Device and method for monitoring wrinkle forming mechanism in compression molding process

Abstract

The invention discloses a monitoring device and method for a wrinkle forming mechanism in the compression molding process, the monitoring device comprises a mold assembly, a propelling assembly, a heating assembly and a CT scanning assembly, the mold assembly comprises a female mold and a male mold which are matched with each other, and a forming gap used for clamping a prepreg lamination is formed between the female mold and the male mold; the propelling assembly is used for driving the female die and the male die to get close to and away from each other; the heating assembly is used for heating the female die and the male die; and the CT scanning assembly is used for scanning prepreg laminations of the female die and the male die. The pushing assembly is used for controlling the female die and the male die to conduct controllable step-by-step attachment and disassembly of the compression molding process, CT scanning is conducted on a pressed and deformed prepreg lamination layer at all nodes in the compression molding process, a series of 3D model diagrams are obtained, the positions of all wrinkles in the 3D model diagrams are marked, continuous tracking and observation of all the wrinkles are achieved, and the continuous tracking and observation of all the wrinkles are achieved. Therefore, the specific mechanism of wrinkle formation and development is helped to be researched.

Description

Technical Field

[0001] The present invention relates to the technical field of non-destructive monitoring for the preparation of composite materials, and particularly to a monitoring device and method for the formation mechanism of wrinkles during the compression molding process. Background Art

[0002] Due to advantages such as high efficiency, high precision, and high performance, the compression molding process of composite prepregs has been widely used in fields such as aerospace, automotive, shipbuilding, and wind power. However, the molding of composite prepregs is a complex coupling process involving multiple scales and multiple physical fields. During the molding process, defects such as wrinkles are likely to appear between the prepreg layers. Currently, in the industry, the reasons for the generation of wrinkles during the compression molding process of composite prepregs are divided into material factors (such as resin viscosity, fiber type, ply layup method), process factors (such as molding temperature, pressure, pressure application timing, mold structure), and interface factors (such as interfacial adhesion between prepreg layers, mold surface roughness). Specifically, it is manifested that the physical and chemical properties of materials are different under different process conditions, resulting in different interface situations, including but not limited to the effects of different temperatures, pressures, and molding rates on resin viscosity changes and fiber deformation.

[0003] The generation of wrinkles during the compression molding process of composite prepregs will seriously affect the mechanical properties and appearance quality of the parts. Therefore, studying the formation mechanism of wrinkles and developing effective monitoring methods are of great significance for improving the quality of composite parts and process stability. Currently, the monitoring of the reasons for the formation of wrinkles during the compression molding process of prepregs is mainly achieved through dry yarn simulation or by conducting experiments with multiple groups of prepreg compression gaps controlled. Neither of these two methods can continuously track a single individual during the molding process, and the monitoring of wrinkles lacks continuity.

[0004] The limitations of the monitoring methods have led to the fact that currently, neither the industry nor the academic community is clear about the specific mechanism of how various factors such as process and materials affect the formation and development of wrinkles during the molding process. By studying the formation mechanism of wrinkles during the compression molding process of prepregs, the quality and production efficiency of composite structural parts can be greatly improved to meet the growing market demand for composite components. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a monitoring device and method for the formation mechanism of wrinkles during the compression molding process.

[0006] According to the monitoring device for the formation mechanism of wrinkles during the compression molding process of the first aspect of the embodiments of the present invention, it includes: A mold assembly, including a female mold and a male mold that match each other, and a molding gap for clamping a prepreg stack is provided between the female mold and the male mold; A propulsion assembly for driving the female mold and the male mold to approach and separate from each other; A heating component for heating the female mold and the male mold; A CT scanning component for scanning the prepreg stack of the female mold and the male mold.

[0007] The monitoring device for the formation mechanism of wrinkles during the molding process according to the embodiments of the present invention has at least the following beneficial effects: In the present invention, the female mold and the male mold are controllably and gradually pressed together by the propulsion component, so as to disassemble the molding process of the prepreg stack. During the molding process, the prepreg stack not under pressure, the prepreg stack when the female mold and the male mold approach each distance node, the prepreg stack when the female mold and the male mold are completely fitted, and the prepreg stack after curing and molding are respectively scanned by CT to obtain a series of continuous 3D model diagrams of the prepreg stack. Each wrinkle on the model diagram is marked and numbered to realize continuous tracking of each wrinkle. Since the monitoring of the generation and development process of wrinkles is continuous, it is beneficial to study and observe the mechanism of wrinkle generation during the prepreg molding process.

[0008] According to some embodiments of the present invention, the propulsion component includes a pressing mechanism and a frame. The frame includes a top frame, a moving frame, a bottom frame and a plurality of support columns. The plurality of support columns are connected between the top frame and the bottom frame. The moving frame is provided with a plurality of through holes slidably matched with the support columns. The pressing mechanism drives the moving frame to move along the support columns. The female mold is installed on the moving frame or the bottom frame, and the male mold is installed on the bottom frame or the moving frame.

[0009] According to some embodiments of the present invention, the top frame is provided with a threaded hole, and the pressing mechanism includes a screw rod. The screw rod passes through the threaded hole and is connected to the moving frame. According to some embodiments of the present invention, the pressing mechanism further includes a handle, and the handle is connected to the top end of the screw rod.

[0010] According to some embodiments of the present invention, the female mold is detachably connected to the moving frame or the bottom frame, and the male mold is detachably connected to the bottom frame or the moving frame.

[0011] According to some embodiments of the present invention, the CT scanning component includes a ray emission source and a detector. The ray emission source and the detector are respectively arranged on both sides of the frame and are oppositely arranged. The rays emitted by the ray emission source are received by the detector after passing through the prepreg stack.

[0012] According to some embodiments of the present invention, the CT scanning component further includes a sample stage. The sample stage is movably and adjustably arranged between the ray emission source and the detector, and the sample stage is connected to the frame.

[0013] According to some embodiments of the present invention, a sensor assembly includes a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are disposed in the forming gap.

[0014] According to some embodiments of the present invention, the heating assembly includes a plurality of heating rods, and a plurality of the heating rods are respectively embedded in the interiors of the female mold and the male mold. The arrangement distance between the plurality of heating rods in the female mold and the male mold is the same as the distance between the heating rods and the forming gap.

[0015] A monitoring method for the wrinkle formation mechanism during the compression molding process according to the second aspect of the embodiments of the present invention includes: Preparing a prepreg laminate; Moving the prepreg laminate into the forming gap between the female mold and the male mold; Heating the prepreg laminate, the female mold, and the male mold to a preset temperature and maintaining the temperature for a preset time; Controlling the female mold and the male mold to approach each other until the two surfaces of the prepreg laminate are respectively in contact with the female mold and the male mold, and scanning the prepreg laminate to obtain a first 3D model diagram; Controlling the female mold and the male mold to approach each other according to a preset distance and a preset pressure so that the prepreg laminate deforms, and controlling the female mold and the male mold to approach each other N times until the female mold and the male mold are completely fitted. During each control of the female mold and the male mold approaching each other, scanning the prepreg laminate to obtain N second 3D model diagrams; Taking out the prepreg laminate after curing and demolding, and scanning the prepreg laminate to obtain a third 3D model diagram; Marking the positions of each wrinkle in the first 3D model diagram, the N second 3D model diagrams, and the third 3D model diagram, so as to continuously observe the generation and change of wrinkles during the compression molding process.

[0016] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further describes the present invention with reference to the drawings and embodiments, where: Figure 1 is a schematic structural diagram of an embodiment of a monitoring device for the wrinkle formation mechanism during the compression molding process provided by the present invention; Figure 2 is a flowchart of an embodiment of a monitoring method for the wrinkle formation mechanism during the compression molding process provided by the present invention; Reference numerals in the drawings: Mold assembly 100; female mold 101; male mold 102; forming gap 103; Advancing assembly 200; pressing mechanism 210; screw 211; handle 212; frame 220; top frame 221; moving frame 222; bottom frame 223; support column 224; Heating assembly 300; heating rod 301; CT scanning assembly 400; radiation source 401; sample stage 402; detector 403; Sensor assembly 500; temperature sensor 501; pressure sensor 502; Prepreg laminate 600. Detailed implementation manners

[0018] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up and down, 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 thus should not be construed as a limitation to the present invention.

[0020] In the description of the present invention, "a plurality of" means more than two. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0022] The technical solutions of the present invention will be described clearly and completely below with reference to the drawings. Obviously, the following described embodiments are some embodiments of the present invention, not all embodiments.

[0023] Due to its advantages such as high efficiency, high precision, and high performance, the compression molding process of composite prepregs has been widely used in the fields of aerospace, automotive, shipbuilding, wind power, etc. However, the forming of composite prepregs is a complex coupling process involving multiple scales and multiple physical fields. During the forming process, defects such as wrinkles are likely to appear between prepreg layers. Currently, the reasons for the formation of wrinkles during the compression molding process of composite prepregs in the industry are divided into material factors (such as resin viscosity, fiber type, layup method), process factors (such as compression temperature, pressure, pressurization timing, mold structure), and interface factors (such as interfacial adhesion between prepreg layers, mold surface roughness). Specifically, it is manifested that the physical and chemical properties of the material are different under different process conditions, resulting in different interface situations, including but not limited to the influence of different temperatures, pressures, and forming rates on the resin viscosity change and fiber deformation.

[0024] The formation of wrinkles during the compression molding process of composite prepregs will seriously affect the mechanical properties and appearance quality of the parts. Therefore, studying the formation mechanism of wrinkles and developing effective monitoring methods are of great significance for improving the quality and process stability of composite parts. Currently, the monitoring of the reasons for the formation of wrinkles during the compression molding process of prepregs is mainly achieved through dry yarn simulation or by conducting multiple groups of prepreg compression gap control experiments. Neither of these two methods can continuously track a single individual during the forming process, and the monitoring of wrinkles lacks continuity.

[0025] The limitations of the monitoring methods have led to the fact that the industry and academia are not clear about the specific mechanism of how various factors such as process and materials affect the formation and development of wrinkles during the forming process. By studying the formation mechanism of wrinkles during the compression molding process of prepregs, the quality and production efficiency of composite structural parts can be greatly improved to meet the growing market demand for composite components.

[0026] To solve the above problems, the present invention provides a monitoring device and method for the formation mechanism of wrinkles during the compression molding process to continuously observe the generation and development of wrinkles on the prepreg stack 600 during the compression molding process.

[0027] Reference Figure 1 As shown in the figure, the following embodiments are made for a monitoring device for the formation mechanism of wrinkles during the compression molding process of the present invention: The monitoring device of this embodiment includes: a mold assembly 100, a propulsion assembly 200, a heating assembly 300, and a CT scanning assembly 400.

[0028] Among them, the mold assembly 100 includes a female mold 101 and a male mold 102 that match each other. A forming gap 103 for clamping the prepreg stack 600 is provided between the female mold 101 and the male mold 102. In this embodiment, the female mold 101 and the male mold 102 are arranged vertically opposite to each other. In some other embodiments, the female mold 101 and the male mold 102 can be arranged in other directions, such as horizontally opposite to each other.

[0029] The propulsion assembly 200 is used to drive the female mold 101 and the male mold 102 to approach and separate from each other, so as to disassemble the molding process and make the molding process controllable. Specifically, the propulsion assembly 200 includes a pressing mechanism 210 and a frame 220. The frame 220 includes: a top frame 221, a moving frame 222, a bottom frame 223, and a plurality of support columns 224. The plurality of support columns 224 are connected between the top frame 221 and the bottom frame 223, so that a space for the relative movement of the female mold 101 and the male mold 102 is formed between the top frame 221 and the bottom frame 223. The female mold 101 is installed on the moving frame 222 or the bottom frame 223, and the male mold 102 is installed on the bottom frame 223 or the moving frame 222.

[0030] The moving frame 222 is provided with a plurality of through holes that are slidably matched with the support columns 224. The pressing mechanism 210 drives the moving frame 222 to slide along the support columns 224. The support columns 224 play a guiding role in the movement of the moving frame 222. In this embodiment, the female mold 101 is installed on the moving frame 222, and the male mold 102 is installed on the bottom frame 223. The support columns 224 play a guiding role in the approach and separation of the female mold 101 and the male mold 102, and the support columns 224 limit the relative movement direction of the female mold 101 and the male mold 102 along the extension direction of the support columns 224.

[0031] Specifically, in this embodiment, the top frame 221 is provided with a threaded hole. The pressing mechanism 210 includes a screw rod 211 that matches the threaded hole. The screw rod 211 passes through the threaded hole and is connected to the moving frame 222. By rotating the screw rod 211 in the threaded hole, the whole screw rod 211 moves up and down relative to the top frame 221, thereby driving the moving frame 222 to move up and down relative to the top frame 221, realizing the adjustable relative movement of the female mold 101 and the male mold 102. When adjusted to the preset position, the position of the screw rod 211 can be fixed. Preferably, a scale mark is set on the screw rod 211, so as to facilitate precise control.

[0032] In some other embodiments, the pressing mechanism 210 can be other structures, such as a hydraulic rod, etc., as long as it satisfies controlling the up and down movement of the moving frame 222 and applying a certain pressure to keep the position of the moving frame 222.

[0033] To facilitate the adjustment of the screw rod 211, a handle 212 is connected to one end of the screw rod 211 away from the moving frame 222. By rotating the handle 212, the screw rod 211 is driven to rotate, greatly facilitating the adjustment process for the operator. Preferably, the handle 212, the screw rod 211, and the moving frame 222 are of an integrated structure to ensure the stability and safety during the molding process.

[0034] In order to continuously observe the molding process of molds with different shapes, the female mold 101 is detachably connected to the moving frame 222, and the male mold 102 is detachably connected to the base frame 223. The detachable connection method can adopt vacuum adsorption, card slots, etc., so that the mold shape can be flexibly changed, thereby expanding the applicable range of the monitoring device.

[0035] The CT scanning assembly 400 of this embodiment includes a ray emission source 401 and a detector 403. The ray emission source 401 and the detector 403 are respectively arranged on both sides of the frame 220 and are oppositely arranged. The rays emitted by the ray emission source 401 are received by the detector 403 after passing through the prepreg stack 600. The prepreg stack 600 is rapidly scanned by the CT scanning assembly 400, and the scanning results are post-processed to obtain a 3D model diagram, thereby realizing the visual characterization of the position and shape of the wrinkles without affecting the molding process.

[0036] Furthermore, during the molding process, the central position of the prepreg stack 600 will change. In order to adjust the position of the prepreg stack 600 in the CT scanning field of view, the CT scanning assembly 400 further includes a sample stage 402. The sample stage 402 is movably and adjustably arranged between the ray emission source 401 and the detector 403. In this embodiment, the base frame 223 is connected to the sample stage 402, and fixing bolts are provided around the base frame 223. The frame 220 can be integrally fixed on the sample stage 402 through the fixing bolts, so that the prepreg stack 600 can be maintained at the center of the CT scanning field of view by adjusting the sample stage 402.

[0037] In some other embodiments, the position of the frame 220 can be made movably adjustable by other means, such as a hanging bracket, etc. In some other embodiments, the frame 220 can be integrally fixed on the sample stage 402 by other means, such as card slots, etc.

[0038] The heating component 300 is used to heat the female mold 101 and the male mold 102 and participate in the compression molding process. The heating component 300 of this embodiment includes a plurality of heating rods 301, and the plurality of heating rods 301 are respectively embedded inside the female mold 101 and the male mold 102. In order to ensure the uniform temperature of the female mold 101 and the male mold 102, the distances between the heating rods 301 and the distances between each heating rod 301 and the molding gap 103 are the same. The temperature of the heating rod 301 is adjustable, and it can control the heating of the female mold 101 and the male mold 102 to a preset temperature and keep warm. In some other embodiments, the heating component 300 can be in other forms, such as a heating film, etc.

[0039] Furthermore, the monitoring device of this embodiment further includes a sensor assembly 500. The sensor assembly 500 includes a temperature sensor 501 and a pressure sensor 502. The temperature sensor 501 and the pressure sensor 502 are arranged in the molding gap 103 and are used to monitor the ambient temperature and the pressure received by the prepreg stack 600 in real time during the compression molding process, and then study the influence of different ambient temperatures and pressures on the generation and development of wrinkles in combination with the 3D model diagram.

[0040] Preferably, the heating rod 301 is signal-connected to the temperature sensor 501 to more precisely control the heating temperature. The pressure sensor 502 is a thin-film pressure sensor 502, so as to reduce the influence on the compression molding process. The pressure sensor 502 is placed between the prepreg stack 600 and the male mold 102 and is used to monitor the positive pressure received by the prepreg stack 600 in real time.

[0041] The monitoring method for the formation mechanism of wrinkles during the compression molding process provided by the present invention includes: S100: Prepare the prepreg stack 600; S200: Move the prepreg stack 600 into the molding gap 103 between the female mold 101 and the male mold 102; S300: Heat the prepreg stack 600, the female mold 101 and the male mold 102 to a preset temperature and keep warm for a preset time; S400: Control the female mold 101 and the male mold 102 to approach each other until the two surfaces of the prepreg stack 600 are in contact with the female mold 101 and the male mold 102 respectively, and scan the prepreg stack 600 to obtain a first 3D model diagram; S500: Control the female mold 101 and the male mold 102 to approach each other according to a preset distance and a preset pressure, so that the prepreg stack 600 deforms. Control the female mold 101 and the male mold 102 to approach each other N times until the female mold 101 and the male mold 102 are completely fitted. During each control of the female mold 101 and the male mold 102 to approach each other, scan the prepreg stack 600 to obtain N second 3D model diagrams; S600: Demold and take out the cured prepreg stack 600, and scan the prepreg stack 600 to obtain a third 3D model diagram. S700: Mark the positions of each fold in the first 3D model diagram, N second 3D model diagrams and the third 3D model diagram, so as to continuously observe the generation and change of folds during the molding process.

[0042] Among them, in step S100, lay the single-layer prepreg according to the designed layup to form the prepreg stack 600, vacuum compact the prepreg stack 600, and keep the pressure for about 30 minutes to obtain the prepreg stack 600.

[0043] In step S300, control the temperatures of the prepreg stack 600, the female mold 101 and the male mold 102 to rise to the preset temperature and keep warm for the preset time, and the preset time is about 5 minutes.

[0044] In step S400, control the female mold 101 and the male mold 102 to approach each other until the two surfaces of the prepreg stack 600 are in contact with the female mold 101 and the male mold 102 respectively, and the forming gap 103 is exactly equal to the thickness of the prepreg stack 600, so as to limit and clamp the prepreg stack 600, adjust the position of the prepreg stack 600 to the center position of the CT scanning field of view, and quickly scan the prepreg stack 600 by CT and post-process the scanning results to obtain the first 3D model diagram.

[0045] In step S500, control the female mold 101 and the male mold 102 to approach each other according to the preset distance and preset pressure. The preset distance is determined according to the depth distance between the female mold 101 and the male mold 102 and the designed number of monitoring states. After visually observing a certain deformation of the prepreg stack 600, limit the distance between the female mold 101 and the male mold 102, quickly scan the prepreg stack 600 by CT and post-process the scanning results to obtain the second 3D model diagram. This step is repeated N times until the female mold 101 and the male mold 102 are completely fitted.

[0046] In step S700, based on the 3D model diagram of the composite material component obtained by molding the final prepreg stack 600, find each fold in the composite material component and mark the position of each fold, query the deformation of the fold position in the 3D model when the prepreg stack 600 is in different deformation states, comprehensively compare the changes of the fold position in different molding processes, and establish a full-process model diagram of the generation and development of folds in the prepreg stack 600 for analyzing the mechanism of the generation and development of folds during the composite material molding process.

[0047] The monitoring method for the formation mechanism of wrinkles during the compression molding process provided by the present invention decomposes the compression molding process by the controllable and gradual approach of the female mold 101 and the male mold 102, and realizes real-time visual monitoring of the entire compression molding process through CT scanning, so as to continuously track each wrinkle, which is beneficial to the study of the formation mechanism of wrinkles during the compression molding process of prepreg.

[0048] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0049] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. Monitoring device for the formation mechanism of wrinkles during the compression molding process, characterized in that, Comprising: A mold assembly, including a female mold and a male mold that match each other, and a forming gap for clamping a prepreg laminate is provided between the female mold and the male mold; A propulsion assembly for driving the female mold and the male mold to approach and separate from each other; A heating assembly for heating the female mold and the male mold; A CT scanning assembly for scanning the prepreg laminate of the female mold and the male mold.

2. The monitoring device according to claim 1, wherein It further includes: The propulsion assembly includes a pressing mechanism and a frame. The frame includes a top frame, a moving frame, a bottom frame, and a plurality of support columns. The plurality of support columns are connected between the top frame and the bottom frame. The moving frame is provided with a plurality of through holes that slidably cooperate with the support columns. The pressing mechanism drives the moving frame to move along the support columns. The female mold is installed on the moving frame or the bottom frame, and the male mold is installed on the bottom frame or the moving frame.

3. The monitoring device according to claim 2, wherein: The top frame is provided with a threaded hole, and the pressing mechanism includes a screw rod, and the screw rod passes through the threaded hole and is connected to the moving frame.

4. The monitoring device according to claim 3, wherein: The pressing mechanism further includes a handle, and the handle is connected to the top end of the screw rod.

5. The monitoring device according to claim 2, wherein: The female mold is detachably connected to the moving frame or the bottom frame, and the male mold is detachably connected to the bottom frame or the moving frame.

6. The monitoring device according to claim 1, wherein: The CT scanning assembly includes a radiation source and a detector. The radiation source and the detector are respectively arranged on both sides of the frame and are oppositely arranged. The radiation emitted by the radiation source is received by the detector after passing through the prepreg laminate.

7. The monitoring device according to claim 6, wherein: The CT scanning assembly further includes a sample stage, and the sample stage is movably and adjustably arranged between the radiation source and the detector, and the sample stage is connected to the frame.

8. The monitoring device according to claim 1, characterized in that, It further includes: A sensor assembly, the sensor assembly includes a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are arranged in the forming gap.

9. The monitoring device according to claim 1, wherein: The heating assembly includes a plurality of heating rods, and a plurality of the heating rods are respectively embedded in the interiors of the female mold and the male mold. The arrangement distance between the plurality of heating rods in the female mold and the male mold is the same as the distance between the heating rods and the forming gap.

10. A monitoring method for the mechanism of wrinkle formation during the compression molding process, characterized in that, Applicable to the monitoring device according to claims 1 to 9, the monitoring method includes: Preparing a prepreg laminate; Moving the prepreg laminate into the forming gap between the female mold and the male mold; Heating the prepreg laminate, the female mold, and the male mold to a preset temperature and maintaining the temperature for a preset time; Controlling the female mold and the male mold to approach each other until the two surfaces of the prepreg laminate respectively contact the female mold and the male mold, and scanning the prepreg laminate to obtain a first 3D model diagram; Control the female mold and the male mold to approach each other according to a preset distance and a preset pressure, so that the prepreg laminate is deformed, and control the female mold and the male mold to approach each other N times until the female mold and the male mold are completely fitted. In each control of the female mold and the male mold approaching each other, scan the prepreg laminate to obtain N second 3D model diagrams; After curing and demolding the prepreg laminate, scan the prepreg laminate to obtain a third 3D model diagram; Mark the positions of each fold in the first 3D model diagram, the N second 3D model diagrams and the third 3D model diagram, so as to continuously observe the generation and change of folds during the molding process.

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