expansion characteristics of the silicone rubber mold. The molding operation is convenient, and the accuracy of the launch channel can be effectively guaranteed. The mold is easy to demold from the product after the product is cured, which solves the problem of excessive straightness of the launch channel guide rail and low product qualification rate caused by the single molding of a single launch cabin and the secondary molding, and realizes the overall lightweight weight reduction demand of the box; the parallel common guide rail cabin makes full use of the effective space of the launch rack, improves the firepower density, broadens the defense field, and can effectively solve the large number of small and medium-sized unmanned aerial vehicles, and the high requirements for the multi-target engagement capability and firepower of the air defense system.

[0041] like Figure 1 As shown, the outer side surfaces of the two side plates 1 are horizontally extended with installation shafts 102; the mold frame 5 is also included, and two ends of the mold frame 5 are extended upward to form two placement grooves, and the installation shafts 102 are correspondingly placed in the placement grooves.

[0042] like Figure 2 As shown, a third molding gap is provided between the first silicone male mold 301, the second silicone male mold 302, the third silicone male mold 303 and each male mold 2; wherein the width of the first molding gap and the second molding gap are both 1 mm, and the width of the third molding gap is 2 mm.

[0043] In this embodiment, the first silicone male mold 301 , the second silicone male mold 302 and the third silicone male mold 303 are all two-component addition-type silicone conformable molds.

[0044] In the present invention, a two-component addition-type silicone conformable mold is used, and the expansion amount at a specific temperature is controlled according to the linear expansion rate of the rubber mold to ensure the thickness and shape of the guide rail cavity.

[0045] In this embodiment, the material of each male mold 2 and the split female mold 4 is metal.

[0046] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the present invention also provides a method for preparing a thin-wall composite material launch box, comprising the following steps:

[0047] 1) preparing a molding mold for preparing a thin-walled composite material launch box and preparing prepreg; covering the side surfaces of four male molds 2, four first silicone male molds 301, four second silicone male molds 302 and four third silicone male molds 303 with prepreg respectively;

[0048] 2) Place two male molds 2 covered with prepreg side by side, with the opening of each first molding groove 201 facing downward, and install the first silicone male mold 301 in two adjacent second molding grooves 202; Place two first silicone male molds 301 in the second molding grooves 202 with the openings of the two male molds 2 facing upward respectively;

[0049] 3) Take another two male molds 2 covered with prepreg, and cover them above the two first silicone male molds 301 respectively, and make the openings of the first molding grooves 201 of the two male molds 2 face upwards, and install the first silicone male molds 301 in two adjacent second molding grooves 202;

[0050] 4) After each second silicone male mold 302 is installed in the remaining second molding grooves 202, each third silicone male mold 303 is installed in each first molding groove 201, the outer side of the male mold 2 is covered with prepreg as a whole, and assembled with the two side panels 1 through each positioning protrusion 203;

[0051] 5) Install the split female mold 4 outside the prepreg, cure and demould, and obtain a thin-wall composite material launch box.

[0052] The invention provides a preparation method of a thin-wall composite material launch box, which uses a positive mold and a split negative mold made of metal material and a positive mold made of silicone material, and effectively realizes the integrated molding preparation of a common guide rail of a small-sized parallel launch cabin with multiple irregular cavity structures through the shrinkage and expansion characteristics of the silicone rubber mold. The molding operation is convenient, and the accuracy of the launch channel can be effectively guaranteed. The mold is easy to demold from the product after the product is solidified, which solves the problem of excessive straightness of the launch channel guide rail and low product qualification rate caused by the single launch cabin being molded separately and then molded again, and realizes the overall lightweight weight reduction demand of the box body; the parallel common guide rail cabin body makes full use of the effective space of the launch rack, improves the firepower density, broadens the defense field, and can effectively solve the needs of a large number of small and medium-sized unmanned aerial vehicles, and the requirements of high multi-target engagement capability and high firepower requirements for the air defense system; and the composite material box body uses a lightweight and high-strength carbon fiber material as the main bearing material, so that the weight of the box body is reduced while meeting the strength and stiffness of the box body.

[0053] In this embodiment, in step 4), after the prepreg is entirely paved, a plurality of annular reinforcing ribs 6 are continuously paved at intervals outside the prepreg, the height of each annular reinforcing rib 6 is 0.6 mm, and the width of each annular reinforcing rib 6 is one of 120 mm, 150 mm and 180 mm.

[0054] In the present invention, the annular reinforcing ribs 6 are distributed at non-uniform intervals in the projection direction of the box body, so as to improve the rigidity of the middle part of the box body.

[0055] In this embodiment, in step 1), after the prepreg is spread on the outside of each male mold 2, vacuum pre-compaction is performed; in step 4), after the prepreg is spread on the entire outside of the male mold 2, vacuum pre-compaction is performed; the vacuum degree is not less than -0.085MPa.

[0056] In this embodiment, in step 1), the thickness of the prepreg coated on the side surfaces of the four male molds 2, the four first silicone male molds 301, the four second silicone male molds 302 and the four third silicone male molds 303 is 1 mm; in step 4), the thickness of the prepreg coated on the outer side of the male mold 2 as a whole is 2 mm;

[0057] The prepreg in step 1) is a T300-3K carbon fiber flame retardant prepreg with a single layer thickness of 0.15 mm, and the prepreg in step 4) is a T700-12K carbon fiber fabric prepreg with a single layer thickness of 0.25 mm.

[0058] In the present invention, T300-3K carbon fiber flame retardant prepreg is used as the inner surface layer, which can meet the roughness requirements and ablation resistance requirements of the inner surface, while T700-12K carbon fiber fabric prepreg is used in other parts to control the cost.

[0059] In this embodiment, in step 5), the curing process is to heat the temperature to 80°C at a heating rate of 5°C / min and keep it warm for 3 hours; heat the temperature to 150°C at a heating rate of 5°C / min and keep it warm for 4 hours; after the insulation is completed, cool to 30°C and demold.

[0060] The present invention also provides an embodiment of a method for preparing a thin-wall composite material launch box, comprising the following steps:

[0061] 1) preparing a molding mold for preparing a thin-walled composite launch box, preparing T300-3K carbon fiber flame retardant prepreg and T700-12K carbon fiber fabric prepreg; using T700-12K carbon fiber fabric prepreg to spread on the side surface of each male mold 2 and the side surface of each first silicone male mold 301, second silicone male mold 302 and third silicone male mold 303, the spreading thickness is 1mm, after the spreading is completed, each male mold 2 is vacuumed to assist pre-compaction;

[0062] 2) Take one of the male molds 2, insert the positioning protrusion 203 into the positioning groove 101 at the lower left of the side plate 1, so that the first molding groove 201 of the male mold opens downward, take a first silicone male mold 301, and install it in the second molding groove 202 on the right side of the male mold 2;

[0063] 3) Take another male mold 2, place it side by side on the right side of the male mold 2 in step 2), and insert it with the side plate 1 through the positioning protrusion 203, so that the second molding groove 202 of the male mold 2 is buckled on the outside of the first silicone male mold 301 in step 2), and the first molding groove 201 of the male mold 2 opens downward; take two first silicone male molds 301, and place them in the second molding grooves 202 above the two male molds 2 respectively;

[0064] 4) Take the other two male molds 2, respectively snap them onto the two first silicone male molds 301 in step 3), insert them into the side plate 1 through the positioning protrusions 203, and make the first molding grooves 201 of the two male molds 2 open upward; take the remaining first silicone male mold 301, and install it in the second molding grooves 202 adjacent to the two male molds 2;

[0065] 5) After each second silicone male mold 302 is installed in the remaining second molding groove 202, each third silicone male mold 303 is installed in each first molding groove 201, T300-3K carbon fiber flame retardant prepreg is used to cover the outer side of all male molds 2 with a thickness of 2 mm. After the paving is completed, three circumferential reinforcing ribs 6 with a thickness of 0.6 mm are paved at unequal intervals, and the widths of each circumferential reinforcing rib 6 are 120 mm, 150 mm and 180 mm respectively;

[0066] 6) After paving, the whole is covered with a vacuum bag film for pre-compaction, and the vacuum degree is not less than -0.085MPa. After the vacuum pre-compaction is completed, the vacuum bag film and the sealing strip are removed, and the split female mold 4 is covered on the outside for vacuum curing. During curing, the temperature is increased to 80°C at a heating rate of 5°C / min, and the temperature is kept for 3h, and then the temperature is increased to 150°C at the same heating rate and kept for 4h. After the insulation is completed, the product is demoulded after cooling to 30°C to obtain a thin-walled composite launch box;

[0067] The thin-wall composite material launch box obtained by the present invention uses a lightweight and strong carbon fiber material as the main bearing material, which reduces the box weight by 40.9% while meeting the box strength and stiffness requirements.

[0068] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A forming die for preparing a thin-wall composite material launch box, characterized in that: It comprises four square male molds (2), each of which has a first molding groove (201) on one side surface and a second molding groove (202) on the other three sides, the first molding groove (201) and the second molding groove (202) having two ends respectively penetrating the front end surface and the rear end surface of the male mold (2), and the front end surface and the rear end surface of the male mold (2) are respectively provided with positioning protrusions (203); It also includes two side plates (1), on which are provided positioning grooves (101) matching the positioning protrusions (203), and four male molds (2) are assembled with the corresponding side plates (1) through the positioning protrusions (203), so that after assembly, the four square male molds (2) are arranged to form a large square body, a first molding gap is arranged between two adjacent male molds (2), and each two adjacent second molding grooves (202) are arranged to form a first silicone mold installation chamber; It also includes a split female mold (4) arranged outside the four male molds (2), a second molding gap is arranged between the inner wall of the split female mold (4) and the four male molds (2), a second molding groove (202) without adjacent second molding grooves (202) and the inner wall of the split female mold (4) are arranged to form a second silicone mold installation chamber, and the first molding groove (201) and the inner wall of the split female mold (4) are arranged to form a third silicone mold installation chamber; Wherein, a first silicone male mold (301) is installed in the first silicone mold installation cavity, a second silicone male mold (302) is installed in the second silicone mold installation cavity, and a third silicone male mold (303) is installed in the third silicone mold installation cavity.

2. The forming mold for preparing a thin-wall composite material launch box according to claim 1, characterized in that: The outer side surfaces of the two side plates (1) are horizontally extended with mounting shafts (102); the mold frame (5) is also included, and two placement grooves are provided at both ends of the mold frame (5) extending upward, and the mounting shafts (102) are correspondingly placed in the placement grooves.

3. The forming mold for preparing a thin-wall composite material launch box according to claim 2, characterized in that: A third molding gap is provided between the first silicone male mold (301), the second silicone male mold (302), the third silicone male mold (303) and each male mold (2); wherein the width of the first molding gap and the second molding gap are both 1 mm, and the width of the third molding gap is 2 mm.

4. The forming mold for preparing a thin-wall composite material launch box according to claim 3, characterized in that: The first silicone male mold (301), the second silicone male mold (302) and the third silicone male mold (303) are all two-component addition-type silicone conformable molds.

5. The forming mold for preparing a thin-wall composite material launch box according to claim 4, characterized in that: The material of each male mold (2) and the split female mold (4) is metal.

6. A method for preparing a thin-wall composite material launch box, characterized in that: The steps include: 1) preparing a molding mold for preparing a thin-walled composite material launch box as described in any one of claims 1 to 5, and preparing prepreg; covering the side surfaces of four male molds (2), four first silicone male molds (301), four second silicone male molds (302) and four third silicone male molds (303) with the prepreg respectively; 2) taking two male molds (2) covered with prepreg and placing them side by side so that the opening of each first molding groove (201) faces downward, installing the first silicone male mold (301) in two adjacent second molding grooves (202); placing two first silicone male molds (301) in the second molding grooves (202) with the openings facing upward of the two male molds (2); 3) taking another two male molds (2) covered with prepreg, and respectively covering the top of the two first silicone male molds (301), and making the openings of the first molding grooves (201) of the two male molds (2) face upward, and installing the first silicone male molds (301) in two adjacent second molding grooves (202); 4) After each second silicone male mold (302) is installed in the remaining second molding groove (202), each third silicone male mold (303) is installed in each first molding groove (201), the outer side of the male mold (2) is covered with prepreg as a whole, and assembled with the two side plates (1) through each positioning protrusion (203); 5) Installing a split female mold (4) outside the prepreg, curing and demoulding, and obtaining a thin-walled composite material launch box.

7. The method for preparing a thin-wall composite material launch box according to claim 6, characterized in that: In step 4), after the prepreg is entirely paved, a plurality of circumferential reinforcing ribs (6) are continuously paved at intervals outside the prepreg, wherein the height of each circumferential reinforcing rib (6) is 0.6 mm, and the width of each circumferential reinforcing rib (6) is one of 120 mm, 150 mm and 180 mm.

8. The method for preparing a thin-wall composite material launch box according to claim 7, characterized in that: In step 1), after the prepreg is spread on the outside of each male mold (2), vacuum pre-compaction is performed; in step 4), after the prepreg is spread on the entire outside of the male mold (2), vacuum pre-compaction is performed; the vacuum degree is not less than -0.085MPa.

9. The method for preparing a thin-wall composite material launch box according to claim 8, characterized in that: In step 1), the thickness of the prepreg coated on the side surfaces of the four male molds (2), the four first silicone male molds (301), the four second silicone male molds (302) and the four third silicone male molds (303) is 1 mm; in step 4), the thickness of the prepreg coated on the outer side of the male mold (2) is 2 mm; The prepreg in step 1) is a T300-3K carbon fiber flame retardant prepreg with a single layer thickness of 0.15 mm, and the prepreg in step 4) is a T700-12K carbon fiber fabric prepreg with a single layer thickness of 0.25 mm.

10. The method for preparing a thin-wall composite material launch box according to claim 9, characterized in that: In step 5), the curing process is to heat up to 80°C at a heating rate of 5°C / min and keep it warm for 3 hours; heat up to 150°C at a heating rate of 5°C / min and keep it warm for 4 hours; after the insulation is completed, cool to 30°C and demould.

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