A powder particle-reinforced metamaterial and its manufacturing method

Abstract

The present invention discloses a powder particle-reinforced metamaterial and a manufacturing method thereof, relating to the technical field of vibration damping and energy dissipation. The powder particle-reinforced metamaterial includes a top plate and a bottom plate which are oppositely arranged, and a lattice body energy dissipation layer is connected between the top plate and the bottom plate. The lattice body energy dissipation layer is composed of a plurality of lattice unit cells arranged in an array and connected in sequence. The lattice unit cell is a regular polyhedron, and the lattice unit cell has a hollow chamber, and the chamber contains powder fillers. The present invention combines the lattice structure with powder particles, triggering multiple energy dissipation mechanisms of the powder particles at the microscopic level, greatly enhancing the absorption capacity of the overall structure for impact loads and vibration energy, reducing the vibration amplitude of the structure and the risk of impact damage in the case of being subjected to vibration or impact, and being able to better protect the safety of key components and personnel.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration damping and energy dissipation, and particularly relates to a powder particle-reinforced metamaterial and a manufacturing method thereof. Background Art

[0002] Vibration damping and energy dissipation materials are widely used in industrial fields such as aerospace, automobiles, and ships, as well as in daily life, to protect human safety and ensure that key mechanical components and precision equipment are protected from vibration and shock damage. Currently, although such materials have been widely used, the common problem is that they are relatively heavy in mass, and traditional vibration damping structures often have limited load-bearing capacity. Therefore, designing vibration damping and energy dissipation materials with a large load-bearing capacity is an urgent problem to be solved in the engineering field.

[0003] As an emerging functional material, mechanical metamaterials utilize their unique microstructural design to break through the limitations of the physical properties of traditional materials and can customize the mechanical response characteristics of materials to a large extent. Especially in the fields of energy absorption and vibration control, through the ingenious design and construction of non-uniform and periodic microstructures, precise control of energy dissipation can be achieved.

[0004] In recent years, with the development of additive manufacturing technology, the powder bed fusion forming process has gradually emerged as a prominent process. This process uses a high-resolution laser beam to selectively melt and solidify a metal powder bed layer according to a preset path, and layer by layer accumulation forms highly customized complex structural components. Compared with traditional manufacturing processes, the powder bed fusion forming technology has a series of advantages such as rapid prototyping without a mold, reducing enterprise development costs, high processing accuracy, high density, and the ability to form arbitrarily shaped complex parts required by designers.

[0005] In view of this, it is necessary to propose a powder particle-reinforced metamaterial and a manufacturing method thereof to solve the current problems of large weight and poor load-bearing capacity of vibration damping and energy dissipation materials. Summary of the Invention

[0006] The purpose of the present invention is to provide a powder particle-reinforced metamaterial and a manufacturing method thereof to solve the above technical problems existing in the prior art.

[0007] To achieve the above object, in one aspect of the present invention, the present invention provides a powder particle-reinforced metamaterial, including a top plate and a bottom plate arranged opposite to each other. A lattice body energy dissipation layer is connected between the top plate and the bottom plate. The lattice body energy dissipation layer is composed of a plurality of lattice unit cells arranged in an array and connected in sequence. The lattice unit cell is a regular polyhedron, and the lattice unit cell has a hollow chamber, and the chamber contains powder fillers.

[0008] Preferably, the powder fillers are metal powder particles.

[0009] Preferably, the lattice unit cell has a regular octahedron structure.

[0010] Preferably, the upper nodes of the lattice unit cell protrude upward with upper synapses connected to the top plate, the lower nodes protrude downward with lower synapses connected to the bottom plate, and each intermediate node extends outward to connect with middle synapses, and the middle synapses of adjacent lattice unit cells are connected.

[0011] Preferably, the top plate, the bottom plate and the lattice body energy dissipation layer are made of the same material.

[0012] Preferably, the top plate, the bottom plate and the lattice body energy dissipation layer are integrally formed.

[0013] Preferably, the top plate, the bottom plate and the lattice body energy dissipation layer are manufactured by 3D printing.

[0014] In another aspect of the present invention, the present invention provides a manufacturing method of a powder particle reinforced metamaterial for manufacturing the above-mentioned powder particle reinforced metamaterial, and the manufacturing method includes:

[0015] Using computer-aided three-dimensional modeling software to draw a three-dimensional model of the powder particle reinforced metamaterial, and importing the three-dimensional model into the printing system of the additive manufacturing device;

[0016] Taking metal powder particles as raw materials, and layer-by-layer printing the powder particle reinforced metamaterial through an additive manufacturing device; for each layer printed, the metal powder bed is re-laid, and the metal powder particles in the metal powder bed are retained in the chamber of the lattice unit cell as powder fillers.

[0017] Preferably, the powder particle reinforced metamaterial is layer-by-layer printed through an additive manufacturing device, and when each layer is printed, the metal powder bed is re-laid, and the metal powder particles in the metal powder bed are retained in the chamber inside the lattice unit cell as powder fillers.

[0018] In the manufacturing method of the present invention, the powder particle reinforced metamaterial is manufactured through an additive manufacturing device, and the additive manufacturing device includes a laser generating device, a laser scanning system, a powder conveying system, a workbench surface, a metal powder bed and a squeegee; the laser generating device is connected to the laser scanning system, the laser scanning system irradiates laser from above the metal powder bed, the workbench surface performs intermittent downward movement through a lifting mechanism to complete layer-by-layer printing, and the squeegee reciprocates on the upper surface of the metal powder bed to layer-by-layer lay metal powder particles.

[0019] The present invention discloses the following technical effects:

[0020] In view of the deficiencies of the prior art, the present invention provides a powder particle-reinforced metamaterial and a manufacturing method thereof, which combines a lattice structure with powder particles, triggers multiple energy dissipation mechanisms of the powder particles at the micro level, and greatly enhances the absorption capacity of the overall structure for impact loads and vibration energy. In the case of vibration or impact, the vibration amplitude of the structure is reduced and the risk of impact damage is decreased, which can better protect key components and the safety of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Isometric view of the powder particle-reinforced metamaterial according to an embodiment of the present invention;

[0023] Figure 2 Front view of the powder particle-reinforced metamaterial according to an embodiment of the present invention;

[0024] Figure 3 Schematic structural view of the structure after removing the top plate according to an embodiment of the present invention;

[0025] Figure 4 Schematic structural view of the lattice unit cell according to an embodiment of the present invention;

[0026] Figure 5 Front view of the lattice unit cell according to an embodiment of the present invention;

[0027] Figure 6 Cutaway view of the lattice unit cell according to an embodiment of the present invention;

[0028] Figure 7 Internal structural view of the lattice unit cell according to an embodiment of the present invention;

[0029] Figure 8 Is Figure 7 Partial enlarged view of the powder filler at A in

[0030] Figure 9 Cross-sectional view of the lattice unit cell according to an embodiment of the present invention;

[0031] Figure 10 Schematic structural view of the additive manufacturing device in the present invention.

[0032] Among them, 1. top plate; 2. bottom plate; 3. lattice body energy dissipation layer; 31. lattice unit cell; 311. unit cell body; 312. middle synapse; 313. upper synapse; 314. lower synapse; 315. chamber; 4. powder filler; 41. metal powder particles; 5. laser generating device; 6. laser scanning system; 7. laser; 8. powder conveying system; 9. scraper; 10. solidification zone; 11. forming wall surface; 12. powder bed; 13. unfused powder; 14. workbench surface; 15. lifting mechanism. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0035] Referring to Figures 1 to 3 as shown, the present invention provides a powder particle-reinforced metamaterial, including a top plate and a bottom plate arranged oppositely. A lattice body energy dissipation layer is arranged between the top plate and the bottom plate. The lattice body energy dissipation layer is composed of a plurality of lattice unit cells arranged in an array. The plurality of lattice unit cells are regularly arrayed and connected along a two-dimensional plane parallel to the top plate and the bottom plate. Specifically, in this embodiment, a plurality of lattice unit cells are arranged in a square array. The specific structure can be referred to Figure 3 as shown.

[0036] In the above embodiment, as Figures 4 to 9 shown, the lattice unit cell is a regular polyhedron structure. Specifically, the lattice unit cell includes a unit cell body with an octahedron structure. The inside of the unit cell body is hollow to form a chamber. Each node of the unit cell body extends outward to connect with a synapse. Among them, an upper synapse is provided at the upper node, a lower synapse is provided at the lower node, and middle synapses are provided at the middle 4 nodes. One end of the upper synapse away from the unit cell body is fixedly connected to the top plate, one end of the lower synapse away from the unit cell body is fixedly connected to the bottom plate, and the middle synapses in the middle position are used to connect with other adjacent lattice unit cells.

[0037] In some embodiments, the lattice unit cell can also be designed as a polyhedron of other shapes, such as a hexahedron or a dodecahedron. In the present invention, any shape that can help evenly disperse pressure and improve the energy absorption efficiency when subjected to an external force can be used as an alternative solution to this embodiment, and no restrictive limitation is made here.

[0038] In some embodiments, the upper synapse, middle synapse, and lower synapse in the above structure can be replaced with other connectors having stable connection performance. Each lattice unit cell is connected through the connectors to form a stable energy-consuming network layer structure, further enhancing the overall performance of the material.

[0039] For a further optimized solution, as Figure 6 and Figure 7 shown, the chamber of the lattice unit cell contains a powder filler. As Figure 8 shown, the powder filler is composed of metal powder particles, and these metal powder particles can undergo plastic deformation under external force, thereby absorbing and dissipating a large amount of energy.

[0040] In some embodiments, the metal powder particles can be aluminum alloy, cobalt-chromium alloy, copper alloy, titanium alloy, nickel alloy, etc., and no specific limitation is made here.

[0041] The present invention aims to propose a powder particle-reinforced metamaterial, which adopts advanced materials science and engineering technologies to achieve excellent energy-consuming performance through a special structure. Among them, the top plate and the bottom plate constitute the basic framework of the material, and the lattice body energy-consuming layer located between the two is the core of the structural material. The lattice body energy-consuming layer is composed of multiple lattice unit cells arranged in a two-dimensional regular pattern. Each lattice unit cell has a chamber inside, and the chamber is designed in an octahedron structure, which helps to evenly disperse pressure and improve the energy absorption efficiency when subjected to external force. The chamber is filled with metal powder particles, and these particles can undergo plastic deformation under external force, thereby absorbing and dissipating a large amount of energy. Each lattice unit cell in the lattice body energy-consuming layer is connected in a specific way. The four middle synapses in the middle fix adjacent lattice unit cells together to form a stable network structure, further enhancing the overall performance of the material. The upper synapse at the upper node firmly connects the lattice unit cell to the top plate; the lower synapse at the lower node connects the lattice unit cell to the bottom plate, ensuring that energy can be effectively transmitted from the top to the bottom when subjected to impact, and at the same time protecting the internal structure from damage.

[0042] Based on the above structure, the powder particle-reinforced metamaterial of the present invention can exhibit excellent energy-consuming ability under extreme conditions such as high-speed impact or explosion, which makes the material have potential application value in the fields of aerospace, military protection, vehicle collision safety, and building earthquake resistance.

[0043] The present invention also provides a manufacturing method for a powder particle-reinforced metamaterial for manufacturing the powder particle-reinforced metamaterial of the above embodiment. The manufacturing method includes the following steps:

[0044] S1. Use computer-aided 3D modeling software to draw a 3D model of the powder particle enhanced metamaterial, and import the 3D model into the printing system of the additive manufacturing device;

[0045] S2. Using metal powder particles as raw materials, the powder particle-enhanced metamaterial is printed layer by layer through an additive manufacturing device; after each layer is printed, the metal powder bed is re-laid, and the metal powder particles in the metal powder bed are retained in the cavity of the lattice unit cell as powder fillers.

[0046] Specifically, in step S1, a three-dimensional model of the powder particle enhanced metamaterial is drawn using commercial computer-aided three-dimensional modeling software (such as CAD), and the three-dimensional model does not include powder fillings in the cavity.

[0047] Specifically, in step S2, any additive manufacturing device and metal powder particles are selected to integrally print the top plate, the bottom plate, and the dot matrix energy-consuming layer, including:

[0048] S21, printing the bottom plate and the lower synapse layer by layer in sequence;

[0049] S22. According to the basic principle of additive manufacturing, the metal powder bed is re-laid for each layer printed. When printing the lattice unit cell and the synapse, since there is a hollow cavity inside the lattice unit cell, there are metal powder particles left in the cavity after each previous re-laying of the metal powder bed. The metal powder particles in the metal powder bed are retained in the cavity inside the lattice unit cell as powder fillers until the lattice unit cell combination printing is completed;

[0050] S23, printing the synapse and the top plate layer by layer in sequence, and thus the powder particle enhanced metamaterial is manufactured.

[0051] The present invention also provides an additive manufacturing device for powder particle enhanced metamaterials, which is used to execute the manufacturing method of the powder particle enhanced metamaterials. Figure 10 The structure shown includes a laser generating device, a laser scanning system, a powder conveying system, a work surface, a metal powder bed and a scraper, wherein the laser generating device is connected to the laser scanning system, and a plurality of optical elements are arranged in the laser scanning system for irradiating the metal powder bed with laser according to a set path. The area where the metal powder particles laid on the metal powder bed receive the laser forms a solidification zone, and the metal powder particles in the solidification zone form a molding wall. The unfused powder located in the molding wall is retained in the cavity of the lattice unit cell as a powder filler. The work surface performs intermittent downward movement through the lifting mechanism to complete the printing layer by layer, and the scraper reciprocates on the upper surface of the metal powder bed to lay the metal powder particles layer by layer.

[0052] Compared with the prior art, the present invention has at least the following beneficial effects:

[0053] A powder particle-reinforced metamaterial of the present invention fills metal powder into octahedral cavities, and proposes a brand-new unit cell with energy dissipation and vibration damping characteristics, and then forms a brand-new lattice energy dissipation layer. The combination of the lattice structure and metal powder particles realizes the integration of vibration damping and energy dissipation - high load - lightweight functions, which is a very promising design idea for a new generation of metamaterials.

[0054] At the beginning of the design of the present invention, the manufacturing process is considered. According to the characteristic that metal additive manufacturing technology requires laying a metal powder bed for printing, the metal powder particles retained in the unit cell cavity are used as fillers. Therefore, there is no need to perform other filling or remove the metal powder particles in the cavity, reducing the printing process and greatly shortening the preparation time of the present invention. At the same time, the integration of processing and manufacturing is realized.

[0055] The structure of the present invention is simple and easy to manufacture. It can be prepared and formed by metal additive manufacturing technology, and has the characteristics of strong designability and short preparation cycle. It has broad application prospects in the fields of aerospace, automotive industry, high-end equipment and national defense and military.

[0056] The details not described in the present invention are all conventional technical means well known to those skilled in the art.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, 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 should not be construed as a limitation of the present invention.

[0058] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A powder particle enhanced metamaterial, characterized in that: It comprises a top plate and a bottom plate which are arranged opposite to each other, wherein a lattice energy-consuming layer is connected between the top plate and the bottom plate, wherein the lattice energy-consuming layer is composed of a plurality of lattice cells which are arranged in an array and connected in sequence, wherein the plurality of lattice cells are connected in a regular array along a two-dimensional plane parallel to the top plate and the bottom plate; wherein the lattice cells are regular polyhedrons, wherein the upper nodes of the lattice cells protrude upwards and have upper synapses connected to the top plate, and the lower nodes protrude downwards and have lower synapses connected to the bottom plate, and each intermediate node extends toward the outer peripheral side and is connected to a middle synapse, and the middle synapses of two adjacent lattice cells are connected; wherein the lattice cells have a hollow chamber, wherein the chamber contains a powder filler, and the powder filler is metal powder particles.

2. The powder particle enhanced metamaterial according to claim 1, characterized in that: The lattice unit cell is a regular octahedral structure.

3. The powder particle enhanced metamaterial according to claim 1, characterized in that: The top plate, the bottom plate and the energy-consuming layer of the matrix body are made of the same material.

4. The powder particle enhanced metamaterial according to claim 3, characterized in that: The top plate, the bottom plate and the matrix energy-consuming layer are integrally formed.

5. The powder particle enhanced metamaterial according to claim 1, characterized in that: The top plate, the bottom plate and the lattice energy-consuming layer are manufactured by 3D printing.

6. A method for manufacturing a powder particle enhanced metamaterial, used for manufacturing the powder particle enhanced metamaterial according to any one of claims 1 to 5, characterized in that: include: Use computer-aided 3D modeling software to draw a 3D model of the powder particle-enhanced metamaterial, and import the 3D model into the printing system of the additive manufacturing device; Using metal powder particles as raw materials, powder particle-enhanced metamaterials are printed layer by layer through an additive manufacturing device; after each layer is printed, the metal powder bed is re-laid, and the metal powder particles in the metal powder bed are retained in the cavity of the lattice unit cell as powder fillers.

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