阅读说明：本技术 一种多胞管增强泡沫铝结构及其制造工艺 (Multi-cell-tube reinforced foamed aluminum structure and manufacturing process thereof ) 是由 张钱城 黄磊 于 2020-06-04 设计创作，主要内容包括：本发明公开了一种多胞管增强泡沫铝结构及其制造工艺,多胞管增强泡沫铝结构从外到内设置有中心通孔圆筒泡沫铝,十字加筋多胞圆管和四分之一圆柱体泡沫铝；制备方法是先采用电火花加工技术将孔隙率70％～90％的闭孔泡沫铝板切割成中心通孔圆筒泡沫铝和四块四分之一柱体泡沫铝,再采用挤压成型工艺制备十字加筋多胞圆管,将制得的中心通孔圆筒泡沫铝、十字加筋多胞圆管、四块四分之一柱体泡沫铝进行超声清洗后烘干备用,最后从外至内采用环氧树脂将中心通孔圆筒泡沫铝、十字加筋多胞圆管和四块四分之一圆柱体泡沫铝胶接制成多胞管增强泡沫铝结构。具有吸能性能高,又不失独立承载能力,在对承载和吸能有着迫切需求的民用和军用领域具有广阔的市场前景。(The invention discloses a multi-cell tube reinforced foamed aluminum structure and a manufacturing process thereof, wherein the multi-cell tube reinforced foamed aluminum structure is provided with a cylindrical foamed aluminum with a central through hole, a cross-shaped reinforced multi-cell tube and a quarter cylinder foamed aluminum from outside to inside; the preparation method comprises the steps of firstly cutting a closed-cell aluminum foam plate with the porosity of 70% -90% into a central through-hole cylindrical aluminum foam and four quarter-cylinder aluminum foam by adopting an electric spark machining technology, then preparing a cross-shaped reinforced multi-cell circular tube by adopting an extrusion forming process, ultrasonically cleaning the prepared central through-hole cylindrical aluminum foam, the cross-shaped reinforced multi-cell circular tube and the four quarter-cylinder aluminum foam, drying for later use, and finally, gluing the central through-hole cylindrical aluminum foam, the cross-shaped reinforced multi-cell circular tube and the four quarter-cylinder aluminum foam by adopting epoxy resin from outside to inside to prepare the multi-cell tube reinforced aluminum foam structure. The energy absorption material has high energy absorption performance, does not lose independent bearing capacity, and has wide market prospect in the civil and military fields with urgent requirements on bearing and energy absorption.)

1. The utility model provides a multicellular pipe reinforcing foamed aluminum structure, its characterized in that, includes that cross adds the multicellular pipe (2), and the inside four quarter cylinder foamed aluminum (3) that set up of cross add the inside multicellular pipe (2), and the outside of cross add the multicellular pipe (2) is provided with central through-hole drum foamed aluminum (1).

2. The multicellular tube-reinforced aluminum foam structure of claim 1, wherein the outer diameter of the cross-ribbed multicellular tube (2) coincides with the central through-hole size of the central through-hole cylindrical aluminum foam (1).

3. The multicellular tube-reinforced aluminum foam structure of claim 1 wherein the cross-sectional dimension of the quarter-cylindrical aluminum foam (3) coincides with the inner diameter of the cross-ribbed multicellular tube (2).

4. The multicellular tube-reinforced aluminum foam structure of claim 1 wherein the central through-hole cylindrical aluminum foam (1) and the four quarter-cylinder aluminum foams (3) have a porosity of 70 to 90 percent.

5. The multicellular tube-reinforced aluminum foam structure of any one of claims 1-4 wherein the central through-hole cylindrical aluminum foam (1) and the four quarter-cylinder aluminum foams (3) have a crush plateau stress of 6.2-1.2 MPa and a densification strain of 0.58-0.86.

6. A manufacturing process of a multi-cell tube reinforced foamed aluminum composite elastic structure is characterized by comprising the following steps:

s1, cutting a closed-cell foamed aluminum plate with the porosity of 70% -90% into cylindrical foamed aluminum with a central through hole and four quarter-cylinder foamed aluminum by adopting an electric spark machining technology;

s2, preparing the cross reinforced multi-cell circular tube by adopting an extrusion forming process;

s3, ultrasonically cleaning the cylindrical foamed aluminum with the central through hole, the cross-shaped reinforced multi-cellular circular tube and the four quarter-cylinder foamed aluminum prepared in the steps S1 and S2, and drying for later use;

and S4, connecting the cylindrical foamed aluminum with the central through hole, the cross-shaped reinforced multi-cellular circular tube and the four quarter-cylinder foamed aluminum glue by using epoxy resin from outside to inside to form a multi-cellular tube reinforced foamed aluminum structure.

7. The multicellular tube-reinforced aluminum foam structure of claim 6 wherein, in step S2, 1061 pure aluminum or 6061 aluminum alloy is used to prepare a cross-ribbed multicellular tube, the outer diameter of which is consistent with the size of the central through hole of the cylindrical aluminum foam with the central through hole.

8. The multicellular tube-reinforced foamed aluminum structure of claim 6 wherein in step S3, the water temperature for ultrasonic cleaning is 40-60 ℃, the cleaning time is 0.5-1 h, and the temperature for drying treatment is 70-100 ℃ for 40-60 min.

Technical Field

The invention belongs to the technical field of impact-resistant and energy-absorbing structures, and particularly relates to a multi-cell-tube reinforced foamed aluminum structure and a manufacturing process thereof.

Background

Foamed aluminum, as a representative of structural function integration, has been gradually applied in various fields such as aerospace, rail transit and the like in recent years due to its excellent mechanical, acoustic and thermal insulation properties, especially excellent energy absorption properties (the compression stress-strain curve of which includes a long plateau). However, the foamed aluminum has low strength due to high porosity and inevitable processing defects, can bear small load when used alone, and is easy to collapse, so that the engineering application of the foamed aluminum as a load-bearing structure is limited. Meanwhile, the thin-wall single-cell tube is used as a traditional energy-absorbing and shock-absorbing material, and has the advantages of high axial bearing capacity, long stroke utilization rate and the like, but the energy-absorbing efficiency is not high.

The multi-cell tube is a structure for multicellizing the section of the thin-wall tube, has the advantages of high number of folded angles of the section and stable deformation, and researches show that the energy absorption performance of the multi-cell tube is obviously superior to that of a single-cell tube with the same section. Therefore, the multi-cell tube is filled into the composite structure of the foamed aluminum, so that the defect of the foamed aluminum can be overcome, the energy absorption performance is high, and the independent bearing capacity is not lost.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a multi-cell tube reinforced foamed aluminum structure and a manufacturing process thereof, aiming at the defects in the prior art, and the multi-cell tube reinforced foamed aluminum structure has the advantages of safety, simplicity, low cost and strong repeatability.

The invention adopts the following technical scheme:

the utility model provides a multicellular pipe reinforcing foamed aluminum structure, includes the crisscross and adds muscle multicellular pipe, and the inside four quarter cylinder foamed aluminum that set up of crisscross muscle multicellular pipe, the outside that the crisscross adds muscle multicellular pipe is provided with central through-hole drum foamed aluminum.

Specifically, the outer diameter of the cross-shaped reinforced multi-cellular circular tube is consistent with the size of a central through hole of the central through hole cylinder foamed aluminum.

Specifically, the cross section size of the quarter cylinder foamed aluminum is consistent with the inner diameter of the cross-shaped reinforced multi-cellular circular tube.

Specifically, the porosity of the central through hole cylinder foamed aluminum and the four quarter cylinder foamed aluminum is 70% -90%.

Furthermore, in the multi-cell tube reinforced foamed aluminum structure, the crushing platform stress corresponding to the central through hole cylindrical foamed aluminum and the four quarter-cylinder foamed aluminum is 6.2-1.2 MPa, and the densification strain is 0.58-0.86.

The invention is also characterized in that the manufacturing process of the multi-cell tube reinforced foamed aluminum composite elastic structure comprises the following steps:

s1, cutting a closed-cell foamed aluminum plate with the porosity of 70% -90% into cylindrical foamed aluminum with a central through hole and four quarter-cylinder foamed aluminum by adopting an electric spark machining technology;

s2, preparing the cross reinforced multi-cell circular tube by adopting an extrusion forming process;

s3, ultrasonically cleaning the cylindrical foamed aluminum with the central through hole, the cross-shaped reinforced multi-cellular circular tube and the four quarter-cylinder foamed aluminum prepared in the steps S1 and S2, and drying for later use;

and S4, connecting the cylindrical foamed aluminum with the central through hole, the cross-shaped reinforced multi-cellular circular tube and the four quarter-cylinder foamed aluminum glue by using epoxy resin from outside to inside to form a multi-cellular tube reinforced foamed aluminum structure.

Specifically, in step S2, a cross-ribbed multi-cellular tube is prepared from 1061 pure aluminum or 6061 aluminum alloy, and the outer diameter of the cross-ribbed multi-cellular tube is the same as the size of the central through hole cylindrical foamed aluminum.

Specifically, in step S3, the temperature of the ultrasonic cleaning is 40 to 60 ℃, the cleaning time is 0.5 to 1 hour, and the temperature of the drying treatment is 70 to 100 ℃, and the time is 40 to 60 min.

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

the invention discloses a multi-cell reinforced foamed aluminum structure, for the composite structure, as foamed aluminum provides enough lateral support for the multi-cell, the buckling mode of a thin-wall tube is changed into a shorter wavelength, and the coupling reinforcing mechanism that the cell walls of the multi-cell are mutually folded under axial pressure finally leads to the improvement of the compressive strength and the energy absorption rate of the structure compared with the pure foamed aluminum, even more than the sum of the separately tested tube shape and foam.

Furthermore, the outer diameter of the cross-shaped reinforced multi-cellular circular tube is consistent with the size of the central through hole cylinder foamed aluminum, so that when the cross-shaped reinforced multi-cellular circular tube is bonded with the central through hole cylinder foamed aluminum by adopting epoxy resin, no redundant gap exists between the components, and the components are fully bonded.

Furthermore, the cross section size of the quarter cylinder foamed aluminum is consistent with the inner diameter of the cross-shaped reinforced multi-cellular round pipe, so that when the quarter cylinder foamed aluminum and the cross-shaped reinforced multi-cellular round pipe are bonded by epoxy resin, no redundant gap exists between the components, and the components are fully bonded.

Further, in order to ensure the compressibility of the multi-cell tube reinforced foamed aluminum structure, the central through hole cylindrical foamed aluminum and the four quarter-cylinder foamed aluminum are made of foamed aluminum blocks with the porosity of 70% -90%, and the stress and the compaction strain of the crushing platform are 6.2-1.2 MPa and 0.58-0.86 respectively.

A manufacturing process of a multi-cell tube reinforced foamed aluminum composite elastic structure comprises the steps of preparing central through hole cylinder foamed aluminum and four quarter cylinder foamed aluminum by adopting an electric spark machining technology, preparing a cross-shaped reinforced multi-cell tube by adopting an extrusion forming technology, connecting the central through hole cylinder foamed aluminum, the four quarter cylinder foamed aluminum and the cross-shaped reinforced multi-cell tube through epoxy resin glue to obtain the multi-cell tube reinforced foamed aluminum structure, and improving the crushing stress of the multi-cell tube reinforced foamed aluminum structure by adopting the cross-shaped reinforced multi-cell tube. The preparation method has simple process and mature process, and can be used for batch production.

Furthermore, 1061 pure aluminum or 6061 aluminum alloy is adopted, so that the density is low, the strength is high, and the plasticity is good.

In conclusion, the preparation process is mature, and has wide market prospect in the civil and military fields which have urgent requirements on bearing and energy absorption.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a geometric drawing of a multi-cell tube reinforced aluminum foam structure of the present invention;

FIG. 2 is a graph comparing quasi-static axial compressive stress strain of the multi-cell tube reinforced foam aluminum of the present invention.

Wherein: 1. cylindrical foamed aluminum with a central through hole; 2. a plurality of round tubes with crossed ribs; 3. quarter cylinder foamed aluminium.

Detailed Description

In the description of the present invention, it is to be understood that the terms "inner", "outer", "between" and "between" indicate an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must be in a particular orientation, in a particular configuration and operation, and therefore, should not be taken as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention provides a multi-cell tube reinforced foamed aluminum structure and a manufacturing process thereof, wherein the multi-cell tube reinforced foamed aluminum structure is provided with a cylindrical foamed aluminum with a central through hole, a cross-shaped reinforced multi-cell tube and a quarter cylinder foamed aluminum from outside to inside; the preparation method comprises the steps of firstly cutting a closed-cell aluminum foam plate with the porosity of 70% -90% into a central through-hole cylindrical aluminum foam and four quarter-cylinder aluminum foam by adopting an electric spark machining technology, then preparing a cross-shaped reinforced multi-cell circular tube by adopting an extrusion forming process, ultrasonically cleaning the prepared central through-hole cylindrical aluminum foam, the cross-shaped reinforced multi-cell circular tube and the four quarter-cylinder aluminum foam, drying for later use, and finally, gluing the central through-hole cylindrical aluminum foam, the cross-shaped reinforced multi-cell circular tube and the four quarter-cylinder aluminum foam by adopting epoxy resin from outside to inside to prepare the multi-cell tube reinforced aluminum foam structure. The structure makes up the defects of low bearing capacity and easy collapse of the foamed aluminum, has high energy absorption performance, does not lose independent bearing capacity, has mature preparation process, and has wide market prospect in the civil and military fields with urgent requirements on bearing and energy absorption.

Referring to fig. 1, the multi-cell tube reinforced foamed aluminum structure of the present invention sequentially comprises a quarter-cylinder foamed aluminum 3, a cross-shaped reinforced multi-cell tube 2 and a central through-hole cylinder foamed aluminum 1 from inside to outside.

The outer diameter of the cross-shaped reinforced multi-cellular round tube 2 is consistent with the size of the central through hole cylinder foamed aluminum 1, and the cross section size of the quarter cylinder foamed aluminum 3 is consistent with the inner diameter of the cross-shaped reinforced multi-cellular round tube 2.

The central through hole cylindrical foamed aluminum 1 and the four quarter-cylinder foamed aluminum 3 are obtained by cutting foamed aluminum blocks with the porosity of 70% -90%, and the stress and the compaction strain of the corresponding crushing platforms are 6.2-1.2 MPa and 0.58-0.86 respectively.

A process for manufacturing a multicellular tube reinforced aluminum foam structure, comprising the steps of:

s1, cutting a closed-cell foamed aluminum plate with 70% -90% of porosity into cylindrical foamed aluminum with a central through hole and four quarter-cylinder foamed aluminum by adopting an Electrical Discharge Machining (EDM) technology;

s2, preparing a cross-shaped reinforced multi-cellular round tube from 1061 pure aluminum or 6061 aluminum alloy by adopting an extrusion forming process, wherein the outer diameter of the cross-shaped reinforced multi-cellular round tube 2 is consistent with the size of a central through hole of the cylindrical foamed aluminum 1 with the central through hole;

s3, ultrasonically cleaning the cylindrical foamed aluminum with the central through hole, the cross-shaped reinforced multi-cellular circular tube and the four quarter-cylinder foamed aluminum prepared in the steps S1 and S2, and drying for later use;

the water temperature of ultrasonic cleaning is 40-60 ℃, the cleaning time is 0.5-1 h, and drying treatment is carried out after surface attachments are removed, wherein the drying treatment temperature is 70 ℃ and the drying treatment time is 40-60 min.

S4, gluing the cylindrical foamed aluminum with the central through hole, the cross-shaped reinforced multi-cell circular tube and the four quarter-cylinder foamed aluminum by adopting epoxy resin to manufacture the multi-cell tube reinforced foamed aluminum structure.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.