Non-contact conduction type weak ultrasound-assisted laser direct energy deposition device and method

Abstract

The invention discloses a non-contact conduction type weak ultrasound-assisted laser direct energy deposition device and method, and belongs to the technical field of additive manufacturing equipment. The invention discloses a non-contact conduction type weak ultrasound-assisted laser direct energy deposition device. The non-contact conduction type weak ultrasound-assisted laser direct energy deposition device comprises a powder feeding printing part, a printing platform and an ultrasonic vibration part. The printing end of the powder feeding printing part and a molten pool formed in the upper surface of the printing platform are oppositely arranged. The output end of the ultrasonic vibration part is arranged at a fixed distance from the molten pool; and the ultrasonic vibration part is fixedly connected with the powder feeding and printing part. According to the device disclosed by the invention, ultrasonic sound waves output by the ultrasonic vibration component in the printing process are attenuated from the emission head through air (protective gas) and enter a molten pool in a non-contact transmission mode, and negative effects such as over-strong cavitation bubbles are avoided while grain refinement and residual stress elimination are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing equipment, and specifically relates to a non-contact conduction weak ultrasound-assisted laser direct energy deposition device and method. Background Art

[0002] As an advanced digital forming technology, laser additive manufacturing technology has demonstrated significant advantages in the near-net-shape preparation of large and complex metal components in the aerospace field, such as titanium alloy casings and high-temperature alloy turbine blades. However, this technology is prone to forming coarse columnar crystal structures during the rapid melting process of high-energy lasers. The main reason is the epitaxial growth phenomenon caused by the extremely high temperature gradient and solidification rate ratio in the molten pool. This anisotropic microstructure will significantly reduce the mechanical properties of the parts. At the same time, the layer-by-layer forming method will introduce significant thermal cycling stress. Coupled with the non-equilibrium phase transformation stress generated during the rapid cooling process, residual stress of up to hundreds of MPa accumulates inside the formed part, which in severe cases can cause the part to warp, deform, or even crack.

[0003] However, existing ultrasonic-assisted laser additive manufacturing technologies generally use contact-based ultrasonic introduction, including typical process methods such as ultrasonic head-substrate contact, ultrasonic head contact pressure, and wire-guided methods. These contact-based ultrasonic introduction methods have significant technical limitations in practical applications. On the one hand, due to the direct contact coupling between the ultrasonic transducer and the substrate or material, the cavitation effect intensity is too high. Under the intense cavitation action, the molten metal in the molten pool is prone to microbubble defects, which seriously affect the density and mechanical properties of the formed part. On the other hand, the energy transfer efficiency of contact-based ultrasonic is significantly affected by the interfacial contact state. During long-term continuous processing, the stability of ultrasonic energy transfer to the molten pool decreases sharply due to factors such as increasing substrate temperature, surface oxidation, or mechanical vibration, causing the ultrasonic effect intensity to fluctuate with the extension of processing time. This unstable energy input leads to significant differences in grain refinement effects in different regions of large-scale parts, making it difficult to meet the strict requirements for material microstructure uniformity in engineering applications. Research published in 2016 in the journal Acta Materialia by Tao Yuan et al. shows that while ultrasonic stirring within the melt pool can effectively refine grains, excessive cavitation can destabilize the melt pool, further demonstrating the inherent limitations of contact ultrasonic processing. These issues severely restrict the engineering application of ultrasonic-assisted laser additive manufacturing (UALAM) in the manufacture of large, critical, load-bearing aerospace components. There is an urgent need to develop novel non-contact ultrasonic induction methods to achieve stable and controllable melt pool ultrasonic processing.

[0004] Therefore, there is an urgent need to develop an ultrasonic-assisted laser additive manufacturing process method and device with small bubble side effects and stable energy. Summary of the Invention

[0005] The purpose of the present invention is to provide a non-contact conduction weak ultrasound assisted laser direct energy deposition device and method, which is used to solve the technical problems that the existing laser deposition equipment using contact ultrasound process is prone to cause large bubble side effects and unstable energy. In order to achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a non-contact conduction type weak ultrasound assisted laser direct energy deposition device, comprising: a powder feeding printing component, a printing platform and an ultrasonic vibration component. The printing end of the powder feeding printing component and a molten pool formed on the upper surface of the printing platform are arranged relative to each other; the output end of the ultrasonic vibration component is arranged to maintain a fixed distance from the molten pool; and the ultrasonic vibration component is fixedly connected to the powder feeding printing component.

[0006] Furthermore, the powder feeding and printing component includes a laser printing head, the output end of the laser printing head is connected to a coaxial powder feeding head; the printing end of the coaxial powder feeding head is arranged opposite to the molten pool formed on the upper surface of the printing platform; The ultrasonic vibration component is fixedly connected to the powder feeding printing component through a connecting bracket.

[0007] Furthermore, the coaxial powder feeding head is also connected to a powder conveying system.

[0008] Furthermore, the ultrasonic vibration component includes an ultrasonic vibrator, an ultrasonic controller and an ultrasonic transmitter; the ultrasonic controller is connected to one end of the ultrasonic vibrator; the other end of the ultrasonic vibrator is connected to the ultrasonic transmitter, and the output end of the ultrasonic transmitter is set at a fixed distance from the molten pool.

[0009] Furthermore, the output end of the ultrasonic transmitter is also connected to an ultrasonic amplifier.

[0010] Furthermore, it also includes a cooling component; the cooling component is connected to the ultrasonic vibration component.

[0011] Furthermore, the cooling component includes a cooling water circulation pipe, a water tank and a cooling copper pipe; the outlet of the water tank is connected to one end of the cooling water circulation pipe; the cooling copper pipe is wound and arranged inside the ultrasonic vibrator; the other end of the cooling water circulation pipe is connected to the cooling copper pipe inside the ultrasonic vibrator.

[0012] The present invention also discloses a method for printing using the non-contact conduction type weak ultrasound assisted laser direct energy deposition device, comprising the following steps: First, the powder feeding printing component is turned on, and then printing is carried out on the printing platform according to the powder delivery amount and laser parameters set by the manufacturing parameters. During the printing process, the ultrasonic wave is output by the ultrasonic vibration component, attenuated by the air or protective gas, and then melts the pool in a non-contact manner. After completing the printing steps, a three-dimensional part is obtained.

[0013] Furthermore, the printing method is layer-by-layer stacking printing.

[0014] Furthermore, the cooling component and the ultrasonic vibration component are turned on at the same time.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a non-contact conduction type weak ultrasound assisted laser direct energy deposition device. By arranging an ultrasonic vibration component and keeping a fixed distance between the ultrasonic vibration component and the molten pool, the ultrasonic sound waves output by the ultrasonic vibration component during the printing process are attenuated from the transmitting head through the air (protective gas) and enter the molten pool by a non-contact transmission method. While achieving grain refinement and eliminating residual stress, negative effects such as excessive cavitation bubbles are avoided, thus solving the technical problems of existing laser deposition equipment using contact ultrasonic technology that easily cause large bubble side effects and unstable energy.

[0016] Furthermore, by providing a cooling component, heat accumulation of the ultrasonic generator is eliminated, and the cooling copper tube is wrapped around the heating part, and heat accumulation is eliminated through water cooling, thereby increasing the service life of the vibration part and facilitating practical engineering applications.

[0017] Furthermore, the powder feeding and printing components move synchronously with the ultrasonic vibrator, and the ultrasonic vibrator and laser print head move synchronously. The relative distance from the molten pool remains constant during printing, thus maintaining a stable ultrasonic energy within the molten pool. This ensures the stability and uniformity of the ultrasonic action.

[0018] Furthermore, the setting of the ultrasonic amplifier concentrates the energy scattered by the ultrasonic transmitter, and the ultrasonic intensity can be accurately adjusted as needed.

[0019] Furthermore, the device of the present invention has strong operability and applicability. In actual use, different laser and ultrasonic process matching parameters can be selected according to the specific forming requirements of different metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the non-contact conduction weak ultrasound-assisted laser direct energy deposition device of the present invention; Figure 2 This is a schematic structural diagram of the powder feeding and printing component of the present invention; Figure 3Schematic diagram of the structure of the ultrasonic vibration component of the present invention; Figure 4 It is a schematic structural diagram of the cooling component of the present invention; Among them: 1-powder feeding printing component; 2-laser printing head; 3-coaxial powder feeding head; 4-printing platform; 5-molten pool; 6-ultrasonic vibration component; 7-ultrasonic amplifier; 8-ultrasonic transmitting head; 9-ultrasonic vibrator; 10-ultrasonic controller; 11-connecting bracket; 12-cooling component; 13-cooling water circulation pipe; 14-water tank; 15-cooling copper pipe. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The present invention is described in further detail below with reference to the accompanying drawings: See also Figures 1 to 4As shown, the present invention discloses a non-contact conduction weak ultrasound-assisted laser direct energy deposition device, comprising: a powder feeding printing component 1, used to feed powder material to a printing platform 4 and perform laser melting and deposition layer by layer according to a preset trajectory to obtain a final three-dimensional part; an ultrasonic vibration component 6, connected to the powder feeding printing component through a connecting bracket 11, and moving synchronously with the powder feeding printing component 1 during the printing process, while maintaining a fixed distance from the molten pool 5, wherein the ultrasonic transmitter 8 is not in direct contact with the molten pool 5 or the substrate, and the sound wave is attenuated by air (protective gas) and then transmitted into the molten pool 5, thereby interfering with the solidification behavior of the molten pool 5; a cooling component 12, used to cool the ultrasonic vibrator 9, accumulate heat during the printing process, so that it can be suitable for longer printing, prepare the equipment and ensure that the laser, ultrasound and metal powder converge at the same focus (molten pool 5) of the substrate, and adjust the ultrasonic amplifier 7 and the ultrasonic controller 10 so that the energy intensity of the sound wave entering the molten pool 5 meets the experimental requirements.

[0024] Preferably, the powder feeding and printing component 1 includes: a laser printing head 2, which is used to melt and deposit the powder material laid layer by layer according to a preset trajectory to obtain a three-dimensional part; a coaxial powder feeding head 3, which is installed at the output end of the laser printing head 2 and is connected to the powder conveying system of the additive manufacturing equipment, and is used to convey the powder material into the forming chamber according to the powder conveying amount set by the manufacturing parameters; a printing platform 4, which is used to carry the printed part.

[0025] Preferably, the ultrasonic vibration component 6 controls the ultrasonic output intensity of the ultrasonic vibrator 9 through the ultrasonic controller 10; the ultrasonic transmitter head 8 has no direct contact with the molten pool 5 or the substrate, and the sound waves are emitted by the ultrasonic transmitter head 8, attenuated by the air (protective gas) and transmitted to the molten pool 5 non-contactly, which can refine the grains and eliminate residual stress while avoiding negative effects such as cavitation pores; at the same time, the ultrasonic transmitter head 8 can be installed with an ultrasonic amplifier 7 to concentrate the energy scattered by the ultrasonic transmitter head 8, and the ultrasonic intensity can be accurately controlled as needed; the ultrasonic vibrator 9 is connected to the powder feeding printing component 1 through the connecting bracket 11, and the ultrasonic transmitter head 8 moves synchronously with the laser printing head 2, maintaining a fixed distance from the molten pool 5, ensuring the stability of the ultrasonic energy of the molten pool 5, and is suitable for the manufacture of large-size parts.

[0026] Preferably, the cooling component 12 includes: a cooling copper tube 15, which is used to eliminate heat accumulation in the vibration part during printing to achieve a stable ultrasonic effect during long-term operation. The cooling copper tube 15 is wrapped around the ultrasonic vibrator 9 in multiple layers to increase the heat dissipation area, and the gap between the copper tube and the vibration part is filled with thermal conductive glue to further increase the heat dissipation area; a cooling water circulation pipe 13, which is used to circulate cooling water between the heating part and the water tank 14 to ensure the cooling effect; the water tank 14 is used to treat the cooling water and cool the cooling water after use.

[0027] Preferably, high-purity argon is selected as the powder carrier gas and the shielding gas to prevent oxidation and inclusion contamination of the alloy during the forming process.

[0028] The present invention also discloses a method for printing using the aforementioned non-contact, weak ultrasound-assisted laser direct energy deposition device, including: forming a molten pool 5 based on a powder delivery rate and laser parameters set by manufacturing parameters, and printing a three-dimensional part layer by layer along a preset trajectory; during the printing process, ultrasonic waves are attenuated by air (shielding gas) and then non-contactly transmitted into the molten pool 5, weakening cavitation bubbles. This method refines grains and eliminates residual stress while avoiding negative effects such as cavitation pores. Furthermore, an ultrasonic vibrator 9 is connected to the powder feeding and printing component 1, and an ultrasonic transmitter 8 moves synchronously with the laser print head 2, maintaining a fixed distance from the molten pool 5. This ensures the stability of the ultrasonic energy in the molten pool 5, making it suitable for the manufacture of large-scale parts.

[0029] This invention utilizes non-contact ultrasonic loading. The ultrasonic waves are attenuated by air (shielding gas) and enter the molten pool 5 for non-contact interference. This weakened energy prevents defects such as pores caused by cavitation. Furthermore, the synchronized movement of the ultrasonic transmitter 8 and the powder feeding and printing component 1 ensures stable ultrasonic energy within the molten pool 5, making it suitable for the manufacture of large parts. Variations in ultrasonic energy field parameters (magnitude, frequency, intensity, angle of incidence, etc.), the type and parameters of the laser heat source, the movement of the print head, the shape and movement of the forming substrate / printing platform, the type of metal material (titanium, aluminum, steel, nickel, etc.), and the delivery method (powdered, filamentous, etc.) are all within the scope of the present invention.

[0030] The present invention provides a non-contact conduction weak ultrasound-assisted laser direct energy deposition device and method. Through an innovative non-contact ultrasonic introduction method, it effectively solves the key problems existing in traditional contact-type ultrasonic-assisted laser additive manufacturing processes. The device mainly consists of a powder feeding printing component 1, a printing platform 4, and an ultrasonic vibration component 6, wherein the output end of the ultrasonic vibration component 6 is set at a fixed distance from the molten pool 5, and ultrasonic energy is transmitted through air or a protective gas medium. This non-contact design avoids the problems of molten pool disturbance and bubble defects caused by excessive cavitation energy in traditional contact methods (such as the molten pool splashing easily generated by ultrasonic head-substrate contact), while ensuring the stability of ultrasonic energy transmission and overcoming the energy fluctuation problem caused by changes in interface state in contact processes.

[0031] The core innovations of this device are reflected in many aspects: First, the ultrasonic vibration component 6 is fixedly connected to the powder feeding and printing component 1 through the connecting bracket 11, so that the ultrasonic transmitter head 8 maintains coordinated movement with the laser printing head 2 and the coaxial powder feeding head 3, which ensures that the ultrasonic action is always aimed at the molten pool 5 without interfering with the laser optical path and powder transportation. Secondly, the ultrasonic vibration component 6 adopts a modular design, including an ultrasonic vibrator 9, an ultrasonic controller 10 and an ultrasonic transmitter head 8, and can be optionally equipped with an ultrasonic amplifier 7 to accurately adjust the ultrasonic energy density and achieve precise control of the weak ultrasonic field. Furthermore, the innovative cooling component 12 forms a closed-loop cooling circuit through the cooling water circulation pipe 13, the water tank 14 and the cooling copper tube 15 wrapped around the inside of the ultrasonic vibrator 9, ensuring that the ultrasonic device can work stably for a long time.

[0032] The printing method of the device includes: after turning on the powder feeding printing component 1, performing layer-by-layer stacking printing according to the set powder feeding amount and laser parameters, while the ultrasonic vibration component (6) outputs a weak ultrasonic field attenuated by air to act on the molten pool 5, and the cooling component 12 operates throughout the process to ensure the stability of the equipment. Compared with traditional processes, this technical solution has significant advantages: the grain refinement effect is more uniform. These performance improvements are mainly due to the precise control of the non-contact weak ultrasonic field on the solidification process of the molten pool, which not only promotes heterogeneous nucleation and equiaxed crystal formation, but also avoids the negative impact of excessive cavitation effect.

[0033] The technical solution of the present invention is particularly suitable for the precision forming of large and complex metal components in the field of aerospace, such as the manufacture of key components such as titanium alloy casings and high-temperature alloy turbine blades. Through the organic combination of non-contact ultrasonic introduction, stable energy control, collaborative motion design and efficient cooling system, the device achieves high uniformity, low defect, high-performance metal additive manufacturing, solves the key bottleneck problem of traditional contact ultrasonic process in engineering applications, and has important industrial application value and broad market prospects. Experimental data show that the parts formed by this technology not only have significantly improved microstructure, but also have greatly improved mechanical properties and dimensional stability, which fully meets the stringent requirements of high-end equipment such as aircraft engines for key components.

[0034] Example 1 Taking titanium alloy powder as an example, the powder conveying system of the additive manufacturing equipment conveys the powder material to the coaxial powder feeding head 3 according to the powder conveying amount set by the manufacturing parameters, and the coaxial powder feeding head 3 conveys the powder material to the printing platform 4 according to the set feeding trajectory; The laser print head 2 melts and scans the powder material laid layer by layer along a set trajectory to form a molten pool 5. At the same time, the ultrasonic controller 10 is activated, and the ultrasonic vibrator 9 begins to operate. The ultrasonic wave enters the molten pool 5 after being attenuated by the air (shielding gas), providing vibration interference of a preset frequency and direction to the molten pool 5, thereby achieving grain refinement and eliminating residual stress in the molten pool 5. After one layer of scanning is completed, the powder feeding printing component 1 and the ultrasonic vibration component 6 move synchronously and move up one layer (or the printing platform / substrate moves down one layer), and the above scanning and vibration process is repeated; The water tank 14 and the ultrasonic device are turned on at the same time, and cooling water flows in the cooling copper tube 15 to eliminate the heat accumulation of the vibrating part, and so on, until the final three-dimensional object is obtained; After completion, turn off the energy beam, vibration, powder delivery, water cooling and protective gas in sequence.

[0035] The non-contact, conductive, weak ultrasound-assisted laser direct energy deposition device proposed in this invention offers significant advantages over traditional contact ultrasound-assisted methods. Traditional contact ultrasound (e.g., ultrasound head contact-pressure substrate or wire-guided methods) directly transmits high-intensity vibrations to the molten pool 5, which can easily lead to excessive cavitation, causing problems such as spatter and blister defects. In contrast, the present invention maintains an ultrasonic transmitter 8 at a fixed distance from the molten pool 5. The ultrasonic energy, attenuated by air or a protective gas medium, acts indirectly on the molten pool 5, forming a controllable weak ultrasonic field. This field promotes grain refinement without destabilizing the molten pool 5 and preventing defects such as pores.

[0036] Energy transfer in conventional contact ultrasound is affected by the mechanical coupling state, making thermal deformation or vibration of the substrate susceptible to unstable energy input, thus affecting tissue uniformity. The present invention precisely adjusts ultrasonic parameters through an ultrasonic controller 10 and optionally uses an ultrasonic amplifier 7 to optimize energy density, ensuring stable ultrasonic action throughout the entire forming process. This makes it particularly suitable for the uniform manufacturing of large aerospace components.

[0037] Conventional contact ultrasonic devices can interfere with the laser optical path or powder flow field. The present invention securely connects the ultrasonic vibrating component 6 to the powder feeding and printing component 1 via a connecting bracket 11. This allows the ultrasonic transmitter 8 to maintain coordinated movement with the laser printing head 2 and coaxial powder feeding head 3, ensuring that the ultrasonic action is always focused on the molten pool 5 without affecting laser focusing and powder delivery, thereby improving process compatibility.

[0038] Ultrasonic vibrators 9 are prone to overheating and energy attenuation during prolonged operation. The present invention utilizes a cooling component 12, consisting of a water tank 14, a cooling water circulation pipe 13, and a cooling copper tube 15 wrapped around the vibrator. This effectively controls the temperature of the ultrasonic device, ensuring stable ultrasonic energy output and suitable for industrial-grade, long-term, continuous manufacturing.

[0039] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A non-contact conduction weak ultrasound assisted laser direct energy deposition device, characterized in that: include: The powder feeding printing component (1), the printing platform (4) and the ultrasonic vibration component (6) are arranged relative to each other, wherein the printing end of the powder feeding printing component (1) and the molten pool (5) formed on the upper surface of the printing platform (4) are arranged; the output end of the ultrasonic vibration component (6) is arranged to maintain a fixed distance from the molten pool (5); and the ultrasonic vibration component (6) is fixedly connected to the powder feeding printing component (1).

2. The non-contact conduction weak ultrasound-assisted laser direct energy deposition device according to claim 1, characterized in that: The powder feeding printing component (1) comprises a laser printing head (2), the output end of the laser printing head (2) being connected to a coaxial powder feeding head (3); the printing end of the coaxial powder feeding head (3) and a molten pool (5) formed on the upper surface of the printing platform (4) are arranged relative to each other; The ultrasonic vibration component (6) is fixedly connected to the powder feeding printing component (1) via a connecting bracket (11).

3. The non-contact conduction weak ultrasound-assisted laser direct energy deposition device according to claim 2, characterized in that: The coaxial powder feeding head (3) is also connected to a powder conveying system.

4. The non-contact conduction weak ultrasound-assisted laser direct energy deposition device according to claim 1, characterized in that: The ultrasonic vibration component (6) includes an ultrasonic vibrator (9), an ultrasonic controller (10) and an ultrasonic transmitter (8); the ultrasonic controller (10) is connected to one end of the ultrasonic vibrator (9); the other end of the ultrasonic vibrator (9) is connected to the ultrasonic transmitter (8), and the output end of the ultrasonic transmitter (8) is arranged to maintain a fixed distance from the molten pool (5).

5. The non-contact conduction weak ultrasound-assisted laser direct energy deposition device according to claim 4, characterized in that: The output end of the ultrasonic transmitter (8) is also connected to an ultrasonic amplifier (7).

6. The non-contact conduction weak ultrasound-assisted laser direct energy deposition device according to claim 4, characterized in that: It also includes a cooling component (12); the cooling component (12) is connected to the ultrasonic vibration component (6).

7. The non-contact conduction weak ultrasound assisted laser direct energy deposition device according to claim 6, characterized in that: The cooling component (12) includes a cooling water circulation pipe (13), a water tank (14) and a cooling copper pipe (15); the outlet of the water tank (14) is connected to one end of the cooling water circulation pipe (13); the cooling copper pipe (15) is wound and arranged inside the ultrasonic vibrator (9); the other end of the cooling water circulation pipe (13) is connected to the cooling copper pipe (15) inside the ultrasonic vibrator (9).

8. A method for printing using a non-contact conduction weak ultrasound-assisted laser direct energy deposition device according to any one of claims 1 to 7, characterized in that: The following steps are involved: First, the powder feeding printing component (1) is turned on, and then printing is performed on the printing platform (4) according to the powder feeding amount and laser parameters set by the manufacturing parameters. During the printing process, the ultrasonic wave is output by the ultrasonic vibration component (6), attenuated by air or protective gas, and then melts the pool (5) in a non-contact manner. After the printing steps are completed, a three-dimensional part is obtained.

9. The method for printing using a non-contact conduction weak ultrasound-assisted laser direct energy deposition device according to claim 8, characterized in that: The printing method is layer-by-layer stacking printing.

10. The method for printing using a non-contact conduction weak ultrasound-assisted laser direct energy deposition device according to claim 8, characterized in that: The cooling component (12) and the ultrasonic vibration component (6) are turned on simultaneously.

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