CN114439873A - Assembled periodic octahedral truss lattice structure - Google Patents
Assembled periodic octahedral truss lattice structure Download PDFInfo
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- CN114439873A CN114439873A CN202210037266.8A CN202210037266A CN114439873A CN 114439873 A CN114439873 A CN 114439873A CN 202210037266 A CN202210037266 A CN 202210037266A CN 114439873 A CN114439873 A CN 114439873A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
- F16S3/06—Assemblies of elongated members
- F16S3/08—Assemblies of elongated members forming frameworks, e.g. gratings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses an assembled periodic octahedral truss lattice structure, which is formed by connecting a plurality of assembled octahedral truss lattice units, wherein each assembled octahedral truss lattice unit consists of 2I connecting blocks and 2 II connecting blocks, 4 connecting blocks are in an octahedron shape after being mechanically connected through bolt groups, 6 sets of matched hole groups of the octahedral structure are formed by internally connecting and fixing short bolt groups, and different octahedral truss lattice units are connected through a long bolt group to form the periodic octahedral truss lattice structure. The invention decomposes the lattice unit cell into 4 parts, assembles the octahedral truss lattice unit cell and the periodic octahedral truss lattice structure in a mechanical connection mode, can avoid the limitation of processing equipment and process, and realizes the preparation of the periodic octahedral truss lattice structure with controllable size and rich configuration on the premise of low cost.
Description
Technical Field
The invention belongs to the field of advanced manufacturing, and particularly relates to a design of an assembled periodic octahedral truss lattice structure.
Background
The lattice structure design scheme of the porous truss is one of the most effective engineering weight reduction schemes which are generally accepted at present, and has various functional characteristics of controllable shape, shock absorption, heat dissipation, sound absorption, energy absorption, heat transfer and the like. The octahedral truss lattice structure has the advantages of low relative density, high specific stiffness, high strength, excellent mechanical property, excellent heat transfer performance and other excellent mechanical properties, and has great application value in the research of the fields of aviation industry, automobiles, heat exchangers and the like.
The octahedral lattice structure is a stretching leading type structure, can be used as a reliable substitute for a bending leading type structure such as a foam metal material, a honeycomb structure and the like, and has higher structural efficiency compared with the structure; in addition, the octahedral lattice structure has nearly isotropic mechanical performance, and the failure mode is changed from plastic failure of the support rod into elastic bending failure under low density, so that the specific strength of the structure is greatly reduced. Although the lattice structure of the truss has excellent performance, the complex manufacturing process limits the engineering application, and the traditional manufacturing process mainly comprises an investment casting method, a metal wire weaving method, a metal wire lapping assembly method, an additive manufacturing method and the like. Although the manufacturing process can prepare periodic truss lattice structures with various configurations and different materials, the methods are long in processing time and complicated in post-treatment, so that the energy consumption is high, the material utilization rate is low, and obvious defects such as air holes exist in the base material, so that the intrinsic mechanical property of the base material is reduced; in order to solve the limitation of the traditional preparation method, the invention provides an assembled periodic octahedral lattice truss structure, which realizes the regulation and control of the functions and characteristics of the structure by designing the configuration elements of single cells and improving the geometric dimension, and has the characteristics of strong designability, stable structural performance and the like. Specifically, the periodic octahedral lattice truss single cells are decomposed into I-type connecting blocks and II-type connecting blocks, each decomposed part can be prepared in a large batch through the traditional processes of injection molding, stamping and the like, mechanical assembly is carried out through a proper connecting piece to form a porous single cell, a periodic lattice truss structure is formed through reasonable combination among the single cells, and the preparation of the periodic octahedral lattice truss structure with controllable size and rich appearance is realized under the production condition of low cost.
Disclosure of Invention
Aiming at the defects or the improvement requirement of the prior art, the invention provides an assembled periodic octahedral truss lattice structure which is formed by connecting a type I connecting block and a type II connecting block through bolt groups. Specifically, 2I connecting blocks and 2 II connecting blocks can be assembled into a unit cell through the connection of short bolt groups; the long bolt group replaces one set of short bolt group in two assembled unit cells, so that the connection of adjacent unit cells can be realized, the extension is performed in sequence, the periodic connection of a plurality of unit cells is realized from point to line, from line to surface and from surface to body, and a space array is formed. The two types of connecting blocks can be prepared in large batch by adopting the traditional processing technology, and the technology is simple, thereby reducing the production cost and eliminating the limitation of processing size. In addition, the designed single-cell and periodic octahedral truss lattice structures of the octahedral truss lattice structures have excellent bearing performance and strong engineering applicability.
In order to achieve the purpose, the invention provides an assembled periodic octahedral truss lattice structure, which is formed by connecting a plurality of discrete assembled unit cells, wherein each discrete assembled octahedral truss unit cell consists of 2I-type connecting blocks and 2 II-type connecting blocks, and 4 connecting blocks are mechanically matched to form an octahedron; the short bolt groups are used for realizing the internal connection and fixation among the connecting blocks, so that the assembly of a single octahedral truss lattice unit is realized; the long bolt group replaces one set of short bolt group in two assembled unit cells to realize the connection of adjacent unit cells, the connection is sequentially extended, and the periodic connection of a plurality of octahedral truss lattice unit cells is realized from point to line, line to surface and surface to body to form a periodic truss lattice structure with controllable size and various configurations.
The I-type connecting block and the II-type connecting block are respectively composed of a main triangular ring block, an installing head and a bearing head, the structures of the I-type connecting block and the II-type connecting block are symmetrical about a Y axis, the structures of the installing head and the bearing head arranged on the two types of connecting blocks are kept consistent, an installing hole is formed in the installing head, a matching hole is formed in the bearing head, and the structures and the sizes of the two types of holes meet corresponding assembling requirements.
Class I as describedThe inner side of the connecting block main body is a rounded triangle, the triangle before rounding is regarded as a characteristic triangle, and the characteristic triangle is a regular triangle; the class I connecting block is provided with 2 round corners with the radius of R1 and 1 round corner with the radius of R2, and the round corners R1 and R2 are taken
2 first bearing heads and 1 first mounting head are arranged on the outer sides of the corresponding round corners, and the round corners have a certain thickness which is 1/30-1/10 of the side length of a characteristic triangle; and L is the overall maximum dimension of the unit cell.
The class II connecting block is similar to the class I connecting block, the inner side of the main body of the class II connecting block is a rounded triangle, the triangle before rounding is regarded as a characteristic triangle, and the characteristic triangle is a regular triangle; the II-type connecting block is provided with 1 round corner with the radius of R1 and 2 round corners with the radius of R2, and the sizes of the round corners R1 and R2 are taken
2 first mounting heads and 1 first bearing head are arranged on the outer sides of the corresponding round corners, and the round corners have a certain thickness which is 1/20-1/10 of the side length of a characteristic triangle; and L is the overall maximum dimension of the unit cell.
The long edge of the triangular inner profile of the I-type connecting block and the II-type connecting block has the size of
Short side dimension of
The width of the truss connecting rods in the two types of connecting blocks is W, the thickness of the truss connecting rods is S, the angle between the connecting rods in the single connecting block is 60 degrees, and the cross sections of the connecting rods are not limited to be rectangular and can be in other shapes; and L is the overall maximum dimension of the unit cell.
The bearing head and the mounting head are assembled one to one through mechanical matching of 2I-type connecting blocks and 2 II-type connecting blocks to form 6 sets of matching hole groups which are highly symmetrical about a mass center O and are uniformly distributed on an X, Y, Z shaft, and the 6 sets of matching hole groups after matching are fixed in an inline mode through short bolt groups to further realize the assembly of a single octahedral truss lattice unit; the long bolt group replaces the short bolt group to connect the matching hole group of the adjacent unit cells, so that the fixed connection of the adjacent unit cells is realized, six-hole external connection can be realized at most, and the flexibility is high.
The volume fraction of the octahedral truss lattice unit cell is controlled by the thickness and the width of the truss connecting rods of the two types of connecting blocks, the volume fraction is set to be 0.01-0.1, and a periodic octahedral truss lattice unit cell space structure with high void ratio is formed by combining and assembling 2I type connecting blocks and 2 II type connecting blocks.
Generally, compared with the prior art, the technical scheme conceived by the invention mainly has the following technical advantages:
1. the invention provides an assembled periodic octahedral truss lattice structure, which is characterized in that according to the design idea of structural element decomposition and recombination, structural elements of the octahedral truss lattice structure are decomposed firstly, 2-type heterogeneous connecting blocks are conceived, and mechanical connection is carried out through a bolt group, so that a complete truss lattice unit cell is assembled. Compared with the manufacturing method of the porous structure with the complex configuration by adopting the 3D printing technology, the method has the advantages that the configuration is relatively simple, the process limitation of the 3D printing technology is improved, the processing efficiency and the processing precision are improved, meanwhile, single parts can be processed in large batch by the traditional large-scale production processes such as injection molding, stamping and the like, and then the parts are assembled in a mechanical connection mode, so that the production process is simplified to a great extent, the production cost of the porous structure is reduced, and the preparation efficiency of the lattice structure of the truss is effectively improved.
2. Meanwhile, the assembled periodic octahedral truss lattice unit provided by the invention can be mechanically connected through the bolt group with the adaptive specification, so that the periodic connection between the octahedral truss lattice unit and the octahedral truss lattice unit is realized, and the periodic truss lattice structure with controllable size and various shapes is formed. The requirements of the octahedral truss lattice unit cell configuration on processing equipment are reduced, the process is simplified, the preparation is convenient, the application range is expanded, and the engineering application value is improved.
3. In addition, the assembled periodic octahedral truss lattice structure unit cell provided by the invention has the characteristics of small relative density, light weight, high specific stiffness, high bearing capacity and the like, and meets the requirements of structural bearing performance and light weight while saving materials. The truss lattice unit cell of the design can realize the external connection matching through the connection of the long bolt group at any connecting hole position, can realize six-hole external connection at most, and has high flexibility.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a first perspective three-dimensional representation of a class I connector block provided in accordance with an embodiment of the present invention.
FIG. 2 is a second perspective three-dimensional representation of a class I connector block provided in accordance with an embodiment of the present invention.
FIG. 3 is a first perspective three-dimensional view of a type II connector block provided in accordance with an embodiment of the present invention.
FIG. 4 is a second perspective three-dimensional view of a type II connector block provided in accordance with an embodiment of the present invention.
Fig. 5 is a three-dimensional schematic view of a type 2 connector block provided in an embodiment of the present invention before mechanical connection.
FIG. 6 is a schematic diagram of the structure of an octahedral truss lattice unit cell assembled in the preferred embodiment 1 of the present invention.
FIG. 7 is a graph of the thickness-dependent fundamental dimensions of an octahedral truss lattice unit cell assembled in accordance with preferred embodiment 1 of the present invention.
FIG. 8 is a graph of the side length dependent fundamental dimension of an octahedral truss lattice unit cell assembled in accordance with preferred embodiment 1 of the present invention.
FIG. 9 is a schematic diagram of the unit cell assembly of bigeminal octahedral truss lattice in the preferred embodiment 1 of the present invention.
Fig. 10 is a cross-sectional view a-a of the bi-octahedral truss lattice unit cell assembly of fig. 9 according to the preferred embodiment of the present invention.
Fig. 11 is a schematic view of a lattice structure of a space truss in the preferred embodiment 2 of the present invention.
In the figure: the structure comprises a type I connecting block 1, a type II connecting block 2, a short bolt group 3, a long bolt group 4, an octahedron 5, a single assembled truss lattice unit cell 6 and a lattice unit cell space structure 8.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
In order to more clearly illustrate the above objects, features and advantages of the present application, a detailed description of the present application is provided in this section in conjunction with the accompanying drawings. This application is capable of embodiments in addition to those described herein, and is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this application pertains and which fall within the limits of the appended claims. The protection scope of the present application shall be subject to the claims.
Example 1:
referring to fig. 1-10, the assembled periodic octahedral truss lattice structure provided by the invention is composed of 2I type connecting blocks 1, 2 II type connecting blocks 2 and bolt sets.
Furthermore, the inner sides of the class I connecting block 1 and the class II connecting block 2 are both closed circular-angle regular triangles which are symmetrical about the Y axis; the inner profile of the I-type connecting block 1 is provided with 2 round corners with the radius of R1 and 1 round corner with the radius of R2, 2 bearing heads and 1 mounting head are arranged outside the I-type connecting block, and the I-type connecting block has a certain thickness; the external 1 fillets with the radiuses of R1 and R2 are arranged on the II-type connecting blocks, 2 mounting heads and 1 bearing head are correspondingly arranged, the thickness of the fillets is certain, and the connecting blocks are taken
Further, in the present embodiment, the maximum size of the space of the unit cell as a whole is L, the large corner radius of the rounded triangle of the inner profile of the type i and type ii connection blocks is R1, the small corner radius is R2, and the corner sizes R1 and R2 are taken as
Two kinds of connectionThe width of the truss connecting rod in the block is W, and
thickness S, taking
And the angle between the truss connecting rods in the two types of connecting block parts is 60 degrees; in addition, the long side dimension of the inner profile of the rounded triangle of the I-type connecting block is taken
Corresponding short side dimension
Long edge size of inner profile of rounded triangle of II-type connecting block
Corresponding short side dimension
Furthermore, the mounting hole is a through hole on the mounting head, the same-size through hole or step hole is arranged on the bearing head, when the step hole is adopted, the aperture of the small hole of the step hole is consistent with the size of the through hole on the mounting head, and the aperture of the large hole is consistent with the size of the circumscribed circle of the nut, so that the bolt group with the same diameter can be mounted.
Furthermore, the inner surfaces of the mounting heads and the outer surfaces of the bearing heads in the I-type connecting blocks and the II-type connecting blocks are matching surfaces, 2I-type connecting blocks and 2 II-type connecting blocks are matched with one-to-one through 6 groups of mounting heads and bearing heads to form an octahedron 5, and the octahedron truss lattice unit cell 6 is obtained by mechanically connecting through a short bolt group 3 with a proper specification and finishing fastening.
Further, the type I connecting block 1 and the type II connecting block 2 can be prepared through a 3D printing, stamping or injection molding process.
Example 2:
referring to fig. 9-11, in order to improve the connection strength of the periodic octahedral truss lattice structure, the connection mode of the octahedral truss lattice unit can be adjusted.
Specifically, as illustrated in example 1, a plurality of octahedral truss lattice unit cells are assembled, and adjacent unit cells are interconnected by long bolt groups instead to form a bigeminal unit cell group.
Furthermore, the lattice unit cell space structure 8 of the truss is gradually formed by using the ideas of point-to-line, line-to-surface and surface-to-body, which is beneficial to improving the strength and stability of the porous structure.
Claims (7)
1. An assembled periodic octahedral truss lattice structure is characterized in that the octahedral truss lattice structure is formed by connecting a plurality of discrete assembling unit cells, each discrete assembling octahedral truss lattice unit cell (6) consists of 2I type connecting blocks (1) and 2 II type connecting blocks (2), and an octahedron (5) is formed by mechanically matching 4 connecting blocks; the short bolt group (3) realizes the internal connection and fixation among the connecting blocks, and further realizes the assembly of a single octahedral truss lattice unit cell (6); a long bolt group (4) replaces one set of short bolt group (3) in two assembled unit cells to realize the connection of adjacent unit cells, the extension is carried out in sequence, and the periodic connection of a plurality of octahedral truss lattice unit cells (6) is realized from point to line, line to surface and surface to body to form a periodic truss lattice structure with controllable size and various configurations.
2. The assembled periodic octahedral truss lattice structure of claim 1, wherein: the I-type connecting block (1) and the II-type connecting block (2) are respectively composed of a main body triangular ring block, a mounting head and a bearing head, the configurations of the mounting head and the bearing head are symmetrical about a Y axis, the configurations of the mounting head and the bearing head arranged on the two types of connecting blocks are kept consistent, mounting holes (a1, a2) are formed in the mounting head, matching holes (b1, b2) are formed in the bearing head, and the configurations and the sizes of the two types of holes meet corresponding assembling requirements.
3. An assembled cycle according to claim 1The octahedral truss lattice structure is characterized in that: the inner side of the main body structure of the I-type connecting block (1) is a rounded triangle, the triangle before rounding is regarded as a characteristic triangle, and the characteristic triangle is a regular triangle; the class I connecting block (1) is provided with 2 round corners with the radius of R1 and 1 round corner with the radius of R2, and the round corners R1 and R2 are taken
2 first bearing heads (102) and 1 first mounting head (101) are arranged on the outer side of the corresponding round corner, the thickness of the first bearing heads is 1/30-1/10 of the side length of a characteristic triangle; and L is the overall maximum dimension of the unit cell.
4. The assembled periodic octahedral truss lattice structure of claim 1, wherein: the type II connecting block (2) is similar to the type I connecting block (1), the inner side of the main body structure is a rounded triangle, the triangle before rounding is regarded as a characteristic triangle, and the characteristic triangle is a regular triangle; the II-type connecting block (2) is provided with 1 round corner with the radius of R1 and 2 round corners with the radius of R2, and the round corner sizes of R1 and R2 are taken
2 first mounting heads (201) and 1 first bearing head (202) are arranged on the outer sides of the corresponding round corners, and the round corners have certain thickness which is 1/20-1/10 of the side length of a characteristic triangle; and L is the overall maximum dimension of the unit cell.
5. The assembled periodic octahedral truss lattice structure of claim 1, wherein: the long side of the inner side outline of the triangle of the I-type connecting block (1) and the II-type connecting block (2) has the size of
Short side dimension of
The width of the truss connecting rods in the two types of connecting blocks is W, the thickness of the truss connecting rods is S, the angle between the connecting rods in the single connecting block is 60 degrees, and the cross sections of the connecting rods are not limited to be rectangular and can be in other shapes; and L is the overall maximum dimension of the unit cell.
6. The assembled periodic octahedral truss lattice structure of claim 1, wherein: the bearing head and the mounting head are assembled in a one-to-one mode through mechanical matching of 2I-type connecting blocks (1) and 2 II-type connecting blocks (2), 6 sets of matching hole groups (a-b) are formed, the height of the matching hole groups is highly symmetrical about a mass center O, axes are uniformly distributed on X, Y, Z shafts, the 6 sets of matching hole groups (a-b) after matching are fixed in an inner connection mode through short bolt groups (3), and then assembling of a single octahedral truss lattice unit cell (6) is achieved; the long bolt group (4) replaces the short bolt group (3) to connect the matched hole groups (a-b) of the adjacent unit cells, so that the fixed connection of the adjacent unit cells is realized, six-hole external connection can be realized at most, and high flexibility is realized.
7. The assembled periodic octahedral truss lattice structure of claim 1, wherein: the volume fraction of the octahedral truss lattice unit cell (6) is controlled by the thickness and the width of the truss connecting rods of the two types of connecting blocks, the volume fraction is set to be 0.01-0.1, and a periodic octahedral truss lattice unit cell space structure (8) with high void ratio is formed by the combined assembly of 2I type connecting blocks (1) and 2 II type connecting blocks (2).
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| WO1996009447A1 (en) * | 1994-09-23 | 1996-03-28 | Iverson Jeffrey B | Modular space frame |
| CN104088361A (en) * | 2014-06-24 | 2014-10-08 | 上海交通大学 | Super-elastic tension structure of octahedral unit truss |
| US20170043883A1 (en) * | 2015-05-07 | 2017-02-16 | Massachusetts Institute Of Technology | Digital Material Assembly By Passive Means And Modular Isotropic Lattice Extruder System (MILES) |
| CN112163291A (en) * | 2020-09-17 | 2021-01-01 | 华中科技大学 | Forming method of multi-material mechanical functional part in additive manufacturing and product |
| US20210078164A1 (en) * | 2019-09-13 | 2021-03-18 | The Board Of Trustees Of The Leland Stanford Junior University | Reconfigurable, Adaptable Robotic Structures |
| US20210146581A1 (en) * | 2019-11-19 | 2021-05-20 | Massachusetts Institute Of Technology | Method for discrete assembly of cuboctahedron lattice materials |
| CN113427836A (en) * | 2021-06-17 | 2021-09-24 | 中国科学院力学研究所 | Three-dimensional developable curved surface self-adaptive lattice structure and preparation method thereof |
| CN113719742A (en) * | 2021-08-31 | 2021-11-30 | 三峡大学 | Assembled high-bearing-capacity periodic porous structure |
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2022
- 2022-01-13 CN CN202210037266.8A patent/CN114439873B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996009447A1 (en) * | 1994-09-23 | 1996-03-28 | Iverson Jeffrey B | Modular space frame |
| CN104088361A (en) * | 2014-06-24 | 2014-10-08 | 上海交通大学 | Super-elastic tension structure of octahedral unit truss |
| US20170043883A1 (en) * | 2015-05-07 | 2017-02-16 | Massachusetts Institute Of Technology | Digital Material Assembly By Passive Means And Modular Isotropic Lattice Extruder System (MILES) |
| US20210078164A1 (en) * | 2019-09-13 | 2021-03-18 | The Board Of Trustees Of The Leland Stanford Junior University | Reconfigurable, Adaptable Robotic Structures |
| US20210146581A1 (en) * | 2019-11-19 | 2021-05-20 | Massachusetts Institute Of Technology | Method for discrete assembly of cuboctahedron lattice materials |
| CN112163291A (en) * | 2020-09-17 | 2021-01-01 | 华中科技大学 | Forming method of multi-material mechanical functional part in additive manufacturing and product |
| CN113427836A (en) * | 2021-06-17 | 2021-09-24 | 中国科学院力学研究所 | Three-dimensional developable curved surface self-adaptive lattice structure and preparation method thereof |
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