A Method for Co-Manufacturing the Shape and Property of a Large-Scale Strain-Hardening Alloy Arc Segment

Abstract

This application belongs to the field of metal rolling, and particularly relates to a collaborative manufacturing method for the shape and property of large-sized strain-strengthened alloy arc segments. By using cryogenic pretreatment combined with asynchronous rolling, large-sized stainless steel arc segments in a semi-hardened state are directly prepared. During the rolling and bending forming process, the velocity difference is used to induce asymmetric plastic deformation to achieve directional curvature control. Based on the calibrated curve of the reduction amount - speed ratio - curvature, online monitoring of the arc length and curvature radius is carried out with a laser rangefinder, and finally, precise control of the curvature radius is achieved. At the same time, considering the improvement effect of mechanical properties, the collaborative manufacturing of the properties and shape of the arc segments is realized. The entire technological process is short and efficient, reducing multiple intermediate steps compared with traditional methods, improving production efficiency and reducing production costs.

Description

Technical Field

[0001] This application relates to the technical field of metal rolling, and particularly to a collaborative manufacturing method for the shape and property of large-scale strain-strengthened alloy arc segments. Background Art

[0002] Launch vehicles play a crucial role in carrying out diverse deep-space exploration missions and are the cornerstone supporting China's manned spaceflight and deep-space exploration programs. Among them, the propellant tank, as a key component of the rocket, accounts for 60% of the total rocket mass. It is not only used to store propellants but also bears critical structural loads, having a decisive impact on improving the overall performance of the rocket. With the continuous increase in the requirements for the load-bearing capacity of launch vehicles, in order to maintain a reasonable slenderness ratio, the diameter of China's heavy launch vehicles is expected to be extended to the 10-meter level. In the commercial aviation field, the rocket diameter is usually in the range of 3 - 5 meters. Achieving lightweight by increasing material strength has become an important way to reduce costs. The application of high-strength materials can reduce the structural weight, thereby increasing the payload ratio, reducing fuel consumption, and lowering launch costs. The changes in structural dimensions and performance requirements pose new challenges to the manufacturing process of the arc-shaped barrel sections of future large launch vehicle propellant tanks.

[0003] Stainless steel and 5-series aluminum alloys have been widely used in many fields such as aerospace due to their excellent mechanical properties and corrosion resistance. Using stainless steel to manufacture rocket propellant tanks can not only significantly reduce material costs but also improve the overall performance of the product. However, 304L stainless steel and 5A06 aluminum alloy in their conventional states are difficult to meet the requirements of high-performance application scenarios such as launch vehicles due to their low strength. Although the semi-hardened stainless steel and aluminum alloy obtained by cold rolling deformation can significantly improve the material yield strength, their production costs are high, the processes are complex, and there are many problems. For example, it is difficult to perform the curling operation with a small radius of curvature on semi-hardened stainless steel, which may damage the equipment or pose 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 springback effect is significant during the roll bending process, making it difficult to control the curvature, and multiple trials or complex algorithms are required for compensation; residual stress may cause unpredictable deformation or failure during subsequent processing. In order to meet the performance and accuracy requirements of the arc segments, the traditional process method is usually to first improve the material strength through cold rolling treatment and then perform roll bending forming. This process method that separates forming and performance optimization has the problem of collaborative manufacturing of shape and property, and it is difficult to achieve ideal shape and performance simultaneously, further increasing costs and cycle times. Therefore, directly using cold-rolled semi-hardened stainless steel or aluminum alloy sheets for roll bending forming to manufacture the propellant tank arc segments faces both technical and economic challenges. Summary of the Invention

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

[0005] To achieve the above object, the present application provides a method for collaborative manufacturing of shape and property of large-scale strain-strengthened alloy arc segments, including the following steps:

[0006] Coil leveling: After uncoiling the coil, feed it into a leveler for leveling. The thickness of the leveled sheet is 2 mm - 6 mm, and the width is 0.5 mm - 3 m;

[0007] Cryogenic treatment: Transport the leveled sheet to a cryogenic treatment box, and use liquid nitrogen in the cryogenic treatment box to cool the sheet until the surface temperature of the sheet reaches -196°C;

[0008] Rolling and bending forming: Feed the sheet after cryogenic treatment into an equal-diameter double-roll mill. The diameter of the roll is 600 mm - 1500 mm. Control the rolling deformation amount by adjusting the distance between the upper and lower rolls. The rolling deformation amount is 5% - 30%. When forming the arc segment, determine the downward pressure according to the mechanical property requirements, and then determine the influence relationship between different speed ratios and the curvature of the formed sheet through finite element simulation under the same downward pressure condition. The rolling speed of the roll is 0.1 m / s - 1.5 m / s, and the speed ratio is greater than 1 and less than 1.5. After the sheet leaves the equal-diameter double-roll mill, use laser ranging to on-line monitor the arc length and curvature radius of the arc segment. When the target arc length is reached, cut the sheet at the outlet of the equal-diameter double-roll mill. The curvature radius of the formed arc segment is 1 m - 8 m, and the arc length of the formed arc segment is 1 / 8 - 1 / 2 of the equivalent circular circumference of the arc segment curvature.

[0009] Preferably, the cryogenic treatment specifically includes: Transport the leveled sheet to the cryogenic treatment box through a conveyor belt. The working length range of the cryogenic treatment box is 0.5 m - 3 m. Use liquid nitrogen spraying in the cryogenic treatment box to cool the sheet, and monitor the surface temperature of the sheet through a thermometer until the surface temperature of the sheet reaches -196°C.

[0010] Preferably, the thickness of the sheet is 4.7 mm and the width is 1.5 m; the working length of the cryogenic treatment box is 2 m.

[0011] Preferably, in the rolling and bending forming, the roll diameter is 900 mm, the rolling deformation amount is 15%, the rolling speed of the upper roll is 0.3 m / s, the speed ratio is 1.04, and the diameter of the formed arc segment is 10.6 m.

[0012] Preferably, in the roll bending forming, based on the material plastic deformation theory, the shear strain difference caused by the reduction and the speed ratio is quantified through finite element simulation, and its quantitative relationship with the curvature radius is revealed; for the single-pass process, the simulation directly predicts the control effect of the speed ratio and the rolling deformation amount on the curvature; when multi-pass forming is required due to excessive rolling deformation amount, the simulation simulates the progressive influence of the multi-pass cumulative plastic strain on the curvature by means of step-by-step loading of the deformation amount.

[0013] Preferably, in the roll bending forming, the distance between the upper and lower rolls is regulated in real time by a hydraulic servo system, and the reduction error is ±0.2 mm; the rotational speeds of the upper and lower rolls are independently driven by frequency conversion motors respectively, and the speed ratio control accuracy is ±0.01.

[0014] Preferably, in the roll bending forming, after the sheet leaves the equal-diameter twin-roll mill, two sets of mechanical clamps are hung by a crane to clamp both sides of the arc section.

[0015] Preferably, after the roll bending forming, it further includes:

[0016] Lifting and transferring: Use a circular sling with a diameter of 1 mm - 13 m to fix 5 - 10 points of the arc section, flip the arc section along the axial direction and then transfer it. After flipping, the axial direction of the arc section is perpendicular to the ground, and the points are evenly distributed along the circumferential direction to ensure that the arc section remains stable during the whole transfer process and avoid deformation caused by uneven local stress.

[0017] The beneficial effects of the large strain-strengthened alloy arc section shape-property collaborative manufacturing method provided by this application are as follows:

[0018] The curvature of the arc section of the strain-strengthened alloy (such as semi-hardened stainless steel, strain-hardened aluminum alloy) prepared by "cryogenic + asynchronous rolling" is significantly affected by the rolling reduction and the roll speed ratio. This application directly prepares a large-size stainless steel arc section in a semi-hardened state by cryogenic pretreatment combined with asynchronous rolling. During the roll bending forming process, the speed difference is used to induce asymmetric plastic deformation to achieve directional curvature control. Based on the calibrated reduction-speed ratio-curvature curve, the arc length and the curvature radius are monitored online by laser ranging, and finally, the precise control of the curvature radius of 1 m - 8 m is achieved. At the same time, considering the improvement effect of mechanical properties, the collaborative manufacturing of the arc section performance and shape is realized. The whole process flow is short and efficient, reducing multiple intermediate steps compared with the traditional method, improving the production efficiency and reducing the production cost; introducing cryogenic pretreatment before rolling can make the material obtain a higher yield strength at the same reduction, thus avoiding the problem of difficult forming caused by the large rolling reduction at room temperature required to reach the target yield strength. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Wherein:

[0021] Figure 1 is the process flow diagram of the large-scale strain-strengthened alloy arc-shaped formability collaborative manufacturing method shown in an embodiment of the present application;

[0022] Figure 2 is the influence law of the deformation amount and the speed ratio on the curvature of the arc plate during the roll bending forming process shown in an embodiment of the present application;

[0023] Figure 3 is the change law of the curvature radius of the arc segment during the roll bending forming process at different speed ratios under the conditions of a roll diameter of 900 mm, a deformation amount of 15%, and an upper roll speed of 0.3 m / s shown in an embodiment of the present application;

[0024] Figure 4 is the schematic diagram of the state change of the arc segment during the entire roll bending forming process from start to end using the large-scale strain-strengthened alloy arc-shaped formability collaborative manufacturing method shown in an embodiment of the present application. Detailed implementation manners

[0025] To facilitate the understanding of the present application, the following will describe the present application more comprehensively with reference to the relevant accompanying drawings. The preferred embodiments of the present application are given in the accompanying 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 content of the present application more thorough and comprehensive.

[0026] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the 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 their combinations.

[0027] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0028] Embodiments of the present application provide a large-scale strain-strengthened alloy arc-shaped formability collaborative manufacturing method, as Figure 1 shown, including the following steps:

[0029] Coil slitting: After uncoiling the coil, it is fed into a slitting machine for slitting. The thickness of the slit plate is 2 mm - 6 mm, and the width is 0.5 m - 3 m. It should be noted that when the thickness of the plate is less than 2 mm, it is difficult to meet the stiffness requirements of the rocket storage tank. When the thickness of the plate exceeds 6 mm, it is not conducive to achieving the weight reduction effect. When the width of the plate is less than 0.5 m, it will excessively increase the number of longitudinal welds of the storage tank, increasing the risk of fuel leakage. When the width of the plate is greater than 3 m, it will cause a significant increase in production costs due to the limitation of the width of the rolling mill.

[0030] Preferably, the thickness of the plate is 4.7 mm and the width is 1.5 m; the working length of the cryogenic treatment box is 2 m.

[0031] Cryogenic treatment: The slit plate is transported to a cryogenic treatment box, and liquid nitrogen is used to cool the plate in the cryogenic treatment box until the surface temperature of the plate reaches -196°C.

[0032] Among them, the cryogenic treatment specifically includes: transporting the slit plate to the cryogenic treatment box through a conveyor belt. The working length range of the cryogenic treatment box is 0.5 m - 3 m. It should be noted that when the working length of the cryogenic treatment box is less than 0.5 m, the forming efficiency will be too low, and when it is greater than 3 m, it is easy to cause uneven temperature distribution of the plate during the rolling process. In the cryogenic treatment box, the plate is cooled by spraying liquid nitrogen, and the surface temperature of the plate is monitored by a thermometer until the surface temperature of the plate reaches -196°C.

[0033] Roll bending forming: Feed the sheet metal after cryogenic treatment into an equal-diameter double-roll mill. The diameter of the rolls is 600 mm - 1500 mm. It should be noted that when the roll diameter is less than 600 mm, it is difficult to withstand high-load rolling deformation. When the roll diameter is greater than 1500 mm, edge thinning or surface scratching of the sheet metal is likely to occur, making it difficult to achieve high-precision control. Control the rolling deformation amount by adjusting the distance between the upper and lower rolls. The rolling deformation amount is 5% - 30%. The size of the deformation amount plays a decisive role in the mechanical properties of the formed arc section. When the deformation amount is less than 5%, the yield strength of the rolled sheet is relatively low and it is difficult to meet the mechanical property requirements. When the deformation amount is greater than 30%, the elongation of the material decreases, and the rolling force increases significantly, resulting in difficult forming. The deformation amount and the rotational speed difference (speed ratio) between the upper and lower rolls are the key factors determining the curvature of the arc section. Among them, the rotational speed of the upper roll is V1, the rotational speed of the lower roll is V2, and the definition of the speed ratio is V2 / V1. When the arc section bends towards the upper roll, the curvature is defined as positive, and vice versa, the curvature is negative. When the deformation amount is less than 20%, the curvature of the arc section is always positive, and the curvature of the arc section increases with the increase of the speed ratio. When the deformation amount is between 20% - 30%, the curvature of the arc section changes from negative curvature to positive curvature with the increase of the speed ratio. During arc section forming, determine the downward pressure according to the mechanical property requirements, and then under the condition of the same downward pressure, determine the influence relationship between different speed ratios and the curvature of the formed sheet metal through finite element simulation. The influence rules of the deformation amount and the speed ratio on the curvature of the arc plate during roll bending forming are as Figure 2 shown. The rolling speed of the rolls is 0.1 m / s - 1.5 m / s. Here it should be noted that when the rolling speed is less than 0.1 m / s, the cryogenically treated sheet metal is exposed for a long time, resulting in a temperature rise and reducing the effect of cryogenic rolling. When the rolling speed is greater than 1.5 m / s, the material does not have enough time for sufficient plastic flow, and surface cracks, edge warping, or internal residual stress concentration are likely to occur. The speed ratio is greater than 1 and less than 1.5. When the speed ratio is less than 1, the sheet metal is likely to bend downward and touch the ground, interfering with the normal operation of the rolling mill. When the speed ratio is greater than 1.5, the curvature of the sheet metal tends to be stable and no longer changes, and it is likely to cause surface cracks and affect the quality of the finished product. After the sheet metal leaves the equal-diameter double-roll mill, use laser ranging to on-line monitor the arc length and curvature radius of the arc section. When the target arc length is reached, cut the sheet metal at the outlet of the equal-diameter double-roll mill. The curvature radius of the formed arc section is 1 m - 8 m, and the arc length of the formed arc section is 1 / 8 - 1 / 2 of the equivalent circular circumference of the arc section curvature.

[0034] In roll bending forming, based on the material plastic deformation theory, quantify the shear strain difference caused by the downward pressure and the speed ratio through finite element simulation, and reveal its quantitative relationship with the curvature radius; for the single-pass process, the simulation directly predicts the control effect of the speed ratio and the rolling deformation amount on the curvature; when multi-pass forming is required due to excessive rolling deformation amount, the simulation simulates the progressive influence of multi-pass cumulative plastic strain on the curvature by loading the deformation amount step by step.

[0035] In roll bending forming, the distance between the upper and lower rolls is regulated in real time through a hydraulic servo system, and the error of the downward pressure is ±0.2 mm. The rotational speeds of the upper and lower rolls are independently driven by frequency conversion motors respectively, and the control accuracy of the differential speed ratio is ±0.01.

[0036] In roll bending forming, after the sheet metal leaves the equal-diameter twin-roll mill, two sets of mechanical fixtures are suspended by a crane to clamp both sides of the arc section, preventing the formed arc section from deforming or suffering other damages due to its own weight.

[0037] After roll bending forming, the following steps are further included:

[0038] Lifting and transferring: Use a circular sling with a diameter of 1 mm - 13 m to fix 5 - 10 points on the arc section, flip the arc section along the axial direction and then transfer it. After flipping, the axial direction of the arc section is perpendicular to the ground, and the points are evenly distributed along the circumferential direction, ensuring that the arc section remains stable during the entire transfer process and avoiding deformation caused by uneven local stress.

[0039] It should be noted that there have been a large number of reports in the academic community on using the method of "cryogenic + asynchronous rolling" to improve the mechanical properties of materials. However, the law of curvature change of the sheet metal after asynchronous rolling deformation is not clear, that is, it can only be "formed" but not "shaped". The arc curvature of strain-strengthened alloys (such as semi-hardened stainless steel and strain-hardened aluminum alloy) prepared by "cryogenic + asynchronous rolling" is significantly affected by the rolling downward pressure and the roll differential speed ratio.

[0040] In the embodiment of the present application, a semi-hardened large-size stainless steel arc section is directly prepared by combining cryogenic pretreatment and asynchronous rolling. During the roll bending forming process, the velocity difference is used to induce asymmetric plastic deformation to achieve directional curvature control. Based on the calibrated downward pressure - differential speed ratio - curvature curve, online monitoring of the arc length and curvature radius by laser ranging is used for dynamic compensation, and finally, precise control of the curvature radius of 1 m - 8 m is achieved. At the same time, considering the improvement effect of mechanical properties, the collaborative manufacturing of the arc section performance and shape is realized. The entire process flow is short and efficient, reducing multiple intermediate steps compared with the traditional method, improving production efficiency and reducing production costs; introducing cryogenic pretreatment before rolling can enable the material to obtain a higher yield strength at the same downward pressure, thus avoiding the problem of difficult forming caused by the large room temperature rolling downward pressure required to reach the target yield strength.

[0041] The following is an exemplary description of a method for collaborative manufacturing of the shape and properties of a large-scale strain-strengthened alloy arc section provided by the present application in combination with specific embodiments, as Figures 1-3 shown.

[0042] Example 1:

[0043] S1. Uncoiling and leveling of steel coil: After uncoiling a solution-annealed thin stainless steel steel coil with a thickness of 4.7 mm, it is fed into a leveler through auxiliary rubber rollers to ensure that the sheet after leveling is flat and has no wrinkles or other defects on the surface. The width of the steel coil is 1.5 m.

[0044] S2. Cryogenic treatment: The leveled stainless steel sheet is conveyed to a cryogenic treatment chamber through a conveyor belt. The working length of the cryogenic chamber is 2 m. When the sheet completely enters the cryogenic chamber, the conveyor belt stops running. The stainless steel sheet is cooled by spraying liquid nitrogen in the cryogenic chamber, and the surface temperature of the sheet is monitored by a thermometer until the surface temperature of the sheet reaches -196°C. Subsequently, the conveyor belt is started to continue conveying the cryogenically treated sheet forward.

[0045] S3. Roll bending and forming: The cryogenically treated sheet is fed into an equal-diameter double-roll mill through a conveyor belt. The diameter of the rolls is 900 mm. The distance between the upper and lower rolls is adjusted in real time by a high-precision hydraulic servo system to control the rolling deformation amount, and the deformation amount is 15%. The upper and lower rolls are independently driven by variable-frequency motors to rotate. The rolling speed of the upper roll is 0.3 m / s, and the differential speed ratio is 1.04. The change law of the arc curvature radius during the roll bending and forming process at different differential speed ratios under the above limiting conditions is as Figure 3 shown. After the sheet leaves the mill, two sets of mechanical clamps are hung by a crane to hold both sides of the arc section to prevent the hardened stainless steel arc section after forming from deforming or being damaged due to its own weight. The arc length of the arc section is measured by laser ranging. When the target arc length is reached, the sheet is cut at the mill outlet. The curvature radius of the formed arc section is 5.3 m, the thickness is 4 mm, and the arc length is 16.64 m. The state change process of the arc section during the entire roll bending and forming process from start to end is as Figure 4 shown.

[0046] S4. Lifting and transferring: A circular sling with a diameter of 8 m is used to fix 6 points of the arc section, and the arc section is axially flipped and then transferred. After flipping, the axis of the arc section is perpendicular to the ground, and the points are evenly distributed circumferentially to ensure that the arc section remains stable during the entire transfer process and avoid deformation caused by uneven local stress.

[0047] Example 2:

[0048] The difference between Example 2 and Example 1 is that in step S2, Example 2 does not perform cryogenic treatment and directly proceeds with rolling.

[0049] Example 3:

[0050] The difference between Example 3 and Example 1 is that in step S3, the differential speed ratio of the rolls in Example 3 is 1.

[0051] Example 4:

[0052] Example 4 is different from Example 1 in that in step S3, the roll speed difference ratio in Example 4 is 1.1.

[0053] Example 5:

[0054] Example 5 is different from Example 1 in that in step S3, the roll speed difference ratio in Example 5 is 1.25.

[0055] Detect the room temperature mechanical properties (yield strength, tensile strength, elongation) of the products of Examples 1 - 5 and the curvature radius of the arc section after forming by the common methods in the art along the longitudinal direction of the arc section. The test results are shown in the following table:

[0056]

[0057] Comparing Example 1 and Example 2, it can be seen that when the same rolling reduction is applied, deep cryogenic pretreatment in step S2 can significantly improve the yield strength and tensile strength of the formed arc section. This means that under deep cryogenic conditions, a small rolling deformation can make the material reach the material strength obtained at a larger room temperature rolling deformation, which is beneficial to reducing the forming force and thus the forming difficulty. Comparing Example 1 with Example 3, Example 4, and Example 5, it can be seen that the roll speed difference ratio in step S3 has the greatest influence on the curvature radius of the formed arc section. When the speed difference ratio is too large, the "roll wrapping" phenomenon will occur in the sheet, and the arc section curvature radius is the same as that of the roll. The speed difference ratio of 1.04 selected in this Example 1 can obtain the optimal target curvature radius and higher mechanical properties.

[0058] In summary, the present application provides a large - strain strengthening alloy arc section deep - cold rolling and bending forming method, which is particularly suitable for the manufacture of large - diameter storage tanks of heavy - lift launch vehicles. By introducing deep cryogenic asynchronous conditions and optimizing rolling parameters, the collaborative manufacturing of arc section performance and shape is realized, providing a new solution for technological innovation in the aerospace field.

[0059] The technical features of the above - mentioned embodiments can be combined arbitrarily. For the sake of brevity in description, not all possible combinations of the technical features in the above - mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0060] The above - mentioned embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended 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 1.5m-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 cryogenically treated plate is fed into an equal-diameter twin-roll mill, the diameter of the roll is 600mm-1500mm, and 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, 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 circumference of the equivalent circle of the arc segment curvature; in the rolling 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 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.

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 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.

6. The large-scale strain-hardened alloy arc segment shape collaborative manufacturing method according to claim 1 is 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.

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