A method for pre-embedding foam in the manufacturing process of composite materials products

Abstract

This invention discloses a foam pre-embedding method in the manufacturing process of composite material products, including the following steps: S1, preparing a mold; S2, cutting prepreg; S3, laying; S4, processing the foam; S5, preparing cellophane; S6, inserting the foam; S7, secondary laying; S8, mold fitting; S9, hot pressing. This invention relates to the field of composite material molding technology. The beneficial effects of this invention are: 1. By laying cellophane between PMI foam and carbon fiber undercoat, after placing the PMI foam wrapped with the adhesive film layer on top of the carbon fiber undercoat, the adhesive film can be quickly pre-embedded in the corresponding position, thereby reducing the deformation of the foam caused by compression during the pre-embedding operation. In the process, the adhesive film does not directly contact the prepreg during the embedding process, reducing product quality problems caused by adhesive film damage.

Description

Technical Field

[0001] This invention relates to the field of composite material molding technology, and in particular to a method for pre-embedding foam in the manufacturing process of composite material products. Background Technology

[0002] Carbon fiber composites are inorganic high-performance fibers with a carbon content of over 90%, which are transformed from organic fibers through a series of heat treatments. They are a new material with excellent mechanical properties, possessing the inherent characteristics of carbon materials, while also having the softness and processability of textile fibers. They are a new generation of reinforcing fibers.

[0003] In the production of carbon fiber foam composite products, the foam is usually completely wrapped with an adhesive film and then manually pressed into the designated position inside the carbon fiber undercoat. However, due to the high viscosity of the adhesive film, it is difficult to directly place the foam in the corresponding position. Furthermore, during the pre-embedding process, the adhesive film often adheres to the prepreg and cannot be moved. Forcibly moving the foam may cause the adhesive film to tear or the foam to collapse, directly affecting product quality.

[0004] After the pre-embedding is completed, a hot press is needed to perform hot pressing and curing operations on the carbon fiber foam composite material products. However, when the existing hot press is used to hot press carbon fiber foam composite material products of different specifications and shapes, the mold needs to be replaced. However, in the existing technology, the mold is mostly installed and fixed with multiple bolts, and the overall operation process is cumbersome. In view of this, in-depth research was conducted on the above problems, which led to this case. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems by designing a foam pre-embedding method in the manufacturing process of composite material products, which solves the existing background technology problems.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a composite material with pre-embedded foam, comprising a carbon fiber lower skin, wherein the carbon fiber lower skin is generally shaped like a bowl, the upper side of the carbon fiber lower skin is filled with PMI foam, the outer layer of the PMI foam is wrapped with an adhesive film layer, the shape of the PMI foam matches the shape of the carbon fiber lower skin, and an upper carbon fiber skin is connected to the upper side of the carbon fiber lower skin.

[0007] This technical solution also discloses a foam pre-embedding method in the manufacturing process of composite material products, including the following steps: S1, preparing a mold; S2, cutting prepreg; S3, laying; S4, processing foam; S5, preparing cellophane; S6, inserting foam; S7, secondary laying; S8, mold fitting; S9, hot pressing.

[0008] S1: Prepare composite material molding molds and carry out preparatory work before laying;

[0009] S2: Cut the prepreg according to the usage requirements;

[0010] S3: Evenly lay the carbon fiber lower skin onto the lower mold of the composite material molding mold;

[0011] S4: Wrap the entire PM I foam with adhesive film;

[0012] S5: Cut the cellophane and lay cellophane of the same size evenly on the top of the carbon fiber undercoat along the center line of the mold width direction in an overlapping manner;

[0013] S6: Press the PMI foam tightly against the inner wall of the front end of the carbon fiber lower skin, and slowly press the foam into the mold;

[0014] S7: Apply carbon fiber skin over PM I foam;

[0015] S8: Connect the upper mold and the lower mold of the composite material molding die;

[0016] S9: Control the operation of the hot press to clamp the upper and lower molds of the composite material molding die together, and perform hot pressing molding operation on the carbon fiber composite material with foam pre-embedded.

[0017] Preferably, in step S5, the overlap width between the two pieces of cellophane is not less than 100mm.

[0018] This technical solution also discloses a foam pre-embedding device applied in the manufacturing process of composite material products, including a base, a hydraulic push rod installed on the top of the base, four guide rods provided at the four corners of the top of the base, a lifting seat connected to the top of the output end of the hydraulic push rod, the lifting seat being slidably connected to the four guide rods on both sides, a lower mold provided on the top of the lifting seat, clamping structures provided on both sides of the lifting seat, the lower mold being connected to the clamping structures, a top mold structure installed on the top of the four guide rods, and a tensioning structure provided on the front and rear sides of the lifting seat;

[0019] The clamping structure includes: a driving component, two bidirectional screws, two synchronous pulleys, a synchronous belt, two first movable frames, four strip-shaped through holes, four movable blocks, two second movable frames, two connecting blocks, and four clamping assemblies;

[0020] The drive component is installed at the bottom of the lifting base. Two bidirectional screws are disposed at the bottom of the lifting base and connected to the bottom of the lifting base via bearing seats. Two synchronous pulleys are respectively connected to one end of the two bidirectional screws. The two first movable frames are threadedly connected to the two bidirectional screws on both sides. Four strip-shaped through holes are opened on the lower side of the lifting base. The tops of four movable blocks pass through the four strip-shaped through holes and are connected to the bottoms of the two second movable frames. The two second movable frames are located on the upper side of the lifting base. Two connecting blocks are installed inside the two second movable frames. Four clamping assemblies are respectively connected to the two connecting blocks on both sides.

[0021] Preferably, one of the four clamping assemblies includes: a clamping block, a plug-in block, and a connecting spring;

[0022] The connecting block has insertion holes on both sides. One end of the connecting spring is connected to the inside of the insertion hole, and the other end is connected to one end of the plug-in block. One end of the plug-in block is inserted into the insertion hole, and the clamp is connected to the other end of the plug-in block.

[0023] Preferably, one of the two tensioning structures includes: a rotating frame, a first electric push rod, a limiting frame, a second electric push rod, and a clamping block;

[0024] The bottom of the rotating frame is rotatably connected to the top of the lifting seat, the driving end of the first electric push rod is rotatably connected to the top of the lifting seat, the output end of the electric push rod is rotatably connected to the rear side of the rotating frame, the limiting frame is installed on the top of the rotating frame, the driving end of the second electric push rod is installed on the top of the limiting frame, and the output end of the second electric push rod passes through the top of the limiting frame and connects to the top of the clamping block.

[0025] Preferably, the top mold structure includes: a fixing block, two limiting slides, an upper mold, and two fixing bolts;

[0026] The fixing block is connected to the top of the four guide rods, the two limiting slides are set at the bottom of the fixing block, the two sides of the upper mold are slidably connected to the two limiting slides, and the two fixing bolts are threadedly connected to the two limiting slides.

[0027] Preferably, a support block is provided on the lower side of the four guide rods, and the width of the support block is greater than the width of the guide rod passing through the lifting seat.

[0028] Preferably, one end of the clamping block is slidably connected to the inner side of the second movable frame, and the other end of the clamping block is wedge-shaped.

[0029] Preferably, a return spring is provided on the top of the lifting seat, with one end of the return spring connected to the top of the lifting seat and the other end connected to the lower side of the rotating frame.

[0030] The foam pre-embedding method in the manufacturing process of composite material products using the technical solution of the present invention has the following advantages: 1. In this technical solution, by laying cellophane between PMI foam and carbon fiber lower skin, after placing PMI foam wrapped with adhesive film layer on top of carbon fiber lower skin, the adhesive film can be quickly pre-embedded in the corresponding position, thereby reducing the deformation of foam caused by compression during the pre-embedding operation. In the process, the adhesive film does not directly contact the prepreg during the embedding process, reducing the quality problems of the product caused by adhesive film damage.

[0031] 2. At the same time, this technical solution provides foam pre-embedding equipment for use in the manufacturing process of composite material products. During operation, the operator can replace the hot pressing mold according to the usage requirements. Then, the replaced mold can be quickly fixed by the cooperation of drive components and other parts. The overall operation process is simple, which improves production efficiency and reduces the labor intensity of workers. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the front view structure of a foam-embedded composite material according to the present invention.

[0033] Figure 2 This is a schematic diagram showing the disassembled structure of a foam-embedded composite material according to the present invention.

[0034] Figure 3 This is a front view structural diagram of a foam pre-embedding device applied in the manufacturing process of composite material products according to the present invention.

[0035] Figure 4 This is a top view of the lifting seat structure of a foam pre-embedded device used in the manufacturing process of composite material products according to the present invention.

[0036] Figure 5 This is a bottom view of the lifting seat structure of a foam pre-embedded equipment used in the manufacturing process of composite material products according to the present invention.

[0037] Figure 6 This is a side view of the tension structure of a foam pre-embedded device used in the manufacturing process of composite material products according to the present invention.

[0038] Figure 7 This is a cross-sectional structural diagram of a foam pre-embedding device used in the manufacturing process of composite material products according to the present invention.

[0039] In the diagram: 1. Carbon fiber lower skin, 2. PMI foam, 3. Adhesive film layer, 4. Carbon fiber upper skin, 5. Base, 6. Hydraulic push rod, 7. Guide rod, 8. Lifting seat, 9. Lower mold, 10. Drive component, 11. Bidirectional screw, 12. Synchronous pulley, 13. Synchronous belt, 14. First moving frame, 15. Strip-shaped through hole, 16. Moving block, 17. Second moving frame, 18. Connecting block, 19. Clamping block, 20. Insertion block, 21. Connecting spring, 22. Rotating frame, 23. First electric push rod, 24. Limiting frame, 25. Second electric push rod, 26. Clamping block, 27. Fixing block, 28. Limiting slide, 29. Upper mold, 30. Fixing bolt, 31. Support block, 32. Return spring. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1-7 .

[0041] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires, and should select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, without explaining the electrical control.

[0042] Example: A foam-embedded composite material includes a carbon fiber lower skin 1, which is bowl-shaped. PMI foam 2 is filled on the upper side of the carbon fiber lower skin, and an adhesive film layer 3 is wrapped around the outer layer of the PMI foam 2. The shape of the PMI foam 2 matches the shape of the carbon fiber lower skin 1, and a carbon fiber upper skin 4 is connected to the upper side of the carbon fiber lower skin 1.

[0043] It should be noted that during the preparation process, the PMI foam 2 is wrapped with an adhesive film layer 3, and two layers of cellophane are laid on top of the carbon fiber lower skin 1 by overlapping. Then, the PMI foam 2 wrapped with the adhesive film layer 3 can be placed on top of the carbon fiber lower skin 1, and the position of the PMI foam 2 can be adjusted according to the usage requirements. Since the two cellophane sheets connect the PMI foam 2 and the carbon fiber lower skin 1, the operator can move the position of the PMI foam 2. After the adjustment is completed, the two cellophane sheets are removed, and the carbon fiber upper skin 4 is laid on top of the PMI foam 2. Then, a hot press can be used to perform hot pressing and curing operations to finally complete the preparation of the carbon fiber foam composite material product.

[0044] This technical solution also discloses a foam pre-embedding method in the manufacturing process of composite material products, including the following steps: S1, preparing a mold; S2, cutting prepreg; S3, laying; S4, processing foam; S5, preparing cellophane; S6, inserting foam; S7, secondary laying; S8, mold fitting; S9, hot pressing.

[0045] S1: Prepare composite material molding molds and carry out preparatory work before laying;

[0046] S2: Cut the prepreg according to the usage requirements;

[0047] S3: Evenly lay the carbon fiber lower skin 1 onto the lower mold 9 of the composite material molding mold;

[0048] S4: Wrap the PMI foam 2 completely with adhesive film;

[0049] S5: Cut the cellophane and lay cellophane of the same size evenly on the top of the carbon fiber lower skin 1 in an overlapping manner along the center line of the mold width direction;

[0050] S6: Press the PMI foam 2 tightly against the inner wall of the front end of the carbon fiber lower skin 1, and slowly press the foam into the mold;

[0051] S7: Lay carbon fiber skin 4 on top of PMI foam 2;

[0052] S8: Connect the upper mold 29 and the lower mold 9 of the composite material molding die;

[0053] S9: Control the operation of the hot press to clamp the upper mold 29 and the lower mold 9 of the composite material molding die together, and perform hot pressing molding operation on the carbon fiber composite material with foam pre-embedded.

[0054] This technical solution also discloses a foam pre-embedding device applied in the manufacturing process of composite material products, including a base 5, a hydraulic push rod 6 installed on the top of the base, four guide rods 7 set at the four corners of the top of the base 5, a lifting seat 8 connected to the top of the output end of the hydraulic push rod 6, the lifting seat 8 being slidably connected to the four guide rods 7 on both sides, a lower mold 9 set on the top of the lifting seat 8, clamping structures set on both sides of the lifting seat 8, the lower mold 9 being connected to the clamping structures, a top mold structure installed on the top of the four guide rods 7, and a tensioning structure set on the front and rear sides of the lifting seat 8;

[0055] The clamping structure includes: a drive component 10, two bidirectional screws 11, two synchronous pulleys 12, a synchronous belt 13, two first moving frames 14, four strip-shaped through holes 15, four moving blocks 16, two second moving frames 17, two connecting blocks 18, and four clamping assemblies.

[0056] The drive unit 10 is installed at the bottom of the lifting base 8. Two bidirectional screws 11 are set at the bottom of the lifting base 8. The two bidirectional screws 11 are connected to the bottom of the lifting base 8 through bearing seats. Two synchronous pulleys 12 are respectively connected to one end of the two bidirectional screws 11. The two first moving frames 14 are threadedly connected to the two bidirectional screws 11 on both sides. Four strip-shaped through holes 15 are opened on the lower side of the lifting base 8. The top of the four moving blocks 16 passes through the four strip-shaped through holes 15 and is connected to the bottom of the two second moving frames 17. The two second moving frames 17 are located on the upper side of the lifting base 8. Two connecting blocks 18 are installed inside the two second moving frames 17. Four clamping components are respectively connected to the two sides of the two connecting blocks 18.

[0057] Four clamping components, one of which includes: a clamping block 19, a plug-in block 20, and a connecting spring 21;

[0058] The connecting block 18 has insertion holes on both sides. One end of the connecting spring 21 is connected to the inside of the insertion hole, and the other end is connected to one end of the plug-in block 20. One end of the plug-in block 20 is plugged into the insertion hole, and the clamp is connected to the other end of the plug-in block 20.

[0059] It should be noted that during use, the operator can replace the lower mold 9 according to the usage requirements. After replacement, the lower mold 9 can be placed on top of the lifting seat 8, and then the drive component 10 can be controlled to run. The drive component 10 can drive the two bidirectional screws 11 to rotate through the cooperation of two synchronous pulleys 12 and synchronous belt 13, thereby driving the two first moving frames 14 to move closer to each other. The two first moving frames 14 have hollowed-out sides, and the lower sides of the four moving blocks 16 are located inside the hollowed-out sides of the two first moving frames 14. Thus, when the two first moving frames 14 move, they can move along the four strip-shaped through holes. 15 drives four moving blocks 16 to move, which in turn drives two second moving frames 17 to move closer. This allows the connecting blocks 18 on the inner side of the two second moving frames 17 to clamp the two sides of the lower mold 9. During the movement of the two second moving frames 17, the two sides of the lower mold 9 will open the two clamping blocks 19 on both sides of the connecting blocks 18, and stretch the connecting spring 21 through the plug-in block 20. Then the inner side of the clamping block 19 will be close to the front and rear side walls of the lower mold 9. With the help of the connecting spring 21, the front and rear sides of the lower mold 9 can be clamped and fixed, thereby completing the quick replacement and fixation of the lower mold 9.

[0060] It is important to note that the clamping block 19 is designed as a wedge shape, and one end of the clamping block 19 has a chamfer. When the driving component 10 moves the two second moving frames 17 closer to the lower mold 9, the outer corner of the lower mold 9 will contact one end of the clamping block 19. As the second moving frames 17 move, they will slowly lift the clamping block 19, so that the connecting block 18 can be tightly attached to one side of the lower mold 9. During this process, the clamping block 19 can complete the clamping and fixing operation of the lower mold 9 in the front and rear directions.

[0061] Two tensioning structures, one of which includes: a rotating frame 22, a first electric push rod 23, a limiting frame 24, a second electric push rod 25, and a clamping block 26;

[0062] The bottom of the rotating frame 22 is rotatably connected to the top of the lifting seat 8. The driving end of the first electric push rod 23 is rotatably connected to the top of the lifting seat 8. The output end of the electric push rod is rotatably connected to the rear side of the rotating frame 22. The limiting frame 24 is installed on the top of the rotating frame 22. The driving end of the second electric push rod 25 is installed on the top of the limiting frame 24. The output end of the second electric push rod 25 passes through the top of the limiting frame 24 and is connected to the top of the clamping block 26.

[0063] The top mold structure includes: a fixing block 27, two limiting slides 28, an upper mold 29, and two fixing bolts 30;

[0064] The fixed block 27 is connected to the top of the four guide rods 7, the two limiting slides 28 are set at the bottom of the fixed block 27, the upper mold 29 is slidably connected to the two limiting slides 28 on both sides, and the two fixing bolts 30 are threadedly connected to the two limiting slides 28.

[0065] It should be noted that the upper mold 29 is inserted into two limit slides 28 on both sides. After insertion, the upper mold 29 is installed and fixed to the bottom of the fixing block 27 by two fixing bolts 30. Since the upper mold 29 is hoisted to the top of the fixing block 27, the upper mold 29 is installed and fixed in a simple and stable way to prevent the upper mold 29 from shaking and becoming unstable.

[0066] It is important to note that support blocks 31 are provided on the lower side of the four guide rods 7. After the lifting seat 8 is reset, the support blocks 31 can provide stable support for the lifting seat 8. After the upper mold 29 and the lower mold 9 are installed and fixed, two layers of cellophane are laid on top of the carbon fiber lower skin 1 by overlapping. At this time, the other ends of the two cellophane sheets are placed inside the limiting frame 24. Then, the second electric push rod 25 is controlled to run, and the clamping block 26 can clamp the other end of the cellophane sheet. After the position of the PMI foam 2 is adjusted, the PMI foam 2 is pressed down and the first... The operation of the electric push rod 23 can pull out the cellophane at a uniform speed and quickly, avoiding the uneven force on the cellophane when manually pulling out the cellophane, which can easily cause the position of PMI foam 2 to shift. At the same time, the return spring 32 is used to quickly drive the rotating frame 22 to return to its original position. Then, the carbon fiber upper skin 4 is laid on the upper side of PMI foam 2, and the hydraulic push rod 6 is controlled to drive the lifting seat 8 and the lower mold 9 after installation and fixation to rise. With the help of the upper mold 29 after installation and fixation, the carbon fiber foam composite material product can be hot-pressed and cured, and the carbon fiber foam composite material product is finally prepared.

[0067] In this technical solution, during the assembly of carbon fiber foam composite materials, by placing two sheets of cellophane between PMI foam 2 and carbon fiber lower skin 1, the position of PMI foam 2 can be adjusted again after it is placed inside carbon fiber lower skin 1. This improves the accuracy of the pre-embedded position of PMI foam 2 and prevents damage to PMI foam 2 during adjustment, thereby increasing the manufacturing speed and product quality of carbon fiber foam composite materials. At the same time, in the hot press section, the upper mold 29 and lower mold 9 can be quickly replaced according to usage requirements, which can further increase the manufacturing speed and product quality of carbon fiber foam composite materials.

[0068] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A foam pre-embedding device applied in the manufacturing process of composite material products, comprising a base (5), a hydraulic push rod (6) installed on the top of the base, four guide rods (7) provided at the four corners of the top of the base (5), a lifting seat (8) connected to the top of the output end of the hydraulic push rod (6), the lifting seat (8) being slidably connected to the four guide rods (7) on both sides, and a lower mold (9) provided on the top of the lifting seat (8), characterized in that, The lifting seat (8) is provided with clamping structures on both sides, the lower mold (9) is connected to the clamping structures, the top of the four guide rods (7) is provided with a top mold structure, and the lifting seat (8) is provided with a pulling structure on both the front and rear sides. The clamping structure includes: a drive unit (10), two bidirectional screws (11), two synchronous pulleys (12), a synchronous belt (13), two first moving frames (14), four strip-shaped through holes (15), four moving blocks (16), two second moving frames (17), two connecting blocks (18), and four clamping components. The driving component (10) is installed at the bottom of the lifting seat (8), the two bidirectional screws (11) are set at the bottom of the lifting seat (8), the two bidirectional screws (11) are connected to the bottom of the lifting seat (8) through bearing seats, the two synchronous pulleys (12) are respectively connected to one end of the two bidirectional screws (11), the two first moving frames (14) are threadedly connected to the two bidirectional screws (11) on both sides, the four strip-shaped through holes (15) are opened on the lower side of the lifting seat (8), the top of the four moving blocks (16) passes through the four strip-shaped through holes (15) and is connected to the bottom of the two second moving frames (17), the two second moving frames (17) are located on the upper side of the lifting seat (8), the two connecting blocks (18) are installed inside the two second moving frames (17), and the four clamping components are respectively connected to the two connecting blocks (18) on both sides. The four clamping assemblies, one of which includes: a clamping block (19), a plug-in block (20), and a connecting spring (21); The connecting block (18) has insertion holes on both sides. One end of the connecting spring (21) is connected to the inside of the insertion hole, and the other end is connected to one end of the plug-in block (20). One end of the plug-in block (20) is inserted into the insertion hole, and the clamp is connected to the other end of the plug-in block (20). The two aforementioned tensioning structures, one of which includes: a rotating frame (22), a first electric push rod (23), a limiting frame (24), a second electric push rod (25), and a clamping block (26); The bottom of the rotating frame (22) is rotatably connected to the top of the lifting seat (8), the driving end of the first electric push rod (23) is rotatably connected to the top of the lifting seat (8), the output end of the first electric push rod is rotatably connected to the rear side of the rotating frame (22), the limiting frame (24) is installed on the top of the rotating frame (22), the driving end of the second electric push rod (25) is installed on the top of the limiting frame (24), and the output end of the second electric push rod (25) passes through the top of the limiting frame (24) and is connected to the top of the clamping block (26).

2. The foam pre-embedding device applied in the manufacturing process of composite material products according to claim 1, characterized in that, The top mold structure includes: a fixing block (27), two limiting slides (28), an upper mold (29), and two fixing bolts (30); The fixing block (27) is connected to the top of the four guide rods (7), the two limiting slides (28) are set at the bottom of the fixing block (27), the upper mold (29) is slidably connected to the two limiting slides (28) on both sides, and the two fixing bolts (30) are threadedly connected to the two limiting slides (28).

3. The foam pre-embedding device applied in the manufacturing process of composite material products according to claim 1, characterized in that, A support block (31) is provided on the lower side of the four guide rods (7), and the width of the support block (31) is greater than the width of the guide rod (7) at the point where it passes through the lifting seat (8).

4. The foam pre-embedding device applied in the manufacturing process of composite material products according to claim 1, characterized in that, One end of the clamping block (19) is slidably connected to the inner side of the second moving frame (17), and the other end of the clamping block (19) is wedge-shaped.

5. A foam pre-embedding device applied in the manufacturing process of composite material products according to claim 1, characterized in that, A return spring (32) is provided on the top of the lifting seat (8). One end of the return spring (32) is connected to the top of the lifting seat (8), and the other end is connected to the lower side of the rotating frame (22).

6. A method for pre-embedding foam in the manufacturing process of a composite material product using the equipment described in any one of claims 1-5, characterized in that, The process includes the following steps: S1, prepare the mold; S2, cut the prepreg; S3, lay the prepreg; S4, treat the foam; S5, prepare the cellophane; S6, insert the foam; S7, lay the prepreg again; S8, fit the mold; S9, heat press. S1: Prepare composite material molding molds and carry out preparatory work before laying; S2: Cut the prepreg according to the usage requirements; S3: The carbon fiber lower skin (1) is evenly laid on the lower mold (9) of the composite material molding mold; S4: Wrap the PMI foam (2) completely with adhesive film; S5: Cut the cellophane and lay cellophane of the same size evenly on the top of the carbon fiber undercoat (1) along the center line of the mold width direction in an overlapping manner; S6: The position of PMI foam 2 can be adjusted according to the usage requirements. After the adjustment is completed, the two cellophane sheets are pulled out, and the PMI foam (2) is pressed tightly against the inner wall of the front end of the carbon fiber lower skin (1). The foam is then slowly pressed into the mold. S7: Lay carbon fiber top skin (4) on top of PMI foam (2); S8: Connect the upper mold (29) and the lower mold (9) of the composite material molding die; S9: Control the operation of the hot press to clamp the upper mold (29) and lower mold (9) of the composite material molding die together, and perform hot pressing molding operation on the carbon fiber composite material with foam pre-embedded.

7. The foam pre-embedding method in the manufacturing process of composite material products according to claim 6, characterized in that, In step S5, the overlap width between the two pieces of cellophane is not less than 100mm.

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