Curved carbon nanotube honeycomb cementation assembly process and curved carbon nanotube honeycomb core

Abstract

The application provides a curved carbon tube honeycomb cementing assembly process method and a curved carbon tube honeycomb core, and comprises the following steps: S1, processing an assembly mold and a sticking mold; S2, using a carbon tube adhesive film to assist in positioning and sticking the mold; S3, cementing carbon tubes in the cementing assembly mold; S4, cementing graphite reference blocks in the carbon tubes at the central positions of four quadrants; S5, placing an equalizing plate on a non-sticking tooling surface, and curing the carbon tube honeycomb on the mold; S6, performing high and low temperature treatment and vacuum degassing on the carbon tube honeycomb on the mold; S7, positioning the carbon tube honeycomb in a supporting tooling, setting an expansion type clamping device, and quantitatively pressing the inner wall of the carbon tube; S8, processing a convex curved surface on the carbon tube honeycomb according to a model; S9, assembling the carbon tube honeycomb on a honeycomb convex surface supporting mold, and fixing the carbon tube honeycomb by using the expansion type clamping device; and S10, processing a concave curved surface on the carbon tube honeycomb according to a model.

Description

Technical Field

[0001] This invention belongs to the field of adhesive bonding and assembly of carbon fiber composite materials. Specifically, it relates to the adhesive bonding and assembly process of curved carbon tube honeycomb and the curved carbon tube honeycomb core, and in particular to a large-size, high-precision, low-temperature deformable curved carbon tube honeycomb adhesive bonding and assembly process. Background Technology

[0002] The reflector of a sandwich antenna consists of inner and outer skins and a honeycomb core. The material and structure of the honeycomb core have a significant impact on the surface accuracy, dimensional stability, specific strength, and specific stiffness of the antenna reflector. With the increasing difficulty of space exploration missions, there are further requirements for lightweight, large-scale, higher precision, and higher stability of traditional sandwich antenna reflectors.

[0003] In the current technology, antenna reflectors are mostly used in LEO orbits, but the dimensional stability of the antenna profile cannot meet the requirements for stable operation in GEO orbits.

[0004] Traditional composite sandwich honeycomb structures use aluminum alloy cores. The difference in thermal expansion coefficients between the aluminum alloy core and the skin affects the stability of high-precision profiles. Furthermore, hexagonal or rectangular carbon honeycomb structures are difficult to mold, prone to internal defects, and the manufacturing technology is immature. Therefore, it is necessary to develop a large curved honeycomb structure that maintains high precision, high stability, and is lightweight and high-strength in environments with large temperature differences. The molding process for circular thin-walled carbon nanotubes is mature. Using a high-temperature resistant adhesive film to bond and assemble circular carbon nanotubes into a honeycomb core can achieve the design goals of antenna reflectors for GEO orbit operation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a curved carbon nanotube honeycomb bonding assembly process and a curved carbon nanotube honeycomb core.

[0006] The present invention provides a method for bonding and assembling curved carbon nanotubes into a honeycomb structure, comprising the following steps:

[0007] Step S1: Process the stepped carbon tube bonding assembly mold and the carbon tube adhesive film auxiliary positioning and pasting mold;

[0008] Step S2: Use carbon nanotube adhesive film to assist in positioning and pasting the mold, and paste high-temperature resistant adhesive film on the side wall of each round carbon nanotube;

[0009] Step S3: Circular carbon tubes with high-temperature resistant adhesive film are glued and pasted in the stepped carbon tube bonding assembly mold to ensure that there is adhesive film between any two contact points of circular carbon tubes, forming a stepped carbon tube array.

[0010] Step S4: Bond the reference block inside the circular carbon nanotube at the center position of the four quadrants;

[0011] Step S5: Place an equalizing plate on the non-attached surface of the stepped carbon nanotube array, and use an autoclave process to perform high-temperature vacuum curing of the circular carbon nanotube honeycomb on the stepped carbon nanotube bonding assembly mold.

[0012] Step S6: Perform high and low temperature treatment and vacuum degassing on the carbon nanotube honeycomb on the stepped support mold;

[0013] Step S7: Based on the reference block, position the carbon nanotube honeycomb inside the stepped carbon nanotube bonding equipment mold, set an expansion clamping device in multiple circular carbon nanotubes, automatically align the axis of the circular carbon nanotubes, and apply uniform and quantitative pressure to the radial wall of the circular carbon nanotubes.

[0014] Step S8: Machining the convex curved surface of the carbon nanotube honeycomb according to the product and mold combination model, and performing rough grinding and fine grinding;

[0015] Step S9: Flip the carbon nanotube honeycomb over and assemble it onto the honeycomb convex support mold. Align the carbon nanotube honeycomb with the honeycomb convex support mold according to the reference hole on the reference block. The product fits the curved surface of the honeycomb convex support mold. Use an expansion clamping device to fix the carbon nanotube honeycomb.

[0016] Step S10: Process the concave curved surface of the carbon nanotube honeycomb according to the product and mold combination model, and perform rough grinding and fine grinding.

[0017] Step S11: Using a high-precision laser tracking measuring instrument and auxiliary measuring block, sampling points on the machined surface of the curved carbon nanotube honeycomb, and comparing the resulting point cloud with the surface of the measurement model.

[0018] Preferably, in step S1, the stepped carbon nanotube bonding assembly mold is terraced in shape, with the steps getting higher closer to the center of the mold. The step height is 20mm-50mm, and a carbon nanotube positioning block is set on the mold every 300mm-600mm.

[0019] Preferably, in step S1, the carbon nanotube adhesive film auxiliary positioning and pasting mold includes an adhesive film heating wire and an adhesive film positioning device. Heating increases the adhesion of the adhesive film on the carbon nanotube surface, ensuring the accuracy and stability of the adhesive film placement on the outer wall of each round carbon nanotube.

[0020] Preferably, in step S2, the diameter of the circular carbon tube is φ20mm-φ50mm, the wall thickness is 0.2mm-1mm, the carbon fiber grade is CCM55J, and it is formed by winding process; the width of the high temperature resistant film on the side of the circular carbon tube is 5mm-10mm, the length of the film is consistent with the length of the carbon tube, the included angle of the three films on each circular carbon tube is 120°, and the film grade is J-310A.

[0021] Preferably, in step S3, at any two circular carbon tubes bonded together, a clip is used to fix adjacent circular carbon tubes, and the contact point of the circular carbon tubes is the midpoint of the width direction of the strip adhesive film.

[0022] Preferably, in step S5, the assembly gap between all the sidewalls of the circular carbon tubes and the stepped carbon tube bonding assembly mold is ≥5mm, and the bonding gap between the bottom end face of the circular carbon tube and the stepped carbon tube bonding assembly mold is ≤0.1mm.

[0023] Preferably, in step S5, before the carbon nanotube honeycomb is heated and cured, a pressure equalizing plate and a vacuum bag are used to pre-press the circular carbon nanotubes. The vacuum degree is ≤-0.09MPa and the pre-pressing time is 2-4h, so that the carbon nanotube honeycomb can replicate the stepped mold surface with higher precision.

[0024] Preferably, in step S5, the curing temperature is 130℃±5℃, the heat preservation time is 4h, the vacuum gauge pressure is ≤-0.095MPa, the heating rate is 3℃ / min, and a stepped carbon nanotube honeycomb is formed after curing.

[0025] Preferably, in step S6, the temperature range for the high and low temperature treatment is -70℃ to 130℃, and the vacuum degassing pressure is ≤7×10⁻⁶. -3 Pa, temperature 130℃, heat preservation time 72h.

[0026] Preferably, in steps S8 and S10, the processing sequence is to first process the convex surface of the carbon tube honeycomb, and then process the concave surface of the carbon tube honeycomb; the mold axis is along the normal of the curved surface at the processing location, and a ventilation opening is processed on the non-bonded part of the end of the carbon tube on the convex surface of the honeycomb, with the opening size being 1-2mm wide and 1-2mm deep, and the finishing allowance being 0.05mm; after machining, a curved carbon tube honeycomb core is formed.

[0027] Preferably, in step S11, the auxiliary measuring block is placed at the end face of a triangular area formed by three carbon tubes, with a sampling interval of 20mm-50mm; the auxiliary measuring block is made of Invar steel.

[0028] The curved carbon nanotube honeycomb core provided by the present invention is prepared by a curved carbon nanotube honeycomb adhesive bonding assembly process.

[0029] Preferably, the overall size of the curved carbon nanotube honeycomb core is 3.5m×3.5m, the RMS value of the honeycomb core surface is ≤40μm, and the RMS value of the reflective surface of the all-carbon sandwich structure made using the honeycomb core is ≤5μm, which can be used in an environment of -70℃ to 130℃.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In this invention, the curved honeycomb core is made of carbon fiber composite material. Combined with the structural design of carbon fiber parts, it can produce honeycomb with a near-zero coefficient of thermal expansion, which has higher stability than conventional aluminum honeycomb. The thermal deformation profile change of the all-carbon reflector made using this honeycomb is only 1 / 3 of that of the carbon skin aluminum honeycomb reflector, which meets the requirements for operation on GEO orbit.

[0032] 2. In this invention, the curved honeycomb core is composed of circular thin-walled carbon nanotube parts. These parts have high quality stability, and the uniform array structure assembled by adhesive bonding can be filled in lightweight curved sandwich layers of various shapes and sizes, and has a wide range of applications.

[0033] 3. In this invention, carbon nanotube parts are first formed into a stepped carbon nanotube array and then processed into a curved surface structure. The carbon nanotube parts used have the same height, diameter and wall thickness, which is conducive to mass production and automated production of parts, and improves the production efficiency and quality stability of parts.

[0034] 4. The carbon honeycomb molding mold of the present invention is a convex terraced shape. During machining, the mold can be directly used as a support tool. First, the convex surface of the honeycomb core is machined to form a good machining reference for turning and grinding the concave surface. The functional concave surface of the assembled full carbon sandwich structure has better surface accuracy.

[0035] 5. This invention uses a laser tracker and auxiliary measuring blocks to detect the honeycomb core surface, replacing the blue light scanning measuring instrument and dedicated online high-precision curved surface measurement and grinding system that are often required for high-precision honeycomb surface measurement. This reduces measurement costs and difficulty, and improves the versatility of carbon honeycomb curved surface processing and measurement.

[0036] 6. The high-precision thin-walled circular carbon tube curved honeycomb prepared by the method of the present invention has a smaller amount of thermal deformation compared with aluminum honeycomb and paper honeycomb, and can maintain higher dimensional stability in environments with large temperature differences.

[0037] 7. Compared with hexagonal or rectangular carbon honeycomb, the present invention has fewer bonding defects, lower density, and better processability.

[0038] 8. This invention can be applied to the molding of large-size, high-precision, low-temperature deformable curved carbon nanotube honeycomb sandwich structure products, such as large high-precision spaceborne reflectors. Attached Figure Description

[0039] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0040] Figure 1 A top view of a stepped carbon nanotube bonding assembly mold;

[0041] Figure 2 This is a photograph of a method for bonding and fixing circular carbon nanotubes together.

[0042] Figure 3 This is a photograph of the stepped carbon nanotube honeycomb structure formed after curing and demolding.

[0043] Figure 4 This is a physical image of a large-size, high-precision, low-temperature deformable curved carbon nanotube honeycomb core.

[0044] Figure 5 This is a schematic diagram of a large-size, high-precision, low-temperature deformable curved carbon nanotube honeycomb core. Detailed Implementation

[0045] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0046] The present invention provides a method for bonding and assembling curved carbon nanotubes into a honeycomb structure, the specific steps of which are as follows:

[0047] Step S1: Processing the stepped carbon nanotube bonding assembly mold and the carbon nanotube adhesive film auxiliary positioning and pasting mold; In step S1, the stepped carbon nanotube bonding assembly mold is generally terraced, with the steps getting higher closer to the center of the mold, and the step height is 20mm-50mm, such as... Figure 1 As shown; a carbon nanotube positioning block is set on the mold at intervals of 300mm-600mm. In step S1, the carbon nanotube adhesive film auxiliary positioning and pasting mold contains an adhesive film heating wire and an adhesive film positioning device. The temperature is raised to improve the adhesion of the adhesive film on the surface of the carbon nanotube and to ensure the accuracy and stability of the adhesive film laying position on the outer wall of each round carbon nanotube.

[0048] Step S2: Using carbon nanotube adhesive film to assist in positioning and pasting the mold, three high-temperature resistant adhesive films are evenly pasted on the side wall of each circular carbon nanotube. In step S2, the diameter of the circular carbon nanotube is φ20mm-φ50mm, the wall thickness is 0.2mm-1mm, the carbon fiber grade is CCM55J, and it is formed by winding process. The width of the high-temperature resistant adhesive film on the side of the circular carbon nanotube is 5mm-10mm, the length of the adhesive film is the same as the length of the carbon nanotube, the included angle of the three adhesive films on each circular carbon nanotube is 120°, and the adhesive film grade is J-310A.

[0049] Step S3: Glue the circular carbon tubes together in the stepped carbon tube bonding assembly mold, ensuring that there is adhesive film adhering between any two contact points of the circular carbon tubes; in step S3, at any two bonding points of the circular carbon tubes, use a clip to fix adjacent circular carbon tubes, with the contact point of the circular carbon tubes being the midpoint of the width direction of the strip adhesive film, such as... Figure 2 As shown.

[0050] Step S4: Glue graphite reference blocks into the circular carbon tubes located in the center of the four quadrants, and set a waist-shaped reference hole on each graphite reference block;

[0051] Step S5: A pressure equalizing plate is placed on the non-attached surface of the stepped carbon nanotube array. Using an autoclave process, the circular carbon nanotube honeycomb is subjected to high-temperature vacuum curing on the stepped carbon nanotube bonding assembly mold. There are exactly three points of support between the curing platform and the stepped carbon nanotube bonding assembly mold. In step S5, the assembly gap between all the sidewalls of the circular carbon nanotubes and the stepped carbon nanotube bonding assembly mold is ≥5mm, and the bonding gap between the bottom end face of the circular carbon nanotubes and the stepped carbon nanotube bonding assembly mold is ≤0.1mm. This prevents the circular carbon nanotubes from being subjected to lateral force from the tooling during curing, which could cause deformation of the carbon nanotube honeycomb after demolding and affect the accuracy of the honeycomb surface. In step S5, before the carbon nanotube honeycomb is heated and cured, a pressure equalizing plate and a vacuum bag are used to pre-press the circular carbon nanotubes. The vacuum degree is ≤-0.09MPa, and the pre-pressing time is 2-4 hours, allowing the carbon nanotube honeycomb to replicate the stepped mold surface with higher accuracy. In step S5, the curing temperature is 130℃±5℃, the holding time is 4h, the vacuum gauge pressure is ≤-0.095MPa, and the heating rate is 3℃ / min. The stepped carbon nanotube honeycomb formed after curing is as follows: Figure 3 As shown.

[0052] Step S6: Perform high and low temperature treatment and vacuum degassing on the carbon nanotube honeycomb on the stepped support mold. The high and low temperature treatment and vacuum degassing platform has exactly three support points with the stepped support mold. In step S6, the temperature range of the high and low temperature treatment is -70℃ to 130℃, and the vacuum degassing pressure is ≤7×10⁻⁶. -3 Pa, temperature 130℃, heat preservation time 72h.

[0053] Step S7: The stepped carbon tube bonding assembly mold serves as a machining support fixture for the convex surface of the carbon tube honeycomb. Based on the waist-shaped reference hole on the graphite material reference, the carbon tube honeycomb is positioned in the support fixture. An expansion clamping device is set in multiple circular carbon tubes to automatically align the axis of the circular carbon tube and apply uniform and quantitative pressure to the radial wall of the circular carbon tube.

[0054] Step S8: Machining the convex curved surface of the carbon nanotube honeycomb according to the product and mold combination model, using a five-axis machine tool for high-speed grinding roughing and finishing, with the tool rotation direction consistent with the winding direction of the outer fiber of the circular carbon nanotube, and finishing the waist-shaped reference hole on the graphite reference.

[0055] Step S9: Flip the carbon nanotube honeycomb and assemble it onto the honeycomb convex support mold. Align the carbon nanotube honeycomb with the honeycomb convex support mold according to the waist-shaped reference hole. The product fits the curved surface of the honeycomb convex support mold. Use an expansion clamping device to fix the carbon nanotube honeycomb.

[0056] Step S10: Process the concave curved surface of the carbon nanotube honeycomb according to the product and mold combination model, and perform high-speed grinding roughing and finishing using a five-axis machine tool. The rotation direction of the tool is consistent with the winding direction of the outer layer fiber of the round carbon nanotube.

[0057] Step S11: Using a high-precision laser tracking measuring instrument and an auxiliary measuring block, sampling points on the machined surface of the large curved carbon nanotube honeycomb is performed, and the resulting point cloud is compared with the surface of the measurement model. In step S11, the auxiliary measuring block is placed at the end face of the triangular area formed by every 3 carbon nanotubes, with a sampling interval of 20mm-50mm; the auxiliary measuring block is made of Invar steel, which has wear resistance and dimensional stability.

[0058] In steps S8 and S10, the processing sequence is to first process the convex surface of the carbon nanotube honeycomb, and then process the concave surface of the carbon nanotube honeycomb, to ensure that the concave surface of the carbon nanotube honeycomb functional surface has a better processing reference and achieves better surface accuracy; the mold axis is along the normal of the curved surface at the processing location, and a ventilation opening is processed on the non-bonded part of the carbon nanotube end on the honeycomb convex surface. The opening size is 1-2mm wide and 1-2mm deep, with a finishing allowance of 0.05mm; the curved carbon nanotube honeycomb core formed after machining is as follows: Figure 4 As shown.

[0059] The present invention also provides a curved carbon nanotube honeycomb core, which is prepared by a curved carbon nanotube honeycomb adhesive bonding assembly process.

[0060] The curved carbon nanotube honeycomb core prepared by the method of the present invention can reach an overall size of 3.5m×3.5m, and the RMS value of the honeycomb core surface is ≤40μm. The RMS value of the reflective surface of the all-carbon sandwich structure made using the honeycomb core is ≤5μm, and it can be used in an environment of -70℃ to 130℃.

[0061] The curved carbon nanotube honeycomb core prepared by the method of this invention can be widely used in high-precision, high-stability, lightweight and high-strength sandwich structure products.

[0062] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0063] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for bonding and assembling curved carbon nanotubes into a honeycomb structure, characterized in that, Includes the following steps: Step S1: Obtain the stepped carbon nanotube bonding assembly mold and the carbon nanotube adhesive film auxiliary positioning and pasting mold; Step S2: Use carbon nanotube adhesive film to assist in positioning and pasting the mold, and paste high-temperature resistant adhesive film on the side wall of each round carbon nanotube; Step S3: Circular carbon tubes with high-temperature resistant adhesive film are glued and pasted in the stepped carbon tube bonding assembly mold to ensure that there is adhesive film between any two contact points of circular carbon tubes, forming a stepped carbon tube array. Step S4: Bond the reference block inside the circular carbon nanotube at the center position of the four quadrants; Step S5: Place an equalizing plate on the non-attached surface of the stepped carbon nanotube array, and use an autoclave process to perform high-temperature vacuum curing of the circular carbon nanotube honeycomb on the stepped carbon nanotube bonding assembly mold. Step S6: Perform high and low temperature treatment and vacuum degassing on the carbon nanotube honeycomb on the stepped support mold; Step S7: Based on the reference block, position the carbon nanotube honeycomb in the stepped carbon nanotube bonding assembly mold, set an expansion clamping device in multiple circular carbon nanotubes, automatically align the axis of the circular carbon nanotubes, and apply uniform and quantitative pressure to the radial wall of the circular carbon nanotubes. Step S8: Machining the convex curved surface of the carbon nanotube honeycomb according to the product and mold combination model, and performing rough grinding and fine grinding; Step S9: Flip the carbon nanotube honeycomb over and assemble it onto the honeycomb convex support mold. Align the carbon nanotube honeycomb with the honeycomb convex support mold according to the reference hole on the reference block. The product fits the curved surface of the honeycomb convex support mold. Use an expansion clamping device to fix the carbon nanotube honeycomb. Step S10: Process the concave curved surface of the carbon nanotube honeycomb according to the product and mold combination model, and perform rough grinding and fine grinding. Step S11: Using a laser tracking measuring instrument and auxiliary measuring block, sampling points on the machined surface of the curved carbon nanotube honeycomb, and comparing the resulting point cloud with the surface of the measurement model.

2. The curved carbon nanotube honeycomb bonding assembly process according to claim 1, characterized in that, In step S1, the stepped carbon nanotube bonding assembly mold is terraced in shape. The closer to the center of the mold, the higher the step surface is, with a step height of 20mm-50mm. A carbon nanotube positioning block is set on the mold every 300mm-600mm.

3. The curved carbon nanotube honeycomb bonding assembly process according to claim 1, characterized in that, In step S1, the carbon nanotube adhesive film auxiliary positioning and pasting mold includes an adhesive film heating wire and an adhesive film positioning device, which raises the temperature to improve the adhesion of the adhesive film on the carbon nanotube surface.

4. The curved carbon nanotube honeycomb bonding assembly process according to claim 1, characterized in that, In step S2, the diameter of the circular carbon tube is φ20mm-φ50mm, the wall thickness is 0.2mm-1mm, the carbon fiber grade is CCM55J, and it is formed by winding process; the width of the high temperature resistant film on the side of the circular carbon tube is 5mm-10mm, the length of the film is the same as the length of the carbon tube, the three films on each circular carbon tube are spaced at an angle of 120°, and the film grade is J-310A.

5. The curved carbon nanotube honeycomb bonding assembly process according to claim 1, characterized in that, In step S3, at any two circular carbon nanotubes bonded together, adjacent circular carbon nanotubes are fixed with clips, and the contact point of the circular carbon nanotubes is the midpoint of the width direction of the strip adhesive film.

6. The curved carbon nanotube honeycomb bonding assembly process according to claim 1, characterized in that, In step S5, the assembly gap between all the sidewalls of the circular carbon tubes and the stepped carbon tube bonding assembly mold is ≥5mm, and the bonding gap between the bottom end face of the circular carbon tube and the stepped carbon tube bonding assembly mold is ≤0.1mm.

7. The curved carbon nanotube honeycomb bonding assembly process according to claim 1, characterized in that, In step S5, before the carbon nanotube honeycomb is heated and cured, a pressure equalizing plate and a vacuum bag are used to pre-press the round carbon nanotubes. The vacuum degree is ≤-0.09MPa and the pre-pressing time is 2-4h, so that the carbon nanotube honeycomb replicates the stepped mold surface. In step S5, the curing temperature is 130℃±5℃, the heat preservation time is 4h, the vacuum gauge pressure is ≤-0.095MPa, the heating rate is 3℃ / min, and a stepped carbon nanotube honeycomb is formed after curing. In step S6, the temperature range for the high and low temperature treatment is -70℃ to 130℃, and the vacuum degassing pressure is ≤7×10⁻⁶. -3 Pa, temperature 130℃, heat preservation time 72h.

8. The curved carbon nanotube honeycomb bonding assembly process according to claim 1, characterized in that, In steps S8 and S10, the processing sequence is to first process the convex surface of the carbon nanotube honeycomb, and then process the concave surface of the carbon nanotube honeycomb. The mold axis is along the normal of the curved surface at the processing location. A ventilation opening is processed on the non-bonded part of the end of the carbon nanotube on the convex surface of the honeycomb. The opening size is 1-2mm wide and 1-2mm deep, and the finishing allowance is 0.05mm. After machining, a curved carbon nanotube honeycomb core is formed.

9. The curved carbon nanotube honeycomb bonding assembly process according to claim 1, characterized in that, In step S11, the auxiliary measuring block is placed at the end face of a triangular area formed by three carbon tubes, with a sampling interval of 20mm-50mm; the auxiliary measuring block is made of Invar steel.

10. A curved carbon nanotube honeycomb core, characterized in that, It is prepared by any one of the curved carbon nanotube honeycomb bonding assembly processes according to claims 1 to 9; The curved carbon nanotube honeycomb core has an overall size of 3.5m×3.5m, and the RMS value of the honeycomb core surface is ≤40μm. The RMS value of the reflective surface of the all-carbon sandwich structure made using this honeycomb core is ≤5μm, and it can be used in environments ranging from -70℃ to 130℃.

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