KR101412917B1 - A cellular material with three dimensional truss structure composed of straight wires and fabrication method of the same - Google Patents

Abstract

Disclosed are a new porous structure and a method for manufacturing the same. The porous structure is a three dimensional truss structure assembled by crossing a three directional linear wire group having the azimuth of 90 degrees in space, has the light weight while the structural strength and stiffness are high. Moreover, a manufacture process is simple, so costs can be reduced. The three dimensional lattice truss structure consisting of a continuous wire group comprises a first linear wire group arranged in parallel at equal intervals on a plane, and a second linear wire group arranged in parallel at equal intervals by being overlapped with the first linear wire group to have the azimuth of 90 degrees on the first linear wire group, and includes a mesh for forming a fixed rectangular hole by fixing an intersection point of the first and second linear wire groups; and a third wire group crossed in a direction perpendicular to the mesh between the intersection points. In the three dimensional lattice truss structure, only two wires are crossed in all intersection points of the truss structure. The mesh is arranged in multi steps in parallel at equal intervals in a vertical direction on the plane, and the mesh arranged to be adjacent to each other is arranged in multi steps to move in parallel as much as an interval less than a pitch of the tetragonal hole. The three dimensional lattice truss structure is stood, so a plane composed of the mesh is to be a vertical plane. The first first linear wire group and the second linear wire group are oriented, so the form facing the mesh is to be the continuous X-orientation form.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous material having a three-dimensional truss structure composed of a straight wire and a method of manufacturing the porous material.

More particularly, the present invention relates to a porous material having a three-dimensional truss structure composed of straight wires, and more particularly, to a three-dimensional truss structure comprising a plurality of straight wires in three directions, And a porous material having a simple manufacturing process.

The present invention is derived from the research carried out as part of the mid-term researcher support project (challenge) supported by the Korea Research Foundation in 2012.

[Assignment number: 2012R1A2A1A01003405, Title: Manufacturing method of multi-scale ultra-light metal]

Truss structures have traditionally been widely used as lightweight, high strength structures for civil engineering and construction purposes. Recently, it has been reported that the structure in which the size of the truss is greatly reduced so that the length of the truss element is in the range of several micrometers to several millimeters, is excellent as a kind of porous material. That is, although the conventional porous material, which is a typical porous material, is composed of a plurality of bent elements having irregular arcs or circular shapes, the new porous material having a truss shape has excellent mechanical strength and rigidity in weight. The truss structure can be classified according to the type of the unit cell. Fig. 1 shows a single layer structure of a pyramid (a), an octet (b), and a Kagome (c) truss, which are typical truss structures, and a Kagome truss multi-layer structure (d). The method of manufacturing a material composed of the above truss is described in Wadley, Fleck, Evans (Fabrication and structural performance of periodic cellular metal sandwich structures, Composites Science and Technology Vol.63, pp.2331-2343 (2003) . Having a multi-layer truss structure composed of small cells is advantageous for homogeneity of material and suppression of buckling and resonance when used as a sandwich core material. A material having a truss structure of a single layer can be produced through sheet metal forming or wire bending, but having a multi-layer truss structure can be manufactured only by injection molding. (Chiras, DR Mumm, N. Wicks, AG Evans, JW Hutchinson, K. Dharmasena, HNG Wadley, and S. Fichter, "A method of manufacturing a truss structure by using a resin as a mold, 2002, International Journal of Solids and Structures, Vol. 39, pp. 4093-4115).

In order to solve the problems of the above-mentioned prior arts, two persons including the river of the present inventors intersected each other with six consecutive wire groups having azimuth angles of 60 degrees or 120 degrees in space to each other to form an ideal Kagome truss or octet truss- Dimensional porous lightweight structure and a manufacturing method thereof have been developed and the contents thereof are specifically disclosed in Patent No. 0708483 owned by the present applicant.

In addition, the present inventors of the present invention proposed a method for manufacturing a three-dimensional porous lightweight structure more effectively by two persons including a steel wire, wherein a three-dimensional porous lightweight structure is formed by spirally winding a continuous wire, A porous lightweight structural body and a manufacturing method thereof are proposed, and the contents thereof are specifically disclosed in Patent No. 1029183 owned by the present applicant.

FIG. 2 is a view showing a structure in which a shape similar to the three-dimensional Kagome truss of FIG. 1 is assembled with a helical wire in the registered patent No. 1029183. The three-dimensional multi-layer truss structure having a shape similar to that of the Kagome truss shown in FIG. 2 and composed of a helical wire is excellent in mechanical properties, and can be mass-produced by a continuous process.

However, when the above-described three-dimensional multi-layer truss structure is manufactured in a commonly used rectangular parallelepiped shape, the shape of the unit cell existing at the edge is not good, and therefore, it is not good in appearance and has a disadvantage in terms of mechanical strength. There is a limit to increase the arrangement density of the wires due to the interference. Accordingly, a method for manufacturing a new three-dimensional porous lightweight structure, which can be made of a spiral wire and including three types of steel cord, is disclosed in Korean Patent No. 1155267, which has a different form from that of the Kagome truss. For reference, FIGS. 3 to 7 show the structure disclosed in the patent, and FIG. 8 shows a unit cell of a multi-layer truss structure assembled with the helical wires of FIGS. 2, 3 to 7.

Separately, the present inventors have proposed a new three-dimensional (3-dimensional) wire that can be manufactured by assembling a helical wire and forming a helical wire having a smaller helical radius by having a structure in which only two wires meet at a wire intersection, A lattice truss structure and a manufacturing method thereof are proposed in Patent Registration No. 1199606. Fig. 9 shows the ideal truss structure (b) corresponding to such a structure together with the structure (a) implemented in a similar manner to the truss structure ideal for a spiral wire.

In such a structure composed of helical wires, the size of the helix radius varies depending on the number of wires passing through the wire intersections. Figs. 10 (a) to 10 (c) show the wire intersections and the cross-sectional shapes of the helical wire structures of Figs. 2, 7 and 9, respectively. The spiral wire structures of FIGS. 2, 7 and 9 are referred to as Wire-Woven Bulk Kagome (WBK), Wire-Woven Bulk Diamond (WBD), and WBC And the two wires intersect, the truss elements of the WBC with the smallest number of wire crossings are relatively less flexed.

According to a recent study by the present inventors (MG Lee, KW Lee, HK Hur, KJ Kang, "Mechanical behaviors of a wire-woven metal under compression," Composite Structures, Vol.95, pp. 267-277, When the WBC is placed in the X-orientation as shown in FIG. 11, the highest strength and stiffness of the existing wire structure during compressive or shear loading at a high porosity of 95 to 99% It has been confirmed that it can be maintained. Fig. 11 shows the WBC (a) arranged in the X-direction and its ideal truss structure (b). This excellent mechanical property is due to the special shape of the above-mentioned lowest truss element supported by four wires per pitch by the other wires crossing the wire. In Fig. 12, WBC (a) and its ideal truss structure (b) show a state of intersecting another wire with respect to one wire. As shown in Fig. 12 (a), it can be seen that the wires alternate in two directions perpendicular to each other with respect to one wire. The porosity of 95 to 99% corresponds to the porosity of the aluminum honeycomb used as the core of the lightweight sandwich. WBCs arranged in the X-direction in FIG. 11 can replace the aluminum honeycomb, And can be used for additional purposes such as fluid storage.

Nevertheless, porous materials made of helical wires are inevitably degraded in strength and stiffness to a considerable extent because their truss elements are bent. According to the study of the present inventors (MG Lee, KW Lee, HK Hur, KJ Kang, "Mechanical behaviors of a wire-woven metal under compression," Composite Structures, Vol. 95, pp. 267-277, Compared to the ideal truss structure corresponding to the bent truss, the WBC was found to have a strength reduction of about 20% and a stiffness reduction of about 50% when the compression load was applied.

On the other hand, the inventors of the present invention have proposed a method of manufacturing a structure similar to an octet as a straight wire by two persons including a stronghold, as disclosed in Japanese Patent No. 0566729. [ Fig. 13 shows the structure thereof. As clearly shown in the enlarged view of FIG. 13, unlike the ideal octet, the wires are not in close contact with each other at the intersections of the wires but are spaced apart from each other so that the joints thereof are weak and a large amount of bonding material . In addition, the present inventors have proposed a porous structure composed of a straight line wire in the out-of-plane direction and a spiral wire in the in-plane direction, for four persons including the precipitate, in Japanese Patent Registration No. 1155262. [ FIGS. 14 and 15 show the shapes of the two structures and the unit cells, which are similar to those of WBK and WBD, respectively. Composite materials were used to fabricate a structure similar to WBK and its properties were evaluated. Byung-Chul Lee, Jun-Hyeung Byun and Ki-Ju Kang, "Compressive response of new composite truss cores, B, Vol. 43, pp. 317-324, 2012), it has been found that the use of straight wire in the out-of-plane direction has significantly increased its strength, but the stiffness is still problematic due to the helical wires in the in-plane direction. In addition, the structure constructed by assembling the spiral wire is easy to handle in the manufacturing process because the wires are twisted with each other to maintain the shape of the wire intersection itself before soldering, brazing, welding, resin bonding, etc., In the case of constructing a structure using part or all of the wire, an external support is required to maintain its assembled form before the intersection is secured.

According to the above logic, it is required to develop a new porous structure having a structure and direction similar to those of the WBC shown in Fig.

The present invention has been developed to solve the above-mentioned problems. The present invention has a three-dimensional truss-like structure formed by crossing three straight wire groups having an azimuth angle of 90 degrees with respect to each other in space, and is lightweight and has structural strength and rigidity And which is advantageous from the viewpoint of economical efficiency, and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a three-dimensional lattice truss structure including a plurality of continuous wire groups, including: a first linear wire group and a second linear wire group, Wherein the first straight wire group and the second straight wire group are arranged so as to have an azimuth angle of 90 degrees and arranged at equal intervals in parallel with each other and the intersection point of the first straight wire group and the second straight wire group is fixed A lattice net forming a constant square hole; And a third wire group intersecting the intersection in a direction perpendicular to the lattice network, wherein a three-dimensional lattice truss structure intersects only two wires at all intersections of the truss structure, Wherein the lattice grids are arranged in multiple stages in parallel at a predetermined interval in the vertical direction so that the grating meshes arranged adjacent to each other are moved in parallel by an interval smaller than the pitch of the square holes, Dimensional lattice truss structure, and the first straight wire group and the second straight wire group are oriented such that a shape viewed from the lattice network is a continuous X-orientation shape. Lt; / RTI >

Also, the third wire group may be a straight wire or a spiral wire.

The intersection points of the first straight wire group, the second straight wire group, and the third wire group are fixed by any one of joining means selected from the group consisting of soldering, brazing, welding and resin bonding. A three-dimensional lattice truss structure is provided.

Wherein the first straight wire group, the second straight wire group, and the third wire group are made of at least one material selected from the group consisting of metals, ceramics, composites, and synthetic resins. Lt; / RTI >

According to another aspect of the present invention, there is provided a method of manufacturing a three-dimensional lattice truss structure, the method comprising the steps of: (a) forming a first straight wire group arranged at a predetermined interval on a plane, And a second rectilinear wire group arranged parallel to the first rectilinear wire group at equal intervals in a direction perpendicular to the rectilinear wire group, wherein the intersection of the first rectilinear wire group and the second rectilinear wire group is fixed, Arranging a network; (b) a lattice network having the same structure as that of the lattice network in the step (a) is arranged in parallel in a vertical direction on the plane at regular intervals, and the lattice nets arranged next to each other are spaced apart from each other by Arranging the first straight wire and the second straight wire in parallel to move in the direction of the first straight wire and the second straight wire; (c) repeating the steps (a) and (b) to form a plurality of lattice nets arranged at regular intervals; (d) setting the laminates so that the plane formed by the lattice network is a vertical plane and arranging the first straight wire group and the second straight wire so that the shape of the lattice network looks like a continuous X- The third wire is inserted alternately one by one in a square hole viewed in the direction of looking at the lattice nets and the third wire group is inserted between the intersections of the lattice nets in a direction perpendicular to the lattice nets, Intersect; And (e) fixing the intersection of the first straight wire group and the third wire group and the intersection of the second straight wire group and the third wire group. A method for manufacturing a truss structure is provided.

In the step (d), the third wire is inserted alternately one by one in the rectangular holes viewed in the direction of looking at the grid, then the stack is raised so that the plane formed by the grid is perpendicular to the grid, Wherein the first straight wire group and the second straight wire group are oriented such that the shape of the network is an X-orientation, and the first straight wire group and the second straight wire group are oriented in a direction perpendicular to the lattice network, And the third wire group is intersected with each other.

In addition, in the step (d), the third wire group is formed of a straight wire, and the insertion is performed only by translational movement of the third wire.

In addition, in the step (d), the third wire group is composed of a helical wire, and the insertion is performed by rotationally inserting the third wire.

The present invention can provide a porous structure having a weight-to-weight ratio and a rigidity because the truss elements are straight lines, unlike the WBC made of conventional helical wires.

In addition, in the case of forming a lattice network, simple superposition is performed without weaving, and when a straight wire is inserted in a direction perpendicular to the lattice network, the manufacturing process is simply effected because it is simply translated without performing rotation insertion have.

In addition, when a separate straight wire is inserted in a direction perpendicular to the lattice network, the inserted straight line is supported by two wires in the lattice network due to gravity, And has a favorable effect in terms of mass productivity.

1 illustrates a single layer structure and a Kagome truss multi-layer structure of a pyramid, an octet, and a Kagome truss,
FIG. 2 is a view showing a structure in which a shape similar to the three-dimensional Kagome truss of FIG. 1 is assembled into a spiral wire, in Japanese Patent No. 1029183,
FIGS. 3-7 illustrate the structure disclosed in the Korean Patent No. 1155267,
FIG. 8 is a view showing a unit cell of a multi-layer truss structure assembled with the helical wires of FIGS. 2 and 3 to 7;
9 is a view showing an ideal truss structure corresponding to a three-dimensional lattice truss structure having a structure in which only two wires meet at a wire intersection point assembled by using the helical wire proposed in Japanese Patent No. 1199606,
Figs. 10 (a) to 10 (c) are respectively a wire cross section and a cross-sectional shape of the helical wire structures of Figs. 2, 7 and 9,
FIG. 11 shows a three-dimensional truss structure having a structure in which only two wires meet at a wire intersection, in which wires in two directions in a two-dimensional network perpendicular to the bottom surface are disposed in a direction (X-direction) Figure (a) and its ideal truss structure (b)
Fig. 12 is a view showing a shape intersecting another wire with respect to one wire in WBC (a) and its ideal truss structure (b)
Fig. 13 shows a structure similar to the octet fabricated with the straight wire shown in the registered patent No. 0566729, Fig.
Figs. 14 and 15 are views showing the shape of a unit cell and a porous structure composed of a straight wire in the out-of-plane direction and a spiral wire in the in-plane direction, as shown in Japanese Patent No. 1155262,
FIGS. 16 to 19 are views for sequentially explaining the manufacturing process of the three-dimensional lattice truss structure according to the first embodiment of the present invention,
Fig. 20 is a view showing a shape (a) viewed from another angle and Fig. 19 (b) showing a shape (b) crossing another wire with respect to one wire;
21 and 22 are views for explaining a process of inserting a spiral wire and fixing an intersection during a manufacturing process of a three-dimensional lattice truss structure according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Also, throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements, unless specifically stated otherwise.

The inventors of the present invention have found from recent studies (MG Lee, KW Lee, HK Hur, KJ Kang, "Mechanical behaviors of a wire-woven metal under compression," Composite Structures, Vol. 95, pp. It is possible to provide a new porous structure having a structure and direction similar to those of the WBC while being composed of a straight wire and having excellent strength and stiffness as compared with weight and having a simple manufacturing process. Hereinafter, the present invention will be described in more detail with reference to specific examples.

First Embodiment

FIGS. 16 to 19 are views for sequentially explaining the manufacturing process of the three-dimensional lattice truss structure according to the first embodiment of the present invention.

In the manufacture of the three-dimensional lattice truss structure according to the first embodiment of the present invention, first, a lattice net intersecting each other at an azimuth angle of 90 degrees to form a constant square hole is cut into a square frame fixed frame size, 16, a plurality of wires are cut out in the form of a lattice network in the X-orientation, as shown in FIG. 16, so that the wires can be arranged in a direction of 45 degrees. The lattice network can be prepared, for example, by using a square lattice network manufactured by electric resistance welding in advance.

Next, the prepared grid is placed in the fixed frame. In Fig. 16 (a), a grid network is arranged in a fixed frame, and wires in the grid network are arranged in a 45-degree direction with respect to the frame. In order to fix the horizontal position of the lattice network disposed in the fixed frame, several columns are vertically fixed to the respective corner portions. A cylindrical spacer is coupled to each column so as to maintain a certain distance from the frame, Is made hollow and inserted through the column. In this case, when the final truss structure is to be exactly the same shape (square) when viewed from three mutually perpendicular directions, the thickness of the spacer can be designed to be (wire spacing in the lattice network - wire thickness * 2) . Of course, the present invention is not limited to this, and a desired thickness can be designed in consideration of the weight-to-weight ratio, stiffness, and porosity. 16 (b) shows a structure in which a grid of the grid shown in FIG. 16 (a) is arranged in a frame, and the grid is moved in the plane in the plane due to the columns fixed to the four corners of the frame. It can be seen that the size and position are designed so that it is completely fixed without being fixed.

Next, one spacer is inserted into each column, and another grid is laminated. The additional lattice nets are arranged in a state in which they are moved in parallel in half a pitch in the wire direction in the previously arranged lattice nets. In this case, the parallel movement can be carried out to an arbitrary degree in a pitch less than the pitch of the wire in the lattice network, and when the lattice is moved in parallel by half pitch, the square size formed when the truss structure, Of the size of the image. 17 (a), a spacer is inserted into each column, a square fixing frame such as the lowermost portion is disposed on the uppermost portion, and the column is fastened with a nut or the like Thereby fixing the entire assembly. FIG. 17 (a) shows a shape after five layers of lattice nets are stacked on a fixed frame, and FIG. 17 (b) shows a shape viewed from a room above the lattice nets. It is seen that the size of the square hole shown in FIG. 16 (b) is reduced to about half of that of the square hole shown in FIG.

Next, the assembly fixed so that the grating net is perpendicular to the horizontal plane, that is, the plane formed by the grating net is rotated by 90 degrees, and the assembly is alternately arranged in a small rectangular hole formed in the direction in which the grating net is viewed. Insert the wire. 18 (b), 18 (a), 18 (b) and 18 (b) show a state in which a part of straight wire is inserted, A portion indicated by a thick line is enlarged and shown. The inserted straight wire is naturally driven to a position supported by the wires constituting the lattice network so that the straight line can be easily disposed at the midpoint between the intersections of the lattice networks without requiring a complicated operation. At the intersection of all the wires including the wires constituting the grid network by the insertion of the straight wire, two wires perpendicular to each other must always intersect with each other.

In this case, it is a matter of course that the insertion of the straight wire in the present invention can be performed before the assembly is erected. That is, after inserting the straight wire alternately one by one into the square holes seen in the direction of looking at the lattice network, the laminated body is set up so that the plane formed by the lattice network becomes a vertical plane, It is possible to make the shape of the grating net as shown in Fig. 18 by causing it to move to the position supported by the wire constituting the grating net.

When the insertion of the straight wire in the direction perpendicular to the grid network is completed through the above process, the intersection formed by the insertion of the vertical wire is fixed. For example, application of a metal powder, a viscous binder and flux paste and heating in an appropriate atmosphere can melt the melt and fix the wire intersection. After cooling, the stationary frame, the column and the spacer are separated So that a final truss structure can be manufactured. At this time, it is also possible to fix the intersection of the mesh network in the fixing operation for the intersection formed by inserting the vertical wire together. Figs. 19 (a) and 19 (b) are enlarged views of the final truss structure and parts thereof, and Fig. 19 (c) Fig. 20 shows a shape (a) viewed from a different angle in Fig. 19 (b) and a shape (b) crossing another wire with respect to one wire. As shown in FIG. 20, it can be seen that only two wires cross each other at the intersection of the wires.

Second Embodiment

FIGS. 21 and 22 are views for explaining a process of inserting a spiral wire and fixing an intersection during a manufacturing process of a three-dimensional lattice truss structure according to a second embodiment of the present invention.

The three-dimensional lattice truss structure according to the second embodiment of the present invention is constructed by arranging and fixing a plurality of lattice nets in a fixed frame in the same manner as in the first embodiment to form a helical wire .

That is, the assembled assembly is rotated 90 degrees so that the grating net is perpendicular to the horizontal plane, and the spiral wire is alternately inserted into the small square holes formed in the direction of looking at the grating net. At this time, as in the first embodiment, it is needless to say that the insertion of the helical wire can be performed before erecting the assembly. 21 (a) shows a state in which a part of helical wires is inserted, and Fig. 21 (b) shows a shape viewed from the front of a lattice network in Fig. 21 A portion indicated by a thick line is enlarged and shown. The pitch and helix radius of the inserted helical wire is equal to twice the spacing between the lattice nets and the diameter of the wires constituting the lattice nets. The insertion of the helical wire can be accomplished by rotating the helical wire at the midway point between the wire intersections in the pre-arranged grid and inserting two wires perpendicular to each other at the intersection of all the wires, including the wires constituting the grid. And the plurality of grid meshes are constrained to each other by the newly inserted helical wire so that the whole structure can be maintained without the external support. 22 (a) and 22 (b) are enlarged views of the final truss structure and a part thereof.

The preferred embodiments of the present invention have been described in detail with reference to the drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning, range, and equivalence of the claims are included in the scope of the present invention Should be interpreted.

Claims (8)

In a three-dimensional lattice truss structure composed of a series of wires,
A first straight wire group arranged at regular intervals in parallel on the plane and a second straight wire group superimposed on the first straight wire group so as to have an azimuth angle of 90 degrees and arranged at equal intervals in parallel, A lattice network in which the intersection points of the first straight wire group and the second straight wire group are fixed and form a constant square hole; And a third wire group intersecting the intersection in a direction perpendicular to the lattice network, wherein a three-dimensional lattice truss structure is formed by intersecting two wires at all intersections of the truss structure,
Wherein the lattice nets are arranged in a multi-step manner so as to be parallel to each other at regular intervals in the vertical direction on the plane so that neighboring lattice nets arranged in parallel are moved in parallel by an interval smaller than the pitch of the rectangular holes, Wherein the first straight wire group and the second straight wire group are oriented such that the three-dimensional lattice truss structure is formed so as to be a vertical plane and an X-orientation shape in which the lattice network is viewed is a continuous X- A three-dimensional lattice truss structure. The method according to claim 1,
And the third wire group is composed of a straight wire or a spiral wire. The method according to claim 1,
Wherein the intersection points of the first straight wire group, the second straight wire group, and the third wire group are fixed by any one of joining means selected from the group consisting of soldering, brazing, welding, and resin bonding. Lattice truss structure. The method according to claim 1,
Wherein the first straight wire group, the second straight wire group, and the third wire group are made of at least one material selected from the group consisting of metals, ceramics, composites, and synthetic resins. A method for manufacturing a three-dimensional lattice truss structure,
(a) a first rectilinear wire group arranged in parallel on a plane at regular intervals and a second rectilinear wire group arranged in parallel in the direction perpendicular to the first rectilinear wire group on the first rectilinear wire group Arranging a lattice network in which the intersection points of the first straight wire group and the second straight wire group are fixed and form a constant square hole;
(b) a lattice network having the same structure as that of the lattice network in the step (a) is arranged in parallel in a vertical direction on the plane at regular intervals, and the lattice nets arranged next to each other are spaced apart from each other by Arranging the first straight wire and the second straight wire in parallel to move in the direction of the first straight wire and the second straight wire;
(c) repeating the steps (a) and (b) to form a plurality of lattice nets arranged at regular intervals;
(d) setting the laminates so that the plane formed by the lattice network is a vertical plane and arranging the first straight wire group and the second straight wire so that the shape of the lattice network looks like a continuous X- The third wire is inserted alternately one by one in a square hole viewed in the direction of looking at the lattice nets and the third wire group is inserted between the intersections of the lattice nets in a direction perpendicular to the lattice nets, Intersect; And
(e) fixing an intersection of the first straight wire group and the third wire group and the intersection of the second straight wire group and the third wire group;
And a third truss structure. A method for manufacturing a three-dimensional lattice truss structure,
(a) a first rectilinear wire group arranged in parallel on a plane at regular intervals and a second rectilinear wire group arranged in parallel in the direction perpendicular to the first rectilinear wire group on the first rectilinear wire group Arranging a lattice network in which the intersection points of the first straight wire group and the second straight wire group are fixed and form a constant square hole;
(b) a lattice network having the same structure as that of the lattice network in the step (a) is arranged in parallel in a vertical direction on the plane at regular intervals, and the lattice nets arranged next to each other are spaced apart from each other by Arranging the first straight wire and the second straight wire in parallel to move in the direction of the first straight wire and the second straight wire;
(c) repeating the steps (a) and (b) to form a plurality of lattice nets arranged at regular intervals;
(d) inserting third wires alternately one by one into a square hole viewed in the direction of looking at the mesh, and then forming the stacked body so that the plane formed by the mesh is perpendicular to the mesh, The first linear wire group and the second linear wire group are oriented so as to be in a continuous X-orientation, and the third wire group is arranged between the intersections of the grids in a direction perpendicular to the grids, Intersect; And
(e) fixing an intersection of the first straight wire group and the third wire group and the intersection of the second straight wire group and the third wire group;
And a third truss structure. The method according to claim 5 or 6,
Wherein in the step (d), the third wire group is formed of a straight wire, and the insertion is performed only by translational movement of the third wire. The method according to claim 5 or 6,
Wherein in the step (d), the third wire group is composed of a helical wire, and the insertion is performed by rotationally inserting the third wire.

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