Additive manufacturing powder separation and recovery device

Abstract

The application aims to provide an additive manufacturing powder separation and recovery device, and relates to the technical field of mixed powder separation. The outlet of a separation chute is connected with the inlet of a first material collecting tank; the separation chute is arranged at a preset angle with a bottom plate; the outlet of a feeding tank is connected with the inlet of the separation chute; one end of a Y-junction pipe is connected with the lower surface of the separation chute; a through hole is arranged at the connection between the Y-junction pipe and the separation chute; the other end of the separation chute is connected with the inlet of a second material collecting tank; a first array plate and a second array plate are arranged in parallel on the two sides of the separation chute; the side of the first array plate and the second array plate close to the separation chute is provided with an ultrasonic transducer array; and the focus point of the ultrasonic transducer array is the through hole. The separation chute, the Y-junction pipe and the ultrasonic transducer array can improve the precision and efficiency of additive manufacturing powder separation and recovery.

Description

Technical Field

[0001] This invention relates to the field of mixed powder separation technology, and in particular to an additive manufacturing powder separation and recovery device. Background Technology

[0002] Additive manufacturing, a method of creating objects by stacking raw materials, offers several advantages over traditional parts manufacturing. It significantly reduces material waste and can produce near-net-shape parts, even for complex geometries. Additive manufacturing is virtually unrestricted by the geometry of the parts and requires no specialized tools, allowing for flexible and customized manufacturing. Due to these advantages, additive manufacturing technology is widely used in aerospace, automotive, medical, and energy fields. Powder bed fusion additive manufacturing is a promising technology that utilizes auxiliary structures and loose powder as supports to create parts of almost any shape. The basic principle involves spreading a layer of powder in a work cylinder. Then, under computer control and based on the slicing results of a 3D part graphic, the pre-placed powder layer is selectively melted and sintered through scanning. Next, the work cylinder descends by one slice thickness and powder is spread again. A high-energy beam, driven by the scanning system, then manufactures the next layer of the part according to the graphic data. By continuously repeating the powder spreading, high-energy beam scanning, and work cylinder descent steps, the entire 3D part is ultimately manufactured. To fully leverage the advantages of additive manufacturing, the powders used must be chemically and physically refined and of high quality. Powder parameters such as particle diameter, shape, and shape distribution directly affect powder deposition, and consequently, the strength and quality of the manufactured parts. For example, in laser powder bed fusion (LBD) additive manufacturing, powder particle sizes typically range from 15 μm to 45 μm. Due to the characteristics of additive manufacturing technology, the quality of the raw materials is crucial to product quality. Sieving of raw powders is necessary before and during additive manufacturing, and manual recovery of the powder bed is required after processing. These processes can lead to powder contamination, further impacting product quality. Common metal powders used in additive manufacturing include alloy powders, mixed metal powders, and pre-alloyed powders. Specific commonly used powders include titanium alloy powders, aluminum alloy powders, nickel-based alloy powders, and cobalt-based alloy powders. These powders can be selected based on specific application requirements and part specifications to meet the material properties, strength, and durability requirements of additive manufacturing. Some powders have complex manufacturing processes and high production costs, resulting in high prices. For example, the price of titanium alloy powder is affected by various factors, including particle composition, purity, particle size, production process, and market demand. High-purity titanium alloy powders with special alloys and specific particle size requirements are very expensive, which directly affects the cost and price of additive manufacturing products. Therefore, the separation and recycling of metal powders with various parameters is crucial for the development of additive manufacturing.

[0003] To separate different particles, the most common method is to use a vibrating screen to sieve mixed powders. Generally, when sieving metal powders of different diameters, ultrasonic vibration is applied to the screen using a vibrator, allowing the material to pass through the screen quickly and preventing the metal powder from adhering to the screen and causing blockages. Existing vibrating screens are widely used in powder sieving and recycling, but the powder sieving principle of a vibrating screen is determined by the size of the sieve openings. This means that a vibrating screen can only separate two types of powder particles with different diameters and good sphericity. Particles with similar diameters but different physical properties cannot be separated in this way. The mesh size of a vibrating screen is generally selected from 100 to 600 mesh, which is between 23 μm and 150 μm. When sieving two specific powder particles, only one type of sieve with a fixed mesh size is selected. If two other types of powder particles need to be sieved, the original sieve needs to be disassembled and replaced with one with a different mesh size. In additive manufacturing, different processes produce powders with varying particle sizes. For example, in laser powder bed fusion, the powder diameter typically ranges from 15μm to 45μm. Even when selecting a powder with a fixed particle size for a specific product, the actual particle size of the raw material will still have some error; it's a particle size distribution rather than a specific value. Therefore, the application of vibrating screens in the recovery of mixed powders from additive manufacturing is very limited. They cannot screen powders with a wide particle size range, different physical properties, or low sphericity. When screening other types of powders, a different vibrating screen is required, which increases the cost and workload of powder screening. Summary of the Invention

[0004] The purpose of this invention is to provide an additive manufacturing powder separation and recovery device that can improve the accuracy and efficiency of additive manufacturing powder separation and recovery.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] An additive manufacturing powder separation and recycling device, comprising:

[0007] Base plate, feeding box, separation chute, Y-shaped pipe, first collection box, second collection box, first array plate and second array plate;

[0008] Both the first and second collection boxes are mounted on the base plate;

[0009] The outlet of the separating chute is connected to the inlet of the first collection box; the separating chute is set at a preset angle to the bottom plate; the inlet height of the separating chute is greater than the outlet height of the separating chute; the feeding box is located directly above the inlet of the separating chute; the outlet of the feeding box is connected to the inlet of the separating chute.

[0010] One end of the Y-shaped pipe is connected to the separation slide on the lower surface of the separation slide; the separation slide is provided with a through hole; the through hole is provided at the connection between the Y-shaped pipe and the separation slide; the other end of the separation slide is connected to the inlet of the second collection box;

[0011] The first array plate and the second array plate are arranged parallel to each other on both sides of the separation slide; and the separation slide is parallel to the first array plate and the second array plate respectively; an ultrasonic transducer array is provided on the side of the first array plate and the second array plate near the separation slide; the focal point of the ultrasonic transducer array is the through hole;

[0012] The feeding box is used to feed the additive manufacturing powder to be separated, so that the additive manufacturing powder to be separated slides along the separation slide; the additive manufacturing powder to be separated includes target powder particles;

[0013] The ultrasonic transducer array is used to emit sound waves to apply acoustic radiation force to the additive manufacturing powder particles to be separated at the through-hole; the acoustic radiation force is equal to the gravity of the target powder particles;

[0014] The first collection box is used to hold the target powder; the target powder particles are suspended above the through hole due to the force of acoustic radiation and are suspended by the through hole due to inertia, and slide along the separation slide to the first collection box.

[0015] The second collection box is used to hold non-target powder; the gravity of the non-target powder particles is reduced by the acoustic radiation force at the through hole, and the reduced gravity enters the second collection box along the Y-junction pipe at the through hole.

[0016] Optionally, the additive manufacturing powder separation and recycling device further includes: a frame;

[0017] The frame is mounted on the base plate;

[0018] The frame is used to mount the feeding box, the separation chute, the first array plate, and the second array plate.

[0019] Optionally, the additive manufacturing powder separation and recovery device further includes: a flow control valve;

[0020] The flow control valve is located at the outlet of the feeding box.

[0021] Optionally, the preset angle is 30 degrees.

[0022] Optionally, the Y-shaped pipe is perpendicular to the base plate.

[0023] Optionally, the ultrasonic transducer array is an 8×8 ultrasonic transducer array.

[0024] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0025] The purpose of this invention is to provide an additive manufacturing powder separation and recovery device. This device utilizes the acoustic radiation force generated by an ultrasonic phased array to provide a non-contact, non-destructive separation method for mixed powder particles. This recovery device can separate additive manufacturing powders with different physical properties, regardless of the particle diameter. Furthermore, when separating different powders, there is no need to adjust or switch the parts or structure of the device. Only the intensity and position of the acoustic radiation force generated by the phased array need to be adjusted, which can improve the accuracy and efficiency of additive manufacturing powder separation and recovery. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the additive manufacturing powder separation and recovery device in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of a single-axis ultrasonic transducer in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of a transversely symmetrical ultrasonic transducer in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the first principle of ultrasonic phased array focusing in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the second principle of ultrasonic phased array focusing in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the cross-section of the Y-shaped pipe in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the ultrasonic transducer array in an embodiment of the present invention;

[0034] Figure 8 This is a flowchart illustrating the process of the additive manufacturing powder separation and recovery device in an embodiment of the present invention.

[0035] Figure 9 This is a schematic diagram illustrating the separation principle of particle A in an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram illustrating the separation principle of particle B in an embodiment of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The purpose of this invention is to provide an additive manufacturing powder separation and recovery device that can improve the accuracy and efficiency of additive manufacturing powder separation and recovery.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example

[0041] like Figure 1As shown, this embodiment provides an additive manufacturing powder separation and recovery device, including: a base plate, a feeding box, a separation chute, a Y-junction pipe, a first collection box, a second collection box, a first array plate, and a second array plate; both the first and second collection boxes are disposed on the base plate; and the outlet of the separation chute is connected to the inlet of the first collection box; the separation chute is set at a preset angle to the base plate; the preset angle is 30 degrees. The inlet height of the separation chute is greater than the outlet height of the separation chute; the feeding box is disposed directly above the inlet of the separation chute; the outlet of the feeding box is connected to the inlet of the separation chute; one end of the Y-junction pipe is connected to the separation chute on the lower surface of the separation chute; the Y-junction pipe is perpendicular to the base plate. A through hole is provided on the separation slide; the through hole is located at the connection between the Y-junction pipe and the separation slide; the other end of the separation slide is connected to the inlet of the second collection box; the first array plate and the second array plate are arranged parallel to each other on both sides of the separation slide; and the separation slide is parallel to the first array plate and the second array plate respectively; an ultrasonic transducer array is provided on the side of the first array plate and the second array plate near the separation slide; the ultrasonic transducer array is an 8×8 ultrasonic transducer array. The focal point of the ultrasonic transducer array is at the through-hole; the feeding box is used to feed the additive manufacturing powder to be separated, allowing the powder to slide along the separation track; the additive manufacturing powder to be separated includes target powder particles; the ultrasonic transducer array is used to emit sound waves to apply acoustic radiation force to the additive manufacturing powder particles to be separated at the through-hole; the acoustic radiation force is equal to the gravity of the target powder particles; the first collection box is used to hold the target powder; the gravity of the target powder particles at the through-hole is canceled out by the acoustic radiation force, they are suspended above the through-hole and pass through the through-hole by inertia, sliding along the separation track to the first collection box; the second collection box is used to hold non-target powder; the gravity of the non-target powder particles at the through-hole is reduced by the acoustic radiation force, and the reduced gravity enters the second collection box along the Y-junction pipe at the through-hole.

[0042] The additive manufacturing powder separation and recycling device also includes: a frame; the frame is mounted on the base plate;

[0043] The frame is used to mount the feeding box, the separation chute, the first array plate, and the second array plate.

[0044] The additive manufacturing powder separation and recovery device also includes: a flow control valve; the flow control valve is located at the outlet of the feeding box.

[0045] Acoustic radiation force (ARF) is simply the time-averaged pressure exerted by a nonlinear sound field on an object along the path of a traveling or standing wave. It is the result of momentum transfer between the sound field and the object, and can exert force on objects at a distance. Sound waves are mechanical waves that propagate in elastic media, reflecting the periodic expansion and compression of the elastic medium caused by the vibration of the sound source. Sound waves carry momentum and energy. When sound waves encounter obstacles during propagation, they produce physical effects such as reflection, refraction, and scattering on the object's surface, exchanging momentum and energy with the object. This exchange manifests macroscopically as a force exerted by the sound wave on the object, called acoustic radiation force. According to the law of conservation of momentum in a sound field, the general expression for the linear sound wave radiation force is:

[0046] F=-∫∫ s <t>dS (1).

[0047] Where dS = ndS, n is the normal unit vector of the object's surface, S is the object's surface, and <T> is the average acoustic radiation stress tensor, the specific expression of which is:

[0048]

[0049] Where p and v are the sound pressure and particle velocity, respectively, I represents the second-order unit tensor, ρ0 and c0 are the fluid density and longitudinal wave velocity, respectively, and <> represents the time averaging of the physical quantities.

[0050] As can be seen from the acoustic radiation tensor expression, the acoustic radiation force consists of two parts: first, the contribution of the average term of the sound field, corresponding to the first term of the expression, where the positive and negative values ​​of the sound pressure p within one period completely cancel each other out; and second, the contribution of the fluid momentum flow, corresponding to the second phase term of the expression, which is independent of the nonlinearity of the sound field.

[0051] like Figure 2 As shown, when the ultrasonic waves emitted by the ultrasonic transducer reach the reflecting surface, they form reflected sound waves. These reflected sound waves superimpose with the emitted sound waves, thus generating a standing wave. During its action, the standing wave continuously applies sound pressure to the particles. Within one cycle, the particles experience upward sound pressure for half the cycle and downward sound pressure for the other half; that is, the positive and negative values ​​of the sound pressure p completely cancel each other out within one cycle. The nodes of the standing wave are acoustic potential traps, which can capture particles.

[0052] The acoustic radiation force generated by a single-axis ultrasonic transducer is very small, and its effect on particles is very limited. However, by arranging numerous ultrasonic transducer arrays in a certain manner as the transmitting end, and replacing the reflecting surface with the same ultrasonic transducer array, a stable, positionally adjustable, and radiation force-adjustable acoustic potential trap can be generated between two ultrasonic transducer arrays by modulating the phase of numerous ultrasonic transducers. This is equivalent to the superposition effect of numerous ultrasonic transducers, and particles can be trapped at the acoustic trap. Figure 3 As shown.

[0053] like Figure 3 As shown, this relatively arranged ultrasonic phased array can capture particles at the focal point. At this point, the direction of the acoustic radiation force on the particle is vertically upward, expressed as:

[0054]

[0055] Where A is the root mean square amplitude, V is the particle volume, ρ is the particle density, c is the speed of sound in air, w is the angular velocity, x is the position variable, and λ is the wavelength of the sound wave. From this formula, it can be seen that, under certain sound wave conditions, the sound radiation force experienced by a particle is related to the particle's density and diameter, that is, it is related to V / ρ in the formula.

[0056] An ultrasonic phased array is an array of ultrasonic transmitters consisting of many transmitters. It can control the formation and direction of the beam through phase modulation. By adjusting the phase difference between the individual transmitters, the sound waves emitted by the numerous transmitters can form a focused gain of acoustic radiation force at a specific location, thereby applying acoustic radiation force to the object at the focal point to manipulate particles. Figures 4-5 This is a schematic diagram illustrating the principle of phase modulation. The distance difference between transducer 1 and transducer n to the target focal point is dn. If a focusing gain is achieved at the focal point, the ultrasonic beams emitted by transducers 1 and n need to arrive at the focal point simultaneously. This means transducer n needs a delay of Tn = dn / c seconds, where dn is the transducer difference and c is the speed of sound. Therefore, the delay times of other transducers can be obtained in the same way. Considering that phased array focusing involves sound waves arriving at the focal point with the same phase and that the sound waves are emitted continuously, the delay time Tn can be simplified to Tn%T, where % is the remainder and T is the ultrasonic frequency period. That is, if Tn is greater than the ultrasonic period, the integer multiples T within Tn are removed, and only the remainder of Tn / T is delayed. This allows multiple transducer arrays to simultaneously emit phase-modulated ultrasonic waves within a macroscopic timeframe less than or equal to one frequency period, eliminating the loss of the focusing potential well caused by the long delay during phase adjustment.

[0057] Adjusting the transducer phase and driving power of the ultrasonic phased array allows for the adjustment of the three-dimensional position of the focal point and the intensity of the acoustic radiation force.

[0058] The specific structure of the present invention is as follows: Figure 1 As shown, the key components are the ultrasonic transducer and the separating slide. A flow control valve is installed at the outlet of the feeding box, and the outlet of the flow control valve connects to the inlet of the separating slide. Two array plates are installed on the left and right sides of the separating slide, and an array of ultrasonic transducers is installed on the inner side of the array plates. The feeding box, array plates, and separating slide are all mounted on the frame. The middle section of the separating slide has a vertically downward Y-shaped pipe, and a collection box is located below the separating pipe and below the outlet of the separating slide. The collection box, collection box, and frame are all placed on the base plate. The separating slide forms a 30° angle with the horizontal plane, and the Y-shaped pipe in the middle of the separating slide separates from the separating slide, forming a Y-shaped fork, pointing vertically downwards, as shown. Figure 6 As shown, the ultrasonic transducer array is installed inside the array plate in an 8×8 arrangement, as... Figure 7 As shown.

[0059] The additive manufacturing powder separation and recycling device provided in this embodiment is used as follows: Figure 8 The following will use AlSi10Mg aluminum alloy powder and NiTi titanium alloy powder, commonly used in laser powder bed fusion (LPBF) in additive manufacturing, as examples to explain the operation of this device. Both powders have a diameter of 30 μm, with AlSi10Mg powder having a density of 2.68 g / cm³. 3 The density of NiTi powder is 6.5 g / cm³. 3 .

[0060] First, start the ultrasonic phased array, adjust the focal point of the ultrasonic phased array to the Y-junction separation point of the slide, and select the intensity of the ultrasonic phased array drive according to the formula of powder density and acoustic radiation force, so that the acoustic radiation force at the focal point can just counteract the gravity of AlSi10Mg powder particles.

[0061] Next, the mixed powder of AlSi10Mg and NiTi to be recycled is added to the feeding box, and the flow control valve is opened to ensure that the powder in the feeding box passes through at a stable flow rate.

[0062] Then, the mixed powder falling through the flow control valve will fall into the inlet of the chute, and the particles will begin to slide down the chute due to gravity, and the sliding of the particles will tend to a stable speed.

[0063] Furthermore, when the mixed powder particles slide down to the Y-junction separation point of the slide, AlSi10Mg particles pass through smoothly, while NiTi particles fall into the separation channel at the Y-junction.

[0064] Finally, NiTi falls down the separation pipe into the collection box 2 below, while AlSi10Mg particles continue to slide down the slide and fall into the collection box 1 below the end of the slide.

[0065] This completes the separation and recovery of the two additive manufacturing mixed powder particles.

[0066] The principle of separation at the Y-junction of the slideway will be explained below based on the above usage process. For example... Figures 9-10 As shown, ① represents the particle sliding process ①, ② represents the particle sliding process ②, and ③ represents the sliding process ③. Assume that AlSi10Mg particles are particles A and NiTi particles are particles B, and the elliptical dashed line is the focal point of the ultrasonic phased array.

[0067] Process ①: As particle A slides down the track, it changes from being at rest to sliding at a constant speed. The frictional force F acting on particle A during this process is... fA With the support force N of the slide A The direction of the resultant force is the same as that of gravity G. A The forces are opposite in direction but equal in magnitude, as shown in process ① for particle A. Ultimately, the net force on particle A is zero, and the particle slides down the track at a constant speed.

[0068] As particle B slides down the track, it changes from being at rest to sliding at a constant speed. The frictional force F acting on particle B during this uniform sliding process is... fB With the support force N of the slide B The direction of the resultant force is the same as that of gravity G. B The forces are opposite in direction but equal in magnitude, as shown in process ① for particle B. Ultimately, the net force on particle B is zero, and the particle slides down the track at a constant speed.

[0069] Process ②: When particle A slides down to the focal point generated by the ultrasonic phased array, the particle no longer contacts the slide rail, so the frictional force F of the slide rail decreases. fA and the slide support force N A Disappears. Because particle A is at the focal point, particle A experiences an upward acoustic radiation force F. ARFA As shown in formula (3).

[0070] When particle B slides down to the focal point generated by the ultrasonic phased array, the particle no longer contacts the slide rail, therefore the frictional force F of the slide rail... fB and the slide support force N B Disappears. Because particle B is at the focal point, it experiences an upward acoustic radiation force F. ARFB As shown in formula (3).

[0071] Since particles A and B have the same diameter, but particle B has a higher density than particle A, and the particle-related parameter in the formula is V / ρ, the acoustic radiation force experienced by particle B is less than that experienced by particle A, and both are directed vertically upwards.

[0072] At this moment, particle A experiences acoustic radiation force F. ARFA The magnitude is equal to the gravitational force G acting on it. A Ultimately, the net force on particle A is 0, and due to inertia, the particle continues to slide down the track at a constant speed.

[0073] At this moment, particle B experiences acoustic radiation force F ARFB The magnitude is smaller than the gravitational force G it experiences. B The final net force on particle B is G. B -F ARFB The direction is vertically downwards. The particle is subjected to a downward net force and begins to fall along the Y-shaped slide channel.

[0074] Process ③: After passing through Process ②, particle A returns to the slide and continues to slide down the slide at a constant speed, experiencing the same forces as in Process ①. After passing through Process ②, particle B continues to fall until it leaves the focal point; at this point, particle B is only subject to gravity G. B Its effect is to continue falling.

[0075] In addition to the same volume but different density, this principle can also be applied to the separation of mixed powder particles with similar density but different volume. The principle is similar to the above, only the corresponding parameters of V / ρ in formula (3) need to be changed.

[0076] This embodiment provides an additive manufacturing powder separation and recovery device with adjustable acoustic radiation force and focusing position. It offers a non-contact, non-destructive method for separating mixed powders in the field of additive manufacturing powder recovery. It can separate mixed powder particles with similar densities but different diameters, or separate mixed powder particles with similar diameters but different densities. This invention does not require a difference in diameter between the two mixed powders during the separation process. As is well known, as long as two different powder particles have different constituent substances, their density, bulk modulus, and other physical properties will always differ. Furthermore, due to the different mass, diameter, and shape parameters required during the manufacturing process of different powder particles, the overall differences between different particles will increase. For these different parameters, any difference in any parameter can serve as the basis for powder particle separation in this invention, and is not limited to differences in particle diameter. In summary, this invention can separate powder particles with the same shape and size but different substances, as well as powder particles with different shape and size but the same substance.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Furthermore, those skilled in the art will recognize that, based on the concept of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as limiting the invention.< / t>

Claims

1. An additive manufacturing powder separation and recovery device, characterized in that, include: Base plate, feeding box, separation chute, Y-shaped pipe, first collection box, second collection box, first array plate and second array plate; Both the first and second collection boxes are mounted on the base plate; The outlet of the separating chute is connected to the inlet of the first collection box; the separating chute is set at a preset angle to the bottom plate; the inlet height of the separating chute is greater than the outlet height of the separating chute; the feeding box is located directly above the inlet of the separating chute; the outlet of the feeding box is connected to the inlet of the separating chute. One end of the Y-shaped pipe is connected to the separation slide on the lower surface of the separation slide; the separation slide is provided with a through hole; the through hole is provided at the connection between the Y-shaped pipe and the separation slide; the other end of the separation slide is connected to the inlet of the second collection box; The first array plate and the second array plate are arranged parallel to each other on both sides of the separation slide; and the separation slide is parallel to the first array plate and the second array plate respectively; an ultrasonic transducer array is provided on the side of the first array plate and the second array plate near the separation slide; the focal point of the ultrasonic transducer array is the through hole; The feeding box is used to feed the additive manufacturing powder to be separated, so that the additive manufacturing powder to be separated slides along the separation slide; the additive manufacturing powder to be separated includes target powder particles; The ultrasonic transducer array is used to emit sound waves to apply acoustic radiation force to the additive manufacturing powder particles to be separated at the through-hole; the acoustic radiation force is equal to the gravity of the target powder particles; The first collection box is used to hold the target powder; the target powder particles are suspended above the through hole due to the force of acoustic radiation and are suspended by the through hole due to inertia, and slide along the separation slide to the first collection box. The second collection box is used to hold non-target powder; the gravity of the non-target powder particles is reduced by the acoustic radiation force at the through hole, and the reduced gravity enters the second collection box along the Y-junction pipe at the through hole.

2. The additive manufacturing powder separation and recovery device according to claim 1, characterized in that, The additive manufacturing powder separation and recovery device further includes: a frame; The frame is mounted on the base plate; The frame is used to mount the feeding box, the separation chute, the first array plate, and the second array plate.

3. The additive manufacturing powder separation and recovery device according to claim 1, characterized in that, The additive manufacturing powder separation and recovery device further includes: a flow control valve; The flow control valve is located at the outlet of the feeding box.

4. The additive manufacturing powder separation and recovery device according to claim 1, characterized in that, The preset angle is 30 degrees.

5. The additive manufacturing powder separation and recovery device according to claim 1, characterized in that, The Y-shaped pipe is perpendicular to the base plate.

6. The additive manufacturing powder separation and recovery device according to claim 1, characterized in that, The ultrasonic transducer array is an 8×8 ultrasonic transducer array.

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