Thermoplastic fiber reinforced composite material mold pressing process method and production line based on thermal diaphragm preforming

Abstract

The invention provides a thermoplastic fiber reinforced composite material mould pressing process method and production line based on thermal diaphragm preforming, which comprehensively optimizes and improves the aspects of a multi-process mould pressing process flow adopting thermal diaphragm forming, production line design, equipment material selection and the like. And the finished product quality of a fiber reinforced composite material product can be effectively improved, the large-scale production efficiency is remarkably improved, the labor cost and the material loss are reduced, multiple defects of an existing thermal diaphragm forming mode are overcome, and design and manufacturing of novel advanced vehicles or aircrafts are facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermoplastic fiber reinforced composite material forming, and particularly relates to a forming process method and a corresponding production line of fiber reinforced composite materials adopting a thermal diaphragm preforming process. Background Art

[0002] At present, the forming methods for thermoplastic composites containing carbon fibers in this field mainly include: autoclave forming, compression molding, resin transfer digital molding (RTM) and its derivative processes (such as HP-RTM), vacuum bag forming, thermal diaphragm forming, etc. Among them, the thermal diaphragm forming process can achieve higher local processing accuracy through the pressure of a flexible diaphragm in cooperation with the regulation of temperature and pressure, has better geometric adaptability to complex structures and production efficiency compared with the above other methods, and also has certain advantages in terms of material utilization rate and production cost. However, there are still some defects in the existing thermal diaphragm forming that need to be improved. For example: ① Products manufactured by using the traditional single-layer diaphragm (such as silica gel film) process generally have the problem of easy aging under high-temperature conditions, and at the same time, the low elastic modulus index often leads to uneven pressure transmission; ② The static molds used in the existing process do not have the ability to compensate for the deformation of the diaphragm, resulting in complex curved surface components such as aircraft air intakes being prone to form wrinkles and being difficult to eliminate subsequently; ③ There is still a large room for improvement in the integration and efficiency of the existing thermal diaphragm forming production line. Summary of the Invention

[0003] In view of this, aiming at the technical problems existing in this field, the present invention provides a compression molding process method for thermoplastic fiber reinforced composite materials based on thermal diaphragm preforming, which specifically includes the following steps:

[0004] Step 1: Perform scanning measurement and cutting operations on the thermoplastic fiber reinforced composite prepreg according to the mold shape.

[0005] Step 2: Transfer the cut prepreg to the laying station, preheat the prepreg by infrared and perform thermal diaphragm laying operation under the action of vacuum adsorption, so that the prepreg is tightly pressed and attached to the upper surface of the thermal diaphragm.

[0006] Step 3: Transfer the completed-laid prepreg and the thermal diaphragm to the vacuum compression preforming mold, apply a positive air pressure below the thermal diaphragm and a negative pressure above the prepreg after closing the mold, and at the same time execute a preset program to heat up the mold, so as to realize the pre-compaction of the prepreg and the thermal diaphragm.

[0007] Step 4: Flip the pre-compacted prepreg and the vacuum compression preforming mold together. If secondary processing of the prepreg is required, execute the pre-compaction process again, otherwise transfer to Step 5.

[0008] Step 5: Open the mold and transfer the vacuum molding preforming upper mold and the prepreg to the preheating buffer furnace. After heating according to the preset temperature increase range and speed to reach the preset temperature in the buffer furnace, temporarily store the upper mold and the prepreg and maintain the corresponding temperature conditions;

[0009] Step 6: Use a transfer vehicle to provide an airtight and heat-insulating environment to transfer the upper mold and prepreg to a hot press;

[0010] Step 7: Use a hot press to perform high-temperature and high-pressure molding, and after the prepreg is cured, open the mold and transfer the upper mold and the fiber-reinforced composite material to a cooling station;

[0011] Step 8: Cool the upper mold and the fiber reinforced composite material according to a preset temperature reduction range and speed, and demould the processed fiber reinforced composite material after it drops to a predetermined temperature.

[0012] Furthermore, the thermoplastic fiber reinforced composite material preferably adopts thermoplastic carbon fiber prepreg, and thermoplastic prepregs such as glass fiber or aramid fiber can also be selected; the thermal insulation membrane specifically selects single-layer or multi-layer PTFE heat-resistant film material.

[0013] Furthermore, in step one, laser scanning is specifically used to detect the shape and edge of the prepreg, which is used to calculate the thermal shrinkage compensation amount of the material in the subsequent steps and guide the cutting operation; the cutting operation is performed using a multi-axis CNC cutting machine, and the cutting path is corrected by visual means.

[0014] Furthermore, in step 2, during paving, the tension of the thermal diaphragm is adjusted in real time based on the change in the width of the prepreg, and the feeding speed is adjusted based on the change in the vacuum adsorption conditions.

[0015] Furthermore, in step three, a high-pressure tank is used to apply positive air pressure under the thermal diaphragm, and a vacuum pump is used to form negative pressure above the prepreg; the positive air pressure and the negative pressure are controlled to reach corresponding thresholds, and the pressures are maintained for corresponding times to ensure that bubbles are discharged and the resin in the prepreg flows fully and fills the fiber gaps, and then the positive air pressure is increased to a predetermined level.

[0016] Furthermore, in step 4, the mold position is synchronously detected when flipping is performed, and an airtightness test is performed on the vacuum molding pre-forming mold after the flipping is completed to ensure the internal environment of the mold during the secondary processing.

[0017] Furthermore, in step five, the preheating buffer furnace specifically adopts a multi-temperature zone segmentation method to increase the temperature in the furnace; the furnace also provides a nitrogen or inert gas protective environment for the prepreg to prevent the resin in the prepreg from oxidizing.

[0018] Further, in step six, an orbital airtight transfer vehicle driven by a motor is specifically used to transfer the mold and prepreg, and a nitrogen or inert gas protection environment is provided for the prepreg.

[0019] Further, in step seven, the compression molding is specifically performed according to a preset pressure and temperature rise curve; in step eight, the staged cooling is performed according to a predetermined temperature drop range.

[0020] Correspondingly, the present invention also provides a compression molding process production line for thermoplastic fiber-reinforced composites based on thermal diaphragm preforming, which is successively composed of a cutting and blanking station, a thermal diaphragm laying station, a vacuum compression preforming station, a flipping tooling, a preheating buffer furnace, a thermal transfer system, a high-temperature and high-pressure compression molding station, and a cooling station;

[0021] Among them, the cutting and blanking station includes a multi-axis numerical control cutting machine, a laser scanner, and a cutting path vision correction device; the multi-axis numerical control cutting machine is used to cut the thermoplastic fiber-reinforced composite prepreg according to the mold shape along a pre-planned path; the laser scanner is used to detect the shape and edge of the prepreg, calculate the thermal shrinkage compensation amount of the material in subsequent steps, and guide the cutting operation; the cutting path vision correction device is used to correct the cutting path in real time through visual recognition;

[0022] The thermal diaphragm laying station includes an infrared heating type laying machine and a vacuum adsorption workbench; the infrared heating type laying machine is used to heat the prepreg to the corresponding laying temperature and adjust the thermal diaphragm tension and feeding speed in real time; the vacuum adsorption workbench is used to provide a vacuum adsorption force to make the prepreg closely fit with the thermal diaphragm;

[0023] The vacuum compression preforming station includes a preforming mold, a high-pressure tank, and a vacuum pump; the preforming mold is used for infrared heating and mold closing to pre-compact the prepreg and the thermal diaphragm; the high-pressure tank is used to apply a positive air pressure below the thermal diaphragm; the vacuum pump is used to form a negative pressure above the prepreg;

[0024] The flipping tooling is used to flip the vacuum compression preforming mold 180° up and down, and is equipped with a detection device for the mold position and airtightness;

[0025] The preheating buffer furnace is used to heat in a multi-temperature zone segmented manner, buffer the pre-compacted prepreg and the upper mold of the preforming mold placed in it, and provide a nitrogen or inert gas protection environment;

[0026] The thermal transfer system includes a track system and a motor-driven airtight transfer vehicle, which is used to transfer the prepreg and the upper mold of the vacuum compression preforming mold to the high-temperature and high-pressure compression molding station, and provide a nitrogen or inert gas protection environment for the prepreg during the transfer process;

[0027] The hot pressing and molding station at high temperature and high pressure includes a hot press, a hot pressing die, an embedded heater, a circulating oil cooling system, and a servo hydraulic system; the hot pressing die is used to open and close the die according to a predetermined pressure curve under the drive of the hot press, and the upper die of the vacuum molding preform die is used as a part of the hot pressing die; the embedded heater is used to heat the molding process according to a predetermined temperature rising curve; the servo hydraulic system is used to drive the opening and closing of the hot pressing die; the circulating oil cooling system is used to adjust the temperature during the molding process;

[0028] The cooling station includes a water-cooled jacket, which is used to automatically wrap the upper die and the fiber-reinforced composite material and perform staged cooling according to a preset temperature reduction range and speed.

[0029] The above-mentioned hot pressing process method and production line of thermoplastic fiber-reinforced composite materials based on thermal diaphragm preforming can effectively improve the finished product quality of fiber-reinforced composite material products, significantly improve the large-scale production efficiency, reduce the labor cost and material loss, and then overcome many deficiencies of the existing thermal diaphragm forming method by comprehensively optimizing and improving the multi-process hot pressing process flow, production line design, and equipment material selection using thermal diaphragm forming, and is beneficial to the design and manufacture of new advanced vehicles or aircraft. Description of the Drawings

[0030] Figure 1 It is a flowchart of the method provided by the present invention. Detailed Embodiments

[0031] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0033] The hot pressing process method of thermoplastic fiber-reinforced composite materials based on thermal diaphragm preforming provided by the present invention, as Figure 1 shown, specifically includes the following steps:

[0034] Step 1: Preferably, use thermoplastic carbon fiber prepreg. Glass fiber or aramid fiber thermoplastic prepreg can also be selected. The thermal diaphragm is specifically selected as a single-layer or multi-layer PTFE heat-resistant film material with a specific thickness of 50μm and a temperature resistance of over 200°C. Before cutting, first use laser scanning to detect the shape and edges of the prepreg to calculate the thermal shrinkage compensation amount of the material in the subsequent steps and guide the cutting operation. The prepreg roll is sent to a five-axis CNC cutting machine through a guide roller, and the cutting path is automatically planned according to the CAD model and executed. During the process, the downward pressure speed of the tool head is maintained at 0.5m / s and the pressure is 100N, and the cutting path is corrected visually to ensure that the cutting accuracy is within the range of ±0.1mm, and the tension is controlled at 50 - 80N to prevent fiber delamination or burrs during cutting.

[0035] Step 2: Transfer the cut prepreg to the laying station, and heat the prepreg through the infrared heating area of the laying machine at a power density of 500W / m 2 to reach the laying temperature condition of 30 - 50°C to reduce the resin viscosity. At the same time, under the action of a vacuum adsorption workbench, perform the thermal diaphragm laying operation, so that the prepreg is pressed and adhered to the upper surface of the thermal diaphragm and the air between the two is eliminated. During the process, control the tension within the range of 20 - 50N, and the synchronous feeding speed is 0.3 - 0.8m / min. The laying can be carried out in a two-station or multi-station manner to further improve production efficiency.

[0036] Step 3: Transfer the prepreg and thermal diaphragm that have completed laying to a vacuum molding preforming mold. After closing the mold, heat up and use a high-pressure tank to apply a positive air pressure below the thermal diaphragm. First, apply 0.2MPa and then hold the pressure for 5 - 8min to completely discharge the bubbles and make the resin in the prepreg flow fully to fill the fiber gaps, and then stepwise increase the pressure to 0.8MPa; during the process, at the same time, use a vacuum pump above the prepreg to form a negative pressure at a pumping rate of ≥50m 3 / h, so that the vacuum degree reaches -0.09~-0.098Mpa and is maintained for 3 - 5min. The vacuum molding preforming mold can be selected with a split modular design, the surface is treated with hard chromium plating, and the roughness is selected as Ra≤0.05μm.

[0037] Step 4: Use a flipping mechanism in the form of a hydraulic drive gear rack with a positioning accuracy within the range of ±0.02mm to flip the pre-compacted prepreg and the vacuum molding preforming mold together by 180° up and down, and complete the flipping action within 10s. If secondary processing of the prepreg is required, perform the pre-compaction process again, otherwise transfer to Step 5. After each flipping, perform an airtightness test on the vacuum molding preforming mold to ensure that the pressure test value at the mold sealing ring is ≥0.1Mpa, and determine the mold position change according to the fit tolerance of the positioning pins on the mold or using an optoelectronic sensor to ensure the mold environment during secondary processing.

[0038] Step 5: Mold opening. Transfer the vacuum molding preform upper mold and the prepreg to the preheating buffer furnace together. There are 3 - 5 temperature zones in the furnace, which are heated independently through PID control. Multistage heating is performed and the temperature is monitored by thermocouples. Finally, a temperature gradient distribution of 40°C in the inlet zone → 100°C in the middle zone → 180°C in the outlet zone is achieved in the furnace. During the process, nitrogen is provided to protect the environment inside the furnace to control the oxygen content ≤ 500 ppm, thereby effectively preventing the resin in the prepreg from oxidizing. After the temporary storage is completed, the upper mold and the prepreg are transferred to the transfer cart through an adjustable-speed conveyor belt;

[0039] Step 6: The transfer cart is driven by a motor to move along the track system towards the high-temperature and high-pressure molding station. At the same time, a nitrogen gas tight environment with a flow rate of 10 - 20 L / min is provided, as well as a heat preservation environment to control the temperature fluctuation of the upper mold and the prepreg within ±10°C, so that the upper mold and the prepreg are transferred within 90 s;

[0040] Step 7: Use a 500 - 2000T hot press to perform high-temperature and high-pressure molding. The vacuum molding preform upper mold serves as the lower mold of the hot press mold at this time, and together with the upper mold of the hot press mold, it is driven by the servo hydraulic system of the hot press to close the mold at a speed of 5 mm / s. During the process, the pressure curve is set as: 0 → 10 MPa (0 - 2 min) → hold pressure at 18 MPa (10 - 15 min). After heating up to 180°C, start constant-temperature curing. After the prepreg is cured, open the mold, and transfer the upper mold and the fiber-reinforced composite material to the cooling station by a manipulator, or first send it to the quality inspection station for further inspection;

[0041] Step 8: The water-cooled jacket at the cooling station automatically wraps the upper mold and the fiber-reinforced composite material to start staged cooling. The first stage is from 180°C to 120°C at a cooling rate of 15°C / min for 8 min; the second stage is from 120°C to 60°C at a cooling rate of 10°C / min for 12 min. Finally, the processed fiber-reinforced composite material is demolded by a hydraulic ejection mechanism.

[0042] The finished fiber-reinforced composite material after cooling and demolding can be transferred to the quality inspection station for quality inspection of surface scratches, deformation, etc.

[0043] Correspondingly, the present invention also provides a hot-pressing process production line for thermoplastic fiber-reinforced composite materials based on thermal diaphragm preforming for implementing the above method, which is successively composed of a cutting and blanking station, a thermal diaphragm laying station, a vacuum molding preforming station, a flipping tooling, a preheating buffer furnace, a thermal transfer system, a high-temperature and high-pressure molding station, and a cooling station;

[0044] Among them, the cutting and blanking station includes a multi-axis numerical control cutting machine, a laser scanner, and a cutting path vision correction device; the multi-axis numerical control cutting machine is used to cut the thermoplastic fiber reinforced composite prepreg according to the mold shape along a pre-planned path; the laser scanner is used to detect the shape and edge of the prepreg, calculate the thermal shrinkage compensation amount of the material in the subsequent steps, and guide the cutting operation; the cutting path vision correction device is used to correct the cutting path in real time through visual recognition;

[0045] The hot diaphragm laying station includes an infrared heating laying machine and a vacuum adsorption workbench; the infrared heating laying machine is used to heat the prepreg to the corresponding laying temperature and adjust the tension and feeding speed of the hot diaphragm in real time; the vacuum adsorption workbench is used to provide a vacuum adsorption force to make the prepreg closely fit with the hot diaphragm;

[0046] The vacuum molding and preforming station includes a preforming mold, a high-pressure tank, and a vacuum pump; the preforming mold is used for infrared heating and mold closing to pre-compact the prepreg and the hot diaphragm; the high-pressure tank is used to apply a positive air pressure below the hot diaphragm; the vacuum pump is used to form a negative pressure above the prepreg;

[0047] The flipping tooling is used to flip the vacuum molding and preforming mold up and down by 180°, and is equipped with a detection device for the mold position and airtightness;

[0048] The preheating buffer furnace is used to heat in a multi-temperature zone segmented manner, buffer the pre-compacted prepreg and the upper mold of the preforming mold placed in it, and provide a nitrogen or inert gas protection environment;

[0049] The hot transfer system includes a track system and a motor-driven airtight transfer vehicle, which is used to transfer the prepreg and the upper mold of the vacuum molding and preforming mold to the high-temperature and high-pressure molding station, and provide a nitrogen or inert gas protection environment for the prepreg during the transfer process;

[0050] The high-temperature and high-pressure molding station includes a hot press, a hot press mold, an embedded heater, a circulating oil cooling system, and a servo hydraulic system; the hot press mold is used to open and close the mold according to a predetermined pressure curve, and the upper mold of the vacuum molding and preforming mold is used as part of the hot press mold; the embedded heater is used to heat the molding process according to a predetermined temperature rise curve; the servo hydraulic system is used to drive the opening and closing of the hot press mold; the circulating oil cooling system is used to adjust the temperature during the molding process;

[0051] The cooling station includes a water-cooled jacket, which is used to automatically wrap the upper mold and the fiber reinforced composite and perform staged cooling according to a preset cooling rate and speed.

[0052] It should be understood that the magnitudes of the sequence numbers of the steps in the embodiments of the present invention do not mean the order of execution is prior or subsequent. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0053] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermoplastic fiber reinforced composite material molding process based on thermal diaphragm preforming, characterized in that: The specific steps include: Step 1: Scan, measure and cut the thermoplastic fiber reinforced composite material prepreg according to the mold shape; Step 2: Move the cut prepreg to the laying station, preheat the prepreg with infrared and perform the hot diaphragm laying operation under vacuum adsorption, so that the prepreg is pressed and adhered to the upper surface of the hot diaphragm; Step 3: Transfer the prepreg and thermal diaphragm that have been laid to the vacuum molding preforming mold. After the mold is closed, positive air pressure is applied to the bottom of the thermal diaphragm and negative pressure is applied to the top of the prepreg. At the same time, the preset program is executed to increase the temperature inside the mold to achieve pre-compaction of the prepreg and the thermal diaphragm. Step 4: Turn over the prepreg material that has been pre-compacted together with the vacuum molding preforming mold. If the prepreg material needs to be processed again, perform the pre-compacting process again, otherwise proceed to step 5; Step 5: Open the mold and transfer the vacuum molding preforming upper mold and the prepreg to the preheating buffer furnace. After heating according to the preset temperature increase amplitude and speed to reach the predetermined temperature in the buffer furnace, temporarily store the upper mold and the prepreg and maintain the corresponding temperature conditions; Step 6: Use a transfer vehicle to provide an airtight and heat-insulating environment to transfer the upper mold and prepreg to a hot press; Step 7: Perform high-temperature and high-pressure molding by using a hot press, and after the prepreg is cured, open the mold and transfer the upper mold and the fiber-reinforced composite material to a cooling station; Step eight, cooling the upper mold and the fiber reinforced composite material according to a preset temperature reduction amplitude and speed, and demoulding the processed fiber reinforced composite material after the temperature drops to a predetermined temperature.

2. The method according to claim 1, characterized in that: The thermoplastic fiber reinforced composite material adopts any one of thermoplastic carbon fiber, glass fiber and aramid fiber thermoplastic prepreg; the thermal insulation membrane specifically adopts single-layer or multi-layer PTFE heat-resistant film material.

3. The method according to claim 1, characterized in that: In step one, laser scanning is specifically used to detect the shape and edge of the prepreg, which is used to calculate the thermal shrinkage compensation amount of the material in the subsequent steps and guide the cutting operation; the cutting operation is performed by a multi-axis CNC cutting machine, and the cutting path is corrected by visual means.

4. The method according to claim 1, characterized in that: In step 2, during paving, the tension of the thermal diaphragm is adjusted in real time based on the change in the width of the prepreg, and the feeding speed is adjusted based on the change in the vacuum adsorption conditions.

5. The method according to claim 1, characterized in that: In step three, a high-pressure tank is used to apply positive air pressure under the thermal diaphragm, and a vacuum pump is used to form negative pressure above the prepreg; the positive air pressure and negative pressure are controlled to reach corresponding thresholds, and the pressures are maintained for corresponding time to ensure that bubbles are discharged and the resin in the prepreg flows fully and fills the fiber gaps, and then the positive air pressure is increased to a predetermined level.

6. The method according to claim 1, characterized in that: Step 4: synchronously detect the mold position when performing flipping, and perform airtightness detection on the vacuum molding pre-forming mold after flipping is completed to ensure the internal environment of the mold during secondary processing.

7. The method according to claim 1, characterized in that: In step 5, the preheating buffer furnace specifically adopts a multi-temperature zone segmentation method to increase the temperature in the furnace; the furnace also provides a nitrogen or inert gas protection environment for the prepreg to prevent the resin in the prepreg from oxidizing.

8. The method according to claim 1, characterized in that: Step six specifically uses a motor-driven rail-type airtight transfer vehicle to transfer the mold and prepreg, and provides a nitrogen or inert gas protection environment for the prepreg during the transfer process.

9. The method according to claim 1, characterized in that: In step seven, compression molding is performed according to a preset pressure and temperature rise curve; in step eight, staged cooling is performed according to a predetermined temperature drop interval.

10. A thermoplastic fiber reinforced composite material molding process production line based on thermal diaphragm preforming according to any one of claims 1 to 9, characterized in that: It consists of cutting and blanking station, hot diaphragm laying station, vacuum molding preforming station, turning tooling, preheating buffer furnace, heat transfer system, high temperature and high pressure molding station and cooling station. Among them, the cutting and blanking station includes a multi-axis CNC cutting machine, a laser scanner and a cutting path visual correction device; the multi-axis CNC cutting machine is used to cut the thermoplastic fiber reinforced composite prepreg according to the mold shape in a pre-planned path; the laser scanner is used to detect the shape and edge of the prepreg, and is used to calculate the thermal shrinkage compensation amount of the material in the subsequent steps and guide the cutting operation; the cutting path visual correction device is used to correct the cutting path in real time by visual recognition; The thermal diaphragm laying station includes an infrared heating laying machine and a vacuum adsorption workbench; the infrared heating laying machine is used to heat the prepreg to the corresponding laying temperature and adjust the thermal diaphragm tension and feeding speed in real time; the vacuum adsorption workbench is used to provide vacuum adsorption force to make the prepreg and the thermal diaphragm fit closely; The vacuum molding preforming station includes a preforming mold, a high-pressure tank, and a vacuum pump; the preforming mold is used for infrared heating and mold closing to pre-compact the prepreg and the thermal diaphragm; the high-pressure tank is used to apply positive air pressure to the bottom of the thermal diaphragm; the vacuum pump is used to form negative pressure above the prepreg; The turning tool is used to turn the vacuum molding pre-forming mold upside down 180 degrees, and has a mold position and air tightness detection device; The preheating buffer furnace is used to heat in a multi-temperature zone segmented manner, buffer the pre-compacted prepreg and preform mold upper mold placed therein, and provide a nitrogen or inert gas protection environment; The hot transfer system includes a rail system and a motor-driven airtight transfer vehicle, which is used to transfer the prepreg and the upper mold of the vacuum molding preform mold to the high-temperature and high-pressure molding forming station, and provide a nitrogen or inert gas protection environment for the prepreg during the transfer process; The high-temperature and high-pressure molding station includes a hot press, a hot press mold, an embedded heater, a circulating oil cooling system and a servo hydraulic system; the hot press mold is used to open and close the mold according to a predetermined pressure curve under the drive of the hot press, and the upper mold of the vacuum molding preforming mold is used as a part of the hot press mold; the embedded heater is used to heat the molding process according to a predetermined temperature rise curve; the servo hydraulic system is used to drive the hot press mold to open and close; the circulating oil cooling system is used to adjust the temperature during the molding process; The cooling station includes a water-cooling jacket, which is used to automatically wrap the upper mold and fiber-reinforced composite material and cool it in stages according to the preset temperature reduction range and speed.

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