An ultrasonic regulation-based directional additive manufacturing method and a metallic bulk

Abstract

The present invention relates to the field of additive manufacturing technology, and specifically relates to a directional additive forming method based on ultrasonic regulation, comprising the following steps: filling metal powder into a mold, pressing the metal powder in the mold by using a pressing module, arranging a plurality of first ultrasonic vibrators on the pressing module, and enabling each first ultrasonic vibrator to contact the metal powder in the mold; setting the working parameters of each first ultrasonic vibrator according to the properties of the metal powder, and the working parameters include the ultrasonic start time, the ultrasonic end time, the ultrasonic power, the ultrasonic amplitude, and the ultrasonic frequency; maintaining the pressing pressure of the pressing module, starting each first ultrasonic vibrator to heat the metal powder according to the set working parameters, so that the metal powder in the mold is directionally formed in a set order to obtain a metal block.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and particularly relates to a directional additive manufacturing method based on ultrasonic regulation and a metal block Background Art

[0002] Aluminum alloys, titanium alloys, and amorphous alloys are all materials used to produce parts with specific properties and shapes through die-casting processes.

[0003] Due to its good fluidity and castability, aluminum alloy is very suitable for forming parts with complex shapes. However, pores and shrinkage porosity defects will occur during the die-casting process of aluminum alloy, which will affect its mechanical properties and surface quality. In addition, aluminum alloy has a high tendency of hot cracking and requires higher requirements for molds.

[0004] Titanium alloy is widely used in the fields of aerospace, medical, and chemical industries due to its excellent specific strength, high temperature resistance, and corrosion resistance. Die-casting of titanium alloy can bring good mechanical properties and corrosion resistance, but it has a high melting point and strong chemical activity, which makes the die-casting process difficult. At high temperatures, titanium alloy is prone to react with mold materials, resulting in mold loss and surface defects of formed parts.

[0005] Amorphous alloys (metallic glasses) have attracted attention due to their high strength, high hardness, and excellent elasticity. For amorphous materials, the difficulty lies in efficient heating and cooling to achieve the amorphous state of the material. Although die-casting of amorphous alloys can produce parts with complex shapes, the current die-casting method mainly heats the entire mold. This heating method has a slow heating rate and the amorphous alloy located at the internal position cannot be cooled in time, resulting in easy crystallization problems of the obtained amorphous alloy and affecting the performance of the amorphous alloy. Summary of the Invention

[0006] The purpose of the present invention is to avoid the deficiencies in the prior art and provide a directional additive manufacturing method based on ultrasonic regulation. This method can effectively control the heating rate and heating position during the die-casting process, enabling metal powder to form grains and cool in time, and improving the quality of metal powder forming.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] Provide a directional additive manufacturing method based on ultrasonic regulation, including the following steps:

[0009] Fill metal powder into a mold, use a pressurizing module to press the metal powder in the mold, and set a number of first ultrasonic vibrators on the pressurizing module to make each first ultrasonic vibrator contact the metal powder in the mold;

[0010] Set the working parameters of each first ultrasonic oscillator according to the properties of the metal powder, and the working parameters include the ultrasonic start time, the ultrasonic end time, the ultrasonic power, the ultrasonic amplitude, and the ultrasonic frequency;

[0011] Maintain the pressing pressure of the pressing module, start each first ultrasonic oscillator to heat the metal powder according to the set working parameters, so that the metal powder in the mold is directionally formed in a set order to obtain a metal block.

[0012] In some embodiments, when forming a bulk amorphous alloy, divide the metal powder area into an inner area, a middle area, and an outer area arranged in sequence from the inside outwards, and control the heating stage of the metal powder by controlling the first ultrasonic oscillator, including:

[0013] The first stage: control the heating temperature to decrease sequentially from the inner area to the outside;

[0014] The second stage: control the heating temperature to decrease from the inner area to the middle area and from the middle area to the outer area, wherein the heating temperature of the outer area is higher than that of the inner area;

[0015] The third stage: control the heating temperature to increase from the inner area to the outer area;

[0016] Among them, the highest heating temperature of each area is the same.

[0017] In some embodiments, the several first ultrasonic oscillators are distributed in a matrix on the pressing module.

[0018] In some embodiments, a second ultrasonic oscillator is provided at the bottom of the mold, and before pressing the pressing module, start the second ultrasonic oscillator to eliminate the gaps between the metal powders.

[0019] In some embodiments, place the mold in a temperature control module. When heating the metal powder, make the temperature control module heat up to heat the mold. When cooling the metal block, make the temperature control module cool down to cool the mold.

[0020] The heating range of the temperature control module is 100 - 800 °C, and the cooling range is -75 - 0 °C.

[0021] In some embodiments, the working time of each stage of the first ultrasonic oscillator is 40 - 80 s.

[0022] In some embodiments, place the mold in an atmosphere protection environment, and the atmosphere includes nitrogen, argon or carbon dioxide.

[0023] In some embodiments, the ultrasonic power of the first ultrasonic oscillator is 100W - 2000W, the ultrasonic amplitude is 1μm - 50μm, and the ultrasonic frequency is 17kHz - 28kHz.

[0024] In some embodiments, the pressure range of the pressurizing module is 1MPa - 500MPa.

[0025] Advantages of the method for directional additive manufacturing based on ultrasonic regulation of the present invention:

[0026] In the method for directional additive manufacturing based on ultrasonic regulation of the present invention, when die-casting metal powder, a plurality of first ultrasonic oscillators are arranged on the surface of the metal powder. On the one hand, the first ultrasonic oscillator can induce rapid heating of the metal powder particles by friction, achieve rapid melting of the material, and is conducive to the production of crystal grains of the metal material. On the other hand, by regulating the working sequence and vibration parameters of the first ultrasonic oscillator, the different heating temperatures of the metal powder in the entire mold can be quickly and accurately controlled, realizing gradient melting-solidification of the amorphous alloy in the mold from the inside to the outside, thereby ensuring the formation process of the amorphous state, overcoming the problems of inconsistent cooling due to uneven heat dissipation speed in the mold and low cooling efficiency, and effectively improving the quality of die-casting of metal powder in the mold.

[0027] (1) In the method for directional additive manufacturing based on ultrasonic regulation of the present invention, by regulating the first ultrasonic oscillator, the forming sequence of the metal powder in the mold can be effectively controlled, the metal powder can be welded layer by layer, the quality of die-casting metal powder in the mold can be improved, and the problems of simultaneous heating in the mold and inconsistent cooling speeds after the heat source is simultaneously disconnected, resulting in crystallization, can also be avoided.

[0028] A metal block is also provided, which is obtained by the above method for directional additive manufacturing based on ultrasonic regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the working state diagram of the first ultrasonic oscillator before and during ultrasonic heating in Example 1.

[0030] Figure 2 It is the top view of the arrangement of the first ultrasonic oscillator in Example 1.

[0031] Figure 3 It is the working state diagram of each stage of the first ultrasonic oscillator in Test Example 3.

[0032] Figure 4 It is the working state diagram of the temperature control module and the mold in Example 1.

[0033] Figure 5 It is the formed zirconium-based amorphous alloy block in Test Example 3.

[0034] Figure 6It is the XRD pattern of the zirconium-based amorphous alloy block in Test Example 3.

[0035] Figure 7 It is the hardness comparison diagram of the zirconium-based amorphous alloy block obtained by ultrasonic die-casting in Test Example 3 and the zirconium-based amorphous alloy block obtained by die-casting in Comparative Example 1.

[0036] Figure 8 It is the porosity comparison diagram of the zirconium-based amorphous alloy block obtained by ultrasonic die-casting in Test Example 3 and the zirconium-based amorphous alloy block obtained by die-casting in Comparative Example 1. Detailed implementation manners

[0037] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0038] The terms used in the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a", "the" used in the present invention and the appended claims are intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0039] It should be understood that although the terms "first", "second", "third", etc. may be used in the present invention to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plural" means two or more unless otherwise specifically defined.

[0040] Example 1

[0041] The method for directional additive manufacturing based on ultrasonic regulation disclosed in this embodiment, as Figures 1 - 2 , Figure 4 shown, includes the following steps:

[0042] Fill metal powder into a mold, use a pressurizing module to press the metal powder in the mold, and set a number of first ultrasonic vibrators on the pressurizing module to make each first ultrasonic vibrator contact the metal powder in the mold;

[0043] Specifically, the pressing module compacts the metal powder in the mold to form a shape. When the first ultrasonic oscillator is set on the pressing module, the first ultrasonic oscillator can vibrate and heat-melt the metal powder when compacting the metal powder.

[0044] Set the working parameters of each first ultrasonic oscillator according to the properties of the metal powder. The working parameters include the ultrasonic start time, ultrasonic end time, ultrasonic power, ultrasonic amplitude, and ultrasonic frequency.

[0045] Specifically, since the properties of different metal powders are different, in order to form a target metal block, the working parameters of the first ultrasonic oscillator must be set according to the characteristics of the metal powder. For example, when preparing a titanium alloy block or a stainless steel block, by controlling the start order of the first ultrasonic oscillator from left to right or from top to bottom, the growth of each layer of the metal layer can be regulated. For example, the regulation of the growth of those grains.

[0046] Another example is for amorphous alloys. To ensure that the middle position cools at a certain speed during molding. If heated and disconnected simultaneously, the cooling rate at the middle position will be lower than that at the edge, resulting in crystallization, which affects the performance of the amorphous alloy block. That is, the middle position is heated first, then it cools rapidly, and then the metal powder at the edge part is heated slowly and then cooled rapidly.

[0047] That is, during the implementation process, for different metal powders, such as titanium alloys or amorphous alloys, specific strategies are needed to control the start order of the ultrasonic oscillator and the heating and cooling process to ensure the growth of each layer of the metal layer and the cooling rate at the middle position, avoid the generation of crystallization, and thus ensure the performance of the amorphous alloy block.

[0048] This ultrasonic-controlled directional additive manufacturing method can produce metal parts with high precision and complex shapes by precisely controlling the working parameters of the ultrasonic oscillator, and is particularly suitable for the manufacture of metal blocks with high performance requirements.

[0049] Maintain the pressing pressure of the pressing module, start each first ultrasonic oscillator to heat the metal powder according to the set working parameters, so that the metal powder in the mold is directionally formed in a set order to obtain a metal block.

[0050] Specifically, after starting the first ultrasonic oscillator, a metal block can be formed in a set direction.

[0051] Ultrasonic welding converts high-frequency electrical energy into high-frequency mechanical vibration energy through an ultrasonic generator and transmits it to the welding head (i.e., the welding tool). The welding head transmits the high-frequency ultrasonic vibration energy of the first ultrasonic oscillator to the metal powder, causing the metal powder to generate high-frequency frictional heat, so as to quickly soften or melt and achieve material connection.

[0052] Combine ultrasonic vibration with die-casting molding. Use ultrasound to provide the main heat source during the die-casting process of materials. Achieve the constraint of stress during die-casting through the mold. Achieve the melting of powder materials by applying pressure through the ultrasonic vibration indenter. And achieve the control of the ambient temperature through the environmental control system around the mold. Finally, obtain the ultrasonic compression molding material.

[0053] As Figure 2 shown, the several first ultrasonic vibrators are distributed in a matrix on the pressurizing module. The first ultrasonic vibrators distributed in a matrix can be evenly distributed on the surface of the compacted metal powder.

[0054] A second ultrasonic vibrator is arranged at the bottom of the mold. Before pressing the pressurizing module, start the second ultrasonic vibrator to eliminate the voids between the metal powders and improve the quality of the metal block. The ultrasonic power range of the second ultrasonic vibrator is 100 - 2000W, the ultrasonic amplitude is 1 - 50μm, and the ultrasonic frequency is 17 - 28kHz.

[0055] As Figure 4 shown, place the mold in the temperature control module. When heating the metal powder, make the temperature control module rise in temperature to heat the mold. When cooling the metal block, make the temperature control module drop in temperature to cool the mold. The temperature rise range of the temperature control module is 100°C - 800°C, and the temperature drop range is -75 - 0°C.

[0056] Specifically, by adding a temperature control module, it can assist in heating the mold to melt the metal powder, and the temperature control module can also cool the mold to cool the metal powder.

[0057] Place the mold in an atmosphere protection environment. The atmosphere includes nitrogen, argon or carbon dioxide. Conduct atmosphere protection for the die-casting environment, or place the die-casting system in a vacuum device, and use a pressurizing module with ultrasonic vibration to apply pressure. Conduct atmosphere protection using inert gases such as nitrogen / argon / carbon dioxide, or place the system inside a large vacuum chamber.

[0058] The ultrasonic power of the first ultrasonic vibrator is 100W - 2000W, the ultrasonic amplitude is 1μm - 50μm, and the ultrasonic frequency is 17kHz - 28kHz.

[0059] The pressure range of the pressurizing module is 1MPa - 500MPa.

[0060] After obtaining the metal block, unload the pressure at a unloading speed of 1 - 50MPa / min, and take out the die-casting part.

[0061] Example 2

[0062] To further illustrate how to synthesize the metal block, this example discloses the following content:

[0063] When forming bulk amorphous alloys, the metal powder area is divided into an inner area, a middle area, and an outer area arranged in sequence from the inside outwards. The heating stage of the metal powder is controlled by regulating the first ultrasonic oscillator, including: as Figure 3 shown,

[0064] The first stage: Regulate the heating temperature to decrease sequentially from the inner area outwards;

[0065] Specifically, make the vibration frequency of the first ultrasonic oscillator located in the inner area higher than that in the middle area, and the vibration frequency of the first ultrasonic oscillator located in the middle area higher than that in the outer area. At this time, the metal powder located in the inner area first melts, followed by the middle area, and finally the outer area.

[0066] The second stage: Regulate the heating temperature to increase from the inner area to the middle area, and decrease from the middle area to the outer area. Among them, the heating temperature in the outer area is higher than that in the inner area;

[0067] Specifically, make the vibration frequency of the first ultrasonic oscillator located in the inner area lower than that in the middle area, and the vibration frequency of the first ultrasonic oscillator located in the middle area higher than that in the outer area. At this time, the molten metal powder located in the inner area is solidified and cooled in advance, followed by the metal powder in the middle area melting prior to the metal powder in the outer area, and finally the metal powder in the outer area melts.

[0068] The third stage: Regulate the heating temperature to increase from the inner area to the outer area;

[0069] Specifically, make the vibration frequency of the first ultrasonic oscillator located in the inner area lower than that in the middle area, and the vibration frequency of the first ultrasonic oscillator located in the middle area also lower than that in the outer area. At this time, the outermost metal powder melts, while the inner metal powder is cooled, avoiding the problem that the untimely cooling of the inner layer metal affects the quality.

[0070] Among them, the maximum heating temperature of each area is the same, so as to keep the grains of each area the same finally.

[0071] The working time of each stage of the first ultrasonic oscillator is 40 - 80 s. For example, the heating times of the first stage, the second stage, and the third stage are all 1 min.

[0072] Test Example 1

[0073] aluminum alloy

[0074] Apply a mold release agent inside the mold. After adding ADC10 aluminum alloy powder with a particle size of 75 - 150 μm to the mold, load vibration (or ultrasonic vibration) at the bottom of the mold to reduce internal voids. The mold is made of skd11 steel. The size of the die-casting mold is the diameter The depth is 20 mm. The ultrasonic power for mixing is 200 W, the ultrasonic amplitude is 5 μm, and the ultrasonic frequency is 28 kHz;

[0075] Load the mold into the temperature control module and adjust the temperature of the temperature control module. The temperature control module uses a heating module. The temperature increase is 200 °C.

[0076] Vacuum / atmosphere environment construction - pressurization. Protect the die-casting environment with an argon atmosphere. Use a pressurization module with ultrasonic vibration for pressurization. The pressure range is 200 MPa.

[0077] Maintain the pressure and achieve the integrated melting and mixing forming of the material by varying the ultrasonic power. After pressurization, keep the strength unchanged, and at the same time start ultrasonic vibration to heat and form the material. The ultrasonic power is 500 W, the ultrasonic amplitude is 3 μm, the ultrasonic frequency is 20 kHz; the ultrasonic action time is 100 s;

[0078] Unload the pressure at a unloading speed of 20 MPa / min.

[0079] Demold and take out the die-casting part.

[0080] Test Example 2

[0081] titanium alloy

[0082] Apply a demolding agent inside the mold. After adding TC4 titanium alloy powder with a particle size of 15 - 53 μm to the mold, load vibration (or ultrasonic vibration) at the bottom of the mold to reduce internal voids. The mold is made of skd11 steel. The size of the die-casting mold is the diameter The depth is 20 mm. The ultrasonic power for mixing is 100 W, the ultrasonic amplitude is 3 μm, and the ultrasonic frequency is 28 kHz;

[0083] Load the temperature control module. Load the mold into the temperature control module and adjust the temperature of the temperature control module. The temperature control module uses a heating module. The temperature increase is 100 °C.

[0084] Vacuum / atmosphere environment construction - pressurization. Protect the die-casting environment with an argon atmosphere. Use a pressurization module with ultrasonic vibration for pressurization. The pressure range is 100 MPa.

[0085] Maintain the pressure and achieve the integrated melting and mixing forming of the material by varying the ultrasonic power. After pressurization, keep the strength unchanged, and at the same time start ultrasonic vibration to heat and form the material. The ultrasonic power is 1000 W, the ultrasonic amplitude is 5 μm, the ultrasonic frequency is 17 kHz; the ultrasonic action time is 120 s;

[0086] Unload the pressure at a unloading speed of 10 MPa / min.

[0087] Demold and take out the die-casting part.

[0088] Test Example 3

[0089] amorphous alloy

[0090] Apply a mold release agent inside the mold. After adding V105s amorphous alloy powder with a particle size of 15μm - 53μm into the mold, the second ultrasonic oscillator at the bottom of the mold reduces the internal voids. The ultrasonic power of the second ultrasonic oscillator is 300W, the ultrasonic amplitude is 5μm, and the ultrasonic frequency is 35kHz. The mold is made of pure copper, and the die-casting mold size is 20mm in diameter and 20mm deep.

[0091] Load the mold into the temperature control module to adjust the temperature of the temperature control module. The temperature control module adopts a cooling mode and can cool the temperature to -60°C.

[0092] Protect the die-casting environment with an argon atmosphere. Use a pressurization module with a first ultrasonic oscillator to apply pressure. The pressure range of the pressurization module is 300MPa.

[0093] Achieve the melt-mixing integrated molding of the material by controlling the working parameters of the first ultrasonic oscillator. Specifically, after pressurization, keep the strength unchanged, and at the same time start the first ultrasonic oscillator to heat and mold the material.

[0094] As Figure 3 shown, use a 5x5 matrix array ultrasonic for molding. The power of the four first ultrasonic oscillators in the matrix areas a33, a34, a43, a44 is 2500W, the ultrasonic amplitude is 5μm, and the ultrasonic frequency is 28kHz. The power of the 12 oscillators in the matrix a22, a23, a24, a25, a32, a35, a42, a45, a52, a53, a54, a55 is 2000W, and the amplitude is 4μm. The power of the remaining oscillators is 1800w, the amplitude is 2μm, and the action time is 60s;

[0095] Then turn off the four first ultrasonic oscillators a33, a34, a43, a44, and adjust the power of the 12 first ultrasonic oscillators in the matrix a22, a23, a24, a25, a32, a35, a42, a45, a52, a53, a54, a55 to 2500W and the amplitude to 5μm. Adjust the power of the remaining first ultrasonic oscillators to 2000W and the amplitude to 4μm, and load for 80s;

[0096] Turn off the 12 first ultrasonic oscillators in the matrix a22, a23, a24, a25, a32, a35, a42, a45, a52, a53, a54, a55, and at the same time keep the four ultrasonic oscillators a33, a34, a43, a44 closed. Adjust the power of the remaining ultrasonic oscillators to 2500W and the amplitude to 5μm, and act for 120s.

[0097] The switching time of the ultrasonic oscillator switch is 0.05s.

[0098] Unload the pressure at a unloading speed of 10 MPa / min.

[0099] Demold and take out the die-casting part. Figure 5 As shown, a zirconium-based amorphous alloy block is obtained. Figure 6 As shown, the zirconium-based amorphous alloy block is in a specific amorphous state

[0100] Comparative Example 1. The difference between this comparative example and Test Example 3 is that the pressurization module in Comparative Example 1 does not add ultrasonic waves to the matrix array.

[0101] Figure 7 As shown, the hardness of the ultrasonic die-casting amorphous alloy in Test Example 3 is higher than that in Comparative Example 1. Figure 8 As shown, the porosity of the ultrasonic die-casting amorphous alloy in Test Example 3 is less than that in the comparative example. It can be seen that the performance of the amorphous alloy is effectively improved by ultrasonic die-casting in the present invention.

[0102] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0103] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0104] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0105] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, these terms have no special meanings, and thus should not be construed as limiting the protection scope of the present application.

[0106] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for directional additive manufacturing based on ultrasonic control, characterized in that: The following steps are involved: Filling a mold with metal powder, pressing the metal powder in the mold with a pressurizing module, and arranging a plurality of first ultrasonic vibrators on the pressurizing module so that each first ultrasonic vibrator contacts the metal powder in the mold; Setting the working parameters of each first ultrasonic vibrator according to the properties of the metal powder, wherein the working parameters include ultrasonic start time, ultrasonic end time, ultrasonic power, ultrasonic amplitude and ultrasonic frequency; The pressurizing pressure of the pressurizing module is maintained, and each first ultrasonic vibrator is started to heat the metal powder according to the set working parameters, so that the metal powder in the mold is directionally formed according to the set sequence to obtain a metal block.

2. The method for directed additive manufacturing based on ultrasonic control according to claim 1, characterized in that: When forming a bulk amorphous alloy, the metal powder region is divided into an inner region, a middle region, and an outer region arranged sequentially from the inside outward, and the heating stage of the metal powder is regulated by controlling the first ultrasonic vibrator, including: The first stage: the heating temperature is regulated to decrease from the inner area to the outside; The second stage: regulating the heating temperature to decrease from the inner region to the middle region, and from the middle region to the outer region, wherein the heating temperature of the outer region is higher than the heating temperature of the inner region; The third stage: regulating the heating temperature to increase from the inner area to the outer area; Among them, the maximum heating temperature of each area is the same.

3. The method for directed additive manufacturing based on ultrasonic control according to claim 1, characterized in that: The plurality of first ultrasonic vibrators are distributed on the pressurizing module in a matrix shape.

4. The method for directed additive manufacturing based on ultrasonic control according to claim 1, characterized in that: A second ultrasonic vibrator is arranged at the bottom of the mold, and before the pressurizing module is pressed together, the second ultrasonic vibrator is started to eliminate gaps between the metal powders.

5. The method for directional additive manufacturing based on ultrasonic control according to claim 1, characterized in that: The mold is placed in a temperature control module. When the metal powder is heated, the temperature control module is heated to heat the mold. When the metal block is cooled, the temperature control module is cooled to cool the mold. The temperature control module has a temperature rising range of 100 to 800°C and a temperature falling range of -75 to 0°C.

6. The method for directed additive manufacturing based on ultrasonic control according to claim 2, characterized in that: The working time of each stage of the first ultrasonic vibrator is 40 to 80 seconds.

7. The method for directional additive manufacturing based on ultrasonic control according to claim 1, characterized in that: The mold is placed in an atmosphere protection environment, wherein the atmosphere includes nitrogen, argon or carbon dioxide.

8. The method for directed additive manufacturing based on ultrasonic control according to claim 1, characterized in that: The ultrasonic power of the first ultrasonic vibrator is 100W to 2000W, the ultrasonic amplitude is 1 μm to 50 μm, and the ultrasonic frequency is 17 kHz to 28 kHz.

9. The method for directed additive manufacturing based on ultrasonic control according to claim 1, characterized in that: The pressure range of the pressurizing module is 1 MPa to 500 MPa.

10. A metal block, characterized in that: It is produced by the ultrasonically controlled directional additive manufacturing method according to any one of claims 1 to 9.

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