Thermoset composite grid structure filament winding self-heating mold and curing method

Abstract

The application discloses a thermosetting composite grid structure winding forming self-heating mold and a curing method, relates to the technical field of thermosetting composite forming, and can be used for complex multi-angle winding forming processes with a diameter greater than 3 meters. In view of the technical problems (heating lag, uneven heat distribution, heat transfer from outside to inside, and serious lag of core curing, which can cause internal stress, delamination, micro-cracks and other defects) existing in traditional autoclave heating, the application provides an in-situ heating and curing technical scheme which can solve the heat conduction bottleneck from the source. Specifically, by integrating a distributed electric heating network on the inner surface of the mold and constructing an efficient heat conduction path, active heating from the inside to the outside can be realized, the heat conduction bottleneck is eliminated, the core temperature is uniformly controllable, the mold as a whole can synchronously reach the curing temperature, the problems of heating lag and uneven curing are fundamentally solved, the key problems of low heating efficiency, uneven temperature field and insufficient curing in traditional winding forming are solved, and structural changes of the heating source are realized.

Description

Technical Field

[0001] This invention relates to the technical field of thermosetting composite material molding, and in particular to a self-heating mold for winding thermosetting composite material mesh structure and a curing method. Background Technology

[0002] Thermosetting composite mesh structures are widely used in the main load-bearing cylinders of deep space probes and large pressure vessels. These are formed by wet winding, with a typical process flow including: wet winding, encapsulation, placement in an autoclave, heating and curing, demolding, and post-processing. The curing process is highly dependent on autoclave heating, but this process has fundamental drawbacks in large-size, thick-walled structures. Specifically: (1) Severe heating delay: The autoclave needs to be preheated to the curing temperature for several hours, resulting in a very slow production cycle and difficulty in meeting the demand for high-efficiency manufacturing.

[0003] (2) Long heat transfer path and delayed core curing: Heat is transferred from the outer surface of the mold to the inside through heat conduction, resulting in high thermal resistance and slow heat transfer rate. The core resin reaches the curing temperature later than the surface, forming a "hot outside and cold inside" phenomenon.

[0004] (3) Uneven curing and frequent defects: The surface resin cross-links too early, forming a dense shell that hinders the diffusion of internal heat and volatiles; the core resin has a low degree of cross-linking due to insufficient temperature, resulting in: internal stress concentration, causing defects such as microcracks and delamination; decreased interlayer bonding force, resulting in delamination; volatiles are retained, forming pores; inconsistent mechanical properties and large strength dispersion.

[0005] (4) Uncontrollable process and large quality fluctuation: Traditional process cannot monitor and adjust the core temperature in real time. The curing process is a "black box operation", with poor consistency and difficulty in guaranteeing quality.

[0006] Existing research focuses on material modification or process parameter optimization, but cannot fundamentally solve the problems of "heating lag and uneven curing" in the winding molding of large composite mesh load-bearing structures. Summary of the Invention

[0007] This invention addresses the technical problems inherent in traditional autoclave heating (such as "heating lag, uneven heat distribution, heat transfer from the outside to the inside, and severe lag in core curing," which can lead to defects like internal stress, delamination, and microcracks). It provides an in-situ heating and curing technology that solves the heat conduction bottleneck at its source. Specifically, by integrating a distributed electrothermal network and constructing an efficient heat conduction path on the inner surface of the mold, active heating from the inside out is achieved, eliminating the heat conduction bottleneck, ensuring uniform and controllable core temperature, and enabling the entire mold to reach the curing temperature synchronously. This fundamentally solves the problems of "heating lag and uneven curing," addressing key issues in traditional winding molding such as low heating efficiency, uneven temperature field, and insufficient curing, thus achieving a structural transformation at the heating source.

[0008] In a first aspect, a self-heating mold for winding a thermosetting composite material mesh structure is provided, including a main mold cylinder, a first rotating shaft assembly, and a second rotating shaft assembly; the main mold cylinder is a metal cylinder in the shape of a cylinder; the first rotating shaft assembly and the second rotating shaft assembly are respectively fixed at both ends of the main mold cylinder to realize the rotational movement of the main mold cylinder so that the thermosetting composite material is wound and molded on the outside of the main mold cylinder to form a product; A thermal insulation layer and a heat-conducting layer are sequentially arranged from the inside to the outside on the inner wall of the main mold cylinder. N heating elements and N temperature sensors are also arranged on the main mold cylinder in a one-to-one correspondence, with the corresponding heating elements and temperature sensors arranged radially along the main mold cylinder. Each group of heating elements and temperature sensors corresponds to a heating area of ​​the main mold cylinder, where N ≥ 1. Heating elements are arranged inside the thermal insulation layer, located on the side of the thermal insulation layer facing the heat-conducting layer. The connecting cables of the heating elements are led out from the interlayer between the thermal insulation layer and the heat-conducting layer. N receiving holes are provided on the main mold cylinder, each used to accommodate one of the N temperature sensors. The connecting cables of the temperature sensors extend inward through the receiving holes and are led out from the interlayer between the main mold cylinder and the heat-conducting layer. Both the first and second rotating shaft head assemblies include a heat-insulating end plate and a central rotating shaft head; the central rotating shaft head is fixed at the center of the heat-insulating end plate and is used to connect with the main shaft of the winding equipment; the outer periphery of the heat-insulating end plate is fixed to the cylinder wall of the main mold body. N heating elements are connected in parallel to a first conductive slip ring via a wiring harness to achieve power and signal transmission during rotation. The first conductive slip ring is mounted on the heat-insulating end plate of the first rotating shaft head assembly. N temperature sensors are connected in parallel to a second conductive slip ring via a wiring harness to achieve power and signal transmission during rotation. The second conductive slip ring is mounted on the heat-insulating end plate of the second rotating shaft head assembly.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the first conductive slip ring includes a first shaft portion and a first ring portion; the connecting cables of N heating elements are led out and converged to the first shaft portion of the first conductive slip ring, the first shaft portion passes through the cable through hole on the heat insulation end plate of the first rotating shaft head assembly and docks with the first ring portion, and the first shaft portion rotates relative to the first ring portion along with the main mold cylinder.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, a second conductive slip ring is provided on the second rotating shaft head assembly; the second conductive slip ring includes a second shaft portion and a second ring portion; the connecting cables of N temperature sensors are led out and converged to the second shaft portion of the second conductive slip ring, the second shaft portion passes through the cable through hole on the heat insulation end plate of the second rotating shaft head assembly and docks with the second ring portion, and the second shaft portion rotates relative to the second ring portion along with the main mold cylinder.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, N heating elements are evenly spaced around the circumference of the main mold cylinder, covering the entire circumference of the main mold cylinder to form an "internal heating" heat source network; the heating elements are any of the following: heating film, heating sheet, heating plate, heating wire, heating tube.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the temperature sensor is a thermocouple or a resistance temperature detector (RTD), in the form of a rod or a sheet, and the temperature sensor is attached to the main mold cylinder.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, the thermally conductive layer is a graphene-containing material or thermally conductive silicone grease, and the thermally conductive layer is a coating or film, which is connected to the interior of the main mold cylinder by any of the following methods: brushing, spraying, or bonding.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the thermal insulation layer is foam or aerogel, which is connected to the thermally conductive layer in a segmented or spliced ​​manner.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the main mold cylinder is a thick-walled hollow cylindrical structure that forms a support structure; a positioning threaded hole is provided on the outer side of the main mold cylinder, which is used to fix the splicing block, which is placed between the main mold cylinder and the product so that the inner wall shape of the product meets the processing requirements.

[0016] Secondly, a self-heating device for winding and molding a thermosetting composite material mesh structure is provided. The self-heating device includes a self-heating mold as described in any of the implementations of the first aspect above, and also includes a dynamic temperature control system. The dynamic temperature control system is connected to N heating elements and N temperature sensors. The dynamic temperature control system is used to receive signals from the N temperature sensors and control the working state of the N heating elements according to the curing process to achieve precise temperature control. The dynamic temperature control system dynamically controls the power output of the N heating elements to achieve multi-zone temperature fine-tuning.

[0017] Thirdly, a method for self-heating curing of thermosetting composite material mesh structure through winding is provided, wherein the self-heating curing method uses the self-heating device described in any of the implementations of the second aspect above, and the self-heating curing method includes: Processing and preparing the main mold cylinder; N temperature sensors are installed on the inner wall of the main mold cylinder; Apply a heat-conducting layer to the inner surface of the main mold cylinder; N heating elements are arranged on the inner wall of the heat-conducting layer; A thermal insulation layer is wrapped around the inner surface of the heat-conducting layer; Install the first rotating shaft head assembly and the second rotating shaft head assembly; Using the main mold cylinder as the winding core mold, wet winding molding of composite material mesh structure is performed; Encapsulating expansion film and external shape-forming mold; The device heats up upon power-on, with real-time closed-loop temperature control throughout the process, and is demolded after curing.

[0018] Compared with the prior art, the solution provided by the present invention has at least the following beneficial technical effects: (1) Solve the problem of “heating lag”: The heating wire is embedded in the inner wall of the mold, and the heat is transferred from the inside to the composite material layer, shortening the time for the core to reach the curing temperature.

[0019] (2) Reduce internal stress and defects: The curing process has a uniform temperature, allowing volatiles to escape smoothly, without microcracks, delamination, or pores, and significantly improving the density of the structure.

[0020] (3) Shorten the production cycle: The cycle from the completion of winding to the completion of curing is shortened compared with the traditional autoclave process.

[0021] (4) Energy-saving and efficient: The power density of the electric heating network is low, and the total energy consumption is significantly reduced compared with the autoclave system, making it applicable to a wider range of scenarios. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a thermosetting composite material mesh structure winding self-heating mold according to the present invention.

[0023] Figure 2 This is a cross-sectional view of the multi-layer heating zone inside the main mold cylinder.

[0024] Figure 3 This is a flowchart of a self-heating curing method for winding and molding a thermosetting composite material mesh structure according to the present invention.

[0025] Reference numerals in the attached drawings: 1-Main mold cylinder; 2-Insulated end plate; 3-Heating element; 4-First conductive slip ring; 6-Heat-conducting layer; 7-Insulation layer; 8-Temperature sensor; 9-Positioning threaded hole. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, this invention provides a self-heating mold for winding a thermosetting composite material mesh structure. The self-heating mold includes a main mold cylinder 1, a first rotating shaft assembly, and a second rotating shaft assembly. The main mold cylinder 1 is a metal cylinder in the shape of a cylinder. The first and second rotating shaft assemblies are respectively fixed to both ends of the main mold cylinder 1 to realize the rotational movement of the main mold cylinder 1, so that the thermosetting composite material can be wound and formed into a mesh structure product on the outside of the main mold cylinder 1. In some embodiments, such as... Figure 2 As shown, a positioning threaded hole 9 is provided on the outer side of the main mold cylinder 1. The positioning threaded hole 9 is used to fix the splicing block. The splicing block is set between the main mold cylinder 1 and the product so that the inner wall shape of the product meets the processing requirements.

[0028] like Figure 2 As shown, the main mold cylinder 1 is provided with a heat-conducting layer 6, a heat-insulating layer 7, N heating elements 3, and N temperature sensors 8. The N heating elements 3 and N temperature sensors 8 correspond one-to-one radially to each other in the main mold cylinder 1. Corresponding heating elements 3 and temperature sensors 8 are arranged radially along the main mold cylinder 1, forming a group. Each group of heating elements 3 and temperature sensors 8 corresponds to a heating area in the main mold cylinder 1, where N ≥ 1, preferably N ≥ 2. The heat-insulating layer 7 and the heat-conducting layer 6 are sequentially arranged from the inside to the outside on the inner wall of the main mold cylinder 1, forming a "heat-conducting-heat-insulating" double-layer structure. The positioning threaded holes 9 on the main mold cylinder 1 cannot extend to the heat-conducting layer 6.

[0029] A heating element 3 is installed inside the thermal insulation layer 7, located on the side of the thermal insulation layer 7 facing the heat conduction layer 6. The connecting cable of the heating element 3 is led out from the interlayer between the thermal insulation layer 7 and the heat conduction layer 6. N receiving through holes are provided on the main mold cylinder 1, and the N receiving through holes are used to accommodate N temperature sensors 8 respectively. The connecting cables of the temperature sensors 8 extend inward through the receiving through holes and are led out from the interlayer between the main mold cylinder 1 and the heat conduction layer 6.

[0030] The structure of the first rotating shaft head assembly is similar to that of the second rotating shaft head assembly. Taking the first rotating shaft head assembly as an example, it includes a heat-insulating end-sealing plate 2 and a central rotating shaft head. The central rotating shaft head is fixed to the center of the heat-insulating end-sealing plate 2 (fixing method, for example, welding), and the outer periphery of the heat-insulating end-sealing plate 2 is fixed to the cylinder wall of the main mold cylinder 1 (fixing method, for example, welding). This central rotating shaft head is used to connect to the main shaft of the winding equipment. By binding and sealing the main mold cylinder 1 with the heat-insulating end-sealing plate 2, thermal isolation and sealing are achieved.

[0031] like Figure 1 As shown, N heating elements 3 are connected in parallel to the first conductive slip ring 4 via a wiring harness to achieve power and signal transmission during rotation. In some embodiments, the first rotating shaft head assembly is provided with the first conductive slip ring 4. The first conductive slip ring 4 includes a first shaft portion and a first ring portion. The connecting cables of the N heating elements 3 are led out and converged to the first shaft portion of the first conductive slip ring 4. The first shaft portion can pass through the cable through hole on the heat insulation end plate 2 of the first rotating shaft head assembly and dock with the first ring portion. The first shaft portion can rotate with the main mold cylinder 1 relative to the first ring portion.

[0032] N temperature sensors 8 are connected in parallel to the second conductive slip ring via a wiring harness to achieve power and signal transmission during rotation. In some embodiments, a second conductive slip ring is provided on the second rotating shaft head assembly. The second conductive slip ring includes a second shaft portion and a second ring portion. The connecting cables of the N temperature sensors 8 are led out and converged to the second shaft portion of the second conductive slip ring. The second shaft portion can pass through the cable through hole on the heat insulation end plate 2 of the second rotating shaft head assembly and dock with the second ring portion. The second shaft portion can rotate with the main mold cylinder 1 relative to the second ring portion.

[0033] In some embodiments, N heating elements 3 are evenly arranged at certain intervals around the circumference of the main mold cylinder 1, covering the entire circumference of the main mold cylinder 1 to form an "internal heating" heat source network.

[0034] In some embodiments, the heating element 3 is preferably a heating film, heating sheet, or heating plate, but can also be a heating wire or heating tube. Depending on the curing temperature, it can specifically be a PI heating film, an aluminum foil heating sheet, a heating plate, etc.

[0035] In some embodiments, the temperature sensor 8 can be a thermocouple or a resistance temperature detector (RTD), and can be in the form of a rod or a sheet, requiring good fit with the mold.

[0036] In some embodiments, the thermally conductive layer 6 is a material with high in-plane thermal conductivity, which can be a coating or a thin film, and is connected to the interior of the main mold cylinder 1 by brushing, spraying, bonding, or other methods. Specifically, the thermally conductive layer 6 can be a graphene-containing coating, thermally conductive silicone grease, or other materials, whose in-plane thermal conductivity can meet the requirement of rapid and uniform in-plane temperature.

[0037] In some embodiments, the thermal insulation layer 7 is a porous lightweight material, such as foam or aerogel, and is connected to the thermally conductive layer 6 in a segmented or spliced ​​manner.

[0038] In some embodiments, the main mold cylinder 1 is a thick-walled hollow cylindrical structure used to improve the overall rigidity and thermal deformation resistance of the mold, forming a support structure.

[0039] This invention also provides a self-heating device for winding and molding a thermosetting composite material mesh structure. The self-heating device includes the aforementioned self-heating mold and may further include a dynamic temperature control system. The dynamic temperature control system is connected to N heating elements 3 and N temperature sensors 8. The dynamic temperature control system receives signals from the N temperature sensors 8 and controls the working state of the N heating elements 3 according to the curing process, achieving precise temperature control. When N > 1, the corresponding heating elements 3 and temperature sensors 8 form a group, and each group of heating elements 3 and temperature sensors 8 corresponds to a heating area of ​​the main mold cylinder 1. Therefore, the dynamic temperature control system can dynamically control the power output of the N heating elements 3, achieving multi-area temperature fine-tuning.

[0040] like Figure 3 As shown, this invention also provides a self-heating curing method for winding a thermosetting composite material mesh structure. After wet winding is completed, the workpiece, along with the main mold cylinder 1, is moved into the curing chamber; the electric heating network is activated, and the heating wires directly conduct heat to the interior of the composite material layer, achieving active heating "from the inside out"; the control device dynamically adjusts the heating power based on real-time temperature feedback to ensure uniform curing of the entire structure; after curing, the power is turned off for cooling, and the finished product is obtained by demolding. The specific steps are as follows.

[0041] Step 1: Processing and preparing the main mold cylinder 1.

[0042] In some embodiments, aluminum alloy sheet is selected to process and form the inner lining of the main mold cylinder 1, remove the oxide layer and oil stains on the inner surface, improve the interfacial adhesion strength between the thermally conductive coating and the metal substrate, and clean and dry the inner surface of the cylinder for later use.

[0043] Step 2: Install N temperature sensors 8 on the inner wall of the main mold cylinder 1.

[0044] In some embodiments, N temperature sensors 8 are arranged at intervals on the inner wall of the main mold cylinder 1. The probes of the temperature sensors 8 are closely attached to the inner surface of the receiving through hole of the main mold cylinder 1 and fixed with high temperature resistant tape. All the connecting cables of the temperature sensors 8 are uniformly collected to the second conductive slip ring and then connected to the dynamic temperature control system.

[0045] Step 3: Apply a heat-conducting layer 6 to the inner surface of the main mold cylinder 1.

[0046] In some embodiments, a thermally conductive epoxy primer slurry (graphene powder, epoxy matrix, alumina filler) is prepared and uniformly applied to the entire inner surface of the main mold cylinder 1 using a roller coating process.

[0047] Step 4: Arrange N heating elements 3 on the inner wall of the heat-conducting layer 6.

[0048] In some embodiments, a flexible electric heating film is laid on the inner wall of the heat-conducting layer 6, and the heating film is completely attached to the inner surface of the barrel without wrinkles or curling edges; all the connecting cables of the heating elements 3 are uniformly collected to the first conductive slip ring 4, and then connected to the dynamic temperature control system.

[0049] Step 5: Cover with thermal insulation layer 7.

[0050] In some embodiments, a multi-layer aerogel thermal insulation pad is wrapped around the thermally conductive layer 6 and N heating elements 3 to form a thermal insulation layer 7. The thermal insulation layer 7 completely covers the entire heating area of ​​the main mold cylinder 1, and overlaps at the end joints to block heat loss during heating, reduce power consumption, and ensure uniform and stable radial temperature field of the cylinder.

[0051] Step 6: Install the first rotating shaft head assembly and the second rotating shaft head assembly.

[0052] In some embodiments, the heat-insulating end plates 2 of the first and second rotating shaft head assemblies are made of lightweight high-temperature resistant composite material plates and are respectively assembled at the two end openings of the main mold cylinder 1 to seal the axial ends of the main mold cylinder 1; the gaps between the heat-insulating end plates 2 and the main mold cylinder 1 and the heat insulation layer 7 are filled with high-temperature resistant sealing cotton.

[0053] Step 7: Wet winding of composite material mesh structure.

[0054] In some embodiments, the main mold cylinder 1 is used as the winding core mold, and the splicing block is fixed to the positioning threaded hole 9 to form a fiber winding groove. Using a wet winding process, continuous carbon fibers impregnated with epoxy resin are uniformly wound into the outer groove of the cylinder according to the designed layup angle and thickness. The fiber tension and resin content are controlled in real time. The winding is stopped after the preset wall thickness is reached, thus completing the wet winding of the mesh structure.

[0055] Step 8: Encapsulate the expansion film and external shape mold.

[0056] In some embodiments, a heat-expanding silicone rubber soft film is coated on the outer surface of the composite material blank after wet winding. The soft film is located in the groove and completely adheres to the surface of the fiber layer. A split rigid shaped mold is fitted on the outside of the soft film. During the fitting process, a sealing strip is placed at the joint and the outer contour. The shaped mold is closed and locked along the axial direction of the main mold cylinder 1.

[0057] Step 9: Power on and heat up, with real-time closed-loop temperature control throughout the process.

[0058] In some embodiments, the terminals of the first conductive slip ring 4 and the second conductive slip ring are connected to the temperature controller of the dynamic temperature control system. Heating is performed in segments according to the composite material curing process curve: first, the temperature of the main mold cylinder 1 is slowly increased in a low-temperature heating stage to ensure the impregnation of the fiber resin system; then, the temperature is increased to the curing constant temperature range. The temperature controller collects the temperature at various points on the main mold cylinder 1 in real time through N temperature sensors 8 and automatically adjusts the output power of the heating element 3, controlling the temperature difference across the entire main mold cylinder 1 within the allowable range throughout the process, achieving closed-loop precise temperature control. Simultaneously, the expansion of the soft film due to heat can fill the tiny gaps in the fiber layer, ensuring the dimensional accuracy and surface flatness of the cured composite material.

[0059] Step 10: Curing complete and demolding.

[0060] In some embodiments, after curing is completed, the power is turned off and cooled to room temperature. The winding device loosens the central rotating shaft of the first rotating shaft assembly and the second rotating shaft assembly, and sequentially removes the external shaped mold, sealing strip, soft film, and heat insulation end plate 2, and takes the workpiece out from the main mold cylinder 1.

[0061] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A self-heating mold for winding a thermosetting composite material mesh structure, characterized in that, It includes a main mold cylinder (1), a first rotating shaft head assembly and a second rotating shaft head assembly; the main mold cylinder (1) is a metal cylinder in the shape of a cylinder; the first rotating shaft head assembly and the second rotating shaft head assembly are respectively fixed at both ends of the main mold cylinder (1) to realize the rotational movement of the main mold cylinder (1) so that the thermosetting composite material is wound and molded on the outside of the main mold cylinder (1) to form a product; A heat insulation layer (7) and a heat-conducting layer (6) are sequentially arranged from the inside to the outside on the inner wall of the main mold cylinder (1); N heating elements (3) and N temperature sensors (8) are also provided on the main mold cylinder (1). The N heating elements (3) and N temperature sensors (8) correspond one-to-one. The corresponding heating elements (3) and temperature sensors (8) are arranged radially along the main mold cylinder (1). The corresponding heating elements (3) and temperature sensors (8) form a group. Each group of heating elements (3) and temperature sensors (8) corresponds to one of the main mold cylinders (1). Heating area, N≥1; A heating element (3) is set inside the heat insulation layer (7), the heating element (3) is located on the side of the heat insulation layer (7) facing the heat conduction layer (6), and the connecting cable of the heating element (3) is led out from the interlayer between the heat insulation layer (7) and the heat conduction layer (6); N receiving through holes are set on the main mold cylinder (1), and the N receiving through holes are used to receive N temperature sensors (8); The connecting cable of the temperature sensor (8) extends inward through the receiving through hole and is led out from the interlayer between the main mold cylinder (1) and the heat conduction layer (6); Both the first and second rotating shaft head assemblies include a heat-insulating end plate (2) and a central rotating shaft head; the central rotating shaft head is fixed at the center of the heat-insulating end plate (2) and is used to connect with the main shaft of the winding equipment; the outer periphery of the heat-insulating end plate (2) is fixed to the cylinder wall of the main mold cylinder (1); N heating elements (3) are connected in parallel to the first conductive slip ring (4) through a wire harness to realize the transmission of electrical energy and signals during the rotation process. The first conductive slip ring (4) is set on the heat insulation end plate (2) of the first rotating shaft head assembly. N temperature sensors (8) are connected in parallel to the second conductive slip ring through a wire harness to realize the transmission of electrical energy and signals during the rotation process. The second conductive slip ring is set on the heat insulation end plate (2) of the second rotating shaft head assembly.

2. The self-heating mold according to claim 1, characterized in that, The first conductive slip ring (4) includes a first shaft and a first ring. The connecting cables of N heating elements (3) are led out and converged to the first shaft of the first conductive slip ring (4). The first shaft passes through the cable through hole on the heat insulation end plate (2) of the first rotating shaft assembly and docks with the first ring. The first shaft rotates relative to the first ring as the main mold cylinder (1) rotates.

3. The self-heating mold according to claim 1, characterized in that, The second rotating shaft head assembly is provided with a second conductive slip ring; the second conductive slip ring includes a second shaft part and a second ring part; the connecting cables of N temperature sensors (8) are led out and converged to the second shaft part of the second conductive slip ring, the second shaft part passes through the cable through hole on the heat insulation end plate (2) of the second rotating shaft head assembly and docks with the second ring part, and the second shaft part rotates relative to the second ring part along with the main mold cylinder (1).

4. The self-heating mold according to claim 1, characterized in that, N heating elements (3) are evenly spaced around the circumference of the main mold cylinder (1), covering the entire circumference of the main mold cylinder (1) to form an "internal heating" heat source network; the heating elements (3) are any of the following: heating film, heating sheet, heating plate, heating wire, heating tube.

5. The self-heating mold according to claim 1, characterized in that, The temperature sensor (8) is a thermocouple or a resistance temperature detector, in the form of a rod or a sheet, and the temperature sensor (8) is attached to the main mold cylinder (1).

6. The self-heating mold according to claim 1, characterized in that, The thermally conductive layer (6) is a graphene-containing material or thermally conductive silicone grease. The thermally conductive layer (6) is a coating or film and is connected to the inside of the main mold cylinder (1) by any of the following methods: brushing, spraying, or bonding.

7. The self-heating mold according to claim 1, characterized in that, The thermal insulation layer (7) is made of foam or aerogel and is connected to the heat-conducting layer (6) by segmentation and splicing.

8. The self-heating mold according to claim 1, characterized in that, The main mold cylinder (1) is a thick-walled hollow cylindrical structure that forms a support structure. The outer side of the main mold cylinder (1) is provided with a positioning threaded hole (9), which is used to fix the splicing block. The splicing block is set between the main mold cylinder (1) and the product so that the inner wall shape of the product meets the processing requirements.

9. A self-heating device for winding and molding a thermosetting composite material mesh structure, characterized in that, The self-heating device includes a self-heating mold as described in any one of claims 1 to 8, and also includes a dynamic temperature control system; the dynamic temperature control system is connected to N heating elements (3) and N temperature sensors (8), the dynamic temperature control system is used to receive signals from the N temperature sensors (8), and control the working state of the N heating elements (3) according to the curing process, so as to achieve precise temperature control; the dynamic temperature control system dynamically controls the power output of the N heating elements (3) to achieve multi-zone temperature fine adjustment.

10. A method for self-heating and curing thermosetting composite material mesh structure winding molding, characterized in that, The self-heating curing method uses the self-heating device as described in claim 9, and the self-heating curing method includes: Processing and preparing the main mold cylinder (1); N temperature sensors (8) are arranged on the inner wall of the main mold cylinder (1); A heat-conducting layer (6) is applied to the inner surface of the main mold cylinder (1); N heating elements (3) are arranged on the inner wall of the heat-conducting layer (6); A thermal insulation layer (7) is wrapped around the inner surface of the thermally conductive layer (6); Install the first rotating shaft head assembly and the second rotating shaft head assembly; Using the main mold cylinder (1) as the winding core mold, wet winding molding of composite material grid structure is performed; Encapsulating expansion film and external shape-forming mold; The device heats up upon power-on, with real-time closed-loop temperature control throughout the process, and is demolded after curing.

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