Thin-wall metal honeycomb core machining method and device

Abstract

The invention belongs to the technical field of honeycomb plate machining, and discloses a thin-wall metal honeycomb core machining method and device. The preparation process comprises the steps of metal sheet forming and corrugated board assembling. Firstly, a metal sheet is placed between forming dies, the section of each forming die is of a wave structure, and concave pit structures and convex structures are machined on the different sections of each forming die. And the forming upper die is driven to move downwards to bend the metal sheet, and two kinds of child-mother riveting structures with different sizes are machined on the to-be-connected face of the corrugated board through corresponding concave pits and convex structures on the surface of the forming die. Two corrugated boards are machined through a forming die, the primary and secondary riveting structures prefabricated on the to-be-connected faces of the corrugated boards can be sleeved with each other, the corrugated boards can be spliced and assembled, the assembled corrugated boards are connected and punched, the primary and secondary riveting structures which are sleeved with each other generate plastic deformation under the pressure effect, the neck thickness value is increased, and the primary and secondary riveting structures extrude each other; the two corrugated board materials are mutually embedded to form an interlocking structure, and the steps are repeated to complete manufacturing of the honeycomb core.

Description

Technical Field

[0001] The invention belongs to the technical field of honeycomb panel processing, and in particular relates to a method and a device for processing a thin-walled metal honeycomb core. Background Art

[0002] With the development of aviation, aerospace, automobiles, etc., the requirements for material performance are getting higher and higher, and the requirements for structural weight performance are becoming more and more sensitive. Honeycomb panels are widely used due to their advantages such as light weight, sound insulation, heat insulation, and impact resistance. The honeycomb sandwich structure on the current market is composed of two thinner panels and a thick and light honeycomb core in the middle. The honeycomb core is the core component of the honeycomb sandwich structure. The performance of the honeycomb core directly affects the performance of the honeycomb sandwich structure. The molding method for processing the honeycomb core is to roll or stamp the metal sheet into a semi-honeycomb core, that is, a corrugated board, and then connect the corrugated board into a honeycomb core by bonding or welding. The honeycomb core made by the bonding molding method has a relatively precise size, but the strength of the connected honeycomb core is not high. It cannot be used in an environment above 300°C, and the production efficiency is low. The corrugated board is connected into a honeycomb core by welding. The high temperature generated during the welding process will cause the local material properties of the corrugated board to change. The uneven heating of the corrugated board during welding will cause the corrugated board to warp, twist, and other deformations. In addition, the welding process requires professional equipment and technicians, and the process is complex and costly. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a thin-walled metal honeycomb core processing method and device, and proposes a new honeycomb core manufacturing method, which effectively avoids the defects caused by welding and gluing corrugated boards.

[0004] It can realize the processing and manufacturing of thin-walled metal honeycomb cores without adding auxiliary connection parts, has high connection strength and high production efficiency, meets the requirements of lightweight design, can prepare high-strength thin-walled honeycomb core materials, improve economy and production efficiency, and is suitable for large-scale automated production.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for processing a thin-walled metal honeycomb core includes two steps: metal sheet forming and corrugated sheet assembly:

[0007] S1. Processing a forming mold according to the structural dimensions of the metal honeycomb core, wherein the forming mold has two different cross sections, and the two different cross sections are alternately arranged at equal distances on the surface of the forming mold;

[0008] One of the sections is used to process the sub-riveted structure, and the other section is used to process the parent riveted structure;

[0009] The upper extrusion die and the lower extrusion die are processed according to the structural dimensions of the metal honeycomb core; a plurality of elastic pads are provided on one side of the upper extrusion die relative to the lower extrusion die;

[0010] S2, placing the metal sheet between the forming dies; driving the forming dies to move, causing the metal sheet to undergo plastic bending deformation, and preparing a plurality of sub-riveted structures and a plurality of mother-riveted structures on the surface of the metal sheet;

[0011] S3, assembling the two formed corrugated boards so that the sub-riveted structure fits with the main riveted structure, and then placing them between the upper extrusion die and the lower extrusion die;

[0012] The extrusion dies are driven to move toward each other, and the elastic pad first contacts the metal sheet to play a role of edge pressing; with further extrusion, the prefabricated sub-riveted structure and the mother riveted structure that fit between the corrugated sheets undergo plastic deformation, radial expansion to form interlocking, and the corrugated sheet connection process is completed to obtain a formed splicing structure;

[0013] S4, connecting the third corrugated board to the formed splicing structure of S3, and using the upper extrusion die and the lower extrusion die to extrude, so as to complete the interlocking;

[0014] And add corrugated sheets one by one and splice them to realize the preparation of thin-wall honeycomb core.

[0015] The present invention also discloses a thin-wall metal honeycomb core processing device for realizing the processing method, comprising a forming die and an extrusion die;

[0016] The cross section of the forming mold is an isosceles trapezoidal wave structure, and the forming mold has two different cross sections, which are alternately arranged at equal distances on the surface of the forming mold;

[0017] The forming die comprises an upper forming die and a lower forming die;

[0018] The first cross section is used to process a sub-riveting structure on a metal part, specifically: a first concave structure is prefabricated on the molding surface of the upper molding die, and a first convex structure is prefabricated on the molding surface of the lower molding die, and the first concave structure is opposite to the first convex structure;

[0019] The second cross section is used to process a female rivet structure on a metal part, specifically: a second convex structure is prefabricated on the molding surface of the upper molding die, a second concave structure is prefabricated on the molding surface of the lower molding die, and the second convex structure is opposite to the second concave structure;

[0020] The sub-riveting structure and the main riveting structure can be nested;

[0021] The extrusion die comprises an upper extrusion die and a lower extrusion die, and elastic pads are arranged on opposite sides of the upper extrusion die and the lower extrusion die;

[0022] The extrusion die has two different cross sections, which are alternately arranged at equal intervals on the surface of the forming die; the two different cross sections are used to adapt to the different cross sections of the two corrugated boards formed by the forming die.

[0023] Furthermore, during extrusion molding, the elastic pad relative to the female riveting structure is prefabricated as a gasket with a through hole, the through hole is arranged to correspond to the position of the female riveting structure, and the diameter of the through hole is 1.5 times the diameter of the female riveting structure.

[0024] Furthermore, the cross section of the first concave structure or the second concave structure is M-shaped, and the cross section of the first convex structure or the second convex structure is n-shaped.

[0025] Furthermore, the end faces of the relative concave and convex structures are prefabricated with relative top cones, so that the ends of the sub-riveted structures and the mother riveted structures on the surface of the metal sheet to be connected have a distribution feature of being thin in the middle and thick at the edges.

[0026] Furthermore, the minimum thickness e of the middle region between the ends of the sub-riveted structure and the female riveted structure is 0.5 times the thickness of the metal sheet.

[0027] Furthermore, the diameters of the first concave structure, the first convex structure, the second concave structure, and the second convex structure are at least three times the thickness of the metal sheet.

[0028] Furthermore, the distance L between the sub-riveting structure and the female riveting structure on the surface of the corrugated board to be connected is greater than 3 times the diameter of the female riveting structure.

[0029] Furthermore, the inner diameter of the mother riveting structure is a, the outer diameter of the sub-riveting structure is b, the inner depth of the mother riveting structure is c, the height of the sub-riveting structure is d, and the thickness of the metal sheet is s, wherein a≥b≥3s, c≥d≥s, so that the sub-riveting structure and the mother riveting structure on the surfaces of the two metal sheets to be connected can be nested and assembled.

[0030] Furthermore, the elastic pad is polyurethane rubber.

[0031] Compared with the prior art, the present invention has the following beneficial technical effects:

[0032] The present invention discloses a method for processing a thin-walled metal honeycomb core, and the preparation process is divided into two steps: metal sheet forming and corrugated board assembly. The device includes a forming mold and an extrusion mold. First, the metal sheet is placed between the forming molds, and the corresponding surfaces of the upper and lower forming molds are processed with corresponding pits and convex structures. Under the drive of the press, the upper forming mold moves downward to complete the cold pressing and bending of the semi-honeycomb core, i.e., the corrugated board, and at the same time, concave and convex structures are processed on the surface of the corrugated board to be connected. The two pieces of corrugated board are matched and combined for connection and stamping. Under the action of pressure, the concave and convex structures are plastically deformed and squeezed against each other, and the two corrugated board materials are inlaid with each other to form an interlocking structure. The honeycomb core is manufactured by repeating the above steps.

[0033] Compared with welding, the processing method of the thin-walled metal honeycomb core disclosed in the present invention has a lower forming temperature, less impact on material properties, and is not restricted in application environment compared with gluing, and has a fast processing speed. The production equipment of the present invention is relatively simple, the cost is low, and the connection speed is fast. In the process of mass production, fast connection can be achieved, reducing production time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the local structure of the corrugated board;

[0035] Figure 2 It is a cross-sectional view of the corrugated board structure;

[0036] Figure 3 Schematic diagrams of different cross-sectional structures of the forming mold; wherein, Figure a is a schematic diagram of the first cross-sectional structure, and Figure b is a schematic diagram of the second cross-sectional structure;

[0037] Figure 4 This is a partial enlarged view of the prefabricated riveted structure;

[0038] Figure 5 This is the principle diagram of corrugated board splicing;

[0039] Figure 6 Schematic diagrams of different cross-sectional structures of extrusion dies; among them, Figure a is a schematic diagram of the first cross-sectional structure, and Figure b is a schematic diagram of the second cross-sectional structure;

[0040] Figure 7 This is a schematic diagram of the compression deformation of the riveted structure;

[0041] Figure 8 This is a schematic diagram of corrugated board connection;

[0042] Fig. 9 It is a schematic diagram of the honeycomb core made by the present invention.

[0043] In the figure: 1, forming upper die; 2, metal sheet; 3, forming lower die; 4, upper extrusion die; 5, elastic pad; 6, lower extrusion die;

[0044] 11. First concave structure; 31. First convex structure; 12. Second convex structure; 32. Second concave structure; 21. Sub-riveting structure; 22. Sub-riveting structure. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0046] The components described in the drawings and embodiments of the present invention may be arranged and designed in various configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0047] It should be noted that the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that a process, element, method, article or equipment that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or equipment.

[0048] like Figure 1 As shown, it is a schematic diagram of the local structure of the corrugated board produced after the first step of bending and forming of the present invention. This example is used to specifically explain a method for processing a thin-walled metal honeycomb core of the present invention. It does not constitute a limitation of the present invention. The method of the present invention can be implemented using any structure that can realize splicing, fitting and then extrusion between corrugated boards.

[0049] like Figure 3 , Figure 6 A set of specific devices for realizing a thin-walled metal honeycomb core processing method of the present invention does not constitute a limitation of the present invention. The method of the present invention can be realized by using any existing device that can realize its step-by-step functions.

[0050] The device comprises a forming die and an extrusion die. The forming die comprises an upper forming die 1 and a lower forming die 3, and the extrusion die comprises an upper extrusion die 4, a lower extrusion die 6 and an elastic pad 5.

[0051] The upper molding die 1 and the lower molding die 3 are both molds with a trapezoidal wave-shaped cross section, and corresponding surfaces of the upper molding die 1 and the lower molding die 3 are provided with pits and protrusion structures.

[0052] Specifically, Figure 3 As shown, the forming mold has two different cross sections, and the two different cross sections are alternately arranged at equal distances on the surface of the forming mold.

[0053] The first cross section Figure 3 As shown in Figure a, it is used to process a sub-riveting structure 21 on a metal part. The molding surface of the upper molding die 1 is prefabricated with a first pit structure 11, and the molding surface of the lower molding die 3 is prefabricated with a first convex structure 31. The first pit structure 11 on the upper molding die 1 is opposite to the first convex structure 31 on the lower molding die 3.

[0054] The second cross section Figure 3 As shown in Figure b, it is used to process a female rivet structure 22 on a metal part. The molding surface of the upper molding die 1 is prefabricated with a second protrusion structure 12, and the molding surface of the lower molding die 3 is prefabricated with a second pit structure 32. The second protrusion structure 12 on the upper molding die 1 is opposite to the second pit structure 32 on the lower molding die 3.

[0055] The corrugated board bent by the forming mold has the surface to be connected arranged with the sub-riveting structures 21 and the mother riveting structures 22 alternately and equidistantly. Figure 1 shown.

[0056] Figure 4 The figure shows a cross-sectional view of the first concave structure 11 on the surface of the upper mold 1 and the first convex structure 31 on the surface of the lower mold 3. Preferably, the first concave structure 11 on the surface of the upper mold 1 and the corresponding first convex structure 31 on the surface of the lower mold 3 are prefabricated with conical end faces with opposite tops, and the second concave structure 32 and the corresponding second convex structure 12 end faces are also prefabricated with conical shapes with opposite tops. Finally, the sub-riveting structure 21 and the mother rivet structure 22 with the distribution characteristics of thin middle and thick edges at the ends can be processed on the corrugated board.

[0057] The minimum thickness e of the middle region between the ends of the sub-riveted structure 21 and the female riveted structure 22 is 0.5 times the thickness of the metal sheet 2 .

[0058] Similarly, the matching structure of the second concave structure 32 and the second convex structure 12 is Figure 4 same.

[0059] like Figure 6 As shown, the extrusion die designed by the present invention includes an upper extrusion die 4 and a lower extrusion die 6, and an elastic pad 5 is fixed on the surface of the upper extrusion die 4 and the lower extrusion die 6. The upper extrusion die 4 and the lower extrusion die 6 are both trapezoidal structures, which are compatible with the trapezoidal groove structure in the corrugated board processed by the aforementioned forming die.

[0060] Specifically, the extrusion die also has two different cross sections, and the two different cross sections are alternately arranged at equal distances on the surface of the extrusion die.

[0061] The first cross section Figure 6 As shown in Figure a, in this section, the elastic pad 5 on the upper extrusion die 4 is a gasket with a through hole, wherein the through hole provided on the elastic pad 5 corresponds to the position of the female rivet structure 22, and the diameter of the through hole is 1.5 times the diameter of the female rivet structure 22. The female rivet structure 22 is placed toward the upper extrusion die 4.

[0062] The second cross section Figure 6As shown in Figure b, in this section, the elastic pad 5 on the lower extrusion die 6 is a gasket with a through hole, wherein the through hole provided on the elastic pad 5 corresponds to the position of the female rivet structure 22, and the diameter of the through hole is 1.5 times the diameter of the female rivet structure 22. The female rivet structure 22 is placed toward the lower extrusion die 6.

[0063] In a preferred embodiment of the present invention, the extrusion die is a trapezoidal structure with rounded corners and the same size as the inner wall of the corrugated board, which can prevent the corrugated board from warping due to plastic deformation of the concave and convex structure during punching and connection.

[0064] like Figure 5 As shown, after one of the corrugated boards made by the forming mold is rotated, the sub-riveting structures 21 and the female riveting structures 22 of the two corrugated boards made by the forming mold are superimposed together.

[0065] like Figure 7 As shown, a load is applied to the upper extrusion die 4, the upper extrusion die 4 moves downward, and the elastic pad 5 is deformed by pressure; as the extrusion proceeds, the sub-riveted structure 21 and the female riveted structure 22 that fit together are deformed plastically by force, the neck thickness value increases, and a mechanical interlocking structure is formed, so as to achieve the following Figure 8 Corrugated sheet connections shown.

[0066] In a preferred embodiment of the present invention, the elastic pad 5 provided on the extrusion die is polyurethane rubber, and the surfaces of the upper extrusion die 4 and the lower extrusion die 6 are both provided with polyurethane rubber, which can play a role in pressing the edge of the corrugated board when the concave and convex structure of the corrugated board is subjected to force and produces plastic deformation.

[0067] The present invention discloses a method for processing a thin-walled metal honeycomb core, and the specific steps are as follows:

[0068] S1. According to the structural dimensions of the metal honeycomb core, an upper molding die 1 with a concave and convex structure, a lower molding die 3, an upper extrusion die 4 with an elastic pad 5, and a lower extrusion die 6 are designed and processed;

[0069] S2, such as Figure 3 As shown, a metal sheet 2 is placed between an upper forming mold 1 and a lower forming mold 3; a press drives the upper forming mold 1 to move, and the metal sheet 2 is plastically deformed and folded into a corrugated board. At the same time, the pits and protrusions provided on the surfaces of the forming mold 1 and the lower forming mold 3 punch out alternatingly arranged sub-riveting structures 21 and mother rivet structures 22 on the surface of the corrugated board to be connected.

[0070] S3, as Figure 5In the method shown, the formed corrugated sheet, i.e., the metal sheet 2, is spliced ​​and nested, and placed in an extrusion die; the press drives the extrusion die to move toward each other, and the elastic pad 5 contacts the metal sheet 2 to generate a clamping force; with further extrusion, the nested parent-child riveted structure undergoes plastic deformation, radially expands to form an interlock, and the connection process of the two corrugated sheets is completed;

[0071] S4, connecting the third corrugated board to the formed splicing structure of S3, using the upper extrusion die 4 and the lower extrusion die 6 to extrude and complete interlocking; and adding corrugated boards one by one and splicing them to realize the preparation of thin-wall honeycomb core.

[0072] In a preferred embodiment of the present invention, the concave and convex structures provided on the surface of the molding die correspond to each other, wherein the cross section of the first concave structure 11 or the second concave structure 32 is "M" shaped, and the cross section of the first convex structure 31 or the second convex structure 12 is "n" shaped.

[0073] In a preferred embodiment of the present invention, Figure 2 As shown, the inner diameter of the mother riveted structure 22 of the manufactured corrugated board is a=4.6mm, and the depth is c=1mm; the outer diameter of the sub-riveted structure 21 is b=4.6mm, and the height is d=1mm; the thickness of the metal sheet is s=0.3mm, and the distance between adjacent sub-riveted structures 21 and mother riveted structures 22 is L=5mm.

[0074] Specific application cases:

[0075] The thickness of the metal sheet 2 is 0.3mm and the width is 48mm. The upper forming mold 1 and the lower forming mold 3 are corrugated board molds with a width of 48mm corresponding to the pits and protrusions. The pits and protrusions on the surface are arranged alternately and equidistantly. The first pit structure 11 has a diameter of 5.2mm and a depth of 1mm, and a cone with a height of 0.1mm is provided at its bottom. The first protrusion structure 31 has a diameter of 4.6mm and a height of 1.1mm, and a cone with a height of 0.075mm is provided at its end; the second pit structure 32 has a diameter of 4.6mm and a depth of 1mm, and a cone with a height of 0.075mm is provided at its bottom; the second protrusion structure 12 has a diameter of 4mm and a height of 1.1mm, and a cone with a height of 0.1mm is provided at its end. The mother-and-child riveting structure made on the surface to be connected of the corrugated board is thin in the middle and thick on both sides, and the thickness e of the middle area of ​​the end is 0.15mm. Figure 4 As shown. The corrugated board obtained after forming can be spliced. After splicing, the mother-and-child riveted structures on the surface of the corrugated board are nested with each other, and after being stamped and connected, a mechanical interlocking structure is formed to produce the following Fig. 9 The shown honeycomb core has a regular hexagonal shape with a height of 48 mm and a side length of 16 mm.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for processing a thin-walled metal honeycomb core, characterized in that: It includes two processes: sheet metal forming and corrugated board assembly: S1. Processing a forming mold according to the structural dimensions of the metal honeycomb core, wherein the forming mold has two different cross sections, and the two different cross sections are alternately arranged at equal distances on the surface of the forming mold; One of the cross sections is used for processing a sub-riveted structure (21), and the other cross section is used for processing a main riveted structure (22); An upper extrusion die (4) and a lower extrusion die (6) are processed according to the structural dimensions of the metal honeycomb core; a plurality of elastic pads (5) are provided on one side of the upper extrusion die (4) opposite to the lower extrusion die (6); S2, placing the metal sheet (2) between the forming dies; driving the forming dies to move, causing the metal sheet (2) to undergo plastic bending deformation, and preparing a plurality of sub-riveted structures (21) and a plurality of main riveted structures (22) on the surface of the metal sheet (2); S3, assembling the two formed corrugated boards so that the sub-riveted structure (21) fits with the main riveted structure (22), and then placing them between the upper extrusion die (4) and the lower extrusion die (6); The extrusion dies are driven to move toward each other, and the elastic pad (5) first contacts the metal sheet (2) to play a role of edge pressing; with further extrusion, the prefabricated sub-riveted structure (21) and the mother riveted structure (22) that fit between the corrugated sheets undergo plastic deformation, expand radially to form interlocking, and the corrugated sheet connection process is completed to obtain a formed splicing structure; S4, connecting the third corrugated board to the formed splicing structure in S3, and using the upper extrusion die (4) and the lower extrusion die (6) to extrude and complete interlocking; And add corrugated sheets one by one and splice them to realize the preparation of thin-wall honeycomb core.

2. A thin-walled metal honeycomb core processing device for implementing the processing method described in claim 1, characterized in that: Including forming dies and extrusion dies; The cross section of the forming mold is an isosceles trapezoidal wave structure, and the forming mold has two different cross sections, which are alternately arranged at equal distances on the surface of the forming mold; The molding die comprises an upper molding die (1) and a lower molding die (3); The first cross section is used to process a sub-riveting structure (21) on a metal part, specifically: a first concave structure (11) is prefabricated on the molding surface of the upper molding die (1), and a first convex structure (31) is prefabricated on the molding surface of the lower molding die (3), and the first concave structure (11) is opposite to the first convex structure (31); The second cross section is used to process a female rivet structure (22) on a metal part, specifically: a second protrusion structure (12) is prefabricated on the molding surface of the upper molding die (1), a second recess structure (32) is prefabricated on the molding surface of the lower molding die (3), and the second protrusion structure (12) is opposite to the second recess structure (32); The sub-riveting structure (21) and the main riveting structure (22) can be nested; The extrusion die comprises an upper extrusion die (4) and a lower extrusion die (5), and elastic pads (5) are provided on opposite sides of the upper extrusion die (4) and the lower extrusion die (6); The extrusion die has two different cross sections, which are alternately arranged at equal intervals on the surface of the forming die; the two different cross sections are used to adapt to the different cross sections of the two corrugated boards formed by the forming die.

3. A thin-walled metal honeycomb core processing device according to claim 2, characterized in that: During extrusion molding, the elastic pad (5) relative to the female riveting structure (22) is prefabricated as a gasket with a through hole, the through hole is arranged to correspond to the position of the female riveting structure (22), and the diameter of the through hole is 1.5 times the diameter of the female riveting structure (22).

4. A thin-walled metal honeycomb core processing device according to claim 2, characterized in that: The cross section of the first concave structure (11) or the second concave structure (32) is M-shaped, and the cross section of the first convex structure (31) or the second convex structure (12) is n-shaped.

5. A thin-walled metal honeycomb core processing device according to claim 4, characterized in that: The end faces of the relative concave and convex structures are prefabricated with relative top cones, so that the ends of the sub-riveted structures (21) and the mother riveted structures (22) on the surfaces of the metal sheets (2) to be connected have a distribution feature of being thin in the middle and thick at the edges.

6. A thin-walled metal honeycomb core processing device according to claim 5, characterized in that: The minimum thickness e of the middle area between the ends of the sub-riveted structure (21) and the female riveted structure (22) is 0.5 times the thickness of the metal sheet.

7. A thin-walled metal honeycomb core processing device according to claim 2, characterized in that: The structural diameters of the first concave structure (11), the first convex structure (31), the second concave structure (32), and the second convex structure (12) are at least three times the thickness of the metal sheet (2).

8. A thin-walled metal honeycomb core processing device according to claim 2, characterized in that: The distance L between the sub-riveting structure (21) and the main riveting structure (22) on the surface of the corrugated board to be connected is greater than 3 times the diameter of the main riveting structure (22).

9. A thin-walled metal honeycomb core processing device according to claim 2, characterized in that: The inner diameter of the mother riveting structure (22) is a, the outer diameter of the sub-riveting structure (21) is b, the inner depth of the mother riveting structure (22) is c, the height of the sub-riveting structure (21) is d, and the thickness of the metal sheet is s, wherein a≥b≥3s, c≥d≥s, so that the sub-riveting structure (21) and the mother riveting structure (22) on the surfaces to be connected of the two metal sheets (2) can be nested and assembled.

10. A thin-walled metal honeycomb core processing device according to claim 2, characterized in that: The elastic pad (5) is polyurethane rubber.

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