CN114798929B - Metamaterial structure unit, three-dimensional structure, assembly mold, device and method - Google Patents

Metamaterial structure unit, three-dimensional structure, assembly mold, device and method Download PDF

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Publication number
CN114798929B
CN114798929B CN202210512818.6A CN202210512818A CN114798929B CN 114798929 B CN114798929 B CN 114798929B CN 202210512818 A CN202210512818 A CN 202210512818A CN 114798929 B CN114798929 B CN 114798929B
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metamaterial
layer
unit
units
metamaterial structure
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CN114798929A (en
Inventor
王继来
崔青浩
饶静
李取浩
马海峰
高兴
孙逊
玄晓旭
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Shandong University
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Shandong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

The invention relates to a metamaterial structure unit, a three-dimensional structure, an assembling die, a device and a method, wherein the metamaterial structure unit comprises a plurality of concave structures and convex structures which are alternately arranged, the concave structures and the convex structures are respectively provided with a clamping groove, the width of each clamping groove is not smaller than the thickness of the metamaterial structure unit, inserting columns are arranged in the clamping grooves of the convex structures, inserting holes are formed in the clamping grooves of the concave structures, and the diameter of each inserting column is not larger than the diameter of each inserting hole.

Description

Metamaterial structure unit, three-dimensional structure, assembly mold, device and method
Technical Field
The invention relates to the technical field of metamaterial, in particular to a metamaterial structural unit, a three-dimensional structure, an assembly die, a device and a method.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The mechanical metamaterial is an artificial structure body, which has the property which is contrary to the conventional mechanical property, the mechanical metamaterial is derived from the geometric structure of a microstructure unit instead of each component of the mechanical metamaterial, patent CN112355142B discloses a device, equipment and a method for processing the metamaterial structure unit, and discloses a metamaterial structure unit processed by the device, wherein the metamaterial structure unit is provided with a concave structure and a convex structure which are alternately arranged, the concave structure and the convex structure are respectively provided with a clamping groove, the width of each clamping groove is slightly smaller than the thickness of the metamaterial unit, when a plurality of metamaterial units are assembled, the adjacent upper and lower layers of metamaterial units are mutually perpendicular, the concave structures and the convex structures of the metamaterial units of the adjacent layers are matched, the manual operation is clamped through the mutual interference fit of the clamping grooves, and finally a three-dimensional structure is obtained; meanwhile, the three-dimensional mechanical metamaterial assembled through interference fit is not firm enough in connection, the assembled part is easily loosened under the influence of various factors such as friction abrasion and the like, so that the assembled three-dimensional mechanical metamaterial is not stable enough and has impaired performance, particularly, the tensile capacity is poor, and the assembled mechanical metamaterial is easily unstable in structure in the horizontal plane direction in the compression process, so that the performance is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a metamaterial structure unit, when the metamaterial structure unit is assembled into a three-dimensional structure, the adjacent layer structure units do not need to be connected by interference fit, and the assembled three-dimensional metamaterial structure is stable and is not easy to damage.
In order to achieve the above purpose, the invention adopts the following technical scheme
In a first aspect, an embodiment of the present invention provides a metamaterial structure unit, including a plurality of concave structures and convex structures that are alternately arranged, where the concave structures and the convex structures are both provided with a clamping groove, the width of the clamping groove is not smaller than the thickness of the metamaterial structure unit, an inserting column is arranged in the clamping groove of the convex structure, an inserting hole is arranged in the clamping groove of the concave structure, and the diameter of the inserting column is not greater than the diameter of the inserting hole.
In a second aspect, an embodiment of the present invention provides a three-dimensional metamaterial structure, including a plurality of layers of metamaterial structure units according to the first aspect, each layer has a plurality of metamaterial structure units, concave structures and convex structures of two adjacent metamaterial structure units on the same side are staggered, in two adjacent layers of metamaterial structure units, the convex structure of one layer of metamaterial structure unit and the concave structure of the adjacent layer of metamaterial structure unit are clamped through a clamping groove, and a plug post of the convex structure of one layer of metamaterial structure unit passes through a jack of the concave structure of the adjacent layer of metamaterial structure unit, and a portion of the plug post extending out of the jack is pressed to form a portion with a diameter larger than that of the jack.
In a third aspect, an embodiment of the present invention provides a method for assembling a metamaterial unit, in which a protruding structure of a metamaterial unit of one layer and a concave structure of a metamaterial unit of an adjacent layer are matched through a clamping groove, a plug is inserted into a socket, and a portion of the plug inserted into the socket is extruded, so that a portion of the plug extending out of the socket forms a riveted portion, and a diameter of the riveted portion is larger than that of the socket.
In a fourth aspect, embodiments of the present invention provide a metamaterial structural unit assembling die, comprising:
the lower layer die is used for fixing a plurality of metamaterial structure units at the bottommost layer;
the middle layer die is provided with a plurality of force transmission parts, a gap for the metamaterial structural units to pass through is formed between the adjacent force transmission parts, and the force transmission parts can be contacted with the parts of the inserting columns of the plurality of lower-layer metamaterial structural units extending out of the inserting holes of the upper-layer metamaterial structural units;
the upper layer die is provided with a plurality of extrusion parts, and the extrusion parts can be contacted with the middle layer die and are used for applying extrusion force to the inserted column through the middle layer die.
Optionally, the bottom surface of middle level mould is provided with a plurality of constant head tanks, and the diameter of constant head tank is greater than the diameter of spliced pole, and the constant head tank can cooperate with the spliced pole, realizes the location to middle level mould.
Optionally, the bottom layer mould is provided with a plurality of fixed orifices, and the fixed orifices matches with the cylinder that the meta-material structural unit protruding structure bottom surface of the bottommost set up.
Optionally, the distance between two adjacent pressing parts is not smaller than the thickness of the metamaterial structural unit.
Optionally, the axial direction of the force transmission part is set to be the diagonal direction of the integral structure formed by the same layer of metamaterial structural units after being placed.
In a fifth aspect, an embodiment of the present invention provides a metamaterial structural unit assembling device, including the metamaterial structural unit assembling die in the fourth aspect, further including a press, wherein the lower die is fixed on a workbench of the press, and the upper die is fixed on a vertical driving part of the press.
In a sixth aspect, an embodiment of the present invention provides a working method of a metamaterial unit structure assembly device, including the steps of:
placing a plurality of upper-layer metamaterial structure units on a plurality of fixed lower-layer metamaterial structure units, wherein the upper-layer metamaterial structure units are arranged vertically to the lower-layer metamaterial structure units, and inserting columns of the lower-layer metamaterial structure units penetrate through inserting holes of the upper-layer metamaterial structure units;
placing a middle layer mould, wherein the middle layer mould is contacted with the end face of the inserting column of the lower layer metamaterial structure unit penetrating through the inserting hole;
the upper layer die extrudes a plurality of inserting posts through the middle layer die under the drive of the vertical driving part of the press machine to form a riveting part with the diameter larger than that of the inserting holes, and the assembly of two adjacent layers of metamaterial structural units is completed.
The invention has the beneficial effects that:
1. according to the metamaterial structure unit and the assembling method, the width of the clamping groove is not smaller than the thickness of the metamaterial structure unit, the diameter of the insertion hole is not smaller than the diameter of the insertion column, so that interference fit cannot occur during assembling, the riveting part is formed by extruding the part of the insertion column extending out of the insertion hole, the upper and lower layers of the metamaterial structure unit are assembled and fixed, and the assembling part is not required to be connected in an interference fit mode, so that the assembled three-dimensional mechanical metamaterial is prevented from being easily loosened due to the fact that the assembled three-dimensional mechanical metamaterial is not stable enough and has damaged performance, the stability of the three-dimensional metamaterial structure is improved, and the processing precision requirement on the metamaterial structure unit is lowered.
2. According to the metamaterial structure unit and the assembling method, the riveting parts are adopted to realize the anchoring of the metamaterial structure units on the upper side and the lower side, and can bear tensile force and relative bending moment between two adjacent metamaterial structure units, so that the compression and tension capacity of the whole metamaterial three-dimensional structure is improved, and the structural instability phenomenon in the horizontal plane direction in the compression process of the metamaterial three-dimensional structure is avoided.
3. According to the metamaterial structure unit assembling die, the middle layer die is arranged, so that the plurality of inserting columns of the metamaterial structure unit at the lower layer can be flattened by the extrusion force at the same time, and the inserting columns cannot be flattened by a press machine directly due to the small size, so that the plurality of inserting columns are extruded at the same time by the press machine through the middle layer die, the whole-layer metamaterial structure unit is assembled, and the working efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not limit the application.
FIG. 1 is a schematic structural diagram of a metamaterial unit corresponding to the structure of embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a metamaterial unit corresponding to the second structure in embodiment 1 of the present invention;
FIG. 3 is a schematic structural diagram of a metamaterial unit corresponding to the third structure in embodiment 1 of the present invention;
FIG. 4 is a schematic structural diagram of a metamaterial unit corresponding to the fourth structure in embodiment 1 of the present invention;
FIG. 5 is a schematic overall structure of embodiment 2 of the present invention;
FIG. 6 is a schematic view of the bottom mold structure of embodiment 3 of the present invention;
FIG. 7 is a schematic diagram of a middle mold in accordance with an embodiment 3 of the present invention;
FIG. 8 is a schematic diagram of a middle mold in embodiment 3 of the present invention;
FIG. 9 is a schematic diagram showing the upper mold structure of embodiment 3 of the present invention;
FIG. 10 is a schematic diagram of a top mold structure according to embodiment 3 of the present invention;
FIG. 11 is a schematic diagram showing the assembly of a first layer of metamaterial unit and a bottom layer mold in accordance with embodiment 5 of the present invention;
FIG. 12 is a top view of a first layer of metamaterial structures unit and bottom layer mold assembly in accordance with example 5 of the present invention;
FIG. 13 is a schematic diagram showing the assembly of a first layer of metamaterial structures and a second layer of metamaterial structures according to embodiment 5 of the present invention;
FIG. 14 is a second schematic diagram illustrating the assembly of a first layer of metamaterial structures and a second layer of metamaterial structures according to embodiment 5 of the present invention;
FIG. 15 is a schematic view showing the installation of a middle layer mold in example 5 of the present invention;
FIG. 16 is a top view of a middle layer mold assembly according to example 5 of the present invention;
FIG. 17 is a schematic view showing the processing state of embodiment 5 of the present invention;
FIG. 18 is a schematic view showing a process of forming a rivet portion according to embodiment 5 of the present invention;
the novel die comprises a cylinder, a 2.V type structure, a plug, a jack, a bottom die, a fixing hole, a middle die body, a force transmission part, a positioning groove, an upper die body, an extrusion part and a riveting part, wherein the plug is arranged in the cylinder, the jack is arranged in the bottom die, the fixing hole is arranged in the bottom die, the middle die body is arranged in the fixing hole, the force transmission part is arranged in the middle die body, the positioning groove is arranged in the positioning groove, the upper die body is arranged in the positioning groove, the extrusion part is arranged in the upper die body, and the riveting part is arranged in the extrusion part.
Detailed Description
Example 1
The present embodiment provides a metamaterial structure unit, which includes a plurality of alternately arranged convex structures and concave structures, in the present embodiment, the metamaterial structure unit is an improvement based on the metamaterial structure unit disclosed in patent CN112355142B, the metamaterial structure unit includes a plurality of columns 1, a V-shaped structure 2 is provided between ends of adjacent columns 1, a concave structure is formed at a corner of the V-shaped structure 2, and the ends of the columns 1 form the convex structure.
In this embodiment, there are four types of metamaterial structural units, which are a first structure, a second structure, a third structure and a fourth structure.
As shown in fig. 1-2, the first and second structures are arranged between one ends of the adjacent columns 1, the side end of the first structure is a convex structure, the side end of the second structure is a concave structure, and the metamaterial structure units of the first and second structures are alternately arranged as the metamaterial structure units of the lowest layer.
As shown in fig. 3-4, a V-shaped structure 2 is arranged between two ends of the adjacent columns 1, wherein the side end of the structure three is a convex structure, the end of the structure four is a concave structure, the structure three and the structure four are used as metamaterial structural units of the middle layer, and the structure three and the structure four are alternately arranged to form a complete metamaterial structural unit layer during assembly.
The protruding structure of metamaterial structure unit is provided with the draw-in groove, and concave structure also is provided with the draw-in groove, and upper and lower two-layer draw-in groove's width is not less than metamaterial structure unit's thickness for when adjacent upper and lower two-layer metamaterial structure unit assembly, interference fit can not appear.
The bottom groove surface of the clamping groove of the convex structure is provided with the inserting column 3, and correspondingly, the bottom groove surface of the clamping groove of the concave structure is provided with the inserting hole 4, the inserting hole is a through hole, and the size of the inserting hole is not smaller than that of the inserting column, so that interference fit cannot occur when the inserting column is inserted into the inserting hole.
Example 2:
the present embodiment provides a three-dimensional metamaterial structure, as shown in fig. 5, which is formed by the metamaterial structure units in the multilayer embodiment 1, wherein in the metamaterial structure units on the same side, the convex structures and the concave structures of two adjacent metamaterial structure units are staggered. In this embodiment, the metamaterial structural units corresponding to the first and second structures are used as the metamaterial structural units of the lowest layer, and the metamaterial structural units of the first and second structures are alternately arranged so that the convex structures and the concave structures of the adjacent metamaterial structural units are staggered.
In the metamaterial structure units of two adjacent layers, the metamaterial structure units of the lower layer and the metamaterial structure units of the upper layer are mutually perpendicular.
The clamping grooves of the convex structures of the upper-layer metamaterial structure units are clamped with the clamping grooves of the concave structures of the corresponding lower-layer metamaterial structure units.
The clamping groove of the concave structure of the upper-layer metamaterial structure unit is clamped with the clamping groove of the convex structure of the corresponding lower-layer metamaterial structure unit.
The inserted column 3 in the protruding structure clamping groove of the lower metamaterial structure penetrates into the jack 4 of the concave structure of the upper metamaterial structure unit and extends out of the jack.
In this embodiment, the portion of the insert pin extending out of the insertion hole is extruded to form a caulking portion, and the diameter of the caulking portion is larger than that of the insertion hole.
Through setting up the riveting portion, can bear pulling force on the one hand, improved the tension capacity of whole metamaterial three-dimensional structure, riveting portion and concave structure face contact moreover can bear certain moment of flexure, avoid adjacent two-layer metamaterial structure unit to produce and rotate, and then avoided the structure unstability of horizontal plane orientation to appear in the metamaterial structure unit compression process after the assembly.
Meanwhile, the width of the clamping groove is not smaller than the thickness of the metamaterial structure unit, and the diameter of the inserting column 3 is not larger than the diameter of the inserting hole 4, so that interference fit does not exist in the assembling process of the metamaterial structure unit, the phenomenon that the assembled three-dimensional mechanical metamaterial is easily loosened due to the fact that the assembled part is affected by various factors such as friction wear is avoided, stability and performance of the assembled three-dimensional mechanical metamaterial are not stable enough, stability of the three-dimensional metamaterial structure is improved, and machining precision requirements on the metamaterial structure unit are reduced.
Example 3
The present embodiment provides an assembling die for a metamaterial structural unit according to embodiment 1, which comprises a bottom die 5, a middle die and an upper die.
As shown in fig. 6, the bottom die 5 adopts a cubic structure, the horizontal section of the bottom die is square, a plurality of rows of fixing holes 6 are formed in the upper surface of the bottom die 5, the fixing holes 6 are matched with the columns 1 of the metamaterial structural units, and the columns 1 of the metamaterial structural units can be inserted into the fixing holes 6 to fix the bottom die 5.
In this embodiment, the metamaterial structure units of the first and second structures are fixedly connected with the bottom mold 5, and the first and second structures can be alternately fixed on the bottom mold 5, and because the convex structures and concave structures of the metamaterial structure units of the first and second structures are alternately distributed, two adjacent rows of fixing holes 6 on the bottom mold are alternately arranged. In the same row of fixing holes 6, the distance between two adjacent fixing holes 6 is matched with the distance between two adjacent columns 1 of the metamaterial structural unit.
As shown in fig. 7-8, the middle layer mold comprises an L-shaped middle layer mold body 7, wherein a plurality of force transmission parts 8 are arranged on the middle layer mold body, and gaps for passing through metamaterial structural units are arranged between adjacent force transmission parts 8.
In this embodiment, the same metamaterial unit structure forms a square structure, and the posts 3 of the lower metamaterial unit structure are distributed along the diagonal of the square, so that the axis of the force transmission part is arranged along the diagonal of the square, so that the middle layer mold can cover all the posts 3 of the lower metamaterial unit structure, and in this embodiment, the included angle between the force transmission part 8 and the middle layer mold body 7 is 45 °.
Through the arrangement of the gaps between the force transmission parts 8, the upper-layer metamaterial structure units can pass through the middle-layer mould and are connected to the lower-layer metamaterial structure units, so that the middle-layer mould does not interfere with the connection of the two adjacent layers of metamaterial structure units.
In order to conveniently position the middle layer mould, the lower surface of the force transmission part is provided with a plurality of positioning grooves 9, the positioning grooves 9 are matched with the shape of the inserted column 4, and the inserted column 4 can extend into the positioning grooves 9 to position the middle layer mould. In order to avoid the influence of the positioning groove 9 on the flattening of the plug 4, the diameter of the positioning groove 9 is larger than that of the plug 4, so that the positioning groove 9 can position the plug in a general position instead of precisely positioning.
As shown in fig. 9-10, the upper layer mold comprises an upper layer mold body 10, a plurality of extrusion parts 11 are arranged on the bottom surface of the upper layer mold body 10, and the distance between two adjacent extrusion parts 11 is not smaller than the thickness of the metamaterial structure unit, so that the extrusion parts 11 can extend into the space between two adjacent metamaterial structure units on the upper layer and contact with the middle layer mold, and further extrusion force is applied to the inserted columns of the lower layer metamaterial unit through the middle layer mold.
Example 4
The embodiment provides an assembling device for the metamaterial structure unit in embodiment 1, which comprises an assembling die for the metamaterial structure unit in embodiment 3.
The press machine is provided with a working table, a vertical motion driving part is arranged above the working table, the vertical motion driving part adopts a hydraulic cylinder or other parts capable of outputting linear motion, the hydraulic cylinder is used for applying pressure load to a workpiece on the working table, and other structures of the press machine are provided with the existing structures and are not described in detail herein.
In this embodiment, the bottom layer mould is fixed on the workstation of press, and upper die passes through the bolt detachable and is connected with vertical motion drive part, or installs a rotary part in vertical motion drive part's motion output part bottom, and rotary part is connected with upper die, and rotary part can drive upper die rotation 90, and rotary part can adopt revolving cylinder or motor etc..
Example 5
The present embodiment provides a working method of the assembling device of the metamaterial structural unit according to embodiment 4, including the following steps:
step 1: as shown in fig. 11-12, a plurality of metamaterial structure units corresponding to the first structure and the second structure are alternately fixed on the bottom layer die through fixing holes to form a first layer of metamaterial structure unit.
Step 2: as shown in fig. 13 to 14, a plurality of metamaterial structure units corresponding to the third structure and the fourth structure are alternately placed on the first layer of metamaterial structure units to form a second layer of metamaterial structure units, specifically, the second layer of metamaterial structure units are mutually perpendicular to the first layer of metamaterial structure units, the convex structures of the second layer of metamaterial structure units are connected with the concave structures of the corresponding first layer of metamaterial structure units in a clamping way through clamping grooves, the inserting posts 3 of the first layer of metamaterial structure units penetrate through the inserting holes 4 of the second layer of metamaterial structure and have parts extending out to the upper parts of the inserting holes 4, and the metamaterial structure units corresponding to the third structure and the fourth structure are sequentially assembled with the metamaterial structure units of the first layer until the second layer of metamaterial structure units are assembled.
As shown in fig. 15 to 16, the middle layer mold is placed in a diagonal direction of a horizontal square cross section of the structure body formed by the second layer metamaterial structure unit so that the plurality of force transfer portions 8 of the middle layer mold are located above the posts 3 of the first layer metamaterial structure, and then the middle layer mold is lowered so that the middle layer mold is in contact with the top surfaces of all the posts 3 of the first layer metamaterial structure.
Step 3: as shown in fig. 17, the hydraulic cylinder of the press drives the upper die to move downward, the extrusion part 11 stretches into the space between two adjacent metamaterial structural units of the second layer and contacts with the middle die, the middle die is extruded, and then the middle die is utilized to extrude the plurality of inserting posts 3 into the flat riveting part 12 with the diameter larger than the diameter of the insertion hole, so that the assembly of the metamaterial structural units of the second layer and the metamaterial structural units of the first layer is completed.
In this embodiment, as shown in fig. 18, since the rigidity in the vertical direction of the entire metamaterial structural unit is much larger than that of the plug post 3, the columnar flattening to form the caulking portion 12 is preferentially achieved in the extrusion process.
Step 4: the hydraulic cylinder of the press drives the upper layer die to move upwards, the middle layer die is taken out, then the third layer of metamaterial structural unit is installed, the third layer of metamaterial structural unit is perpendicular to the second layer of metamaterial structural unit, the assembling method is the same as that of the first layer of metamaterial structural unit and the second layer of metamaterial structural unit, after the assembling is completed, the middle layer die is installed, the upper layer die is rotated by 90 degrees by using the rotating component, and the upper layer die is used for driving the middle layer die to flatten the inserting column of the second layer of metamaterial structural unit to form a riveting part.
Step 5: and (4) repeating the step until the assembly of all layers of metamaterial structural units is completed.
By adopting the assembling device of the embodiment, the simultaneous extrusion of a plurality of inserted columns by using a press machine is realized through the middle layer die, the assembly of a whole metamaterial structure unit is realized, and the working efficiency is improved.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.

Claims (7)

1. The method for assembling the metamaterial structure unit is characterized in that the metamaterial three-dimensional structure comprises a plurality of layers of metamaterial structure units, the metamaterial structure units comprise a plurality of concave structures and convex structures which are alternately arranged, the concave structures and the convex structures are respectively provided with a clamping groove, the width of each clamping groove is not smaller than the thickness of the metamaterial structure unit, each clamping groove of the convex structure is internally provided with an inserting column, each clamping groove of the concave structure is internally provided with an inserting hole, and the diameter of each inserting column is not larger than the diameter of each inserting hole;
each layer is provided with a plurality of metamaterial structure units, concave structures and convex structures of two adjacent metamaterial structure units of the same layer are staggered, in the two adjacent metamaterial structure units, the convex structure of one layer of metamaterial structure unit and the concave structure of the adjacent metamaterial structure unit are clamped through clamping grooves, and a plug post of the convex structure of one layer of metamaterial structure unit penetrates through a jack of the concave structure of the adjacent metamaterial structure unit, and the part of the plug post extending out of the jack is pressed to form a part with the diameter larger than that of the jack;
matching the convex structure of one layer of metamaterial structure unit with the concave structure of the metamaterial structure unit of the adjacent layer through a clamping groove, enabling the inserting column to pass through the jack, and extruding the part of the inserting column passing through the jack, so that a riveting part is formed at the part of the inserting column extending out of the jack, and the diameter of the riveting part is larger than that of the jack;
by arranging the riveting part, on one hand, the tension force can be borne, the tension capacity of the whole metamaterial three-dimensional structure is improved, and the riveting part is contacted with the concave structure surface, so that a certain bending moment can be borne, and the rotation of two adjacent layers of metamaterial structural units is avoided;
the assembling method of the metamaterial structure unit adopts a metamaterial structure unit assembling die and comprises the following steps:
the bottom layer mould is used for fixing a plurality of metamaterial structure units at the bottommost layer;
the middle layer die is provided with a plurality of force transmission parts, a gap for allowing the metamaterial structural units to pass through is formed between the adjacent force transmission parts, and the force transmission parts can be contacted with the parts of the inserting columns of the plurality of lower-layer metamaterial structural units extending out of the inserting holes of the upper-layer metamaterial structural units;
the upper layer die is provided with a plurality of extrusion parts, and the extrusion parts can be contacted with the middle layer die and are used for applying extrusion force to the inserted column through the middle layer die.
2. The assembling method of a metamaterial structure unit according to claim 1, wherein a plurality of positioning grooves are formed in the bottom surface of the middle layer die, the diameter of each positioning groove is larger than that of each inserting column, and the positioning grooves can be matched with the inserting columns to position the middle layer die.
3. The assembling method of metamaterial unit according to claim 1, wherein the bottom die is provided with a plurality of fixing holes, and the fixing holes are matched with columns arranged on the bottom surface of the protruding structure of the metamaterial unit at the bottom.
4. A method of assembling a metamaterial unit according to claim 1, wherein the distance between two adjacent ones of the pressing portions is not smaller than the thickness of the metamaterial unit.
5. A method of assembling a metamaterial unit structure as claimed in claim 1, wherein the axial direction of the force transmitting portion is set to be the diagonal direction of the overall structure formed by the same layer of metamaterial unit structure after being placed.
6. A metamaterial structure unit assembling device based on the assembling method of claim 1, and further comprising a press machine, wherein the bottom layer die is fixed on a workbench of the press machine, and the upper layer die is fixed on a vertical driving part of the press machine.
7. A method of operating the metamaterial unit cell assembly device as defined in claim 6, comprising the steps of:
placing a plurality of upper-layer metamaterial structure units on a plurality of fixed lower-layer metamaterial structure units, wherein the upper-layer metamaterial structure units are arranged vertically to the lower-layer metamaterial structure units, and inserting columns of the lower-layer metamaterial structure units penetrate through inserting holes of the upper-layer metamaterial structure units;
placing a middle layer mould, wherein the middle layer mould is contacted with the end face of the inserting column of the lower layer metamaterial structure unit penetrating through the inserting hole;
the upper layer die extrudes a plurality of inserting posts through the middle layer die under the drive of the vertical driving part of the press machine to form a riveting part with the diameter larger than that of the inserting holes, and the assembly of two adjacent layers of metamaterial structural units is completed.
CN202210512818.6A 2022-05-12 2022-05-12 Metamaterial structure unit, three-dimensional structure, assembly mold, device and method Active CN114798929B (en)

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