A casting process for producing a 1-series aluminum alloy

Abstract

The present application relates to the technical field of aluminum alloy ingot production, and more particularly to a 1-series aluminum alloy production casting process, which comprises pouring liquid aluminum into a crystallizer in a casting machine and introducing cooling water into the crystallizer; as the casting length K gradually increases, the casting speed is linearly increased from an initial casting speed to a steady-state casting speed, and the cooling water flow is linearly increased from an initial cooling water flow to a steady-state cooling water flow; the difference between the steady-state casting speed and the initial casting speed is 15-20 mm / min, the ratio of the initial cooling water flow to the steady-state cooling water flow is (0.4-0.6):1; and the steady-state casting speed is 50-60 mm / min. By linearly increasing the casting speed from an initial value to a steady-state value and simultaneously adjusting the cooling water flow in proportion, the present application effectively avoids defects such as cold shut and cracks caused by uneven cooling, and improves the surface quality of the aluminum alloy ingot.

Description

Technical Field

[0001] This invention relates to the technical field of aluminum alloy ingot production, and more specifically, to a casting process for producing 1-series aluminum alloys. Background Technology

[0002] 1-series aluminum alloys, also known as industrial pure aluminum, contain ≥99.0% aluminum and possess advantages such as low density and good electrical and thermal conductivity. Due to the high sensitivity of 1-series aluminum alloys to casting performance, they are more prone to quality defects such as cracks and cold shuts, especially for higher purity grades, where the economic losses from these defects are greater. The casting start-up process refers to the design of the combination of casting speed and cooling water flow from the beginning of casting to the stable casting process. This is crucial for ensuring stable ingot formation and good appearance quality. Currently, the casting start-up process in 1-series aluminum alloy production is relatively crude, which is one of the main reasons for the poor surface appearance quality of 1-series aluminum alloy ingots and the appearance of defects such as cold shuts and cracks. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing casting start-up process, which is relatively rough and results in poor surface appearance quality of 1-series aluminum alloy ingots. This invention provides a casting process for 1-series aluminum alloy production, which improves the surface quality of aluminum alloy ingots by precisely controlling the casting speed and cooling water flow during the casting start-up process.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A casting process for producing 1-series aluminum alloys is provided, including the following steps: Molten aluminum is poured into the crystallizer of the casting machine, and cooling water is introduced into the crystallizer; as the casting length K gradually increases, the casting speed... The cooling water flow rate V increases linearly from the initial casting speed to the steady-state casting speed. w The initial cooling water flow rate is linearly increased to the steady-state cooling water flow rate; the difference between the steady-state casting speed and the initial casting speed is 15~20 mm / min, the ratio of the initial cooling water flow rate to the steady-state cooling water flow rate is (0.4~0.6):1; the steady-state casting speed is 50~60 mm / min.

[0005] The 1-series aluminum alloy production casting process of this invention optimizes the casting start-up process and simultaneously controls the casting speed and cooling water flow rate within a certain range during steady-state operation: the initial casting speed is controlled to differ from the steady-state casting speed by 15-20 mm / min, and the steady-state casting speed is set at 50-60 mm / min. This ensures the aluminum liquid spreads smoothly within the crystallizer, preventing turbulence that could lead to surface cold shuts. The linear speed increase ensures a smooth advancement of the solidification front, reducing thermal stress concentration. The initial cooling water flow rate is low, only 40%-60% of the steady-state flow rate, preventing excessively rapid cooling of the aluminum liquid that could cause surface shrinkage and cracking. As the casting speed increases, the cooling water flow rate increases linearly and synchronously, ensuring the solidification rate matches the casting speed. This process effectively avoids defects such as cold shuts and cracks caused by uneven cooling, improving the surface quality of the aluminum alloy ingots.

[0006] Preferably, when the casting length K is less than or equal to 300 mm, the cooling water flow rate V w Satisfy the following formula:

[0007] Where D is the ingot thickness, L is the ingot width, V is the casting speed, and α is the cooling water flow control parameter, 1.4 × 10⁻⁶. -6 ≤α≤2.1×10 -6 , Adjust the cooling water flow rate parameters to ensure that 0.9 ≤ ≤1.1. A dynamic calculation formula for cooling water flow rate is introduced to achieve precise matching between cooling water flow rate and ingot size and casting speed in the critical forming stage where casting length K≤300mm. This optimizes the thermal balance process in the solidification stage, effectively suppresses cold shuts and cracks caused by uneven cooling, and significantly improves the surface quality and internal structure uniformity of 1-series aluminum alloy ingots.

[0008] Introducing a cooling water flow rate calculation formula during the casting start-up stage, combined with the α parameter gradient setting for different length ranges, ensures dynamic adaptation between cooling water flow rate and casting speed, which can further reduce thermal stress concentration.

[0009] Preferably, when the casting length K is equal to 0 mm, the casting speed is... The cooling water flow rate control parameter is 35~40 mm / min. It is 1.49 10 -6 In the initial stage when the casting length is 0, the casting speed is controlled within a low range of 35~40 mm / min, and is used in conjunction with 1.49 10 -6 Cooling water flow control parameters This allows the molten aluminum to spread smoothly and solidify uniformly in the crystallizer, effectively avoiding surface shrinkage and cracking caused by rapid cooling. This lays a good foundation for the stable progress of the subsequent casting process and significantly improves the initial forming quality of the ingot.

[0010] Preferably, when the casting length K is equal to 100 mm, the casting speed is... The cooling water flow rate control parameter is 40~45 mm / min. It is 1.76 10 -6 When the casting length K reaches 100mm, the casting speed is increased to 40~45mm / min and a 1.76mm / min casting speed is adopted. 10 -6 Cooling water flow control parameters This allows the molten aluminum to maintain good fluidity while achieving a moderate cooling intensity, avoiding cold shut defects caused by excessively rapid cooling, and realizing an optimized transition in the surface quality and internal structure of the ingot, providing a reliable guarantee for the smooth progress of subsequent casting processes.

[0011] Preferably, when the casting length K is equal to 200 mm, the casting speed is... The cooling water flow rate control parameter is 45~50 mm / min. It is 1.89 10 -6 When the casting length K reaches 200mm, the casting speed is increased to 45~50mm / min and a 1.89mm casting speed is used. 10 -6 Cooling water flow control parameters This achieves a precise match between the solidification front and the casting speed. This parameter combination maintains a suitable cooling gradient to prevent thermal stress cracking and avoids surface defects that are prone to occur in the casting start-up stage of 1-series aluminum alloys.

[0012] Preferably, when the casting length K is equal to 300 mm, the casting speed is... The cooling water flow rate control parameter is 50~55 mm / min. It is 1.96 10 -6 When the casting length K reaches 300mm, the casting speed is increased to 50~55mm / min and a 1.96mm / min casting speed is adopted. 10 -6 Cooling water flow control parameters This enables a smooth transition from the initial casting stage to the steady-state casting stage. This parameter combination ensures the formation of a complete and uniform solidification layer on the ingot surface, giving the ingot excellent surface finish before entering the steady-state casting stage, thus laying a solid foundation for subsequent high-quality continuous casting.

[0013] Preferably, when the casting length is greater than 300mm, the casting speed is the steady-state casting speed, and the cooling water flow rate is the steady-state cooling water flow rate. When the casting length exceeds 300mm, i.e., when entering the steady-state casting stage, maintaining the steady-state water flow rate achieves a balance between production efficiency and product quality, maintains a stable solidification front, and ensures that large-size 1-series aluminum alloy ingots maintain excellent surface finish throughout the continuous casting process, significantly improving production stability and product qualification rate.

[0014] Preferably, the cooling water temperature is 15~35℃. Controlling the cooling water temperature within the range of 15~35℃ helps maintain a stable cooling rate, avoids insufficient cooling due to excessively high water temperature or sudden cooling due to excessively low water temperature, thereby balancing the thermal stress during the solidification process of the ingot, reducing the generation of surface cold shuts and cracks, and improving the overall surface quality of the ingot.

[0015] Preferably, the crystallizer is rectangular in shape and includes a first crystallization surface and a second crystallization surface connected to each other. The width of the first crystallization surface is greater than that of the second crystallization surface. Cooling water channels are provided on both the first and second crystallization surfaces. The first crystallization surface includes a first cooling zone, a second cooling zone, and a third cooling zone. The first cooling zone is located at the center of the first crystallization surface. The two ends of the second cooling zone are connected to the first and third cooling zones, respectively. The second crystallization surface includes a fourth cooling zone and a fifth cooling zone. The fifth cooling zone is located at the center of the second crystallization surface and is connected to the fourth cooling zone, respectively. The cooling water flow rate of the first cooling zone is the same as that of the fifth cooling zone and is 1.3 to 1.7 times that of the third cooling zone. The cooling water flow rate of the second cooling zone is 1.8 to 2.2 times that of the third cooling zone. The cooling water flow rate of the fourth cooling zone is the same as that of the third cooling zone. In this invention, the cooling water flow rate can be adjusted by controlling the number and diameter of the cooling water holes in each cooling zone, so that different cooling water flow rates are maintained between the cooling zones, providing different cooling rates at different locations of solidification. This invention utilizes a zoned cooling design in a rectangular crystallizer, with three cooling zones on the first crystallization surface (long side) and two cooling zones on the second crystallization surface (short side), achieving precise control of the three-dimensional temperature field of the ingot. This design effectively balances the cooling differences between the long and short sides, ensuring uniform solidification rates across all parts of the ingot. It can control the thickness and width deviations of flat ingots to within 3 mm and the curvature to within 4 mm, significantly improving the dimensional accuracy and shape stability of 1-series aluminum alloy ingots and solving the ingot deformation problem caused by uneven cooling in traditional casting processes.

[0016] The first and second crystallization surfaces of the rectangular crystallizer are divided into five cooling zones. By distributing cooling water flow rates differently, the problem of the difference in cooling rate between the edge and center of large-sized ingots is solved, further suppressing crack formation.

[0017] Preferably, the crystallizer includes a first crystallization surface and a second crystallization surface that are interconnected. Both the first and second crystallization surfaces have connecting and non-connecting areas. The non-connecting areas are connected to the connecting areas on both sides, and the depth difference between the non-connecting and connecting areas is 10-20 mm. By setting connecting and non-connecting areas with a depth difference of 10-20 mm on the first and second crystallization surfaces of the crystallizer, a gradient cooling structure is formed, avoiding cold shut defects caused by excessively rapid local cooling, and significantly improving the surface forming quality of 1-series aluminum alloy ingots.

[0018] Preferably, the crystallizer is an aluminum crystallizer with a depth of 90-150 mm. Using an aluminum crystallizer with a depth of 90-150 mm fully utilizes the advantage of aluminum's high thermal conductivity, achieving more efficient heat dissipation compared to traditional copper crystallizers. In actual production, a lower liquid level can be used for casting, significantly reducing the risk of surface defects caused by liquid level fluctuations. This results in a smoother and denser surface quality for the ingot, while also avoiding cold shuts caused by excessively rapid cooling. This provides a reliable process guarantee for the high-quality production of 1-series aluminum alloy ingots.

[0019] Compared with the prior art, the beneficial effects of the present invention are: The process of this invention effectively avoids defects such as cold shuts and cracks caused by uneven cooling, and improves the surface quality of aluminum alloy ingots. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the crystallizer. Figure 2 This is a schematic diagram of the structure of the first crystallization plane; Figure 3 This is a schematic diagram of the structure of the second crystallization plane; Figure 4 This is a schematic diagram of the appearance of the aluminum alloy ingot in Example 1; Figure 5 This is a schematic diagram of the appearance of the aluminum alloy ingot in Example 2; Figure 6 This is a schematic diagram of the appearance of the aluminum alloy ingot in Example 3; Figure 7 This is a schematic diagram of surface defects in the aluminum alloy ingot in Comparative Example 1. Figure 8 This is a schematic diagram of surface defects in the aluminum alloy ingot in Comparative Example 2. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments.

[0022] Example 1 This embodiment is the first embodiment of the casting process for producing 1-series aluminum alloys, including the following steps: (1) Add the prepared raw materials to the smelting furnace for melting. The aluminum content in the smelting furnace is greater than 99.0%. (2) Pour out the molten aluminum from the smelting furnace and let it flow through the degassing chamber and filter box for degassing and filtration; (3) Pour the molten aluminum into the mold cavity of the crystallizer and introduce cooling water into the cooling water channel of the crystallizer; as the casting length K gradually increases, the casting speed increases linearly from the initial casting speed of 38 mm / min to the steady-state casting speed of 55 mm / min, and the cooling water flow rate increases from the initial cooling water flow rate of 49.8 m 3 The cooling water flow rate increases linearly to a steady-state 94.8 m³ / h. 3 / h; the difference between the steady-state casting speed and the initial casting speed is 17mm / min, and the ratio of the initial cooling water flow rate to the steady-state cooling water flow rate is 0.52:1.

[0023] In this embodiment, the above method is used to produce 1-series aluminum alloy ingots with casting specifications of 1600mm×550mm. The casting start-up process parameters used in step (3) of this embodiment are shown in Table 1, where the ingot thickness is... Ingot width , The casting speed is 55 mm / min, with a steady-state casting speed of 55 mm / min. Cooling water flow control parameters, cooling water flow adjustment parameters The cooling water temperature was 25℃, and the appearance of the aluminum alloy ingot obtained after casting was as follows. Figure 4 As shown.

[0024] Table 1. Casting start-up process parameters for Example 1

[0025] like Figure 1 , Figure 2 , Figure 3As shown, the crystallizer in this embodiment is rectangular in shape and includes a first crystallization surface and a second crystallization surface that are connected to each other. The width of the first crystallization surface is greater than that of the second crystallization surface. Cooling water channels are provided on both the first and second crystallization surfaces. The first crystallization surface includes a first cooling zone, a second cooling zone, and a third cooling zone. The first cooling zone is located at the center of the first crystallization surface. The two ends of the second cooling zone are connected to the first and third cooling zones, respectively. The second crystallization surface includes a fourth cooling zone and a fifth cooling zone. The fifth cooling zone is located at the center of the second crystallization surface and is connected to the fourth cooling zone, respectively. The cooling water flow rate of the first cooling zone is the same as that of the fifth cooling zone and is 1.5 times that of the third cooling zone. The cooling water flow rate of the second cooling zone is 2.0 times that of the third cooling zone. The cooling water flow rate of the fourth cooling zone is the same as that of the third cooling zone. In this invention, the cooling water flow rate can be adjusted by controlling the number and diameter of the cooling water holes in each cooling zone, so that different cooling water flow rates are maintained between the cooling zones, providing different cooling rates at different locations of solidification. This invention achieves precise control of the three-dimensional temperature field of the ingot through the partitioned cooling design of the rectangular crystallizer.

[0026] like Figure 1 As shown, in this embodiment, the ratio of the width D1 of the first cooling zone to the width L1 of the first crystallization surface is 1:4; the ratio of the width D2 of the second cooling zone to the width L1 of the first crystallization surface is 1:4; the ratio of the width D3 of the third cooling zone to the width L1 of the first crystallization surface is 1:8; the ratio of the width D4 of the fourth cooling zone to the width L2 of the second crystallization surface is 3:8; and the ratio of the width D5 of the fifth cooling zone to the width L2 of the second crystallization surface is 1:4. In this embodiment, one first cooling zone, two second cooling zones, and two third cooling zones are provided on the first crystallization surface. The second cooling zones are respectively located on both sides of the first cooling zone. The total width of the second cooling zone is 2D2, and the ratio of the total width 2D2 of the second cooling zone to the width L1 of the first crystallization surface is 1:2. The total width of the third cooling zone is 2D3, and the ratio of the total width 2D3 of the third cooling zone to the width L1 of the first crystallization surface is 1:4. In this embodiment, two fourth cooling zones and one fifth cooling zone are provided on the second crystal surface. The fourth cooling zones are respectively located on both sides of the fifth cooling zone. The total width of the fourth cooling zone is 2D4, and the ratio of the total width of the fourth cooling zone 2D4 to the width L2 of the second crystal surface is 3:4.

[0027] like Figure 2 , Figure 3As shown, in this embodiment, both the first and second crystal surfaces have connecting and non-connecting regions. The non-connecting regions are connected to the connecting regions on both sides. The depth difference H1 between the non-connecting and connecting regions is 15mm, and the depth gradually increases along the direction from the connecting region to the non-connecting region. The ratio of the length L3 of the non-connecting region to the width L1 of the first crystal surface on the first crystal surface is 3:5, and the ratio of the length L4 of the connecting region to the width L1 of the first crystal surface on the first crystal surface is 1:5. The ratio of the length L5 of the non-connecting region to the width L2 of the second crystal surface on the second crystal surface is 1:2, and the ratio of the length L6 of the connecting region to the width L2 of the second crystal surface on the second crystal surface is 1:4. The crystallizer in this embodiment is an aluminum crystallizer, and the depth of the crystallizer in the non-connecting region is 120mm.

[0028] Example 2 This embodiment is the second embodiment of the casting process for producing 1-series aluminum alloys. This embodiment is similar to Embodiment 1, except that as the casting length K gradually increases, the casting speed linearly increases from the initial casting speed of 35 mm / min to the steady-state casting speed of 50 mm / min, and the cooling water flow rate increases from the initial cooling water flow rate of 45.8 m³ / min. 3 The cooling water flow rate increases linearly to a steady-state flow rate of 86.2 m³ / h. 3 / h; the difference between the steady-state casting speed and the initial casting speed is 15mm / min, and the ratio of the initial cooling water flow rate to the steady-state cooling water flow rate is 0.53:1.

[0029] In this embodiment, the above method is used to produce 1-series aluminum alloy ingots with casting specifications of 1600mm×550mm. The casting start-up process parameters used in step (3) of this embodiment are shown in Table 2, where the ingot thickness is... Ingot width , The casting speed is 50 mm / min, with a steady-state casting speed of 50 mm / min. Cooling water flow control parameters, cooling water flow adjustment parameters The cooling water temperature was 25℃, and the appearance of the aluminum alloy ingot obtained after casting was as follows. Figure 5 As shown.

[0030] Table 2. Casting start-up process parameters for Example 2

[0031] Example 3 This embodiment is the third embodiment of the casting process for producing 1-series aluminum alloys. This embodiment is similar to Embodiment 1, except that as the casting length K gradually increases, the casting speed linearly increases from an initial casting speed of 40 mm / min to a steady-state casting speed of 60 mm / min, and the cooling water flow rate increases from an initial cooling water flow rate of 52.4 m³ / min. 3The cooling water flow rate increases linearly to a steady-state flow rate of 103.4 m³ / h. 3 / h; the difference between the steady-state casting speed and the initial casting speed is 20mm / min, and the ratio of the initial cooling water flow rate to the steady-state cooling water flow rate is 0.51:1.

[0032] In this embodiment, the above method is used to produce 1-series aluminum alloy ingots with casting specifications of 1600mm×550mm. The casting start-up process parameters used in step (3) of this embodiment are shown in Table 2, where the ingot thickness is... Ingot width , The casting speed is 60 mm / min, with a steady-state casting speed of 60 mm / min. Cooling water flow control parameters, cooling water flow adjustment parameters The cooling water temperature was 25℃, and the appearance of the aluminum alloy ingot obtained after casting was as follows. Figure 6 As shown.

[0033] Table 3. Casting start-up process parameters for Example 3

[0034] Comparative Example 1 This comparative example is the first comparative example of the casting process for 1-series aluminum alloy production. This example is similar to Example 1, except that the initial casting speed is 50 mm / min, the steady-state casting speed is 60 mm / min, and the cooling water flow rate is changed from the initial cooling water flow rate of 65.5 m³ / min. 3 The cooling water flow rate increases linearly to a steady-state flow rate of 103.4 m³ / h. 3 / h; the difference between the steady-state casting speed and the initial casting speed is 10mm / min, and the ratio of the initial cooling water flow rate to the steady-state cooling water flow rate is 0.63:1.

[0035] The casting starter process parameters used in step (3) of this comparative example are shown in Table 4. The appearance of the aluminum alloy ingot obtained after casting is as follows. Figure 7 As shown, cracks exist on the outer surface of the aluminum alloy ingot.

[0036] Table 4. Casting start-up process parameters for Comparative Example 1

[0037] Comparative Example 2 This comparative example is the second comparative example of the casting process for 1-series aluminum alloy production. This example is similar to Example 1, except that the initial casting speed is 30 mm / min, the steady-state casting speed is 60 mm / min, and the cooling water flow rate is changed from the initial cooling water flow rate of 39.3 m³ / min. 3 The cooling water flow rate increases linearly to a steady-state flow rate of 103.4 m³ / h. 3 / h; the difference between the steady-state casting speed and the initial casting speed is 30mm / min, and the ratio of the initial cooling water flow rate to the steady-state cooling water flow rate is 0.38:1. The casting starter process parameters used in step (3) of this comparative example are shown in Table 5. The appearance of the aluminum alloy ingot obtained after casting is as follows. Figure 8 As shown, there is a cold shut on the outer surface of the aluminum alloy ingot.

[0038] Table 5. Casting start-up process parameters for Comparative Example 2

[0039] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A casting process for producing 1-series aluminum alloys, characterized in that, Includes the following steps: Molten aluminum is poured into the crystallizer of the casting machine, and cooling water is introduced into the crystallizer; as the casting length K gradually increases, the casting speed... The cooling water flow rate increases linearly from the initial casting speed to the steady-state casting speed. The initial cooling water flow rate is linearly increased to the steady-state cooling water flow rate; the difference between the steady-state casting speed and the initial casting speed is 15~20 mm / min, and the ratio of the initial cooling water flow rate to the steady-state cooling water flow rate is (0.4~0.6):1; the steady-state casting speed is 50~60 mm / min; when the casting length K is less than or equal to 300 mm, the cooling water flow rate V... w Satisfy the following formula: Where D is the ingot thickness, L is the ingot width, and V is the casting speed. For cooling water flow control parameters, 1.4 × 10 -6 ≤ ≤2.1×10 -6 , Adjust the cooling water flow rate parameters to ensure that 0.9 ≤ ≤1.

1.

2. The casting process for producing 1-series aluminum alloys according to claim 1, characterized in that, When the casting length K is equal to 0 mm, the casting speed The cooling water flow rate control parameter is 35~40 mm / min. It is 1.49 10 -6 .

3. The casting process for producing 1-series aluminum alloys according to claim 1, characterized in that, When the casting length K is equal to 100mm, the casting speed The cooling water flow rate control parameter is 40~45 mm / min. It is 1.76 10 -6 .

4. The casting process for producing 1-series aluminum alloys according to claim 1, characterized in that, When the casting length K is equal to 200mm, the casting speed The cooling water flow rate control parameter is 45~50 mm / min. It is 1.89 10 -6 .

5. The casting process for producing 1-series aluminum alloys according to claim 1, characterized in that, When the casting length K is equal to 300mm, the casting speed The cooling water flow rate control parameter is 50~55 mm / min. It is 1.96 10 -6 .

6. The casting process for producing 1-series aluminum alloys according to any one of claims 1 to 5, characterized in that, When the casting length K is greater than 300mm, the casting speed K is the steady-state casting speed, and the cooling water flow rate is the steady-state cooling water flow rate.

7. The casting process for producing 1-series aluminum alloys according to any one of claims 1 to 5, characterized in that, The cooling water temperature is 15~35℃.

8. The casting process for producing 1-series aluminum alloys according to any one of claims 1 to 5, characterized in that, The crystallizer is rectangular in shape and includes a first crystallization surface and a second crystallization surface that are connected to each other. The width of the first crystallization surface is greater than that of the second crystallization surface. Cooling water channels are provided on both the first and second crystallization surfaces. The first crystallization surface includes a first cooling zone, a second cooling zone, and a third cooling zone. The first cooling zone is located at the center of the first crystallization surface. The two ends of the second cooling zone are connected to the first cooling zone and the third cooling zone, respectively. The second crystallization surface includes a fourth cooling zone and a fifth cooling zone. The fifth cooling zone is located at the center of the second crystallization surface and is connected to the fourth cooling zone, respectively. The cooling water flow rate of the first cooling zone is the same as that of the fifth cooling zone and is 1.3 to 1.7 times that of the third cooling zone. The cooling water flow rate of the second cooling zone is 1.8 to 2.2 times that of the third cooling zone. The cooling water flow rate of the fourth cooling zone is the same as that of the third cooling zone.

9. The casting process for producing 1-series aluminum alloys according to any one of claims 1 to 5, characterized in that, The crystallizer includes a first crystallization surface and a second crystallization surface that are connected to each other. Both the first crystallization surface and the second crystallization surface are provided with a connecting area and a non-connecting area. Both sides of the non-connecting area are connected to the connecting area. The depth difference between the non-connecting area and the connecting area is 10~20mm.

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