SLM Multi-Scale Digital Organizational Structure Customization Method Based on Ultrasonic Composite

Abstract

The present invention discloses a method for customizing multi-scale digital organizational structures based on ultrasonic composite in SLM, belonging to the technical field of composite laser additive manufacturing. The method includes: designing a three-dimensional fine-grained skeleton structure that conforms to the characteristics of fine-grained structures according to the part model; performing a Boolean operation on the three-dimensional fine-grained skeleton structure and the part model to obtain a formed matrix structure; slicing the formed matrix structure and the three-dimensional fine-grained skeleton structure obtained after the Boolean operation respectively according to the actual relative positions in the same three-axis coordinate to obtain two slice data; according to the two slice data, in-situ composite the formed matrix structure or the part model obtained after the Boolean operation and the three-dimensional fine-grained skeleton structure to complete the printing preparation; controlling the ultrasonic composite SLM forming system to perform printing until the printing is completed. The present invention uses ultrasound to form specially customized refined sub-grains and grain structures, realizing multi-scale digital customization of grain, three-dimensional microstructures in regions, and macroscopic crystal structure composites.

Description

Technical Field

[0001] The present invention relates to the technical field of composite laser additive manufacturing, and particularly to a method for customizing multi-scale digital organizational structures of SLM based on ultrasonic compounding. Background Art

[0002] Selective laser melting (SLM) is a main technical approach in laser additive manufacturing. This technology uses a laser beam as the main energy source and scans specific areas on a powder bed based on the sliced data of a three-dimensional model, causing the metal powder to melt and solidify into a part.

[0003] Laser selective melting is a layer-by-layer additive forming process. In its forming system during conventional forming, the protective atmosphere fills the forming cavity. First, the forming cylinder descends by one layer thickness, then a layer of powder is laid on the powder bed by a powder spreading vehicle, and then the laser scanning system is turned on to scan the specified area on the powder bed according to the sliced data, causing the powder to absorb energy, melt, and solidify into a part. This process is repeated until the part forming is completed.

[0004] Laser selective melting technology has advantages such as high forming accuracy and good forming quality, and has the ability to manufacture complex structures that traditional subtractive manufacturing does not possess. However, SLM forming is a rapid melting and solidification process, and its cooling and solidification rate can reach 103 - 108 °C / s. There is a huge temperature gradient between the center and the edge of the molten pool surface, which easily causes the grains to grow into long columnar crystals along the temperature gradient direction (tending to the <001> direction) in the molten pool, resulting in anisotropy of the microstructure and mechanical properties. The large differences in mechanical properties in all directions also limit the practical application of laser selective melting parts. Summary of the Invention

[0005] To solve at least one of the technical problems existing in the prior art to a certain extent, the purpose of the present invention is to provide a method for customizing multi-scale digital organizational structures of SLM based on ultrasonic compounding.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A method for customizing multi-scale digital organizational structures of SLM based on ultrasonic compounding includes the following steps:

[0008] Obtain the part model to be processed, and design a three-dimensional fine-grained skeleton structure that conforms to the characteristics of a fine-grained structure according to the part model;

[0009] Perform a Boolean operation on the three-dimensional fine-grained skeleton structure and the part model to obtain a formed matrix structure;

[0010] Slice the formed matrix structure and the three-dimensional fine-grained skeleton structure obtained after Boolean operation according to their actual relative positions in the same three-axis coordinate system to obtain two slice data;

[0011] According to the two slice data, perform in-situ composite of the formed matrix structure or part model obtained after Boolean operation and the three-dimensional fine-grained skeleton structure to complete the printing preparation;

[0012] Control the ultrasonic composite SLM forming system to perform printing until the printing is completed.

[0013] Furthermore, the ultrasonic composite SLM forming system includes:

[0014] A laser for generating laser;

[0015] A forming cylinder with a forming platform inside, which is used to support the powder bed and place the formed part of the part structure;

[0016] A forming cavity, in which a powder spreading unit is provided, and the powder spreading unit is used to spread metal powder onto the forming platform in the forming cylinder to form a powder bed;

[0017] An ultrasonic device for generating ultrasonic waves acting on the molten pool; wherein, the opening or closing of the ultrasonic device is controlled according to the slice data of the three-dimensional fine-grained skeleton structure.

[0018] Furthermore, the ultrasonic device is connected to the substrate for placing the workpiece to be processed, and the ultrasonic waves generated by the ultrasonic device are transmitted through the substrate and the part to the molten pool and act on it.

[0019] Furthermore, the ultrasonic device is installed in the forming cavity, and the ultrasonic vibrator of the ultrasonic device has the functions of ultrasonic focusing and scanning movement. The generated ultrasonic waves are transmitted to the molten pool according to the slice data of the three-dimensional fine-grained skeleton structure at a preset focal length through the gas medium and act on it.

[0020] Furthermore, controlling the ultrasonic composite SLM forming system to perform printing includes:

[0021] When the ultrasonic composite SLM forming system scans the slice trajectory of the three-dimensional fine-grained skeleton structure, turn on the ultrasonic device and act on the molten pool.

[0022] Furthermore, the in-situ composite of the formed matrix structure and the three-dimensional fine-grained skeleton structure according to the two slice data includes:

[0023] Import the obtained slice data into the preset printing control software respectively, and by setting the position coordinates of the slice data center in the printing coordinate system, the in-situ composite of the formed matrix structure and the three-dimensional fine-grained skeleton structure is achieved.

[0024] Furthermore, the remelting method is adopted to realize the ultrasonic composite SLM customization of the three-dimensional fine-grained skeleton structure:

[0025] The sliced data of the part model and the three-dimensional fine-grained skeleton structure are simultaneously imported into the preset printing control software, and the printing order is set to first scan and form the matrix structure; since there are overlapping parts between the part model and the three-dimensional fine-grained skeleton structure, scanning the overall part area first and then the three-dimensional fine-grained skeleton structure will remelt the sliced area of the three-dimensional fine-grained skeleton structure on the already formed overall part area. At this time, the ultrasonic device is in the on state, and ultrasonic composite remelting realizes grain refinement in specific areas, achieving the fine-grain customization of the three-dimensional fine-grained skeleton structure.

[0026] Furthermore, the forming method is adopted to realize the ultrasonic composite SLM customization of the three-dimensional fine-grained skeleton structure:

[0027] After completing the structural design of the part model and the three-dimensional fine-grained skeleton structure model, an exclusion Boolean operation is performed on the two models to obtain a formed matrix structure with the three-dimensional fine-grained skeleton structure hollowed out;

[0028] After slicing the hollowed matrix model and the three-dimensional fine-grained skeleton structure model, they are imported into the preset printing control software. At this time, there is no overlapping part between the formed matrix structure and the three-dimensional fine-grained skeleton structure;

[0029] The printing order is set to first scan the hollowed formed matrix structure. At this time, the hollowed formed matrix structure and the three-dimensional fine-grained skeleton structure will be formed successively. When the laser scans the three-dimensional fine-grained skeleton structure, the ultrasonic device wave is turned on to realize ultrasonic composite SLM forming, and the preparation of the ultrasonic composite grain refinement structure is realized during the forming.

[0030] The beneficial effects of the present invention are as follows: The present invention uses ultrasound to form specially customized refined sub-grains and grain structures, realizing multi-scale digital customization of grain, regional three-dimensional microstructures, and macroscopic crystal structure composites. By customizing "crystal structure composites" with different grain structures in different regions, the "fine-grained skeleton structure" is introduced into the material matrix formed by conventional SLM, realizing the complementarity and correlation between the fine-grained structure and the matrix structure and obtaining excellent comprehensive performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following introduces the related technical solution drawings in the embodiments of the present invention or the prior art. It should be understood that the drawings introduced below only conveniently and clearly illustrate some embodiments of the technical solutions in the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1It is a schematic diagram of an implementation method of the ultrasonic composite SLM forming system in the embodiments of the present invention;

[0033] Figure 2 It is a schematic diagram of a second implementation method of the ultrasonic composite SLM forming system in the embodiments of the present invention;

[0034] Figure 3 It is a schematic diagram of realizing the ultrasonic composite SLM customization of a three-dimensional "fine-grained skeleton structure" by the remelting method in the embodiments of the present invention;

[0035] Figure 4 It is a schematic diagram of realizing the ultrasonic composite SLM customization of a three-dimensional "fine-grained skeleton structure" by the forming method in the embodiments of the present invention;

[0036] Figure 5 It is a step flowchart of a method for customizing the multi-scale digital tissue structure of SLM based on ultrasonic composite in the embodiments of the present invention. Detailed implementation manners

[0037] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention. For the step numbers in the following embodiments, they are only set for the convenience of explanation and illustration, and no limitation is imposed on the order between the steps. The execution order of each step in the embodiments can be adjusted adaptively according to the understanding of those skilled in the art.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship involved, such as up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0039] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the present number, and "above", "below", "within", etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence of the indicated technical features.

[0040] In addition, in the description of the present invention, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0041] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "install", "connect", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0042] The composite laser additive manufacturing technology takes additive manufacturing as the main process, and uses one or more auxiliary processes to work in coupling and coordination with the additive manufacturing process during the part manufacturing process, so as to optimize the process and improve the part performance. The ultrasonic composite laser selective melting technology is to introduce the action of ultrasonic waves during the laser selective melting or remelting process, and use the cavitation, acoustic streaming, and vibration effects generated by ultrasonic waves in the liquid metal to stir the melt, thereby reducing the temperature difference and temperature gradient of the molten pool, making the grain structure uniform and refined, disrupting the texture orientation, eliminating micro-defects, reducing residual stress, and improving anisotropy.

[0043] Therefore, the ultrasonic-assisted method can be used to refine and customize the grains of the SLM-formed structure. According to the property and performance differences between the grain structures formed by SLM with and without ultrasonic action, learning from composite materials to optimize the combination of material components with different properties and maintain the performance advantages of each component, using ultrasonic waves to form specially customized refined sub-grains and grain structures, and realizing the multi-scale digital customization of grain, regional three-dimensional microstructure, and macroscopic crystal structure composite materials. Using different customized "crystal structure composite materials" for different regional grain structures, introducing the "fine-grained skeleton structure" into the material matrix formed by conventional SLM, and realizing the complementarity and correlation between the fine-grained structure and the matrix structure to obtain excellent comprehensive performance. Generally speaking, it is to use the ultrasonic-assisted SLM forming method to realize the digital customization of crystal structure composite materials.

[0044] As Figure 5 shown, this embodiment provides an SLM multi-scale digital organizational structure customization method based on ultrasonic compounding, which is used to digitally multi-scale compound ultrasonic grain refinement, three-dimensional structure, and composite structure materials. The method specifically includes the following steps:

[0045] S1. Obtain the part model to be processed, and design a three-dimensional fine-grained skeleton structure that conforms to the characteristics of the fine-grained structure according to the part model.

[0046] S2. Perform a Boolean operation on the three-dimensional fine-grained skeleton structure and the part model to obtain a formed matrix structure.

[0047] S3. Slice the formed matrix structure and the three-dimensional fine-grained skeleton structure obtained after Boolean operation according to their actual relative positions in the same three-axis coordinate to obtain two slice data sets.

[0048] S4. According to the two slice data sets, in-situ composite the formed matrix structure or part model obtained after Boolean operation with the three-dimensional fine-grained skeleton structure to complete the printing preparation.

[0049] S5. Control the ultrasonic composite SLM forming system to perform printing until the printing is completed.

[0050] Among them, the ultrasonic composite SLM forming system includes:

[0051] A laser for generating laser light;

[0052] A forming cylinder with a built-in forming platform for supporting the powder bed and placing the formed part structure;

[0053] A forming cavity, in which a powder spreading unit is provided for spreading metal powder onto the forming platform in the forming cylinder to form a powder bed;

[0054] An ultrasonic device for generating ultrasonic waves acting on the molten pool; among them, the opening or closing of the ultrasonic device is controlled according to the slice data of the three-dimensional fine-grained skeleton structure.

[0055] As an implementation method, referring to Figure 1 , the ultrasonic device is connected to the substrate for placing the workpiece to be processed, and the ultrasonic waves generated by the ultrasonic device are transmitted through the substrate and the part to the molten pool and act on it.

[0056] As another implementation method, referring to Figure 2 , the ultrasonic device is installed in the forming cavity, and the ultrasonic oscillator of the ultrasonic device has the functions of ultrasonic focusing and scanning movement. The generated ultrasonic waves are transmitted to the molten pool according to the slice data of the three-dimensional fine-grained skeleton structure at a preset focal length through a gas medium and act on it.

[0057] Both of the above two ultrasonic devices can adjust the ultrasonic amplitude through power adjustment and can adjust the ultrasonic frequency by replacing the oscillator.

[0058] Specifically, the opening or closing of the ultrasonic device is based on the slice data of the three-dimensional "fine-grained skeleton structure", that is, when the laser of the SLM forming system scans the slice trajectory of the "fine-grained skeleton structure", the ultrasonic waves are turned on and act. Figure 1 In the system, the ultrasonic oscillator can be turned on and act when the laser scans the slice trajectory of the "fine-grained skeleton structure" and turned off when the scanning is completed. Figure 2In it, for the "fine-grained skeleton structure" slice data, the ultrasonic focusing system and the laser scanning are simultaneously controlled so that the action foci of the two systems act on the same point. During the scanning process, the ultrasonic wave is simultaneously turned off or on following the laser switch signal.

[0059] Further as an optional implementation manner, the powder spreading unit includes a powder spreading guide rail, a powder spreading blade, a powder cylinder, and an air intake guide rail;

[0060] The powder cylinder is used to hold metal powder;

[0061] The powder spreading blade is used to scrape the metal powder from the powder cylinder and then drop the powder after reaching a preset position along the powder spreading guide rail;

[0062] The air intake guide rail is used to input protective gas.

[0063] As an optional implementation manner, the powder spreading blade scrapes the powder in the powder cylinder through the blade below it to the upper part of the forming cylinder and levels it. For each layer formed, the powder cylinder moves up one layer, the forming cylinder moves down one layer, and the powder spreading blade spreads the powder once, and this process is repeated in a cycle. As another optional implementation manner, the metal powder is placed in the powder cylinder, and the powder cylinder is arranged near the forming platform. The metal powder is sucked through a powder suction nozzle or other powder suction components, and through a moving platform, the sucked metal powder is transported above the forming platform for powder spreading. As another optional implementation manner, the metal powder is placed in a powder bottle, the powder bottle is arranged outside the forming cavity, the powder bottle is connected to a powder dropping nozzle through a pipeline, the powder dropping nozzle is arranged in the forming cavity, and the metal powder in the powder bottle is transported to the powder dropping nozzle through air pressure, and the powder dropping nozzle is moved to a preset position through a moving platform for powder spreading.

[0064] Further as an optional implementation manner, the laser selective melting system further includes a scanning galvanometer, and the laser generated by the laser generator is input into the scanning galvanometer; the scanning galvanometer is used to control the scanning movement of the laser so that the laser scans within a preset area in the powder bed.

[0065] In some embodiments, the emission angle of the laser can be controlled by the scanning galvanometer so that the laser irradiates different positions on the forming cylinder, thereby melting all the metal powder on the forming cylinder. In some other embodiments, a moving platform is installed on the forming cylinder, and by controlling the position movement of the moving platform, the laser irradiates different positions on the workpiece to be processed, so as to melt the metal powder at all positions.

[0066] There are mainly two three-dimensional "fine-grained skeleton structure" ultrasonic composite SLM customization methods, namely the remelting method and the forming method.

[0067] See Figure 3, in the remelting method, the part model and the sliced data of the three-dimensional "fine-grained skeleton structure" are directly imported into the printing control software. The printing sequence is set to scan and form the matrix structure first. Since there is an overlapping part between the part model and the three-dimensional "fine-grained skeleton structure", scanning the overall part area first and then the three-dimensional "fine-grained skeleton structure" will remelt the sliced area of the three-dimensional "fine-grained skeleton structure" on the formed overall part area. At this time, the ultrasonic wave is in the on state, and ultrasonic composite remelting realizes grain refinement in a specific area, achieving fine-grained customization of the three-dimensional "fine-grained skeleton structure".

[0068] See Figure 4 , in the forming method, after completing the structural design of the part model and the three-dimensional "fine-grained skeleton structure" model, a "subtraction" Boolean operation is performed on the two models to obtain a formed matrix structure with the three-dimensional "fine-grained skeleton structure" hollowed out (the formed matrix model minus the three-dimensional "fine-grained skeleton structure" model). At this time, the sliced hollowed matrix model and the three-dimensional "fine-grained skeleton structure" model are imported into the printing control software. At this time, there is no overlapping part between the formed matrix structure and the three-dimensional "fine-grained skeleton structure". The printing sequence is set to scan the hollowed formed matrix structure first. At this time, the hollowed formed matrix structure and the three-dimensional "fine-grained skeleton structure" will be formed successively. The ultrasonic wave is turned on when the laser scans the three-dimensional "fine-grained skeleton structure", realizing ultrasonic composite SLM forming and preparing the ultrasonic composite grain refinement structure while forming.

[0069] In summary, this application digitally composites ultrasonic grain refinement, three-dimensional structure, and composite structure materials at multiple scales: ① First, design the three-dimensional space structure model of the composite material, that is, design a three-dimensional "fine-grained skeleton structure" that conforms to the characteristics of the fine-grained structure according to the part model. This three-dimensional "fine-grained skeleton structure" can be arbitrarily digitally designed. ② Then perform a Boolean operation on the "fine-grained skeleton structure" and the original part model. ③ Then slice the overall part model and the three-dimensional "fine-grained skeleton structure" after the Boolean operation respectively in the same three-axis coordinate according to the actual relative position to obtain two sliced data. ④ At the same time, import the obtained sliced data into the printing control software respectively, and make the in-situ composite of the overall part model and the three-dimensional "fine-grained skeleton structure" model after the Boolean operation by setting the position coordinates of the sliced data center in the printing coordinate system. ⑤ After completing the printing preparation, turn on the ultrasonic composite SLM forming system to start printing until the printing is completed. This application uses ultrasonic waves to form specially customized refined sub-grains and grain structures, realizing multi-scale digital customization of grains, regional three-dimensional microstructures, and macroscopic crystal structure composite materials. Using different customized "crystal structure composite materials" for different regional grain structures, introducing the "fine-grained skeleton structure" into the material matrix of conventional SLM forming, realizing the complementarity and correlation between the fine-grained structure and the matrix structure, and obtaining excellent comprehensive performance.

[0070] In the foregoing description of this specification, the descriptions referring to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

[0072] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for customizing multi-scale digital tissue structures by SLM based on ultrasonic compounding, characterized in that, Including the following steps: Obtain the part model to be processed, and design a three-dimensional fine-grained skeleton structure that conforms to the characteristics of the fine-grained structure according to the part model; Perform a Boolean operation on the three-dimensional fine-grained skeleton structure and the part model to obtain a formed matrix structure; Slice the formed matrix structure and the three-dimensional fine-grained skeleton structure obtained after the Boolean operation respectively at their actual relative positions in the same three-axis coordinate to obtain two slice data; According to the two slice data, in-situ composite the formed matrix structure or the part model obtained after the Boolean operation and the three-dimensional fine-grained skeleton structure to complete the printing preparation; Control the ultrasonic composite SLM forming system to perform printing until the printing is completed.

2. The method for customizing a multi-scale digital organizational structure of SLM based on ultrasonic compounding according to claim 1, characterized in that The ultrasonic composite SLM forming system includes: A laser for generating laser; A forming cylinder with a forming platform inside, which is used to support the powder bed and place the formed part of the part structure; A forming cavity, in which a powder spreading unit is provided, and the powder spreading unit is used to spread metal powder onto the forming platform in the forming cylinder to form a powder bed; An ultrasonic device for generating ultrasonic waves acting on the molten pool; wherein, the opening or closing of the ultrasonic device is controlled according to the slice data of the three-dimensional fine-grained skeleton structure.

3. A method for customizing a multi-scale digital organizational structure of SLM based on ultrasonic compounding according to claim 2, characterized in that The ultrasonic device is connected to the substrate for placing the workpiece to be processed, and the ultrasonic waves generated by the ultrasonic device are transmitted through the substrate and the part to the molten pool and act thereon.

4. A method for customizing a multi-scale digital organizational structure of SLM based on ultrasonic compounding according to claim 2, characterized in that, The ultrasonic device is installed in the forming cavity, and the ultrasonic vibrator of the ultrasonic device has the functions of ultrasonic focusing and scanning movement. The generated ultrasonic waves are transmitted to the molten pool according to the slice data of the three-dimensional fine-grained skeleton structure at a preset focal length through a gas medium and act thereon.

5. A method for customizing a multi-scale digital organizational structure of SLM based on ultrasonic compounding according to claim 2, characterized in that The controlling the ultrasonic composite SLM forming system to perform printing includes: When the ultrasonic composite SLM forming system scans the slice trajectory of the three-dimensional fine-grained skeleton structure, turn on the ultrasonic device and act on the molten pool.

6. A method for customizing a multi-scale digital organizational structure by SLM based on ultrasonic compounding according to claim 1, characterized in that The in-situ composite of the formed matrix structure and the three-dimensional fine-grained skeleton structure according to the two slice data includes: Import the obtained slice data into a preset printing control software respectively, and by setting the position coordinates of the slice data center in the printing coordinate system, the formed matrix structure and the three-dimensional fine-grained skeleton structure are in-situ composite.

7. A method for customizing a multi-scale digital organizational structure of SLM based on ultrasonic compounding according to claim 2, characterized in that Adopt the remelting method to realize the ultrasonic composite SLM customization of the three-dimensional fine-grained skeleton structure: Import the slice data of the part model and the three-dimensional fine-grained skeleton structure into a preset printing control software at the same time. Since there is an overlapping part between the part model and the three-dimensional fine-grained skeleton structure, scanning the overall part area first and then the three-dimensional fine-grained skeleton structure will remelt the slice area of the three-dimensional fine-grained skeleton structure on the formed overall part area. At this time, the ultrasonic device is in the on state, and ultrasonic composite remelting realizes grain refinement in a specific area, realizing the fine-grain customization of the three-dimensional fine-grained skeleton structure.

8. A method for customizing a multi-scale digital organizational structure by SLM based on ultrasonic compounding according to claim 2, characterized in that Adopt the forming method to realize the ultrasonic composite SLM customization of the three-dimensional fine-grained skeleton structure: After completing the structural design of the part model and the three-dimensional fine-grained skeleton structure model, perform an exclusion Boolean operation on the two models to obtain a formed matrix structure with the three-dimensional fine-grained skeleton structure hollowed out; After slicing the formed matrix structure model and the three-dimensional fine-grained skeleton structure model with hollowing, they are imported into the preset printing control software. At this time, there is no overlapping part between the formed matrix structure and the three-dimensional fine-grained skeleton structure; Set the printing order to scan the formed matrix structure with hollowing first. At this time, the formed matrix structure with hollowing and the three-dimensional fine-grained skeleton structure will be formed successively. When the laser scans the three-dimensional fine-grained skeleton structure, the ultrasonic device is turned on to achieve ultrasonic composite SLM forming, and the preparation of the ultrasonic composite grain refinement structure is realized during the forming.

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