A hollow metal lattice viscoelastic structure realized using viscous fluid within a cavity and its preparation method.

Abstract

A hollow metal lattice viscoelastic structure utilizing viscous fluid within a cavity and its preparation method are disclosed, relating to the fields of 3D printing and metallized lattice materials. This invention solves the problem of easy aging and failure of existing viscoelastic materials. Each lattice unit (A) of this invention includes a hollow substrate, on which metallization is performed by chemical plating to form a metal lattice unit; multiple lattice units (A) are interconnected to obtain a hollow metal lattice structure. This hollow metal lattice structure is a piston-shaped or spherical shell-shaped cavity or a composite lattice structure with a spring. During compression, the viscosity is provided by the fluid within the cavity, and the viscoelastic properties are formed by the elasticity of the metal substrate. Step 1: Design the lattice structure; Step 2: The hollow metal lattice structure has a piston-shaped or spherical shell-shaped cavity and a spring structure. During compression, the viscosity is provided by the fluid within the cavity, and the viscoelastic properties are formed by the elasticity of the metal substrate. This invention is used in impact-resistant and vibration-damping environments.

Description

Technical Field

[0001] This invention relates to the field of 3D printing and metallized lattice materials, specifically to a hollow metal lattice viscoelastic structure realized by using viscous fluid in a cavity and its preparation method. Background Technology

[0002] Viscoelastic materials are widely used in machinery, chemical engineering, construction, transportation, information technology, and aerospace, effectively absorbing shocks and vibrations, thereby reducing energy transfer and noise generation. Viscoelasticity is a key characteristic of polymers, endowing them with superior properties. Polymer materials exhibit a combination of elasticity and viscosity. In actual deformation processes, viscosity and elasticity always coexist. When a polymer is subjected to stress, the stress depends simultaneously on both the deformation and the deformation rate, exhibiting both solid and liquid properties, with its mechanical behavior falling between that of an ideal elastic body and an ideal viscous body. Viscoelasticity allows plastics to simultaneously possess solid-like properties, such as elasticity, strength, and dimensional stability, and liquid-like properties, such as flow characteristics that vary with time, temperature, load size, and rate.

[0003] Compared with traditional metal structures, viscoelastic materials can reduce weight by up to 70% in lattice sandwich structures with the same performance; their buffering and energy absorption capabilities and efficiency are superior to honeycomb metal and foam metal; the specific strength and specific stiffness of metal lattice materials are far higher than those of traditional metal materials, greatly improving load-bearing efficiency; when applied to the solar energy structure of space satellites, lattice materials can effectively improve the energy efficiency per unit mass of solar energy, reaching 80-115W / kg.

[0004] Traditional viscoelastic materials are generally polymers, but during processing, storage and use, these materials can degrade or cross-link due to external stimuli, resulting in aging and eventually failure problems such as embrittlement and cracking. If these materials can be replaced with metal lattices with viscoelastic geometry, the problems of aging and deformation caused by long-term loading can be effectively avoided.

[0005] Currently, research on metallized lattice materials often focuses on improving strength and energy absorption rate, while lacking exploration of viscoelastic structures, thus failing to fully leverage the potential of advanced additive manufacturing technology in materials design.

[0006] In summary, existing viscoelastic materials are prone to aging and failure. Summary of the Invention

[0007] The purpose of this invention is to solve the problem of easy aging and failure of existing viscoelastic materials, and to provide a hollow metal lattice viscoelastic structure realized by viscous fluid in the cavity and its preparation method.

[0008] The technical solution of this invention is:

[0009] A hollow metal lattice viscoelastic structure utilizing viscous fluid within a cavity comprises multiple lattice units, each including a hollow substrate. The hollow substrate is metallized using chemical plating to form a metal lattice unit. Multiple lattice units are interconnected to obtain a hollow metal lattice structure. This hollow metal lattice structure is a piston-shaped or spherical cavity or a composite lattice structure with a spring. During compression, the viscosity is provided by the fluid within the cavity, and the viscoelastic properties are formed by the elasticity of the metal substrate.

[0010] This invention also provides a method for preparing a hollow metal lattice viscoelastic structure utilizing a viscous fluid within a cavity, comprising the following steps:

[0011] Step 1: Design the lattice structure;

[0012] Step 11: The software used is Siemens NX 2007 modeling software to draw the hollow base;

[0013] Steps one and two: The substrate is printed using photopolymer 3D printing technology;

[0014] Step 13: Metallization of the substrate is achieved using chemical plating; multiple lattice units are interconnected to form a lattice material;

[0015] Step 14: Etch the substrate to obtain a hollow metal lattice structure;

[0016] Step 2: The hollow metal lattice structure has a piston-shaped or spherical cavity and a spring structure. During compression, the fluid inside the cavity provides viscosity, and the elasticity of the metal matrix forms viscoelastic properties.

[0017] Furthermore, the photocuring method in steps one and two is: LCD screen photocuring molding technology; its resolution is 0.05mm, the exposure time is 2s, and the printing platform lifting speed is 3mm / s.

[0018] Furthermore, the chemical plating described in steps one and three combines traditional chemical plating with aluminum-induced chemical plating to obtain a pure metal coating.

[0019] Furthermore, step one and three, prior to electroless plating, also include a pretreatment of the substrate, which includes the following steps:

[0020] S1: Surface treatment:

[0021] Immerse the printing substrate in acetone solvent at room temperature for 13-18 minutes, then rinse with distilled water;

[0022] S2: Alkaline degreasing:

[0023] The substrate was placed in a degreasing solution and ultrasonically cleaned at room temperature for 10 to 20 minutes, and then rinsed with distilled water to obtain the alkaline degreasing substrate material.

[0024] The degreasing solution is composed of sodium hydroxide, sodium silicate, trisodium phosphate, sodium carbonate and distilled water. 1L of the degreasing solution contains 10g of sodium hydroxide, 3g of sodium silicate, 12g of trisodium phosphate and 8g of sodium carbonate.

[0025] S3: Sensitization:

[0026] The alkaline degreasing matrix material was placed in a 10 g / L stannous chloride solution and soaked for 6 min to 8 min at room temperature, and then rinsed with distilled water.

[0027] S4: Activation:

[0028] The sensitized substrate material was placed in a 0.7 g / L palladium aqueous solution and immersed for 6 min to 10 min at room temperature, and then washed with distilled water to obtain a substrate suitable for electroless plating.

[0029] Preferably, when the electroless plating in steps one and three is conventional electroless plating, conventional electroless plating includes the following steps:

[0030] Step 131: Complete the pretreatment of the substrate;

[0031] Steps 1-3-2: Prepare the chemical plating solution according to the following components: nickel sulfate 25g / L, sodium pyrophosphate 50g / L, sodium hypophosphite 25g / L, sodium hydroxide 2.3g / L, and distilled water;

[0032] Step 133: Perform chemical plating at 40-50℃.

[0033] Furthermore, after completing the traditional electroless plating, aluminum-induced electroless plating needs to be carried out, which includes the following steps:

[0034] Step 14: Connect the substrate, which has been coated with a metal layer after traditional chemical plating, to the aluminum foil to form a micro battery;

[0035] Step 15: Utilize the electrode potential of the aluminum foil to obtain the reaction kinetics, and perform chemical plating in the aluminum-induced chemical plating solution to replace the reducing agent containing P / B elements, thereby obtaining a pure metal coating. The types of pure metal coatings that can be obtained include one or more of nickel, iron, cobalt, chromium, tin, and zinc.

[0036] Preferably, the aluminum-induced chemical plating solution in step one five is composed of nickel sulfate, triethanolamine and distilled water, the reaction temperature is room temperature of 20°C, and the pH value is 10-11.

[0037] Preferably, in step one or four, a concentrated NaOH solution is used to etch the substrate.

[0038] Furthermore, it also includes fluid-structure interaction simulation and pure solid-state simulation of the prepared hollow metal lattice viscoelastic structure realized by viscous fluid in the cavity. The fluids used in the simulation process include gas and liquid.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1. This invention is a structure that utilizes viscous fluid within a cavity to achieve viscoelasticity in a hollow metal lattice. Based on a metallized hollow lattice, a viscoelastic cavity structure is designed. By combining the elasticity of the metal itself, a lattice structure with both elastic and viscous characteristics is obtained. This structure can be used for shock absorption and impact resistance, and can reduce the problem of easy aging and failure of polymer materials to a certain extent.

[0041] 2. This invention introduces a new viscoelastic structural unit, which, when combined with an elastic structure, can yield viscoelastic structures based on Maxwell, Kelvin, or composite models, further expanding the current lattice structure library.

[0042] 3. The present invention can obtain a structure that utilizes viscous fluid inside the cavity to achieve viscoelasticity of hollow metal lattice. Attached Figure Description

[0043] Figure 1 This is a schematic diagram illustrating the principle of utilizing the adhesiveness of the hollow metal lattice structure when the hollow metal lattice structure of the present invention is a spherical cavity.

[0044] Figure 2 This is a schematic diagram illustrating the principle of utilizing the adhesiveness of the hollow metal lattice structure when the hollow metal lattice structure of the present invention is piston-shaped.

[0045] Figure 3 This is a schematic diagram illustrating the principle of the adhesiveness of the hollow metal lattice structure when the hollow metal lattice structure of the present invention is a composite lattice structure with a spring; wherein, the lattice unit A achieves viscoelasticity by using an elastic spring and a glue pot, and the model is a composite structure of metal coating and resin matrix.

[0046] Figure 4 It is a unit cell of a spherical cavity lattice. This unit cell utilizes an elastic spherical shell and micropores to achieve viscoelasticity. This model is a metal-coated structure.

[0047] Figure 5 These are stress feedback data obtained from fluid-structure interaction simulation and pure solid-state structure simulation of the same structure under constant deformation rate. Detailed Implementation

[0048] Specific implementation method one: Combining Figures 1 to 4This embodiment describes a plurality of lattice units A, each of which includes a hollow substrate. The hollow substrate is metallized by chemical plating to form a metal lattice unit. The plurality of lattice units A are interconnected to form a hollow metal lattice structure. The hollow metal lattice structure is a piston-shaped or spherical cavity or a composite lattice structure with a spring. During compression, the viscosity is provided by the fluid inside the cavity, and the viscoelastic properties are formed by the elasticity of the metal substrate.

[0049] When the hollow metal lattice structure in this embodiment is piston-shaped, its structural form is as follows: Figure 2 As shown, it includes a hollow cylindrical groove A-1 and a piston rod A-2. The piston rod A-2 is inserted into the hollow cylindrical groove A-1, and a gap is left between the outer edge of the piston rod A-2 and the hollow cylindrical groove A-1. This gap allows the piston rod A-2 to discharge the medium (gas / liquid) when under pressure. During this process, the elastic element can absorb a portion of the instantaneous impact or vibration and store it as elastic energy, thereby reducing the peak intensity of the vibration and playing a damping role. The medium located in the hollow metal lattice structure, after being squeezed or stretched, flows in or out from the pores / gap and generates friction with the pores / gap, thus consuming energy and further dissipating the impact energy or the elastic energy stored in the spring. After being squeezed or stretched, the lattice structure recovers its original shape with the help of the elastic part in the structure.

[0050] In practical use, the spherical cavity of this embodiment has the following structural form: Figure 1 As shown, the cavity is preferably elliptical or spherical, and its interior is filled with a medium. When the cavity is elliptical, a discharge port is provided at each end along its major axis to allow the medium to be discharged promptly under pressure. When the cavity is spherical, a single discharge port is provided at the top. Multiple elliptical or spherical cavities are interconnected in four directions: up, down, left, and right.

[0051] When the hollow metal lattice structure in this embodiment is a composite lattice structure with a spring, its structural form is as follows: Figure 3 As shown, it includes a four-way tube A-3 and a spring A-4. The four-way tube A-3 is inserted into the adjacent four-way tube A-3 in all four directions (up, down, left, and right). The spring A-4 is fitted on the two adjacent insertion parts. The insertion parts can move away from each other without separating when the elastic potential energy of the spring A-4 is released. When the insertion parts are subjected to external force, they can be further inserted with the spring.

[0052] Specific Implementation Method Two: Combining Figure 1 This embodiment describes a method for preparing a hollow metal lattice viscoelastic structure as described in claim 1 using a viscous fluid within a cavity. The method includes the following steps:

[0053] Step 1: Design the lattice structure;

[0054] Step 11: The software used is Siemens NX 2007 modeling software to draw the hollow base;

[0055] Steps one and two: The substrate is printed using photopolymer 3D printing technology;

[0056] Step 13: Metallize the substrate using chemical plating; multiple lattice units A are interconnected to form a lattice material;

[0057] Step 14: Etch the substrate to obtain a hollow metal lattice structure;

[0058] Step 2: The hollow metal lattice structure has a piston-shaped or spherical cavity and a spring structure. During compression, the fluid inside the cavity provides viscosity, and the elasticity of the metal matrix forms viscoelastic properties.

[0059] This embodiment provides a method for preparing a hollow metal lattice structure, which, in its specific implementation:

[0060] In step one, the structural design was completed using Siemens NX 2007 modeling software and processed using slicing software. The designed structure is a lattice unit obtained by combining a sticky pot and a spring structure.

[0061] In steps one and two, the model after slicing in step one is printed using a photopolymer 3D printer with a resolution (layer thickness) of 0.05mm, an exposure time of 2s, and a printing platform lifting speed of 3mm / s to obtain a resin matrix.

[0062] The size of a single lattice unit in steps one and three is 4*4*4mm. 3 Multiple lattice units constitute a lattice material;

[0063] Finally, the resin matrix is ​​etched to obtain a metal lattice structure with viscoelastic cavities.

[0064] Furthermore, in practice, as an alternative, the design mechanism of the lattice unit of this invention no longer employs the sticky pot + spring structure, but instead utilizes a porous spherical shell to achieve a composite of viscous and elastic structures. Alternatively, etching of the resin matrix can be omitted during the design phase, and no etching can be performed after chemical plating, directly obtaining a metal plating-resin composite lattice structure.

[0065] In addition, the coating is no longer made of metallic nickel, but of one or more of iron, cobalt, chromium, tin and zinc.

[0066] Specific implementation method three: Combining Figures 1 to 4This embodiment describes the photocuring method used in steps one and two as follows: LCD screen photocuring molding technology; its resolution is 0.05mm, the exposure time is 2s, and the printing platform lifting speed is 3mm / s.

[0067] This configuration, with its appropriate photocuring parameters, helps ensure print quality, guaranteeing structural integrity, and ensuring uniform and stable wall thickness and joints. Other components and connections are the same as in implementation method one or two.

[0068] Specific implementation method four: Combination Figures 1 to 4 This embodiment describes a combination of traditional chemical plating and aluminum-induced chemical plating to obtain a pure metal coating.

[0069] With this setup, compared to traditional electroless plating, the pure metal coating obtained through aluminum-induced plating exhibits reduced brittleness and superior toughness due to the absence of interference from the non-metallic element phosphorus. Other components and connections remain the same as in any of the specific embodiments one through three.

[0070] Specific Implementation Method Five: Combining Figures 1 to 4 This embodiment describes a pretreatment of the substrate before electroless plating, which includes the following steps:

[0071] S1: Surface treatment:

[0072] Immerse the printing substrate in acetone solvent at room temperature for 13-18 minutes, then rinse with distilled water;

[0073] S2: Alkaline degreasing:

[0074] The substrate was placed in a degreasing solution and ultrasonically cleaned at room temperature for 10 to 20 minutes, and then rinsed with distilled water to obtain the alkaline degreasing substrate material.

[0075] The degreasing solution is composed of sodium hydroxide, sodium silicate, trisodium phosphate, sodium carbonate and distilled water. 1L of the degreasing solution contains 10g of sodium hydroxide, 3g of sodium silicate, 12g of trisodium phosphate and 8g of sodium carbonate.

[0076] S3: Sensitization:

[0077] The alkaline degreasing matrix material was placed in a 10 g / L stannous chloride solution and soaked for 6 min to 8 min at room temperature, and then rinsed with distilled water.

[0078] S4: Activation:

[0079] The sensitized substrate material was placed in a 0.7 g / L palladium aqueous solution and immersed for 6 min to 10 min at room temperature, and then washed with distilled water to obtain a substrate suitable for electroless plating.

[0080] With this setup, after immersion, palladium atoms adhere to the resin matrix, and subsequent electroless plating will proceed based on these palladium atoms. Other components and connections are the same as in any of the specific embodiments one through four.

[0081] Specific Implementation Method Six: Combination Figures 1 to 4 This embodiment describes a conventional electroless plating process used in steps one and three. Conventional electroless plating includes the following steps:

[0082] Step 131: Complete the pretreatment of the substrate;

[0083] Step 1, 3, 2: Prepare the chemical plating solution according to the following components: nickel sulfate 25g / L, sodium pyrophosphate 50g / L, sodium hypophosphite 25g / L, sodium hydroxide 2.3g / L, and distilled water (distilled water is present as a solute);

[0084] Step 133: Perform chemical plating at 40-50℃ for 2 hours.

[0085] Specific implementation method seven: Combining Figures 1 to 4 This embodiment describes a method that, after completing conventional electroless plating, requires further aluminum-induced electroless plating, which includes the following steps:

[0086] Step 14: Connect the substrate, which has been coated with a metal layer after traditional chemical plating, to the aluminum foil to form a micro battery;

[0087] Step 15: Utilize the electrode potential of the aluminum foil to obtain the reaction kinetics, and perform chemical plating in the aluminum-induced chemical plating solution to replace the reducing agent containing P / B elements, thereby obtaining a pure metal coating. The types of pure metal coatings that can be obtained include one or more of nickel, iron, cobalt, chromium, tin, and zinc.

[0088] With this setup, compared to traditional electroless plating, the pure metal coating obtained through aluminum-induced plating exhibits reduced brittleness and superior toughness due to the absence of interference from the non-metallic element phosphorus. Other components and connections remain the same as in any of the specific embodiments one through six.

[0089] Specific implementation method eight: Combination Figures 1 to 4 This embodiment describes an aluminum-induced chemical plating solution in step one of these steps, which consists of nickel sulfate, triethanolamine, and distilled water. The reaction temperature is room temperature (20°C), and the pH value is 10-11. This configuration ensures the smooth progress of the chemical plating process. Other components and connections are the same as in any of the specific embodiments one through seven.

[0090] Specific Implementation Method Nine: Combining Figures 1 to 4 In this embodiment, step one to four involves etching the substrate with a concentrated NaOH solution. This etching process completely corrodes the resin substrate, resulting in a hollow metal microlattice structure. Other components and connections are the same as in any of embodiments one through seven.

[0091] Specific Implementation Method Ten: Combining Figure 5 This embodiment further includes fluid-structure interaction simulation and pure solid-state simulation of the prepared hollow metal lattice viscoelastic structure realized by viscous fluid within the cavity. The fluids used in the simulation include both gas and liquid. This setup allows for direct comparison of the effects of the lattice structure under different parameters through simulation, reducing the number of experiments. Other components and connections are the same as in any of the specific embodiments one through seven.

[0092] Combination Figures 1 to 5 The beneficial effects of this invention can be verified through the following embodiments:

[0093] Example 1: A viscoelastic lattice structure of metal coating-resin composite, completed according to the following steps:

[0094] I. The structural design was completed using Siemens NX 2007 modeling software, resulting in the following: Figure 2 The structure shown was exported in .stl file format to the slicing software Cube Workshop, converted to .pm3 file format, and imported into the Anycubic Photon M3 photopolymer 3D printer.

[0095] 2. Print according to the following parameters: resolution (layer thickness) is 0.05mm, normal exposure time is 2s, light-off time is 0.5s, bottom exposure time is 23s, bottom layer number is 4, printing platform lifting speed is 3mm / s, lifting height is 6mm, and retraction speed is 4mm / s.

[0096] 3. After successful printing, remove the model from the printing platform, clean it with alcohol, and cure it with ultraviolet light before removing the resin support to obtain the resin matrix.

[0097] IV. Perform chemical plating on the substrate according to the following steps:

[0098] a) Surface treatment: Immerse the printed structure in acetone solvent at room temperature for about 15 minutes, and then rinse with distilled water;

[0099] b) Alkaline degreasing: The substrate is placed in the degreasing solution and ultrasonically cleaned for 10-20 minutes at room temperature, followed by rinsing with distilled water to obtain the alkaline degreasing substrate material; the degreasing solution is composed of sodium hydroxide, sodium silicate, trisodium phosphate, sodium carbonate and distilled water, and 1L of degreasing solution contains 10g sodium hydroxide, 3g sodium silicate, 12g trisodium phosphate and 8g sodium carbonate respectively;

[0100] c) Sensitization: The alkaline degreasing matrix material is placed in a 10 g / L stannous chloride solution and soaked for 6 min to 8 min at room temperature, and then rinsed with distilled water;

[0101] d) Activation: The sensitized substrate material is placed in a 0.7 g / L palladium aqueous solution and immersed for 6 min to 10 min at room temperature, and then washed with distilled water to obtain a substrate suitable for electroless plating;

[0102] e) Plating: Prepare the chemical plating solution according to the following composition: nickel sulfate (25g / L), sodium pyrophosphate (50g / L), sodium hypophosphite (25g / L), sodium hydroxide (2.3g / L), and distilled water. Perform chemical plating at 40-50℃.

[0103] f) Connect the coated substrate to the aluminum foil using wires to form a circuit, then place it in an aluminum-induced electroless plating solution to further obtain a pure nickel coating on the electroless nickel plating layer.

[0104] g) After cleaning, a viscoelastic lattice structure is obtained.

[0105] Example 2: A hollow metal viscoelastic lattice structure, completed according to the following steps:

[0106] I. The structural design was completed using Siemens NX 2007 modeling software, resulting in the following: Figure 3 The structure shown was exported in .stl file format to the slicing software Cube Workshop, converted to .pm3 file format, and imported into the Anycubic Photon M3 photopolymer 3D printer.

[0107] 2. Print according to the following parameters: resolution (layer thickness) is 0.05mm, normal exposure time is 2s, light-off time is 0.5s, bottom exposure time is 23s, bottom layer number is 4, printing platform lifting speed is 3mm / s, lifting height is 6mm, and retraction speed is 4mm / s.

[0108] 3. After successful printing, remove the model from the printing platform, clean it with alcohol, and cure it with ultraviolet light before removing the resin support to obtain the resin matrix.

[0109] IV. Perform chemical plating on the substrate according to the following steps:

[0110] a) Surface treatment: Immerse the printed structure in acetone solvent at room temperature for about 15 minutes, and then rinse with distilled water;

[0111] b) Alkaline degreasing: The substrate is placed in the degreasing solution and ultrasonically cleaned for 10-20 minutes at room temperature, followed by rinsing with distilled water to obtain the alkaline degreasing substrate material; the degreasing solution is composed of sodium hydroxide, sodium silicate, trisodium phosphate, sodium carbonate and distilled water, and 1L of degreasing solution contains 10g sodium hydroxide, 3g sodium silicate, 12g trisodium phosphate and 8g sodium carbonate respectively;

[0112] c) Sensitization: The alkaline degreasing matrix material is placed in a 10 g / L stannous chloride solution and soaked for 6 min to 8 min at room temperature, and then rinsed with distilled water;

[0113] d) Activation: The sensitized substrate material is placed in a 0.7 g / L palladium aqueous solution and immersed for 6 min to 10 min at room temperature, and then washed with distilled water to obtain a substrate suitable for electroless plating;

[0114] e) Plating: Prepare the chemical plating solution according to the following composition: nickel sulfate (25g / L), sodium pyrophosphate (50g / L), sodium hypophosphite (25g / L), sodium hydroxide (2.3g / L), and distilled water. Perform chemical plating at 40-50℃.

[0115] f) Connect the coated substrate to the aluminum foil using wires to form a circuit, then place it in an aluminum-induced electroless plating solution to further obtain a pure nickel coating on the electroless nickel plating layer.

[0116] g) The substrate is etched using an alkaline solution to obtain a hollow metal lattice with viscoelastic properties.

[0117] V. Fluid-structure interaction simulation and pure solid-state structure simulation were performed on the structure, and the results are as follows: Figure 4 As shown, the results indicate that the feedback stress of the lattice structure increases under the same strain conditions after the introduction of air fluid. This suggests that, compared to the vacuum state, the air fluid produces a viscous effect, meaning that the resistance generated by the viscous fluid is greater under faster compression. This further demonstrates that the structure's ability to resist external deformation and its energy consumption capacity are improved after the introduction of air fluid.

[0118] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hollow metal lattice viscoelastic structure implemented with viscous fluid in a cavity, characterized in that: It comprises a plurality of dot array units (A), Each dot array unit (A) comprises a hollow base body, which is metalized by electroless plating to form a metal dot array unit; A plurality of dot array units (A) are connected to obtain a hollow metal dot array structure, which is a piston-shaped or spherical shell-shaped cavity or a composite dot array structure with a spring, which provides viscosity by the fluid in the cavity during compression, and forms viscoelastic properties by the elasticity of the metal base body; Wherein, when the hollow metal dot array structure is piston-shaped, it comprises a hollow cylindrical groove body (A-1) and a piston rod body (A-2), the piston rod body (A-2) is inserted into the hollow cylindrical groove body (A-1), and a gap is left between the outer edge of the piston rod body (A-2) and the hollow cylindrical groove body (A-1), the gap is used for the piston rod body (A-2) to discharge the medium from the gap when it is subjected to pressure; Or when the hollow metal dot array structure is a spherical shell-shaped cavity, the cavity shape is elliptical or spherical, the cavity is filled with medium, when it is elliptical, one discharge hole is arranged at each end of the major axis direction, for timely discharge of the medium after being subjected to pressure; when it is spherical, one discharge hole is arranged at the upper part, and a plurality of elliptical or spherical cavities are connected to each other in the up, down, left and right directions; Or when the hollow metal dot array structure is a composite dot array structure with a spring, it comprises a four-way pipe body (A-3) and a spring (A-4), the four-way pipe body (A-3) is inserted into the adjacent four-way pipe body (A-3) in the up, down, left and right directions, and the spring (A-4) is sleeved on the adjacent two insertion parts, the insertion parts can move away from each other without separating under the elastic potential energy release of the spring (A-4), and the insertion parts can further insert under the action of the spring under the action of external force.

2. A method of making a hollow metal lattice viscoelastic structure using a viscous fluid in a cavity as claimed in claim 1, characterized in that: It comprises the following steps: Step one: design the dot array structure; Step one: use Siemens NX 2007 modeling software to draw the hollow base body; Step two: complete the base body printing by light curing 3D printing technology; Step three: metalize the base body by electroless plating; a plurality of dot array units (A) are connected to form a dot array material; Step four: etch the base body to obtain a hollow metal dot array structure; Step two: the hollow metal dot array structure has a piston-shaped or spherical shell-shaped cavity and a spring structure, which provides viscosity by the fluid in the cavity during compression, and forms viscoelastic properties by the elasticity of the metal base body.

3. The method of claim 2, wherein: The light curing method in step two is LCD screen light curing molding technology, with a resolution of 0.05mm, an exposure time of 2s, and a printing platform lifting speed of 3mm / s.

4. The method of claim 3, wherein: The electroless plating in step three is a combination of traditional electroless plating and aluminum-induced electroless plating to obtain a pure metal plating layer.

5. The method of claim 4, wherein: Before electroless plating in step three, the base body is pretreated, which comprises the following steps: S1: surface treatment: Put the printed base body in acetone solvent and soak at room temperature for 13-18min, then wash with distilled water; S2: alkali degreasing: The base body is placed in the oil removal liquid, and is ultrasonically cleaned at room temperature for 10-20 min, and then is cleaned with distilled water to obtain the base body material after alkaline oil removal; The oil removal liquid is composed of sodium hydroxide, sodium silicate, trisodium phosphate, sodium carbonate and distilled water, and 1 L of the oil removal liquid contains 10 g of sodium hydroxide, 3 g of sodium silicate, 12 g of trisodium phosphate and 8 g of sodium carbonate, respectively. S3: Sensitization: The base body material after alkaline oil removal is placed in a 10 g / L stannous chloride solution, and is soaked at room temperature for 6-8 min, and then is cleaned with distilled water. S4: Activation: The base body material after sensitization is placed in a 0.7 g / L aqueous palladium solution, and is soaked at room temperature for 6-10 min, and then is cleaned with distilled water to obtain a base body suitable for chemical plating.

6. The method of claim 5, wherein: When the chemical plating in step one three is a traditional chemical plating, the traditional chemical plating includes the following steps: Step one three one: completing the pretreatment of the base body; Step one three two: configuring a chemical plating liquid according to the following components: 25 g / L of nickel sulfate, 50 g / L of sodium pyrophosphate, 25 g / L of sodium hypophosphite, 2.3 g / L of sodium hydroxide, and distilled water; Step one three three: performing chemical plating at 40-50 DEG C.

7. The method of claim 6, wherein: After the completion of the traditional chemical plating, aluminum-induced chemical plating needs to be further implemented, and the aluminum-induced chemical plating includes the following steps: Step one four: connecting the base body coated with a metal plating layer after the traditional chemical plating operation with an aluminum foil to form a micro-battery; Step one five: obtaining a reaction power by using the electrode potential of the aluminum foil, performing chemical plating in an aluminum-induced chemical plating plating liquid, thereby replacing a reducing agent containing P / B elements, and obtaining a pure metal plating layer, and the pure metal plating layer type that can be obtained includes one or more of nickel, iron, cobalt, chromium, tin and zinc.

8. The method of claim 7, wherein: The aluminum-induced chemical plating plating liquid in step one five is composed of nickel sulfate, triethanolamine and distilled water, the reaction temperature is room temperature of 20 DEG C, and the pH value is 10-11.

9. The method of claim 8, wherein: In step one four, a concentrated NaOH solution is used to etch the base body.

10. The method of claim 2 or 9, wherein: It also includes fluid-structure coupling simulation and pure solid-state simulation on the prepared hollow metal lattice viscoelastic structure realized by using the viscous fluid in the cavity, and the fluid used in the simulation process includes gas and liquid.

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