Forming method of low-density corrugated carbon honeycomb

Abstract

The invention discloses a forming method of a low-density corrugated carbon honeycomb, and relates to the technical field of composite material forming, and the forming method comprises the following steps: using a carbon fiber unidirectional prepreg layer to obtain a carbon fiber prepreg lamination layer; the carbon fiber prepreg lamination layer is attached to the inner surface of an upper mold and the inner surface of a lower mold, the lower mold is a layering mold made of aluminum alloy, the inner side of the upper mold is a flexible pressure transmitting mold made of silicone rubber, then the upper mold, the carbon fiber prepreg lamination layer and the lower mold are integrally cured, and a carbon fiber corrugated strip blank is obtained; processing the carbon fiber corrugated strip blank by adopting non-contact pulse laser ablation to obtain a single-layer corrugated strip; and bonding the single-layer corrugated strips to obtain the corrugated carbon honeycomb. The problems that due to the current manufacturing process, the performance indexes such as large minimum wall thickness and high average density of the corrugated carbon fiber honeycomb are difficult to meet the application requirements are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material forming, and relates to a forming method for a honeycomb core of a carbon fiber reinforced resin matrix composite material. Background Art

[0002] A honeycomb sandwich structure is a sandwich structural member formed by bonding two high-strength and thin panels with a lightweight honeycomb core material in the middle by an adhesive. It is a structural form widely used in spacecraft products.

[0003] The honeycomb core material in traditional sandwich structures generally selects aluminum alloy perforated honeycomb cores. As honeycomb sandwich structures are increasingly applied to various spacecraft products, especially products with high-precision and high thermal stability requirements such as antenna reflectors, more and more stringent requirements are imposed on the thermal stability of the sandwich structure. The honeycomb sandwich structure manufactured with traditional aluminum alloy honeycomb cores can no longer meet the requirements of some high-precision structures working in harsh temperature environments for thermal stability. For the honeycomb core prepared from carbon fiber composite materials, although its coefficient of thermal expansion is significantly lower than that of the traditional aluminum alloy honeycomb sandwich structure, limited by the existing forming process methods, its density is greater than that of the traditional aluminum alloy honeycomb sandwich. There is an urgent need to find a forming process method suitable for the forming of lightweight and thin-walled composite material honeycomb cores for production. Summary of the Invention

[0004] The technical problem solved by this application is: overcoming the deficiencies of the prior art, providing a forming method for a low-density corrugated carbon honeycomb, and solving the problem that the performance indicators such as the large minimum wall thickness and high average density of the corrugated carbon fiber honeycomb caused by the current manufacturing process are difficult to meet the application requirements.

[0005] The technical solution provided by this application is as follows:

[0006] A forming method for a low-density corrugated carbon honeycomb, comprising:

[0007] Using carbon fiber unidirectional prepreg for layup to obtain a carbon fiber prepreg laminate;

[0008] Bonding the carbon fiber prepreg laminate to the inner surfaces of the upper mold and the lower mold. The lower mold is a layup mold made of aluminum alloy, and the upper mold is a flexible pressure transfer mold with a silicone rubber material on the inner side. Then, the upper mold, the carbon fiber prepreg laminate, and the lower mold are cured as a whole to obtain a carbon fiber corrugated strip blank;

[0009] Processing the carbon fiber corrugated strip blank by non-contact pulsed laser ablation to obtain a single-layer corrugated strip;

[0010] Gluing the single-layer corrugated strips to obtain a corrugated carbon honeycomb.

[0011] Further, when laying the carbon fiber unidirectional prepreg, the single-layer thickness of the carbon fiber unidirectional prepreg is 0.03 - 0.08 mm, and the number of laying layers is 2 - 4 layers.

[0012] Further, the non-contact pulsed laser ablation is used to process the carbon fiber corrugated strip blank, including:

[0013] Hole making, processing ventilation holes on the non-bonding surface of the carbon fiber corrugated strip blank;

[0014] Pretreatment, cutting is carried out on the carbon fiber corrugated strip blank according to the height of a single-layer corrugated strip. When the cutting reaches 80% - 90% of the thickness of the carbon fiber corrugated strip blank, one pretreatment cutting is completed; then multiple pretreatment cuttings are sequentially carried out along the wavelength direction of the carbon fiber corrugated strip blank until all the pretreatment cuttings are completed in the wavelength direction of the carbon fiber corrugated strip blank;

[0015] Seam processing, the part between two adjacent pretreatment cuttings is a seam, and cutting processing is carried out on the seam. The processing depth of the seam is the same as the processing depth of the cutting seam obtained by the pretreatment cutting;

[0016] Post-treatment, multiple post-treatments are sequentially carried out along the wavelength direction of the carbon fiber corrugated strip blank, and the remaining thickness of the carbon fiber corrugated strip blank is cut off to obtain a single-layer corrugated strip.

[0017] Further, the laser parameters for hole-making processing are pulse width 95 - 105 ns, scanning speed 95 - 105 mm / s, and scanning times 10; the laser parameters for pretreatment cutting are pulse width 95 - 105 ns, scanning speed 95 - 105 mm / s, and scanning times 50; the laser parameters for seam processing are pulse width 195 - 205 ns, scanning speed 290 - 310 mm / s, and scanning times 40; the laser parameters for post-treatment processing are pulse width 55 - 65 ns, scanning speed 195 - 205 mm / s, and scanning times 10.

[0018] Further, before using the non-contact pulsed laser ablation to process the carbon fiber corrugated strip blank, the carbon fiber corrugated strip blank is first clamped and fixed by a clamping tooling;

[0019] The clamping tooling includes a pressing plate. A plurality of mutually parallel processing grooves are opened on the pressing plate. The processing grooves are perpendicular to the length direction of the concave position of the carbon fiber corrugated strip blank. A plurality of pressing teeth are arranged on one side of the pressing plate, and the pressing teeth cooperate with the concave position of the carbon fiber corrugated strip blank.

[0020] Furthermore, the use of a clamping tool to clamp and fix the carbon fiber corrugated strip blank includes: aligning the processing groove of the pressing plate perpendicular to the length direction of the recessed position of the carbon fiber corrugated strip blank, and aligning the side of the pressing plate with the pressing teeth to the recessed position of the carbon fiber corrugated strip blank, and then pressing the pressing plate onto the carbon fiber corrugated strip blank to complete the clamping.

[0021] Furthermore, when the single-layer corrugated strips are glued, a pressurized gluing tool is used for gluing, and the pressurized gluing tool includes a gluing base, a movable pressure strip and a fixed pressure strip, the fixed pressure strip is fixedly connected to the working surface of the gluing base, the fixed pressure strip includes a plurality of fixed columns perpendicular to the working surface, the plurality of fixed columns are arranged in sequence along a straight line direction, each fixed column is used to contact the back side of the gluing surface of the single-layer corrugated strip 1; the movable pressure strip is slidably connected to the working surface of the gluing base, and a plurality of convex strips are provided on the side of the movable pressure strip facing the fixed pressure strip, each convex strip corresponds one-to-one to the fixed column, and the convex strip is used to contact the back side of the gluing surface of another single-layer corrugated strip 1.

[0022] Furthermore, one end of the movable pressure strip away from the working surface of the bonding base is fixedly connected with a blocking piece, and the blocking piece is used to limit the position of the single-layer corrugated strip 1.

[0023] Furthermore, a driving screw is threadedly connected to the adhesive base, the axis of the driving screw is parallel to the moving direction of the movable pressure strip, the driving screw is located on the side of the movable pressure strip away from the fixed pressure strip, and the end of the driving screw contacts the movable pressure strip to drive the movable pressure strip to move.

[0024] In summary, this application at least includes the following beneficial technical effects:

[0025] The present invention avoids the problem of product molding defects such as "bridging" at the corners of the vacuum bag film due to its corrugated characteristics when curing in an oven or autoclave using a traditional rigid mold, resulting in insufficient pressure transmission and breakage of the vacuum bag film, thereby improving the reliability of pressurization during the curing process of a large-curvature corrugated laminate structure.

[0026] The present invention adopts non-contact pulse laser processing instead of traditional mechanical processing, which solves the problems of easy deformation and crushing of thin-walled special-shaped carbon fiber laminated structures during installation and difficulty in processing micropores, thereby improving the processing yield and processing efficiency; it adopts special gluing tooling to replace manual gluing, thereby realizing multi-sided one-time rapid gluing, solving the problem that the manual gluing pressurization efficiency does not meet the constraints of the adhesive operation window period, and improving the gluing dimensional accuracy and gluing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the corrugated carbon fiber honeycomb structure of the present application;

[0028] Figure 2Schematic diagram of the corrugated carbon fiber laminated structure of the present invention used in this application; Figure 2 Among them, the dimension 800+ corresponds to the final length of the carbon honeycomb in the L direction, and the dimension 25±0.2 corresponds to the height dimension and tolerance requirements after cutting. The right view is a schematic diagram of the cross-sectional configuration of the corrugated strip, the position and size of the ventilation holes;

[0029] Figure 3 Schematic diagram of the cutting and clamping of the corrugated carbon fiber of the present invention used in this application;

[0030] Figure 4 Schematic diagram of the bonding tooling for the low-density corrugated carbon honeycomb;

[0031] Figure 5 Schematic diagram of the carbon honeycomb bonding process, where Figure a is the overall structure diagram of the bonding tooling, Figure b is the relative position diagram of the fixed pressing strip and the first corrugated strip, and Figure c is the top view of the bonding tooling;

[0032] Figure 6 For the bonding tooling pressurization process.

[0033] Explanation of the reference numerals in the attached drawings: 1 - single-layer corrugated strip;

[0034] 2 - carbon fiber corrugated strip blank; 21 - ventilation hole;

[0035] 3 - pressing plate; 31 - processing groove;

[0036] 41 - bonding base, 42 - movable pressing strip, 43 - fixed pressing strip, 44 - retaining piece, 45 - driving screw.

[0037] 51 - first corrugated strip, 52 - second corrugated strip, 53 - carbon fiber honeycomb. Detailed implementation method

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe in detail the disclosed implementation manners of the present invention in conjunction with the accompanying drawings.

[0039] The embodiment of this application discloses a forming method for a low-density corrugated carbon honeycomb, including:

[0040] (1) Prepreg layup

[0041] The low-density corrugation of the present invention uses carbon fiber unidirectional prepreg to be laid on the inner mold curved surface. If there are many layers, the prepreg can be first laid into a flat prepreg stack according to the designed layup method, and then laid on the mold surface of the inner mold. For products with larger sizes, prepreg splicing is allowed.

[0042] In this embodiment, the single-layer thickness of the carbon fiber unidirectional prepreg is 0.04 mm, and the number of layup layers is 2 layers.

[0043] (2) Curing

[0044] In the present invention, the curing method of the corrugated carbon honeycomb is an improved soft mold pressure transfer molding process. The upper mold / lower mold is an assembly of two materials. The lower mold is a laying mold made of aluminum alloy, and the upper mold is a flexible pressure transfer mold with a silicone rubber inner surface. The inner surfaces of the upper mold and the lower mold are fitted to the carbon fiber prepreg laminate. Curing can be carried out in an oven or an autoclave. During the curing process, as the temperature rises, the prepreg will be subjected to the pressure generated by the thermal expansion of the metal of the upper mold, the lower mold and the non-metallic materials on the bonding surface, promoting the resin flow and thus obtaining a uniform and dense low-density carbon fiber corrugated strip blank.

[0045] As Figure 1 and Figure 2 shown, the height of the corrugated carbon honeycomb core is 25 mm (suitable for the preparation of carbon honeycombs with a height of 15 mm to 100 mm). The single-layer corrugated strip 1 is a carbon fiber laminated structure. The carbon fiber corrugated strip blank is formed by using a rigid laying mold and a flexible rubber pressure transfer soft mold through the vacuum bag-autoclave method, and the carbon fiber corrugated strip blank is processed to obtain the single-layer corrugated strip 1. Multiple single-layer corrugated strips 1 are adhesively bonded to obtain Figure 1 the (2) corrugated carbon honeycomb in Figure 1 and the (3) in

[0046] is the honeycomb three-dimensional morphology of the corrugated carbon honeycomb. Among them, the single-layer corrugated strip 1 includes a bonding surface and a non-bonding surface. The bonding surface includes a plurality of first-side bonding surfaces and a plurality of second-side bonding surfaces. The plurality of first-side bonding surfaces are coplanar, and the plurality of second-side bonding surfaces are coplanar. The first-side bonding surface and the second-side bonding surface are parallel and non-coplanar, and are connected by a non-bonding surface between the end of an adjacent first-side bonding surface and the end of a second-side bonding surface. The angle between the bonding surface and the non-bonding surfaces at both ends of itself is 120°. Therefore, the bonding surfaces of multiple single-layer corrugated strips are adhesively bonded in sequence to form a corrugated carbon honeycomb with a plurality of hexagonal holes.

[0047] (3) Processing

[0048] After the carbon fiber corrugated strip blank is formed, it needs to be processed to ensure the part size. However, since the thickness of the corrugated strip in this application is very small, conventional mechanical contact processing is likely to cause damage to the corrugated strip. In the present invention, non-contact pulsed laser ablation is used to complete the processing of the outer shape size and ventilation holes of the carbon fiber corrugated strip blank. The special clamping tooling as Figure 3 shown is used to fix the thin-walled corrugated strip, and the pulsed laser with specific processing parameters is used to complete the processing of the thin carbon fiber corrugated strip blank, obtaining a low-density corrugated strip with breathable micropores and a certain accuracy grade.

[0049] As Figure 2As shown, it is a dimension schematic of the carbon fiber corrugated strip blank. Through non-contact pulsed laser ablation processing, the processing of the thin-walled and weakly rigid carbon fiber laminated structure is completed. Before processing, use Figure 3 the dedicated clamping tooling shown to fix the carbon fiber corrugated strip blank. While flattening the carbon fiber corrugated strip blank, it is ensured that the processing dimensions of the product do not change due to the movement of the blank during cutting in the processing process. As Figure 3 shown, the clamping tooling includes a pressing plate 3 and a processing platform. A plurality of mutually parallel processing grooves 31 are provided on the pressing plate 3. The processing grooves 31 are perpendicular to the length direction of the concave position of the carbon fiber corrugated strip blank 2. A plurality of pressing teeth are provided on one side of the pressing plate 3, and the pressing teeth cooperate with the concave position of the carbon fiber corrugated strip blank 2. Place the carbon fiber corrugated strip blank 2 on the surface of the processing platform, make the processing grooves of the pressing plate 3 perpendicular to the length direction (i.e., Figure 2 the width direction in

[0050] the width direction) of the concave position of the carbon fiber corrugated strip blank 2, and make the side of the pressing plate 3 with pressing teeth face the concave position of the carbon fiber corrugated strip blank 2. Then press the pressing plate 3 above the carbon fiber corrugated strip blank 2 and fix the pressing plate 3 and the processing platform through bolts to complete the clamping.

[0051] Table 1 Processing Parameters

[0052]

[0053] Specifically, the processing process after clamping includes:

[0054] Hole making, the breathable holes 21 are processed at the non-bonding surface position of the carbon fiber corrugated strip blank 2 using the pulsed laser ablation processing parameters shown in Table 1.

[0055] Pretreatment, according to the height of the single-layer corrugated strip 1, the pretreatment cutting parameters in Table 1 are used to perform pretreatment cutting on the carbon fiber corrugated strip blank 2. When the pretreatment cutting is carried out, when cutting to 80% of the thickness of the carbon fiber corrugated strip blank 2, one pretreatment cutting is completed. Each pretreatment cutting can only process a certain size along the wavelength direction, so in the entire wavelength direction of the carbon fiber corrugated strip blank, multiple pretreatment cuttings need to be carried out in sequence.

[0056] Seam processing: The part between two adjacent pre-treatment cuts is the seam. The length of the seam between two adjacent pre-treatment cut seams is generally 1 - 2 mm. For the seam position, the seam processing parameters in Table 1 are used for processing. (Constrained by the size of the laser processing image, it is impossible to cut a too long line at one time, so the zoning processing method is adopted to process each area one by one, and there are seams between areas. What is described here is the ablation processing for the seam).

[0057] Post-treatment: Using the post-treatment cutting parameters in Table 1, at the same position as the pre-treatment processing, along the wavelength direction of the carbon fiber corrugated strip blank, multiple post-treatments are carried out in sequence to cut off the remaining thickness of the carbon fiber corrugated strip blank, and a single-layer corrugated strip with the target height is obtained.

[0058] Through the above processing process, by using high-frequency short-wavelength laser combined with low-speed scanning to control the heat-affected area during the main body cutting, and combining low-frequency high-speed scanning to achieve rapid cutting, the problem that the weak-rigidity corrugated strip is prone to curl during the cutting process, resulting in the occlusion of the optical path in the post-processing area, is solved, and the processing accuracy and dimensional consistency of a single-piece corrugated strip are ensured.

[0059] (4) Gluing

[0060] After obtaining the single-layer corrugated strip, multiple single-layer corrugated strips must be glued together to form a low-density corrugated carbon honeycomb. Use a special pressurized gluing tooling as shown in Figure 4 the figure.

[0061] As shown in Figure 4 , Figure 5 and Figure 6 the figure, the gluing tooling includes a gluing base 41, a movable pressing strip 42, a fixed pressing strip 43 and a baffle 44. The fixed pressing strip 43 is fixedly connected to the working surface of the gluing base 41. The fixed pressing strip 43 includes a plurality of fixing columns perpendicular to the working surface. The plurality of fixing columns are arranged in sequence along a straight line direction. Each fixing column is used to contact the back of the gluing surface of the single-layer corrugated strip 1, as shown in Figure 5 a; The movable pressing strip 42 is slidably connected to the working surface of the gluing base 41. On the side of the movable pressing strip 42 facing the fixed pressing strip 43, a plurality of protruding strips are provided. Each protruding strip corresponds to a fixing column one by one, and the protruding strip is used to contact the back of the gluing surface of another single-layer corrugated strip 1; The baffle 44 is fixedly connected to one end of the movable pressing strip 42 far from the working surface of the gluing base 41, and is used to limit the single-layer corrugated strip 1; A driving screw is threadedly connected to the gluing base 41. The axis of the driving screw is parallel to the moving direction of the movable pressing strip 42. The driving screw is located on the side of the movable pressing strip 42 facing away from the fixed pressing strip 43, and the end of the driving screw contacts the movable pressing strip 42 to drive the movable pressing strip 42 to move.

[0062] The process of bonding the corrugated strips into a carbon honeycomb is as shown in Figure 5As shown. The two single-layer corrugated strips 1 to be bonded are the first corrugated strip 51 and the second corrugated strip 52 respectively. Make the back of the bonding surface of the first corrugated strip 51 contact the fixing posts of the fixed pressing strip 43 one by one, and make the back of the bonding surface of the second corrugated strip 52 contact the convex strips of the movable pressing strip 42 one by one. Then control the movement of the movable pressing strip 42. The movable pressing strip 42 drives the second corrugated strip 52 to move towards the first corrugated strip 51 until the bonding between the first corrugated strip 51 and the second corrugated strip 52 is completed. Multiple single-layer corrugated strips 1 are bonded in sequence to form a carbon fiber honeycomb 53. The fixing posts of the fixed pressing strip 43 can be inserted into the honeycombs of the carbon fiber honeycomb 53 so that the carbon fiber honeycomb 53 can continue to be bonded with the single-layer corrugated strip 1. As Figure 5 b and Figure 5 c shown.

[0063] Align and bond the single-layer corrugated strips 1 one by one to form a three-dimensional low-density corrugated carbon honeycomb. The bonding tooling mainly uses the columns arranged in the same period as the corrugated strips to realize the clamping and fixing of the corrugated strips, uses the channels with matching precision and the "T"-shaped grooves to realize the precise alignment of the fixed end and the moving end of the tooling, and finally uses the pressure screw to apply pressure to the moving end to complete the pressure application during the bonding process of the corrugated strips at the fixed end and the moving end. Repeat the above steps, bond the corrugated strips one by one, and finally realize the preparation of the corrugated carbon honeycomb with the target size.

[0064] Through the above-mentioned pressure bonding tooling, multiple bonding surfaces can be pressurized simultaneously, and the bonding quality is high.

[0065] In this patent, by reducing the single-layer thickness and the number of laying layers of the carbon fiber unidirectional prepreg, a prepreg with a thinner laying thickness is obtained. However, due to the smaller thickness, it is impossible to use a traditional rigid mold for curing, but through an improved soft mold pressure transfer molding process for curing and forming, a uniform and dense low-density corrugated strip with a thickness of 0.08 mm is obtained. Then, through the processing method of this patent, the thinner carbon fiber corrugated strip blank is not easily deformed during the processing, ensuring the processing accuracy of the single-layer corrugated strip; finally, multiple single-layer corrugated strips are uniformly and simultaneously pressurized through the pressure bonding tooling, ensuring the bonding quality and efficiency.

[0066] The content not described in detail in the specification of this application belongs to the well-known technology of those skilled in the art.

[0067] The above has described this application in detail in combination with specific embodiments and exemplary examples, but these descriptions should not be construed as limiting this application. Those skilled in the art understand that without departing from the spirit and scope of this application, various equivalent replacements, modifications or improvements can be made to the technical solutions of this application and their implementation manners, and these all fall within the scope of this application. The protection scope of this application is subject to the appended claims.

Claims

1. A method for forming a low-density corrugated carbon honeycomb, characterized in that: include: Using carbon fiber unidirectional prepreg plies to obtain a carbon fiber prepreg stack; The carbon fiber prepreg stack is fitted to the inner surfaces of an upper mold and a lower mold, wherein the lower mold is a layering mold made of aluminum alloy, and the upper mold is a flexible pressure transfer mold with a silicone rubber material on the inner side, and then the upper mold, the carbon fiber prepreg stack and the lower mold are integrally cured to obtain a carbon fiber corrugated strip blank (2); The carbon fiber corrugated strip blank (2) is processed by non-contact pulsed laser ablation to obtain a single-layer corrugated strip (1); The single-layer corrugated strips (1) are glued together to obtain a corrugated carbon honeycomb.

2. The method for forming a low-density corrugated carbon honeycomb according to claim 1, characterized in that: When the carbon fiber unidirectional prepreg is used for plying, the single layer thickness of the carbon fiber unidirectional prepreg is 0.03-0.08 mm, and the number of plies is 2-4.

3. The method for forming a low-density corrugated carbon honeycomb according to claim 1, characterized in that: The method of processing the carbon fiber corrugated strip blank (2) by non-contact pulsed laser ablation comprises: Hole making: making air holes (21) on the non-bonded surface of the carbon fiber corrugated strip blank (2); Pre-treatment, cutting is performed on the carbon fiber corrugated strip blank (2) according to the height of the single-layer corrugated strip (1), and when the cutting reaches 80% to 90% of the thickness of the carbon fiber corrugated strip blank (2), the pre-treatment cutting is completed once; then, multiple pre-treatment cuttings are performed in sequence along the wavelength direction of the carbon fiber corrugated strip blank (2) until the pre-treatment cutting in the wavelength direction of the carbon fiber corrugated strip blank (2) is completed; Seam processing: the portion between two adjacent pre-processing cuts is the seam, and the seam is cut and processed. The processing depth of the seam is consistent with the processing depth of the cut seam obtained by the pre-processing cut; Post-processing is performed multiple times in sequence along the wavelength direction of the carbon fiber corrugated strip blank (2), and the remaining thickness of the carbon fiber corrugated strip blank (2) is cut off to obtain a single-layer corrugated strip (1).

4. The method for forming a low-density corrugated carbon honeycomb according to claim 3, characterized in that: The hole-making processing laser parameters are a pulse width of 95 to 105 ns, a scanning speed of 95 to 105 mm / s, and 10 scan times; the pre-processing cutting parameters are a pulse width of 95 to 105 ns, a scanning speed of 95 to 105 mm / s, and 50 scan times; the seam processing laser parameters are a pulse width of 195 to 205 ns, a scanning speed of 290 to 310 mm / s, and 40 scan times; and the post-processing laser parameters are a pulse width of 55 to 65 ns, a scanning speed of 195 to 205 mm / s, and 10 scan times.

5. The method for forming a low-density corrugated carbon honeycomb according to claim 1, characterized in that: Before the carbon fiber corrugated strip blank (2) is processed by non-contact pulse laser ablation, the carbon fiber corrugated strip blank (2) is first clamped and fixed using a clamping tool; The clamping tool comprises a pressing plate (3), on which a plurality of mutually parallel processing grooves (31) are provided, the processing grooves (31) are perpendicular to the length direction of the recessed position of the carbon fiber corrugated strip blank (2), and a plurality of pressing teeth are provided on one side of the pressing plate (3), the pressing teeth cooperate with the recessed position of the carbon fiber corrugated strip blank (2).

6. The method for forming a low-density corrugated carbon honeycomb according to claim 5, characterized in that: The method of using a clamping tool to clamp and fix the carbon fiber corrugated strip blank (2) comprises: aligning the processing groove (31) of the pressing plate (3) perpendicularly to the length direction of the recessed position of the carbon fiber corrugated strip blank (2), and aligning the side of the pressing plate (3) with the pressing teeth to face the recessed position of the carbon fiber corrugated strip blank (2), and then pressing the pressing plate (3) onto the top of the carbon fiber corrugated strip blank (2), and the clamping is completed.

7. The method for forming a low-density corrugated carbon honeycomb according to claim 1, characterized in that: When the single-layer corrugated strip (1) is glued, a pressurized glue tool is used for gluing. The pressurized glue tool includes a glue base (41), a movable pressure strip (42) and a fixed pressure strip (43). The fixed pressure strip (43) is fixedly connected to the working surface of the glue base (41). The fixed pressure strip (43) includes a plurality of fixed columns perpendicular to the working surface. The plurality of fixed columns are arranged in sequence along a straight line direction. Each fixed column is used to contact the back side of the gluing surface of the single-layer corrugated strip 1. The movable pressure strip (42) is slidably connected to the working surface of the glue base (41). A plurality of convex strips are provided on one side of the movable pressure strip (42) facing the fixed pressure strip (43). Each convex strip corresponds to a fixed column one by one. The convex strip is used to contact the back side of the gluing surface of another single-layer corrugated strip 1.

8. The method for forming a low-density corrugated carbon honeycomb according to claim 7, characterized in that: One end of the movable pressure strip (42) away from the working surface of the adhesive base (41) is fixedly connected with a blocking piece (44), and the blocking piece (44) is used to limit the position of the single-layer corrugated strip 1.

9. The method for forming a low-density corrugated carbon honeycomb according to claim 7, characterized in that: A driving screw (45) is threadedly connected to the adhesive base (41), the axis of the driving screw is parallel to the moving direction of the movable pressure strip (42), the driving screw is located on the side of the movable pressure strip (42) away from the fixed pressure strip (43), and the end of the driving screw is in contact with the movable pressure strip (42) for driving the movable pressure strip (42) to move.

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