Additive manufactured part and powder cleaning method thereof

Abstract

This invention relates to the field of additive manufacturing technology and discloses an additively manufactured part (1), including a part body (11). The part body has a flow channel cavity inside, comprising an inlet section (12), a branch section (14), and an outlet section (13) arranged sequentially along the flow direction of the cooling medium. The branch section includes multiple branch channels connected in parallel between the inlet and outlet sections. Each branch channel is connected to a process hole (15) from the side. The outlet end of the process hole extends to the surface of the part body. The process hole is configured to seal the branch channels connected to it by inserting a cylindrical plug (2). This invention also discloses a powder cleaning method based on this additively manufactured part. By selectively sealing the branch channels through the process hole, high-pressure gas introduced into the flow channel cavity is used to purge the powder in the unsealed branch channels, thereby achieving individual cleaning of each branch channel and ensuring complete removal of powder from the additively manufactured part.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, specifically to an additively manufactured part and a method for cleaning its powder. Background Technology

[0002] Additive manufacturing, commonly known as 3D printing, is a manufacturing technology based on the discrete-stacking principle. It integrates computer-aided design, materials processing, and forming technologies. Using digital model files as a foundation, software and CNC systems are used to layer and stack specialized metallic, non-metallic, and medical / biomaterials to create various industrial, everyday products, or works of art through non-removable processing. Additive manufacturing is not limited by the complexity of shapes and can create complex shapes or cavities that are impossible to manufacture using traditional techniques. Additive parts such as tooling and molds with conformal flow channels are widely used in production.

[0003] When printing conformal flow channel additive parts, high-precision selective laser sintering (SLS) and selective laser melting (SLM) technologies are typically used. Both belong to powder bed fusion (PBF) processes, which use high-energy lasers to sinter and melt non-metallic or metallic powders to obtain additive parts. After printing, the flow channels of these additive parts are filled with unsintered or unmelted powder, which needs to be removed through a powder cleaning process. Otherwise, the residual powder is prone to forming caking during subsequent heat treatment and machining, affecting the heat exchange efficiency of the additive part and even causing it to be scrapped. Existing powder cleaning processes involve first placing the 3D printed part into a powder cleaning device, continuously vibrating and turning it to shake off most of the loose powder material, and then passing high-pressure gas into the flow channels to blow out the residual powder. However, for additive parts with multi-branch flow channels, incomplete powder cleaning often occurs in actual processes. Technicians' analysis revealed that when cleaning powder from additive manufacturing parts with multiple branch channels, if high-pressure gas is introduced into the inlet or outlet section of the main channel, the high-pressure gas simultaneously enters each branch channel. Due to differences in the shape of each branch channel, the amount of residual powder, and the flow resistance, the high-pressure gas will preferentially pass through the branch channels with lower flow resistance, blowing out the residual powder in those branch channels, further reducing the flow resistance and increasing the airflow rate. Conversely, the airflow rate in other branch channels with higher flow resistance will be insufficient, resulting in the powder in these branch channels not being effectively cleaned, ultimately leading to incomplete powder cleaning within the additive manufacturing part.

[0004] The information disclosed in this background section is only for understanding the background technology of the present invention concept, and may include information that does not constitute prior art. Summary of the Invention

[0005] One objective of this invention is to provide an additive manufacturing part that solves the problem of incomplete powder cleaning in additive manufacturing parts with multi-branch flow channels in the prior art; another objective is to provide a powder cleaning method for additive manufacturing parts.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An additive manufacturing part includes a part body with a flow channel cavity inside the part body for containing a cooling medium. The flow channel cavity includes an inlet section, a branch section, and an outlet section arranged sequentially along the flow direction of the cooling medium. The branch section includes multiple branch flow channels connected in parallel between the inlet section and the outlet section. Each branch flow channel is connected to a process hole from the side. The outlet end of the process hole extends to the surface of the part body. The process hole is configured to be able to seal the branch flow channel connected to it by inserting a cylindrical plug therein.

[0008] Based on the above technical means, a new additive manufacturing part is provided. When cleaning the powder from the additive manufacturing part, the branch channels can be selectively blocked through the process holes, and the high-pressure gas introduced into the channel cavity can be controlled to enter the expected branch channels and purge the powder in the expected branch channels. This achieves the cleaning of each branch channel one by one, ensuring that there is sufficient airflow and pressure in each branch channel. This solves the problem that the powder in the high flow resistance branch channels cannot be effectively cleaned in the prior art, ensuring that the powder in the additive manufacturing part can be completely cleaned.

[0009] Furthermore, the process holes are straight holes.

[0010] The aforementioned technical means ensure that the cylindrical plug can be smoothly inserted into the process hole.

[0011] Furthermore, the extension direction of the process hole is perpendicular to the flow direction at the connection between the process hole and the branch flow channel.

[0012] According to the above-mentioned technical means, the plunger can be inserted vertically into the branch channel from the side, and the longitudinal section of the plunger is perpendicular to the cross section of the branch channel, thereby improving the sealing effect.

[0013] Furthermore, the inner diameter of the process orifice is greater than or equal to the inner diameter of the branch channel connected to the process orifice.

[0014] Based on the above technical means, the cylindrical plug is ensured to be large enough to completely block the branch flow channel.

[0015] A powder cleaning method for additive manufacturing parts includes the following steps:

[0016] (a) Provide the above-mentioned additive manufacturing parts;

[0017] (b) Insert cylindrical plugs into each process hole to seal the outlet end of each process hole;

[0018] (c) Identify a branch flow channel to be cleaned and seal the remaining branch flow channels with a cylindrical plug;

[0019] (d) Introduce high-pressure gas into the inlet or outlet section to remove powder from the branch channel to be cleaned;

[0020] (e) Repeat steps (c) and (d) above until all powder in the branch channels is removed.

[0021] Based on the above technical means, the branch flow channels can be selectively blocked, and the high-pressure gas introduced into the flow channel cavity can be controlled to enter the expected branch flow channel and purge the powder in the expected branch flow channel, thereby achieving the cleaning of each branch flow channel one by one, ensuring that there is sufficient air flow and pressure in each branch flow channel; solving the problem that the powder in the high flow resistance branch flow channel cannot be effectively cleaned in the prior art, and ensuring that the powder in the additive part can be completely cleaned.

[0022] Furthermore, the method of introducing high-pressure gas into the inlet or outlet section includes: sealing the inlet or outlet section with a plug, and then injecting high-pressure gas into the inlet or outlet section through a nozzle passing through the plug.

[0023] Based on the above technical means, by using a plug and a nozzle to introduce high-pressure gas into the inlet or outlet section, it is possible to prevent the introduced high-pressure gas from escaping from the inlet end and increase the gas flow rate and pressure in the flow channel cavity.

[0024] Furthermore, after performing step (e), the procedure also includes the step of filling and sealing the process hole with a metal rod of the same length as the depth of the process hole.

[0025] The above-mentioned technical means are used to prevent the cooling medium from accumulating in the process holes and forming unexpected heat spots or temperature gradients during the use of additive parts, which would affect the flow of the cooling medium and the cooling effect.

[0026] Furthermore, the length of the plunger is greater than the length of the process hole into which the plunger is inserted.

[0027] Based on the above technical means, it is ensured that the plunger can extend into the branch flow channel, thereby achieving the sealing of the branch flow channel.

[0028] Furthermore, the plunger is made of an elastic material.

[0029] Based on the above technical means, the elasticity of the plunger allows the front end of the plunger to adapt to the shape of the branch flow channel to be blocked, thereby making the front end of the plunger fit tightly against the inner wall of the branch flow channel, thus improving the blocking effect.

[0030] Furthermore, the end of the cylindrical plug is rounded.

[0031] Based on the aforementioned technical means, the round head of the cylindrical plug can closely abut against the arc-shaped inner wall of the branch channel, thereby improving the sealing effect.

[0032] The beneficial effects of this invention are:

[0033] (1) The additive manufacturing part of the present invention is provided with a process hole that connects to the branch flow channel from the side. When cleaning the powder of the additive manufacturing part, the branch flow channel can be selectively blocked through the process hole, and the high-pressure gas introduced into the flow channel cavity can be controlled to enter the expected branch flow channel and blow away the powder in the expected branch flow channel, thereby achieving the cleaning of each branch flow channel one by one. This solves the problem in the prior art that when high-pressure gas is introduced into each branch flow channel at the same time, the air flow in the branch flow channel with larger flow resistance is insufficient due to the different flow resistance of each branch flow channel, which leads to the inability to effectively clean the powder in the branch flow channel with larger flow resistance. This ensures that the powder in the additive manufacturing part can be completely cleaned.

[0034] (2) The additive parts of the present invention can be manufactured by 3D printing technology and are compatible with existing technologies. The powder cleaning method based on the additive parts is easy to operate and has a good powder cleaning effect, which greatly reduces the scrap rate of multi-branch channel additive parts caused by residual powder caking, and is easy to promote and apply. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of an additively manufactured part in one embodiment;

[0036] Figure 2 This is a flowchart illustrating the steps of a powder cleaning method for an additively manufactured part in one embodiment;

[0037] Figures 3-4 This is a schematic diagram illustrating the cleaning of powder within each branch channel in one embodiment;

[0038] Figure 5 This is a schematic diagram of filling and sealing the process hole with a metal rod in one embodiment.

[0039] Among them, 1-additive manufacturing part; 11-part body; 12-inlet section; 13-outlet section; 14-branch section; 141-first branch flow channel; 142-second branch flow channel; 15-process hole; 2-pillar plug; 3-plug; 4-nozzle; 5-metal rod; 6-weld point. Detailed Implementation

[0040] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0041] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0042] Reference Figure 1 This embodiment proposes an additive manufacturing part 1, including a part body 11. The part body 11 has a flow channel cavity for containing a cooling medium. The flow channel cavity includes an inlet section 12, a branch section 14 and an outlet section 13 arranged sequentially along the flow direction of the cooling medium. The inlet of the inlet section 12 and the outlet of the outlet section 13 both extend to the surface of the part body 11. The branch section 14 includes a first branch flow channel 141 and a second branch flow channel 142 connected in parallel between the inlet section 12 and the outlet section 13. Each branch flow channel is connected to a process hole 15 from the side. The outlet end of the process hole 15 extends to the surface of the part body 11. The process hole 15 is configured to be able to block the branch flow channel connected to it by inserting a cylindrical plug 2 inside it. When cleaning the powder from the additive part 1, the branch channels can be selectively blocked through the process hole 15, allowing the high-pressure gas introduced into the channel cavity to enter the unblocked branch channels and purge the powder in the unblocked branch channels, thereby achieving cleaning of each branch channel one by one; avoiding the problem in the prior art where the high-pressure gas only passes through the branch channels with lower flow resistance due to the different flow resistance of each branch channel, resulting in incomplete powder cleaning of the branch channels with higher flow resistance.

[0043] In this embodiment, for example, the branch segment 14 includes two branch channels, namely the first branch channel 141 and the second branch channel 142. However, it should be noted that the number of branch channels can be set to more than two as needed. In addition, each branch channel can be set to a straight, curved, or spiral shape as needed, preferably curved or spiral. Curved or spiral branch channels usually have higher flow resistance and are more likely to cause problems such as incomplete powder cleaning due to insufficient air flow. The additive manufacturing part 1 provided in this embodiment can clean each branch channel one by one to ensure that there is sufficient air flow in each branch channel.

[0044] In this embodiment, to ensure that the plunger 2 can be smoothly inserted into the process hole 15, the process hole 15 is configured as a straight hole; furthermore, the extending direction of the process hole 15 is perpendicular to the flow direction at the connection between the process hole 15 and the branch flow channel, so that the plunger 2 can be inserted vertically into the branch flow channel from the side, and the longitudinal section of the plunger 2 is perpendicular to the cross-section of the branch flow channel, thereby improving the sealing effect. The flow direction refers to the flow direction of the medium in the flow channel. It should be noted that... Figure 1 The perpendicular relationship between the extension direction of the process hole 15 and the flow channel direction is not precisely illustrated. It is easy to understand that the process hole 15 can extend to any surface of the main body 11 in any set direction, thereby ensuring that the extension direction of the process hole 15 is perpendicular to the flow channel direction at the connection between the process hole 15 and the branch flow channel.

[0045] In this embodiment, the inner diameter of the process hole 15 is greater than or equal to the inner diameter of the branch channel connected to the process hole 15, to ensure that the cylindrical plug 2 has a sufficiently large size to completely block the branch channel. For example, the inner diameter of the branch channel is 8 mm, and the inner diameter of the process hole 15 is 8 mm. Furthermore, the process hole 15 is a circular hole, meaning its cross-section is circular, and the cylindrical plug 2 can also be cylindrical to adapt its shape to the process hole 15, thereby improving the sealing effect of the cylindrical plug 2 on the process hole 15.

[0046] This embodiment also proposes a powder cleaning method for additively manufactured parts, referring to... Figure 2 At the same time, refer to Figures 3-4 The method includes the following steps S1-S5.

[0047] Step S1: Provide the additive manufacturing part 1 described above;

[0048] Step S2: Insert cylindrical plugs 2 into each process hole 15 to seal the outlet end of each process hole 15;

[0049] Step S3: Identify a branch flow channel to be cleaned and block the remaining branch flow channels using the cylindrical plug 2;

[0050] Step S4: Introduce high-pressure gas into the inlet section 12 or the outlet section 13 to clean the powder in the branch flow channel to be cleaned;

[0051] Step S5: Repeat steps S3 and S4 above until all powder in the branch channels is cleaned up.

[0052] When cleaning the powder of the additive part 1 using the above method, the branch channels can be selectively blocked through the process hole 15, allowing the high-pressure gas introduced into the channel cavity to enter the unblocked branch channels and purge the powder in the unblocked branch channels. Therefore, it is possible to clean each branch channel one by one. This avoids the problem in the prior art where the high-pressure gas only passes through the branch channels with lower flow resistance due to the different flow resistance of each branch channel, resulting in incomplete powder cleaning of the branch channels with higher flow resistance.

[0053] The following will combine Figures 3-4 The powder cleaning method for additive manufacturing part 1 proposed in this embodiment will be described in detail for each step, wherein, Figure 3 The diagram shown is a schematic of cleaning the powder in the first branch channel 141 in this embodiment. Figure 4 The diagram shown is a schematic of cleaning the powder in the second branch channel 142 in this embodiment.

[0054] First, step S1 is performed to provide the additive part 1 described above. This additive part 1 can be used as a mold, tooling, or component, and can be manufactured using 3D printing technology. The manufacturing method can be as follows: first, a 3D model of the additive part 1 is created using 3D design software such as UG or CAD, and the 3D data of the additive part 1 is obtained. Then, a 3D printing device prints the 3D part on a printing substrate based on the 3D model and 3D data. Finally, the 3D part is cut and separated from the printing substrate to obtain the additive part 1. This manufacturing method allows for the simultaneous printing of process holes 15 and flow channel cavities, reducing manufacturing difficulty. Alternatively, the manufacturing method for the additive part 1 can be as follows: first, a part body 11 with flow channel cavities but without process holes is formed using 3D printing technology, and process hole markings are printed on the assembly surface of the part body 11. Then, process holes 15 are formed at the process hole markings using machining processes, ultimately obtaining the additive part 1 described above.

[0055] Before performing subsequent steps on the additive part 1, the process includes vibrating and flipping the additive part 1 to shake off and clean loose powder by mechanical force, thereby initially reducing the powder content inside the additive part 1. The vibration and flipping operation can be performed using conventional powder cleaning equipment. Due to the complex multi-branched flow channel structure, powder is more likely to remain in the flow channel cavity of the additive part 1, and the remaining powder cannot be removed by conventional powder cleaning equipment.

[0056] Then, step S2 is performed, inserting cylindrical plugs 2 into each process hole 15 to seal the outlet end of each process hole 15. The cylindrical plugs 2 are inserted into the process holes 15 to a suitable depth, and the outer side of the cylindrical plugs 2 is in close contact with the inner wall of the process holes 15. It should be noted that the cylindrical plugs 2 can effectively scrape away the powder in the process holes 15 during insertion and withdrawal, thereby preventing powder residue in the process holes 15.

[0057] In this embodiment, for example, the cross-section of the branch channel is circular. To ensure that the front end of the cylindrical plug 2 can tightly abut against the inner wall of the branch channel, the end of the cylindrical plug 2 is rounded. When the cylindrical plug 2 is inserted into the branch channel, this end can tightly abut against the arc-shaped inner wall of the branch channel, thereby improving the sealing effect.

[0058] In this embodiment, the material of the plunger 2 is an elastic material, such as rubber, so that the front end of the plunger 2 can adapt to the shape of the branch channel to be blocked by the elasticity of the plunger 2, thereby making the front end of the plunger 2 fit tightly against the inner wall of the branch channel, thereby improving the blocking effect.

[0059] Next, step S3 is executed to identify a branch flow channel to be cleaned, and the remaining branch flow channels are blocked using the cylindrical plug 2 to increase the flow resistance in the blocked branch flow channels. (Refer to...) Figure 3 The method for sealing the branch flow channel using the plunger 2 is as follows: Adjust the insertion depth of the plunger 2 into the process hole 15 so that the front end of the plunger 2 extends into the branch flow channel and abuts against the side wall of the branch flow channel, thereby sealing the branch flow channel. The length of the plunger 2 is greater than the length of the process hole 15 into which it is inserted to ensure that the plunger 2 can extend into the branch flow channel, thus achieving the sealing of the branch flow channel. Similarly, adjusting the insertion depth of the plunger 2 into the process hole 15 so that the front end of the plunger 2 disengages from the branch flow channel can release the sealing of the branch flow channel. It should be noted that when the plunger 2 seals the branch flow channel, it is not necessary to strictly meet airtightness requirements; it is only necessary to ensure that the flow resistance within the sealed branch flow channel increases. In this way, less or even very little high-pressure gas passes through the sealed branch flow channel, while more high-pressure gas passes through the unsealed branch flow channel, increasing the gas flow rate in the unsealed branch flow channel, thereby improving the powder cleaning effect. In this embodiment, the additive manufacturing part 1 is provided with two branch channels, namely the first branch channel 141 and the second branch channel 142. If the branch channel to be cleaned is determined to be the first branch channel 141, then the remaining branch channels are the second branch channel 142; if the branch channel to be cleaned is determined to be the second branch channel 142, then the remaining branch channels are the first branch channel 141.

[0060] Then, continue to refer to Figure 3 Step S4 involves introducing high-pressure gas into either the inlet section 12 or the outlet section 13 to clean the powder within the branch flow channel to be cleaned. Specifically, high-pressure gas is introduced into the inlet section 12, and after passing through the branch flow channel to be cleaned, it is ejected from the outlet section 13; alternatively, high-pressure gas is introduced into the outlet section 13, and after passing through the branch flow channel to be cleaned, it is ejected from the inlet section 12. The branch flow channel to be cleaned is, for example, the first branch flow channel 141. Figure 3The image uses multiple arrows to illustrate the flow path of the high-pressure gas. Figure 3 As shown, high-pressure gas flows sequentially through inlet section 12, first branch channel 141, and outlet section 13, forming a stable airflow channel. This allows the high-pressure gas to effectively remove powder from the branch channel. Further, the method of introducing high-pressure gas into inlet section 12 or outlet section 13 includes: sealing inlet section 12 or outlet section 13 with plug 3, and then injecting high-pressure gas into inlet section 12 or outlet section 13 through nozzle 4 passing through plug 3. The outer end of nozzle 4 is connected to a high-pressure gas source. Using plug 3 and nozzle 4 to introduce high-pressure gas into inlet section 12 or outlet section 13 prevents the introduced high-pressure gas from escaping from the inlet end, increasing the gas flow rate and pressure within the channel cavity. High-pressure gas includes high-pressure air or high-pressure nitrogen, and its pressure is greater than atmospheric pressure.

[0061] Finally, refer to Figure 4 Step S5: Repeat steps S3 and S4 above until all powder in the branch channels is removed. For example, the branch channel to be cleaned is identified as the second branch channel 142. Then, the first branch channel 141 is blocked by the plunger 2, and high-pressure gas is introduced into the inlet section 12 or the outlet section 13 to clean the powder in the second branch channel 142. Figure 4 The image also uses multiple arrows to illustrate the flow path of the high-pressure gas, according to... Figure 4 As shown, high-pressure gas flows sequentially through inlet section 12, second branch channel 142, and outlet section 13, forming a stable airflow channel. This allows the high-pressure gas to effectively remove powder from the second branch channel 142. While cleaning each branch channel, the high-pressure gas also flows through inlet section 12 and outlet section 13, thus simultaneously cleaning the powder in both sections. After cleaning each branch channel, the powder cleaning of the entire additive manufacturing part 1 is completed.

[0062] Reference Figure 5 In this embodiment, after the powder cleaning of the additive part 1 is completed, the step may further include: filling and sealing the process hole 15 with a metal rod 5. Specifically, a metal rod 5 with a shape and size matching the process hole 15 is inserted into the process hole 15. The metal rod 5 is, for example, a copper rod. Then, a weld point 6 is made at the outlet end of the process hole 15, and the weld point 6 welds and fixes the metal rod 5 in the process hole 15. Filling and sealing the process hole 15 with a metal rod 5 can prevent the cooling medium from accumulating in the process hole 15 and forming an unexpected heat point or temperature gradient during the use of the additive part 1, which would affect the flow of the cooling medium and the cooling effect.

[0063] After completing the above steps, conventional post-processing procedures such as heat treatment and machining can be performed on the additive part 1, which will not be elaborated here.

[0064] In actual processes, after the additive part 1 is cleaned of powder using the above method, the amount of powder in the branch flow channel of the additive part 1 is greatly reduced, for example, by 70% to 90%. Therefore, the problems of flow channel blockage and scrapping of additive part 1 caused by residual powder caking during post-processing are effectively avoided.

[0065] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. An additively manufactured piece (1) comprising a piece body (11) provided internally with a flow channel cavity for accommodating a cooling medium, characterized in that: The flow channel cavity includes an inlet section (12), a branch section (14), and an outlet section (13) arranged sequentially along the flow direction of the cooling medium. The branch section (14) includes multiple branch flow channels connected in parallel between the inlet section (12) and the outlet section (13). Each branch flow channel is connected to a process hole (15) from the side. The outlet end of the process hole (15) extends to the surface of the main body (11) of the part. The process hole (15) is configured to block the branch flow channels connected to it by inserting a cylindrical plug (2) therein.

2. The additively manufactured piece (1) according to claim 1, characterized in that: The process hole (15) is a straight hole.

3. The additive manufacturing part (1) according to claim 2, characterized in that: The extension direction of the process hole (15) is perpendicular to the flow direction at the connection between the process hole (15) and the branch flow channel.

4. The additive manufacturing part (1) according to claim 1, characterized in that: The inner diameter of the process hole (15) is greater than or equal to the inner diameter of the branch channel connected to the process hole (15).

5. A powder cleaning method for additively manufactured parts, characterized in that, Including the following steps: (a) Providing an additively manufactured part (1) as described in any one of claims 1 to 4; (b) Insert cylindrical plugs (2) into each process hole (15) to seal the outlet end of each process hole (15); (c) Identify a branch channel to be cleaned and seal the remaining branch channels with the cylindrical plug (2); (d) High-pressure gas is introduced into the inlet section (12) or the outlet section (13) to clean the powder in the branch channel to be cleaned; (e) Repeat steps (c) and (d) above until all powder in the branch channels is removed.

6. The powder cleaning method for additively manufactured parts according to claim 5, characterized in that, The method of introducing high-pressure gas into the inlet section (12) or the outlet section (13) includes: sealing the inlet section (12) or the outlet section (13) with a plug (3), and then injecting high-pressure gas into the inlet section (12) or the outlet section (13) through a nozzle (4) passing through the plug (3).

7. The powder cleaning method for additively manufactured parts according to claim 5, characterized in that, After performing step (e), the process hole (15) is further included: filling and sealing the process hole (15) with a metal rod (5).

8. The powder cleaning method for additively manufactured parts according to claim 5, characterized in that, The length of the plunger (2) is greater than the length of the process hole (15) into which the plunger (2) is inserted.

9. The powder cleaning method for additively manufactured parts according to claim 5, characterized in that: The cylindrical plug (2) is made of an elastic material.

10. The powder cleaning method for additively manufactured parts according to claim 5, characterized in that: The end of the cylindrical plug (2) is round.

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