A fusion reactor antenna radiation belt and its SLM molding method

Abstract

The present invention relates to the technical field of powder metallurgy, and discloses a fusion reactor antenna radiation belt and a SLM molding method thereof. By establishing a target three-dimensional model, the cooling flow channels and the connecting flow channels are arranged throughout the body of the fusion reactor antenna radiation belt, and by continuously twisting the cooling flow channels along their own axes, the possibility of collapse of the upper wall of the cooling flow channel due to lack of support is reduced during SLM molding, the porosity is reduced, and the rigidity of the structure is improved. The suspended outer wall of the fusion reactor antenna radiation belt is then supported by external supports to avoid collapse of the overall structure. Then, the target fusion reactor antenna radiation belt is obtained by slicing and cutting the external supports using SLM process production equipment, and post-processing is performed.

Description

Technical Field

[0001] The present invention relates to the technical field of powder metallurgy, and in particular to a fusion reactor antenna radiation belt and a SLM molding method thereof. Background Art

[0002] In thermonuclear fusion devices, nuclear fusion primarily occurs when two lighter atomic nuclei combine to form a heavier nucleus, releasing enormous amounts of energy. To achieve and maintain the extreme plasma conditions required for fusion reactions, high-power, high-energy radio frequency (RF) radiation is injected into the plasma via an antenna to effectively raise the plasma temperature. However, because high-temperature plasma can radiate megawatt-level heat loads on the antenna for extended periods, internal cooling channels must be designed and actively used to cool the antenna. This keeps the antenna temperature within a certain range to ensure proper operation.

[0003] Due to the antenna band's small thickness, complex contours, and high precision requirements, traditional CNC machining or cover plate welding methods cannot meet the weld quality and pressure-bearing requirements required for internal fusion components in nuclear fusion devices. To improve forming precision, laser fusion molding (SLM) is now commonly used to process antenna bands. SLM is a molding method that rapidly melts metal powder under the influence of a high-energy laser beam and rapidly cools and solidifies it. It can produce solid parts of any complex shape based on a three-dimensional digital model of the part, making it suitable for manufacturing parts with complex internal cavities.

[0004] In order to enable the cooling medium to fully cool the antenna radiation belt, the internal cooling channel in the antenna radiation belt is extended along the overall shape of the antenna radiation belt. At least part of the upper wall of the internal cooling channel will be in a suspended state during molding, which is prone to collapse, and it is difficult to set supports in the internal cooling channel to support the upper wall to prevent collapse; in addition, the porosity of the SLM molding process is large, which is easy to affect the overall strength of the antenna radiation belt. Summary of the Invention

[0005] The purpose of the present invention is to provide a fusion reactor antenna radiation belt and an SLM molding method thereof, so as to solve the problem in the prior art that the fusion reactor antenna radiation belt is prone to collapse and has a large porosity when formed by SLM.

[0006] To achieve the above-mentioned object, the present invention provides a SLM molding method for a fusion reactor antenna radiation belt, which comprises the following steps:

[0007] S1. Establishing a target three-dimensional model, wherein the target three-dimensional model includes a connected fusion reactor antenna radiation belt body and an external support;

[0008] The fusion reactor antenna radiation belt body includes a bent portion and a connecting portion connected to each other; the bent portion is bent, and the connecting portion is horizontally extended;

[0009] The bent portion is provided with n groups of cooling channels, the n groups of cooling channels being spaced apart and arranged in parallel along a first direction, where n is an even number greater than 2; each group of cooling channels includes m cooling channels; the cooling channels are extended along the bending direction of the bent portion and twisted along their own axial direction; the cooling channels penetrate the outer surfaces of both ends of the bent portion in the extending direction;

[0010] The connecting portion is provided with 0.5*n groups of connecting flow channels, each group of connecting flow channels includes m connecting flow channels, and both ends of the connecting flow channels penetrate the outer surface of the same end of the connecting portion, so that any group of cooling flow channels is connected to another group of cooling flow channels through one group of the connecting flow channels;

[0011] The cross-sections of the cooling channel and the connecting channel are both Lurock triangles;

[0012] Wherein, the first direction is the width direction of the fusion reactor antenna radiation belt body;

[0013] S2. Importing the target three-dimensional model into an SLM process production device for slicing and production; cutting the outer support and performing post-processing to obtain the target fusion reactor antenna radiation belt.

[0014] Furthermore, in S2, the target three-dimensional model is imported into an SLM process production device for slicing and production, specifically:

[0015] The target three-dimensional model is imported into the SLM process production equipment for slicing and production. The molding process parameters of the SLM process production equipment are: laser power of 200~500W; scanning speed of 500~2000mm / s; scanning spacing of 0.1~0.2mm; layer thickness of 0.01~0.05mm; oxygen content in the molding chamber ≤1000ppm.

[0016] Furthermore, in step S1, n groups of cooling channels are provided in the bending portion, and the n groups of cooling channels are arranged in parallel and spaced apart along the first direction, where n is an even number greater than 2; each group of cooling channels includes m cooling channels, specifically:

[0017] n groups of cooling channels are arranged in parallel and spaced apart along the first direction, where n is an even number greater than 2; each group of cooling channels includes seven cooling channels, and one of the cooling channels is evenly spaced apart around another six cooling channels;

[0018] The distance between two adjacent cooling channels is greater than or equal to 1.5 mm, and the distance between the cooling channel and the outer surface of the fusion reactor antenna radiation belt body is greater than or equal to 5 mm.

[0019] Furthermore, in step S1, the cooling channel is extended along the bending direction of the bending portion and twisted along its own axial direction, specifically:

[0020] In step S1, the cooling channel is extended along the bending direction of the bending portion and twisted along its own axial direction, with a twisting pitch of 20 to 60 mm.

[0021] Furthermore, the cross-sections of the cooling channel and the connecting channel in step S1 are both Lurox triangles, specifically:

[0022] The hydraulic diameter of the Lurox triangle is less than 8 mm, and the radius r of the tip fillet of the Lurox triangle satisfies r≥max(0.2 mm, 2d);

[0023] Where d is the laser spot diameter of the SLM process production equipment.

[0024] Furthermore, in step S2, the target three-dimensional model is introduced into an SLM process production device for slicing and production; the outer support is cut and post-processed to obtain the target fusion reactor antenna radiation belt, specifically including:

[0025] S2-1, importing the target three-dimensional model into the SLM process production equipment for slicing and production to obtain a first blank;

[0026] S2-2, heat treating the first blank to obtain a second blank;

[0027] S2-3, cutting the outer support of the second blank to obtain a third blank;

[0028] S2-4. Post-process the third blank to obtain a target fusion reactor antenna radiation belt.

[0029] Furthermore, in step S2-2, heat treating the first blank to obtain a second blank specifically includes:

[0030] The first blank is placed in a vacuum furnace or an atmosphere furnace, and the temperature of the first blank is raised to 600-1100° C. for annealing, and the temperature is kept for 2-4 hours;

[0031] Finally, the first blank is cooled to room temperature in the furnace to obtain the second blank.

[0032] Furthermore, in step S2-4, post-processing the third blank to obtain a target fusion reactor antenna radiation belt specifically includes:

[0033] performing sandblasting on the outer surface of the third blank;

[0034] Among them, the abrasive is set to brown corundum medium, the compressed air pressure is set to 0.4~0.8MPa, and the sand blowing distance is set to 200±50mm.

[0035] Furthermore, it also includes:

[0036] S3. Performing nondestructive testing on the target fusion reactor antenna radiation belt. If the testing standard is not met, the target fusion reactor antenna radiation belt is scrapped.

[0037] Among them, X-ray testing is used for non-destructive testing; the testing standard requires that the maximum size of a single defect is ≤1.5mm or does not exceed 1 / 3 of the wall thickness; and no unfused or through-going cracks are allowed in the radiation belt of the target fusion reactor antenna;

[0038] S4. Performing a pressure test on the target fusion reactor antenna radiation belt. If the pressure test standard is not met, the target fusion reactor antenna radiation belt is scrapped.

[0039] The target fusion reactor antenna radiation belt is placed under a pressure of 7.5 MPa for a pressure test, and the pressure holding time is greater than or equal to 30 minutes; the pressure test standard requires a vacuum leak rate of ≤1×10 -10 Pa·m³ / s.

[0040] The present invention also provides a fusion reactor antenna radiation belt, which is manufactured by the above-mentioned SLM molding method of the fusion reactor antenna radiation belt.

[0041] Compared with the prior art, the fusion reactor antenna radiation belt and SLM molding method provided by the present invention have the following advantages:

[0042] The present invention provides a SLM molding method for a fusion reactor antenna radiation belt, which connects any one group of cooling channels with another group of cooling channels through a group of connecting channels, and the cooling channels are extended along the bending direction of the bending portion, so that the cooling channels and connecting channels are arranged throughout the fusion reactor antenna radiation belt body, so that the fusion reactor antenna radiation belt body can achieve heat dissipation through the cooling channels and connecting channels; and by continuously twisting the cooling channels along their own axes, the possibility of collapse of the upper wall of the cooling channels that lacks support is reduced during SLM molding, and the porosity is reduced through the design of the continuously twisted channel structure to improve the rigidity of the structure; the suspended outer surface of the fusion reactor antenna radiation belt body is supported by external supports to avoid collapse of the overall structure; and then the target fusion reactor antenna radiation belt is obtained by slicing and cutting with SLM process production equipment, removing the external supports, and performing post-processing. In addition, the twisting design of the cooling channel can form a spiral disturbance in the cooling medium in the cooling channel of the fusion reactor antenna radiation belt manufactured by the above-mentioned SLM molding method of the fusion reactor antenna radiation belt, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic flow chart of a SLM molding method for a fusion reactor antenna radiation belt according to an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the three-dimensional structure of a fusion reactor antenna radiation belt body according to an embodiment of the present invention;

[0045] Figure 3 This is a schematic cross-sectional structural diagram of a cooling channel of a fusion reactor antenna radiation belt body according to an embodiment of the present invention;

[0046] Figure 4 This is a schematic side cross-sectional view of a fusion reactor antenna radiation belt body according to an embodiment of the present invention;

[0047] Figure 5 This is a side view schematic diagram of a fusion reactor antenna radiation belt body according to an embodiment of the present invention;

[0048] Figure 6 yes Figure 5 Schematic diagram of the AA section.

[0049] In the figure, 100 is the fusion reactor antenna radiation belt body; 1 is the bending part; 2 is the connecting part; 101 is the cooling flow channel; 102 is the connecting flow channel. DETAILED DESCRIPTION

[0050] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0051] In the description of the present invention, it should be understood that the term "SLM process production equipment" used in the present invention is a prior art, and different types of equipment can be selected according to actual needs, which will not be described here.

[0052] like Figures 1 to 6 As shown, an SLM molding method for a fusion reactor antenna radiation belt according to an embodiment of the present invention includes the following steps:

[0053] S1. Establishing a target three-dimensional model, wherein the target three-dimensional model includes a connected fusion reactor antenna radiation belt body 100 and an external support;

[0054] The fusion reactor antenna radiation belt body 100 includes a bent portion 1 and a connecting portion 2 connected to each other; the bent portion 1 is bent, and the connecting portion 2 is horizontally extended;

[0055] The bending portion 1 is provided with n groups of cooling channels 101, which are spaced apart and arranged in parallel along a first direction X, where n is an even number greater than 2; each group of cooling channels 101 includes m cooling channels 101; the cooling channels 101 extend along the bending direction of the bending portion 1 and are twisted along their own axial direction; the cooling channels 101 penetrate the outer surfaces of both ends of the bending portion 1 in the extending direction;

[0056] The connecting portion 2 is provided with 0.5*n groups of connecting flow channels 102, each group of connecting flow channels 102 includes m connecting flow channels 102, and both ends of the connecting flow channels 102 pass through the outer surface of the same end of the connecting portion 2, so that any group of cooling flow channels 101 is connected to another group of cooling flow channels 101 through a group of connecting flow channels 102;

[0057] The cross-sections of the cooling channel 101 and the connecting channel 102 are both Lurox triangles;

[0058] The first direction X is the width direction of the fusion reactor antenna radiation belt body 100;

[0059] S2. Importing the target three-dimensional model into an SLM process production device for slicing and production; cutting the outer support and performing post-processing to obtain the target fusion reactor antenna radiation belt.

[0060] Based on the above technical solution, any group of cooling channels 101 is connected to another group of cooling channels 101 through a group of the connecting channels, and the cooling channels 101 are extended along the bending direction of the bending portion 1, so that the cooling channels 101 and the connecting channels 102 are arranged throughout the fusion reactor antenna radiation belt body 100, so that the fusion reactor antenna radiation belt body 100 can achieve heat dissipation through the cooling channels 101 and the connecting channels 102; and by continuously twisting the cooling channels 101 along their own axial direction, the possibility of collapse of the upper wall of the cooling channels 101 that lacks support is reduced during SLM molding, and the porosity is reduced by the continuously twisted channel structure design to improve the rigidity of the structure; the suspended outer surface of the fusion reactor antenna radiation belt body 100 is supported by external supports to avoid collapse of the overall structure; and then the SLM process production equipment is used to slice and cut to remove the external supports and perform post-processing to obtain the target fusion reactor antenna radiation belt. In addition, the twisted design of the cooling channel 101 can cause the cooling medium to form a spiral disturbance in the cooling channel 101, thereby improving heat exchange efficiency.

[0061] Preferably, if Figure 3 As shown, eight groups of cooling channels are provided in the bending portion, and the eight groups of cooling channels 101 are arranged in parallel and at intervals along the first direction X. The eight groups of cooling channels 101 are provided to improve the heat exchange and heat dissipation efficiency.

[0062] Preferably, in the molding direction, the suspended outer surfaces of the fusion reactor antenna radiation belt body are all connected to the external support;

[0063] It can be understood that the forming direction refers to the moving direction of the base plate in the SLM process production equipment. The SLM process forms parts by continuously moving the base plate downward to melt and quickly cool and solidify metal powder layer by layer. Therefore, the outer surface of the part suspended in the forming direction needs to be supported by external supports to prevent collapse during the forming process.

[0064] Furthermore, in order to specifically implement the production and preparation of the first blank by the SLM process production equipment, the target three-dimensional model is imported into the SLM process production equipment for slicing and production in S2, specifically:

[0065] The target three-dimensional model is imported into the SLM process production equipment for slicing and production. The molding process parameters of the SLM process production equipment are: laser power of 200~500W; scanning speed of 500~2000mm / s; scanning spacing of 0.1~0.2mm; layer thickness of 0.01~0.05mm; oxygen content in the molding chamber ≤1000ppm.

[0066] Furthermore, if Figure 3As shown, in order to enhance the structural strength of each group of cooling channels 101, n groups of cooling channels are opened in the bending portion in step S1, and the n groups of cooling channels are arranged in parallel along the first direction, where n is an even number greater than 2; each group of cooling channels includes m cooling channels, specifically:

[0067] The n groups of cooling channels are arranged in parallel at intervals along the first direction, where n is an even number greater than 2; each group of cooling channels includes seven cooling channels, one of which is evenly spaced around another six cooling channels; so that the cross-section of each group of cooling channels 101 is arranged in a honeycomb shape.

[0068] The distance between two adjacent cooling channels is greater than or equal to 1.5 mm, and the distance between the cooling channel and the outer surface of the fusion reactor antenna radiation belt body is greater than or equal to 5 mm, so as to meet the pressure requirements of the fusion reactor antenna radiation belt.

[0069] Furthermore, if Figure 4 As shown, since the torsional pitch of the cooling channel is negatively correlated with the fluid pressure loss, that is, the larger the torsional pitch, the smaller the fluid pressure loss; in step S1, the cooling channel is extended along the bending direction of the bending portion and twisted along its own axial direction, specifically:

[0070] In step S1, the cooling channel is extended along the bending direction of the bent portion and twisted along its own axial direction, with a twist pitch of 20 to 60 mm. If the twist pitch is too large, the possibility of collapse of the upper wall of the cooling channel will increase. If the twist pitch is too small, the fluid pressure loss will be too large, affecting the flow effect of the cooling medium in the cooling channel.

[0071] Furthermore, if Figure 3 As shown, in order to specifically limit the diameter of the cooling channel, the cross-sections of the cooling channel and the connecting channel in step S1 are both Lurox triangles, specifically:

[0072] The hydraulic diameter of the Lurox triangle is less than 8 mm, and the radius r of the tip fillet of the Lurox triangle satisfies r≥max(0.2 mm, 2d);

[0073] Where d is the laser spot diameter of the SLM process production equipment.

[0074] Furthermore, to standardize the process flow of slicing and producing the resulting product into the target fusion reactor antenna radiation belt in the SLM process production equipment;

[0075] In step S2, the target three-dimensional model is introduced into an SLM process production device for slicing and production; the outer support is cut and post-processed to obtain the target fusion reactor antenna radiation belt, specifically including:

[0076] S2-1, importing the target three-dimensional model into the SLM process production equipment for slicing and production to obtain a first blank;

[0077] S2-2, heat treating the first blank to obtain a second blank;

[0078] S2-3, cutting the outer support of the second blank to obtain a third blank;

[0079] S2-4. Post-process the third blank to obtain a target fusion reactor antenna radiation belt.

[0080] Furthermore, in order to specifically implement the heat treatment of the first blank, the step S2-2 of heat treating the first blank to obtain the second blank specifically includes:

[0081] The first blank is placed in a vacuum furnace or an atmosphere furnace, and the temperature of the first blank is raised to 600-1100° C. for annealing, and the temperature is kept for 2-4 hours;

[0082] Finally, the first blank is cooled to room temperature in the furnace to obtain the second blank.

[0083] Furthermore, in order to specifically implement the post-processing of the third blank, the step S2-4 of post-processing the third blank to obtain the target fusion reactor antenna radiation belt specifically includes:

[0084] performing sandblasting on the outer surface of the third blank;

[0085] Among them, the abrasive is set to brown corundum medium, the compressed air pressure is set to 0.4~0.8MPa, and the sand blowing distance is set to 200±50mm.

[0086] Preferably, in order to improve the precision of the peripheral walls of the cooling channel 101 and the connecting channel 102, the step S2-4 further comprises: performing post-processing on the third blank to obtain the target fusion reactor antenna radiation belt.

[0087] The peripheral walls of the cooling channel 101 and the connecting channel 102 are subjected to electrochemical polishing or magnetic fluid polishing.

[0088] Furthermore, in order to ensure that the target fusion reactor antenna radiation belt meets the required porosity requirements and can withstand the high-pressure environment in the fusion reactor, the SLM molding method of the fusion reactor antenna radiation belt 100 further includes:

[0089] S3. Performing nondestructive testing on the target fusion reactor antenna radiation belt. If the testing standard is not met, the target fusion reactor antenna radiation belt is scrapped.

[0090] Among them, X-ray testing is used for non-destructive testing; the testing standard requires that the maximum size of a single defect is ≤1.5mm or not more than 1 / 3 of the wall thickness; and no unfused or through cracks are allowed in the radiation belt of the target fusion reactor antenna.

[0091] Furthermore, to ensure that the target fusion reactor antenna radiation belt can withstand the high-pressure environment in the fusion reactor, the SLM molding method of the fusion reactor antenna radiation belt 100 further includes:

[0092] S4. Performing a pressure test on the target fusion reactor antenna radiation belt. If the pressure test standard is not met, the target fusion reactor antenna radiation belt is scrapped.

[0093] The target fusion reactor antenna radiation belt is placed under a pressure of 7.5 MPa for a pressure holding test, with a pressure holding time of greater than or equal to 30 minutes; the pressure test standard requires a vacuum leak rate of ≤1×10-10Pa·m³ / s.

[0094] The present invention also provides a fusion reactor antenna radiation belt 100, which is manufactured by the above-mentioned SLM molding method of the fusion reactor antenna radiation belt; the cooling flow channel in the fusion reactor antenna radiation belt 100 is twisted, so that the fusion reactor antenna radiation belt 100 has a higher heat exchange efficiency.

[0095] Example 1

[0096] S1. Using 3D modeling software to establish a target 3D model of a fusion reactor antenna radiation belt, wherein the target 3D model includes a fusion reactor antenna radiation belt body 100 and an external support;

[0097] The fusion reactor antenna radiation belt body 100 includes a bent portion 1 and a connecting portion 2 connected to each other; the bent portion 1 is bent, and the connecting portion 2 is horizontally extended;

[0098] Specifically, the thickness of the initial three-dimensional model is 25 mm, and the width (i.e., the dimension in the first direction) is 180 mm;

[0099] The bending portion 1 is provided with eight groups of cooling channels 101, which are arranged in parallel and spaced apart along a first direction X; each group of cooling channels 101 includes seven cooling channels 101; the cooling channels 101 extend along the bending direction of the bending portion 1 and are twisted along their own axial direction; the cooling channels 101 penetrate the outer surfaces of both ends of the bending portion 1 in the extending direction;

[0100] The connecting portion 2 is provided with four groups of connecting flow channels 102, each group of connecting flow channels 102 includes seven connecting flow channels 102, and both ends of the connecting flow channels 102 pass through the outer surface of the same end of the connecting portion 2, so that any group of cooling flow channels 101 is connected to another group of cooling flow channels 101 through a group of connecting flow channels 102;

[0101] like Figures 3 to 6 As shown, along the first direction X, the eight groups of cooling channels are sequentially cooling channel A, cooling channel B, cooling channel C, cooling channel D, cooling channel E, cooling channel F, cooling channel G, and cooling channel H; along the first direction, the four groups of connecting channels are sequentially connecting channel a, connecting channel b, connecting channel c, and connecting channel d;

[0102] Cooling channel A and cooling channel H are connected through a connecting channel a, cooling channel B and cooling channel G are connected through a connecting channel b, cooling channel C and cooling channel F are connected through a connecting channel c, and cooling channel D and cooling channel E are connected through a connecting channel d to form an intermediate three-dimensional model;

[0103] The cross-sections of the cooling channel 101 and the connecting channel 102 are both Lurox triangles;

[0104] The hydraulic diameter of the Lurox triangle is selected to be 5 mm; and the tip fillet radius r of the Lurox triangle satisfies r≥max(0.2 mm, 2d); d is the laser spot diameter of the SLM process production equipment.

[0105] To facilitate the determination of the positional arrangement of the cooling channels in each group, the coordinates of the cooling channel located at the center of each group are (12.5, X), where "12.5" corresponds to the distance in the thickness direction, and "X" corresponds to the distance in the width direction. The remaining six cooling channels are spaced greater than 6.5 mm from the central cooling channel, and the spacing is kept consistent. The cooling channel is spaced greater than 5 mm from the outer wall of the fusion reactor antenna radiation belt.

[0106] In the molding direction, the suspended outer surfaces of the fusion reactor antenna radiation belt body 100 are all connected to the outer support;

[0107] The first direction X is the width direction of the fusion reactor antenna radiation belt body 100;

[0108] S2-1, importing the target three-dimensional model into the SLM process production equipment for slicing and production;

[0109] Among them, SS316L powder is selected as the molding material, and the powder diameter is selected from 10~100um. The chemical composition and particle size of the powder are tested before spreading.

[0110] The SLM process production equipment is used for printing. The molding process parameters of the SLM process production equipment are: laser power is selected as 400W; scanning speed is 800mm / s; scanning spacing is 0.15mm; layer thickness is 0.02mm; oxygen content in the molding chamber is 800ppm;

[0111] Cleaning the powder and cutting the molded product from the base plate of the SLM process production equipment by wire cutting;

[0112] To obtain a first blank;

[0113] S2-2, heat treating the first blank,

[0114] Among them, the heat treatment process is:

[0115] The first blank is placed in a vacuum furnace and the vacuum degree of the vacuum furnace is controlled at 10 -4 Pa, heating the first blank to 600°C for annealing and keeping the temperature for 3 hours; finally, cooling the first blank to room temperature;

[0116] To obtain a second blank;

[0117] S2-3, cutting the outer support of the second blank to obtain a third blank;

[0118] S2-4, post-processing the third blank,

[0119] Among them, the post-processing process is:

[0120] performing sandblasting on the outer surface of the third blank;

[0121] Among them, the abrasive is set to brown corundum medium, the compressed air pressure is set to 0.4~0.8MPa, and the sand blowing distance is set to 200±50mm;

[0122] Get the target fusion reactor antenna radiation belt.

[0123] S3. Performing nondestructive testing on the target fusion reactor antenna radiation belt. If the testing standard is not met, the target fusion reactor antenna radiation belt is scrapped.

[0124] Among them, X-ray testing is used for non-destructive testing; the testing standard requires that the maximum size of a single defect is ≤1.5mm or not more than 1 / 3 of the wall thickness; and no unfused or through cracks are allowed in the radiation belt of the target fusion reactor antenna.

[0125] In this embodiment, before X-ray inspection, a fluorescent penetrant test is first used to detect whether the surface of the target fusion reactor antenna radiation belt has cracks. If cracks are found, the antenna is directly scrapped. If no cracks are found, an X-ray inspection of the internal structure is performed.

[0126] S4. Performing a pressure test on the target fusion reactor antenna radiation belt. If the pressure test standard is not met, the target fusion reactor antenna radiation belt is scrapped.

[0127] The target fusion reactor antenna radiation belt is placed under a pressure of 7.5 MPa for a pressure holding test, with a pressure holding time of greater than or equal to 30 minutes; the pressure test standard requires a vacuum leak rate of ≤1×10-10Pa·m³ / s.

[0128] Finally, the target fusion reactor antenna radiation belt is subjected to a dimensional accuracy test. If the dimensional accuracy reaches ±0.1 mm, it is considered qualified and the target fusion reactor antenna radiation belt is stored.

[0129] In summary, an embodiment of the present invention provides an SLM molding method for a fusion reactor antenna radiation belt, which connects any one group of cooling channels 101 with another group of cooling channels 101 through a group of connecting channels, and the cooling channels 101 are extended along the bending direction of the bending portion 1, so that the cooling channels 101 and the connecting channels 102 are arranged throughout the fusion reactor antenna radiation belt body 100, so that the fusion reactor antenna radiation belt body 100 can achieve heat dissipation through the cooling channels 101 and the connecting channels 102; and by making the cooling channels 101 along its own axial direction Continuous twisting reduces the possibility of collapse of the unsupported upper wall of the cooling channel 101 during SLM molding. The continuously twisted channel structure design reduces porosity, thereby improving structural rigidity. External supports are then used to support the suspended outer surface of the fusion reactor antenna radiation belt body 100 to prevent collapse of the overall structure. The first blank is then sliced ​​using SLM production equipment, followed by heat treatment to obtain the second blank, and then cutting to remove the external supports to obtain the third blank. Finally, post-processing yields the target fusion reactor antenna radiation belt. Furthermore, the twisting design of the cooling channel 101 creates a spiral disturbance in the cooling medium within the cooling channel 101, thereby improving heat exchange efficiency.

[0130] The present invention also provides a fusion reactor antenna radiation belt, which is manufactured by the above-mentioned SLM molding method of the fusion reactor antenna radiation belt; the cooling flow channel in the fusion reactor antenna radiation belt 100 is twisted, so that the fusion reactor antenna radiation belt 100 has a higher heat exchange efficiency.

[0131] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A SLM molding method for a fusion reactor antenna radiation belt, characterized in that: The following steps are involved: S1. Establishing a target three-dimensional model, wherein the target three-dimensional model includes a connected fusion reactor antenna radiation belt body and an external support; The fusion reactor antenna radiation belt body includes a bent portion and a connecting portion connected to each other; the bent portion is bent, and the connecting portion is horizontally extended; The bent portion is provided with n groups of cooling channels, the n groups of cooling channels being spaced apart and arranged in parallel along a first direction, where n is an even number greater than 2; each group of cooling channels includes m cooling channels; the cooling channels are extended along the bending direction of the bent portion and twisted along their own axial direction; the cooling channels penetrate the outer surfaces of both ends of the bent portion in the extending direction; The connecting portion is provided with 0.5*n groups of connecting flow channels, each group of connecting flow channels includes m connecting flow channels, and both ends of the connecting flow channels penetrate the outer surface of the same end of the connecting portion, so that any group of cooling flow channels is connected to another group of cooling flow channels through one group of the connecting flow channels; The cross-sections of the cooling channel and the connecting channel are both Lurock triangles; Wherein, the first direction is the width direction of the fusion reactor antenna radiation belt body; S2. Importing the target three-dimensional model into an SLM process production device for slicing and production; cutting the outer support and performing post-processing to obtain the target fusion reactor antenna radiation belt.

2. The SLM molding method for a fusion reactor antenna radiation belt according to claim 1, characterized in that: In S2, the target three-dimensional model is imported into the SLM process production equipment for slicing and production, specifically: The molding process parameters of the SLM process production equipment are: laser power of 200~500W; scanning speed of 500~2000mm / s; scanning spacing of 0.1~0.2mm; The layer thickness is 0.01~0.05mm; the oxygen content in the forming chamber is ≤1000ppm.

3. The SLM molding method for a fusion reactor antenna radiation belt according to claim 1, characterized in that: In step S1, n groups of cooling channels are provided in the bending portion, and the n groups of cooling channels are arranged in parallel and spaced apart along the first direction, where n is an even number greater than 2; each group of cooling channels includes m cooling channels, specifically: n groups of cooling channels are arranged in parallel and spaced apart along the first direction, where n is an even number greater than 2; each group of cooling channels includes seven cooling channels, and one of the cooling channels is evenly spaced apart around another six cooling channels; The distance between two adjacent cooling channels is greater than or equal to 1.5 mm, and the distance between the cooling channel and the outer surface of the fusion reactor antenna radiation belt body is greater than or equal to 5 mm.

4. The SLM molding method for a fusion reactor antenna radiation belt according to claim 1, characterized in that: In step S1, the cooling channel is extended along the bending direction of the bending portion and twisted along its own axial direction, specifically: In step S1, the cooling channel is extended along the bending direction of the bending portion and twisted along its own axial direction, with a twisting pitch of 20 to 60 mm.

5. The SLM molding method for a fusion reactor antenna radiation belt according to claim 1, characterized in that: The cross-sections of the cooling channel and the connecting channel in step S1 are both Lurox triangles, specifically: The hydraulic diameter of the Lurox triangle is less than 8 mm, and the radius r of the tip fillet of the Lurox triangle satisfies r≥max(0.2 mm, 2d); Where d is the laser spot diameter of the SLM process production equipment.

6. The SLM molding method for a fusion reactor antenna radiation belt according to claim 1, characterized in that: In step S2, the target three-dimensional model is imported into the SLM process production equipment for slicing and production; Cut the outer support and perform post-processing to obtain the target fusion reactor antenna radiation belt, including: S2-1, importing the target three-dimensional model into the SLM process production equipment for slicing and production to obtain a first blank; S2-2, heat treating the first blank to obtain a second blank; S2-3, cutting the outer support of the second blank to obtain a third blank; S2-4. Post-process the third blank to obtain a target fusion reactor antenna radiation belt.

7. The SLM molding method for a fusion reactor antenna radiation belt according to claim 6, characterized in that: The step S2-2 of heat treating the first blank to obtain a second blank specifically includes: The first blank is placed in a vacuum furnace or an atmosphere furnace, and the temperature of the first blank is raised to 600-1100° C. for annealing, and the temperature is kept for 2-4 hours; Finally, the first blank is cooled to room temperature in the furnace to obtain the second blank.

8. The SLM molding method for a fusion reactor antenna radiation belt according to claim 6, characterized in that: The step S2-4 of post-processing the third blank to obtain the target fusion reactor antenna radiation belt specifically includes: performing sandblasting on the outer surface of the third blank; Among them, the abrasive is set to brown corundum medium, the compressed air pressure is set to 0.4~0.8MPa, and the sand blowing distance is set to 200±50mm.

9. The SLM molding method for a fusion reactor antenna radiation belt according to claim 1, characterized in that: Also includes: S3. Performing nondestructive testing on the target fusion reactor antenna radiation belt. If the testing standard is not met, the target fusion reactor antenna radiation belt is scrapped. Among them, X-ray testing is used for non-destructive testing; the testing standard requires that the maximum size of a single defect is ≤1.5mm or does not exceed 1 / 3 of the wall thickness; and no unfused or through-going cracks are allowed in the radiation belt of the target fusion reactor antenna; S4. Performing a pressure test on the target fusion reactor antenna radiation belt. If the pressure test standard is not met, the target fusion reactor antenna radiation belt is scrapped. The target fusion reactor antenna radiation belt is placed under a pressure of 7.5 MPa for a pressure test, and the pressure holding time is greater than or equal to 30 minutes; the pressure test standard requires a vacuum leak rate of ≤1×10 -10 Pa·m³ / s.

10. A fusion reactor antenna radiation belt, characterized in that: It is manufactured by the SLM molding method of the fusion reactor antenna radiation belt according to any one of claims 1 to 9.

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