Printing method for selectively and locally optimized face-centered cubic dot matrix

Abstract

The invention provides a printing method of a face-centered cubic dot matrix subjected to selective local optimization. The method comprises the steps of obtaining a lattice structure model of a target printed object; and simulating a stress concentration path of the lattice structure model from an elastic deformation state to a yield state. And decomposing the bearing pillars in the lattice structure model into non-main bearing pillars and main bearing pillars according to the stress concentration path. And at least part of the structure of the main bearing supporting column is subjected to reducing optimization treatment, so that the optimized main bearing supporting column is obtained. And the non-main bearing supporting column and the optimized main bearing supporting column are subjected to slicing treatment to obtain multiple layers of slices, and the multiple layers of slices are printed layer by layer to obtain the target printed object. According to the method provided by the invention, the structural strength of the lattice structure can be optimized and improved, so that the non-deformability of the target printed object in the application process is enhanced, and the risk that the target printed object cracks or fractures is reduced.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a printing method of a face-centered cubic lattice after selective local optimization. Background Art

[0002] Lightweight design of materials is an unchanging design goal for high-end mechanical parts such as spacecraft. Among them, the lattice structure formed by additive manufacturing provides a solution for the lightweight of spacecraft. In the face of the complex working environment of aircraft, the lattice structure needs to play a safe and reliable role in a variety of service environments.

[0003] Although existing technologies such as cell hybridization and innovative cell topology can improve the safety performance of lattice structures, the introduction of too many geometric features can easily lead to large-angle cantilever structures, which will make it difficult to form the lattice structure and difficult to apply in practical applications. Summary of the invention

[0004] The present application provides a method for printing a face-centered cubic lattice through selective local optimization, which can optimize and improve the structural strength of the lattice structure.

[0005] Specifically, the present application is implemented through the following technical solutions: On one hand, the present application provides a method for printing a face-centered cubic lattice after selective local optimization, comprising: Obtaining a dot matrix structure model of a target printed object; Simulating the stress concentration path of the lattice structure model from the elastic deformation state to the yield state; decomposing the load-bearing pillars in the lattice structure model into non-main load-bearing pillars and main load-bearing pillars according to the stress concentration path; Performing diameter-variable optimization processing on at least a portion of the structure of the main bearing pillar to obtain an optimized main bearing pillar; The non-main load-bearing pillar and the optimized main load-bearing pillar are sliced ​​separately to obtain multi-layer slices, and the multi-layer slices are printed layer by layer to obtain the target printed object.

[0006] Optionally, the stress concentration path includes a stress concentration starting position and a stress concentration ending position; The main bearing support includes a node portion located at the starting position of the stress concentration and a middle portion located at the ending position of the stress concentration; The variable diameter optimization processing of at least a part of the structure of the main bearing pillar includes: optimizing the diameter of the node part and / or the middle part so that the diameter of the node part is not equal to the diameter of the middle part.

[0007] Optionally, the main load-bearing strut further comprises a transition portion, the transition portion being located between the node portion and the middle portion; The variable diameter optimization treatment of at least a portion of the structure of the main bearing support further includes: optimizing the diameter of the transition portion so that the transition portion is formed into a tapered section that gradually extends from the node portion to the middle portion.

[0008] Optionally, the diameter of the non-main load-bearing strut is a constant diameter; Optimizing the diameter of the node portion and / or the middle portion includes: performing a diameter expansion process on one of the node portion and the middle portion, and maintaining the other portion with the same diameter as the non-main load-bearing strut.

[0009] Optionally, the diameter of one of the node portion and the middle portion is d1, and the diameter of the other is d2, satisfying d1=(2-4)d2.

[0010] Optionally, printing the multi-layer slices layer by layer includes: The multi-layer slices are printed layer by layer from bottom to top using laser process parameters of laser power of 220-240 W, scanning spacing of 80-100 μm, and scanning speed of 800-900 mm / s.

[0011] Optionally, before printing the multi-layer slices layer by layer, the method further includes: Aluminum-magnesium-sc-zirconium metal powder with a powder layer thickness of 30-35 μm is provided at each slice layer. The aluminum-magnesium-sc-zirconium metal powder includes the following elements by weight percentage: Mg is 4-4.2%, Si is 0.6-0.62%, Zr is 0.2-0.22%, Fe is 0-0.02%, and the balance is Al.

[0012] On the other hand, the present application provides a 3D printing system, comprising: A dot matrix structure model acquisition module is used to acquire a dot matrix structure model of a target printed object; A lattice structure model simulation and decomposition module, used to simulate the stress concentration path of the lattice structure model from the elastic deformation state to the yield state; decompose the load-bearing pillars in the lattice structure model into non-main load-bearing pillars and main load-bearing pillars according to the stress concentration path; An optimization processing module, used for performing diameter-variable optimization processing on at least a part of the structure of the main bearing pillar to obtain an optimized main bearing pillar; The printing module is used to slice the non-main load-bearing pillars and the optimized main load-bearing pillars respectively to obtain multi-layer slices, and print the multi-layer slices layer by layer to obtain the target printed object.

[0013] On the other hand, the present application further provides a storage medium on which a computer program is stored. When the computer program is run, the printing method of the selectively locally optimized face-centered cubic lattice as described above is executed.

[0014] On the other hand, the present application also provides an electronic device, including a memory and a processor, wherein the memory is used to store computer instructions; the processor is used to run the computer instructions to execute any of the above-described selectively locally optimized face-centered cubic lattice printing methods.

[0015] The technical solution provided by this application can achieve the following beneficial effects: The present application provides a printing method of a face-centered cubic lattice that has been selectively locally optimized, which can optimize and improve the structural strength of the lattice structure, thereby enhancing the deformation resistance of the target printed object during the application process and reducing the risk of cracks or breakage of the target printed object. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic flow chart of a method for printing a face-centered cubic lattice after selective local optimization, shown in an exemplary embodiment of the present application.

[0017] Figure 2 It is a schematic diagram of an existing conventional face-centered cubic rod lattice structure shown in an exemplary embodiment of the present application.

[0018] Among them, Figure (2-a) is a schematic diagram of the existing conventional face-centered cubic rod lattice structure model; Figure (2-b) is a stress concentration distribution diagram of the existing conventional face-centered cubic rod lattice structure in an elastic deformation state; Figure (2-c) is a stress concentration distribution diagram of the existing conventional face-centered cubic rod lattice structure in a yield state.

[0019] Figure 3 It is a schematic diagram of an optimized lattice structure shown in an exemplary embodiment of the present application.

[0020] Among them, Figure (3-a) is a schematic diagram of the lattice structure in which the middle part, i.e., the edge, of the main bearing pillar is expanded; Figure (3-b) is a schematic diagram of the lattice structure in which the node part of the main bearing pillar is expanded.

[0021] Figure 4 It is a stress-strain curve of the quasi-static compression process of the lattice obtained by conducting a comparative experiment on an existing conventional face-centered cubic rod lattice structure shown in an exemplary embodiment of the present application, a lattice structure in which the middle part, i.e., the edge, of the main load-bearing support is expanded, and a lattice structure in which the node part of the main load-bearing support is expanded.

[0022] Figure 5It is a lattice deformation and failure diagram under different strains obtained by conducting comparative experiments on an existing conventional face-centered cubic rod lattice structure, a lattice structure in which the middle part, i.e., the edge, of the main load-bearing support is expanded, and a lattice structure in which the node part of the main load-bearing support is expanded, as shown in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments (or "implementation methods") of the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0024] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0025] See also Figure 1 The present application provides a method for printing a face-centered cubic lattice after selective local optimization, comprising: S1: Obtaining a dot matrix structure model of a target printed object. For example, the target printed object may be a partial component or an entire component of any high-end machinery in a spacecraft, such as but not limited to an engine. Of course, in other examples, the target printed object may also be a partial component or an entire component in other mechanical fields besides the spacecraft field.

[0026] The above-mentioned lattice structure model refers to a space frame model formed by a plurality of regular or irregular geometric units (i.e., cells) arranged in a specific topological manner, which is widely used in the fields of material science and additive manufacturing (3D printing). Exemplarily, the lattice structure model can be a face-centered cubic lattice structure model, but it is not limited to this. Among them, the lattice structure model can be constructed using existing three-dimensional mapping software, such as but not limited to UG (Unigraphics NX) software, and no further elaboration is given here.

[0027] S2: simulating the stress concentration path of the lattice structure model from the elastic deformation state to the yield state; decomposing the load-bearing pillars in the lattice structure model into non-main load-bearing pillars and main load-bearing pillars according to the stress concentration path.

[0028] For example, Figure 2 -a, in the lattice structure model, the lattice structure model composed of multiple load-bearing struts belongs to the bar lattice structure model. By using existing mathematical simulation methods, such as but not limited to finite element analysis methods, the static simulation analysis of the bar lattice structure model is performed to simulate the propagation path of the stress of the bar lattice structure model along certain specific geometric features under the compression state of specific load conditions, and obtain the stress concentration path of the bar lattice structure model from the elastic deformation state to the yield state. Among them, the stress concentration path of the bar lattice structure model in the elastic deformation state under 2% strain is as follows Figure 2 -b, the stress concentration path of the bar lattice structure model in the yield state is as follows Figure 2 -c. According to the obtained stress concentration path, the bearing pillars in the bar lattice structure model are decomposed into non-main bearing pillars 12 and main bearing pillars 11. Among them, the non-main bearing pillars 12 are cross-arranged, and the main bearing pillars 11 are vertically arranged, but not limited to this.

[0029] The elastic deformation state refers to a reversible elastic deformation of a material when it is subjected to an external force. The yield state refers to the irreversible plastic deformation of the material when the stress on the material reaches a certain yield strength, i.e., a critical value.

[0030] S3: Performing diameter-changing optimization processing on at least a portion of the structure of the main bearing pillar to obtain an optimized main bearing pillar.

[0031] See also Figure 2 In the existing lattice structure model, the diameters of the main bearing pillar 11 and the non-main bearing pillar 12 are the same. When the main bearing pillar 11 and the non-main bearing pillar 12 are designed with the same and constant diameter, under the elastic deformation state, a large stress concentration will occur at the connection node between the main bearing pillar 11 and the non-main bearing pillar 12 (such as Figure 2 -b orange-yellow area), while in the yield state, the stress concentration will be transferred from the position of the main bearing support 11 close to the connection node to the middle part of the main bearing support 11 (as shown in FIG. Figure 2 -c shown in red).

[0032] The present application can disperse the stress concentration of the main bearing pillar 11 and change the propagation path of the stress concentration by performing diameter-changing optimization processing on at least part of the structure of the main bearing pillar 11. By performing targeted structural optimization on the main bearing pillar 11, the strength control requirements of the target printed object can be met. At the same time, the initial structural characteristics of the non-main bearing pillar 12 can be retained as much as possible, thereby ensuring the convenience of printing processing and ensuring the high-quality forming of the high-performance dot matrix structure.

[0033] S4: Slicing the non-main bearing pillar and the optimized main bearing pillar separately to obtain multi-layer slices, and printing the multi-layer slices layer by layer to obtain the target printed object.

[0034] Exemplarily, printing can be performed using a process including but not limited to L-PBF additive manufacturing to obtain a complete target printed object formed by a combination of a main load-bearing pillar region and a non-main load-bearing pillar region, wherein the combination of the main load-bearing pillar region and the non-main load-bearing pillar region has no obvious dividing line, and during the layer-by-layer printing process, the main load-bearing pillar region and the non-main load-bearing pillar region are tightly combined.

[0035] The above-mentioned layer-by-layer printing refers to providing a first layer of printing material powder on the operating table of the 3D printing device and sintering it into a preset pattern with a laser. Then, a second layer of printing material powder is provided on top of the first layer and sintered into a preset pattern with a laser. The above-mentioned printing operation is repeated until the printing of the main bearing support area and the non-main bearing support area is completed to form a complete target printed object.

[0036] The above method provided in the present application can optimize and improve the structural strength of the dot matrix structure while achieving a lightweight design, thereby enhancing the deformation resistance of the target printed object during the application process and reducing the risk of cracks or breakage of the target printed object.

[0037] In one embodiment, the stress concentration path includes a stress concentration starting position and a stress concentration ending position. Figure 3 The main bearing support 11 includes a node portion 111 located at the starting position of the stress concentration, and a middle portion 112 located at the ending position of the stress concentration.

[0038] In the above step S3, performing diameter-variable optimization processing on at least part of the structure of the main support pillar 11 includes: optimizing the diameter of the node portion 111 and / or the middle portion 112, so that the diameter of the node portion 111 is not equal to the diameter of the middle portion 112. Thus, the diameter of the node portion 111 and / or the diameter of the middle portion 112 can be optimized differently according to different usage requirements of the target printed object under different working conditions.

[0039] For example, Figure 3 -a, the diameter of the node portion 111 is smaller than the diameter of the middle portion 112. In other examples, such as Figure 3 As shown in FIG. 1-b, the diameter of the node portion 111 is greater than the diameter of the middle portion 112. The diameter of the node portion 111 can be appropriately selected according to the specific structural strength requirements of the target printed object.

[0040] Please continue reading Figure 3In one embodiment, the main load-bearing pillar 11 further includes a transition portion 113 , and the transition portion 113 is located between the node portion 111 and the middle portion 112 .

[0041] In the above step S3, the variable diameter optimization processing of at least part of the structure of the main bearing pillar 11 also includes: optimizing the diameter of the transition part 113 so that the transition part 113 is formed into a tapered section gradually extending from the node part 111 to the middle part 112.

[0042] The tapered section refers to a truncated cone structure formed by uniformly changing the diameter of the transition portion 113 from the node portion 111 to the middle portion 112. By designing the transition portion 113 between the node portion 111 and the middle portion 112 as a tapered section with uniformly changing diameter, stress concentration caused by sudden shape change can be reduced.

[0043] Please continue reading Figure 3 In one embodiment, the diameter of the non-main bearing pillar 12 is a constant diameter. Optimizing the diameter of the node portion 111 and / or the middle portion 112 includes: expanding the diameter of one of the node portion 111 and the middle portion 112, and maintaining the same diameter of the other as the non-main bearing pillar 12. For example, Figure 3 -a, the diameter of the node portion 111 is smaller than the diameter of the middle portion 112, and the diameter of the node portion 111 is the same as the diameter of the non-main load-bearing support 12. In other examples, such as Figure 3 -b, the diameter of the node portion 111 is greater than the diameter of the middle portion 112, and the diameter of the middle portion 112 is the same as the diameter of the non-main bearing pillar 12. Thus, the original structural features of the non-main bearing pillar 12 are retained, the convenience of printing and processing is guaranteed, and the high-quality formation of the high-performance dot matrix structure is ensured.

[0044] Of course, in other embodiments, one of the node portion 111 and the middle portion 112 may be reduced in diameter according to actual use requirements of the target printed material.

[0045] It should be noted that Figure 3 -a and Figure 3 -b shows an enlarged view of the structure of a portion of the main support pillars of a cell in the lattice structure. The lattice structure is formed by four cells enclosed and spliced ​​together, and the main support pillar 11 formed by the lattice structure has four times the volume of the portion of the main support pillars of a cell.

[0046] See also Figure 4 , using Figure 2The conventional face-centered cubic lattice structure model shown in FIG. 1 has the same diameters for the main bearing pillars and the non-main bearing pillars, and has a high stress at a strain of 10%. Figure 3 The optimized lattice with the edge center as the target shown in -a, that is, the diameter of the node part is smaller than the diameter of the middle part, and the diameter of the node part is the same as the diameter of the non-main load-bearing pillar, has a lower stress at a strain of 10%. Figure 3 The node-targeted optimization lattice shown in -b, where the diameter of the node part is larger than the diameter of the middle part, and the diameter of the middle part is the same as the diameter of the non-main load-bearing strut, also has lower stress at 10% strain.

[0047] like Figure 5 As shown, using Figure 2 In the conventional face-centered cubic lattice structure model shown in FIG, the diameters of the main bearing pillars and the non-main bearing pillars are the same. Under different strains, the main bearing pillars undergo buckling, shear failure and plastic deformation. Figure 3 -a shows the optimized lattice with the edge center as the target, that is, the diameter of the node part is smaller than the diameter of the middle part, and the diameter of the node part is the same as the diameter of the non-main bearing pillar. Under different strains, the main bearing pillars show good structural stability. Figure 3 -b shows an optimized lattice with nodes as the target, i.e., the diameter of the node part is larger than that of the middle part, and the diameter of the middle part is the same as the diameter of the non-main load-bearing pillar. Only slight shear failure occurs under a strain of 15%. Compared with the existing conventional face-centered cubic lattice structure model, the strength of the main load-bearing pillar is further improved.

[0048] In one embodiment, the diameter of one of the node part and the middle part is d1, and the diameter of the other is d2, satisfying d1=(2~4)d2. The specific strength of the lattice structure depends on the volume fraction and the maximum bearing capacity of the lattice structure. The increase in the cross-sectional radius of the middle part of the main bearing support, that is, the middle of the edge, will lead to an increase in the maximum bearing capacity of the lattice structure, but the increase in the volume fraction of the lattice structure must be considered at the same time. When the cross-sectional radius of the middle part of the main bearing support, that is, the middle of the edge, increases by more than a certain critical value, the increase in the maximum bearing capacity will be lower than the increase in the volume fraction, which will reduce the specific strength of the lattice structure. Therefore, the present application limits the diameters of the node part and the middle part to the above range, which can achieve the maximum bearing capacity per unit volume of the lattice structure while making the lattice structure lightweight.

[0049] For example, Figure 3-a, taking the side length of each lattice cell as 8 mm, the number of cells in each direction (i.e., the x-axis direction, the y-axis direction, and the z-axis direction) as 4, and using the method disclosed in the present invention to optimize and print to obtain a lattice structure of 32 mm × 32 mm × 32 mm as an example: The side length of each cell, i.e. the length of the main bearing pillar, is L, which is 8 mm. The diameter d of the non-main bearing pillar is 0.8 mm. The angle between the non-main bearing pillar and the horizontal plane is 45°. The diameter of the node part is d1=d, then d1 max =(L / 2)-(d / ), that is, d1 max It is approximately 3.43 mm. Therefore, when achieving the maximum load-bearing capacity per unit volume of the lattice structure, interference with non-main load-bearing pillars can be avoided as much as possible.

[0050] In one embodiment, printing the multi-layer slice layer by layer includes: using laser process parameters of laser power of 220-240W, scanning spacing of 80-100μm, and scanning speed of 800-900mm / s to print the multi-layer slice layer by layer from bottom to top. Thus, a target printed object with a better structure can be printed.

[0051] In one embodiment, before printing the multi-layer slices layer by layer, it also includes: providing an aluminum-magnesium-sc-z-i metal powder with a powder layer thickness of 30-35 μm at each slice layer, wherein the aluminum-magnesium-sc-z-i metal powder includes the following elements by weight percentage: Mg is 4-4.2%, Si is 0.6-0.62%, Zr is 0.2-0.22%, Fe is 0-0.02%, and the balance is Al.

[0052] In one embodiment, the present application provides a 3D printing system, comprising: A dot matrix structure model acquisition module is used to acquire a dot matrix structure model of a target printed object; A lattice structure model simulation and decomposition module, used to simulate the stress concentration path of the lattice structure model from the elastic deformation state to the yield state; decompose the load-bearing pillars in the lattice structure model into non-main load-bearing pillars and main load-bearing pillars according to the stress concentration path; An optimization processing module, used for performing diameter-variable optimization processing on at least a part of the structure of the main bearing pillar to obtain an optimized main bearing pillar; The printing module is used to slice the non-main load-bearing pillars and the optimized main load-bearing pillars respectively to obtain multi-layer slices, and print the multi-layer slices layer by layer to obtain the target printed object.

[0053] In one embodiment, the present application provides a storage medium having a computer program stored thereon, wherein when the computer program is run, the printing method of the face-centered cubic lattice with selective local optimization as described above is executed. The storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center that includes one or more available media sets.

[0054] In one embodiment, the present application provides an electronic device including a memory and a processor, wherein the memory is used to store computer instructions; the processor is used to run the computer instructions to execute any of the above-described selectively locally optimized face-centered cubic lattice printing methods.

[0055] The memory can be ROM (Read Only Memory), RAM (Random Access Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory), or disk storage media.

[0056] The processor can be a CPU (Central Processing Unit), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.

[0057] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A method for printing a face-centered cubic dot matrix by selective local optimization, characterized in that: include: Obtaining a dot matrix structure model of a target printed object; Simulating the stress concentration path of the lattice structure model from the elastic deformation state to the yield state; Decomposing the load-bearing pillars in the lattice structure model into non-main load-bearing pillars and main load-bearing pillars according to the stress concentration path; Performing diameter-variable optimization processing on at least a portion of the structure of the main bearing pillar to obtain an optimized main bearing pillar; The non-main load-bearing pillars and the optimized main load-bearing pillars are sliced ​​separately to obtain multi-layer slices, and the multi-layer slices are printed layer by layer to obtain the target printed object.

2. The method for printing a face-centered cubic lattice through selective local optimization according to claim 1, characterized in that: The stress concentration path includes a stress concentration starting position and a stress concentration ending position; The main bearing support includes a node portion located at the starting position of the stress concentration, and a middle portion located at the ending position of the stress concentration; The variable diameter optimization processing of at least a part of the structure of the main bearing pillar includes: optimizing the diameter of the node part and / or the middle part so that the diameter of the node part is not equal to the diameter of the middle part.

3. The method for printing a face-centered cubic lattice through selective local optimization according to claim 2, characterized in that: The main load-bearing strut also includes a transition portion, the transition portion being located between the node portion and the intermediate portion; The variable diameter optimization treatment of at least a portion of the structure of the main bearing support further includes: optimizing the diameter of the transition portion so that the transition portion is formed into a tapered section that gradually extends from the node portion to the middle portion.

4. The method for printing a selectively locally optimized face-centered cubic lattice according to claim 2 or 3, characterized in that: The diameter of the non-main load-bearing pillar is a constant diameter; Optimizing the diameter of the node portion and / or the middle portion includes: performing a diameter expansion process on one of the node portion and the middle portion, and maintaining the other portion with the same diameter as the non-main load-bearing strut.

5. The method for printing a face-centered cubic lattice through selective local optimization according to claim 4, characterized in that: The diameter of one of the node portion and the middle portion is d1, and the diameter of the other is d2, satisfying d1=(2-4)d2.

6. The method for printing a face-centered cubic lattice through selective local optimization according to claim 1, characterized in that: Printing the multi-layer slices layer by layer includes: The multi-layer slices are printed layer by layer from bottom to top using laser process parameters of laser power of 220-240 W, scanning spacing of 80-100 μm, and scanning speed of 800-900 mm / s.

7. The method for printing a face-centered cubic lattice through selective local optimization according to claim 1, characterized in that: Before printing the multi-layer slices layer by layer, the method further includes: Aluminum-magnesium-sc-zirconium metal powder with a powder layer thickness of 30-35 μm is provided at each slice layer. The aluminum-magnesium-sc-zirconium metal powder includes the following elements by weight percentage: Mg is 4-4.2%, Si is 0.6-0.62%, Zr is 0.2-0.22%, Fe is 0-0.02%, and the balance is Al.

8. A 3D printing system, characterized in that: include: A dot matrix structure model acquisition module is used to acquire a dot matrix structure model of a target printed object; A lattice structure model simulation and decomposition module, used to simulate the stress concentration path of the lattice structure model from the elastic deformation state to the yield state; Decomposing the load-bearing pillars in the lattice structure model into non-main load-bearing pillars and main load-bearing pillars according to the stress concentration path; An optimization processing module, used for performing diameter-variable optimization processing on at least a part of the structure of the main bearing pillar to obtain an optimized main bearing pillar; The printing module is used to slice the non-main load-bearing pillars and the optimized main load-bearing pillars respectively to obtain multi-layer slices, and print the multi-layer slices layer by layer to obtain the target printed object.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is run, the method for printing a selectively locally optimized face-centered cubic lattice according to any one of claims 1 to 7 is executed.

10. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store computer instructions; and the processor is used to run the computer instructions to execute the printing method of the selectively locally optimized face-centered cubic lattice according to any one of claims 1 to 7.

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