Integrated self-heating airbag pressurized composite forming device and forming method thereof

Abstract

This invention discloses an integrated self-heating airbag pressurized composite molding device and its molding method, relating to the field of composite molding technology. The device includes a lower mold assembly, an upper mold assembly, and an airbag pressurizing assembly, which is disposed within a molding cavity formed between the lower and upper mold assemblies. By setting a first embedded self-heating unit within the lower mold substrate, heat is directly transferred from the interior of the lower mold substrate to the lower mold molding surface, shortening the heat conduction path and reducing heat loss, significantly improving thermal efficiency, heating and cooling rates, and reducing energy consumption. Furthermore, by setting a temperature sensor array composed of multiple K-type thermocouples on the lower mold substrate, with each K-type thermocouple embedded within the lower mold substrate, multi-point real-time temperature monitoring is implemented across the entire molding surface and molding cavity. Combined with the first embedded self-heating unit, precise temperature control is achieved, effectively improving temperature uniformity and avoiding curing defects caused by localized overheating or underheating.

Description

Technical Field

[0001] This invention relates to the field of composite molding technology, and in particular to an integrated self-heating airbag pressurized composite molding device and its molding method. Background Technology

[0002] Hot pressing and curing of composite materials is a key manufacturing process in fields such as aerospace structural components and lightweight components for new energy vehicles. Currently, the mainstream molding technologies include autoclave molding, compression molding, and oven molding (outside the OOA can). While autoclave molding can provide high molding pressure and a relatively uniform temperature field, it requires large equipment investment, has a single curing cycle of 6-12 hours, consumes extremely high energy, and its effective working diameter is usually limited (≤8m). Large-size tooling has low heating efficiency, and the temperature error of parts inside the autoclave can reach approximately 20℃. Compression molding relies on solid metal molds, making it difficult to mold components with complex internal cavities or undercut structures. Furthermore, rigid mold closure leads to uneven pressure distribution, significant edge effects, and a tendency to produce resin-rich or resin-poor defects. Its external hot plate conduction heating method results in a mold heating rate of less than 3℃ / min and high thermal inertia. Although oven molding eliminates the size limitations of autoclaves, the molding pressure is extremely low (≤0.1MPa), resulting in high porosity of the products. Ovens also have poor thermal conductivity and large heat loss, making it difficult to control the temperature rise of parts and causing uneven heating. Furthermore, they place stringent requirements on the prepreg system, and most prepregs on the market cannot meet their process window, thus limiting their application range.

[0003] All three technologies mentioned above rely on external heat sources to indirectly heat the mold and workpiece, and generally suffer from common problems such as low thermal efficiency, poor temperature uniformity, slow heating and cooling rates, and high energy consumption. At the same time, regardless of the method, it is difficult to achieve uniform and controllable pressure distribution throughout the mold cavity for the molding of complex curved surfaces or thin-walled components. The internal quality and dimensional accuracy problems caused by uneven pressure have long plagued the industry.

[0004] In summary, existing molding devices suffer from low thermal efficiency, poor temperature uniformity, slow heating and cooling rates, high energy consumption, and uneven pressure leading to poor internal quality and dimensional accuracy. Summary of the Invention

[0005] This invention provides an integrated self-heating airbag pressurized composite molding device and its molding method, which can solve the problems of low thermal efficiency, poor temperature uniformity, slow heating and cooling rate, high energy consumption, and low internal quality and dimensional accuracy caused by uneven pressure in the prior art.

[0006] An integrated self-heating airbag pressurized composite molding device includes a lower mold assembly, an upper mold assembly, and an airbag pressurizing assembly. The airbag pressurizing assembly is disposed within a molding cavity formed between the lower mold assembly and the upper mold assembly. A temperature sensor array is disposed on the lower mold assembly. The lower mold assembly includes a lower mold base, within which a first embedded self-heating unit is disposed. A lower mold forming surface is formed on the upper surface of the lower mold base. The airbag pressurizing assembly includes an annular airbag disposed within the molding cavity, with an air passage interface disposed on one side of the annular airbag. The temperature sensor array consists of multiple K-type thermocouples, each of which is embedded within the lower mold base.

[0007] The integrated self-heating airbag pressurized composite molding device provided by this invention has, but is not limited to, the following beneficial effects compared with the prior art: This integrated self-heating airbag pressurized composite molding device uses a first embedded self-heating unit within the lower mold base to directly transfer heat from the interior of the lower mold base to the molding surface, shortening the heat conduction path and reducing heat loss, significantly improving thermal efficiency, heating and cooling rates, and reducing energy consumption. A temperature sensor array composed of multiple K-type thermocouples is installed on the lower mold base, with each thermocouple embedded inside, enabling multi-point real-time temperature monitoring of the molding surface and the entire molding cavity. This, combined with the first embedded self-heating unit, achieves precise temperature control, effectively improving temperature uniformity and avoiding curing defects caused by localized overheating or underheating. By placing an annular airbag within the molding cavity and above the prepreg, the airbag expands after inflation and directly and evenly presses against the upper surface of the prepreg. Utilizing the isobaric transmission characteristics of gas, pressure is evenly applied to the entire prepreg area. Compared to the localized pressure of rigid molding, this effectively solves the internal quality and dimensional accuracy problems caused by uneven pressure distribution, making it particularly suitable for molding complex curved surfaces or thin-walled components.

[0008] Furthermore, the upper mold assembly includes an upper mold base, a second embedded self-heating unit is disposed within the upper mold base, and a temperature sensor array is disposed on the upper mold base.

[0009] Furthermore, a first insert groove is formed on the upper part of the lower mold base, the bottom of the first insert groove is the lower mold forming surface, a second insert groove is formed on the lower part of the upper mold base, the upper part of the second insert groove is the upper mold forming surface, and a forming cavity is formed between the first insert groove and the second insert groove.

[0010] Furthermore, it also includes a vacuum extraction assembly, which includes a vacuum extraction channel and a vacuum interface. The vacuum extraction channel is located inside the lower mold base, with one end of the vacuum extraction channel located at the edge of the lower mold forming surface, and the other end of the vacuum extraction channel extending to the outer surface of the lower mold base to form a vacuum interface.

[0011] Furthermore, it also includes a precision positioning guide assembly, which includes a conical positioning guide post and a precision guide sleeve. The conical positioning guide post is located at the four corners of the upper mold base, and the precision guide sleeve is located at the corresponding position of the lower mold base.

[0012] Furthermore, it also includes a collaborative control component, which includes a temperature control module, a gas control module, and a vacuum control module. The temperature control module is electrically connected to the first embedded self-heating unit and the temperature sensor array, the gas control module is connected to the gas path interface, and the vacuum control module is connected to the vacuum pumping component.

[0013] Furthermore, both the first embedded self-heating unit and the second embedded self-heating unit are serpentine resistance wire arrays. The serpentine resistance wire arrays are embedded in the lower mold base and the upper mold base at a position 8-12mm away from the corresponding forming surface. The power density of the serpentine resistance wire arrays is 8-15W / cm².

[0014] Furthermore, the lower mold base and the upper mold base are each divided into multiple independent temperature control zones, and the serpentine resistance wires in each independent temperature control zone are independently electrically connected to each other to achieve independent zone control.

[0015] An integrated self-heating airbag pressurized composite molding method, based on the aforementioned integrated self-heating airbag pressurized composite molding device, includes the following steps: S1. Lay the multi-layer prepreg material on the lower mold forming surface in a predetermined layering sequence; S2. Place the annular airbag on the multi-layer prepreg, then close the upper mold assembly and the lower mold assembly, and connect the external air source to the annular airbag through the air passage interface. S3. Start the first embedded self-heating unit to heat the lower mold forming surface and the forming cavity, and monitor the temperature in real time through the temperature sensor array; S4. Compressed air is introduced into the annular airbag through the air passage interface, causing the annular airbag to expand and compress the prepreg material in the molding cavity to achieve uniform pressure. S5. Maintain the preset curing temperature and pressure to allow the prepreg to cure and solidify. S6. Stop heating and wait for the temperature to drop to the preset demolding temperature. Release the pressure inside the annular air bladder, open the mold and remove the molded component.

[0016] Further, in step S3, the first embedded self-heating unit heats the molding cavity to 180°C at a heating rate of 5-15°C / min; in step S4, compressed air is introduced into the annular airbag at a pressurization rate of 0.1 MPa / s to a pressure of 0.6 MPa; in step S5, the temperature is maintained at 180°C and 0.6 MPa for 90 min; in step S6, the temperature is cooled to below 60°C at a cooling rate of 2°C / min. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an integrated self-heating airbag pressurized composite molding device according to an embodiment of the present invention; Figure 2 This is a front view of an integrated self-heating airbag pressurized composite molding device according to an embodiment of the present invention; Figure 3 for Figure 1 Cross-sectional view of the lower and middle mold components; Figure 4 for Figure 1 Schematic diagram of the middle and lower mold assembly; Figure 5 for Figure 1 Schematic diagram of the upper and middle mold components; Figure 6 for Figure 1 Schematic diagram of the central airbag pressurization assembly; Figure 7 This is a flowchart illustrating an embodiment of the integrated self-heating airbag pressurized composite molding method of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Lower mold assembly; 2. Upper mold assembly; 3. Airbag pressurization assembly; 4. Molding cavity; 5. Temperature sensor array; 6. Vacuum extraction assembly; 7. Precision positioning and guiding assembly; 8. Cooperative control assembly; 11. Lower mold base; 12. First embedded self-heating unit; 13. Lower mold forming surface; 14. First insert groove; 21. Upper mold base; 22. Second embedded self-heating unit; 23. Upper mold forming surface; 24. Second insert groove; 31. Annular airbag; 32. Air passage interface; 51. K-type thermocouple; 61. Vacuum extraction channel; 62. Vacuum interface; 71. Conical positioning guide post; 72. Precision guide sleeve; 81. Temperature control module; 82. Air control module; 83. Vacuum control module. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application are described clearly and completely below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," "comprise," etc., in the specification, claims, and accompanying drawings of this application are open-ended terms, indicating that a method comprises one or more steps, or an apparatus comprises one or more elements, but do not exclude the inclusion of other steps or elements. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or primary / secondary relationship. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] like Figures 1 to 4 As shown in the figure, an integrated self-heating airbag pressurized composite molding device provided by an embodiment of the present invention includes a lower mold assembly 1, an upper mold assembly 2, and an airbag pressurization assembly 3. The airbag pressurization assembly 3 is disposed in a molding cavity 4 formed between the lower mold assembly 1 and the upper mold assembly 2. A temperature sensor array 5 is disposed on the lower mold assembly 1. The lower mold assembly 1 includes a lower mold base 11, in which a first embedded self-heating unit 12 is disposed. A lower mold forming surface 13 is formed on the upper surface of the lower mold base 11. The airbag pressurization assembly 3 includes an annular airbag 31, which is disposed in the molding cavity 4. An air passage interface 32 is disposed on one side of the annular airbag 31. The temperature sensor array 5 is composed of multiple K-type thermocouples 51, each K-type thermocouple 51 being embedded inside the lower mold base 11.

[0025] In this embodiment, by setting a first embedded self-heating unit 12 inside the lower mold base 11, heat is directly transferred from the inside of the lower mold base 11 to the lower mold forming surface 13. Compared with the traditional external heat source heating method, this significantly shortens the heat conduction path, reduces heat loss to the environment, significantly improves thermal efficiency and heating / cooling rate, and reduces energy consumption. By setting a temperature sensor array 5 composed of multiple K-type thermocouples 51 on the lower mold base 11, with each K-type thermocouple 51 embedded inside the lower mold base 11, multi-point real-time temperature monitoring of the entire lower mold forming surface 13 and forming cavity 4 can be implemented, in conjunction with the first... The embedded self-heating unit 12 achieves precise temperature control, effectively improving the temperature uniformity within the molding cavity 4 and avoiding curing quality defects caused by local overheating or underheating. By placing the annular airbag 31 of the airbag pressurizing component 3 inside the molding cavity 4 and above the prepreg, the annular airbag 31 expands after being inflated through the air passage interface 32 and directly and evenly presses the upper surface of the prepreg. Utilizing the isobaric transmission characteristics of gas, the pressure is evenly applied to the entire area of ​​the prepreg. Compared with the localized pressure application method of rigid molding, this effectively solves the internal quality and dimensional accuracy problems caused by uneven pressure distribution, and is especially suitable for molding complex curved surfaces or thin-walled components.

[0026] like Figure 3 and Figure 5 As shown, in some embodiments of the present invention, the upper mold assembly 2 includes an upper mold base 21, a second embedded self-heating unit 22 is disposed in the upper mold base 21, and a temperature sensor array 5 is disposed on the upper mold base 21.

[0027] Specifically, by setting a second embedded self-heating unit 22 in the upper mold base 21, the upper mold assembly 2 itself has active heating capability, which works in conjunction with the first embedded self-heating unit 12 in the lower mold assembly 1 to achieve synchronous heating on both sides of the upper and lower molds. The heat is transferred bidirectionally from the upper mold forming surface 23 and the lower mold forming surface 13 to the prepreg in the forming cavity 4. By simultaneously setting a temperature sensor array 5 on the upper mold base 21, which works in conjunction with the temperature sensor array 5 on the lower mold assembly 1, the temperature of the upper and lower molds is independently monitored at multiple points, providing the temperature control module with more comprehensive global temperature distribution data and effectively eliminating the temperature difference between the upper and lower molds.

[0028] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, a first insert groove 14 is formed on the upper part of the lower mold base 11, the bottom of the first insert groove 14 is the lower mold forming surface 13, a second insert groove 24 is formed on the lower part of the upper mold base 21, the upper part of the second insert groove 24 is the upper mold forming surface 23, and a forming cavity 4 is formed between the first insert groove 14 and the second insert groove 24.

[0029] Specifically, by confining the prepreg within the molding cavity 4 formed by the lower mold forming surface 13 and the upper mold forming surface 23, this closed mold cavity structure effectively prevents the prepreg from laterally slipping or overflowing during mold closing and pressurization, ensuring the dimensional accuracy and edge quality of the molded component. The molding cavity 4 is formed by precisely interlocking the first insert groove 14 and the second insert groove 24 in the mold-closed state. The lower mold forming surface 13 serves as the bottom surface of the groove to support the prepreg, and the upper mold forming surface 23 serves as the top surface of the groove to apply downward pressure. The two work together to achieve precise positioning of the prepreg in the thickness direction.

[0030] like Figure 1 and Figure 4 As shown, in some embodiments of the present invention, a vacuum pumping assembly 6 is also included. The vacuum pumping assembly 6 includes a vacuum pumping channel 61 and a vacuum interface 62. The vacuum pumping channel 61 is disposed inside the lower mold base 11. One end of the vacuum pumping channel 61 is located at the edge of the lower mold forming surface 13, and the other end of the vacuum pumping channel 61 extends to the outer surface of the lower mold base 11 to form a vacuum interface 62.

[0031] Specifically, after the prepreg is laid out, an external vacuum source can be directly connected to the vacuum interface 62 to perform a vacuuming operation on the molding cavity 4, and vacuum pre-compact the prepreg layers to effectively remove the air trapped between each layer of prepreg, avoid defects such as pores, delamination or looseness in the molded component after curing, significantly reduce porosity and improve the interlayer bonding quality.

[0032] like Figure 4 and Figure 5As shown, in some embodiments of the present invention, a precision positioning guide component 7 is also included. The precision positioning guide component 7 includes a conical positioning guide post 71 and a precision guide sleeve 72. The conical positioning guide post 71 is disposed at the four corners of the upper mold base 21, and the precision guide sleeve 72 is disposed at the corresponding position of the lower mold base 11.

[0033] Specifically, by setting the conical positioning guide post 71 of the precision positioning guide component 7 at the four corners of the upper mold base 21 and the precision guide sleeve 72 at the corresponding position of the lower mold base 11, the conical positioning guide post 71 is gradually introduced under the guidance of the precision guide sleeve 72 when the mold is closed. The self-centering effect of the conical surface is used to automatically correct the small positional deviation of the upper and lower molds, ensuring the repeatability of the positioning accuracy of the upper mold component 2 and the lower mold component 1, effectively avoiding the misalignment of the prepreg layer or the uneven wall thickness of the molded component caused by the mold closing offset, and significantly improving the dimensional accuracy and consistency of the molded component.

[0034] like Figure 2 , Figure 4 and Figure 6 As shown, in some embodiments of the present invention, a collaborative control component 8 is also included. The collaborative control component 8 includes a temperature control module 81, a gas control module 82, and a vacuum control module 83. The temperature control module 81 is electrically connected to the first embedded self-heating unit 12 and the temperature sensor array 5. The gas control module 82 is connected to the gas path interface 32. The vacuum control module 83 is connected to the vacuum pumping component 6.

[0035] Specifically, the temperature control module 81 of the collaborative control component 8 is electrically connected to the first embedded self-heating unit 12 and the temperature sensor array 5 to form a closed-loop temperature control circuit. The temperature sensor array 5 collects temperature data from multiple points inside the lower mold base 11 in real time and feeds it back to the temperature control module 81. The temperature control module 81 dynamically adjusts the output power of the first embedded self-heating unit 12 according to the deviation between the preset heating curve and the measured temperature, thereby achieving precise closed-loop control of the temperature of the lower mold forming surface 13 and the forming cavity 4. The pneumatic control module 82 is connected to the pneumatic interface 32, enabling precise... The system accurately controls the pressurization rate and holding pressure of compressed air supplied to the annular airbag 31, achieving linear pressurization of 0.1 MPa / s and stepless pressure regulation within the range of 0.1-1.5 MPa. Simultaneously, the vacuum control module 83 is connected to the vacuum pumping component 6, which can automatically perform vacuum pre-compaction operations after the prepreg is laid, and continuously pump out volatiles generated by the resin reaction during the curing and heating process. The three control modules work independently and collaboratively, realizing the time-sequential coordinated control of the three parameters of temperature, pressure, and vacuum, ensuring that each process step is executed accurately according to the preset sequence and parameters.

[0036] More specifically, the collaborative control component 8 is equipped with a PLC-coordinated temperature control module 81, a gas control module 82, and a vacuum control module 83.

[0037] like Figure 1 and Figure 3 As shown, in some embodiments of the present invention, the first embedded self-heating unit 12 and the second embedded self-heating unit 22 are both serpentine resistance wire arrays. The serpentine resistance wire arrays are embedded in the lower mold base 11 and the upper mold base 21 at a position 8-12 mm away from the corresponding forming surface. The power density of the serpentine resistance wire arrays is 8-15 W / cm².

[0038] Specifically, the serpentine resistance wire array is evenly distributed in a continuous, winding path inside the lower mold base 11 and the upper mold base 21. Compared with linear or single-point heating elements, the serpentine layout significantly increases the length of the heating element and the heat source distribution density per unit area. This allows heat to be evenly conducted along the base material to the forming surface after it is generated inside the mold, effectively eliminating local overheating or undercooling areas. Combined with a shallow embedding distance of 8-12mm from the corresponding forming surface, the heat conduction path is greatly shortened and the thermal inertia is reduced, enabling heat to be quickly and evenly transferred to the forming cavity 4. This significantly improves the heating rate and temperature uniformity, while reducing heat loss to the back of the mold and the external environment, effectively reducing energy consumption.

[0039] More specifically, the lower mold base 11 and the upper mold base 21 are divided into multiple independent temperature control zones, and the serpentine resistance wires in each independent temperature control zone are independently electrically connected to each other to achieve independent zone control.

[0040] like Figure 7 As shown, this embodiment of the invention also provides an integrated self-heating airbag pressurized composite molding method, based on the above-mentioned integrated self-heating airbag pressurized composite molding device, including the following steps: S1, laying multiple layers of prepreg in a predetermined layering sequence on the lower mold forming surface 13; S2, placing the annular airbag 31 on the multiple layers of prepreg, then closing the upper mold assembly 2 and the lower mold assembly 1, and connecting the external air source to the annular airbag 31 through the air passage interface 32; S3, activating the first embedded self-heating unit 12 to heat the lower mold forming surface 13 and the molding cavity 4, and monitoring the temperature in real time through the temperature sensor array 5; S4, introducing compressed air into the annular airbag 31 through the air passage interface 32, causing the annular airbag 31 to expand and compress the prepreg in the molding cavity 4, achieving uniform pressurization; S5, maintaining the preset curing temperature and pressure to cure and mold the prepreg; S6, stopping heating, and after the temperature drops to the preset demolding temperature, releasing the pressure inside the annular airbag 31, opening the mold and removing the molded component.

[0041] In this embodiment, by laying multiple layers of prepreg in a predetermined layup sequence on the lower mold forming surface 13, and directly laying the prepreg on the upper surface of the lower mold base 11 with a self-heating function, and cooperating with the operation method of placing the annular airbag 31 on the multiple layers of prepreg before mold closing in S2, the annular airbag 31 is directly attached to the upper surface of the prepreg. When the airbag expands, the pressure is directly and evenly transmitted from the surface of the airbag to the entire area of ​​the prepreg. The isobaric transmission characteristics of gas are used to achieve flexible pressure on the entire surface of the prepreg, effectively solving the problem of high edge pressure and center pressure in traditional rigid molding. The uneven pressure distribution caused by low pressure significantly improves the forming quality and dimensional accuracy of complex curved surfaces and thin-walled components. During mold closing, an external air source is connected to the annular airbag 31 via the air path interface 32, activating the first embedded self-heating unit 12 to heat the lower mold forming surface 13 and the forming cavity 4. The temperature is monitored in real-time by the temperature sensor array 5. This allows mold closing positioning, air path connection, and temperature preparation to be completed sequentially at the same station, eliminating the need to transfer workpieces between heating and pressurizing equipment, significantly reducing auxiliary time and avoiding heat transfer during the process. This system effectively controls resin content and reduces resin loss and positioning deviation. By implementing heating and pressurization in stages, pressurization is initiated only after the prepreg temperature reaches the preset molding temperature. This avoids premature pressurization at low temperatures, which can cause resin to be squeezed out before it has fully flowed. Simultaneously, the temperature sensor array 5 provides real-time temperature feedback throughout the heating process, ensuring that the entire mold cavity reaches a uniform preset temperature before pressurization begins. This guarantees consistent resin flow during pressurization, allowing the resin to evenly fill fiber gaps and significantly improving fiber volume fraction and interlayer bonding quality. By maintaining the preset curing temperature and pressure, the prepreg is cured and molded. Heating is stopped, and the temperature drops to the preset demolding temperature before releasing the pressure inside the annular airbag 31 and opening the mold to remove the molded component. The entire process of heating, pressurizing, pressure holding and curing, and cooling and depressurization is automatically completed within the same device according to a set program. This achieves precise reproduction of molding process parameters and high batch-to-batch consistency, effectively solving the yield fluctuation problems caused by parameter drift and human error in traditional multi-equipment segmented operations, significantly improving production efficiency and product qualification rate.

[0042] Specifically, in step S3, the first embedded self-heating unit 12 heats the molding cavity 4 to 180°C at a heating rate of 5-15°C / min; in step S4, compressed air is introduced into the annular airbag 31 at a pressurization rate of 0.1MPa / s to a pressure of 0.6MPa; in step S5, the temperature is maintained at 180°C and 0.6MPa for 90 minutes; and in step S6, the temperature is cooled to below 60°C at a cooling rate of 2°C / min.

[0043] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An integrated self-heating airbag pressurized composite molding device, characterized in that, It includes a lower mold assembly (1), an upper mold assembly (2) and an airbag pressurization assembly (3). The airbag pressurization assembly (3) is disposed in the molding cavity (4) formed between the lower mold assembly (1) and the upper mold assembly (2). A temperature sensor array (5) is disposed on the lower mold assembly (1). The lower mold assembly (1) includes a lower mold base (11), a first embedded self-heating unit (12) is provided inside the lower mold base (11), and a lower mold forming surface (13) is formed on the upper surface of the lower mold base (11). The airbag pressurization assembly (3) includes an annular airbag (31), which is disposed in the molding cavity (4), and an air passage interface (32) is provided on one side of the annular airbag (31). The temperature sensor array (5) is composed of multiple K-type thermocouples (51), and each K-type thermocouple (51) is embedded inside the lower mold base (11).

2. The integrated self-heating airbag pressurized composite molding device according to claim 1, characterized in that, The upper mold assembly (2) includes an upper mold base (21), a second embedded self-heating unit (22) is provided inside the upper mold base (21), and a temperature sensor array (5) is provided on the upper mold base (21).

3. The integrated self-heating airbag pressurized composite molding device according to claim 2, characterized in that, The lower mold base (11) has a first insert groove (14) formed on its upper part. The bottom of the first insert groove (14) is the lower mold forming surface (13). The upper mold base (21) has a second insert groove (24) formed on its lower part. The upper part of the second insert groove (24) is the upper mold forming surface (23). A forming cavity (4) is formed between the first insert groove (14) and the second insert groove (24).

4. The integrated self-heating airbag pressurized composite molding device according to claim 1, characterized in that, It also includes a vacuum pumping assembly (6), which includes a vacuum pumping channel (61) and a vacuum interface (62). The vacuum pumping channel (61) is located inside the lower mold base (11). One end of the vacuum pumping channel (61) is located at the edge of the lower mold forming surface (13), and the other end of the vacuum pumping channel (61) extends to the outer surface of the lower mold base (11) to form a vacuum interface (62).

5. The integrated self-heating airbag pressurized composite molding device according to claim 1, characterized in that, It also includes a precision positioning guide assembly (7), which includes a conical positioning guide post (71) and a precision guide sleeve (72). The conical positioning guide post (71) is located at the four corners of the upper mold base (21), and the precision guide sleeve (72) is located at the corresponding position of the lower mold base (11).

6. The integrated self-heating airbag pressurized composite molding device according to claim 1, characterized in that, It also includes a collaborative control component (8), which includes a temperature control module (81), a gas control module (82) and a vacuum control module (83). The temperature control module (81) is electrically connected to the first embedded self-heating unit (12) and the temperature sensor array (5). The gas control module (82) is connected to the gas path interface (32). The vacuum control module (83) is connected to the vacuum pumping component (6).

7. The integrated self-heating airbag pressurized composite molding device according to claim 1, characterized in that, The first embedded self-heating unit (12) and the second embedded self-heating unit (22) are both serpentine resistance wire arrays. The serpentine resistance wire arrays are embedded in the lower mold base (11) and the upper mold base (21) at a distance of 8-12 mm from the corresponding forming surface. The power density of the serpentine resistance wire arrays is 8-15 W / cm².

8. The integrated self-heating airbag pressurized composite molding device according to claim 1, characterized in that, The lower mold base (11) and the upper mold base (21) are respectively divided into multiple independent temperature control zones, and the serpentine resistance wires in each independent temperature control zone are independently electrically connected to each other to achieve independent zone control.

9. A method for molding an integrated self-heating airbag pressurized composite material, characterized in that, The integrated self-heating airbag pressurized composite molding device, as described in any one of claims 1-8, comprises the following steps: S1. Lay the multi-layer prepreg on the lower mold forming surface (13) in the predetermined layup order; S2. Place the annular airbag (31) on the multilayer prepreg, then close the upper mold assembly (2) and the lower mold assembly (1), and connect the external air source to the annular airbag (31) through the air passage interface (32). S3. Start the first embedded self-heating unit (12) to heat the lower mold forming surface (13) and the forming cavity (4), and monitor the temperature in real time through the temperature sensor array (5); S4. Compressed air is introduced into the annular airbag (31) through the air passage interface (32) to expand the annular airbag (31) and compress the prepreg in the molding cavity (4) to achieve uniform pressure. S5. Maintain the preset curing temperature and pressure to allow the prepreg to cure and solidify. S6. Stop heating and wait for the temperature to drop to the preset demolding temperature. Release the pressure inside the annular airbag (31) and open the mold to remove the molded component.

10. The integrated self-heating airbag pressurized composite molding method according to claim 9, characterized in that, In step S3, the first embedded self-heating unit (12) heats the molding cavity (4) to 180°C at a heating rate of 5-15°C / min; in step S4, compressed air is introduced into the annular airbag (31) at a pressurization rate of 0.1MPa / s to a pressure of 0.6MPa. In step S5, the temperature is maintained at 180℃ and 0.6MPa for 90 min; in step S6, the temperature is reduced to below 60℃ at a cooling rate of 2℃ / min.

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