A composite material forming mold injection pipeline system and its injection method

Abstract

The present invention relates to an injection pipeline system for a composite material forming mold. Among them, a first vacuum source is connected to a resin degassing barrel through a degassing device vacuum cut-off valve, and a degassing device resin cut-off valve is arranged at the output port of the resin degassing barrel; a gas pressure balance valve is arranged on the resin degassing barrel, and the output end of the resin degassing barrel is connected to the input end of a glue injection pipeline, and the output end of the glue injection pipeline is used to be connected to the input end of the forming mold. A high-pressure air source is connected to the glue injection pipeline through a first connecting pipe, and a pressure electro-hydraulic proportional valve, a gas pressure cut-off valve, and a pressure pipeline cut-off valve are arranged on the first connecting pipe. The purpose of this injection pipeline system for the composite material forming mold is to solve the problem of residual resin cleaning after each injection process of the resin injection device and to monitor the resin consumption in real time during the glue injection process in a high-temperature environment.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid molding of resin matrix composites, and particularly relates to an injection pipeline system for a composite material molding die and an injection method thereof. Background Art

[0002] The Resin Transfer Molding (RTM) technology mainly works as follows: First, a preform designed is placed in the mold cavity, and then a special resin system is injected into the mold cavity by an injection device. The resin flows to expel the gas in the mold cavity and infiltrate the fibers at the same time. After heating and curing and cooling and demolding, a composite material part can be obtained. When injecting resin, the injection device applies pressure to the resin and transfers the resin to the mold cavity through the injection pipeline. Since the injection device needs to be used repeatedly, after each injection process is completed, a solvent needs to be used to clean the resin residues adhered to the device and the fixed pipeline. The steps are cumbersome and bring subsequent solvent treatment problems. In addition, if the resin injection device is in a high-temperature environment as a whole, it is difficult to measure the amount of resin used in the injection device by the measurement method at normal temperature, and it is impossible to intuitively predict the end time point of the injection process. In order to ensure the normal completion of the injection process, only the amount of resin used in the device can be increased, resulting in waste of resin.

[0003] Therefore, the inventor provides an injection pipeline system for a composite material molding die and an injection method thereof. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] The embodiment of the present invention provides an injection pipeline system for a composite material molding die and an injection method thereof, which solve the technical problems of cleaning the residual resin after each injection process of the resin injection device and real-time monitoring of the resin consumption during the injection process in a high-temperature environment.

[0006] (2) Technical Solutions

[0007] The present invention provides an injection pipeline system for a composite material molding die, including a first vacuum source, a gas pressure balance valve, a vacuum cut-off valve for the degassing device, a resin degassing barrel and a resin cut-off valve for the degassing device, a high-pressure gas source, a pressure electro-pneumatic proportional valve, a gas pressure cut-off valve, a pressure pipeline cut-off valve, an injection pipeline, a melt pressure sensor, an injection port cut-off valve and a programmable logic controller; wherein,

[0008] The first vacuum source is communicated with the resin degassing barrel through the degassing device vacuum stop valve, and the degassing device resin stop valve is arranged at the output port of the resin degassing barrel; the gas pressure balance valve is arranged on the resin degassing barrel, the output end of the resin degassing barrel is communicated with the input end of the glue injection pipeline, the output end of the glue injection pipeline is used for being communicated with the input end of the molding die, the high-pressure air source is communicated with the glue injection pipeline through a first connecting pipe, and the first connecting pipe is provided with the pressure electro-hydraulic proportional valve, the gas pressure stop valve and the pressure pipeline stop valve;

[0009] The glue injection pipeline is communicated with the glue injection port of the molding die through the glue injection port stop valve, the melt pressure sensor is arranged on a branch at the rear end of the glue injection pipeline and is connected with the programmable logic controller, and the pressure electro-hydraulic proportional valve is connected with the programmable logic controller.

[0010] Further, the composite material molding die injection pipeline system further includes a sensor transmitter, and the melt pressure sensor is connected with the programmable logic controller through the sensor transmitter.

[0011] Further, the composite material molding die injection pipeline system further includes an industrial control computer, and the industrial control computer is connected with the programmable logic controller.

[0012] Further, the composite material molding die injection pipeline system further includes a glue outlet stop valve and a resin collection barrel, the resin collection barrel is communicated with the glue outlet of the molding die through a glue outlet pipeline, and the glue outlet stop valve is arranged at the glue outlet of the molding die.

[0013] Further, the composite material molding die injection pipeline system further includes a glue outlet pipeline stop valve, and the glue outlet pipeline stop valve is arranged on the glue outlet pipeline.

[0014] Further, the composite material molding die injection pipeline system further includes a second vacuum source and a vacuum stop valve, and the second vacuum source is communicated with the resin collection barrel through the vacuum stop valve.

[0015] Further, the glue injection pipeline of the composite material molding die injection pipeline system is a stainless steel pressure-resistant corrugated pipe and / or a polytetrafluoroethylene pressure-resistant transparent pipe.

[0016] Further, the composite material molding die injection pipeline system further includes an oven, and the pressure pipeline stop valve, the glue injection pipeline and the melt pressure sensor are all located inside the oven.

[0017] Further, the glue injection pipeline is a single pipeline or a single pipeline formed by connecting multiple single pipelines in series, and is fixed on a pipeline support according to a set stacking manner.

[0018] Further, an observation window is provided on the side of the oven, and an industrial camera is provided outside the observation window. The industrial camera is connected to an industrial control computer.

[0019] The present invention also provides an injection method for an injection pipeline system of a composite material forming mold, including the following steps:

[0020] S100. Assemble the resin injection pipeline. Calculate the volume of the resin required according to the inner cavity volume of the forming mold and the volume fraction of the fiber preform. Select injection pipelines with corresponding lengths and connect multiple injection pipelines in series to ensure that the volume inside the pipeline is greater than the volume of the resin required after the fiber preform is filled.

[0021] S200. When the temperature measuring thermocouple on the injection pipeline and the forming mold reaches the preset temperature, open the gas pressure balance valve, the resin cut-off valve of the degassing device, and the pressure pipeline cut-off valve, and close the vacuum cut-off valve of the degassing device, the gas pressure cut-off valve, and the injection port cut-off valve. Introduce the resin after vacuum degassing into the injection pipeline, and close the resin cut-off valve of the degassing device after all the resin flows into the injection pipeline;

[0022] S300. Open the gas pressure cut-off valve and the injection port cut-off valve to start resin injection;

[0023] S400. Control the pressure electro-hydraulic proportional valve through the industrial control computer and the programmable logic controller, introduce high-pressure gas with a specified pressure P1 to apply an injection pressure to the resin in the injection pipeline. At this time, collect the resin pressure P2 of the melt pressure sensor. Take the pressure value P1 of the high-pressure gas driven by the pressure electro-hydraulic proportional valve as the input quantity of the PID controller in the programmable logic controller, and take the resin pressure P2 measured by the melt pressure sensor as the output quantity of the PID controller in the programmable logic controller. Adjust the high-pressure gas pressure P1 through the pressure electro-hydraulic proportional valve to control the resin pressure P2 measured by the melt pressure sensor to be equal to the injection process pressure Pt set in the industrial control computer at the t moment after the start of the injection process;

[0024] S500. When the industrial camera monitors that the gas-liquid interface of the resin reaches the specified position, close the injection port cut-off valve.

[0025] S600. Close the pressure pipeline cut-off valve, the injection port cut-off valve, the resin outlet cut-off valve, the resin outlet pipeline cut-off valve, and the vacuum cut-off valve, and take out the melt pressure sensor and the resin collection bucket;

[0026] S700. Raise the air temperature of the oven to raise the forming mold to the curing temperature and complete the entire resin curing process, and at the same time cure the residual resin in the injection pipeline;

[0027] Cool down the oven. After the forming mold has cooled down, remove the mold. Disconnect the injection pipeline to complete the preparation of the composite part.

[0028] (3)Advantages

[0029] In summary, the present invention uses low-cost disposable injection pipeline consumables to replace the dedicated resin injection device. After each injection process, the injection pipeline can be directly cured in the composite curing furnace along with the furnace, improving the injection process efficiency and reducing the usage of cleaning solvents. At the same time, the resin for injection is stored in the injection pipeline stacked in a certain manner. While replacing the resin injection device, the real-time monitoring of the injection process in a high-temperature environment can be completed by observing the real-time usage amount of the resin in the transparent pipeline. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments of the present invention. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of an injection pipeline system for a composite material forming mold provided by an embodiment of the present invention.

[0032] In the figure:

[0033] 1 - First vacuum source; 2 - Gas pressure balance valve; 3 - Vacuum cut-off valve for degassing device; 4 - Resin degassing bucket; 5 - Resin cut-off valve for degassing device; 6 - High-pressure gas source; 7 - Pressure electro-pneumatic proportional valve; 8 - Gas pressure cut-off valve; 9 - Pressure pipeline cut-off valve; 10 - Injection pipeline; 11 - Melt pressure sensor; 12 - Sensor transmitter; 13 - Forming mold; 14 - Injection port cut-off valve; 15 - Outlet cut-off valve; 16 - Fiber preform; 17 - Resin collection bucket; 18 - Outlet pipeline cut-off valve; 19 - Second vacuum source; 20 - Vacuum cut-off valve; 21 - Programmable logic controller; 22 - Industrial control computer; 23 - Oven, 24 - Observation window, 25 - Industrial camera. Detailed Embodiments

[0034] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments, and covers any modifications, replacements, and improvements of parts, components, and connection methods without departing from the spirit of the present invention.

[0035] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will describe the present application in detail with reference to the drawings and in combination with the embodiments.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the products of the present invention are usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It 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 should not be construed as a limitation to the present invention.

[0037] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "set" and "installed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Figure 1 is a schematic structural diagram of an injection pipeline system of a composite material forming mold provided by an embodiment of the present invention. The system may include a first vacuum source 1, a gas pressure balance valve 2, a degassing device vacuum cut-off valve 3, a resin degassing bucket 4 and a degassing device resin cut-off valve 5, a high-pressure air source 6, a pressure electro-pneumatic proportional valve 7, a gas pressure cut-off valve 8, a pressure pipeline cut-off valve 9, a glue injection pipeline 10, a melt pressure sensor 11, a glue injection port cut-off valve 14, and a programmable logic controller 21; wherein,

[0039] The first vacuum source 1 is communicated with the resin degassing bucket 4 through the degassing device vacuum cut-off valve 3, and the degassing device resin cut-off valve 5 is arranged at the output port of the resin degassing bucket 4; the gas pressure balance valve 2 is arranged on the resin degassing bucket 4, and the output end of the resin degassing bucket 4 is communicated with the input end of the glue injection pipeline 10. The output end of the glue injection pipeline 10 is used for communicating with the input end of the forming mold 13. The high-pressure air source 6 is communicated with the glue injection pipeline 10 through a first connecting pipe, and a pressure electro-pneumatic proportional valve 7, a gas pressure cut-off valve 8, and a pressure pipeline cut-off valve 9 are arranged on the first connecting pipe;

[0040] The glue injection pipeline 10 is communicated with the glue injection port of the forming mold 13 through the glue injection port cut-off valve 14. The melt pressure sensor 11 is arranged on the branch at the rear end of the glue injection pipeline 10 and is connected to the programmable logic controller 21, and the pressure electro-pneumatic proportional valve 7 is connected to the programmable logic controller 21.

[0041] In the above embodiment, as Figure 1As shown in the figure, the front end of the injection pipeline 10 is connected to the resin degassing barrel 4 and the high-pressure gas source 6 respectively through a tee joint. A gas pressure cut-off valve 8 and a pressure electro-pneumatic proportional valve 7 are connected between the front end of the injection pipeline 10 and the high-pressure gas source 6. A degassing device resin cut-off valve 5 is connected between the front end of the injection pipeline 10 and the degassing device. A pressure pipeline cut-off valve 9 is connected between the front end of the injection pipeline 10 and the tee joint. The rear end of the injection pipeline 10 is connected to an injection port cut-off valve 14 at the injection port of the molding die 13. The melt pressure sensor 11 is connected to a branch at the rear end of the injection pipeline 10 through a tee joint.

[0042] Among them, the injection pipeline 10 is a single pipeline or a single pipeline formed by connecting multiple single pipelines in series. One possible stacking method is to fix it on the pipeline support in a single-layer spiral winding manner.

[0043] This injection pipeline system does not require a dedicated resin injection device during the injection stage. It uses low-cost injection pipeline consumables for single use to replace the dedicated resin injection device. After each injection process, the injection pipeline can be directly cured in the composite material curing furnace along with the furnace, which improves the injection process efficiency and reduces the usage amount of cleaning solvents.

[0044] As an alternative implementation, as Figure 1 shown, the composite material molding die injection pipeline system further includes a sensor transmitter 12. The melt pressure sensor 11 is connected to the programmable logic controller 21 through the sensor transmitter 12. Among them, through the sensor transmitter 12, the electrical signal obtained by the melt pressure sensor 11 can be further amplified to ensure that the programmable logic controller 21 can obtain more accurate real-time data.

[0045] As an alternative implementation, as Figure 1 shown, the composite material molding die injection pipeline system further includes an industrial control computer 22. The industrial control computer 22 is connected to the programmable logic controller 21.

[0046] As an alternative implementation, as Figure 1 shown, the composite material molding die injection pipeline system further includes a glue outlet cut-off valve 15 and a resin collection barrel 17. The resin collection barrel 17 is communicated with the glue outlet of the molding die 13 through a glue outlet pipeline. The glue outlet cut-off valve 15 is arranged at the glue outlet of the molding die 13. Specifically, the resin collection barrel 17 can collect the resin flowing out of the molding die 13 from the glue outlet pipeline.

[0047] As an alternative implementation, as Figure 1 shown, the composite material molding die injection pipeline system further includes a glue outlet pipeline cut-off valve 18. The glue outlet pipeline cut-off valve 18 is arranged on the glue outlet pipeline.

[0048] As an alternative implementation, asFigure 1 As shown, the injection pipeline system of the composite material forming mold further includes a second vacuum source 19 and a vacuum cut-off valve 20. The second vacuum source 19 is connected to the resin collection barrel 17 through the vacuum cut-off valve 20.

[0049] Specifically, the injection pipeline 10 and the forming mold 13 are evacuated to a vacuum state through the second vacuum source 19 and the vacuum cut-off valve 20.

[0050] As an alternative embodiment, the injection pipeline 10 of the injection pipeline system of the composite material forming mold is a stainless steel pressure-resistant corrugated pipe and / or a polytetrafluoroethylene pressure-resistant transparent pipe.

[0051] Specifically, the material of the injection pipeline 10 can be a stainless steel pressure-resistant corrugated pipe, a polytetrafluoroethylene pressure-resistant transparent pipe, or a series connection of a stainless steel pressure-resistant corrugated pipe and a tetrafluoroethylene pressure-resistant transparent pipe. The injection pipeline 10 is arranged in a spiral stack, which can increase the length of the pipeline. When a series pipeline is adopted, a section of the pipeline before the injection port cut-off valve 14 is a transparent section pipeline made of polytetrafluoroethylene pressure-resistant transparent pipe material, and the resin state in the pipeline can be observed through the observation window 24. The remaining series section pipelines can be transparent section pipelines made of polytetrafluoroethylene pressure-resistant transparent pipe material or non-transparent section pipelines made of stainless steel pressure-resistant corrugated pipe material.

[0052] As an alternative embodiment, as Figure 1 shown, the injection pipeline system of the composite material forming mold further includes an oven 23. The pressure pipeline cut-off valve 9, the injection pipeline 10, and the melt pressure sensor 11 are all located inside the oven 23.

[0053] As an alternative embodiment, as Figure 1 shown, an observation window 24 is opened on the side surface of the oven 23. Among them, the industrial camera 25 observes the resin state of the transparent section pipeline in the injection pipeline 10 through the observation window 24 of the oven 23, which can realize the real-time monitoring of the resin usage amount during the injection process in a high-temperature environment. The operator can intuitively judge the end time point of the injection process, avoiding the waste of raw materials caused by leaving a process margin for the resin.

[0054] The embodiment of the present invention also provides an injection method for an injection pipeline system of a composite material forming mold. The method may include the following steps:

[0055] S100. Assemble the resin injection pipeline, calculate the volume of the required resin according to the inner cavity volume of the forming mold 13 and the volume fraction of the fiber preform 16, select the injection pipeline 10 with the corresponding length, connect multiple injection pipelines in series, and ensure that the volume inside the pipeline is greater than the volume of the resin required for the fiber preform 16 to be filled completely;

[0056] S200. When the temperature measuring thermocouple on the injection pipeline 10 and the molding die 13 reaches the preset temperature, open the gas pressure balance valve 2, the resin cut-off valve 5 of the degassing device, and the pressure pipeline cut-off valve 9, close the vacuum cut-off valve 3 of the degassing device, the gas pressure cut-off valve 8, and the injection port cut-off valve 14, and introduce the resin after vacuum degassing into the injection pipeline 10. After all the resin has flowed into the injection pipeline 10, close the resin cut-off valve 5 of the degassing device;

[0057] S300. Open the gas pressure cut-off valve 8 and the injection port cut-off valve 14 to start resin injection;

[0058] S400. Control the pressure electro-pneumatic proportional valve 7 through the industrial control computer 22 and the programmable logic controller 21, introduce high-pressure gas with a specified pressure P1 to apply injection pressure to the resin in the injection pipeline. At this time, collect the resin pressure P2 of the melt pressure sensor 11. Take the pressure value P1 of the high-pressure gas driven by the pressure electro-pneumatic proportional valve 7 as the input of the PID (proportional-integral-derivative) controller in the programmable logic controller 21, and the resin pressure P2 measured by the melt pressure sensor 11 as the output of the PID controller in the programmable logic controller 21. Adjust the high-pressure gas pressure P1 through the pressure electro-pneumatic proportional valve 7 to control the resin pressure P2 measured by the melt pressure sensor 11 to be equal to the injection process pressure Pt set in the industrial control computer 22 at the t moment after the start of the injection process;

[0059] S500. When the industrial camera 25 monitors that the gas-liquid interface of the resin reaches the specified position, close the injection port cut-off valve 14;

[0060] S600. Close the pressure pipeline cut-off valve 9, the injection port cut-off valve 14, the glue outlet cut-off valve 15, the glue outlet pipeline cut-off valve 18, and the vacuum cut-off valve 20, and remove the melt pressure sensor 11 and the resin collection bucket 17;

[0061] S700. Raise the air temperature of the oven 23 to raise the molding die 13 to the curing temperature and complete the entire resin curing process, and at the same time cure the residual resin in the injection pipeline 10;

[0062] S800. Cool down the oven 23. After the molding die 13 cools down, demold, and remove the injection pipeline 10 to complete the preparation of the composite parts.

[0063] It should be clear that each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Also, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0064] The above are only the embodiments of the present application and do not limit the present application. For those skilled in the art, various changes and modifications can be made to the present application without departing from the scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A composite material forming die injection pipeline system, characterized in that, it includes a first vacuum source (1), a gas pressure balance valve (2), a degassing device vacuum cut-off valve (3), a resin degassing bucket (4), a degassing device resin cut-off valve (5), a high-pressure gas source (6), a pressure electro-pneumatic proportional valve (7), a gas pressure cut-off valve (8), a pressure pipeline cut-off valve (9), a glue injection pipeline (10), a melt pressure sensor (11), a glue injection port cut-off valve (14), and a programmable logic controller (21); wherein, the first vacuum source (1) is communicated with the resin degassing bucket (4) through the degassing device vacuum cut-off valve (3), and the degassing device resin cut-off valve (5) is arranged at the output port of the resin degassing bucket (4); the gas pressure balance valve (2) is arranged on the resin degassing bucket (4), the output end of the resin degassing bucket (4) is communicated with the input end of the glue injection pipeline (10), the output end of the glue injection pipeline (10) is used for being communicated with the input end of a forming die (13), the high-pressure gas source (6) is communicated with the glue injection pipeline (10) through a first connecting pipe, and the pressure electro-pneumatic proportional valve (7), the gas pressure cut-off valve (8), and the pressure pipeline cut-off valve (9) are arranged on the first connecting pipe; the glue injection pipeline (10) is communicated with the glue injection port of the forming die (13) through the glue injection port cut-off valve (14), the melt pressure sensor (11) is arranged on a branch at the rear end of the glue injection pipeline (10) and is connected with the programmable logic controller (21), and the pressure electro-pneumatic proportional valve (7) is connected with the programmable logic controller (21); the glue injection pipeline (10) is in a stacked spiral shape and is a series pipeline, and a section of the pipeline before the glue injection port cut-off valve (14) is a transparent section pipeline, and the remaining series section pipelines are transparent section pipelines or non-transparent section pipelines; it further includes an oven (23), and the pressure pipeline cut-off valve (9), the glue injection pipeline (10), and the melt pressure sensor (11) are all located inside the oven (23).

2. The composite material forming die injection pipeline system according to claim 1, characterized in that, it further includes a sensor transmitter (12), and the melt pressure sensor (11) is connected with the programmable logic controller (21) through the sensor transmitter (12).

3. The composite material forming die injection pipeline system according to claim 2, characterized in that, it further includes an industrial control computer (22), and the industrial control computer (22) is connected with the programmable logic controller (21).

4. The composite material forming die injection pipeline system according to claim 3, characterized in that, it further includes a glue outlet cut-off valve (15) and a resin collection bucket (17), the resin collection bucket (17) is communicated with the glue outlet of the forming die (13) through a glue outlet pipeline, and the glue outlet cut-off valve (15) is arranged at the glue outlet of the forming die (13).

5. The composite material forming die injection pipeline system according to claim 4, characterized in that, It further includes a glue outlet pipeline stop valve (18), and the glue outlet pipeline stop valve (18) is arranged on the glue outlet pipeline.

6. The injection pipeline system of the composite material forming mold according to claim 5, characterized in that it further includes a second vacuum source (19) and a vacuum stop valve (20), and the second vacuum source (19) is connected to the resin collection barrel (17) through the vacuum stop valve (20).

7. The injection pipeline system of the composite material forming mold according to claim 6, characterized in that an observation window (24) is opened on the side of the oven (23), and an industrial camera (25) is arranged outside the observation window, and the industrial camera (25) is connected to an industrial control computer (22).

8. An injection method using the injection pipeline system of the composite material forming mold according to claim 7, characterized in that the method includes the following steps: S100. Assemble the resin injection pipeline, calculate the volume of the resin required according to the inner cavity volume of the forming mold and the volume fraction of the fiber preform, select the injection pipeline with the corresponding length, connect multiple injection pipelines in series, and ensure that the volume inside the pipeline is greater than the volume of the resin required after the fiber preform is filled; S200. When the temperature measuring thermocouple on the injection pipeline and the forming mold reaches the preset temperature, open the gas pressure balance valve, the resin stop valve of the degassing device, and the pressure pipeline stop valve, close the vacuum stop valve of the degassing device, the gas pressure stop valve, and the injection port stop valve, introduce the resin after vacuum degassing into the injection pipeline, and close the resin stop valve of the degassing device after all the resin flows into the injection pipeline; S300. Open the gas pressure stop valve and the injection port stop valve to start resin injection; S400. Control the pressure electro-hydraulic proportional valve through the industrial control computer and the programmable logic controller, introduce high-pressure gas with a specified pressure P1 to apply injection pressure to the resin in the injection pipeline. At this time, collect the resin pressure P2 of the melt pressure sensor, use the pressure value P1 of the high-pressure gas driven by the pressure electro-hydraulic proportional valve as the input of the PID controller in the programmable logic controller, use the resin pressure P2 measured by the melt pressure sensor as the output of the PID controller in the programmable logic controller, adjust the high-pressure gas pressure P1 through the pressure electro-hydraulic proportional valve, and further control the resin pressure P2 measured by the melt pressure sensor to be equal to the injection process pressure Pt set in the industrial control computer at the t moment after the start of the injection process; S500. When the industrial camera monitors that the gas-liquid interface of the resin reaches the specified position, close the injection port stop valve; S600. Close the pressure pipeline stop valve, the injection port stop valve, the glue outlet stop valve, the glue outlet pipeline stop valve, and the vacuum stop valve, and take out the melt pressure sensor and the resin collection barrel; S700. Raise the air temperature of the oven to raise the forming mold to the curing temperature and complete the entire resin curing process, and at the same time cure the residual resin in the injection pipeline; S800. Cool down the oven, wait for the forming mold to cool down and then demold, remove the injection pipeline, and complete the preparation of the composite material part.

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