Large-scale strain-strengthened alloy segmental arc shape collaborative manufacturing method

Abstract

The invention belongs to the field of metal rolling, and particularly relates to a shape collaborative manufacturing method for a large strain-strengthened alloy arc section, a semi-hardened large-size stainless steel arc section is directly prepared through combination of cryogenic pretreatment and asymmetrical rolling, in the roll bending forming process, asymmetric plastic deformation is induced through the speed difference to achieve curvature directional regulation and control, and the shape collaborative manufacturing method for the large strain-strengthened alloy arc section is achieved. And on the basis of the calibrated pressing amount-different speed ratio-curvature curve, laser ranging is matched to monitor the arc length and the curvature radius on line, and finally accurate control over the curvature radius is achieved. Meanwhile, the mechanical property improving effect is considered, and collaborative manufacturing of the performance and the shape of the arc section is achieved. The whole technological process is short and efficient, multiple intermediate steps are reduced compared with a traditional method, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of metal rolling technology, and in particular to a method for collaboratively manufacturing large-scale strain-hardened alloy arc segments. Background Art

[0002] Launch vehicles play a vital role in carrying out a variety of deep space exploration missions and are the cornerstone of my country's manned spaceflight and deep space exploration programs. Among them, the tank, as a key component of the rocket, accounts for 60% of the total mass of the rocket. It is not only used to store propellants, but also bears key structural loads, which has a decisive impact on improving the overall performance of the rocket. With the continuous improvement of the requirements for the carrying capacity of launch vehicles, in order to maintain a reasonable aspect ratio, the diameter of my country's heavy-duty launch vehicles is expected to expand to 10 meters. In the field of commercial aviation, the diameter of rockets is usually at the level of 3-5 meters. Lightweighting by improving material strength has become an important way to reduce costs. The application of high-strength materials can reduce structural weight, thereby increasing the payload ratio, reducing fuel consumption and launch costs. Changes in structural size and performance requirements have posed new challenges to the manufacturing process of the arc-shaped barrel section of future large launch vehicle tanks.

[0003] Stainless steel and 5 series aluminum alloys have been widely used in aerospace and other fields due to their excellent mechanical properties and corrosion resistance. The use of stainless steel to make rocket tanks can not only significantly reduce material costs, but also improve the overall performance of the product. However, 304L stainless steel and 5A06 aluminum alloys under normal conditions are difficult to meet the needs of high-performance application scenarios such as launch vehicles due to their low strength. Although semi-hardened stainless steel and aluminum alloys obtained by cold rolling deformation can significantly improve the yield strength of the material, their production cost is high, the process is complex, and there are many problems. For example: it is difficult to roll semi-hardened stainless steel with a small curvature radius, which may damage the equipment or cause safety risks; semi-hardened stainless steel has a high yield strength and low elongation, and is prone to cracking or stress concentration during forming; the rebound effect is significant during rolling, and the curvature control is difficult, requiring multiple trials or complex algorithm compensation; residual stress may cause unpredictable deformation or failure in subsequent processing. In order to meet the performance and precision requirements of the arc segment, the traditional process usually first improves the material strength through cold rolling, and then performs roll forming. This process method that separates forming and performance optimization has the problem of shape-property collaborative manufacturing, making it difficult to achieve the ideal shape and performance at the same time, further increasing costs and cycles. Therefore, directly using cold-rolled semi-hardened stainless steel or aluminum alloy sheets for roll forming to manufacture tank arc segments faces both technical and economic challenges. Summary of the invention

[0004] The embodiment of the present application provides a method for the coordinated manufacturing of the shape properties of large strain-hardened alloy arc segments, which is used to solve the problem in the prior art that semi-hardened stainless steel / strain-hardened aluminum alloy arc segments cannot achieve coordinated manufacturing of the shape properties.

[0005] To achieve the above objectives, the present application provides a large-scale strain-hardened alloy arc segment shape collaborative manufacturing method, comprising the following steps: Coil unwinding: After unwinding, the coil is sent to the unwinding machine for unwinding. The thickness of the unwinding plate is 2mm-6mm and the width is 0.5mm-3m; Cryogenic treatment: The flattened plates are transported to the cryogenic treatment box, where liquid nitrogen is used to cool the plates until the surface temperature reaches -196°C. Rolling and bending: The plate that has been cryogenically treated is sent to the equal-diameter twin-roll mill. The diameter of the roll is 600mm-1500mm. The rolling deformation is controlled by adjusting the distance between the upper and lower rolls. The rolling deformation is 5%-30%. When the arc segment is formed, the downward pressure is determined by the mechanical performance requirements. Then, under the same downward pressure condition, the influence of different speed ratios on the curvature of the formed plate is determined by finite element simulation. The rolling speed of the roll is 0.1m / s-1.5m / s, and the speed ratio is greater than 1 and less than 1.5. After the plate leaves the equal-diameter twin-roll mill, the arc length and curvature radius of the arc segment are monitored online using laser ranging. When the target arc length is reached, the plate is cut at the exit of the equal-diameter twin-roll mill. The curvature radius of the formed arc segment is 1m-8m, and the arc length of the formed arc segment is 1 / 8-1 / 2 of the equivalent circumference of the arc segment curvature.

[0006] Preferably, the cryogenic treatment specifically includes: conveying the flattened plate to a cryogenic treatment box via a conveyor belt, the working length range of the cryogenic treatment box is 0.5m-3m, cooling the plate by liquid nitrogen spraying in the cryogenic treatment box, and monitoring the surface temperature of the plate by a thermometer until the surface temperature of the plate reaches -196°C.

[0007] Preferably, the plate has a thickness of 4.7 mm and a width of 1.5 m; and the working length of the cryogenic treatment box is 2 m.

[0008] Preferably, in the roll bending forming, the roll diameter is 900 mm, the rolling deformation is 15%, the rolling speed of the upper roll is 0.3 m / s, the speed ratio is 1.04, and the arc segment diameter after forming is 10.6 m.

[0009] Preferably, in the roll-bending forming, based on the material plastic deformation theory, the shear strain difference caused by the downward pressure and the speed ratio is quantified through finite element simulation, revealing its quantitative relationship with the radius of curvature; for a single-pass process, the simulation directly predicts the regulating effect of the speed ratio and the rolling deformation on the curvature; when multiple passes are required due to excessive rolling deformation, the simulation simulates the progressive influence of multiple passes of accumulated plastic strain on the curvature by loading the deformation in steps.

[0010] Preferably, in the rolling bending forming, the distance between the upper and lower rollers is regulated in real time by a hydraulic servo system, and the error of the downward pressure is ±0.2mm; the speeds of the upper and lower rollers are independently driven by variable frequency motors, and the speed ratio control accuracy is ±0.01.

[0011] Preferably, in the roll-bending forming, after the plate leaves the equal-diameter twin-roll rolling mill, two sets of mechanical clamps are suspended by an overhead crane to clamp the two sides of the arc segment.

[0012] Preferably, after the rolling and bending forming, the method further comprises: Hoisting and transfer: Use a circular hoist with a diameter of 1mm-13m to fix 5-10 points of the arc segment, flip the arc segment axially and then transfer it. The axis of the flipped arc segment is perpendicular to the ground, and the points are evenly distributed along the circumference to ensure that the arc segment remains stable during the entire transfer process and avoid deformation caused by local uneven force.

[0013] The beneficial effects of the large-scale strain-hardened alloy arc segment shape collaborative manufacturing method provided by the present application are: The arc curvature of strain-hardened alloys (such as semi-hardened stainless steel and strain-hardened aluminum alloy) prepared by "deep cooling + asynchronous rolling" is significantly affected by the rolling pressure and the roller speed ratio. This application uses cryogenic pretreatment combined with asynchronous rolling to directly prepare large-size semi-hardened stainless steel arc segments. During the rolling and bending process, the speed difference is used to induce asymmetric plastic deformation to achieve curvature directional control. Based on the calibrated pressure-speed ratio-curvature curve, the arc length and curvature radius are monitored online with laser ranging, and finally the curvature radius of 1m-8m is precisely controlled. At the same time, the mechanical performance improvement effect is taken into account, and the coordinated manufacturing of arc segment performance and shape is realized. The entire process is short and efficient, and compared with the traditional method, multiple intermediate steps are reduced, which improves production efficiency and reduces production costs; the introduction of cryogenic pretreatment before rolling can enable the material to obtain a higher yield strength at the same pressure, thereby avoiding the problem of difficulty in forming caused by the large room temperature rolling pressure required to achieve the target yield strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] in: Figure 1 It is a process flow chart of a large-scale strain-hardened alloy arc segment shape collaborative manufacturing method shown in one embodiment of the present application; Figure 2 This is the influence of deformation amount and speed ratio on the curvature of the arc plate during the rolling and bending forming process shown in an embodiment of the present application; Figure 3 It is a variation law of the radius of curvature of the arc segment during the rolling process at different speed ratios under the conditions of a roller diameter of 900 mm, a deformation of 15%, and an upper roller rolling speed of 0.3 m / s shown in an embodiment of the present application; Figure 4 It is a schematic diagram of the state change of the arc segment during the entire rolling and bending forming process from the beginning to the end using a large-scale strain-hardened alloy arc segment shape collaborative manufacturing method shown in one embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present application, the present application will be described more comprehensively with reference to the relevant drawings below. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many other different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0017] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0018] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0019] The embodiment of the present application provides a method for collaboratively manufacturing large-scale strain-hardened alloy arc segments, such as Figure 1 As shown, the following steps are included: Coil flattening: After the coil is unrolled, it is sent to the flattening machine for flattening. The thickness of the plate after flattening is 2mm-6mm and the width is 0.5mm-3m. It should be noted that when the plate thickness is less than 2mm, it is difficult to meet the rigidity requirements of the rocket tank. When the plate thickness exceeds 6mm, it is not conducive to the realization of the weight reduction effect. When the width of the plate is less than 0.5m, the number of longitudinal welds in the tank will increase too much, increasing the risk of fuel leakage. When the width of the plate is greater than 3m, the production cost will increase significantly due to the limitation of the rolling mill width.

[0020] Preferably, the plate has a thickness of 4.7 mm and a width of 1.5 m; and the working length of the cryogenic treatment box is 2 m.

[0021] Cryogenic treatment: The flattened plates are transported to a cryogenic treatment box where liquid nitrogen is used to cool the plates until the surface temperature reaches -196°C.

[0022] Among them, cryogenic treatment specifically includes: conveying the flattened plate to the cryogenic treatment box through a conveyor belt. The working length of the cryogenic treatment box ranges from 0.5m to 3m. It should be noted that if the working length of the cryogenic treatment box is less than 0.5m, the forming efficiency will be too low. If it is greater than 3m, it will easily lead to uneven temperature distribution of the plate during rolling. Liquid nitrogen spray is used to cool the plate in the cryogenic treatment box, and the surface temperature of the plate is monitored by a thermometer until the surface temperature of the plate reaches -196℃.

[0023] Rolling and bending: The plate after cryogenic treatment is sent to the equal diameter twin-roll mill, and the diameter of the roll is 600mm-1500mm. It should be noted that when the roll diameter is less than 600mm, it is difficult to withstand high-load rolling deformation. When the roll diameter is greater than 1500mm, the edge thinning or surface scratches of the plate are prone to occur, and it is difficult to achieve high-precision control. The rolling deformation is controlled by adjusting the spacing between the upper and lower rolls. The rolling deformation is 5%-30%. The size of the deformation plays a decisive role in the mechanical properties of the arc segment after forming. When the deformation is less than 5%, the yield strength of the plate after rolling is low and it is difficult to meet the mechanical properties requirements. When the deformation is greater than 30%, the elongation of the material decreases, and the rolling force increases significantly, resulting in difficulty in forming. The deformation and the speed difference between the upper and lower rolls (speed ratio) are the key factors determining the curvature of the arc segment. The speed of the upper roll is V1, the speed of the lower roll is V2, and the speed ratio is defined as V2 / V1. When the arc segment bends toward the upper roll, the curvature is defined as positive, otherwise the curvature is negative. When the deformation is less than 20%, the arc curvature is always positive, and the arc curvature increases with the increase of the speed ratio. When the deformation is between 20% and 30%, the arc curvature changes from negative curvature to positive curvature as the speed ratio increases. When the arc is formed, the pressure is determined by the mechanical performance requirements, and then the influence of different speed ratios on the curvature of the formed plate is determined by finite element simulation under the same pressure. The influence of deformation and speed ratio on the curvature of the arc plate during rolling and bending is shown in the figure. Figure 2 As shown. The rolling speed of the roller is 0.1m / s-1.5m / s. It should be noted here that when the rolling speed is less than 0.1m / s, the long-term exposure of the cryogenically treated plate causes the temperature to rise, reducing the effect of cryogenic rolling. When the rolling speed is greater than 1.5m / s, the material does not have enough time to fully flow plastically, and it is easy to have surface cracks, edge warping or internal residual stress concentration. The speed ratio is greater than 1 and less than 1.5. When the speed ratio is less than 1, the plate is easy to bend downward and contact the ground, interfering with the normal operation of the rolling mill. When the speed ratio is greater than 1.5, the curvature of the plate tends to be stable and no longer changes, and it is easy to cause surface cracks and affect the quality of the finished product. After the plate leaves the equal-diameter twin-roll mill, the arc length and curvature radius of the arc segment are monitored online using laser ranging. When the target arc length is reached, the plate is cut at the exit of the equal-diameter twin-roll mill. The curvature radius of the formed arc segment is 1m-8m, and the arc length of the formed arc segment is 1 / 8-1 / 2 of the equivalent circumference of the arc segment curvature.

[0024] In roll-bending forming, based on the material plastic deformation theory, finite element simulation is used to quantify the shear strain differences caused by the downward pressure and the speed ratio, revealing their quantitative relationship with the radius of curvature; for a single-pass process, the simulation directly predicts the regulatory effect of the speed ratio and rolling deformation on the curvature; when multiple passes are required due to excessive rolling deformation, the simulation simulates the progressive influence of multiple passes of accumulated plastic strain on the curvature by loading the deformation in steps.

[0025] During rolling and bending, the hydraulic servo system is used to adjust the distance between the upper and lower rollers in real time, and the pressure error is ±0.2mm; the speeds of the upper and lower rollers are independently driven by variable frequency motors, and the speed ratio control accuracy is ±0.01.

[0026] During rolling and bending, after the plate leaves the equal-diameter twin-roll mill, an overhead crane is used to hang two sets of mechanical clamps to clamp the two sides of the arc segment to prevent the formed arc segment from being deformed or otherwise damaged due to its own weight.

[0027] After rolling and bending, the following steps are also included: Hoisting and transfer: Use a circular hoist with a diameter of 1mm-13m to fix 5-10 points of the arc segment, flip the arc segment axially and then transfer it. The axis of the flipped arc segment is perpendicular to the ground, and the points are evenly distributed along the circumference to ensure that the arc segment remains stable during the entire transfer process and avoid deformation caused by local uneven force.

[0028] It should be noted that the use of "deep cooling + asynchronous rolling" to improve the mechanical properties of materials has been widely reported in the academic community. However, the curvature change law of the plate after asynchronous rolling deformation is not clear, that is, it is only "formed" but not "formed". The arc curvature of strain-hardened alloys (such as semi-hardened stainless steel and strain-hardened aluminum alloys) prepared by "deep cooling + asynchronous rolling" is significantly affected by the rolling pressure and the speed ratio of the rollers.

[0029] In the embodiment of the present application, cryogenic pretreatment is combined with asynchronous rolling to directly prepare large-sized stainless steel arc segments in a semi-hardened state. During the rolling and bending process, the speed difference is used to induce asymmetric plastic deformation to achieve curvature directional control. Based on the calibrated downward pressure-speed ratio-curvature curve, the arc length and curvature radius are monitored online with laser ranging for dynamic compensation, and finally the curvature radius of 1m-8m is precisely controlled. At the same time, the mechanical performance improvement effect is taken into account, and the coordinated manufacturing of arc segment performance and shape is realized. The entire process is short and efficient, and compared with the traditional method, multiple intermediate steps are reduced, which improves production efficiency and reduces production costs. The introduction of cryogenic pretreatment before rolling can enable the material to obtain a higher yield strength at the same downward pressure, thereby avoiding the problem of difficulty in forming caused by the large room temperature rolling downward pressure required to achieve the target yield strength.

[0030] The following is an exemplary description of a large-scale strain-hardened alloy arc segment shape collaborative manufacturing method provided by the present application in conjunction with a specific embodiment. Figure 1-Figure 3 shown.

[0031] Embodiment 1:

[0032] S1. Unrolling of steel coils: After unrolling, the 4.7mm thick solid solution thin plate stainless steel coils are sent to the unrolling machine through auxiliary rubber rollers for unrolling, ensuring that the plate is flat after unrolling, without wrinkles or other defects on the surface. The width of the steel coil is 1.5 m.

[0033] S2. Cryogenic treatment: The stainless steel plate after opening is transported to the cryogenic treatment box through a conveyor belt. The working length of the cryogenic box is 2 m. When the steel plate is completely in the cryogenic box, the conveyor belt stops running. Liquid nitrogen is sprayed in the cryogenic box to cool the stainless steel plate. The surface temperature of the steel plate is monitored by a temperature meter until the surface temperature of the steel plate reaches -196°C. Then, the conveyor belt is started to continue to transport the cryogenically treated steel plate forward.

[0034] S3, Rolling and bending: The steel plate that has been cryogenically treated is sent to the equal-diameter twin-roll mill through a conveyor belt. The diameter of the roller is 900 mm. The high-precision hydraulic servo system adjusts the distance between the upper and lower rollers in real time to control the rolling deformation, and the deformation is 15%. The upper and lower rollers are independently driven by a variable frequency motor to rotate. The rolling speed of the upper roller is 0.3 m / s, and the speed ratio is 1.04. Under the above-mentioned restrictions, the change law of the arc segment curvature radius during the rolling and bending process at different speed ratios is as follows Figure 3 As shown. After the plate leaves the rolling mill, two sets of mechanical clamps are suspended by an overhead crane to clamp the two sides of the arc segment to prevent the hardened stainless steel arc segment from being deformed or otherwise damaged due to its own weight. The arc length is measured by laser ranging. When the target arc length is reached, the steel plate is cut at the exit of the rolling mill. The curvature radius of the formed arc segment is 5.3m, the thickness is 4 mm, and the arc length is 16.64m. The state change process of the arc segment during the entire rolling and bending process from the beginning to the end is shown in the figure. Figure 4 shown.

[0035] S4. Hoisting transfer: Use a circular hoist with a diameter of 8m to fix the 6 points of the arc segment, flip the arc segment along the axial direction and then transfer it. The arc segment after flipping is perpendicular to the ground axially, and the points are evenly distributed along the circumference to ensure that the arc segment remains stable during the entire transfer process and avoid deformation caused by uneven local force.

[0036] Embodiment 2:

[0037] The difference between Example 2 and Example 1 is that in step S2, Example 2 performs rolling directly without performing cryogenic treatment.

[0038] Embodiment 3:

[0039] The difference between Example 3 and Example 1 is that in step S3, the speed ratio of the rollers in Example 3 is 1.

[0040] Embodiment 4:

[0041] The difference between Example 4 and Example 1 is that in step S3, the speed ratio of the rollers in Example 4 is 1.1.

[0042] Embodiment 5:

[0043] The difference between Example 5 and Example 1 is that in step S3, the speed ratio of the rollers in Example 5 is 1.25.

[0044] According to the common method in the art, samples were taken along the longitudinal direction of the arc segment to test the room temperature mechanical properties (yield strength, tensile strength, elongation) of the products of Examples 1-5 and the curvature radius of the arc segment after forming. The test results are shown in the following table:

[0045] By comparing Example 1 and Example 2, it can be seen that, at the same rolling pressure, deep cold pretreatment in step S2 can greatly improve the yield strength and tensile strength of the arc segment after forming, which means that a small rolling deformation under deep cold conditions can make the material reach a greater material strength obtained when the material is rolled and deformed at room temperature, which is conducive to reducing the forming force and thus reducing the forming difficulty. By comparing Example 1 with Example 3, Example 4 and Example 5, it can be seen that the speed ratio of the rolls in step S3 has the greatest influence on the curvature radius of the formed arc segment. When the speed ratio is too large, the plate will have a "roller wrap" phenomenon, and the arc segment curvature radius is consistent with the roll. The speed ratio of 1.04 selected in this Example 1 can obtain the optimal target curvature radius and higher mechanical properties.

[0046] In summary, this application provides a method for deep cold rolling and bending of large strain-hardened alloy arc segments, which is particularly suitable for manufacturing large-diameter tanks for heavy-duty launch vehicles. By introducing deep cold asynchronous conditions and optimizing rolling parameters, the coordinated manufacturing of arc segment performance and shape is achieved, providing a new solution for technological innovation in the aerospace field.

[0047] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for collaboratively manufacturing large-scale strain-hardened alloy arc segments, characterized in that: The following steps are involved: Coil unwinding: After unwinding, the coil is sent to the unwinding machine for unwinding. The thickness of the unwinding plate is 2mm-6mm and the width is 0.5mm-3m; Cryogenic treatment: The flattened plates are transported to the cryogenic treatment box, where liquid nitrogen is used to cool the plates until the surface temperature reaches -196°C. Rolling and bending: The plate that has been cryogenically treated is sent to the equal-diameter twin-roll mill. The diameter of the roll is 600mm-1500mm. The rolling deformation is controlled by adjusting the distance between the upper and lower rolls. The rolling deformation is 5%-30%. When the arc segment is formed, the downward pressure is determined by the mechanical performance requirements. Then, under the same downward pressure condition, the influence of different speed ratios on the curvature of the formed plate is determined by finite element simulation. The rolling speed of the roll is 0.1m / s-1.5m / s, and the speed ratio is greater than 1 and less than 1.

5. After the plate leaves the equal-diameter twin-roll mill, the arc length and curvature radius of the arc segment are monitored online using laser ranging. When the target arc length is reached, the plate is cut at the exit of the equal-diameter twin-roll mill. The curvature radius of the formed arc segment is 1m-8m, and the arc length of the formed arc segment is 1 / 8-1 / 2 of the equivalent circumference of the arc segment curvature.

2. The method for collaboratively manufacturing large-scale strain-hardened alloy arc segments according to claim 1, characterized in that: The cryogenic treatment specifically includes: conveying the flattened plate to a cryogenic treatment box via a conveyor belt, the working length range of the cryogenic treatment box is 0.5m-3m, cooling the plate by liquid nitrogen spraying in the cryogenic treatment box, and monitoring the surface temperature of the plate by a thermometer until the surface temperature of the plate reaches -196°C.

3. The large-scale strain-hardened alloy arc segment shape collaborative manufacturing method according to claim 2 is characterized in that: The plate has a thickness of 4.7 mm and a width of 1.5 m; the working length of the cryogenic treatment box is 2 m.

4. The large-scale strain-hardened alloy arc segment shape collaborative manufacturing method according to claim 1 is characterized in that: In the roll bending forming, the roll diameter is 900 mm, the rolling deformation is 15%, the rolling speed of the upper roll is 0.3 m / s, the speed ratio is 1.04, and the arc segment diameter after forming is 10.6 m.

5. The large-scale strain-hardened alloy arc segment shape collaborative manufacturing method according to claim 1, characterized in that: In the roll-bending forming, based on the material plastic deformation theory, the shear strain difference caused by the pressing amount and the speed ratio is quantified through finite element simulation, revealing its quantitative relationship with the curvature radius; for a single-pass process, the simulation directly predicts the control effect of the speed ratio and the rolling deformation on the curvature; When multiple forming passes are required due to excessive rolling deformation, the simulation simulates the progressive effect of the accumulated plastic strain on the curvature by loading the deformation in steps.

6. The large-scale strain-hardened alloy arc segment shape collaborative manufacturing method according to claim 1 is characterized in that: In the rolling bending process, the distance between the upper and lower rollers is adjusted in real time by the hydraulic servo system, and the error of the downward pressure is ±0.2mm; the speeds of the upper and lower rollers are independently driven by variable frequency motors, and the speed ratio control accuracy is ±0.

01.

7. The large-scale strain-hardened alloy arc segment shape collaborative manufacturing method according to claim 1, characterized in that: In the rolling and bending forming, after the plate leaves the equal-diameter twin-roll rolling mill, two sets of mechanical clamps are suspended by an overhead crane to clamp the two sides of the arc segment.

8. The method for collaboratively manufacturing large-scale strain-hardened alloy arc segments according to any one of claims 1 to 7, characterized in that: After the rolling and bending forming, the method further comprises: Hoisting and transfer: Use a circular hoist with a diameter of 1mm-13m to fix 5-10 points of the arc segment, flip the arc segment axially and then transfer it. The axis of the flipped arc segment is perpendicular to the ground, and the points are evenly distributed along the circumference to ensure that the arc segment remains stable during the entire transfer process and avoid deformation caused by local uneven force.

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