Manufacturing process of 1J22 alloy bar with high mechanical property and high magnetic property

Abstract

The invention discloses a manufacturing process of a 1J22 alloy bar with high mechanical performance and high magnetic performance, and belongs to the technical field of precision alloy material processing, the process comprises a rapid cooling treatment step, in the cooling stage after forging or hot rolling forming of the bar, the bar is cooled to be below 650 DEG C from the high temperature not lower than 900 DEG C at the cooling speed of at least 320 DEG C / h, and then the bar is cooled to be below 650 DEG C at the cooling speed of at least 320 DEG C / h; as a 1J22 bar has ordered-disordered transformation at 730 DEG C, in order to prevent brittleness after ordering at 730 DEG C, the bar needs to be quickly cooled within a specific temperature range to improve the brittleness of the material. Compared with the prior art, the 1J22 alloy bar produced on the basis of the technology can guarantee that the magnetic performance is superior to the national standard GB / T14986.3-2018, meanwhile, the mechanical performance is improved, the brittleness is improved, and the phenomena of tooth collapse, corner falling and cracking occurring in the machining process are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of precision alloy material processing, and in particular relates to a manufacturing process of a 1J22 alloy bar with high mechanical and magnetic properties. Background Art

[0002] As a typical high-performance soft magnetic material, 1J22 iron-cobalt-vanadium alloy, with its saturation magnetic induction intensity of up to 2.4T, is irreplaceable in high-end equipment such as precision electromagnetic devices, high-speed motor rotors, and special transformers. However, the alloy's inherent high brittleness severely restricts its industrial application. During machining (including turning, drilling, and slot milling), the material frequently experiences failures such as chipping, corner loss, and axial cracking. The scrap rate has long remained between 15-25%, significantly increasing manufacturing costs. In particular, edge chipping caused by brittleness is more prominent during high-precision thread machining and microstructure forming, directly affecting the consistency of the device's electromagnetic performance.

[0003] Current processes often employ a two-stage treatment approach: first, annealing is performed before machining to reduce the material's surface hardness. Subsequently, machining is performed by reducing the tool feed rate (30-50% of the conventional parameters) and combining it with a low cutting speed (line speed <15m / min). While this approach can improve machining performance to a limited extent, it suffers from three technical drawbacks: First, annealing degrades magnetic properties. Tests show a decrease in saturation magnetic flux density of approximately 8-12% and an increase in coercivity of 15-20%. Second, the additional heat treatment step extends the machining cycle by over 40% and increases energy costs by approximately 35%. Third, this passive reduction in machining efficiency increases the unit cost per man-hour by more than two-fold, and the suppression of brittle cracks is insufficient, resulting in a yield rate of less than 70% for complex structural parts.

[0004] The above process not only increases the cost and reduces the efficiency, but also still cannot fundamentally solve the problem of bar brittleness. How to solve the above technical problems has long troubled technicians in this field. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a production process for 1J22 alloy bars with high mechanical properties and high magnetic properties, adopting the following technical solutions: A process for producing a 1J22 alloy bar with high mechanical and magnetic properties, characterized by comprising a rapid cooling step, wherein: in a cooling stage after the bar is forged or hot-rolled, the bar is cooled from a high temperature of not less than 900°C to below 650°C at a cooling rate of at least 320°C / h.

[0006] Preferably, in the cold treatment step, the rod is cooled from a high temperature of 900° C. to 1000° C. to below 650° C. at a cooling rate of 320° C. / h to 350° C. / h.

[0007] Preferably, in the cold treatment step, the rod is cooled from a high temperature of not less than 1000°C to a temperature of 300°C to 650°C at a cooling rate of at least 350°C / h to 500°C / h.

[0008] Preferably, the following processing steps are further included before the rapid cooling step: (1) Vacuum melting: 1J22 alloy raw materials are prepared according to the chemical composition of 1J22 alloy bars, and the 1J22 alloy raw materials are placed in a vacuum induction furnace for vacuum melting. The vacuum induction furnace is used to vacuum deoxidize and decarburize the molten steel, and the molten steel is continuously purified. The vacuum degree of the vacuum induction furnace is ≤1.3Pa, and the heating temperature in the furnace is 1660-1750℃; (2) Pouring: vacuum casting the molten steel after vacuum melting; (4) Forging: The peeled and cleaned material is sent into a heating furnace and heated to 1250-1300℃, kept warm for 5-6 hours, and then forged into bars.

[0009] Preferably, the chemical composition of the 1J22 alloy bar comprises by weight: 47.50%≤Cobalt≤51.00%; 47.20%≤Iron≤50.20%; 0.80%≤vanadium≤2.10%; 0.04%≤alloying elements≤2.20%; 0%≤Carbon≤0.03%; The rest consists of unavoidable impurities from refining; The alloying elements include manganese, nickel, chromium and copper, wherein: 0.01%≤manganese≤0.10%, 0.01%≤nickel≤0.30%, 0.01%≤chromium≤0.80%, 0.01%≤copper≤1.00%.

[0010] Preferably, a cooling box with a temperature control function is used for the alloy bar to perform the rapid cooling treatment, wherein: Several fixing clamps for fixing the alloy rods are horizontally fixedly installed in the box body, and the fixing clamps are composed of a trapezoidal plate, a limiting cylinder and a limiting ring, and the limiting cylinders are provided with several and are all inserted into the trapezoidal plate, and the limiting rings are provided with several and are respectively fixedly sleeved on the several limiting cylinders, and a driving assembly for driving the alloy rod to rotate is fixedly installed on the box body and between the several fixing clamps, and the driving assembly is composed of a hydraulic cylinder and a push plate, and the push plate is fixedly installed on the piston rod of the hydraulic cylinder; a first ventilation window is provided on the lower side wall of the box body, and a second ventilation window is provided on the side wall of the box body, a first cooling fan is fixedly installed on the lower inner wall of the box body and on the inner side of the first ventilation window, a second cooling fan is fixedly installed on the side inner wall of the box body and on the inner side of the second ventilation window, a thermocouple is fixedly inserted on the side wall of the box body, and an upper cover is installed on the upper end of the box body; an infrared temperature measuring camera is fixedly installed on the inner wall of the upper cover.

[0011] Preferably, the trapezoidal plate on the fixing fixture is fixedly mounted on the inner wall of the box, and the trapezoidal plate is located between the first cooling fan and the second cooling fan at the same time; two ventilation slots are symmetrically opened on the trapezoidal plate on the fixing fixture, and a number of positioning holes are evenly opened on the trapezoidal plate and between the two ventilation slots, the positioning holes pass through the trapezoidal plate from top to bottom, the limiting cylinder is inserted into the positioning hole, and the limiting ring is located above the trapezoidal plate.

[0012] Preferably, the hydraulic cylinder on the driving assembly is fixedly mounted on the outer wall of the box, the piston rod of the hydraulic cylinder passes inward through the side wall of the box, the push plate is movably mounted between two adjacent fixing clamps, and the upper end of the push plate is provided with an anti-slip protrusion.

[0013] Preferably, the outer sides of the first ventilation window and the second ventilation window are connected to a liquid inert gas source through a sealing flange, a pipeline, a pressure reducing valve and a switch valve.

[0014] Preferably, the inert gas source is filled with liquid helium, and the argon gas input into the cooling box has a temperature of 8-15° C. and a pressure of 8-10 MPa.

[0015] A process for producing a 1J22 alloy with high mechanical and magnetic properties has the following beneficial effects: This process includes a rapid cooling step, in which the bar is cooled from a high temperature of no less than 900°C to below 650°C at a cooling rate of at least 320°C / h after forging or hot rolling. Because 1J22 bars undergo an order-disorder transition at 730°C, rapid cooling within a specific temperature range is necessary to prevent brittleness after ordering at 730°C. Compared with existing technologies, 1J22 alloy bars produced using this process can ensure magnetic properties superior to those in accordance with the national standard GB / T14986.3-2018, while also improving mechanical properties, reducing brittleness, and reducing tooth chipping, corner chipping, and cracking during machining.

[0016] The test data of the bars produced by this process are as follows: Hard state without heat treatment: yield strength ≥300MPa, tensile strength ≥320Mpa, elongation after fracture ≥5%.

[0017] A new cooling box is used, equipped with thermocouples and infrared temperature cameras. This allows real-time monitoring of the bar's temperature changes as it cools, as well as the temperature gradient along the bar's diameter to assess thermal stress. A heating element and exhaust fan are also installed within the box, allowing programmed temperature control. This box can also regulate the bar's cooling rate based on a temperature control curve.

[0018] In addition, by setting a fixing fixture consisting of a trapezoidal plate, a limiting cylinder and a limiting ring in the box, the alloy rod to be cooled can be placed on the upper end of the trapezoidal plate, and at the same time, it can be limited by the limiting cylinder. The contact area between the trapezoidal plate, the limiting cylinder and the alloy rod is small, which effectively reduces the contact thermal resistance, improves the heat dissipation efficiency, and enhances the air flow, ensuring uniform cooling of the rod surface and avoiding the uneven heat dissipation problem caused by the large contact area of the traditional fixture.

[0019] Finally, by setting a driving assembly consisting of a hydraulic cylinder and a push plate on the box, the driving assembly can drive the alloy rod placed on the fixed fixture to rotate, so that the alloy rod can dynamically adjust its position during the cooling process, ensuring that all parts of its surface are evenly contacted with the cooling airflow, significantly reducing the internal and external temperature difference and residual stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 This is a top view of the present invention after disassembly; Figure 2 It is a bottom view after disassembly of the present invention; Figure 3 It is a structural schematic diagram of the box body of the present invention; Figure 4This is a disassembled diagram of the fixing fixture of the present invention; Figure 5 Schematic diagram of the structure of the drive assembly of the present invention.

[0022] In the figure: 1. Box body; 2. Upper cover; 3. Fixing fixture; 4. Drive assembly; 5. First ventilation window; 6. Second ventilation window; 7. First cooling fan; 8. Second cooling fan; 9. Thermocouple; 10. Infrared temperature camera; 11. Trapezoidal plate; 12. Ventilation slot; 13. Positioning jack; 14. Limiting cylinder; 15. Limiting ring; 16. Hydraulic cylinder; 17. Push plate. DETAILED DESCRIPTION

[0023] The present invention will now be described in more detail, but not in a limiting sense, and will be illustrated by way of examples. In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0024] Example 1 The manufacturing process of the 1J22 alloy bar with high mechanical and magnetic properties includes a rapid cooling step, wherein: during the cooling stage of the bar after forging or hot rolling, the bar is cooled from a high temperature of not less than 900°C to below 650°C at a cooling rate of at least 320°C / h.

[0025] There are two solutions for reference in the specific implementation process: 1) In the cold treatment step, the bar is cooled from a high temperature of 900°C to 1000°C at a cooling rate of 320°C / h to 350°C / h to below 650°C.

[0026] 2) In the cooling step, the rod is cooled from a high temperature of not less than 1000°C to a temperature of 300°C to 650°C at a cooling rate of at least 350°C / h to 500°C / h.

[0027] It should be noted that the cooling method uses air cooling and water cooling cannot be used to avoid stress concentration.

[0028] In this example, the 1J22 bar undergoes an order-disorder transition at 730°C. To prevent brittleness after ordering at 730°C, the bar needs to be cooled to below 700°C at a cooling rate of >200°C / h, which can significantly improve brittleness.

[0029] Example 2 The following processing steps are also included before the rapid cooling step of Example 1: (1) Vacuum melting: 1J22 alloy raw materials are prepared according to the chemical composition of 1J22 alloy bars, and the 1J22 alloy raw materials are placed in a vacuum induction furnace for vacuum melting. The vacuum induction furnace is used to vacuum deoxidize and decarburize the molten steel, and the molten steel is continuously purified. The vacuum degree of the vacuum induction furnace is ≤1.3Pa, and the heating temperature in the furnace is 1660-1750℃; (2) Pouring: vacuum casting the molten steel after vacuum melting; (4) Forging: The peeled and cleaned material is sent into a heating furnace and heated to 1250-1300℃, kept warm for 5-6 hours, and then forged into bars.

[0030] In this embodiment, the chemical composition of the 1J22 alloy bar includes, by weight: 47.50%≤Co≤51.00%; 47.20%≤IronFe≤50.20%; 0.80%≤Vanadium V≤2.10%; 0.04%≤alloying element R≤2.20%; 0%≤Carbon C≤0.03%; The rest consists of unavoidable impurities from refining; The alloying elements R include manganese Mn, nickel Ni, chromium Cr and copper Cu, among which: 0.01%≤manganese Mn≤0.10%, 0.01%≤nickel Ni≤0.30%, 0.01%≤chromium Cr≤0.80%, 0.01%≤copper Cu≤1.00%.

[0031] To address the conflicting processing brittleness and magnetic properties of the 1J22 iron-cobalt-vanadium alloy, this process achieves high-purity material control through vacuum melting at a vacuum of ≤1.3Pa, followed by a multi-stage purification process at 1660-1750°C. A gradient hot working strategy is employed: high-temperature forging at 1250-1300°C followed by hot rolling with a 5-6h hold to form a uniform austenitic structure. An 800-850°C ice-salt quench induces grain refinement, and grain size control is achieved by combining cold rolling work hardening with a 3-6h vacuum / hydrogen shielded heat treatment at 800-1000°C. The process innovations include: reducing impurity element segregation through smelting purification, controlling O and C contents to ≤30ppm and ≤0.01%, respectively; optimizing the hot working parameters to achieve a forging deformation of 40-60% and a hot rolling reduction of 75-85%; and innovating a cooling rate of 200°C / s in ice-salt quenching to refine the grains to 10-15μm. Finally, the final heat treatment stage precisely controls the ordering process. This full-process control enables the material to have a hardness above HV350 and a high saturation magnetic induction intensity of 2.36T. The grain boundary brittleness is reduced by 60% compared with traditional processes, and the machining qualification rate is increased to 92% and the magnetic performance attenuation rate is less than 3%.

[0032] Example 3 like Figures 1 to 5 As shown, a cooling box with a temperature control function is used for rapid cooling of alloy bars. In the figure, a number of fixing fixtures 3 for fixing the alloy bars are horizontally fixedly installed in the box body 1. The fixing fixture 3 is composed of a trapezoidal plate 11, a limiting cylinder 14 and a limiting ring 15. There are several limiting cylinders 14 and they are all inserted on the trapezoidal plate 11. There are several limiting rings 15 and they are fixedly mounted on several limiting cylinders 14 respectively. A driving assembly 4 for driving the alloy bars to rotate is fixedly installed on the box body 1 and between the several fixing fixtures 3. The driving assembly 4 is composed of a hydraulic cylinder 16 and a push plate 17. The push plate 17 is fixedly mounted on the piston rod of the hydraulic cylinder 16.

[0033] Specifically, a first ventilation window 5 is provided on the lower side wall of the box body 1, a second ventilation window 6 is provided on the side wall of the box body 1, a first cooling fan 7 is fixedly installed on the lower inner wall of the box body 1 and on the inner side of the first ventilation window 5, a second cooling fan 8 is fixedly installed on the side inner wall of the box body 1 and on the inner side of the second ventilation window 6, a thermocouple 9 is fixedly installed on the side wall of the box body 1, and an upper cover 2 is installed on the upper end of the box body 1; an infrared temperature measuring camera 10 is fixedly installed on the inner wall of the upper cover 2.

[0034] In this embodiment, the trapezoidal plate 11 on the fixing fixture 3 is fixedly installed on the inner wall of the box body 1, and the trapezoidal plate 11 is also located between the first cooling fan 7 and the second cooling fan 8; two ventilation slots 12 are symmetrically opened on the trapezoidal plate 11 on the fixing fixture 3, and a number of positioning holes 13 are evenly opened on the trapezoidal plate 11 and between the two ventilation slots 12. The positioning holes 13 pass through the trapezoidal plate 11 up and down, the limiting cylinder 14 is inserted in the positioning hole 13, and the limiting ring 15 is located above the trapezoidal plate 11.

[0035] It should be noted that the hydraulic cylinder 16 on the driving assembly 4 is fixedly mounted on the outer wall of the box body 1, the piston rod of the hydraulic cylinder 16 passes inward through the side wall of the box body 1, and the push plate 17 is movably mounted between two adjacent fixing clamps 3, and the upper end of the push plate 17 is provided with an anti-slip protrusion.

[0036] It should be noted that the cooling box is provided with thermocouples and infrared temperature cameras, which can monitor the temperature changes of the rods during cooling in real time, and can monitor the temperature gradient of the rods along the diameter direction to determine the thermal stress situation. At the same time, heating elements and exhaust fans are provided inside the box, and the temperature inside the box can be controlled according to the set program. According to the temperature control curve, this box can control the cooling rate of the rods. In addition, by providing a fixing fixture composed of a trapezoidal plate, a limiting cylinder and a limiting ring in the box, the alloy rod to be cooled can be placed on the upper end of the trapezoidal plate, and the limiting cylinder is used to limit it. The contact area between the trapezoidal plate, the limiting cylinder and the alloy rod is small, which effectively reduces the contact thermal resistance, improves the heat dissipation efficiency, and enhances the airflow circulation, ensuring that the surface of the rod is evenly cooled, and avoiding the uneven heat dissipation problem caused by the large contact area of the traditional fixture. Finally, by setting a driving assembly consisting of a hydraulic cylinder and a push plate on the box, the driving assembly can drive the alloy rod placed on the fixed fixture to rotate, so that the alloy rod can dynamically adjust its position during the cooling process, ensuring that all parts of its surface are evenly contacted with the cooling airflow, significantly reducing the internal and external temperature difference and residual stress.

[0037] In practice, the outer sides of the first and second ventilation windows 5 and 6 are connected to a liquid inert gas source via sealing flanges, pipes, a pressure reducing valve, and an on-off valve. The inert gas source contains liquid helium, and the argon gas input into the cooling box has a temperature of 8-15°C and a pressure of 8-10 MPa.

[0038] It's important to note that both helium and argon are inert gases that isolate oxygen, preventing contact with the material during the cooling process, thereby maintaining the alloy's chemical stability and magnetic properties. Argon gas at 8-15°C and 8-10 MPa is introduced to rapidly remove heat through high-pressure gas, while preventing increased brittleness or internal stress concentration in the material caused by excessive cooling. The stable heat conduction properties of inert gases facilitate uniform cooling and minimize abnormal grain growth or phase transformation defects.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A process for producing 1J22 alloy bars with high mechanical and magnetic properties, characterized in that: The method comprises a rapid cooling step, wherein: in the cooling stage after the bar is forged or hot rolled, the bar is cooled from a high temperature of not less than 900°C to below 650°C at a cooling rate of at least 320°C / h.

2. The process for producing the 1J22 alloy bar with high mechanical and magnetic properties according to claim 1, wherein: In the cold treatment step, the rod is cooled from a high temperature of 900° C. to 1000° C. to below 650° C. at a cooling rate of 320° C. / h to 350° C. / h.

3. The manufacturing process of the 1J22 alloy bar with high mechanical and magnetic properties according to claim 1, characterized in that: In the cooling step, the rod is cooled from a high temperature of not less than 1000° C. to a temperature of 300° C. to 650° C. at a cooling rate of at least 350° C. / h to 500° C. / h.

4. The manufacturing process of the 1J22 alloy bar with high mechanical and magnetic properties according to claim 1, characterized in that: The following processing steps are also included before the rapid cooling step: (1) Vacuum melting: 1J22 alloy raw materials are prepared according to the chemical composition of 1J22 alloy bars, and the 1J22 alloy raw materials are placed in a vacuum induction furnace for vacuum melting. The vacuum induction furnace is used to vacuum deoxidize and decarburize the molten steel, and the molten steel is continuously purified. The vacuum degree of the vacuum induction furnace is ≤1.3Pa, and the heating temperature in the furnace is 1660-1750℃; (2) Pouring: Vacuum casting the molten steel after vacuum melting; (4) Forging: The peeled and cleaned material is sent into a heating furnace and heated to 1250-1300℃, kept warm for 5-6 hours, and then forged into bars.

5. The manufacturing process of the 1J22 alloy bar with high mechanical and magnetic properties according to claim 1, characterized in that: The chemical composition of the 1J22 alloy bar comprises by weight: 47.50%≤Cobalt (Co)≤51.00%; 47.20%≤Iron (Fe)≤50.20%; 0.80%≤Vanadium(V)≤2.10%; 0.04%≤alloying elements (R)≤2.20%; 0%≤Carbon (C)≤0.03%; The rest consists of unavoidable impurities from refining; The alloying elements (R) include manganese (Mn), nickel (Ni), chromium (Cr) and copper (Cu), wherein: 0.01%≤manganese (Mn)≤0.10%, 0.01%≤nickel (Ni)≤0.30%, 0.01%≤chromium (Cr)≤0.80%, 0.01%≤copper (Cu)≤1.00%.

6. The process for producing the 1J22 alloy bar with high mechanical and magnetic properties according to claim 1, characterized in that: Use a cooling box with temperature control function for alloy bars to perform rapid cooling treatment, where: Several fixing fixtures (3) for fixing the alloy bars are fixedly installed horizontally in the box body (1), and the fixing fixtures (3) are composed of a trapezoidal plate (11), a limiting cylinder (14) and a limiting ring (15). There are several limiting cylinders (14) and they are all inserted on the trapezoidal plate (11). There are several limiting rings (15) and they are respectively fixedly sleeved on several limiting cylinders (14). A driving assembly (4) for driving the alloy bars to rotate is fixedly installed on the box body (1) and between the several fixing fixtures (3). The driving assembly (4) is composed of a hydraulic cylinder (16) and a push plate (17). The push plate (17) is fixedly installed on the piston rod of the hydraulic cylinder (16). A first ventilation window (5) is provided on the lower side wall of the box body (1), a second ventilation window (6) is provided on the side wall of the box body (1), a first heat dissipation fan (7) is fixedly installed on the lower inner wall of the box body (1) and on the inner side of the first ventilation window (5), a second heat dissipation fan (8) is fixedly installed on the side inner wall of the box body (1) and on the inner side of the second ventilation window (6), a thermocouple (9) is fixedly inserted on the side wall of the box body (1), and an upper cover (2) is installed on the upper end of the box body (1); An infrared temperature measuring camera (10) is fixedly mounted on the inner wall of the upper cover (2).

7. The process for producing the 1J22 alloy rod with high mechanical and magnetic properties according to claim 6, characterized in that: The trapezoidal plate (11) on the fixing fixture (3) is fixedly mounted on the inner wall of the box (1), and the trapezoidal plate (11) is simultaneously located between the first heat dissipation fan (7) and the second heat dissipation fan (8); two ventilation slots (12) are symmetrically provided on the trapezoidal plate (11) on the fixing fixture (3); a plurality of positioning holes (13) are evenly provided on the trapezoidal plate (11) and between the two ventilation slots (12); the positioning holes (13) pass through the trapezoidal plate (11) from top to bottom; the limiting cylinder (14) is inserted into the positioning hole (13); and the limiting ring (15) is located above the trapezoidal plate (11).

8. The process for producing the 1J22 alloy rod with high mechanical and magnetic properties according to claim 7, characterized in that: The hydraulic cylinder (16) on the driving assembly (4) is fixedly mounted on the outer wall of the box (1), and the piston rod of the hydraulic cylinder (16) passes inward through the side wall of the box (1). The push plate (17) is movably mounted between two adjacent fixing clamps (3), and an anti-slip protrusion is provided on the upper end of the push plate (17).

9. The process for producing the 1J22 alloy rod with high mechanical and magnetic properties according to claim 8, characterized in that: The outer sides of the first ventilation window (5) and the second ventilation window (6) are connected to a liquid inert gas source via a sealing flange, a pipeline, a pressure reducing valve and an on-off valve.

10. The process for producing the 1J22 alloy rod with high mechanical and magnetic properties according to claim 9, characterized in that: The inert gas source is filled with liquid helium, and the argon gas input into the cooling box has a temperature of 8-15° C. and a pressure of 8-10 MPa.

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