Cell structure, plate lattice structure and construction method

Abstract

The present application belongs to the field of additive manufacturing technology, and discloses a cell structure, a plate-like lattice structure and a construction method. The cell structure includes three rectangular plates, which are arranged orthogonally to divide the three-dimensional space into eight regions. Each region has a hollow tetrahedron, and one vertex of the hollow tetrahedron coincides with the O point where the three rectangular plates intersect. Each of the regions has three A points, which are respectively located on the three rectangular plates, and each A point is arranged diagonally with the O point. The other three vertices of the hollow tetrahedron coincide with the three A points in the corresponding region. The plate-like lattice structure is formed by a periodic array of several cell structures along the left-right, front-back and up-down directions in three-dimensional space; the cell structure, plate-like lattice structure and construction method of the present application have simple structural design, strong feasibility, and higher strength and rigidity than the lattice lattice structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing, and in particular relates to a cell structure, a plate lattice structure and a construction method. Background Art

[0002] In recent years, the industry's strict requirements for lightweight, low fuel consumption and high payload have led to an increasing demand for foamed metals in the aerospace and automotive industries. Foamed metals can be divided into two types: random foams and periodic lattice structures. Currently, the common lattice structures mainly include body-centered cubic (BCC) and face-centered cubic (FCC) based on rods, and truss-based topological structures, including cubes, octahedral trusses, and diamond structures. However, these structures are anisotropic and have poor stability. They are prone to stress concentration at the joints and premature failure, which seriously affects their development and application in the industry.

[0003] Therefore, the existing technology needs to be improved and developed. Summary of the invention

[0004] The purpose of the present application is to provide a cellular structure, a plate lattice structure and a construction method, which have a simple structural design, strong feasibility, and higher strength and rigidity.

[0005] In the first aspect, the present application provides a cell structure, comprising three rectangular plates, which are orthogonally arranged to divide the three-dimensional space into eight regions, each of which has a hollow tetrahedron, and one vertex of the hollow tetrahedron coincides with the point O where the three rectangular plates intersect, and each of the regions has three points A, which are respectively located on the three rectangular plates, each of the point A is diagonally arranged with the point O, and the other three vertices of the hollow tetrahedron respectively coincide with the three points A in the corresponding regions.

[0006] The cell structure provided in the present application is designed with three rectangular plates arranged orthogonally, and a hollow tetrahedron is arranged in each area separated by the rectangular plates, so that when the cell structure is subjected to external force loads, the rectangular plates stabilize and reinforce the cell structure, thereby improving the strength and rigidity of the cell structure.

[0007] Furthermore, the above hollow tetrahedron is a hollow regular tetrahedron.

[0008] The cell structure provided in the present application uses three rectangular plates to divide the three-dimensional space into eight virtual cube areas. The hollow tetrahedrons in each virtual cube area are regular tetrahedrons, so that the cell structure has a symmetrical structure, so that the force in all directions is equal when subjected to external force loads, reducing anisotropy and improving the stability of the cell structure.

[0009] Furthermore, at least one of the four triangular faces of the hollow tetrahedron is provided with a first through hole; and in each of the regions, a horizontal rectangular plate among the three rectangular plates is provided with at least one second through hole.

[0010] The present application converts the closed-cell structure of the cell structure into an open-cell structure by opening a first through hole and a second through hole, thereby facilitating the subsequent cleaning and discharge of the internal powder.

[0011] Furthermore, the shapes of the first through hole and the second through hole are circular or polygonal.

[0012] Furthermore, the center of circle or centroid of the above-mentioned first through hole coincides with the centroid of the triangular face in which it is located; the edge lines of the hollow tetrahedron in each of the said regions divide the horizontal rectangular plate surface in the corresponding said region into two triangles, and the center of circle or centroid of the second through hole coincides with the centroid of the said triangle.

[0013] The present application designs the center of the circle or the center of gravity of the first through hole and the second through hole to coincide with the center of gravity of the triangular face in which they are located. According to the center of gravity of the triangle, when opening the hole, the center of the circle or the center of gravity of the first through hole and the center of gravity of the triangle are always kept in a straight line, and the center of the circle or the center of gravity of the second through hole and the center of gravity of the triangle are always kept in a straight line. The first through hole and the second through hole can be opened quickly, and the opening of the through holes in this way can minimize the impact of the opening structure on the strength and stiffness of the cell structure, thereby ensuring the stability of the cell structure.

[0014] Furthermore, when the first through hole is circular, its diameter ranges from 1 / 6 to 1 / 4 of the longest side length of the rectangular plate; when the first through hole is polygonal, the diameter range of the circumscribed circle of the first through hole is 1 / 6 to 1 / 4 of the longest side length of the rectangular plate; when the second through hole is circular, its diameter ranges from 1 / 8 to 1 / 5 of the longest side length of the rectangular plate; when the second through hole is polygonal, the diameter range of the circumscribed circle of the second through hole is 1 / 8 to 1 / 5 of the longest side length of the rectangular plate.

[0015] The present application designs the diameter of the first through hole and the diameter of the second through hole, thereby making the area of ​​the through hole larger without affecting the strength and rigidity of the cell structure, so as to facilitate the subsequent discharge of internal powder.

[0016] In a second aspect, the present invention provides a plate-like lattice structure, which is formed by a plurality of the above-mentioned cell structures arranged periodically in a three-dimensional space in the left-right, front-back, and up-down directions.

[0017] The present application uses a single cell structure as a basic unit for periodic arraying, and while the strength and stiffness of the single cell structure are improved, the strength and stiffness of the plate-like lattice structure are also improved.

[0018] In a third aspect, the present invention provides a method for constructing a cell structure, comprising the following steps:

[0019] Establish a spatial rectangular coordinate system;

[0020] Taking the coordinate origin O of the spatial rectangular coordinate system as the center, rectangular plates with predetermined thickness and side length are constructed in the XOY plane, the XOZ plane and the YOZ plane respectively, and the three rectangular plates are orthogonally arranged to divide the three-dimensional space into eight virtual rectangular blocks;

[0021] Select any one of the virtual cuboids, select three vertices on the XOY plane, the XOZ plane, and the YOZ plane that are diagonal to the coordinate origin O, and connect the coordinate origin O and the three vertices in pairs to form a hollow tetrahedron;

[0022] The hollow tetrahedron is also formed in the other seven virtual cuboids to construct the cell structure.

[0023] The present invention constructs a cellular structure through the above-mentioned construction method, the construction process is simple, the feasibility is strong, and the designed structure can be constructed quickly and accurately.

[0024] Furthermore, after the cell structure is constructed as described above, the following steps are also included: a first through hole is opened on at least one of the four triangular faces of the hollow tetrahedron, and at least one second through hole is opened on the XOY plane in each of the virtual cuboids; the center of the circle or the center of gravity of the first through hole coincides with the center of gravity of the triangular face where it is located; the center of the circle or the center of gravity of the second through hole coincides with the center of gravity of the triangles divided by the edges of the hollow tetrahedron in the XOY plane.

[0025] The present invention uses the center of gravity of the surface where the first through hole and the second through hole are located as the center of the circle or the center of gravity of the through hole, which not only facilitates the positioning of the through hole, but also does not affect the stability of the original cell structure after the through hole is opened.

[0026] In a fourth aspect, the present invention provides a method for constructing a plate-like lattice structure, which includes the steps of the above-mentioned method for constructing a cell structure, and also includes the following steps: using the cell structure as a basic unit, and performing periodic arrays along the X-axis, Y-axis and Z-axis directions of the spatial rectangular coordinate system to construct a plate-like lattice structure.

[0027] From the above, it can be seen that the cell structure, plate lattice structure and construction method of the present invention, through the design of orthogonal arrangement of three rectangular plates, make the rectangular plates perpendicular to each other bear external force loads. At the same time, by coinciding the vertices of the hollow tetrahedrons surrounding the rectangular plates with the vertices of the rectangular plates, when the rectangular plates are subjected to external force loads, the cell structure can be stabilized and reinforced, thereby improving the strength and rigidity of the plate lattice structure, thereby ensuring the stability of the plate lattice structure.

[0028] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of the cell provided in an embodiment of the present application.

[0030] Figure 2 A schematic diagram of the structure of the plate-like lattice structure provided in an embodiment of the present application.

[0031] Figure 3 A flowchart for constructing a cell structure provided in an embodiment of the present application.

[0032] Figure 4 This is a schematic diagram of the structure of the first intermediate provided in an embodiment of the present application.

[0033] Figure 5 This is a schematic diagram of the structure of the second intermediate provided in an embodiment of the present application.

[0034] Figure 6 This is a schematic diagram of the structure of the third intermediate provided in the examples of the present application.

[0035] Figure 7 A schematic diagram of the structure of the final body provided in the embodiment of the present application.

[0036] Figure 8 A flow chart for constructing a plate-like lattice structure provided in an embodiment of the present application.

[0037] Fig. 9 A curve chart comparing the compression performance of the plate lattice structure provided in the embodiment of the present application and other lattice lattice structures.

[0038] Fig.10 A comparison curve of the compression performance of plate-like lattice structures of different thicknesses provided in the embodiments of the present application.

[0039] Fig.11 A comparative curve chart of the compression performance of the plate-like lattice structure with through holes of different sizes provided in the embodiments of the present application.

[0040] Explanation of reference numerals: 1, rectangular parallelepiped plate; 11, hollow tetrahedron; 111, first through hole; 112, second through hole. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0045] like Figure 1 As shown, a cell structure provided by the present invention includes three rectangular plates 1, and the three rectangular plates 1 are orthogonally arranged to divide the three-dimensional space into eight regions. Each region has a hollow tetrahedron 11, and a vertex of the hollow tetrahedron 11 coincides with the point O where the three rectangular plates 1 intersect. Each region has three points A, and the three points A are respectively located on the three rectangular plates, and each point A is arranged diagonally with the point O, and the other three vertices of the hollow tetrahedron coincide with the three points A in the corresponding region.

[0046] Through this technical solution, when subjected to external force load, the rectangular plate 1 can stabilize and reinforce the cell structure, improve the strength and rigidity of the cell structure, and thus ensure the stability of the plate-like lattice structure.

[0047] In some preferred embodiments, the three mutually perpendicular rectangular plates 1 divide the three-dimensional space into eight virtual cube regions, and the hollow tetrahedrons 11 in each virtual cube region are all hollow regular tetrahedrons, so that the cell structure has a symmetrical structure, and when subjected to force, the forces in all directions are equal, the anisotropy is minimized, and the stability is strong.

[0048] In some preferred embodiments, at least one of the four triangular faces of the hollow tetrahedron 11 is provided with a first through hole 111; in each region, the horizontal rectangular plate of the three rectangular plates 1 is provided with at least one second through hole 112. The present application converts the closed-cell structure of the cell structure into an open-cell structure by respectively providing the first through hole 111 and the second through hole 112 on the triangular face and the horizontal rectangular plate, so as to facilitate the cleaning and discharge of the internal powder after the subsequent laser selective melting forming. The specific cleaning method can be to use a high-pressure air gun driven by a mechanical arm to blow air so that the powder is discharged from the first through hole 111 and the second through hole 112; it can also be to use a cleaning method so that the cleaning liquid flushes out the internal powder; it can also be cleaned by ultrasonic waves to accelerate the discharge of the internal powder by vibration. Specifically, the four triangular faces of the hollow tetrahedron 11 are provided with a first through hole 111, and the horizontal rectangular plate of the three rectangular plates 1 in each region is provided with two second through holes 112. In this way, compared with only one through hole, the discharge speed of the powder is faster, and the cleaning speed is improved. Specifically, the horizontal rectangular plate is the rectangular plate 1 among the three rectangular plates 1 which is parallel to the horizontal plane.

[0049] In some preferred embodiments, the shapes of the first through hole 111 and the second through hole 112 are circular or polygonal. In specific applications, when the through hole is designed as a polygon, preferably, the polygon is a regular polygon, so that the influence of irregular polygons on the strength of the cell structure can be reduced.

[0050] In some preferred embodiments, the center of the circle or the center of gravity of the first through hole 111 coincides with the center of gravity of the triangular face where it is located; the edges of the hollow tetrahedron in each region divide the horizontal rectangular parallelepiped plate surface in the corresponding region into two triangles, and the center of the circle or the center of gravity of the second through hole coincides with the center of gravity of the triangle. In specific applications, by designing the center of the circle or the center of gravity of the first through hole 111 and the second through hole 112 to coincide with the center of gravity of the triangular face where they are located, it is convenient to open the through hole, and opening the through hole in this way can minimize the influence of the opening structure on the strength and stiffness of the cell structure, thereby ensuring the stability of the cell structure.

[0051] In some preferred embodiments, when the first through hole 111 is circular, its diameter ranges from 1 / 6 to 1 / 4 of the longest side of the rectangular plate 1; when the first through hole 111 is polygonal, the diameter range of the circumscribed circle of the polygonal first through hole 111 is from 1 / 6 to 1 / 4 of the longest side of the rectangular plate 1; when the second through hole 112 is circular, its diameter ranges from 1 / 8 to 1 / 5 of the longest side of the rectangular plate 1; when the second through hole 112 is polygonal, the diameter range of the circumscribed circle of the polygonal second through hole 112 is from 1 / 8 to 1 / 5 of the longest side of the rectangular plate 1. Through this technical solution, without affecting the strength and rigidity of the cell structure, the aperture of the through hole is made larger. The larger the aperture, the smoother the internal powder discharge, that is, the faster the discharge speed and the higher the cleaning efficiency. In this embodiment, the shapes of the first through hole 111 and the second through hole 112 are preferably circular. When the diameter of the circular through hole is the same as the diameter of the circumscribed circle of the polygonal through hole, the circular through hole has a larger area than the polygonal through hole, which is more conducive to the discharge of powder.

[0052] like Figure 2 As shown, the present invention provides a plate-like lattice structure, which is formed by a plurality of the above-mentioned cell structures arranged periodically in a three-dimensional space in the left-right, front-back, and up-down directions.

[0053] Through this technical solution, several cell structures are combined into a plate lattice structure. When the plate lattice structure is subjected to force, the force is dispersed to several cell structures, so that the strength and stiffness of the plate lattice structure are improved. Compared with the octahedral truss lattice structure (Octet truss) and the rod-based body-centered cubic lattice structure (BCC) with the same relative density, the compressibility can be more than twice that of the octahedral truss lattice structure (Octet truss) and the rod-based body-centered cubic lattice structure (BCC).

[0054] like Figure 3 As shown, the present invention provides a method for constructing a cell structure, which is used to construct the above-mentioned cell structure, and comprises the following steps:

[0055] S10: Establishing a spatial rectangular coordinate system;

[0056] S20: With the coordinate origin O of the spatial rectangular coordinate system as the center, a rectangular plate 1 with a predetermined thickness and side length is constructed in the XOY plane, the XOZ plane and the YOZ plane respectively. The three rectangular plates 1 are orthogonally arranged to divide the three-dimensional space into eight virtual rectangular blocks, and the following is obtained: Figure 4 The first intermediate shown;

[0057] S30: Select any virtual cuboid, select three vertices on the XOY plane, the XOZ plane and the YOZ plane that are diagonal to the coordinate origin O, connect the coordinate origin O and the three vertices in pairs to form a hollow tetrahedron 11, and obtain Figure 5 The second intermediate shown;

[0058] S40: A hollow tetrahedron 11 is also formed in the other seven virtual cuboids to construct a cell structure, and the following is obtained: Figure 6 The third intermediate is shown.

[0059] In some preferred embodiments, the method for constructing a cell structure further comprises the following steps:

[0060] S50: In each virtual cuboid, a first through hole 111 is provided for at least one of the four triangular faces of the hollow tetrahedron 11, and at least one second through hole 112 is provided for the XOY plane in each virtual cuboid; the center of the first through hole 111 is the centroid of the face on which it is located; the center of the second through hole 112 is the centroid of the triangles into which the XOY plane in the corresponding virtual cuboid is divided by the edges of the hollow tetrahedron 11; and the following is obtained: Figure 7 The final body shown is a cell structure with through holes.

[0061] The cellular structure is constructed by the above construction method, the construction process is simple, the feasibility is strong, and the designed structure can be constructed quickly and accurately.

[0062] like Figure 8 As shown, a method for constructing a plate-like lattice structure provided by the present invention is used to construct the above-mentioned plate-like lattice structure, which includes steps S10-S50 of the cell structure construction method, and further includes the following steps:

[0063] S60: Using the constructed cell structure as a basic unit, periodically arraying along the X-axis, Y-axis and Z-axis directions of the spatial rectangular coordinate system to construct a plate-like lattice structure. Specifically, the X-axis, Y-axis and Z-axis directions are left-right, front-back and up-down directions in the three-dimensional space.

[0064] The following is a further example of the construction method of the plate lattice structure:

[0065] Example 1

[0066] S100: Establishing a spatial rectangular coordinate system;

[0067] S200: With the coordinate origin O of the spatial rectangular coordinate system as the center, a rectangular plate 1 with a thickness of 5 mm and a side length of 100 mm is constructed in the XOY plane, the XOZ plane and the YOZ plane respectively. The three rectangular plates 1 are orthogonally arranged to divide the three-dimensional space into eight virtual cubes;

[0068] S300: Select any virtual cube, select three vertices on the XOY plane, the XOZ plane, and the YOZ plane that are diagonal to the coordinate origin O, and connect the coordinate origin O and the three vertices in pairs to form a hollow regular tetrahedron;

[0069] S400: A hollow tetrahedron is also formed in the other seven virtual cubes to construct a cell structure;

[0070] S500: A first through hole 111 with a diameter of 25 mm is opened on each of the four triangular faces of the hollow regular tetrahedron, and two second through holes 112 with a diameter of 18 mm are opened on the XOY plane in the virtual cube of each workstation; that is, a total of 32 first through holes 111 are opened in the eight hollow regular tetrahedrons, and a total of 8 second through holes 112 are opened in each cell structure; the center of the first through hole 111 is the centroid of the triangular face where it is located; the centers of the two second through holes 112 are respectively the centroids of the two triangles into which the XOY plane in the corresponding virtual cube is divided by the edges of the hollow tetrahedron 11.

[0071] S600: Taking a constructed cell structure as a basic unit, periodically arraying along the X-axis, Y-axis and Z-axis directions of a spatial rectangular coordinate system to construct a plate-like lattice structure.

[0072] The constructed plate lattice structure (Plate lattice) and the cubic lattice structure (Cubic), octahedral truss lattice structure (Octet truss) and body-centered cubic lattice structure (BCC) with the same relative density were processed with three-dimensional model data respectively, and formed based on the laser selective melting technology of powder bed melting to obtain a plate lattice structure entity, a cubic lattice structure entity, an octahedral truss lattice structure entity and a body-centered cubic lattice structure entity. The compression performance comparison test was carried out using a universal material testing machine. The compression speed of the universal material testing machine was set to 1mm / min (millimeter per minute). The universal material testing machine automatically recorded the load and displacement data, and finally formed as shown in the figure. Fig. 9 The compression performance comparison curve shown is composed of Fig. 9 It can be seen intuitively that in the initial linear elastic stage, the elastic modulus (ratio of compressive stress to compressive strain) of the plate-like lattice structure is greater than that of the other three comparative lattice structures. The compressive stress (strength) of the other three lattice structures reaches its maximum value at a compressive strain (Compress Strain) below 10%, while the compressive stress (strength) of the plate-like lattice structure does not reach its maximum value at a compressive strain of 10%. The compressive stress (strength) tends to be stable at a compressive strain of 20%-50%, and gradually increases at a compressive strain greater than 50%. After the test, it was concluded that the compressive strength of the plate-like lattice structure is about 2.4 times that of the other three comparative crystal structures.

[0073] It should be noted that the above-mentioned same relative density means that the plate lattice structure has the same size side length as the cubic lattice structure, the octahedral truss lattice structure and the body-centered cubic lattice structure, and the same volume. In other words, the experiment is carried out under the condition that the control variables of the plate lattice structure, the cubic lattice structure, the octahedral truss lattice structure and the body-centered cubic lattice structure are the same, and the only difference is the structure. In this way, the accuracy and scientificity of the experimental data are guaranteed.

[0074] Example 2

[0075] The difference between this example and Example 1 is that the thickness of the rectangular plate 1 constructed in the XOY plane, XOZ plane and YOZ plane in step S200 of this example is 10 mm. Fig.10 The curve diagram shown by Fig.10 It can be seen intuitively that the greater the thickness of the rectangular plate 1, the greater its rigidity. That is to say, in a specific application, the thickness of the rectangular plate 1 can be adaptively selected according to actual needs to meet the rigidity requirements.

[0076] Example 3

[0077] The difference between this example and Example 1 is that in step S500 of this example, the diameter of the first through hole 111 opened on the four triangular faces of the hollow regular tetrahedron is 18 mm, and the diameter of the second through hole 112 opened on the XOY plane in each virtual cube is 12.5 mm. Fig.11 The curve diagram shown by Fig.11 It can be seen intuitively that the size of the through hole has little effect on the stiffness and strength. In other words, in specific applications, under the premise of meeting the stiffness and strength requirements, the aperture size of the through hole can be designed as large as possible, so that the internal powder can be discharged at the fastest discharge speed during subsequent cleaning, thereby improving the cleaning efficiency.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0079] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A cell structure comprising three rectangular plates, characterized in that: The three rectangular plates are orthogonally arranged to divide the three-dimensional space into eight regions, each of which has a hollow tetrahedron, one vertex of which coincides with the point O where the three rectangular plates intersect, and each of which has three points A, which are located on the three rectangular plates, respectively, and each point A is arranged diagonally with the point O, and the other three vertices of the hollow tetrahedron coincide with the three points A in the corresponding region, respectively; At least one of the four triangular faces of the hollow tetrahedron is provided with a first through hole; in each of the regions, a horizontal rectangular plate of the three rectangular plates is provided with at least one second through hole; The shape of the first through hole and the shape of the second through hole are circular or polygonal; When the first through hole is circular, its diameter ranges from 1 / 6 to 1 / 4 of the longest side length of the rectangular plate; when the first through hole is polygonal, the diameter range of the circumscribed circle of the first through hole is 1 / 6 to 1 / 4 of the longest side length of the rectangular plate; when the second through hole is circular, its diameter ranges from 1 / 8 to 1 / 5 of the longest side length of the rectangular plate; when the second through hole is polygonal, the diameter range of the circumscribed circle of the second through hole is 1 / 8 to 1 / 5 of the longest side length of the rectangular plate.

2. The cell structure according to claim 1, characterized in that: The hollow tetrahedron is a hollow regular tetrahedron.

3. The cell structure according to claim 1, characterized in that: The center of circle or centroid of the first through hole coincides with the centroid of the triangular face in which it is located; the edge lines of the hollow tetrahedron in each of the areas divide the horizontal rectangular plate surface in the corresponding area into two triangles, and the center of circle or centroid of the second through hole coincides with the centroid of the triangle.

4. A plate-like lattice structure, characterized in that: The cell structure is formed by a periodic array of the cell structures described in any one of claims 1 to 3 along the left-right, front-back and up-down directions in three-dimensional space.

5. A method for constructing a cell structure as claimed in claim 1, characterized in that: The following steps are involved: Establish a spatial rectangular coordinate system; Taking the coordinate origin O of the spatial rectangular coordinate system as the center, rectangular plates with predetermined thickness and side length are constructed in the XOY plane, the XOZ plane and the YOZ plane respectively, and the three rectangular plates are orthogonally arranged to divide the three-dimensional space into eight virtual rectangular blocks; Select any one of the virtual cuboids, select three vertices on the XOY plane, the XOZ plane, and the YOZ plane that are diagonal to the coordinate origin O, and connect the coordinate origin O and the three vertices in pairs to form a hollow tetrahedron; The hollow tetrahedron is also formed in the other seven virtual cuboids to construct the cell structure.

6. The method for constructing a cell structure according to claim 5, characterized in that: After the cell structure is constructed, the following steps are also included: A first through hole is formed on at least one of the four triangular faces of the hollow tetrahedron; In each of the virtual cuboids, at least one second through hole is opened on the XOY plane.

7. A method for constructing a plate-like lattice structure, characterized in that: The method for constructing the cell structure according to claim 5 or 6 further comprises the following steps: The cell structure is used as a basic unit and is periodically arrayed along the X-axis, Y-axis and Z-axis directions of the spatial rectangular coordinate system to construct the plate-like lattice structure.

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