Continuous forming device and process for ultra-long thin-wall composite material supporting structure

Abstract

The invention discloses a continuous forming device for an ultra-long thin-wall composite material supporting structure. The continuous forming device comprises an unwinding shaft, a prepreg shaping mold, a follow-up maintaining mold, a continuous curing mold, a cooling traction mold, a cutting and polishing module and a winding shaft which are sequentially arranged. The invention further discloses a continuous forming process of the ultra-long thin-wall composite material supporting structure, which comprises the following steps: the prepreg is unwound by an unwinding shaft and then enters a prepreg shaping mold, and the prepreg is changed from a plane state to a curved surface state; the follow-up maintaining mold clamps the prepreg at an outlet of the prepreg shaping mold and drives the prepreg to move to the continuous curing mold; the continuous curing mold is used for curing the prepreg; the cooling traction mold cools and drags the blank into the cutting and polishing module; the cutting and polishing module is used for cutting and polishing the blank; and the winding shaft is used for winding the product. High-precision, high-efficiency and high-mechanical-property forming of an ultra-long composite material structure is achieved, and the method has important guiding significance in the research aspect of deployable and retractable loads of spacecrafts.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials and relates to a continuous molding process for an ultra-long thin-wall composite material support structure. Background Art

[0002] The deployable payload of spacecraft is a form of satellite payload with high storage ratio and high precision. It is also an important way to realize the functions and performance of future super-large satellite payloads. The ultra-long thin-walled composite support structure is the core component of the deployable payload, which is used to support the deployment of super-large payloads in space and ensure the pointing accuracy of the payload. The support structure is a single-piece support structure with a length of 100 meters, ultra-lightweight and high rigidity. It is required to ensure that the thickness of a single support structure does not exceed 0.4mm and the straightness is better than 1mm / 10m. The continuous molding process must be used to achieve high-precision and high-strength integrated preparation of the ultra-long thin-walled composite support structure.

[0003] Existing composite materials structures are mostly formed by autoclave curing and static molding. For the molding of ultra-long thin-walled composite support structures, this process method has the following main problems:

[0004] (1) The molding size is limited by the size of the autoclave. The maximum molding size does not exceed the length of the autoclave cavity, which cannot meet the production requirements of a 100-meter-long support structure.

[0005] (2) The molding accuracy is poor. Currently, the prepreg is manually laid on the mold surface and then placed in an autoclave for curing and molding. The laying accuracy and mold thermal expansion will have a great impact on the product accuracy.

[0006] (3) The molding cost is relatively high. During the molding process of the supporting structure, a hot autoclave is required for curing, which results in high curing costs. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned defects and provide a continuous molding device and process for an ultra-long thin-walled composite support structure, which solves the technical problem that an ultra-long thin-walled composite support structure cannot be continuously molded with high precision. The present invention realizes the high-precision, high-efficiency, and high-mechanical-performance molding of ultra-long composite structures, and has important guiding significance in the research of the deployable and retractable load of spacecraft.

[0008] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0009] A continuous forming device for an ultra-long thin-wall composite material support structure, comprising an unwinding shaft, a prepreg shaping mold, a follow-up holding mold, a continuous curing mold, a cooling and pulling mold, a cutting and polishing module and a winding shaft, which are arranged in sequence;

[0010] The inlet end section of the prepreg shaping mold is a plane, and the outlet end section of the prepreg shaping mold is a curved surface matching the cross-sectional shape of the product, which is used to change the prepreg released from the unwinding shaft from a plane state to a curved surface state;

[0011] The inner cavity cross-sectional shape of the follow-up holding mold matches the cross-sectional shape of the product. The follow-up holding mold is used to clamp the prepreg at the outlet of the prepreg shaping mold and drive the prepreg to move to the continuous curing mold to achieve shape retention of the prepreg;

[0012] The cross-sectional shape of the inner cavity of the continuous curing mold matches the cross-sectional shape of the product and is used for curing the prepreg;

[0013] The cross-sectional shape of the inner cavity of the cooling and pulling mold matches the cross-sectional shape of the product, and is used to cool and pull the solidified blank to the cutting and grinding module;

[0014] The cutting and grinding module is used to cut and grind the blank according to the product design shape;

[0015] The take-up reel is used to wind the product.

[0016] Furthermore, the prepreg shaping mold is a gradual mold, the cross section of which gradually changes from a flat surface at the inlet end to a curved surface at the outlet end;

[0017] A plurality of pressing rollers are arranged above the prepreg shaping mold, and the prepreg released from the unwinding shaft is pressed against the upper surface of the prepreg shaping mold by the plurality of pressing rollers.

[0018] Furthermore, a single pressing roller in the plurality of pressing rollers is a spherical structure and is made of silicone rubber;

[0019] From the inlet end to the outlet end of the prepreg shaping mold, the arrangement of the pressure rollers is gradually denser, and the minimum pressure roller interval is not less than 100mm;

[0020] Each group of pressure rollers includes 3 to 5 silicone rubber rollers. The number of pressure rollers is smaller at the flat surface of the prepreg shaping mold, and the number of pressure rollers is larger at the surface with larger curvature. The pressing position of the pressure rollers is perpendicular to the surface, and there is rolling friction between the pressure rollers and the prepreg.

[0021] Furthermore, it also includes a deviation correction mechanism placed at one edge of the prepreg;

[0022] The deviation correction mechanism is located 40 to 60 mm in front of the unwinding shaft and is used to control the straightness of the prepreg during curing;

[0023] The deviation-correcting mechanism is located at the edge of the prepreg;

[0024] The sensor of the correcting mechanism is located at about 40 to 60 mm from the prepreg unwinding reel. An innovative edge-finding model is proposed. The sensor of the correcting mechanism is located at the edge of the prepreg. The two edges of the prepreg are cut neatly before laying to facilitate the subsequent edge-finding of the sensor.

[0025] A method for continuously forming an ultra-long thin-walled composite material support structure is implemented by using the above-mentioned ultra-long thin-walled composite material support structure continuous forming device, comprising:

[0026] S1 The prepreg is released from the unwinding shaft and enters the prepreg shaping mold, and the prepreg changes from a flat state to a curved state;

[0027] S2 follows the mold to clamp the prepreg at the exit of the prepreg shaping mold and drives the prepreg to move to the continuous curing mold;

[0028] S3 continuous curing mold cures the prepreg;

[0029] S4 cooling and pulling mold cools and pulls the solidified blank to the cutting and grinding module;

[0030] The S5 cutting and grinding module cuts and grinds the blank according to the product design shape;

[0031] The S6 reel winds the product.

[0032] Furthermore, in step S1, the unwinding tension of the unwinding shaft is not less than 20N, and the straightness control accuracy is better than ±1mm; the prepreg tensioning tension is not less than 20N; and the temperature of the prepreg shaping mold is 55-65°C.

[0033] Further, in step S3, the length of the continuous curing mold is not less than 1200 mm;

[0034] The continuous curing mold temperature is within 180℃;

[0035] The continuous curing mold adopts a pulsating opening and closing pressurized curing method: when the continuous curing mold is opened, the prepreg moves forward a predetermined distance a, and then the continuous curing mold is closed, and the continuous curing mold pressurizes and cures the prepreg for a time of t and a pressure of not less than 0.1MPa through its own material expansion; and then repeats the above pressurization process;

[0036] Assume that the length of the continuous curing mold (5) is L, the distance a is 200 to 300 mm, the time t is 20 to 30 min, and (L / a)×t≥120 min; wherein the distance and time have a certain relationship, to ensure that the total time of the product in the continuous curing mold is constant and the prepreg is completely cured, the formula satisfied is (L / a)×t≥120 min.

[0037] Furthermore, in step S2, the clamping force pressure of the follow-up mold is maintained at 0.1-0.3 MPa, and the temperature of the follow-up mold is maintained at 95-105°C.

[0038] Furthermore, in step S4, the temperature of the cooling and pulling mold is not greater than 100° C., and the clamping force is 0.1-0.3 MPa.

[0039] Furthermore, in step S2, when the continuous curing mold is opened, the follower mold is kept closed, the prepreg is clamped and moved forward, and after moving forward a distance a, the continuous curing mold is closed, the follower mold is kept open and returns to the original position;

[0040] Repeat the above steps to achieve the shape retention function of the prepreg;

[0041] In step S4, when the continuous solidification mold is opened, the cooling and pulling mold is closed, the blank is clamped and moved forward, and after moving forward a distance a, the continuous solidification mold is closed, and the cooling and pulling mold is opened and returned to the original position;

[0042] Repeat the above steps to achieve the cooling traction function.

[0043] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0044] (1) The present invention creatively proposes a method for forming a structure made of ultra-long thin-walled composite materials using a continuous molding process, thereby achieving high-precision, high-efficiency, and high-mechanical-performance molding of ultra-long composite materials;

[0045] (2) The continuous forming process adopted by the present invention solves the bottleneck that the ultra-long composite material support structure of 100 meters cannot be formed in an integrated manner, reduces the forming stress caused by thermal stress, and improves the overall mechanical properties;

[0046] (3) The present invention sets a pulsating opening and closing mold pressing curing method, which ensures the curing temperature, pressure and time of the ultra-long composite material support structure, and effectively improves the curing quality and the quality of integrated molding;

[0047] (4) The prepreg shaping process of the present invention innovatively designs a gradual shaping mold that transforms a plane into a curved surface, thereby ensuring that the prepreg is transformed from a plane into a curved surface after being unwound from the unwinding shaft. At the same time, multiple sets of pressing rollers are designed in the process. The pressing rollers avoid bending and angle changes of the prepreg fibers in the forward direction and the vertical forward direction, thereby preventing the prepreg fibers from affecting the product precision, thereby effectively improving the precision of the integrated molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of a continuous forming device for an ultra-long thin-wall composite material support structure of the present invention;

[0049] Figure 2 It is a schematic diagram of the Ω-type ultra-long thin-wall composite material support structure of the present invention. DETAILED DESCRIPTION

[0050] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0051] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0052] The present invention belongs to the field of composite materials and relates to a continuous molding process method for an ultra-long thin-walled composite material support structure. The continuous molding process method is mainly used in the field of ultra-long composite material support structures for spacecraft, and has good application value in the field of ultra-long thin-walled composite material support structures for spacecraft with deployable and retractable loads.

[0053] The ultra-long thin-walled composite material support structure 2 of the present invention is nearly 100 meters long, and its cross-sectional shapes include Ω-type, double Ω-type, C-type, herringbone, etc. The wall thickness of the support structure does not exceed 0.4 mm, and it can be expanded and folded. The expansion and folding ratio is 60:1. When expanded, the ultra-long thin-walled composite material support structure 2 is in a planar state, and when folded, the ultra-long thin-walled composite material support structure 2 is in a curved state. When expanded, the ultra-long thin-walled composite material support structure 2 is rod-shaped, and its cross-section is one of Ω-type, double Ω-type, C-type, and herringbone. When folded, the ultra-long thin-walled composite material support structure 2 is first flattened, and then wound on a cylindrical winding shaft, and it is in a cylindrical state. Figure 2 As shown, it is a schematic diagram of the Ω-shaped ultra-long thin-walled composite material support structure, with the left side showing the unfolded state and the right side showing the folded state.

[0054] In order to realize the continuous molding of the ultra-long thin-wall composite material support structure 2, the present invention first proposes a continuous molding device, such as Figure 1 , including an unwinding shaft 1, a prepreg shaping mold 3, a follow-up holding mold 4, a continuous curing mold 5, a cooling and pulling mold 6, a cutting and grinding module 7 and a winding shaft 8, which are arranged in sequence, and also includes a correction mechanism placed on one side of the prepreg;

[0055] The continuous molding process method of the present invention consists of the steps of prepreg unwinding, prepreg shaping, follow-up holding, continuous curing, cooling and traction, cutting and grinding, and product winding, and finally realizes the integrated continuous molding of a hundred-meter-level ultra-long thin-walled composite material support structure from prepreg to product.

[0056] The prepreg unwinding process is mainly to change the prepreg ply from a wound state to a straight state, accompanied by ply straightness control, the unwinding tension is not less than 20N, and the straightness control accuracy is ±1mm.

[0057] The prepreg shaping process mainly transitions the prepreg from a plane state to a product cross-section state. During the process, the prepreg ply is continuously pushed forward, and the tension of the prepreg is not less than 20N. The prepreg shaping mold 3 in this process is a gradient mold, which assists the prepreg ply to be transformed from a plane to a product cross-section. At the same time, there are multiple sets of rollers with a certain elasticity on the mold. Multiple sets of spherical silicone rubber rollers, in which the arrangement of the rollers gradually becomes denser during the entire process from the plane of the shaping mold to the curved surface, and the minimum roller spacing is not less than 100mm; each set of rollers includes 3 to 5 silicone rollers, the number of rollers at the flat curved surface is less, and the number of rollers at the curved surface with a larger curvature is more, and the pressing position of the rollers is ensured to be perpendicular to the curved surface to ensure that the prepreg is firmly attached to the mold; in addition, rolling friction must be ensured between the rollers and the prepreg. The distribution of the pressure rollers in the forward direction and the vertical forward direction is obtained through process simulation calculations. The main purpose is to ensure that the prepreg moves stably on the curved surface with minimal stress, so that the prepreg layer is firmly attached to the mold. A heating device is provided under the mold to ensure that the mold temperature is 60±5℃.

[0058] The follow-up holding process mainly involves the follow-up holding mold 4 clamping the prepreg that has become the product cross-section state, driving the prepreg ply forward and sending it to the interface of the next process. The clamping force pressure is maintained at 0.1MPa, the forward distance is 200-300mm, the dwelling time after forward is 20-30min, and the mold temperature is 100±5℃, ensuring that the prepreg ply maintains the product shape before curing and reduces the curing stress.

[0059] The continuous curing process mainly cures the prepreg into a continuous curing shape. The prepreg ply enters a continuous curing mold 5 that is consistent with the cross-sectional shape of the product. The mold is then expanded and pressurized by its own material. The pressure is not less than 0.1MPa. The temperature of the mold is controlled within 180°C. The mold length is not less than 1200mm. This length ensures that the prepreg is completely cured in the curing mold, that is, there is a certain relationship between the distance and time, ensuring that the total time of the product in the continuous curing mold is certain, ensuring that the prepreg is completely cured, and the formula satisfied is a*t≥1200mm. After curing for 10 minutes, the pressure is removed, the product is pushed forward 200-300mm, and then continues to heat and cure until the product completely passes through the entire length of the mold.

[0060] The cooling and traction process mainly pulls the solidified product to the interface of the next process. The solidified product enters the cooling and traction mold 6, and is pulled to the interface of the next process as it cools. The temperature of the cooling and traction process is 100°C, the clamping force is controlled at 0.1MPa, the forward distance is 200-300mm, and the time is 20-30mm.

[0061] The cutting and grinding process is mainly for post-processing of the product to meet the requirements of product use.

[0062] The winding process mainly involves winding the product on the winding shaft 8 for easy storage and transportation, and then unfolding it for subsequent use.

[0063] The specific steps are as follows:

[0064] (1) Prepreg unwinding

[0065] The prepreg rolls that have completed continuous plying are loaded on the unwinding shaft 1, and the front 20m prepreg is pulled out and gradually passes through each module in the molding process, and then fixed on the reel 8, and tension is given at the same time to ensure that the prepreg is taut. The prepreg is unwound on the unwinding shaft through the tensioning force, and the straightness of the unwinding prepreg is adjusted by the correction mechanism at about 50mm from the unwinding shaft to ensure that the straightness of the product meets the requirements when it is cured.

[0066] (2) Prepreg shaping

[0067] After the prepreg is released, it enters the prepreg shaping mold 3. The shaping mold can gradually transform the prepreg from a flat state to a curved surface state of the product cross section. The shaping mold has tensioning force before and after to ensure the angle of the prepreg fibers. At the same time, the shaping mold has a heating function, and the heating temperature does not exceed 80°C, so that the resin in the prepreg has a certain fluidity and reduces the stress of the curved surface. Multiple sets of pressure rollers are added above the shaping mold. The pressure rollers are made of expanded rubber materials, which can not only make the prepreg close to the shaping mold, but also ensure that the prepreg is flat in the width direction.

[0068] (3) Follow-up hold

[0069] After the prepreg is shaped in the shaping mold, it enters the follow-up holding mold 4. The follow-up holding mold has the same cross-section as the product and has heating and pressurizing functions. The heating function is to make the resin reach the gel point and position the shape; the pressurizing function is to make the soft prepreg maintain the cross-sectional shape of the product through the mold shape, and then the prepreg in this shape is sent to the curing mold for curing.

[0070] (4) Continuous curing

[0071] The prepreg is fed into the continuous curing mold 5 by the follow-up holding mold 4. The curing mold adopts a pulsating opening and closing pressurized curing method. The curing mold is divided into an upper and lower part. The prepreg is located between the upper and lower parts of the mold. When the mold is opened, the prepreg is driven forward 200mm by the tension, and then the mold is closed. By regulating the pulsating rhythm and the mold length, it is ensured that each part of the prepreg takes 120 minutes to complete the entire curing mold (it takes 120 minutes for the prepreg to be fully cured, so it is necessary to ensure that it is kept in the entire curing mold for 120 minutes), thereby realizing continuous curing of the prepreg.

[0072] (5) Cooling traction

[0073] The product after solidification enters the cooling and pulling mold 6. The cooling and pulling mold has the same structure as the solidification mold, with a length of about a (to ensure consistency with the forward distance). Its heating temperature does not exceed 100°C. When the solidification mold is opened, the cooling and pulling mold is closed to clamp the product and pull the product forward. The forward distance each time is 200 to 300 mm. Then the solidification mold is closed, the cooling and pulling mold is opened, and it returns to its original position to carry out the next cycle. Its functions are to slowly cool down the product to reduce the thermal stress of the product, and to maintain the cross-sectional shape of the product to prevent sudden cooling from causing changes in the cross-sectional shape of the product.

[0074] (6) Cutting, grinding and winding

[0075] After that, the product enters the cutting and polishing device, where the flash of the product is cut off, the gluing area of ​​the product is polished, and then the product is wound up (the product is first flattened, and then the process edges are cut and the gluing area is polished in this module, and then it is rolled up in the winding mechanism, which is fixed on the continuous forming equipment, including magnetic powder and reel. The winding mechanism here has the same structure as the unwinding mechanism, but the direction of rotation is different. After the product is wound up, the core shaft can be removed and placed on the unwinding shaft for subsequent gluing assembly) for easy storage.

[0076] Example:

[0077] like Figure 1 As shown, it is a schematic diagram of a continuous forming device, which assists in the implementation of the continuous forming process of an ultra-long thin-walled composite material support structure.

[0078] First, the prepreg rolls that have completed continuous plying are loaded on the unwinding shaft, and the front 20m prepreg is pulled out and gradually passes through each module in the molding process, and then fixed on the reel, and tension is given at the same time, and the prepreg is unwound on the unwinding shaft through tension. After the prepreg is released, it enters the shaping mold to transform the prepreg from a flat surface to a curved surface. Then it enters the follow-up holding mold, and the cross-section of the follow-up holding mold is consistent with the cross-section of the product.

[0079] The prepreg of this shape is then sent to the curing mold for curing. The cured product enters the cooling and traction mold. When the curing mold is opened, the cooling and traction mold is closed, the product is clamped and pulled forward, and the forward distance each time is 200 to 300 mm. Then the curing mold is closed, the cooling and traction mold is opened, and it returns to its original position for the next cycle.

[0080] Finally, the product enters the cutting and grinding device to cut off the flash of the product, grind the glued area of ​​the product, and then the product is rolled up for easy storage.

[0081] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0082] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A continuous forming device for an ultra-long thin-walled composite material support structure, characterized in that: It comprises an unwinding shaft (1), a prepreg shaping mold (3), a follow-up holding mold (4), a continuous curing mold (5), a cooling and pulling mold (6), a cutting and polishing module (7) and a winding shaft (8) which are arranged in sequence; The inlet end section of the prepreg shaping mold (3) is a plane, and the outlet end section of the prepreg shaping mold (3) is a curved surface that matches the cross-sectional shape of the product, and is used to change the prepreg released from the unwinding shaft (1) from a plane state to a curved surface state; The inner cavity cross-sectional shape of the follow-up holding mold (4) matches the cross-sectional shape of the product. The follow-up holding mold (4) is used to clamp the prepreg at the outlet of the prepreg shaping mold (3) and drive the prepreg to move to the continuous curing mold (5) to achieve shape retention of the prepreg; The inner cavity cross-sectional shape of the continuous curing mold (5) matches the cross-sectional shape of the product and is used for curing the prepreg; The cross-sectional shape of the inner cavity of the cooling and pulling mold (6) matches the cross-sectional shape of the product, and is used to cool and pull the solidified blank into the cutting and grinding module (7); The cutting and polishing module (7) is used to cut and polish the blank according to the product design shape; The reel (8) is used to reel the product.

2. The continuous forming device for an ultra-long thin-walled composite material support structure according to claim 1, characterized in that: The prepreg shaping mold (3) is a gradual mold, the cross section of which gradually changes from a flat surface at the inlet end to a curved surface at the outlet end; A plurality of groups of pressing rollers are arranged above the prepreg shaping mould (3), and the prepreg released from the unwinding shaft (1) is pressed against the upper surface of the prepreg shaping mould (3) by the plurality of groups of pressing rollers.

3. The continuous forming device for an ultra-long thin-walled composite material support structure according to claim 2, characterized in that: A single roller in the multiple sets of rollers is a spherical structure made of silicone rubber; From the inlet end to the outlet end of the prepreg shaping mold (3), the arrangement of the pressing rollers is gradually denser, and the smallest interval between the pressing rollers is not less than 100 mm; Each group of pressing rollers includes 3 to 5 silicone rubber rollers. The number of pressing rollers is relatively small at the gently curved position of the prepreg shaping mold (3), while the number of pressing rollers is relatively large at the position with a larger curvature of the curved surface. The pressing position of the pressing rollers is perpendicular to the curved surface, and rolling friction occurs between the pressing rollers and the prepreg.

4. The continuous forming device for an ultra-long thin-walled composite material support structure according to claim 1, characterized in that: It also includes a deviation correction mechanism placed at the edge of one side of the prepreg; The deviation correction mechanism is located 40 to 60 mm in front of the unwinding shaft (1) and is used to control the straightness of the prepreg during curing; The guiding mechanism is located at the edge of the prepreg.

5. A method for continuous molding of an ultra-long thin-walled composite material support structure, characterized in that: The method is implemented by using a continuous forming device for an ultra-long thin-walled composite material support structure as described in any one of claims 1 to 4, comprising: S1 prepreg is unwound from an unwinding shaft (1) and enters a prepreg shaping mold (3), and the prepreg changes from a flat state to a curved state; The S2 follower holding mold (4) clamps the prepreg at the outlet of the prepreg shaping mold (3) and drives the prepreg to move to the continuous curing mold (5); S3 continuous curing mold (5) cures the prepreg; S4: a cooling and pulling mold (6) cools and pulls the solidified blank into a cutting and grinding module (7); S5 cutting and polishing module (7) cuts and polishes the blank according to the product design shape; The S6 reel (8) winds the product.

6. The method for continuously forming an ultra-long thin-wall composite material support structure according to claim 5, characterized in that: In step S1, the unwinding tension of the unwinding shaft (1) is not less than 20N, and the straightness control accuracy is better than ±1mm; the prepreg tensioning tension is not less than 20N; and the temperature of the prepreg shaping mold (3) is 60±5°C.

7. The method for continuously forming an ultra-long thin-wall composite material support structure according to claim 5, characterized in that: In step S3, the length of the continuous curing mold (5) is not less than 1200 mm; The temperature of the continuous curing mold (5) is within 180°C; The continuous curing mold (5) adopts a pulsating opening and closing pressurized curing method: the length of the continuous curing mold (5) is assumed to be L. When the continuous curing mold (5) is opened, the prepreg moves forward a predetermined distance a, and then the continuous curing mold (5) is closed. The continuous curing mold (5) performs pressurized curing of the prepreg for a time of t and a pressure of not less than 0.1 MPa through the expansion of its own material; and then the above pressurization process is repeated; The distance a is 200-300 mm, the time t is 20-30 min, and (L / a)×t≥120 min.

8. The method for continuously forming an ultra-long thin-wall composite material support structure according to claim 7, characterized in that: In step S2, the clamping force pressure of the follow-up holding mold (4) is maintained at 0.1-0.3 MPa, and the temperature of the follow-up holding mold (4) is maintained at 95-105°C.

9. The method for continuously forming an ultra-long thin-wall composite material support structure according to claim 7, characterized in that: In step S4, the temperature of the cooling traction mold (6) is not greater than 100°C, and the clamping force is 0.1-0.3 MPa.

10. The method for continuously forming an ultra-long thin-wall composite material support structure according to claim 9, characterized in that: In step S2, when the continuous curing mold (5) is opened, the follower-holding mold (4) is closed, the prepreg is clamped and moved forward, and after moving forward a distance a, the continuous curing mold (5) is closed, and the follower-holding mold (4) is opened and returned to the original position; Repeat the above steps to achieve the shape retention function of the prepreg; In step S4, when the continuous solidification mold (5) is opened, the cooling and pulling mold (6) is closed, the blank is clamped and moved forward, and after moving forward a distance a, the continuous solidification mold (5) is closed, and the cooling and pulling mold (6) is opened and returned to the original position; Repeat the above steps to achieve the cooling traction function.

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