阅读说明：本技术 一种内嵌式纬向增强型金属蜂窝结构及其制作方法 (Embedded latitudinal reinforced metal honeycomb structure and manufacturing method thereof ) 是由 闵小兵 于 2020-05-25 设计创作，主要内容包括：本发明涉及一种内嵌式纬向增强型金属蜂窝结构及其制作方法,包括蜂窝芯,所述蜂窝芯具有多根相互平行设置的梯形条,所述梯形条具有至少2个依次首尾相连的单元段,所述单元段由依次一体连接的第一底板、第一腰板、第二底板和第二腰板组成,所述第一腰板和第二腰板对称地分布于第二底板的两端；相邻梯形条的第一底板和第二底板固定连接,形成具有多个单元格的蜂窝芯；还包括内嵌板,所述内嵌板沿纬向延伸且与梯形条的宽度方向垂直,所述内嵌板嵌入在沿纬向依次排布的单元格内,所述沿纬向依次排布的单元格所对应的底板与内嵌板固定连接。本发明的蜂窝结构各向强度高。(The invention relates to an embedded weft-wise enhanced metal honeycomb structure and a manufacturing method thereof, wherein the embedded weft-wise enhanced metal honeycomb structure comprises a honeycomb core, wherein the honeycomb core is provided with a plurality of trapezoidal strips which are arranged in parallel, each trapezoidal strip is provided with at least 2 unit sections which are sequentially connected end to end, each unit section consists of a first bottom plate, a first waist plate, a second bottom plate and a second waist plate which are sequentially and integrally connected, and the first waist plates and the second waist plates are symmetrically distributed at two ends of the second bottom plate; the first bottom plate and the second bottom plate of the adjacent trapezoid strips are fixedly connected to form a honeycomb core with a plurality of unit cells; still include interior panel, interior panel extends and is perpendicular with the width direction of trapezoidal strip along the latitudinal direction, interior panel embedding is in the cell of arranging in proper order along the latitudinal direction, bottom plate and interior panel fixed connection that the cell that arranges in proper order along the latitudinal direction corresponds. The honeycomb structure of the invention has high strength in each direction.)

1. The embedded weft-wise enhanced metal honeycomb structure comprises a honeycomb core (A), wherein the honeycomb core (A) is provided with a plurality of trapezoidal strips (1) which are arranged in parallel, each trapezoidal strip (1) extends along the warp direction, each trapezoidal strip (1) is provided with at least 2 unit sections (B) which are sequentially connected end to end, each unit section (B) consists of a first bottom plate (101), a first waist plate (102), a second bottom plate (103) and a second waist plate (104) which are sequentially and integrally connected, and the first waist plates (102) and the second waist plates (104) are symmetrically distributed at two ends of the second bottom plate (103); the first bottom plate (101) and the second bottom plate (103) of the adjacent trapezoid strips (1) are fixedly connected to form a honeycomb core (A) with a plurality of unit cells (C); the building block is characterized by further comprising at least 2 inner embedded plates (2), wherein the inner embedded plates (2) extend along the latitudinal direction and are perpendicular to the width direction of the trapezoidal strips; an interior panel (2) embedding is in a list cell (C) of arranging in proper order along the latitudinal direction, interior panel (2) many trapezoidal strip (1) of cross-over connection, bottom plate and interior panel (2) fixed connection that cell (C) of arranging in proper order along the latitudinal direction correspond, the installation side of interior panel (2) on the honeycomb core, the distance between the terminal surface of bottom plate and interior panel (2) fixed connection and the terminal surface of waist board is not less than the thickness of interior panel (2).

2. The embedded weft-wise reinforced metal honeycomb structure according to claim 1, wherein the bottom plate corresponding to the cells (C) sequentially arranged along the weft direction is provided with a bending part (106), and the bending part (6) is perpendicular to the bottom plate and extends towards the inner side of the cell to form an end face for fixedly connecting the inner panel (2).

3. The embedded weft-wise reinforced metal honeycomb structure according to claim 1, wherein the distance between the end face of the bottom plate corresponding to the unit cells (C) sequentially arranged along the weft direction and the end face of the inner panel (2) fixedly connected with the end face of the waist plate and the end face of the bottom plate corresponding to the inner panel (2) is equal to the thickness of the inner panel (2) on the installation side of the inner panel (2) on the honeycomb core.

4. The embedded weft-reinforced metal honeycomb structure according to claim 1, characterized in that the inner panels (2) are clearance-fitted with the cells (C) arranged in sequence along the weft direction.

5. The embedded latitudinal reinforced metal honeycomb structure of claim 4, wherein the inner panel (2) comprises a plurality of grid parts (201), the grid parts (201) are in clearance fit with the unit cells (C), adjacent grid parts (201) are integrally connected through neck parts (202), the neck parts (202) are fixedly connected with a bottom plate, and the latitudinal dimension of the neck parts (202) is not less than 2 times of the thickness of the trapezoidal strips.

6. The embedded weft-wise reinforced metal honeycomb structure according to claim 4, wherein bosses (105) abutted against the embedded plate are arranged on the waist plates corresponding to the unit cells (C) sequentially arranged along the weft direction.

7. The embedded weft-wise reinforced metal honeycomb structure according to any one of claims 1 to 6, characterized in that the number of the inner panels (2) is multiple, and the inner panels are arranged in the warp direction in sequence, and adjacent inner panels (2) are separated by N columns of cells (C), wherein N is a natural number.

8. The embedded weft-wise reinforced metal honeycomb structure according to any one of claims 1 to 6, characterized in that an inner panel (2) is arranged in each row of cells (C) which are sequentially arranged along the weft direction; preferably, 2 inner panels (2) are arranged in each row of the unit cells (C) which are sequentially arranged along the latitudinal direction, and the two ends of the unit cells (C) are oppositely distributed on the 2 inner panels (2).

9. The method for manufacturing the embedded weft-wise reinforced metal honeycomb structure according to any one of claims 1 to 8, comprising the following steps:

(1) providing a plate (5) with the same width and thickness as the target trapezoidal strip (1), and rolling and forming to obtain a trapezoidal strip blank (6);

(2) according to the position of the inner panel (2), processing a notch (107) for accommodating the inner panel (2) on the trapezoidal strip blank to obtain a trapezoidal strip (1);

(3) overlapping and welding a first bottom plate (101) and a second bottom plate (103) of every two trapezoid strips (1) to obtain a honeycomb core;

(4) and embedding an inner panel (2) into the honeycomb core, and welding to obtain the embedded weft-wise reinforced metal honeycomb structure.

10. The method of claim 9, wherein the step (2) further comprises the step of forming a boss (105) on the waist panel connected to the base panel.

Technical Field

The invention relates to an embedded weft-wise enhanced metal honeycomb structure and a manufacturing method thereof, and belongs to the field of composite plates/sectional materials.

Background

The honeycomb structure is the result of natural evolution, and the practical meaning of the honeycomb structure is that the strongest structure is obtained by using the least materials, and the characteristic meets the requirement of light weight materials in the engineering field. Nowadays, artificial honeycomb structures with honeycomb panels as the main development direction have been developed in great quantities. The structure has the excellent performances of energy absorption, shock absorption, sound insulation, heat insulation and the like besides light weight and high strength.

Chinese patent specification CN102774042A discloses a honeycomb reinforced plate and a manufacturing method thereof, wherein the manufacturing method of the honeycomb core material is as follows: firstly, cutting a metal plate into corresponding widths according to the height of the honeycomb core material; pressing the metal plates cut into the corresponding widths into isosceles trapezoids with the bottom surfaces as long as two waists and the bottom angles of 120 degrees to obtain trapezoid strips; then, welding every two isosceles trapezoid metal plates with the bottom surfaces equal to the two waist lengths and the bottom angles of 120 degrees together to finally form the required honeycomb core material. The honeycomb core thus obtained is an anisotropic material, and the shear strength and bending strength in the warp direction (in the direction in which the trapezoidal strips extend) are significantly superior to those in the weft direction. In engineering, in complex stress occasions and objects moving at high speed, the use of the anisotropic material brings safety hazards and causes limited application.

In addition, the honeycomb holes of the honeycomb core material have weak deformation resistance, and when the honeycomb core material is subjected to local strong impact stress, the honeycomb walls are easy to generate plastic deformation, so that the problems of distortion, tearing, damage and the like are caused.

The manufacture of metal honeycomb plate is mainly produced by cementing method at present. The convenience of the cementing method and the continuity of construction enable the metal honeycomb plate of the type to be produced with low cost. However, in some cases, such as the need for high temperature resistance, fire resistance, water resistance, etc., the use of the glued honeycomb panel is limited, and in addition, the strength of the glue is generally significantly lower than that of the welding, and thus the use of the glued honeycomb panel is also limited in the case of complicated stresses such as impact, bending, shearing, etc.

The basic idea for solving the problems is to replace bonding by welding, but the welding process is complex, needs to be operated at high temperature, accurately controls the temperature, needs to be positioned, supported and clamped at high temperature, and needs protective atmosphere or even vacuum condition for some processes, so that the existing welded metal honeycomb plates can not be continuously produced, and the manufacturing cost is high, thereby restricting the market application of the welded honeycomb plates. In the existing welded honeycomb plate, a honeycomb core is arranged between two metal plates to form a so-called sandwich structure. The honeycomb core and the metal plate are generally joined by brazing. The brazing is a metal connection method which has high technological requirements, and a special brazing furnace is needed for large-area brazing of large-sized plates, and vacuum or special protective atmosphere is also needed. In brazing of sheet materials, the usual criteria are: the welding area accounts for more than 95% of the welding area, and more than 80% of the welding area is basically qualified. In the brazing process of the honeycomb core and the metal plate, the contact area of the honeycomb core and the metal plate is less than 10% (generally 3-8%), namely, even if 100% of the contact area can be welded (the brazing difficulty of the honeycomb plate is far greater than that of a conventional plate), the welding area of the metal plate and the honeycomb core is less than 10%, so that the connection strength between the honeycomb core and the metal plate cannot reach an extremely high degree, and only 10% or less of the brazing strength of a common plate is required. This situation greatly affects the performance of the honeycomb panel, and thus, the production of a metal honeycomb panel by brazing is an inevitable solution. Moreover, in order to test the performance of the brazed honeycomb plate, an index of the "peel strength" of the bond between the metal plate and the honeycomb core was specifically proposed.

Disclosure of Invention

In view of the deficiencies of the prior art, an object of the present invention is to provide an embedded latitudinal reinforcement type metal honeycomb structure with a convergent structural strength; the second objective of the present invention is to provide a method for manufacturing an embedded weft-wise reinforced metal honeycomb structure.

Aiming at the difficulties, the invention develops an embedded weft-wise enhanced metal honeycomb structure which mainly comprises two components, wherein the components can be connected by a non-weight-increasing welding process, and particularly, the problems of positioning, supporting, clamping and the like at high temperature in the welding process can be better solved by the detailed design of the connecting parts of the two components. In addition, the method can abandon the (vacuum/atmosphere) furnace brazing process which is necessary to be adopted in the past, and creates conditions for continuous and automatic production of the welded metal honeycomb plate, thereby effectively reducing the production cost and expanding the application range.

In order to solve the technical problems, the technical scheme of the invention is as follows:

an embedded weft-wise enhanced metal honeycomb structure comprises a honeycomb core, wherein the honeycomb core is provided with a plurality of trapezoidal strips which are arranged in parallel, each trapezoidal strip extends along the warp direction, each trapezoidal strip is provided with at least 2 unit sections which are sequentially connected end to end, each unit section consists of a first bottom plate, a first waist plate, a second bottom plate and a second waist plate which are sequentially and integrally connected, and the first waist plates and the second waist plates are symmetrically distributed at two ends of the second bottom plate; the first bottom plate and the second bottom plate of the adjacent trapezoid strips are fixedly connected to form a honeycomb core with a plurality of unit cells; the panel structure also comprises at least 2 inner panels, wherein the inner panels extend along the latitudinal direction and are vertical to the width direction of the trapezoidal strips; the embedded panel is embedded into a row of cells which are sequentially arranged along the latitudinal direction, the inner embedded panel is connected with a plurality of trapezoidal strips in a bridging manner, the bottom plate and the embedded plate which correspond to the cells which are sequentially arranged along the latitudinal direction are fixedly connected, the installation side of the inner embedded panel is arranged on the honeycomb core, and the distance between the end face of the bottom plate and the embedded plate which are fixedly connected and the end face of the waist plate is not smaller than the thickness of the embedded plate.

In the present invention, the warp direction and the weft direction are perpendicular to each other. A unit cell is formed by a first bottom plate of 1 trapezoid strip and waist plates on two sides of the first bottom plate, a second bottom plate of another trapezoid strip and waist plates on two sides of the second bottom plate, and the bottom plate, the waist plates and a space formed by the bottom plate, the waist plates and the space formed by the waist plates are all regarded as a part of the unit cell.

So, the first bottom plate and the second bottom plate of adjacent trapezoidal strip pile up and fixed connection, form the honeycomb core, and the embedded board embedding is in the honeycomb core and with each trapezoidal strip from the latitudinal direction connection, gives the cellular structure at the stronger resistance to compression and bending resistance of latitudinal direction to obtain the equal higher metal honeycomb structure of each direction structural strength.

Further, the bottom plates corresponding to the unit grids sequentially arranged along the latitudinal direction are welded or glued with the embedded plate, optionally welded through resistance welding, and optionally spot-welded at 4-6 points.

Furthermore, the bottom plate that the cell that arranges in proper order along the latitudinal direction corresponds has the portion of bending, the portion of bending is perpendicular with the bottom plate, and extends towards the cell inboard in place, forms the terminal surface that supplies with interior panel fixed connection. In this way, a space for accommodating the inner panel is formed above the bent portion, and the bent portion can support the inner panel and provide a larger fixed connection area, such as a welding area, so that a more stable connection is formed between the inner panel and the trapezoidal strip.

Further, on the installation side of the inner embedded plate on the honeycomb core, the distance between the end face of the bottom plate corresponding to the unit cells sequentially arranged along the latitudinal direction and the end face of the waist plate fixedly connected with the inner embedded plate is equal to the thickness of the inner embedded plate, so that the inner embedded plate is flush with the top surface of the honeycomb core and is embedded in the honeycomb core.

Furthermore, the inner embedded plates are in clearance fit with the unit cells which are sequentially arranged along the latitudinal direction, so that the embedded plates are embedded into the corresponding unit cells in a matched mode, the small deformation of the unit cells can be effectively resisted, the structural strength of the honeycomb structure is further improved, and the purposes of mutually stopping elbows and reinforcing are achieved.

The applicant researches carefully to find that when the existing honeycomb structure fails, macroscopically, the defects are mainly reflected in the distortion and the breakage of a honeycomb plate and the warping and tearing of a cover plate under the action of external force; microscopically, it is mainly the plastic deformation of the honeycomb walls and the resulting tearing, destruction. According to the invention, the embedded plate is designed to be in clearance fit with the cells, so that the deformation resistance of the single cell is improved while the latitudinal stress capacity of the embedded plate is strengthened, and the overall strength of the honeycomb structure in all directions is improved.

Optionally, the embedded plate includes a plurality of lattice portions, the lattice portions are in clearance fit with the unit cells, adjacent lattice portions are integrally connected through a neck portion, the neck portion is fixedly connected with the bottom plate, and the latitudinal dimension of the neck portion is not less than 2 times of the thickness of the trapezoidal strip. Therefore, on one hand, the lattice part can help the unit lattice to resist deformation, and on the other hand, the lattice part and the neck are alternately arranged, so that the positioning and the assembly are convenient, and the automatic and intelligent production is convenient.

Preferably, the trapezoidal strips are connected by resistance welding or ultrasonic welding; the trapezoidal strip and the embedded plate are connected by one or more of laser welding, electron beam welding and resistance welding.

Preferably, check portion and the wainscot seam of the cell that locates thereof, for example through laser welding seam, so, can more effectively prevent the displacement in latitudinal direction when honeycomb is atress, further strengthen latitudinal direction intensity.

Optionally, the gap width is 0.03-0.5 mm.

Furthermore, the waist plate corresponding to the unit grids sequentially arranged along the latitudinal direction is provided with a boss abutted against the embedded plate. The boss can play location and supporting role to the interior panel, and simultaneously, boss and interior panel contact position can regard as the welding point, conveniently carry out more firm fixed connection.

Furthermore, the number of the inner panels is multiple, the inner panels are sequentially arranged along the warp direction, and N columns of cells are arranged between every two adjacent inner panels, wherein N is a natural number.

Furthermore, an inner panel is arranged in each group of unit cells which are sequentially arranged along the latitudinal direction.

Preferably, 2 blocks of panels are arranged in each row of unit cells which are sequentially arranged along the latitudinal direction, and the 2 blocks of panels are oppositely distributed at two ends of the unit cells.

Aiming at the scheme that inner embedded plates are arranged in each group of cells which are sequentially arranged along the latitudinal direction, the honeycomb structure can be directly applied to engineering without using a brazing process, so that even if the trapezoidal strips and the inner embedded plates of the honeycomb structure are made of 5 series aluminum alloy, 6 series aluminum alloy, 7 series aluminum alloy and the like which are difficult to braze, the honeycomb structure is feasible.

Further, the angle between the waist panel and the bottom panel is between 90-180 °, preferably 120 °.

Optionally, the length of the bottom plate and the waist plate is 0.5-40mm independently.

Optionally, the thickness of the trapezoidal strip and the embedded plate is 0.5-4mm independently.

In the existing welded honeycomb plate, a honeycomb core is arranged between two metal plates to form a so-called sandwich structure, and the honeycomb core and the metal plates are connected by a brazing method, which is the only welding mode without exception. The brazing is a metal connection method which has high technological requirements, and a special brazing furnace is needed for large-area brazing of large-sized plates, and vacuum or special protective atmosphere is also needed. In brazing of sheet materials, the usual criteria are: the welding area accounts for more than 95% of the welding area, and more than 80% of the welding area is basically qualified. In the brazing process of the honeycomb core and the metal plate, the contact area of the honeycomb core and the metal plate is smaller than 10% (generally 3-8%), namely, even if 100% of the contact area can be welded (the brazing difficulty of the honeycomb plate is far greater than that of a conventional plate), the welding area of the metal plate and the honeycomb core is smaller than 10%, and therefore the connection strength between the honeycomb core and the metal plate cannot reach an ideal degree. This situation greatly affects the performance of the honeycomb panel, and thus, the production of a metal honeycomb panel by brazing is an inevitable solution. Moreover, in order to test the performance of the brazed honeycomb plate, an index of the "peel strength" of the bond between the metal plate and the honeycomb core was specifically proposed. In the invention, the honeycomb core with the embedded plate can be directly used as a honeycomb plate, and a layer of metal plate can be covered on the working surface of the honeycomb core in a brazing mode under certain conditions, so that the contact area between the honeycomb core and the metal plate can reach higher value, even 100 percent theoretically, and the peel strength resistance value of the honeycomb plate can be obviously improved.

Optionally, in the invention, the trapezoidal strips and the embedded plates can be connected and welded together by adopting various welding processes to form metallurgical bonding between the components. Alternatively, the connections between the components may be made using a variety of non-weighted welding processes, such as: the welding process of the solderless welding flux is simple and easy to control, and weight is not increased during welding, so that the lightweight of the honeycomb structure is guaranteed.

Optionally, the trapezoidal strips are made of one of aluminum alloy, stainless steel, and titanium alloy.

Optionally, the inset panel is made of one of an aluminum alloy, stainless steel, and a titanium alloy.

The manufacturing method of the embedded weft-wise reinforced metal honeycomb structure comprises the following steps:

(1) providing a plate with the same width and thickness as the target trapezoidal strip, and rolling and forming to obtain a trapezoidal strip blank;

(2) processing a notch for accommodating the inner embedded plate on the trapezoidal strip according to the position of the inner embedded plate to obtain a trapezoidal strip;

(3) overlapping and welding the first bottom plate and the second bottom plate of every two trapezoid strips to obtain a honeycomb core;

(4) and installing the embedded plate in the honeycomb core, and welding to obtain the embedded weft-wise reinforced metal honeycomb structure.

Further, the step (2) further comprises a step of processing a boss on the waist plate connected with the bottom plate, preferably, the boss is processed by adopting a stamping process, and the formed protrusion can also play a role of a reinforcing rib on the trapezoidal strip, so that the strength of the metal honeycomb structure is further improved; in addition, the boss part formed by stamping can enable two surfaces of the trapezoidal strip to be communicated, and adjacent unit cells are communicated in the honeycomb core, so that air convection among the unit cells can be facilitated.

Optionally, in the step (4), the inner panel and the bottom plate of the trapezoidal strip are welded by spot welding, and then, the part where the inner panel is connected with the waist plate is welded by laser welding.

Optionally, after the step (4), the method further includes a step of annealing the honeycomb structure to eliminate welding stress, so as to further improve mechanical properties of the honeycomb structure.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, the longitudinal and transverse interweaving and ring buckling structure is formed by combining the trapezoidal strips and the longitude and latitude of the embedded plate, and the finally obtained metal honeycomb structure has stronger structural strength in all directions.

(2) The raw materials for constructing the metal honeycomb structure are common metal strips and plates and can be directly obtained from corresponding coiled materials, so the scheme of the invention is suitable for large-scale and continuous production of the metal honeycomb structure, and the obtained product can adapt to more engineering occasions, thereby expanding the application range.

(3) In the invention, the weaving forms of the trapezoidal strips and the embedded plates are simple and ingenious, and the trapezoidal strips and the embedded plates can be manufactured in a stamping mode, thereby creating conditions for the automatic continuous production of the metal honeycomb structure, being beneficial to simplifying the process and reducing the manufacturing cost.

(4) The production of the metal honeycomb structure with the same specification can only use sheet materials with one or two sizes, is beneficial to optimizing the production process, reducing the variety and the number of stamping dies, reducing the raw material inventory and reducing the production cost.

(5) When the inner embedded plates are arranged in each group of cells which are sequentially arranged along the latitudinal direction, the surface of the metal honeycomb structure can be directly coated with paint, pasted with decorative plates, paved with floors and carpets and the like when the metal honeycomb structure is applied to engineering; and the upper surface and the lower surface of the honeycomb structure can be further covered with metal plates by brazing and other methods, so that the contact area between the metal plates and the honeycomb structure is greatly increased, the lateral shear stress resistance of the finally obtained honeycomb plate is further improved, and the metal plates can better resist warping and tearing.

(6) The metal honeycomb structure has the characteristics of light weight, high strength, fire resistance, corrosion resistance, low cost, long service life and the like. Nowadays, the safety standard is increasingly improved, and the composite material can be widely used in the industries of railways, aviation, traffic, marine transportation, buildings and the like, and can be used as box boards, floors, partition boards, door panels and the like.

Drawings

Fig. 1 is a schematic structural diagram of a trapezoidal bar of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

Fig. 3 is one of the perspective views of a honeycomb core of the present invention.

Fig. 4 is a partially enlarged view of fig. 3.

Fig. 5 is a second perspective view of a honeycomb core of the present invention.

Fig. 6 is a partially enlarged view of fig. 5.

Fig. 7 is an exploded view of a metal honeycomb structure of the present invention.

Fig. 8 is a perspective view of a metal honeycomb structure of the present invention.

Fig. 9 is a partially enlarged view of fig. 8.

Fig. 10 is a perspective view of a metal honeycomb structure of the present invention (partially exposed).

Figure 11 is an elevational view of a metal honeycomb of the present invention.

FIG. 12 is a diagram of several configurations of the inner panel of the present invention.

Fig. 13 is a schematic view of the process of manufacturing the trapezoidal shaped bar blank of the present invention.

Fig. 14 is a schematic view of the process of further processing the trapezoidal shaped strip blank of the present invention into trapezoidal shaped strips.

Fig. 15 is an enlarged view of a portion of one of the inset panels of fig. 12.

Detailed Description

The following description describes alternative embodiments of the invention to teach one of ordinary skill in the art how to make and use the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.