Forming device based on zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes for sodium-cooled fast reactors
By setting zoned temperature control components on the inner and outer walls of the forming mold, the problem of temperature difference during the forming of large-diameter, thin-walled, low-thermal-expansion tubes was solved, achieving temperature consistency and improving the forming effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI XINFENG TUBE IND
- Filing Date
- 2025-07-31
- Publication Date
- 2026-05-26
AI Technical Summary
In the existing technology, large-diameter thin-walled low thermal expansion tubes have a short radial heat transfer path during forming, resulting in a significant temperature difference between the inner and outer surfaces, which affects the forming effect.
The forming device employs zoned temperature control. By setting multiple first and second temperature control sections on the inner and outer walls of the forming mold, the inner and outer walls are respectively controlled to control the temperature. These sections are evenly distributed along the axial direction to ensure temperature consistency.
By dividing the inner and outer walls into zones for temperature control, the temperature difference is reduced, improving the forming effect of large-diameter thin-walled low-thermal-expansion pipe fittings and ensuring temperature consistency at all locations.
Smart Images
Figure CN224273010U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of tube forming temperature control equipment, and in particular to a forming device for zoned temperature control of large-diameter thin-walled low thermal expansion tubes based on sodium-cooled fast reactor. Background Technology
[0002] Sodium-cooled fast reactors, as one of the important reactor types in fourth-generation nuclear energy systems, have advantages such as efficient utilization of nuclear fuel and transmutation of long-lived radioactive waste. Their internal components need to operate stably for extended periods under extreme environments such as high temperatures, strong neutron radiation, and liquid sodium corrosion, thus placing stringent requirements on the materials of key components. Large-diameter, thin-walled, low-thermal-expansion tubes are one of the core components of sodium-cooled fast reactors. The forming of these tubes requires temperature control. Therefore, we urgently need a forming device for zoned temperature control of large-diameter, thin-walled, low-thermal-expansion tubes in sodium-cooled fast reactors.
[0003] Currently, the temperature control method for pipe forming is overall temperature control. However, due to the characteristics of large-diameter thin-walled low thermal expansion pipes, such as large diameter, thin wall thickness, and low thermal expansion, the heat transfer path in the radial direction is extremely short, which will lead to a significant temperature difference between the inner and outer surfaces of the large-diameter thin-walled low thermal expansion pipes. If overall temperature control is adopted, it will affect the forming effect of the large-diameter thin-walled low thermal expansion pipes. Utility Model Content
[0004] To address the shortcomings of existing production technologies, the applicant provides a forming device for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors. By improving the structure of the forming device, zoned temperature control is achieved during the forming of large-diameter thin-walled low-thermal-expansion tubes, thereby improving the forming effect of large-diameter thin-walled low-thermal-expansion tubes.
[0005] The technical solution adopted in this utility model is as follows:
[0006] A forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors includes: a forming mold, multiple first temperature control units, and multiple second temperature control units. The multiple first temperature control units and second temperature control units are equally spaced along the axial direction of the forming mold. The first temperature control units and second temperature control units are arranged opposite to each other. The first temperature control units are embedded in the outer wall of the forming mold, and the second temperature control units are embedded in the inner wall of the forming mold. When forming the large-diameter thin-walled low-thermal-expansion tubes, the heat generated by the first temperature control units acts on the outer wall area of the large-diameter thin-walled low-thermal-expansion tubes, and the heat generated by the second temperature control units acts on the inner wall area of the large-diameter thin-walled low-thermal-expansion tubes.
[0007] Therefore, by using a first temperature control unit and a second temperature control unit, the inner and outer walls of the large-diameter thin-walled low-thermal-expansion tube for sodium-cooled fast reactors can be zoned for temperature control. The design of multiple first and second temperature control units evenly spaced along the axial direction of the forming mold enables axial zoned temperature control during the forming of the large-diameter thin-walled low-thermal-expansion tube. Compared to existing overall temperature control forming methods, this method is simpler in structure and easier to operate. Zoned temperature control of the inner and outer walls reduces the temperature difference between the inner and outer surfaces of the large-diameter thin-walled low-thermal-expansion tube. Axial zoned temperature control ensures that the temperature at each position along the axial direction remains consistent, and that the temperature response at each position is consistent, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion tube.
[0008] As a further improvement to the above technical solution: the first temperature control unit includes: a first heating block and two second heating blocks, the two second heating blocks are respectively located at both ends of the first heating block, the first heating block and the second heating blocks are both embedded in the outer wall of the forming mold, the width of the first heating block is d1 and the thickness is h1, and the width of the second heating block is d2 and the thickness is h2.
[0009] As a further improvement to the above technical solution: the second temperature control unit includes: a third heating block and two fourth heating blocks, the two fourth heating blocks being located at both ends of the third heating block respectively, the third heating block and the fourth heating blocks being embedded in the inner wall of the forming mold, the width of the third heating block being d3 and the thickness being h3, and the width of the fourth heating block being d4 and the thickness being h4.
[0010] As a further improvement to the above technical solution: the first heating block is arranged opposite to the third heating block, and the second heating block is arranged opposite to the fourth heating block.
[0011] As a further improvement to the above technical solution: d1 = d3, d2 = d4, d1 > d2, d3 > d4. Therefore, through the design method of d1 = d3, d2 = d4, d1 > d2, d3 > d4, the temperature at all positions in the axial direction of the large-diameter thin-walled low-thermal-expansion tube remains consistent, and the temperature response at each position remains consistent, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion tube.
[0012] As a further improvement to the above technical solution: h1 = h2, h3 = h4, h1 > h3, h2 > h4. Therefore, by using the design method of h1 = h2, h3 = h4, h1 > h3, h2 > h4, the temperature difference between the inner and outer surfaces of large-diameter thin-walled low-thermal-expansion tubes can be reduced, thereby improving the forming effect of large-diameter thin-walled low-thermal-expansion tubes.
[0013] As a further improvement to the above technical solution: the forming mold includes an outer mold and an inner mold, the first temperature control part is embedded in the outer mold, the second temperature control part is embedded in the inner mold, and the accommodating space formed between the outer mold and the inner mold is used to form a large-diameter thin-walled low thermal expansion tube.
[0014] As a further improvement to the above technical solution: the outer mold includes a first outer sub-mold and a second outer sub-mold, the first outer sub-mold being integrally formed with the inner mold, and the first outer sub-mold and the second outer sub-mold being interlocked. Thus, the integral formation of the first outer sub-mold and the inner mold ensures that the inner wall of the large-diameter thin-walled low-thermal-expansion pipe remains smooth and burr-free during forming, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion pipe; the interlocking of the first outer sub-mold and the second outer sub-mold facilitates the removal of the formed large-diameter thin-walled low-thermal-expansion pipe.
[0015] As a further improvement to the above technical solution: a snap-fit groove is provided on the first outer mold, and a snap-fit block is provided on the second outer mold, the snap-fit block being adapted to the snap-fit groove; the snap-fit block is inserted into the snap-fit groove so that the first outer mold and the second outer mold are snapped together. Thus, through the mutual cooperation of the snap-fit block and the snap-fit groove, the first outer mold and the second outer mold can be limited, so that a space for forming large-diameter, thin-walled, low-thermal-expansion tubes can be formed between the first outer mold, the second outer mold, and the inner mold.
[0016] As a further improvement to the above technical solution, it also includes: two connecting parts, each located on one side of the forming mold, and the connecting parts are used to fix the first outer mold and the second outer mold; each connecting part includes: a first connecting block, a second connecting block, and two locking members, the first connecting block abutting against the first outer mold, the second connecting block abutting against the second outer mold, and the first connecting block and the second connecting block being connected by the locking members. Thus, the connecting parts reinforce the first outer mold and the second outer mold, further ensuring that the second outer mold will not move relative to the first outer mold, thereby further improving the forming effect of large-diameter thin-walled low-thermal-expansion pipe fittings.
[0017] The beneficial effects of this utility model are as follows:
[0018] By employing a first temperature control unit and a second temperature control unit, zoned temperature control of the inner and outer walls is achieved during the forming of large-diameter thin-walled low-thermal-expansion tubes for sodium-cooled fast reactors. The design utilizes multiple first and second temperature control units evenly spaced along the axial direction of the forming mold to achieve axial zoned temperature control during the forming of these tubes. Compared to existing overall temperature control forming methods, this approach is simpler in structure and easier to operate. Zoned temperature control of the inner and outer walls reduces the temperature difference between the inner and outer surfaces of the large-diameter thin-walled low-thermal-expansion tubes. Axial zoned temperature control ensures that the temperature at all locations along the axial direction remains consistent, and that the temperature response at each location is uniform, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion tubes.
[0019] This utility model also has the following advantages:
[0020] 1. This utility model uses the design method of d1=d3, d2=d4, d1>d2, d3>d4 to ensure that the temperature of each position in the axial direction of the large-diameter thin-walled low thermal expansion tube remains consistent and the temperature response of each position remains consistent, thereby improving the forming effect of the large-diameter thin-walled low thermal expansion tube.
[0021] 2. This utility model, through the design method of h1=h2, h3=h4, h1>h3, h2>h4, can reduce the temperature difference between the inner and outer surfaces of large-diameter thin-walled low-thermal-expansion tubes, thereby improving the forming effect of large-diameter thin-walled low-thermal-expansion tubes. Attached Figure Description
[0022] Figure 1 This is a first-view structural schematic diagram of the forming device for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors according to this utility model.
[0023] Figure 2 For the present utility model Figure 1 Enlarged schematic diagram of a local structure at point A;
[0024] Figure 3 This is a second-view structural schematic diagram of the forming device for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors according to this utility model.
[0025] Figure 4 For the present utility model Figure 3 Enlarged schematic diagram of the local structure at point B;
[0026] Figure 5 This is an exploded view from the first perspective of the forming device for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors.
[0027] Figure 6 For the present utility model Figure 5 Enlarged schematic diagram of the local structure at point C;
[0028] Figure 7 This is an exploded view from the second perspective of the forming device for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors of this utility model.
[0029] Figure 8 For the present utility model Figure 7 Enlarged schematic diagram of the local structure at point D;
[0030] Figure 9 This is a partial cross-sectional view of the forming device 9 for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors.
[0031] Among them: 1. Forming mold;
[0032] 101. Outer mold; 1011. First outer sub-mold; 1012. Second outer sub-mold; 1013. Snap-fit groove; 1014. Snap-fit block; 102. Inner mold;
[0033] 2. First temperature control unit;
[0034] 201. First heating block; 202. Second heating block;
[0035] 3. Second temperature control unit;
[0036] 301. Third heating block; 302. Fourth heating block;
[0037] 4. Connecting parts;
[0038] 401. First connecting block; 402. Second connecting block; 403. Locking component;
[0039] 5. Baffle. Detailed Implementation
[0040] The specific embodiments of this utility model are described below with reference to the accompanying drawings.
[0041] like Figures 1 to 9The diagram shows the preferred embodiment of this utility model. The forming device for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors includes: a forming mold 1, multiple first temperature control parts 2, and multiple second temperature control parts 3. The multiple first temperature control parts 2 and second temperature control parts 3 are distributed at equal intervals along the axial direction of the forming mold 1. The first temperature control parts 2 and the second temperature control parts 3 are arranged opposite to each other. The first temperature control parts 2 are embedded in the outer wall of the forming mold 1, and the second temperature control parts 3 are embedded in the inner wall of the forming mold 1. When forming the large-diameter thin-walled low-thermal-expansion tubes, the heat generated by the first temperature control parts 2 acts on the outer wall area of the large-diameter thin-walled low-thermal-expansion tubes, and the heat generated by the second temperature control parts 3 acts on the inner wall area of the large-diameter thin-walled low-thermal-expansion tubes. Therefore, by using the first temperature control unit 2 and the second temperature control unit 3, the inner and outer walls of the large-diameter thin-walled low-thermal-expansion tube for sodium-cooled fast reactors can be zoned for temperature control. By using a design in which multiple first temperature control units 2 and multiple second temperature control units are evenly distributed along the axial direction of the forming mold 1, axial zoned temperature control can be achieved during the forming of the large-diameter thin-walled low-thermal-expansion tube for sodium-cooled fast reactors. Compared with the existing forming method of overall temperature control, this method has a simple structure and is easy to operate. By using zoned temperature control of the inner and outer walls, the temperature difference between the inner and outer surfaces of the large-diameter thin-walled low-thermal-expansion tube can be reduced. By using zoned temperature control in the axial direction, the temperature of each position of the large-diameter thin-walled low-thermal-expansion tube in the axial direction can be kept consistent and the temperature response of each position can be kept consistent, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion tube.
[0042] In this embodiment, the first temperature control unit 2 includes a first heating block 201 and two second heating blocks 202. The two second heating blocks 202 are respectively located at both ends of the first heating block 201. The first heating block 201 and the second heating blocks 202 are both embedded on the outer wall of the forming mold 1. The width of the first heating block 201 is d1 and the thickness is h1. The width of the second heating block 202 is d2 and the thickness is h2.
[0043] In this embodiment, the second temperature control unit 3 includes a third heating block 301 and two fourth heating blocks 302. The two fourth heating blocks 302 are located at both ends of the third heating block 301. The third heating block 301 and the fourth heating blocks 302 are both embedded in the inner wall of the forming mold 1. The width of the third heating block 301 is d3 and the thickness is h3. The width of the fourth heating block 302 is d4 and the thickness is h4.
[0044] In this embodiment, the first heating block 201 and the third heating block 301 are arranged opposite to each other, and the second heating block 202 and the fourth heating block 302 are arranged opposite to each other; d1 = d3, d2 = d4, d1 > d2, d3 > d4; h1 = h2, h3 = h4, h1 > h3, h2 > h4. Thus, by using the design of d1 = d3, d2 = d4, d1 > d2, d3 > d4, the temperature at each position in the axial direction of the large-diameter thin-walled low-thermal-expansion tube remains consistent, and the temperature response at each position remains consistent, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion tube; by using the design of h1 = h2, h3 = h4, h1 > h3, h2 > h4, the temperature difference between the inner and outer surfaces of the large-diameter thin-walled low-thermal-expansion tube can be reduced, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion tube.
[0045] In this embodiment, the forming mold 1 includes an outer mold 101 and an inner mold 102. A first temperature control part 2 is embedded in the outer mold 101, and a second temperature control part 3 is embedded in the inner mold 102. The accommodating space formed between the outer mold 101 and the inner mold 102 is used to form a large-diameter thin-walled low-thermal-expansion pipe fitting. The outer mold 101 includes a first outer sub-mold 1011 and a second outer sub-mold 1012. The first outer sub-mold 1011 is integrally formed with the inner mold 102, and the first outer sub-mold 1011 and the second outer sub-mold 1012 are engaged. The first outer sub-mold 1011 is provided with a engaging groove 1013, and the second outer mold 1012 is provided with a engaging block 1014. The engaging block 1014 is adapted to the engaging groove 1013. The engaging block 1014 is inserted into the engaging groove 1013 so that the first outer sub-mold 1011 and the second outer mold 1012 are engaged. Therefore, the first outer mold 1011 and the inner mold 102 are integrally formed, which ensures that the inner wall of the large-diameter thin-walled low-thermal-expansion tube remains smooth and free of burrs during forming, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion tube. The first outer mold 1011 and the second outer mold 1012 are interlocked, which facilitates the removal of the large-diameter thin-walled low-thermal-expansion tube after forming. Through the mutual cooperation of the interlocking block 1014 and the interlocking groove 1013, the first outer mold 1011 and the second outer mold 1012 can be limited, so that a receiving space for forming the large-diameter thin-walled low-thermal-expansion tube can be formed between the first outer mold 1011, the second outer mold 1012 and the inner mold 102.
[0046] It should be noted that:
[0047] 1. The cross-sectional shape of the first heating block 201 and the second heating block 202 is arc-shaped, and each first temperature control unit 2 corresponds to two first heating blocks 201 and four second heating blocks 202. The two first heating blocks 201 are respectively embedded in the first outer mold 1011 and the second outer mold 1012. Two of the four second heating blocks 202 are embedded in the first outer mold 1011 and the other two are embedded in the second outer mold 1012.
[0048] 2. The cross-sectional shape of the third heating block 301 and the fourth heating block 302 is annular;
[0049] Third, baffles 5 are provided on one side of the first outer mold 1011 and the inner mold 102, and on one side of the second outer mold 1012, so that one side of the accommodating space of the forming mold 1 is in a closed state and the other side is in an open state. The closed state ensures that the molten liquid will not flow out, and the open state ensures that the molten liquid can enter the accommodating space formed by the outer mold 101 and the inner mold 102.
[0050] In this embodiment, the system further includes two connecting portions 4, located on opposite sides of the forming mold 1, which are used to fix the first outer mold 1011 and the second outer mold 1012. Each connecting portion 4 includes a first connecting block 401, a second connecting block 402, and two locking members 403. The first connecting block 401 abuts against the first outer mold 1011, and the second connecting block 402 abuts against the second outer mold 1012. The first connecting block 401 and the second connecting block 402 are connected by the locking members 403. Thus, the connecting portions 4 reinforce the first outer mold 1011 and the second outer mold 1012, further ensuring that the second outer mold 1012 will not move relative to the first outer mold 1011, thereby further improving the forming effect of the large-diameter thin-walled low-thermal-expansion tube.
[0051] For example, locking component 403 uses bolts.
[0052] The forming process of this utility model based on the large-diameter thin-walled low thermal expansion tube of a sodium-cooled fast reactor is as follows: First, the second outer mold 1012 is inserted into the first outer mold 1011, and the first outer mold 1011 and the second outer mold 1012 are fixed together by two connecting parts 4; then, the first heating block 201, the second heating block 202, the third heating block 301, and the fourth heating block 302 are activated to preheat the forming mold 1; then, molten liquid is injected into the receiving space formed by the outer mold 101 and the inner mold 102, and the first heating block 201 and the second heating block 202 are used to... The heat generated by the third heating block 301 and the fourth heating block 302 during operation is used to reheat the liquid so that the molten liquid fills the containment space. Then, the first heating block 201, the second heating block 202, the third heating block 301 and the fourth heating block 302 are closed so that the molten liquid cools and solidifies. Finally, the locking member 403 is loosened by rotating so that the first connecting block 401 and the second connecting block 402 are disengaged from each other and removed from the second outer mold 1012 so that the large-diameter thin-walled low thermal expansion tube of the sodium cold fast reactor can be taken out after cooling and solidification.
[0053] In summary, this invention achieves zoned temperature control of the inner and outer walls during the forming of large-diameter thin-walled low-thermal-expansion tubes for sodium-cooled fast reactors through the first temperature control unit 2 and the second temperature control unit 3. The design of multiple first temperature control units 2 and multiple second temperature control units evenly distributed along the axial direction of the forming mold 1 enables zoned temperature control in the axial direction during the forming of large-diameter thin-walled low-thermal-expansion tubes for sodium-cooled fast reactors. Compared to existing overall temperature control forming methods, this method is simpler in structure and easier to operate. Zoned temperature control of the inner and outer walls reduces the temperature difference between the inner and outer surfaces of the large-diameter thin-walled low-thermal-expansion tubes. Zoned temperature control in the axial direction ensures that the temperature at each position of the large-diameter thin-walled low-thermal-expansion tube remains consistent and that the temperature response at each position remains consistent, thereby improving the forming effect of the large-diameter thin-walled low-thermal-expansion tubes.
[0054] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.
Claims
1. A forming device for zoned temperature control of large-diameter, thin-walled, low-thermal-expansion tubes based on a sodium-cooled fast reactor, characterized in that, include: Forming mold (1), and Multiple first temperature control units (2) and multiple second temperature control units (3) are distributed at equal intervals along the axial direction of the forming mold (1). The first temperature control units (2) and the second temperature control units (3) are arranged opposite to each other. The first temperature control units (2) are embedded on the outer wall of the forming mold (1), and the second temperature control units (3) are embedded on the inner wall of the forming mold (1). When forming a large-diameter thin-walled low-thermal-expansion tube, the heat generated by the first temperature control unit (2) acts on the outer wall area of the large-diameter thin-walled low-thermal-expansion tube, and the heat generated by the second temperature control unit (3) acts on the inner wall area of the large-diameter thin-walled low-thermal-expansion tube.
2. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 1, characterized in that: The first temperature control unit (2) includes: A first heating block (201) and two second heating blocks (202) are respectively located at both ends of the first heating block (201). The first heating block (201) and the second heating blocks (202) are both embedded on the outer wall of the forming mold (1). The width of the first heating block (201) is d1 and the thickness is h1. The width of the second heating block (202) is d2 and the thickness is h2.
3. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 2, characterized in that: The second temperature control unit (3) includes: The third heating block (301) and two fourth heating blocks (302) are respectively located at both ends of the third heating block (301). The third heating block (301) and the fourth heating blocks (302) are both embedded in the inner wall of the forming mold (1). The width of the third heating block (301) is d3 and the thickness is h3. The width of the fourth heating block (302) is d4 and the thickness is h4.
4. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 3, characterized in that: The first heating block (201) is disposed opposite to the third heating block (301), and the second heating block (202) is disposed opposite to the fourth heating block (302).
5. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 3, characterized in that: d1=d3, d2=d4, d1>d2, d3>d4.
6. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 3, characterized in that: h1=h2, h3=h4, h1>h3, h2>h4.
7. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 1, characterized in that: The forming mold (1) includes: The outer mold (101) and the inner mold (102) are provided. The first temperature control part (2) is embedded in the outer mold (101) and the second temperature control part (3) is embedded in the inner mold (102). The accommodating space formed between the outer mold (101) and the inner mold (102) is used to form a large-diameter thin-walled low thermal expansion tube.
8. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 7, characterized in that: The outer mold (101) includes: The first outer mold (1011) and the second outer mold (1012) are integrally formed with the inner mold (102) and are engaged with each other.
9. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 8, characterized in that: The first outer mold (1011) is provided with a snap-fit groove (1013), and the second outer mold (1012) is provided with a snap-fit block (1014), the snap-fit block (1014) being adapted to the snap-fit groove (1013); The snap-fit block (1014) is inserted into the snap-fit groove (1013) so that the first outer sub-mold (1011) and the second outer sub-mold (1012) snap together.
10. The forming apparatus for zoned temperature control of large-diameter thin-walled low-thermal-expansion tubes based on sodium-cooled fast reactors as described in claim 8, characterized in that: Also includes: Two connecting parts (4) are located on both sides of the forming mold (1), and the connecting parts (4) are used to fix the first outer sub-mold (1011) and the second outer sub-mold (1012); Each of the connecting parts (4) includes: The system comprises a first connecting block (401), a second connecting block (402), and two locking members (403). The first connecting block (401) abuts against the first outer mold (1011), and the second connecting block (402) abuts against the second outer mold (1012). The first connecting block (401) and the second connecting block (402) are connected by the locking members (403).