KR101545842B1 - Manufacturing technology of unit-cell structure, a sandwich plate comprising the unit cell structure and its manufacturing method - Google Patents

Abstract

The present invention relates to a truss structure comprising a structural unit cell; A first plate member positioned on a first surface of the truss structure; And a second plate member positioned on a second surface of the truss structure, the structural unit cell comprising: a mesh network; a first plate positioned on a first surface of the mesh network; a second plate member located on a second surface of the mesh network; And a reinforcing member disposed along a side surface of the mesh net, and a method of manufacturing the same. In forming the first plate portion and the second plate portion, a sandwich plate is formed by a 3D printing method, The first plate member and the second plate member are formed on the first surface and the second surface of the truss structure, respectively, so that a separate joining step can be omitted.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a unit cell structure, a sandwich plate including a unit cell structure, and a method for manufacturing the unit cell structure,

The present invention relates to a method of manufacturing a unit cell structure, a sandwich plate including a unit cell structure, and a method of manufacturing the same, and more particularly, to a method of manufacturing a unit cell structure by removing a high temperature heat treatment process, A method of manufacturing a structure, a sandwich plate including a unit cell structure, and a manufacturing method thereof.

The conventional sandwich plate is configured to have a three-dimensional internal structure by using synthetic resin composite material, foam or metal, and non-metal. Such a sandwich panel is manufactured by joining a surface plate material to both upper and lower surfaces of an inner structure of a unit layer.

Particularly, in the case of a ship or a large structure, an I-beam or a corrugate-type structure which is easily produced in the industry has been produced by using the structure as an internal structure. However, there is a problem that such a structure can be over-designed due to the anisotropic characteristics of the structure itself.

In recent years, various types of internal truss structures have been studied as sandwich internal cores. Typical examples are pyramid, octet, and Kagome structures. In the case of an octet truss structure, each element is connected to an equilateral triangle and has a constant mechanical property in all directions.

On the other hand, Korean Patent Laid-Open No. 10-2012-0050573 discloses a sandwich plate using a pyramidal truss structure and a manufacturing method thereof. 1 and 2, a description will be made as follows.

FIG. 1 is a schematic perspective view showing a conventional pyramidal truss structure, and FIG. 2 is a schematic view showing a sandwich plate including the pyramidal truss structure of FIG.

Referring to FIG. 1, a conventional pyramidal truss structure 10 may be formed by joining two structural unit cells, and the structural unit cell includes a leg of a quadrangular pyramid shape extending radially downward, The surface is bent in a plane.

Next, referring to FIG. 2, the sandwich plate including the pyramidal truss structure may be formed by combining the plurality of pyramidal truss structures 10 of FIG. 1 described above between the plates 20. FIG.

More specifically, a plurality of pyramidal truss structures 10 are coupled between a top plate material and a bottom plate material, wherein the plurality of pyramidal truss structures 10 are welded, brazed, transition liquid (TLP) To the plate material.

However, in the case of the conventional sandwich plate material, by using the method such as welding or brazing in joining the plurality of pyramidal truss structures to the plate material, due to the high temperature occurring during the joining process, There is a problem in that the rigidity of the structure is weakened due to a problem caused by the joining.

A problem to be solved by the present invention is to provide a sandwich plate by a simple process without changing the characteristics of the truss structure.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to solve the above-mentioned problems, the present invention provides a truss structure including a structural unit cell; A first plate member positioned on a first surface of the truss structure; And a second plate member positioned on a second surface of the truss structure, the structural unit cell comprising: a mesh network; a first plate positioned on a first surface of the mesh network; a second plate member located on a second surface of the mesh network; And a reinforcing member disposed along the side surface of the mesh net.

The structural unit cell may include a first structural unit cell and a second structural unit cell coupled with the first structural unit cell, and the first structural unit cell may include a first structural unit cell and a first structural unit cell, A first connecting part connecting one end of the first body part and one end of the second body part, a first supporting part located at the other end of the first body part, and a second connecting part connecting the first connecting part and the second connecting part, And a second support unit positioned at the other end of the second body unit, wherein the second structural unit cell includes a first body unit and a second body unit spaced apart from the first body unit by a predetermined distance, A second connecting part connecting one end of the first body part and one end of the second body part, a third supporting part located at the other end of the first body part, and a fourth supporting part located at the other end of the second body part Features sandwich plate The.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising the steps of: forming a first connection groove on a second surface of the first connection portion; and a second connection groove on a second surface of the first support portion, And a fourth coupling groove is formed on a first surface of the second connection portion, and a fifth coupling groove is formed on a first surface of the third support portion, and a second coupling groove is formed on the first surface of the fourth coupling portion, 6 < / RTI > fastening grooves.

Further, the present invention provides a sandwich plate characterized in that the first fastening groove of the first structural unit cell and the fourth fastening groove of the second structural unit cell are mutually fastened to form a truss single structure.

Further, the present invention is characterized in that the truss single structure includes a truss first unity structure and a truss second unity structure, wherein the truss first unity structure and the truss second unity structure each have a first structural unit cell and a second structural unit And a second fastening groove located on a second surface of the first support portion of the first structural unit cell of the truss first unitary structure and a second fastening groove located on the second support unit of the second structural unit cell of the truss second unitary structure A third coupling groove formed on the second surface of the second support portion of the second structural unit cell of the truss first unitary structure and a third coupling groove formed on the second surface of the second structural unit cell of the truss first unitary structure, And the sixth fastening groove located on the first surface of the fourth support portion of the first structural unit cell of the single unit structure is fastened to form the second fastening.

Further, the present invention provides a sandwich plate, wherein the reinforcing member is formed so as to be impregnated into the side surface of the mesh net.

The present invention is characterized in that the width from one end to the other end of the first plate or the width from one end to the other end of the second plate and the width of the side of the mesh net impregnated with the reinforcement are the same To provide a sandwich plate.

The present invention also provides a method of manufacturing a truss structure, comprising: fabricating a truss structure including a structural unit cell; Forming a first plate member on a first surface of the truss structure; And forming a second plate member on a second surface of the truss structure, wherein the structural unit cell comprises a mesh network, a first plate located on a first surface of the mesh network, a second plate on a second surface of the mesh network, And a reinforcing member disposed along the side surface of the mesh net, wherein the reinforcing member is formed by a 3D printing method. The present invention also provides a method of manufacturing a sandwich plate.

Further, the present invention provides a method of manufacturing a sandwich plate, wherein the first plate portion and the second plate portion are formed by 3D printing.

According to another aspect of the present invention, there is provided a method of fabricating a structural unit cell, comprising: providing a plurality of stacked mesh networks; Forming a first plate on a first surface of the laminated mesh network; And forming a second plate material on the second surface of the laminated mesh net, wherein the first plate material and the second plate material are formed by a 3D printing method Of the present invention.

According to the present invention, a plurality of mesh networks are stacked to provide a stacked mesh network, a first plate is formed on a first surface of the stacked mesh network, a second plate is formed on a second surface of the stacked mesh network, Forming a base plate portion; Pressing and processing the base plate portion to form a processed base plate portion; And cutting the processed base plate portion. The present invention also provides a method of manufacturing a structural unit cell.

Further, in the present invention, the first surface is the upper surface portion of the mesh net, the second surface is the lower surface portion of the mesh net, the mesh net includes the side portion, and the reinforcing member is formed on the side surface portion of the mesh net The method comprising the steps of:

According to the present invention, when forming the first plate portion 90a and the second plate portion 90b, the first and second surfaces of the truss structure 70 are formed by 3D printing, Since the first plate member 90a and the second plate member 90b are formed on the surfaces of the first plate member 90a and the second plate member 90b, a separate joining step can be eliminated.

Therefore, the sandwich plate including the truss structure can be formed by a simple process, and a separate joining process such as welding or brazing can be eliminated. Therefore, the high temperature process required in the joining process can be eliminated, It is possible to prevent the characteristic change of the structure.

Further, in the present invention, the base plate member 40 is pressurized to a desired shape to form the processed base plate member 45, and then the processed base plate member is cut into a predetermined shape, It is possible to manufacture a plurality of structural unit cells in accordance with the number of cuts, since the structural unit cells are manufactured by cutting the processed base plate parts.

Further, the present invention reinforces the steel sheet of the mesh net by positioning the reinforcing member along the side surface of the mesh net, which is a constitution of the structural unit cell of the sandwich plate including the truss structure, The rigidity can be reinforced.

FIG. 1 is a schematic perspective view showing a conventional pyramidal truss structure, and FIG. 2 is a schematic view showing a sandwich plate including the pyramidal truss structure of FIG.
3A to 3F are schematic perspective views illustrating a method of manufacturing a structural unit cell according to a first embodiment of the present invention.
4A and 4B are schematic views showing a first structural unit cell according to the present invention.
5A and 5B are schematic views showing a second structural unit cell according to the present invention.
FIG. 6A is a front view showing a truss single structure according to the present invention, and FIG. 6B is a perspective view showing a truss single structure according to the present invention.
7 is a perspective view showing a truss structure in accordance with the present invention.
8A to 8C are schematic views for explaining a method of manufacturing a sandwich plate including a truss structure according to the present invention.
9 is a schematic perspective view for explaining a structural unit cell according to a second embodiment of the present invention.
10 is a comparative view for explaining a reinforcing member according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. &Quot; and / or "include each and every combination of one or more of the mentioned items. ≪ RTI ID = 0.0 >

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" And can be used to easily describe a correlation between an element and other elements. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3A to 3F are schematic perspective views illustrating a method of manufacturing a structural unit cell according to a first embodiment of the present invention.

Referring first to FIG. 3A, a method for fabricating a structural unit cell according to the present invention provides a mesh network 30. FIG.

In this case, the mesh network may be a mesh in which a plurality of wires are arranged in the form of a lattice, and the mesh network 30 'may include a plane portion 31 and a side portion 32.

Next, referring to FIGS. 3B and 3C, a plurality of the mesh meshes 30a, 30b and 30c are provided to provide a meshed mesh net 30, And a second plate member 42 is formed under the mesh network to form a base plate member 40 for forming a structural unit cell.

At this time, in forming the first plate and the second plate, the first plate 41 and the second plate 42 may be formed on the flat portion 31 of the stacked mesh net.

The first and second plates 41 and 42 are positioned on the plane portion of the stacked mesh net, and the side portions 32 of the stacked mesh net are exposed Lt; / RTI >

Although the first plate 41 and the second plate 42 are formed on the planar portions 31 of the stacked mesh net, the side walls 32 of the mesh net The first plate member and the second plate member can be formed.

In this case, the first plate member 41 and the second plate member 42 are positioned on the side surface of the laminated mesh net, and the flat portion 31 of the laminated mesh net is exposed As shown in FIG.

Next, referring to FIG. 3D and FIG. 3E, the base plate member 40 is pressed to be processed into a desired shape to form the processed base plate member 45.

The first jig 43a is positioned on the first plate member 41 side of the base plate member 40 and the second jig 43a is positioned on the first plate member 41 side of the base plate member 40. [ A second jig 43b is positioned on the second plate member 42 of the base plate member 40 and a predetermined force is applied to the first jig 43a so that the base plate member 40 It can be machined to the desired shape.

However, although the shape of the processed base plate portion is simply represented in the drawing, it is also possible to process the shape as shown in FIGS. 4 and 5 according to the shape of the jig.

Next, referring to FIG. 3F, the processed base plate portion is cut into a predetermined shape to manufacture the structural unit cell according to the first embodiment of the present invention.

At this time, cutting of the base plate portion can be performed by a known water jet method or laser cutting method, which is obvious to those skilled in the art, and therefore, a detailed description thereof will be omitted.

In the present invention, the first plate and the second plate may be formed by a 3D printing method, which will be described later.

4A and 4B are schematic views showing a first structural unit cell according to the present invention.

As described above, the first structural unit cell can be manufactured by cutting the processed base plate portion of FIG. 3E described above.

4A and 4B, the first structural unit cell 50 according to the present invention includes a body portion 51 for determining the height of the first structural unit cell 50, and the body portion 51 Includes a first body portion 51a and a second body portion 51b spaced apart from the first body portion 51a by a predetermined distance.

Although the first body portion 51a and the second body portion 51b are shown spaced apart from each other while maintaining a certain angle, the first body portion 51a and the second body portion 51b may be spaced apart from each other, The body portion 51b may be parallel and thus does not limit the separation angle between the first body portion 51a and the second body portion 51b in the present invention.

The first structural unit cell 50 according to the present invention includes a first connection part 53 connecting one end of the first body part 51a and one end of the second body part 51b And may include a first support portion 52a located at the other end of the first body portion 51a and a second support portion 52b located at the other end of the second body portion 51b. have.

The first connection part 53 and the support part 52 may include an upper surface and a lower surface, and may include a fastening groove in a certain area of each upper surface. Meanwhile, the upper surface and the lower surface may be formed in a planar shape to provide a joining surface with a plate material described later.

Herein, the terms top and bottom are for convenience of explanation and, depending on the direction of the drawing, the top surface may be referred to as the bottom surface and the bottom surface may be referred to as the top surface, The upper surface is defined as a first surface, and the lower surface is defined as a second surface.

More specifically, the first coupling portion 53 may include a first coupling groove 54a, and the first coupling portion 52a may include a second coupling groove 54b. And the third support groove 54c may be formed on the first surface of the second support portion 52b.

The first and second surfaces of the first connection portion, the first and second surfaces of the first support portion, and the first and second surfaces of the second support portion may be formed in a planar shape. As shown above.

As described above, the first structural unit cell can be manufactured by cutting the base plate portion of FIG. 3E. Thus, as shown in FIG. 4B, the sectional structure of the first structural unit cell 50 is And corresponds to a structure in which the first plate member 41 and the second plate member 42 are formed on the plane portion of the mesh net 30, respectively.

As described above, the conventional pyramidal truss structure 10 can be formed by joining two structural unit cells, and the structural unit cell includes a leg with a shape of a quadrangular pyramid extending radially downward, Respectively.

At this time, as disclosed in Korean Patent Publication No. 10-2012-0050573, in the conventional case, a plate of a certain thickness is processed to form a structural unit cell.

Therefore, depending on the thickness of the plate material, the strength of the structural unit cell can be improved, but it has been difficult to achieve the weight saving of the final aimed sandwich plate material.

However, in the present invention, when the structural unit cells are formed, the cross-sectional structure may be formed by forming the first plate member 41 and the second plate member 42 on the flat portion of the mesh net 30, It is possible to reinforce the strength through the mesh net located in the inside of the two plate materials, and at the same time to realize the weight reduction of the structural unit cell.

5A and 5B are schematic views showing a second structural unit cell according to the present invention.

As described above, the second structural unit cell can be manufactured by cutting the processed base plate portion of FIG. 3E described above.

5A and 5B, a second structural unit cell 60 according to the present invention includes a body portion 61 for determining the height of the second structural unit cell 60, and the body portion 61 Includes a first body portion 61a and a second body portion 61b spaced apart from the first body portion 61a by a predetermined distance.

The second structural unit cell 60 according to the present invention includes a second connection part 63 connecting one end of the first body part 61a and one end of the second body part 61b And may include a third support portion 62a located at the other end of the first body portion 61a and a fourth support portion 62b located at the other end of the second body portion 61b. have.

The second connection portion 63 and the support portion 62 may include an upper surface and a lower surface, and a certain region of each lower surface may include a fastening groove. Meanwhile, the upper surface and the lower surface may be formed in a planar shape to provide a joining surface with a plate material described later.

Herein, the terms top and bottom are for convenience of explanation and, depending on the direction of the drawing, the top surface may be referred to as the bottom surface and the bottom surface may be referred to as the top surface, The upper surface is defined as a first surface, and the lower surface is defined as a second surface.

More specifically, the second coupling portion 63 may include a fourth coupling groove 64a, and the second coupling portion 62a may include a fifth coupling groove 64b. And a sixth engagement groove 64c may be formed on the second surface of the fourth support portion 62b.

The first and second surfaces of the second connection portion, the first and second surfaces of the third support portion, and the first and second surfaces of the fourth support portion may be formed in a planar shape. As shown above.

Meanwhile, as described above, the second structural unit cell can be manufactured by cutting the processed base sheet material portion of Fig. 3E described above. Therefore, as shown in Fig. 5B, the cross section of the second structural unit cell 60 The structure corresponds to a structure in which the first plate member 41 'and the second plate member 42' are formed on the plane portion of the mesh net 30 '.

FIG. 6A is a front view showing a truss single structure according to the present invention, and FIG. 6B is a perspective view showing a truss single structure according to the present invention.

Referring to FIGS. 6A and 6B, the truss single structure 70 according to the present invention is formed by fastening the first structural unit cell 50 and the second structural unit cell 60 of FIGS. 4 and 5 described above .

4A and 4B, the first structural unit cell 50 is connected to one end of the first body part 51a and one end of the second body part 51b, The first connection part 53 may include a first connection groove 54a formed on a first surface thereof.

5A and 5B, the second structural unit cell 60 includes a first structural unit cell 60a and a second structural unit cell 60b, which connect one end of the first body unit 61a and one end of the second body unit 61b. 2 connecting portion 63 and a fourth connecting groove 64a on the second surface of the second connecting portion 63. [

The first fastening groove 54a of the first structural unit cell 50 and the fourth fastening groove 64a of the second structural unit cell 60 are mutually engaged with each other, (Region A).

In the case of a conventional pyramidal truss structure, as shown in Korean Patent Laid-Open Publication No. 10-2012-0050573, two structural unit cells may be formed by joining together. In this case, in joining two structural unit cells, Brazing method.

However, in the present invention, the first connection groove 53a of the first structural unit cell 50 is formed with the first connection groove 54a, and the second connection unit 63 of the second structural unit cell 60 After the fourth fastening groove 64a is formed, the first fastening groove and the fourth fastening groove are mechanically / physically coupled to each other to firmly couple the first structural unit cell and the second structural unit cell .

6A, the upper surface (first surface) of the first connection unit of the first structural unit cell 50 and the upper surface (first surface) of the second connection unit of the second structural unit cell 60 And the upper surface of the first connection portion and the upper surface of the second connection portion may provide a bonding surface with a plate member described later.

At this time, in the present invention, the upper surface (first surface) of the first connection portion of the first structural unit cell 50 and the upper surface (first surface) of the second connection portion of the second structural unit cell 60 are parallel Since the first fastening groove and the fourth fastening groove are engaged with each other, the first fastening groove and the body fastening groove are engaged with each other by the engagement of the upper surface of the first connection portion and the upper surface of the second connection portion The coupling step can be removed.

7 is a perspective view showing a truss structure in accordance with the present invention.

Referring to FIG. 7, the truss plural structure 80 according to the present invention may be formed by combining a plurality of the truss single structures shown in FIG. 6 described above.

4A and 4B, the first structural unit cell 50 includes a first support portion 52a located at the other end of the first body portion 51a, And a second support portion 52b positioned at the other end of the first support portion 52a and may include a second engagement groove 54b on a first surface of the first support portion 52a, And the third engagement groove 54c may be formed on the first surface of the support portion 52b.

The second structural unit cell 60 includes a third support portion 62a located at the other end of the first body portion 61a and a fourth support portion 62a located at the other end of the second body portion 61b. And a second fastening groove 64b may be formed on the second surface of the third support portion 62a and a second fastening groove 64b may be formed on the second surface of the fourth support portion 62b, (64c).

Referring to FIG. 7, the truss multi-structure 80 may be formed by combining a truss first unitary structure 70 'and a truss second unitary structure 70' '.

More specifically, the second fastening groove located on the first surface of the first support of the first structural unit cell 50 'of the truss first unitary structure 70' and the second fastening groove of the truss second unitary structure 70 " The fifth fastening groove located on the second surface of the third support of the second structural unit cell 60 " may be fastened to form the first fastening B1.

Also, a third fastening groove located on the second side of the second support of the second structural unit cell 60 'of the truss first unitary structure 70' and a first fastening groove on the second side of the truss second unitary structure 70 ' The sixth fastening groove located on the first surface of the fourth support of the structural unit cell 50 " may be fastened to form the second fastening B2.

As disclosed in Korean Patent Laid-Open No. 10-2012-0050573, in the case of a conventional pyramidal truss structure, two structural unit cells can be joined to form a pyramidal truss single structure, and the pyramidal truss single structures They are individually joined to the later-described plate material without being fastened.

However, in the present invention, the truss first unitary structure 70 'and the truss second unitary structure 70' ', that is, a plurality of truss single structures are mutually coupled by a mechanical / physical method, .

7, the lower surface (second surface) of the first support portion of the first structural unit cell 50 'of the truss first unitary structure 70' and the lower surface (second surface) of the truss second unitary structure 50 ' (Second surface) of the third support portion of the second structural unit cell 60 " of the second structural unit cell 70 " is parallel, and the lower surface of the first support portion and the lower surface The surface can provide a bonding surface with a plate member described later.

In addition, the lower surface (second surface) of the second support portion of the second structural unit cell 60 'of the truss first unitary structure 70' and the first structural unit cell 70 '' of the truss second unitary structure 70 ' The lower surface of the second support portion and the lower surface of the fourth support portion are provided with a bonding surface to be described later with respect to the plate member, can do.

 This is the same as the area A in FIG. 6A described above, and a detailed description thereof will be omitted below.

8A to 8C are schematic views for explaining a method of manufacturing a sandwich plate including a truss structure according to the present invention.

First, referring to FIG. 8A, the sandwich plate 100 including the truss structure forms an upper plate trimming portion 90a on the upper surface of the truss single structure of FIGS. 6A and 6B. However, for the sake of convenience of explanation, the terms of the upper surface and the upper plate portion are merely terms for distinguishing the upper portion and the lower portion based on FIG. 8A. However, the terms are not limited to the terms of the upper surface or the upper plate portion in the present invention, May be replaced with the terms of the first sheet or the first sheet portion.

8A to 8C, the sandwich plate according to the present invention includes the truss single structure shown in FIGS. 6A and 6B. Alternatively, the sandwich plate may include a truss multiple structure.

Hereinafter, in the present invention, the terms of the truss structure are used to mean simultaneously including the truss single structure and the truss multiple structure. That is, the truss structure means a truss single structure and a truss plural structure.

8A, a first plate member is formed on a first surface of the truss structure 70. In the present invention, the first plate member 90a is formed by a 3D printing method .

As is well known, the 3D printing method corresponds to a technique of printing through three-axis movement of X axis, Y axis and Z axis in comparison with the conventional 2D printing method of printing through two-axis motion of the X axis and Y axis.

In the 3D printing method, there are various printing methods according to a method of forming a lamination method or a form, for example, a rapid forming method and an FDM method.

The rapid prototyping method corresponds to a method in which a three-dimensional design is performed by software, and then a three-dimensional printing is performed by stacking layers of hardened powders or liquids in layers. FDM (Fused Deposition Modeling) And the material which has been changed to the state is sequentially stacked.

However, the present invention does not limit the type of the 3D printing method, and a first plate member according to the present invention can be formed using a known 3D printer.

Other information about the 3D printing method can be found in the following documents.

- 3D printing technology - ASTM F43 sub-committee on terminology (F2792)

- Large, Hollow Metal Parts by 3D Printing - Copyright 1989-2000, 3DPTM Laboratory, MIT

Referring to FIG. 8A, the first plate member 90a is manufactured using a selective laser sintering (SLS) method in the 3D printing method.

That is, the powder is supplied through the powder feeder 92, which supplies the raw material in the powder state, and the laser is supplied to the powder through the light source providing unit 91 to change the powder into the molten state, The plate member 90a can be formed.

Meanwhile, the raw materials provided from the powder feeder 92 can be the raw materials as shown in Table 1 (raw material source: company name: EOS GmbH - Electro Optical Systems). However, in the present invention, But it is possible to make different kinds of raw materials according to need.

material Stainless Steel 17-4 (GP1) Stainless Steel 15-5 (PH1) Cobalt Chrome (MP1) Maraging Steel (MS1) (Tooling Steel) Titanium Alloy (Ti64) Aluminum (AlSi10mg) Nickel Alloy (IN625) (Inconel) Nickel Alloy (IN718) (Inconel)

Next, referring to FIGS. 8B and 8C, a second plate member 90b is formed on a second surface of the truss structure 70, thereby forming a sandwich plate including the truss structure.

Meanwhile, in the present invention, the second plate member 90b is formed by 3D printing. Since this is the same as the above-described first plate member, a detailed description will be omitted below.

The present invention is also characterized in that the first plate member 41 and the second plate member 42 are formed on the flat surface portion 31 of the laminated mesh net shown in FIG. 3B by the 3D printing method This is the same as the above-described first plate portion, and therefore, a detailed description thereof will be omitted.

As described above, in the case of the conventional sandwich plate, by using the method such as welding or brazing in joining the plurality of pyramidal truss structures to the plate material, due to the high temperature generated during the joining process, There is a problem in that the rigidity of the structure is weakened due to a problem due to the joining.

However, in the present invention, when forming the first plate portion 90a and the second plate portion 90b, the first and second surfaces of the truss structure 70 are formed by the 3D printing method, Since the first plate member 90a and the second plate member 90b are formed, a separate joining step can be eliminated.

Therefore, the sandwich plate including the truss structure can be formed by a simple process, and a separate joining process such as welding or brazing can be eliminated. Therefore, the high temperature process required in the joining process can be eliminated, It is possible to prevent the characteristic change of the structure.

3, the base plate member 40 is pressurized to a desired shape to form the processed base plate member 45, and then the processed base plate member is cut into a predetermined shape The structural unit cell according to the present invention can be manufactured by cutting the processed base plate member into a plurality of structural unit cells according to the number of cuts, .

9 is a schematic perspective view for explaining a structural unit cell according to a second embodiment of the present invention.

The structural unit cell according to the second embodiment of the present invention may be the same as the structural unit cell of the first embodiment described above, except as described below.

Referring to FIG. 9, the structural unit cell according to the second embodiment of the present invention fabricates the structural unit cell of the first embodiment through the processes of FIGS. 3A to 3F.

The structure unit cell of the first embodiment corresponds to the structure in which the first plate member 41 and the second plate member 42 are formed on the flat surface portion 31 of the laminated mesh network, as described above.

The structural unit cell according to the second embodiment of the present invention includes reinforcing members 47 and 48 on the surface portion of the mesh net 30.

The reinforcing members 47 and 48 may be made of the same material or different materials as the first and second plate members. In the present invention, the reinforcing members 47 and 48 may be formed by a 3D printing method .

10 is a comparative view for explaining a reinforcing member according to the present invention.

Referring to FIG. 10, the reinforcing members 47 and 48 will be described in detail with reference to the cross-sectional view taken along the line II in FIG. 3F. In the first structural unit cell 46 according to the first embodiment of the present invention The first plate member 41 and the second plate member 42 are formed on the plane portion of the mesh net 30, respectively.

9, a second structural unit cell 46 'according to the present invention includes a first plate member 41 and a second plate member 41 on the flat surface of the mesh net 30, Reinforcing members 47 and 48 are formed on the side surfaces of the mesh net 30, respectively.

9 and 10, the second structural unit cell according to the present invention includes a mesh network 30, and the mesh network includes an upper surface portion, a lower surface portion and a side surface portion, The second plate member 42 is positioned on the lower surface of the mesh net and the reinforcing members 47 and 48 are disposed on the side surface of the mesh net. have.

In this case, the terms top and bottom are used for convenience of explanation. The top surface may be referred to as a bottom surface portion, and the bottom surface portion may be referred to as a top surface portion according to the direction of the drawing. The first surface and the bottom surface may be defined as a second surface, and the surface excluding the first surface and the second surface may be defined as a side surface portion.

That is, in order to reinforce the rigidity of the mesh net, the reinforcement members 47 and 48 may be positioned along side portions of the mesh net.

At this time, it is preferable that the reinforcement members 47 and 48 are formed so as to be impregnated into the side surface of the mesh net.

When the reinforcing member is impregnated into the side surface of the mesh net, the depth dl of the reinforcing member is not limited, but the width W1 from one end to the other end of the first plate 41, The width W1 from one end to the other end of the reinforcing member 42 and the width W1 of the side surface of the mesh net impregnated with the reinforcing member 33 are preferably the same.

As described above, in the present invention, the first structural unit cell can be manufactured by cutting the base plate member of the above-described FIG. 3B, and the rigidity of the mesh network of the first structural unit cell can be reinforced through the reinforcing member have.

At this time, in order to reinforce the rigidity of the mesh network of the standardized first structural unit cell, in positioning the reinforcement member in the side surface portion of the mesh net, as the reinforcement member is positioned, It is preferable that the reinforcing member is formed so as to be impregnated into the side surface portion of the mesh net.

The width W1 from one end to the other end of the first plate member 41 or the width W1 from one end to the other end of the second plate member 42, By making the width W1 of the side portions of the net the same, it is possible to prevent the specification of the first structured unit cell, which has been cut and cut, from being varied by the reinforcing member.

Meanwhile, in the present invention, the reinforcing member may be formed by a 3D printing method, which has been described above, and thus a detailed description thereof will be omitted.

As described above, according to the present invention, the reinforcing member is disposed along the side surface of the mesh net, which is a constitution of the structural unit cell of the sandwich plate including the truss structure, thereby reinforcing the steel net of the mesh net, The rigidity of the plate material can be reinforced.

Meanwhile, it is a matter of course that the structural unit cell according to the second embodiment of the present invention can be replaced with the structural unit cell of Figs.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (12)

A truss structure comprising structural unit cells;
A first plate member positioned on a first surface of the truss structure; And
And a second plate member positioned on a second surface of the truss structure,
Wherein the structural unit cell comprises:
A first plate located on a first surface of the mesh network, a second plate disposed on a second surface of the mesh network, and a reinforcing member located along a side surface of the mesh network,
Wherein the structural unit cell includes a first structural unit cell and a second structural unit cell coupled with the first structural unit cell,
The first structural unit cell includes a first body portion and a second body portion spaced apart from the first body portion by a predetermined distance. The first structural unit cell includes a first structural unit cell, a second structural unit cell, A first support portion located at the other end of the first body portion, and a second support portion located at the other end of the second body portion,
The second structural unit cell includes a first body portion and a second body portion spaced apart from the first body portion by a predetermined distance. The second structural unit cell includes a second body unit, a second body unit, And a fourth support portion located at the other end of the second body portion. The sandwich plate according to any one of claims 1 to 5, wherein the first support portion includes a connection portion, a third support portion located at the other end of the first body portion, and a fourth support portion located at the other end of the second body portion. delete The method according to claim 1,
And a second coupling groove formed on a lower surface of the first supporting portion and a third coupling groove formed on a lower surface of the second supporting portion,
And a fourth fastening groove is formed on an upper surface of the second connecting portion and a fifth fastening groove is formed on an upper surface of the third supporting portion and a sixth fastening groove is formed on an upper surface of the fourth supporting portion. Sandwich plate. The method of claim 3,
Wherein the first fastening groove of the first structural unit cell and the fourth fastening groove of the second structural unit cell are mutually engaged to form a truss unitary structure. 5. The method of claim 4,
Wherein the truss uni-structure comprises a truss first uni-structure and a truss second uni-structure,
Wherein the truss first unity structure and the truss second unity structure each include a first structural unit cell and a second structural unit cell,
A second fastening groove located on the second surface of the first support portion of the first structural unit cell of the truss first uni-structure and a second fastening groove located on the first surface of the third support portion of the second structural unit cell of the truss structure, The first fastening groove is fastened to the first fastening groove,
A third fastening groove located on the second surface of the second support portion of the second structural unit cell of the truss first uni-structure and a second fastening groove located on the first surface of the fourth support portion of the first structural unit cell of the truss second uni- And the second fastening groove is fastened to form the second fastening groove. The method according to claim 1,
Wherein the reinforcing member is formed so as to be impregnated into the side surface of the mesh net. The method according to claim 6,
Wherein a width from one end to the other end of the first plate or a width from one end to the other end of the second plate is equal to a width of a side portion of the mesh net impregnated with the reinforcement. Fabricating a truss structure comprising a structural unit cell;
Forming a first plate member on a first surface of the truss structure; And
And forming a second plate member on a second surface of the truss structure,
Wherein the structural unit cell comprises:
A first plate located on a first surface of the mesh network, a second plate disposed on a second surface of the mesh network, and a reinforcing member located along a side surface of the mesh network,
Wherein the reinforcing member is formed by a 3D printing method. 9. The method of claim 8,
Wherein the first plate member and the second plate member are formed by a 3D printing method. 9. The method of claim 8,
The method for fabricating the structural unit cell comprises:
Providing a plurality of stacked mesh networks; Forming a first plate on a first surface of the laminated mesh network; And forming a second plate material on the second surface of the laminated mesh network,
Wherein the first plate and the second plate are formed by a 3D printing method. delete delete

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