A method for controlling the shape of aluminum cast and rolled plates

Abstract

This invention discloses a method for controlling the shape of aluminum cast and rolled plates, relating to the technical field of aluminum cast and rolled plate equipment. The main objective is to provide a method that can control the transverse thickness distribution of the cast and rolled plate into a gentle parabola, placing the billet shape within the optimal adjustment range for downstream processes. The main technical solution of this invention is as follows: A method for controlling the shape of aluminum cast and rolled plates, comprising the following steps: adjusting the width of the flow channel at the edge of the casting nozzle according to the width of the plate; adjusting the grinding angle of the casting rolls according to the width of the plate, so that the transverse thickness distribution of the rolled plate forms a slightly convex parabola; establishing and verifying a multiple regression model of the convexity; quantitatively pre-controlling the roll gap and rolling force on both sides to ensure consistent opening on both sides of the casting rolls and maintain a balance in the rolling force on both sides.

Description

Technical Field

[0001] This invention relates to the field of aluminum casting and rolling equipment technology, and in particular to a method for controlling the shape of aluminum casting and rolling plates. Background Technology

[0002] In the multi-process joint production of aluminum sheet, strip, and foil materials, sheet shape is one of the core quality indicators that determines the final product qualification rate. Long-term production practice and data traceability have revealed that the sheet shape of aluminum sheet, strip, and foil materials has significant heritability: the sheet shape characteristics of the cast and rolled billet will be inherited or even amplified in the subsequent cold rolling and foil rolling processes. Although cold rolling mills and foil rolling mills are equipped with sheet shape control methods such as bending rolls, tilting rolls, and segmented cooling, these methods are mainly used to eliminate the sheet shape deviations newly added during the rolling process, and their ability to correct the sheet shape defects carried by the upstream incoming materials is very limited.

[0003] Currently, the control of plate shape in the casting and rolling process in the industry still relies mainly on experience and lacks systematic process methods, especially for the following three types of casting and rolling plate shapes, where there is a lack of effective solutions:

[0004] First, edge warping during casting and rolling leads to edge loosening during cold rolling. The transverse thickness distribution of the cast-rolled plate is "W-shaped," meaning that the thickness of the two sides is significantly higher than that of the ribs. When such billets enter the cold rolling process, the rolling deformation is concentrated in the extra-thick area at the edges, and the edge elongation is greater than that of the ribs. Under the action of coiling tension, severe edge waviness is formed, i.e., "edge loosening," which may cause strip breakage during high-speed rolling.

[0005] Secondly, excessive convexity during casting and rolling leads to looseness in cold rolling. Excessive convexity in the cast and rolled sheet means the thickness at the center of the sheet far exceeds that at the edges. During cold rolling, deformation of such billets is concentrated in the center, with a greater elongation rate at the center than at the edges, forming a wavy shape in the middle, known as "looseness in the center." In severe cases, this can lead to a chain of quality problems such as wrinkling of the aluminum foil and uneven thickness.

[0006] Third, the uneven thickness of the cast-rolled wedge-shaped strip leads to single-sided looseness and delamination during cold rolling. The transverse thickness distribution of the cast-rolled strip is wedge-shaped, meaning that one side is consistently thicker than the other. When such billets enter the cold rolling process, the elongation of the thick side is greater than that of the thin side, forming a single-sided waviness, or "single-sided looseness." When the wedge shape is severe, the strip continuously deviates towards the thinner side during the cold rolling coiling process, causing interlayer misalignment, or "delamination," resulting in batch downgrading or even strip breakage and scrapping.

[0007] In the existing technology, the solution to the above three problems mainly relies on the operator's experience, lacking a systematic control method. This leads to large fluctuations and poor consistency in the shape of the cast and rolled plate during the early operation process, as well as frequent defects such as edge warping, excessive convexity, and wedge-shaped plates. Summary of the Invention

[0008] In view of this, the present invention provides a method for controlling the shape of aluminum cast and rolled plates. The main purpose is to provide a method for controlling the transverse thickness distribution of cast and rolled plates into a gentle parabola, so that the shape of the billet is within the optimal adjustment range of the downstream process.

[0009] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0010] This invention provides a method for controlling the shape of cast aluminum plates, the method comprising the following steps:

[0011] Adjust the width of the flow channel at the edge of the casting nozzle according to the width of the plate, and adjust the grinding angle of the casting roll according to the width of the plate, so that the transverse thickness distribution of the plate forms a slightly convex parabolic shape.

[0012] Establish and validate a multiple regression model for the convexity of the medium.

[0013] The roll gap and rolling force on both sides are quantitatively pre-controlled to ensure that the opening degree on both sides of the casting roll is consistent and that the rolling force on both sides is balanced.

[0014] As a further aspect of the present invention, the adjustment of the width of the flow distribution channel at the casting nozzle includes:

[0015] Adjust the channel width at the inner edge of the casting nozzle cavity from 60mm to 72mm to increase the aluminum supply to the plate ribs;

[0016] Adjust the rounded corners of the side passage exit to a 45-degree rounded transition.

[0017] As a further aspect of the present invention, the angle of the grinding angle of the casting rolls adjusted according to the width of the sheet metal includes:

[0018] When processing narrow plates, reduce the grinding angle and increase the taper slope to concentrate the roll crown in the middle;

[0019] When processing wide plates, increase the grinding angle and decrease the taper slope to make the thickness transition at the edges smoother.

[0020] As a further aspect of the present invention, the establishment and verification of the multivariate regression model for the convexity of the medium includes:

[0021] Analyze the factors affecting convexity in production data;

[0022] The estimated value is obtained by performing multiple linear regression on the production data. The formula for calculating the convexity is as follows:

[0023] ;

[0024] Where Y is the crown, in mm; C is the roll crown, in mm; W is the plate width, in mm; and F is the average rolling force, in tons.

[0025] The formula for calculating roll crown was derived by back-inferring from the multiple regression model as follows:

[0026] .

[0027] As a further aspect of the present invention, the quantitative pre-control of the roll gap and rolling force on both sides includes:

[0028] Before the upright plate, use a feeler gauge to measure the roll gap value on the operating side and the drive side respectively, and adjust the pressing device to control the difference in roll gap between the two sides to ≤0.01mm;

[0029] After the plate is erected and before production, the rolling force readings of the hydraulic cylinders on the operating and driving sides are monitored in real time, and the pressure on both sides is adjusted to control the rolling force to ≤ 50 tons.

[0030] As a further aspect of the present invention, the grinding angle ranges from sin55° to sin85°.

[0031] As a further aspect of the present invention: the plate shape is determined, and the transverse thickness distribution curve of the cast-rolled plate is a gentle parabola.

[0032] As a further aspect of the present invention, the transverse thickness distribution curve of the cast-rolled plate is a gently sloping parabola, including:

[0033] The difference between the edge thickness and the thickness at 100mm from the edge of the cast-rolled plate is ≤ 0.02mm;

[0034] The convexity value ranges from 0 to 0.03 mm;

[0035] The thickness difference between corresponding positions on the operating side and the drive side is ≤ 0.02mm;

[0036] The thickness difference between two adjacent measuring points is ≤ 0.02mm.

[0037] The beneficial effects of this invention are as follows:

[0038] This invention achieves dual coordinated control by adjusting the width of the flow channel at the edge of the casting nozzle and the angle of the grinding, thereby changing the transverse thickness distribution of the cast and rolled plate from a "W-shape" to a "gentle parabola". The edge overthickness is reduced from 0.04 mm to less than 0.01 mm, and the edge warping defect rate is reduced by more than 98%.

[0039] This invention uses a quantitative control model for roll crown with multiple production parameters to stabilize the actual crown value of the cast-rolled plate within the target range of 0-0.03mm, improving the control accuracy by more than 3 times compared to the traditional empirical method.

[0040] This invention achieves consistent opening on both sides of the casting roll and maintains a balance of rolling forces by quantitatively controlling the roll gap and rolling force on both sides, thereby reducing the defect rate of the wedge plate by more than 99%. Attached Figure Description

[0041] Figure 1 A flowchart of a method for controlling the shape of cast aluminum plates provided in an embodiment of the present invention;

[0042] Figure 2 A flowchart of another method for controlling the shape of cast aluminum plates provided in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram comparing data before and after the adjustment of the cast and rolled plate shape, provided as an embodiment of the present invention. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0045] like Figure 1 and Figure 3 As shown, this embodiment of the invention provides a method for controlling the shape of aluminum cast and rolled plates, the method comprising the following steps:

[0046] Adjust the width of the flow channel at the edge of the casting nozzle according to the width of the plate, and adjust the grinding angle of the casting roll according to the width of the plate, so that the transverse thickness distribution of the plate forms a slightly convex parabolic shape.

[0047] Establish and validate a multiple regression model for the convexity of the medium.

[0048] The roll gap and rolling force on both sides are quantitatively pre-controlled to ensure that the opening degree on both sides of the casting roll is consistent and that the rolling force on both sides is balanced.

[0049] The beneficial effects of this invention are as follows:

[0050] This invention achieves dual coordinated control by adjusting the width of the flow channel at the edge of the casting nozzle and the angle of the grinding, thereby changing the transverse thickness distribution of the cast and rolled plate from a "W-shape" to a "gentle parabola". The edge overthickness is reduced from 0.04 mm to less than 0.01 mm, and the edge warping defect rate is reduced by more than 98%.

[0051] This invention uses a quantitative control model for roll crown with multiple production parameters to stabilize the actual crown value of the cast-rolled plate within the target range of 0-0.03mm, improving the control accuracy by more than 3 times compared to the traditional empirical method.

[0052] This invention achieves consistent opening on both sides of the casting roll and maintains a balance of rolling forces by quantitatively controlling the roll gap and rolling force on both sides, thereby reducing the defect rate of the wedge plate by more than 99%.

[0053] Example 1

[0054] like Figure 1 and Figure 3 As shown, this embodiment of the invention provides a method for controlling the shape of aluminum cast and rolled plates, the method comprising the following steps:

[0055] 101. Adjust the width of the flow channel at the edge of the casting nozzle according to the width of the plate, and adjust the grinding angle of the casting roll according to the width of the plate, so that the transverse thickness distribution of the plate forms a slightly convex parabolic shape.

[0056] The widths of the plates are mainly 1020-1250mm, 1251-1480mm, 1481-1700mm, and 1701-1920mm. Adjusting the flow distribution of the casting nozzle alone can improve the aluminum supply to the ribs to some extent. However, when the edge warping is deep, flow distribution adjustment alone cannot completely eliminate the sudden change in edge thickness. Similarly, adjusting the grinding angle alone can optimize the edge thinning characteristics, but if the aluminum supply to the ribs is already insufficient, the effect of grinding adjustment will be greatly reduced. When the two are combined, the flow distribution adjustment ensures that the ribs receive sufficient aluminum liquid supply, and the grinding adjustment ensures that the edges receive a reasonable amount of thinning. The two are linked and matched, so that the transverse thickness distribution of the rolled plate changes from "W-shaped" to "slightly convex parabolic", fundamentally eliminating the edge warping defect.

[0057] 102. Establish and validate a multiple regression model for the convexity of the medium.

[0058] By systematically collecting and statistically analyzing production process parameters, a multiple regression prediction model for roll crown was established to determine the influence of each process parameter on roll crown, and the quantitative calculation formula for roll crown was derived in reverse.

[0059] 103. Quantitatively pre-control the roll gap and rolling force on both sides to ensure that the opening degree on both sides of the casting roll is consistent and that the rolling force on both sides is balanced.

[0060] To address the issue of cast-rolled wedge plates, quantitative pre-control of the roll gaps and rolling forces on both sides is implemented before the plate is erected, eliminating the conditions for wedge plate formation from both mechanical settings and process loading.

[0061] The beneficial effects of this invention are as follows:

[0062] This invention achieves dual coordinated control by adjusting the width of the flow channel at the edge of the casting nozzle and the angle of the grinding, thereby changing the transverse thickness distribution of the cast and rolled plate from a "W-shape" to a "gentle parabola". The edge overthickness is reduced from 0.04 mm to less than 0.01 mm, and the edge warping defect rate is reduced by more than 98%.

[0063] This invention uses a quantitative control model for roll crown with multiple production parameters to stabilize the actual crown value of the cast-rolled plate within the target range of 0-0.03mm, improving the control accuracy by more than 3 times compared to the traditional empirical method.

[0064] This invention achieves consistent opening on both sides of the casting roll and maintains a balance of rolling forces by quantitatively controlling the roll gap and rolling force on both sides, thereby reducing the defect rate of the wedge plate by more than 99%.

[0065] Example 2

[0066] like Figure 2 and Figure 3 As shown, this embodiment of the invention provides a method for controlling the shape of aluminum cast and rolled plates, the method comprising the following steps:

[0067] 201. Adjust the width of the channel at the inner edge of the casting nozzle cavity from 60mm to 72mm to increase the aluminum supply to the plate ribs.

[0068] The casting nozzle is the final flow channel distributor before the molten aluminum enters the roll gap of the casting plate. Extensive production verification has shown that the width of the edge channel of the casting nozzle directly affects the aluminum supply to the ribs and the thickness of the ribs in the casting plate. When the edge channel is too narrow, the aluminum supply to the ribs is insufficient, resulting in a thick edge and a thin rib, forming a warped edge. Specifically, when the width is 1020-1250mm, the width of the channel at the inner edge of the casting nozzle cavity should be adjusted by 60mm; when the width is 1251-1480mm, the width should be adjusted by 64mm; when the width is 1481-1700mm, the width should be adjusted by 68mm; and when the width is 1701-1920mm, the width should be adjusted by 72mm.

[0069] 202. Adjust the rounded corners of the edge passage exit to a 45-degree rounded transition.

[0070] The corner of the edge channel outlet is rounded to 45° to make the flow of molten aluminum at the edge smoother and avoid sudden changes in thickness caused by local turbulence.

[0071] 203. When processing narrow plates, reduce the grinding angle and increase the slope of the conical surface to concentrate the roll crown in the middle.

[0072] The grinding angle of the casting rolls directly affects the thinning characteristics of the edge of the cast-rolled plate. The grinding angle determines the effective distribution width of the roll crown, thus having diametrically opposed effects on narrow and wide plate types. Specifically, when the grinding angle is close to sin90°, the grinding curve tends to be a complete sine wave, and the crown extends gently to the edge of the roll body, resulting in a uniform and continuous rolling force distribution across the entire width of the wide plate. When the grinding angle is close to sin45°, the crown contracts sharply and concentrates in the middle of the roll. The two sides quickly become straight, which can provide strong rolling force in the middle of narrow plates. However, if it is mistakenly used for wide plates, the roll body edge will have almost no convexity and cannot compensate for the elastic flattening and thermal expansion of the wide plate, resulting in a sudden drop in the force in the edge area and inducing excessive thickness at the edge. Therefore, the grinding angle is adjusted to sin55° to sin85° according to different widths. For narrow plates, the grinding angle is reduced and the cone slope is increased so that the roll convexity is concentrated in the middle, which is conducive to the rolling deformation in the middle of the plate.

[0073] 204. When processing wide plates, increase the grinding angle and decrease the taper slope to make the thickness transition at the edges smoother.

[0074] For wide plates, increase the grinding angle and decrease the taper slope to make the thickness transition at the edge smoother and eliminate abrupt changes in edge thickness.

[0075] It should be noted that while adjusting the flow distribution of the casting nozzle can improve the aluminum supply to the ribs to some extent, when the edge warping is severe, flow distribution adjustment alone cannot completely eliminate the abrupt change in edge thickness. Adjusting the grinding angle alone can optimize the edge thinning characteristics, but if the aluminum supply to the ribs is already insufficient, the effect of grinding adjustment will be greatly reduced. When the two are used in conjunction, flow distribution adjustment ensures that the ribs receive a sufficient supply of molten aluminum, while grinding adjustment ensures that the edges receive a reasonable amount of thinning. The two work together to transform the transverse thickness distribution of the rolled plate from a "W-shape" to a "slightly convex parabolic shape," fundamentally eliminating the edge warping defect.

[0076] 205. Analyze the factors affecting convexity in production data.

[0077] Through systematic data collection and statistical analysis of production process parameters, the relationship between various influencing factors and roll crown is shown in Table 1. Among them, the influencing factors include roll crown, plate width, rolling force, main machine speed, casting and rolling zone length, hot roll gap, roll diameter and front box temperature. In the relationship with roll crown, roll crown, plate width, rolling force and casting and rolling zone length are positively correlated factors.

[0078]

[0079] Table 1

[0080] 206. The estimated value is obtained by performing multiple linear regression on the production data. The formula for calculating the convexity is as follows:

[0081] ;

[0082] Where Y is the crown, in mm; C is the roll crown, in mm; W is the plate width, in mm; and F is the average rolling force, in tons.

[0083] By performing multiple linear regression on production data, mainly using the least squares method, the estimated values ​​of each coefficient are obtained. For variables with low significance (p>0.1), the model can be simplified to retain the core variables and obtain the formula for calculating the convexity.

[0084] 207. To verify the multiple regression model, the formula for calculating roll crown is derived by reverse inference as follows:

[0085] .

[0086] The model was validated using 200 sets of reserved production data. The average absolute error between the predicted and actual roll crown was 0.002 mm, and the maximum error did not exceed 0.005 mm, indicating that the model has good prediction accuracy. Then, the formula for calculating roll crown was derived by reverse engineering. The model has a determination coefficient R² = 0.89, which can solve 89% of the convexity change adjustment cases;

[0087] The model application examples are shown in Table 2. Taking the target convexity (0~0.03) mm as an example: the convexity of the plate obtained in 5 actual productions is within the control target range.

[0088]

[0089] Table 2

[0090] 208. Before the upright plate is erected, use a feeler gauge to measure the roll gap value on the operating side and the drive side respectively, and adjust the pressing device to control the difference between the roll gaps on both sides to ≤0.01mm.

[0091] Before erecting the plate, the roll gap values ​​on the operating side and the drive side are measured using a feeler gauge with an accuracy of 0.01mm. The difference in roll gap between the two sides is controlled to ≤0.01mm by adjusting the pressing device. This ensures that the opening degree on both sides of the casting roll is consistent, eliminating the root cause of wedge shape from a mechanical structural perspective.

[0092] 209. After the plate is erected and before production, monitor the rolling force readings of the hydraulic cylinders on the operating and driving sides in real time, adjust the pressure on both sides, and control the rolling force to ≤ 50 tons.

[0093] After the plate is erected and before normal production begins, the rolling force readings of the hydraulic cylinders on the operating and driving sides are monitored in real time. The difference in rolling force is controlled to be ≤ 50 tons by adjusting the pressing force on both sides. This ensures that the rolling force on both sides is balanced and eliminates wedge-shaped plates caused by uneven force.

[0094] It should be noted that controlling only the uniformity of the roll gap while ignoring the rolling force balance is not sufficient. After the plate is erected, changes in temperature field and lubrication conditions may still cause an imbalance in the actual rolling force on both sides, leading to a wedge shape. Controlling only the rolling force balance while ignoring the uniformity of the roll gap means that the structural deviation at the mechanical level is not eliminated, and the rolling force balance is merely a compensation for the error, with unstable effects. When both are used in conjunction, the uniform roll gap ensures structural symmetry, and the rolling force balance ensures symmetrical loading. Both are indispensable, fundamentally eliminating the conditions for wedge plate formation. The above-mentioned roll gap difference ≤ 0.01mm and rolling force difference ≤ 50 tons are based on statistical analysis of a large amount of production data. When the roll gap difference exceeds 0.01mm, the thickness difference on both sides of the cast and rolled plate begins to increase significantly (>0.02mm); when the rolling force difference exceeds 50 tons, the wedge plate defect rate rises sharply.

[0095] 210. Plate type judgment: The transverse thickness distribution curve of cast and rolled plate is a gentle parabola.

[0096] As shown in Table 4, the criteria for judging a good cast-rolled plate type are: the transverse thickness distribution curve of the cast-rolled plate should be a gentle parabola, and the curve should simultaneously meet the following four quantitative indicators:

[0097] The difference between the edge thickness and the thickness at 100mm from the edge of the cast-rolled plate is ≤ 0.02mm;

[0098] The convexity value ranges from 0 to 0.03 mm;

[0099] The thickness difference between corresponding positions on the operating side and the drive side is ≤ 0.02mm;

[0100] The thickness difference between two adjacent measuring points is ≤ 0.02mm.

[0101]

[0102] Table 4

[0103] like Figure 3 As shown, a good plate shape with a slight parabola that meets the above four indicators can be judged as a qualified plate shape. If any indicator fails to meet the standard, the plate shape is considered unqualified, and the corresponding process parameters need to be adjusted retrospectively.

[0104] The beneficial effects of this invention are as follows:

[0105] This invention achieves dual coordinated control by adjusting the width of the flow channel at the edge of the casting nozzle and the angle of the grinding, thereby changing the transverse thickness distribution of the cast and rolled plate from a "W-shape" to a "gentle parabola". The edge overthickness is reduced from 0.04 mm to less than 0.01 mm, and the edge warping defect rate is reduced by more than 98%.

[0106] This invention uses a quantitative control model for roll crown with multiple production parameters to stabilize the actual crown value of the cast-rolled plate within the target range of 0-0.03mm, improving the control accuracy by more than 3 times compared to the traditional empirical method.

[0107] This invention achieves consistent opening on both sides of the casting roll and maintains a balance of rolling forces by quantitatively controlling the roll gap and rolling force on both sides, thereby reducing the defect rate of the wedge plate by more than 99%.

[0108] This invention replaces traditional subjective experience evaluation with multi-dimensional quantitative indicators through judgment criteria, giving pattern control a comprehensive, clear, and quantifiable objective, and significantly improving the consistency and stability of pattern among different shifts and production lines.

[0109] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the shape of cast and rolled aluminum sheets, characterized in that, Includes the following steps: Adjust the width of the flow channel at the edge of the casting nozzle according to the width of the plate, and adjust the grinding angle of the casting roll according to the width of the plate, so that the transverse thickness distribution of the plate forms a slightly convex parabolic shape. Establish and validate a multiple regression model for the convexity of the medium. The roll gap and rolling force on both sides are quantitatively pre-controlled to ensure that the opening degree on both sides of the casting roll is consistent and that the rolling force on both sides is balanced.

2. The method for controlling the shape of aluminum cast and rolled plates according to claim 1, characterized in that, The adjustment of the width of the flow distribution channel at the casting nozzle includes: Adjust the channel width at the inner edge of the casting nozzle cavity from 60mm to 72mm to increase the aluminum supply to the plate ribs; Adjust the rounded corners of the side passage exit to a 45-degree rounded transition.

3. The method for controlling the shape of aluminum cast and rolled plates according to claim 1, characterized in that, The angle for adjusting the grinding angle of the casting rolls according to the width of the sheet metal includes: When processing narrow plates, reduce the grinding angle and increase the taper slope to concentrate the roll crown in the middle; When processing wide plates, increase the grinding angle and decrease the taper slope to make the thickness transition at the edges smoother.

4. The method for controlling the shape of aluminum cast and rolled plates according to claim 1, characterized in that, The establishment and verification of the multivariate regression model for the convexity of the medium includes: Analyze the factors affecting convexity in production data; The estimated value is obtained by performing multiple linear regression on the production data. The formula for calculating the convexity is as follows: Y=-0.023+0.32*C+0.000022*W+0.000035*F; Where Y is the crown, in mm; C is the roll crown, in mm; W is the plate width, in mm; and F is the average rolling force, in tons. The formula for calculating roll crown was derived by back-inferring from the multiple regression model as follows: C=(Y+0.023-0.000022*W-0.000035*F) / 0.

32.

5. The method for controlling the shape of aluminum cast and rolled plates according to claim 1, characterized in that, The quantitative pre-control of the roll gap and rolling force on both sides includes: Before the upright plate, use a feeler gauge to measure the roll gap value on the operating side and the drive side respectively, and adjust the pressing device to control the difference in roll gap between the two sides to ≤0.01mm; After the plate is erected and before production, the rolling force readings of the hydraulic cylinders on the operating and driving sides are monitored in real time, and the pressure on both sides is adjusted to control the rolling force to ≤ 50 tons.

6. The method for controlling the shape of aluminum cast and rolled plates according to claim 3, characterized in that, The grinding angle ranges from sin55° to sin85°.

7. A method for controlling the profile of aluminum cast and rolled plates according to any one of claims 1 to 6, characterized in that, Also includes: Based on plate type, the transverse thickness distribution curve of the cast-rolled plate is a gentle parabola.

8. The method for controlling the shape of aluminum cast and rolled plates according to claim 7, characterized in that, The transverse thickness distribution curve of the cast-rolled plate is a gently curving parabola, including: The difference between the edge thickness and the thickness at 100mm from the edge of the cast-rolled plate is ≤ 0.02mm; The convexity value ranges from 0 to 0.03 mm; The thickness difference between corresponding positions on the operating side and the drive side is ≤ 0.02mm; The thickness difference between two adjacent measuring points is ≤ 0.02mm.

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