Metal embedded part, carbon fiber composite product and processing method

Abstract

The invention discloses a metal embedded part, a carbon fiber composite product and a machining method. The metal embedded part comprises a metal part body and a positioning column, and a positioning hole is formed in the metal part body; the positioning columns and the carbon fiber composite product are made of the same material, the positioning columns are embedded into the positioning holes, and the upper ends of the positioning columns protrude out of the upper surface of the metal part body and extend to the surface of the carbon fiber composite product. Through material matching and structure interlocking design, the metal embedded part effectively solves the problem of displacement of the metal embedded part caused by difference of thermal expansion coefficients in the hot press molding process of the carbon fiber composite material product, and the bonding reliability of metal and a composite material interface is enhanced.

Description

Technical Field

[0001] This invention relates to the field of composite material manufacturing technology, and in particular to a metal embedded part, a carbon fiber composite material product, and a processing method. Background Technology

[0002] With the increasing demands for lightweighting and high performance in the modern automotive industry, carbon fiber reinforced composite materials, with their combined advantages of high specific strength, high specific modulus, and low density, have been widely used in key components such as vehicle body structures, chassis systems, and battery casings. To meet the requirements of vehicle assembly and functional integration, these composite material components often have metal inserts embedded during the layup stage. This leverages the excellent machinability and joining properties of metal materials to ensure assembly accuracy and improve force transmission efficiency. For example, in new energy electric vehicles, using carbon fiber composite materials to replace traditional metals in battery casing manufacturing can significantly reduce weight while maintaining the same strength requirements, thereby effectively improving the vehicle's range. Currently, the mainstream manufacturing process for carbon fiber battery casings involves laying up unidirectional prepreg tape and then hot-pressing and curing it, with metal connectors embedded internally to achieve structural assembly functionality.

[0003] However, the significant differences in the inherent properties of metal and carbon fiber composites pose a severe challenge to their interfacial bonding. Carbon fiber composites, composed of fiber reinforcement and a resin matrix, exhibit heterogeneous and anisotropic characteristics; while metal materials are homogeneous and isotropic. Their poor chemical affinity means that interfacial bonding relies primarily on physical adsorption, resulting in inherently weak bonding strength. During vehicle operation, components are continuously subjected to complex conditions such as vibration, impact, and alternating loads. Weak interfaces struggle to effectively transfer external forces, easily leading to micro-gaps between the metal embedded parts and the composite laminate, which can gradually expand into delamination or peeling damage, seriously threatening structural integrity and vehicle safety.

[0004] Furthermore, to achieve functions such as bolted connections, metal embedded parts often require through-hole machining. During drilling, the significant difference in stiffness and hardness between the metal and the composite material, as well as the brittle characteristics of the resin matrix, cause a drastic stress change when the machining tool penetrates the interface. This phenomenon is particularly pronounced in geometrically discontinuous areas such as the edges of through holes, leading to high stress concentration. This stress can easily exceed the tolerance limit of the composite material interface and the fracture strength of the resin matrix, thus inducing initial microcracks. These microcracks continue to propagate under subsequent machining stress release and service loads, ultimately leading to interface cracking failure.

[0005] Meanwhile, during the hot-pressing curing stage, the significant difference in the coefficients of thermal expansion between the metal and the carbon fiber composite material can easily lead to dimensional mismatches caused by thermal expansion and contraction, resulting in displacement of the embedded metal parts. For example, the connecting lugs between the upper and lower shells of the battery casing may deviate from their designed positions after thermoforming, causing assembly misalignment and affecting connection reliability.

[0006] In summary, the interfacial bonding and structural synergy between metal embedded parts and carbon fiber composite materials in existing technologies urgently need further optimization and breakthroughs. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a metal embedded part, a carbon fiber composite material product and a processing method, which has the advantages of high interface bonding strength and reliable positional accuracy.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A metal embedded part for carbon fiber composite products, comprising: The metal part body has positioning holes. The positioning post is made of the same material as the carbon fiber composite product. The positioning post is embedded in the positioning hole, and the upper end of the positioning post protrudes from the metal body and is suitable for being exposed on the surface of the carbon fiber composite product after molding.

[0009] A further technical solution is that the top of the positioning post has a positioning groove, and an iron core that can be magnetically attracted is embedded in the positioning groove.

[0010] A further technical solution is that the iron core is wrapped with a hot melt wire, the iron core is fixed in the positioning groove by adhesive, and one end of the hot melt wire is exposed in the positioning groove.

[0011] A further technical solution is that the surface of the metal part body is provided with multiple grooves, and the multiple grooves are arranged in a circumferential array with the positioning hole as the center.

[0012] A further technical solution is that the trench adopts one or more of the following shapes: polygonal, wavy, straight, or spiral.

[0013] A further technical solution is that the surface of the metal part body is provided with a cured carbon fiber composite material layer.

[0014] A method for processing carbon fiber composite materials includes the following steps: S1. Lay carbon fiber prepreg tape layer by layer in the mold according to the layup design until the thickness of one layup is reached; S2. Obtain any of the metal embedded parts described above and place them in the set positions; S3. Continue to lay carbon fiber prepreg tape layer by layer on top of the metal embedded parts according to the layup design until the second layup thickness is reached. The sum of the first layup thickness and the second layup thickness is the design thickness of the carbon fiber composite material product. S4. Mold closing and hot pressing for curing; S5. Machining holes on the positioning pins and installing fasteners.

[0015] A further technical solution is that, when the acquired metal embedded part has a positioning groove on the top of the positioning post, and the positioning groove contains an iron core that can be magnetically attracted, the processing method of the carbon fiber composite material product further includes the following steps: S3.5. Permanent magnets that are magnetically attracted to the positioning pillars are set at the corresponding positions of the mold. S4.5, Remove the iron core.

[0016] A further technical solution is that when the iron core of the obtained metal embedded part is fixed in the positioning groove by adhesive, one end of the hot melt wire is exposed in the positioning groove. The method of removing the iron core is to heat the hot melt wire and remove the iron core after the adhesive area is melted.

[0017] A carbon fiber composite material product is obtained by the processing method of carbon fiber composite material products described in any one of the above-mentioned methods.

[0018] The beneficial effects of adopting the above technical solution are as follows: The positioning posts on the metal embedded parts are made of the same resin-based composite material as the carbon fiber composite products. They are cured columnar structures that can be interference-fitted with the metal part body. The upper end of the positioning post extends to the outer surface of the composite product, forming an additional connection between the metal part body and the carbon fiber composite material. This effectively constrains the positional movement of the metal part body during hot pressing. After the product has cured, assembly holes can be further machined on the positioning posts, which provide a direct positioning reference, thus ensuring assembly accuracy.

[0019] The positioning pins effectively ensure the accuracy of the hole positions. Because the shrinkage rates of metal and carbon fiber composites are different during the curing and cooling process, if the final holes are pre-drilled directly on the metal part, the hole positions will be offset relative to the external reference of the composite material after cooling. However, by machining the holes on the positioning pins after curing, it can be ensured that the hole positions are consistent with the reference of the composite material product, effectively avoiding errors caused by thermal deformation.

[0020] Furthermore, since the positioning post is made of the same material as the carbon fiber composite product, stress concentration caused by abrupt changes in material stiffness can be avoided when machining the holes, which helps to improve the connection strength. Drilling holes in the positioning post can produce assembly holes with good hole wall quality (no burrs, delamination, or tearing), which is beneficial to improving the fatigue performance of subsequent bolted connections. At the same time, the continuous composite material hole wall also avoids the risk of delamination or media intrusion that may occur from the edges of metal holes.

[0021] By employing material matching and structural interlocking design, the embedded metal parts effectively solve the displacement problem caused by differences in thermal expansion coefficients during the hot pressing of carbon fiber composite products, and enhance the bonding reliability of the metal-composite interface. Specifically, the use of the same material as the positioning post and the composite material eliminates abrupt changes in interfacial stress caused by thermal deformation mismatch, suppressing relative displacement between the metal part and the composite layer. Furthermore, the mechanical interlocking structure formed by the positioning post embedded in the positioning hole significantly improves the shear resistance of the interface, mitigating stress concentration and delamination cracking caused by stiffness differences. This technical solution provides reliable connection technology support for the large-scale application of carbon fiber composite products under complex stress environments. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of the metal embedded part in this invention; Figure 2 This is a schematic diagram of the groove structure on the surface of the metal embedded part in this invention. Figure 1 (Zigzag shape); Figure 3 This is a schematic diagram of the groove structure on the surface of the metal embedded part in this invention. Figure 2 (Straight line); Figure 4 This is a schematic diagram of the groove structure on the surface of the metal embedded part in this invention. Figure 3 (Wave-shaped line); Figure 5 This is a schematic diagram of the groove structure on the surface of the metal embedded part in this invention. Figure 4 (Helical shape).

[0024] In the attached diagram, 100 is the metal body; 101 is the positioning hole; 102 is the groove; 110 is the positioning post; and 120 is the iron core. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Example 1: like Figure 1 As shown, a metal embedded part for carbon fiber composite products includes a metal body 100 and a positioning post 110. A positioning hole 101 is provided on the metal body 100. The positioning post 110 is made of the same material as the carbon fiber composite product. The positioning post 110 is embedded in the positioning hole 101. The upper end of the positioning post 110 protrudes from the metal body 100 and is suitable for being exposed on the surface of the carbon fiber composite product after molding.

[0028] The metal body 100 provides structural reinforcement while also providing a precise embedding reference for the positioning post 110 via the positioning hole 101. In actual manufacturing, the metal body 100 can be formed by casting, forging, or machining, and the material can be a metal with high strength and corrosion resistance, such as aluminum alloy or stainless steel. The positioning hole 101 can be processed by drilling, stamping, or laser cutting, and its shape can be designed as circular, square, or polygonal to meet different application requirements.

[0029] The positioning post 110 is made of the same resin-based composite material as the carbon fiber composite product, and is a cured columnar structure that can be interference-fitted with the metal body 100. The upper end of the positioning post 110 extends to the outer surface of the composite product, forming an additional connection between the metal body 100 and the carbon fiber composite material, which can effectively constrain the positional movement of the metal body 100 during hot pressing. After the product has cured, assembly holes can be further machined on the positioning post 110, which provides a direct positioning reference, thereby ensuring assembly accuracy.

[0030] The positioning post 110 effectively ensures the accuracy of the hole position. Since the shrinkage rates of metal and carbon fiber composite materials are different during the curing and cooling process, if the final hole is pre-drilled directly on the metal body 100, the hole position will be offset relative to the external reference of the composite material after cooling. However, by machining the hole position on the positioning post 110 after curing, it can be ensured that the hole position is consistent with the reference of the composite material product, effectively avoiding errors caused by thermal deformation.

[0031] Furthermore, since the positioning post 110 is made of the same material as the carbon fiber composite product, stress concentration caused by abrupt changes in material stiffness can be avoided when machining the holes, which helps to improve the connection strength. Drilling holes in the positioning post 110 can produce assembly holes with good hole wall quality (no burrs, delamination, or tearing), which is beneficial to improving the fatigue performance of subsequent bolted connections. At the same time, the continuous composite material hole wall also avoids the risk of delamination or media intrusion that may occur from the edges of metal holes.

[0032] This embodiment effectively solves the displacement problem caused by the difference in thermal expansion coefficients of metal embedded parts during the hot pressing of carbon fiber composite products through material matching and structural interlocking design, and enhances the bonding reliability of the metal-composite interface. Specifically, the positioning post 110, made of the same material as the composite material, eliminates the sudden change in interface stress caused by thermal deformation mismatch and suppresses the relative displacement between the metal body 100 and the composite material layer. In addition, the mechanical interlocking structure formed by the positioning post 110 embedded in the positioning hole 101 significantly improves the shear resistance of the interface and alleviates stress concentration and delamination cracking caused by stiffness differences. This technical solution provides reliable connection technology support for the large-scale application of carbon fiber composite products under complex stress environments.

[0033] Example 2: The top of the positioning post 110 has a positioning groove, and an iron core 120 that can be magnetically attracted is embedded in the positioning groove.

[0034] The positioning groove is a recessed structure opened on the top of the positioning post 110. The iron core 120 is a metal part that can be attracted by magnetic force. The positioning groove provides a precise receiving space for the iron core 120, ensuring that the iron core 120 can be firmly fixed on the positioning post 110, and facilitating subsequent precise positioning and fixation by external magnetic force.

[0035] During the hot-press curing stage, permanent magnets are placed at corresponding positions on the mold. Utilizing the magnetic attraction of the iron core 120, the metal embedded parts are firmly held in place, effectively resisting the thermal expansion and contraction stress during the hot-press curing process and preventing displacement. After curing, the iron core 120 can be removed, facilitating subsequent hole machining and fastener installation, thus avoiding the risk of assembly misalignment and interface cracking caused by displacement. This embodiment improves the positioning accuracy and interface bonding reliability of the metal embedded parts in carbon fiber composite products by setting a positioning groove containing an iron core 120 on the top of the positioning post 110, combined with the aforementioned structural design of the metal body 100 and the positioning post 110, and effectively ensures the overall performance and service life of the components under complex working conditions.

[0036] Example 3: The iron core 120 is wrapped with a hot melt wire, and the iron core 120 is fixed in the positioning groove by adhesive. One end of the hot melt wire is exposed in the positioning groove.

[0037] In this embodiment, an adhesive is used to stably fix the iron core 120 in the positioning groove, ensuring its positional stability during the hot-pressing curing stage and preventing displacement due to vibration or load. The hot-melt wire is made of a material that can melt rapidly at a specific temperature. Its function is to transfer heat to the adhesive area by melting, causing the adhesive to soften, thereby facilitating the removal of the iron core 120 after curing.

[0038] By combining hot-melt wire with adhesive fixation, this embodiment effectively solves the problem of potential damage to the positioning groove during the removal of the iron core 120. When an external heat source is applied to the exposed end of the hot-melt wire, the wire melts rapidly and concentrates the heat to the adhesive interface, causing the adhesive to soften and thus allowing the iron core 120 to be successfully removed. This method avoids the sudden change in rigid stress caused by traditional mechanical pulling and significantly reduces potential damage to the surrounding carbon fiber composite structure.

[0039] Furthermore, the design of one end of the hot-melt wire being exposed within the positioning groove allows for precise and localized application of external heating, improving heat transfer efficiency and reducing thermal impact on surrounding materials. This structure ensures the iron core 120 remains firmly fixed during the curing stage while greatly simplifying the subsequent removal process, enhancing operational controllability and convenience.

[0040] This embodiment introduces a synergistic mechanism of hot melt wire and adhesive fixation, which, while maintaining the reliability of the magnetic adsorption positioning function, further ensures the safety and structural integrity of the iron core 120 during removal. It effectively avoids the risk of interface cracking caused by stress concentration, and provides a good foundation for subsequent hole processing and fastener installation, thereby enhancing the overall manufacturing reliability and structural performance of carbon fiber composite products.

[0041] Example 4: The surface of the metal body 100 is provided with a plurality of grooves 102, which are arranged in a circumferential array with the positioning hole 101 as the center.

[0042] The groove 102 refers to a groove structure with a certain depth and width formed on the surface of the metal body 100, which can be achieved by machining, laser etching, or chemical etching. This groove 102 structure effectively enhances the physical bonding strength between the metal and the carbon fiber composite material by increasing the surface roughness and contact area of ​​the metal.

[0043] In this embodiment, grooves 102 are provided on the surface of the metal body 100. During the hot pressing process, the grooves 102 can be fully impregnated and filled with resin. After curing, a strong mechanical interlocking effect is formed, which significantly enhances the interfacial shear resistance and suppresses interlayer displacement or debonding under dynamic load.

[0044] In addition, the circumferential array arrangement of the grooves 102 centered on the positioning hole 101 is optimized for areas around the positioning hole 101 where stress concentration is likely to occur. The uniformly distributed grooves 102 disperse stress throughout the circumference, reducing the risk of excessive local stress. Especially during thermal cycling or machining, it significantly reduces the risk of microcrack initiation and propagation at the interface.

[0045] The groove 102 design in this embodiment further enhances the interfacial bonding strength between the metal embedded part and the carbon fiber composite material, effectively solving the delamination and cracking problems caused by differences in material properties, and improving the service reliability of the component under complex working conditions.

[0046] Example 5: like Figures 2-5 As shown, the groove 102 adopts one or more of the following shapes: polygonal, straight, wavy, or spiral.

[0047] In the polygonal configuration, the groove 102 is formed by combining multiple straight lines to create a continuous path with corners. This geometric feature can guide the stress to deflect at the inflection points, achieving multi-directional stress dispersion and effectively avoiding stress accumulation in a single direction.

[0048] In the wavy linear configuration, the groove 102 has a continuous and smooth curved shape. This configuration promotes a uniform distribution of stress along the length of the groove 102 through the natural transition of the curve, thereby reducing local stress concentration in the resin matrix at the interface region and suppressing the risk of brittle fracture.

[0049] In the linear configuration, the groove 102 extends radially in a straight line. When arranged in a circumferential array, this simple geometry provides a clear radial anchoring effect, which is beneficial for quickly establishing effective interfacial bond strength in the early stages of curing.

[0050] In the helical configuration, the groove 102 extends continuously in a spiral around the positioning hole 101. This configuration forms a composite anchoring path that includes both circumferential and radial components, which can synergistically resist multi-directional loads and is particularly helpful in improving the torsional and tensile resistance of the interface.

[0051] Through the optimized design of various groove shapes 102 described above, this embodiment can effectively control the stress distribution in the interface region and enhance the mechanical interlocking effect formed by the carbon fiber resin during the curing process. This structure not only inhibits the initiation and propagation of interfacial microcracks, but also alleviates the displacement problem caused by the difference in thermal expansion coefficients, thereby comprehensively improving the reliability and stability of the bonding between the metal embedded parts and the carbon fiber composite material.

[0052] Example 6: The surface of the metal body 100 is provided with a cured carbon fiber composite material layer.

[0053] The carbon fiber composite material layer is made of the same material as the main body of the carbon fiber composite product. It can be prepared by pre-laying carbon fiber prepreg on the surface of the metal body 100 and then curing it.

[0054] This embodiment effectively improves the interfacial bonding performance between the metal and the carbon fiber composite material by setting a cured carbon fiber composite material layer on the surface of the metal body 100. This intermediate layer (carbon fiber composite material layer) has the same material properties as the main composite material, enabling a smooth transition of physical properties from metal to composite material, and significantly improving the chemical compatibility and physical adsorption capacity of the interface.

[0055] Meanwhile, the carbon fiber composite layer effectively alleviates the interfacial stress caused by the difference in thermal expansion coefficients between the metal and the main composite material, and suppresses microcracks and delamination that may occur during thermal cycling, thereby significantly improving the interfacial bonding strength and long-term service reliability.

[0056] Example 7: A method for processing carbon fiber composite materials includes the following steps: S1. Lay carbon fiber prepreg tape layer by layer in the mold according to the layup design until the thickness of one layup is reached; S2. Obtain any of the metal embedded parts described above and place them in the set positions; S3. Continue to lay carbon fiber prepreg tape layer by layer on top of the metal embedded parts according to the layup design until the second layup thickness is reached. The sum of the first layup thickness and the second layup thickness is the design thickness of the carbon fiber composite material product. S4. Mold closing and hot pressing for curing; S5. Machine holes on the positioning post 110 and install fasteners.

[0057] The processing method for carbon fiber composite products, through the combination of material matching and structural interlocking design, comprehensively solves the risk of displacement of metal embedded parts during thermosetting molding, and enhances the interfacial bonding performance, thus meeting the usage requirements of carbon fiber composite products under complex stress environments. Example 8: In the processing method of carbon fiber composite material products, when the obtained metal embedded part has a positioning groove on the top of the positioning post 110, and the positioning groove contains an iron core 120 that can be magnetically attracted, the processing method of carbon fiber composite material products further includes the following steps: Step S3.5, which is set between step S3 and step S4, is to set a permanent magnet that is magnetically attracted to the positioning post 110 at the corresponding position of the mold. Step S4.5 is set between steps S4 and S5, and step S4.5 is to remove the iron core 120.

[0058] The metal embedded parts are fixed in the designated position of the mold by magnetic adsorption, thereby effectively resisting the displacement stress caused by the difference in the thermal expansion coefficient of the materials during the hot pressing and curing process. The removal of the iron core 120 can be achieved by mechanical means, heating and melting, or other non-destructive means, to facilitate subsequent machining of holes and installation of fasteners, while ensuring the overall structural integrity of the carbon fiber composite product.

[0059] The above technical solution solves the problem of easy positional displacement of metal embedded parts during the hot pressing curing stage, ensures the docking accuracy of connecting ear plates during assembly, and improves the integrity of the structure and the reliability of assembly. Example 9: When the iron core 120 in the acquired metal embedded part is fixed in the positioning groove by adhesive, one end of the hot melt wire is exposed in the positioning groove. The method to remove the iron core 120 is to heat the hot melt wire. After the adhesive area is melted, the iron core 120 can be removed by magnetic attraction or other means.

[0060] The adhesive area softens and melts after being heated locally, which significantly reduces the bonding strength between the iron core 120 and the sink, so that the removal process does not require mechanical force to forcibly separate them.

[0061] Example 10: A carbon fiber composite material product is manufactured using any of the above-described processing methods for carbon fiber composite materials. The carbon fiber composite material product can be an automotive body panel, a scooter shell for a new energy vehicle, or an automotive interior component, etc.

[0062] The above are merely preferred embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A metal embedded part for carbon fiber composite products, characterized in that, include: The metal part body has positioning holes. The positioning post is made of the same material as the carbon fiber composite product. The positioning post is embedded in the positioning hole, and the upper end of the positioning post protrudes from the metal body and is suitable for being exposed on the surface of the carbon fiber composite product after molding.

2. The metal embedded part according to claim 1, characterized in that, The top of the positioning post has a positioning groove, and an iron core that can be magnetically attracted is embedded in the positioning groove.

3. The metal embedded part according to claim 2, characterized in that, The iron core is wrapped with hot melt wire, and the iron core is fixed in the positioning groove by adhesive. One end of the hot melt wire is exposed in the positioning groove.

4. The metal embedded part according to claim 1, characterized in that, The surface of the metal part body is provided with multiple grooves, which are arranged in a circumferential array with the positioning hole as the center.

5. The metal embedded part according to claim 4, characterized in that, The groove is one or more of the following shapes: polygonal, wavy, straight, or spiral.

6. The metal embedded part according to claim 1, characterized in that, The surface of the metal part body is provided with a cured carbon fiber composite material layer.

7. A method for processing carbon fiber composite materials, characterized in that, Includes the following steps: S1. Lay carbon fiber prepreg tape layer by layer in the mold according to the layup design until the thickness of one layup is reached; S2. Obtain the metal embedded part as described in any one of claims 1 to 6, and place it in the set position; S3. Continue to lay carbon fiber prepreg tape layer by layer on top of the metal embedded parts according to the layup design until the second layup thickness is reached. The sum of the first layup thickness and the second layup thickness is the design thickness of the carbon fiber composite material product. S4. Mold closing and hot pressing for curing; S5. Machining holes on the positioning pins and installing fasteners.

8. The processing method for carbon fiber composite materials according to claim 7, characterized in that, When the obtained metal embedded part is the metal embedded part as described in claim 2 or 3, the step further includes: S3.

5. Permanent magnets that are magnetically attracted to the positioning pillars are set at the corresponding positions of the mold. S4.5, Remove the iron core.

9. The processing method for carbon fiber composite materials according to claim 8, characterized in that, When the metal embedded part obtained is the metal embedded part as described in claim 3, the method for removing the iron core is to heat the hot melt wire and remove the iron core after the adhesive area has melted.

10. A carbon fiber composite material product, characterized in that, The carbon fiber composite material is prepared by the processing method described in any one of claims 7 to 9.

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