A laser welding method for three-dimensional metamaterials

Abstract

The present invention discloses a laser welding method for three-dimensional metamaterials, which belongs to the technical field of laser welding of three-dimensional metamaterials. An auxiliary welding device is used, which can realize the clamping, movement and installation of various structural units constituting the three-dimensional metamaterial. Various structural units are alternately installed on the mounting plate of the auxiliary welding device to form a first-layer structural unit. The various structural units are assembled and welded on the basis of the first-layer structural unit by the auxiliary welding device to form a second-layer structural unit, a third-layer structural unit and a fourth-layer structural unit, and finally the assembled and welded three-dimensional metamaterial is obtained. The laser welding method for three-dimensional metamaterials proposed by the present invention can assist operators in improving production efficiency by using an auxiliary welding device to produce and manufacture three-dimensional metamaterials. Compared with the traditional method of assembling multiple structural units, the three-dimensional metamaterial structure obtained by welding is more stable and has better mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of three-dimensional metamaterial laser welding, and in particular to a three-dimensional metamaterial laser welding method. Background Art

[0002] 3D mechanical metamaterials are a class of artificial materials with exotic mechanical properties not found in nature. Their unique properties mainly come from the topological structure of specially designed representative units. 3D mechanical metamaterials are usually constructed through periodic representative units, which can obtain various unusual mechanical properties, such as negative stiffness and negative compressibility. Due to their extraordinary mechanical properties, 3D mechanical metamaterials have been studied for a wide range of applications, such as energy absorption boxes, shock absorbers, airless tires, and even bone implants.

[0003] Three-dimensional mechanical metamaterials have complex three-dimensional structures. Currently, additive manufacturing is often used to manufacture three-dimensional structures. However, additive manufacturing has the problems of high cost, low production efficiency and precision. Technicians have also developed a method of preparing three-dimensional metamaterials by assembly. However, the connection of the three-dimensional mechanical metamaterials assembled by assembly is not strong enough, and the assembly points are easily loosened due to various factors such as friction and wear, resulting in the assembled three-dimensional mechanical metamaterials being unstable and having impaired performance.

[0004] In the prior art, representative unit structures are also connected by brazing or gluing to manufacture three-dimensional mechanical metamaterials. However, this method requires adding alloy powder or glue to the interlocking positions of the representative unit structures, which will cause uneven assembly of the representative unit structures and lead to weakening of the overall three-dimensional metamaterial mechanical properties. In addition, the manufacturing method using brazing or gluing is relatively complicated, and requires high assembly skills from the operator, and the quality of the finished product cannot be effectively guaranteed.

[0005] Therefore, how to achieve stable and efficient manufacturing of three-dimensional mechanical metamaterials and ensure that they have excellent mechanical properties and stable structure after manufacturing is a technical problem that urgently needs to be solved in the current field of three-dimensional mechanical metamaterial manufacturing. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a laser welding method for three-dimensional metamaterials. According to the assembly method of various structural units, the auxiliary welding device proposed in the present invention is used for laser welding, which can assist operators in producing and manufacturing three-dimensional metamaterials to improve production efficiency and reduce production costs. At the same time, compared with the traditional method of assembling various structural units with each other, the three-dimensional mechanical metamaterial structure obtained by welding is more stable and has excellent mechanical properties.

[0007] The technical solution of the present invention is as follows:

[0008] In a first aspect of the present invention, a laser welding method for a three-dimensional metamaterial is provided, comprising:

[0009] Step 1, building an auxiliary welding device, the auxiliary welding device includes a tilting base and a clamping mechanism, the tilting base is provided with a mounting plate and an X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism, the mounting plate is connected to the X-axis moving mechanism, and the clamping mechanism can move along the Y-axis direction and the Z-axis direction under the drive of the Y-axis moving mechanism and the Z-axis moving mechanism;

[0010] Step 2, alternately mounting a plurality of structural units constituting the bottom layer of the three-dimensional metamaterial on a mounting plate to form a first layer of structural units;

[0011] Step 3: Clamp the structural unit with a clamping mechanism, adjust the position of the clamping mechanism by adjusting the Y-axis moving mechanism and the Z-axis moving mechanism, and adjust the position of the mounting plate by adjusting the X-axis moving mechanism, so that the structural unit is installed from one side of the first-layer structural unit, and after installation, a laser welding device is used to perform laser welding on one side of the connection between two adjacent layers of structural units perpendicular to the horizontal bottom surface, and laser welding is performed on one side of the connection between the upper and lower adjacent layers of structural units installed each time a structural unit is installed;

[0012] Step 4: After the second-layer structural unit and the bottom-layer structural unit are installed and welded one by one, the mounting plate is removed, rotated 180°, and then installed on the inclined base, and a laser welding device is used to perform laser welding on the other side of the connection between the upper and lower adjacent structural units perpendicular to the bottom surface to form the second-layer structural unit;

[0013] Step 5: After the second layer of structural units is formed, remove the mounting plate and rotate it 90°, and repeat steps 3 and 4 to install the welded structural units to form the third layer of structural units;

[0014] Step 6. After the third layer of structural units is formed, remove the mounting plate and rotate it 90 degrees, and repeat steps 3 and 4 to install the welded structural units to form the fourth layer of structural units.

[0015] In some embodiments of the present invention, the various structural units are alternately provided with a plurality of convex structures and concave structures, the plurality of convex structures and concave structures are provided with slots, and the various structural units are connected to each other through the slots.

[0016] In some embodiments of the present invention, the concave structures and the convex structures of two horizontally adjacent metamaterial structure units of the first layer structure unit are staggered.

[0017] In some embodiments of the present invention, the bottom of the tilting base is horizontally arranged, the top of the tilting base is a planar structure with a set tilting angle, and the X-axis moving mechanism, the Y-axis moving mechanism and the Z-axis moving mechanism are arranged on the top of the tilting base.

[0018] In some embodiments of the present invention, the tilt angle is calculated from the gap width and gap height between adjacent structural units.

[0019] In some embodiments of the present invention, the X-axis moving mechanism includes an X-axis fine-tuning moving platform, on which a mounting plate is arranged; an X-axis fine-tuning locking knob is provided at one end of the X-axis fine-tuning moving platform away from the mounting plate, and an X-axis fine-tuning locking knob is provided at one end of the X-axis fine-tuning locking knob away from the mounting plate, and an X-axis micrometer head is provided at the other end of the X-axis micrometer head, and the movement of the X-axis fine-tuning platform is controlled by rotating the X-axis micrometer head.

[0020] In some embodiments of the present invention, the Y-axis moving mechanism includes a Y-axis coarse adjustment moving platform, a Y-axis coarse adjustment locking knob and a Y-axis coarse adjustment moving knob are provided on the Y-axis coarse adjustment moving platform, a Y-axis fine adjustment moving platform is provided on the side of the Y-axis coarse adjustment moving platform close to the mounting plate, a clamping mechanism is provided on the side of the Y-axis fine adjustment moving platform close to the mounting plate, a Y-axis fine adjustment locking knob and a Y-axis micrometer head are provided on the Y-axis fine adjustment moving platform, and the movement of the Y-axis fine adjustment platform is controlled by rotating the Y-axis micrometer head.

[0021] In some embodiments of the present invention, the Z-axis moving mechanism includes a Z-axis coarse adjustment moving platform, a Z-axis coarse adjustment locking knob and a Z-axis coarse adjustment moving knob are provided on the Z-axis coarse adjustment moving platform, a Z-axis fine adjustment moving platform is provided on the side of the Z-axis coarse adjustment moving platform close to the mounting plate, the Z-axis fine adjustment moving platform is connected to the Y-axis moving mechanism on the side close to the mounting plate, a Z-axis fine adjustment locking knob and a Z-axis micrometer head are provided on the Z-axis fine adjustment moving platform, and the movement of the Z-axis fine adjustment platform is controlled by rotating the Z-axis micrometer head.

[0022] In some embodiments of the present invention, the clamping mechanism is configured as a U-shaped structure with an opening downward, and a fixed top screw is provided at one end of the U-shaped structure away from the Y-axis moving mechanism.

[0023] In some embodiments of the present invention, the Y-axis moving mechanism and the Z-axis moving mechanism are moved by a rack and pinion mechanism.

[0024] One or more technical solutions of the present invention have the following beneficial effects:

[0025] The laser welding method of a three-dimensional metamaterial proposed in the present invention adopts an auxiliary welding device. Based on the assembly method of multiple structural units, the auxiliary welding device is used to produce and manufacture the three-dimensional metamaterial, which can assist operators to improve production efficiency and reduce production costs. At the same time, compared with the traditional method of assembling multiple structural units, the three-dimensional mechanical metamaterial structure obtained by welding is more stable and has better mechanical properties.

[0026] The tilting base provided by the present invention has a set tilting angle, and can cooperate with the laser welding device to extend into the gap between horizontally adjacent structural units for laser welding without welding interference. At the same time, the assembly and adjustment of the structural units are performed through the X-axis moving mechanism, the Y-axis moving mechanism, the Z-axis moving mechanism and the clamping mechanism, which can further help the operating personnel to perform positioning, installation and welding, and improve the installation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of an auxiliary welding device for three-dimensional metamaterials provided in Example 1 of the present invention;

[0028] Figure 2 A schematic side view of the overall structure of an auxiliary welding device for three-dimensional metamaterials provided in Example 1 of the present invention;

[0029] Figure 3 A schematic diagram of a first unit of a three-dimensional metamaterial provided in Example 1 of the present invention;

[0030] Figure 4 A schematic diagram of a second unit of the three-dimensional metamaterial provided in Example 1 of the present invention;

[0031] Figure 5 A schematic diagram of a third unit of the three-dimensional metamaterial provided in Example 1 of the present invention;

[0032] Figure 6 A schematic diagram of a fourth unit of the three-dimensional metamaterial provided in Example 1 of the present invention;

[0033] Figure 7 This is a schematic diagram of the overall structure of the three-dimensional metamaterial provided in Example 1 of the present invention;

[0034] Figure 8 A schematic structural diagram of the first-layer structural unit provided in Embodiment 1 of the present invention installed on a mounting plate;

[0035] Fig. 9 A schematic diagram of a clamping structure unit of a clamping mechanism provided in Example 1 of the present invention;

[0036] Fig.10 This is a schematic diagram of an enlarged interval formed by adjacent left and right layers of structural units provided in Example 1 of the present invention.

[0037] In the figure: 1. tilting base; 2. Z-axis coarse adjustment moving knob; 3. Z-axis coarse adjustment locking knob; 4. Z-axis coarse adjustment moving platform; 5. Z-axis fine adjustment moving platform; 6. Z-axis micrometer head; 7. Z-axis fine adjustment locking knob; 8. Y-axis coarse adjustment moving knob; 9. Y-axis coarse adjustment locking knob; 10. Y-axis coarse adjustment moving platform; 11. Y-axis fine adjustment moving platform; 12. Y-axis micrometer head; 13. Y-axis fine adjustment locking knob; 14. X-axis fine adjustment moving platform; 15. X-axis fine adjustment locking knob; 16. X-axis micrometer head; 17. first fixed top screw; 18. second fixed top screw; 19. mounting plate; 20. clamping mechanism; 21. first unit; 22. second unit; 23. third unit; 24. fourth unit. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] Example 1

[0040] In a typical embodiment of the present invention, Figure 1 As shown, a laser welding method for three-dimensional metamaterials is proposed, comprising:

[0041] Step 1: Building an auxiliary welding device for assembling various structural units of three-dimensional metamaterials, the auxiliary welding device includes a tilting base 1 and a clamping mechanism 20, the tilting base 1 is provided with a mounting plate 19 for mounting the three-dimensional metamaterial and an X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism, the mounting plate 19 is connected to the X-axis moving mechanism, and the clamping mechanism 20 can move along the Y-axis direction and the Z-axis direction under the drive of the Y-axis moving mechanism and the Z-axis moving mechanism; wherein the X-axis, the Y-axis and the Z-axis are 90 degrees to each other;

[0042] Step 2, alternately mounting various structural units constituting the bottom layer of the three-dimensional metamaterial on the mounting plate 19 to form a first layer of structural units;

[0043] Step 3: Clamp the structural unit with the clamping mechanism 20, adjust the position of the clamping mechanism 20 by adjusting the Y-axis moving mechanism and the Z-axis moving mechanism, and adjust the position of the mounting plate 19 by adjusting the X-axis moving mechanism, so that the structural unit is installed from one side of the first-layer structural unit, and after installation, a laser welding device is used to perform laser welding on one side of the connection between two adjacent layers of structural units perpendicular to the horizontal bottom surface, and laser welding is performed on one side of the connection between the upper and lower adjacent layers of structural units installed each time a structural unit is installed;

[0044] Step 4: After the second-layer structural unit and the bottom-layer structural unit are installed and welded one by one, the mounting plate 19 is removed, rotated 180°, and installed on the inclined base 1, and a laser welding device is used to perform laser welding on the other side of the connection between the upper and lower adjacent structural units perpendicular to the bottom surface. The second-layer structural unit has been connected to the first-layer structural unit by one welding. This time, the laser welding device is used to weld the other side of the connection between the upper and lower adjacent structural units one by one, so that each connected structural unit of the upper and lower layers is welded twice to form the second-layer structural unit. The structural units connected in this way are very firm and stable.

[0045] Step 5: After the second layer of structural units is formed, the mounting plate 19 is removed and rotated 90°, and steps 3 and 4 are repeated to install the welded structural units to form the third layer of structural units;

[0046] Step 6: After the third layer of structural units is formed, the mounting plate 19 is removed and rotated 90 degrees, and steps 3 and 4 are repeated to mount the welded structural units to form the fourth layer of structural units.

[0047] In this embodiment, the Y-axis moving mechanism and the Z-axis moving mechanism are used to adjust the clamping mechanism 20 in the Y and Z directions, and the X-axis moving mechanism is used to adjust the mounting plate 19 along the X direction, thereby assisting the operator in positioning and installing when installing and welding the three-dimensional metamaterial structure, thereby improving the accuracy of installation and welding.

[0048] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, further, the various structural units are alternately provided with a plurality of convex structures and concave structures, and the plurality of convex structures and concave structures are provided with slots, and the various structural units are connected to each other through the slots. In this embodiment, a first unit 21, a second unit 22, a third unit 23, and a fourth unit 24 are provided.

[0049] like Figure 8 As shown, further, the concave structures and convex structures of two horizontally adjacent metamaterial structural units of the first layer structural unit are staggered.

[0050] like Figure 7 As shown, in this embodiment, each layer has a plurality of metamaterial structural units, and the concave structures and convex structures of two horizontally adjacent metamaterial structural units of the same layer are staggered, and in the two adjacent layers of metamaterial structural units, the convex structure of one layer of metamaterial structural units and the concave structure of the metamaterial structural units of the upper and lower adjacent layers are connected by a slot. The first layer structural unit and the fourth layer structural unit are composed of the third unit 23 and the fourth unit 24, and the second layer structural unit and the third layer structural unit are composed of the first unit 21 and the second unit 22.

[0051] Further, such as Figure 2 As shown, the bottom of the tilting base 1 is horizontally arranged, the top of the tilting base 1 is a planar structure with a set tilting angle, and the X-axis moving mechanism, the Y-axis moving mechanism and the Z-axis moving mechanism are arranged on the top of the tilting base 1.

[0052] like Figure 2 As shown, the inclined base 1 is set to have a certain inclination angle, and the laser welding direction of the laser welding device is perpendicular to the horizontal bottom surface of the inclined base 1. In this way, the laser of the laser welding device can be extended into the interval between the horizontally adjacent structural units to perform laser welding on the connection of the structural units without welding interference. The welding positions of the upper and lower adjacent structural units are as shown in FIG. Fig.10 The location of the callout circle is shown.

[0053] Furthermore, the tilt angle is calculated from the gap width and gap height between adjacent structural units.

[0054] like Fig.10 As shown, in this embodiment, since there is a certain interval between the structural units alternately arranged in the same layer, and the concave structures and convex structures of the two metamaterial structural units are staggered, when laser welding is performed, since the laser is vertically tilted to the horizontal bottom surface of the base 1 for welding, it is necessary to avoid welding interference between the laser and the upper part of the structural unit, that is, it is necessary to calculate the penetration range of the welding laser separately, and the laser penetration range is determined by the tilt angle of the tilt base 1. Therefore, the tilt angle needs to be calculated, specifically:

[0055] When the left structural unit is a convex structure and the right structural unit is a concave structure, the following formula is used for calculation:

[0056]

[0057] in, represents the first tilt angle, represents the interval width between two adjacent structural units, It represents the first interval height, i.e., the distance from the convex structure at the upper part of the left structural unit to the connection point of the concave structure at the lower part of the right structural unit;

[0058] When the left structural unit is a concave structure and the right structural unit is a convex structure, the following formula is used for calculation:

[0059]

[0060] in represents the second tilt angle, The second interval width is the distance from the concave structure at the upper part of the left structural unit to the convex structure at the lower part of the right structural unit;

[0061] The first tilt angle and the second tilt angle The overlapping angle range is used as the inclination angle of the inclined base 1. Such an arrangement allows the welding laser to smoothly extend into the gap between two horizontally adjacent structural units vertically and weld the connection from left to right in sequence, thereby avoiding interference between the welding laser and the upper part of the structural unit.

[0062] Furthermore, the X-axis moving mechanism includes an X-axis fine-tuning moving platform 14, on which a mounting plate 19 is arranged; an X-axis fine-tuning locking knob 15 is arranged at one end of the X-axis fine-tuning moving platform 14 away from the mounting plate 19, and an X-axis fine-tuning locking knob 15 is arranged at one end of the X-axis fine-tuning locking knob 15 away from the mounting plate 19, and an X-axis differential head 16 is arranged, and the movement of the X-axis fine-tuning platform is controlled by rotating the X-axis differential head 16.

[0063] In this embodiment, after the X-axis fine-tuning moving platform 14 is adjusted into place, the position can be locked by the X-axis fine-tuning locking knob 15 to provide precise positioning for the installation of the structural unit.

[0064] Furthermore, the Y-axis moving mechanism includes a Y-axis coarse adjustment moving platform 10, on which a Y-axis coarse adjustment locking knob 9 and a Y-axis coarse adjustment moving knob 8 are provided, a Y-axis fine adjustment moving platform 11 is provided on the side of the Y-axis coarse adjustment moving platform 10 close to the mounting plate 19, a clamping mechanism 20 is provided on the side of the Y-axis fine adjustment moving platform 11 close to the mounting plate 19, a Y-axis fine adjustment locking knob 13 and a Y-axis differential head 12 are provided on the Y-axis fine adjustment moving platform 11, and the movement of the Y-axis fine adjustment platform is controlled by rotating the Y-axis differential head 12.

[0065] In this embodiment, the Y-axis coarse adjustment moving platform 10 can be first adjusted to an approximate position through the Y-axis coarse adjustment moving knob 8, and then the position can be fixed through the Y-axis coarse adjustment locking knob 9, and then the Y-axis fine adjustment moving platform 11 can be used to make fine position adjustments. At the same time, after the adjustment is in place, the position can be locked through the Y-axis fine adjustment locking knob 13, so that the clamping mechanism 20 unit can be installed more accurately and conveniently.

[0066] Furthermore, the Z-axis moving mechanism includes a Z-axis coarse adjustment moving platform 4, on which a Z-axis coarse adjustment locking knob 3 and a Z-axis coarse adjustment moving knob 2 are provided, a Z-axis fine adjustment moving platform 5 is provided on the side of the Z-axis coarse adjustment moving platform 4 close to the mounting plate 19, and the side of the Z-axis fine adjustment moving platform 5 close to the mounting plate 19 is connected to the Y-axis moving mechanism, and the Z-axis fine adjustment moving platform 5 is provided with a Z-axis fine adjustment locking knob 7 and a Z-axis differential head 6, and the movement of the Z-axis fine adjustment platform is controlled by rotating the Z-axis differential head 6.

[0067] In this embodiment, the Z-axis moving mechanism is adjusted in the same manner as the Y-axis moving mechanism, and the position adjustment in the Z direction is also performed to assist the operator in facilitating the installation of the structural unit and improving the installation accuracy.

[0068] Furthermore, the clamping mechanism 20 is configured as a U-shaped structure with an opening facing downward, and a fixed top screw is provided at one end of the U-shaped structure away from the Y-axis moving mechanism.

[0069] like Fig. 9 As shown, in this embodiment, after the clamping mechanism 20 is installed, the fixed top screw can be adjusted to clamp the structural unit. The fixed top screw is provided with a first fixed top screw 17 at the top and a second fixed top screw 18 at the bottom. When the first unit 21 and the second unit 22 are clamped, the top screw 17 and the second fixed top screw 18 can be tightened. When the third unit 23 and the fourth unit 24 are clamped, the top screw 18 can be tightened.

[0070] In this embodiment, the Y-axis moving mechanism and the Z-axis moving mechanism are moved by a rack and pinion mechanism. With this arrangement, the movement of the Y-axis fine-tuning platform is controlled by rotating the Y-axis micrometer head, and the movement of the Z-axis fine-tuning platform is controlled by rotating the Z-axis micrometer head. The operation is simple and the transmission is stable, which effectively provides auxiliary functions for the operator during the welding and installation of the structural unit. In other embodiments of the present invention, other driving mechanisms such as cylinders can also be used to realize the movement of the clamping mechanism.

[0071] The laser welding method of a three-dimensional metamaterial proposed by the present invention adopts an auxiliary welding device. Based on the assembly method of multiple structural units, the auxiliary welding device is used to produce the three-dimensional metamaterial, which can assist operators to improve production efficiency and reduce production costs. At the same time, compared with the traditional method of assembling multiple structural units, the three-dimensional mechanical metamaterial structure obtained by welding is more stable and has better mechanical properties.

[0072] The tilting base provided by the present invention has a set tilting angle, and can cooperate with the laser welding device to extend into the gap between horizontally adjacent structural units for laser welding without welding interference. At the same time, the assembly and adjustment of the structural units are performed through the X-axis moving mechanism, the Y-axis moving mechanism, the Z-axis moving mechanism and the clamping mechanism, which can further help the operating personnel to perform positioning, installation and welding, and improve the installation accuracy.

[0073] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A laser welding method for three-dimensional metamaterials, characterized in that: include: Step 1, building an auxiliary welding device, the auxiliary welding device includes a tilting base and a clamping mechanism, the tilting base is provided with a mounting plate and an X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism, the mounting plate is connected to the X-axis moving mechanism, and the clamping mechanism can move along the Y-axis direction and the Z-axis direction under the drive of the Y-axis moving mechanism and the Z-axis moving mechanism; Step 2, alternately mounting a plurality of structural units constituting the bottom layer of the three-dimensional metamaterial on a mounting plate to form a first layer of structural units; Step 3: Clamp the structural unit with a clamping mechanism, adjust the position of the clamping mechanism by adjusting the Y-axis moving mechanism and the Z-axis moving mechanism, and adjust the position of the mounting plate by adjusting the X-axis moving mechanism, so that the structural unit is installed from one side of the first-layer structural unit, and after installation, a laser welding device is used to perform laser welding on one side of the connection between two adjacent layers of structural units perpendicular to the horizontal bottom surface, and laser welding is performed on one side of the connection between the upper and lower adjacent layers of structural units installed each time a structural unit is installed; Step 4: After the second-layer structural unit and the bottom-layer structural unit are installed and welded one by one, the mounting plate is removed, rotated 180°, and then installed on the inclined base, and a laser welding device is used to perform laser welding on the other side of the connection between the upper and lower adjacent structural units perpendicular to the bottom surface to form the second-layer structural unit; Step 5: After the second layer of structural units is formed, remove the mounting plate and rotate it 90°, and repeat steps 3 and 4 to install the welded structural units to form the third layer of structural units; Step 6: After the third layer of structural units is formed, remove the mounting plate and rotate it 90 degrees, and repeat steps 3 and 4 to install the welded structural units to form the fourth layer of structural units.

2. A laser welding method for three-dimensional metamaterials according to claim 1, characterized in that: The various structural units are alternately provided with a plurality of convex structures and concave structures, the plurality of convex structures and concave structures are provided with card slots, and the various structural units are connected to each other through the card slots.

3. A laser welding method for three-dimensional metamaterials as claimed in claim 2, characterized in that: The concave structures and convex structures of two horizontally adjacent metamaterial structural units of the first layer structural unit are staggered.

4. A laser welding method for three-dimensional metamaterials according to claim 1, characterized in that: The bottom of the tilting base is horizontally arranged, the top of the tilting base is a plane structure with a set tilting angle, and the X-axis moving mechanism, the Y-axis moving mechanism and the Z-axis moving mechanism are all arranged on the top of the tilting base.

5. A laser welding method for three-dimensional metamaterials as claimed in claim 4, characterized in that: The tilt angle is calculated from the gap width and gap height between adjacent structural units.

6. The laser welding method of a three-dimensional metamaterial according to claim 1, characterized in that: The X-axis moving mechanism includes an X-axis fine-tuning moving platform, on which a mounting plate is arranged; an X-axis fine-tuning locking knob is arranged at one end of the X-axis fine-tuning moving platform away from the mounting plate, and an X-axis micrometer head is arranged at one end of the X-axis fine-tuning locking knob away from the mounting plate, and the movement of the X-axis fine-tuning platform is controlled by rotating the X-axis micrometer head.

7. The laser welding method of a three-dimensional metamaterial according to claim 1, characterized in that: The Y-axis moving mechanism includes a Y-axis coarse adjustment moving platform, on which a Y-axis coarse adjustment locking knob and a Y-axis coarse adjustment moving knob are provided, a Y-axis fine adjustment moving platform is provided on the side of the Y-axis coarse adjustment moving platform close to the mounting plate, a clamping mechanism is provided on the side of the Y-axis fine adjustment moving platform close to the mounting plate, a Y-axis fine adjustment locking knob and a Y-axis micrometer head are provided on the Y-axis fine adjustment moving platform, and the movement of the Y-axis fine adjustment platform is controlled by rotating the Y-axis micrometer head.

8. The laser welding method of a three-dimensional metamaterial according to claim 1, characterized in that: The Z-axis moving mechanism includes a Z-axis coarse adjustment moving platform, on which a Z-axis coarse adjustment locking knob and a Z-axis coarse adjustment moving knob are provided, a Z-axis fine adjustment moving platform is provided on the side of the Z-axis coarse adjustment moving platform close to the mounting plate, the side of the Z-axis fine adjustment moving platform close to the mounting plate is connected to the Y-axis moving mechanism, a Z-axis fine adjustment locking knob and a Z-axis micrometer head are provided on the Z-axis fine adjustment moving platform, and the movement of the Z-axis fine adjustment platform is controlled by rotating the Z-axis micrometer head.

9. The laser welding method of three-dimensional metamaterial according to claim 1, characterized in that: The clamping mechanism is configured as a U-shaped structure with an opening downward, and a fixed top screw is provided at one end of the U-shaped structure away from the Y-axis moving mechanism.

10. The laser welding method of three-dimensional metamaterial according to claim 1, characterized in that: The Y-axis moving mechanism and the Z-axis moving mechanism are moved by using a gear rack mechanism.

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