A method and apparatus for casting a high-uniformity large-size aluminum alloy ingot

Abstract

The application discloses a high-uniformity large-size aluminum alloy ingot casting method and device, and belongs to the technical field of aluminum alloy casting. The high-uniformity large-size aluminum alloy ingot casting method is characterized by the following steps: injecting aluminum alloy liquid which has been refined and degassed into a crystallizer; synchronously inserting a hole aluminum alloy sheet of the same material into the core of the aluminum alloy liquid in the crystallizer; after the aluminum alloy liquid solidifies to form a shell in the crystallizer, starting an ingot head, and synchronously inserting the aluminum alloy sheet into the liquid surface until the casting is completed. The application forms a mesh structure which can be continuously inserted by the hole aluminum alloy sheet in space, gradually inserts the liquid melting zone in the crystallizer, divides the solidification of the aluminum liquid in the casting process into a plurality of small units, and thus can greatly improve the solidification temperature field distribution of the aluminum alloy melt, and achieves the purpose of improving the uniformity of alloy composition and structure. The process is simple and convenient to operate, overcomes the limitation of large-width preparation of difficult-to-cast aluminum alloy ingots, and is suitable for industrial production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum alloy casting, in particular to a casting method and device for high-uniformity large-specification aluminum alloy ingot. BACKGROUND

[0002] Aluminum alloy ingot is an important raw material for preparing various types of aluminum materials, and is usually used to prepare various types of aluminum alloy profiles through pressure processing such as extrusion and rolling. In recent years, with the development of large-scale demand for downstream components, integration of pressure processing equipment, and continuous production, the industry has increasingly high requirements for the single weight and width of aluminum alloy ingot specifications.

[0003] At present, the industry usually adopts a semi-continuous casting method to process large-specification aluminum ingots. The specific principle is that through the cooling of a crystallizer and the continuous downward pulling of a hydraulic cylinder, large-specification round ingots or flat ingots are realized. However, when casting large-specification products, due to the difference in cooling speed between the core and the outer wall, it is inevitable that the solidification structure and composition of the ingot will be uneven, and the degree of unevenness often becomes more serious as the size of the cast ingot increases. This is because the solidification of the aluminum liquid starts from the inner wall of the crystallizer and expands vertically to the inside of the aluminum liquid, so the casting structure has obvious directionality. As the aluminum solidification layer thickens, the heat transfer coefficient decreases, and the inconsistency in the formation and growth of the inner and outer crystal nuclei leads to changes in the shape, orientation, and size of the grains, and the composition also changes. These ultimately significantly deteriorate the product performance, cause poor processing performance of the aluminum alloy, and ultimately lead to product scrap.

[0004] To improve the uniformity of the structure and composition of the aluminum alloy ingot, the industry usually adopts homogenization heat treatment for the prepared blank or adds grain refiners to the melt to improve the uniformity of the internal structure of the ingot. Or through electromagnetic, ultrasonic, and other ways to stir the melt during solidification to solve the problems of segregation and uneven temperature distribution during solidification. These measures and control methods can produce certain beneficial effects when dealing with the uniformity of small-specification ingots, but the effect of such measures is often limited when preparing large-width aluminum alloy slab ingots. To improve the uniformity of the ingot, the industry has also made many measures from the design of the crystallizer, such as increasing the number of shunt bags to allow the aluminum liquid to flow into the crystallizer from different directions to improve the flowability of the aluminum liquid and improve the uniformity of the solute and structure in the aluminum alloy ultra-wide flat ingot. There are also ways to install stirring devices in the crystallizer to improve the flowability of the uncrystallized solidified liquid. However, these measures still start from the flowability of the high-temperature liquid to improve uniformity, especially when preparing slab with a minimum distance from the center to the edge of more than 200 mm. Since the problem of inconsistent cooling speed between the core and the edge of the ingot cannot be fundamentally solved, the uniformity of the large-specification ingot structure still exists. Ultimately, it leads to deterioration of product performance and cannot meet the high-quality demand of deep processing parts. SUMMARY

[0005] The present application aims to provide a casting method and device for super large size aluminum alloy ingot, in the liquid melting area, insert the same material aluminum alloy sheet, the liquid cooling area is divided into several small units, effectively improve the temperature distribution uniformity of aluminum alloy melt in crystallizer, reduce the cooling temperature gradient of edge and core area, ultimately achieve the purpose of improving the alloy composition and uniformity.

[0006] One of the purposes of the present application is to provide a casting method for high uniformity large size aluminum alloy ingot, comprising the following steps:

[0007] Step 1: inject the aluminum alloy liquid which has been refined and degassed into the crystallizer;

[0008] Step 2: insert the same material aluminum alloy sheet with holes into the core of the aluminum alloy liquid in the crystallizer synchronously;

[0009] Step 3: after the aluminum alloy liquid solidifies to form a shell in the crystallizer, start the dummy bar head, and synchronously insert the aluminum alloy sheet into the liquid surface for casting. After the ingot reaches the required size, the aluminum alloy ingot is taken out.

[0010] Preferably, the aluminum alloy liquid in step 1 is injected into the crystallizer through a flow guide pipe or a metal liquid distribution disc.

[0011] Preferably, the thickness of the aluminum alloy sheet in step 2 is between 0.2-0.5mm, the width is 20-30mm, the center of the aluminum alloy sheet is a punched structure, the diameter of the hole is 60-80% of the width of the aluminum alloy sheet, and the head of the aluminum alloy sheet is a sharp needle.

[0012] Preferably, the aluminum alloy sheet is multiple, and forms a grid structure in space. The distance between the outermost edge of the aluminum alloy sheet and the inner wall of the crystallizer is 50-100mm, and the side length of the grid formed by the aluminum alloy sheet is between 200-400mm.

[0013] Preferably, the length of the aluminum alloy sheet inserted into the un-solidified aluminum alloy liquid in step 2 is controlled to be between 10-20mm, and the farther the distance from the center of the crystallizer, the shorter the depth of the liquid surface.

[0014] In step 3, the speed of the aluminum alloy sheet gradually inserted into the liquid surface is consistent with the speed of the dummy bar head.

[0015] The second purpose of the present application is to provide a casting device for the above-mentioned high uniformity large size aluminum alloy ingot casting method, which comprises a dummy bar device and a crystallizer above it, and further comprises:

[0016] A meshing disc is arranged above the crystallizer through a supporting assembly, and the aluminum alloy belts are wound on the meshing disc;

[0017] A meshing belt cooling disc is arranged directly above the crystallizer and below the meshing disc, and is used for cooling the aluminum alloy belts entering the aluminum alloy liquid; the bottom of the meshing belt cooling disc is provided with perforations corresponding to the aluminum alloy belts, and the lower ends of the aluminum alloy belts are placed in the aluminum alloy liquid after passing through the perforations;

[0018] A straightening device is arranged above the meshing belt cooling disc, and is used for keeping the aluminum alloy belts vertical.

[0019] Preferably, a meshing belt supporting frame is further arranged for supporting the aluminum alloy belts discharged from the meshing disc.

[0020] Preferably, the straightening device is two opposite straightening wheels, and the aluminum alloy belts are located between the two straightening wheels.

[0021] Compared with the prior art, the beneficial effects of the present application are as follows: the present application is composed of aluminum alloy sheets of the same material to form a mesh structure, so that the solidification field of the aluminum alloy liquid in the crystallizer is divided into multiple small areas, and the excessively high temperature field in the core can be conducted to the outside through the aluminum sheets, thereby fundamentally solving the problems of composition segregation and uneven structure caused by inconsistent cooling speed, and making the control of casting process parameters easy, especially suitable for 2 series and 7 series difficult-to-cast alloys. In principle, the casting size of the aluminum alloy ingot is not limited by this method, and the problems of easy cracking, large shrinkage cavity and inability to cast after the super-large specification of the ingot are solved.

[0022] In addition, the mesh structure composed of the aluminum alloy sheets used in the casting method can utilize the residual heat of the aluminum alloy liquid to dissolve in the liquid phase during the casting process. Since the products are of the same material, any impurities and defects will not be introduced while the liquid cooling field is changed. In addition, the installed device can be installed in the traditional semi-continuous casting device, which is simple in structure and convenient in operation, and is suitable for industrialization and popularization. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure diagram of the metal semi-continuous casting device provided by the present application is shown;

[0024] Figure 2 The shape diagram of the aluminum sheet inserted in the metal semi-continuous casting provided by the present application is shown;

[0025] Figure 3 The top view of the meshing belt cooling disc provided by the present application is shown.

[0026] BRIEF DESCRIPTION OF DRAWINGS:

[0027] 1, dummy device; 2, crystallizer; 3, mesh disc; 4, mesh belt support frame; 5, mesh belt cooling disc; 6, aluminum alloy belt; 7, straightening wheel group; 8, flow guide pipe. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings and examples, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments. Based on the examples in the present application, all other examples obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0029] A casting method of high-uniformity large-specification aluminum alloy ingot, comprising the following steps:

[0030] Step 1: injecting the refined and degassed aluminum alloy liquid into the crystallizer;

[0031] Step 2: synchronously inserting the aluminum alloy sheet with holes of the same material into the core of the aluminum alloy liquid in the crystallizer;

[0032] Step 3: after the aluminum alloy liquid is solidified to form a shell in the crystallizer, starting the dummy head, and synchronously inserting the aluminum alloy sheet into the liquid surface for casting, and taking out the aluminum alloy ingot after the ingot reaches the required size.

[0033] Preferably, the aluminum alloy liquid in step 1 is injected into the crystallizer through the flow guide pipe or the metal liquid distribution disc.

[0034] Preferably, the thickness of the aluminum alloy sheet in step 2 is between 0.2-0.5mm, the width is 20-30mm, the center of the aluminum alloy sheet is a punched structure, the diameter of the hole is 60-80% of the width of the aluminum alloy sheet, and the head of the aluminum alloy sheet is a sharp needle.

[0035] Preferably, the aluminum alloy sheet is multiple, and forms a grid structure in space, the distance between the most edge insertion position of the aluminum alloy sheet and the inner wall of the crystallizer is 50-100mm, and the side length of the grid formed by the aluminum alloy sheet is between 200-400mm.

[0036] Preferably, the length of the aluminum alloy sheet inserted into the un-solidified aluminum alloy liquid in step 2 is controlled to be between 10-20mm, and the farther away from the center of the crystallizer, the shorter the depth of the insertion liquid surface.

[0037] The speed of the aluminum alloy sheet gradually inserted into the liquid surface in step 3 is consistent with the speed of the dummy head.

[0038] The present application also discloses a casting device used in the above-mentioned casting method of high-uniformity large-specification aluminum alloy ingot, comprising a dummy device 1 and a crystallizer 2 located above it, further comprising:

[0039] A net releasing disc 3 is arranged above the crystallizer 2 through a supporting assembly, and the aluminum alloy belt 6 is wound on the net releasing disc 3;

[0040] A net belt cooling disc 5 is arranged directly above the crystallizer 2 and below the net releasing disc 3, and is used for cooling the aluminum alloy belt 6 entering the aluminum alloy liquid; a bottom of the net belt cooling disc 5 is provided with a through hole corresponding to each aluminum alloy belt 6, and the lower end of the aluminum alloy belt 6 is placed in the aluminum alloy liquid after passing through the through hole;

[0041] A straightening device 7 is arranged above the net belt cooling disc 5, and is used for keeping the aluminum alloy belt 6 vertical.

[0042] Preferably, a net belt supporting frame 4 is further arranged, and is used for supporting the aluminum alloy belt 6 released by the net releasing disc 3.

[0043] Preferably, the straightening device 7 is two opposite straightening wheels, and the aluminum alloy belt 6 is located between the two straightening wheels.

[0044] In the following examples, the experimental methods and detection methods are all conventional methods unless otherwise specified; and the reagents and materials can be purchased on the market unless otherwise specified.

[0045] The casting method of the large-specification high-uniformity aluminum alloy ingot provided by the embodiment of the application includes three steps, and the three steps can be realized through the device shown in the figure: Figure 1

[0046] Step 1: The aluminum alloy liquid refined and degassed is injected into the crystallizer through the flow guide pipe 8 or the metal liquid flow dividing disc. In this step, it is consistent with the traditional semi-continuous casting method. Figure 1 The aluminum liquid flow guide pipe in the figure is only a schematic, in order to increase the flowability or dispersibility of the liquid, a flow dividing disc device or multiple flow guide pipe inlets can be added at the end of the flow guide pipe, and it will not cause substantial influence on the whole casting method and casting effect.

[0047] Step 2: The aluminum alloy sheet with holes of the same material is synchronously inserted into the core of the aluminum alloy liquid in the crystallizer 2, and the aluminum alloy sheets form a grid structure in the space range.

[0048] In this step, the distance between the nearest insertion position of the aluminum alloy grid edge aluminum alloy sheet and the inner wall of the crystallizer is 50-100 mm, and the distance between the nearest insertion position of the aluminum alloy grid edge aluminum alloy sheet and the inner wall of the crystallizer is too close, which will cause the cooling speed of the edge to be too fast, and the balance cooling effect cannot be achieved. And the distance between the nearest insertion position of the aluminum alloy grid edge aluminum alloy sheet and the inner wall of the crystallizer is too far, which will cause the cooling speed of the edge to be too slow, and the distance between 50-100 mm can achieve the purpose of balancing the cooling speed of the edge and the core.

[0049] ​In this step, the thickness of the aluminum alloy sheet is between 0.2-0.5mm, the width is 20-30mm, the center of the aluminum alloy sheet is a punched structure, and the head of the sheet is a sharp needle. By controlling the thickness and width of the aluminum alloy sheet, the purpose is to ensure that the aluminum sheet has a certain rigidity, and at the same time can realize synchronous dissolution in the high-temperature liquid during insertion. If the aluminum sheet is too thin or too narrow, the rigidity of the inserted aluminum sheet will not be enough, and after being inserted into the aluminum liquid, it cannot form a network structure. It affects the uniformization effect of the temperature field. While the aluminum alloy sheet is too thick or too wide, it is difficult to achieve complete dissolution in the aluminum liquid online, and the existing solid particles in the solidification process will deteriorate the performance of the structure. At the same time, the center of the sheet is punched, which can well increase the flowability of the aluminum alloy liquid and prevent the network structure from hindering the flow process of the liquid. The head is made into a sharp needle shape to facilitate the rapid dissolution of the aluminum alloy sheet and the flow of the aluminum alloy liquid during the initial solidification.

[0050] In this step, the aluminum alloy space network structure is realized by various devices installed above the crystallizer 2. The existing netting disc 3 can wind multiple aluminum alloy sheets 6 at a time, realizing unified control of the netting speed. The straightening wheel 7 arranged on the net belt cooling disc 5 is to make the aluminum sheet have a certain straightness, and the network structure formed is more regular; and the opening structure of the net belt cooling disc 5 is to control the size of the grid and provide cooling capacity, balance the cooling speed of the core and the edge.

[0051] Step 3: When the aluminum alloy liquid is solidified to form a shell in the crystallizer 2, the dummy head is started, and the aluminum alloy sheet 6 is inserted into the liquid surface at the same time, and the casting is carried out. After the ingot reaches the required size, the aluminum alloy ingot is taken out. In this step, the arrangement of the aluminum alloy sheet 6 in the space is grid-shaped, and the grid inserted into the aluminum liquid can be dissolved in the aluminum liquid, absorbing part of the heat. At the same time, the netting disc 3 can provide multiple aluminum alloy sheets 6 at a time, realizing the continuous supply of the grid during melting. In this way, the grid provided can divide the cast aluminum liquid into several small cooling units, and the heat of the core of the cast ingot is taken away by the inserted aluminum sheet to achieve the purpose of uniformization. On the other hand, the grid provided dissolves rapidly under the residual heat of the liquid, absorbs a certain amount of heat, and speeds up the cooling. Since the area of the aluminum sheet inserted into the aluminum liquid is large, the heat absorption is large, and thus the core cooling speed is improved, finally playing a role in adjusting the temperature field of the alloy ingot. In this way, the continuous casting production of super-large specification ingots can be realized, and the problem of large difference between the cooling speed of the edge and the core of the large specification ingot is completely solved. After reaching the required casting size, the casting is finally terminated.

[0052] The application will be further described below through specific examples.

[0053] Example 1

[0054] A 2000 mm wide x 400 mm thick x 3000 mm long 7050 series aluminum alloy slab was prepared according to the following steps:

[0055] Step 1, the 7050 series aluminum alloy liquid after refining, degassing through the two flow guide pipe 8 shown in Figure 1 flows into the crystallizer 2. Figure 1

[0056] Step 2: using the meshing disc 3 shown in Figure 3, the width of 20 mm, thickness of 0.5 mm 7050 rolled aluminum sheet through the straightening wheel 7 shown in Figure 4, and then through the meshing cooling disc 5 shown in Figure 5. On the meshing cooling disc 5, a spatial grid structure is formed with a small unit of 200 mm, as shown in Figure 6. The aluminum strip passing through the meshing cooling disc is inserted into the crystallizer, with the aluminum sheet head being a sharp structure, the punching diameter being 14 mm, and the meshing cooling disc 5 controlling the distance between the outermost part and the inner wall of the crystallizer 2 to be 50 mm. Figure 1 Figure 1 Figure 1 Step 3: after the aluminum alloy liquid solidifies to form a shell in the crystallizer 2, the dummy bar head is started, and the aluminum alloy sheet 6 is inserted into the liquid surface at the same time, with the distance between the center of the ingot and the liquid being 15 mm, and the distance between the surrounding and the liquid decreasing in turn, with the shortest distance being 5 mm. Then adjust the meshing speed and the drawing speed to be consistent, and cast the ingot, and take out the aluminum alloy ingot after the ingot reaches the required size. Figure 3

[0057] After casting, the aluminum alloy ingot is cut along the core, and through crystal phase detection, the average grain size of the outermost part is 70 um, and the average grain size of the core is 85 um, and there is no crack in the ingot.

[0058] Example 2

[0059] A 3000 mm wide x 600 mm thick x 4000 mm long 7075 aluminum alloy slab was prepared according to the following steps:

[0060] Step 1, the 7075 aluminum alloy liquid after refining, degassing through the two flow guide pipe 8 shown in Figure 1 flows into the crystallizer 2.

[0061] Step 2: using the meshing disc 3 shown in Figure 3, the width of 30 mm, thickness of 0.2 mm 7075 rolled aluminum sheet through the straightening wheel 7 shown in Figure 4, and then through the meshing cooling disc 5 shown in Figure 5. On the meshing cooling disc 5, a spatial grid structure is formed with a small unit of 400 mm, as shown in Figure 6. The aluminum strip passing through the meshing cooling disc is inserted into the crystallizer, with the aluminum sheet head being a sharp structure, the punching diameter being 14 mm, and the meshing cooling disc 5 controlling the distance between the outermost part and the inner wall of the crystallizer 2 to be 50 mm. Figure 1

[0062] Step 3: after the aluminum alloy liquid solidifies to form a shell in the crystallizer 2, the dummy bar head is started, and the aluminum alloy sheet 6 is inserted into the liquid surface at the same time, with the distance between the center of the ingot and the liquid being 15 mm, and the distance between the surrounding and the liquid decreasing in turn, with the shortest distance being 5 mm. Then adjust the meshing speed and the drawing speed to be consistent, and cast the ingot, and take out the aluminum alloy ingot after the ingot reaches the required size. Figure 1 Figure 1 Figure 1 After casting, the aluminum alloy ingot is cut along the core, and through crystal phase detection, the average grain size of the outermost part is 70 um, and the average grain size of the core is 85 um, and there is no crack in the ingot. Figure 3 ​​​​​​​The aluminum strip inserted through the mesh cooling disc 5 into the crystallizer 2 has a pointed head, and the punch diameter is 21 mm. The mesh cooling disc 5 controls the distance between the outermost part of the inserted aluminum strip and the inner wall of the crystallizer 2 to be 100 mm.

[0063] Step 3: After the aluminum alloy liquid solidifies into a shell in the crystallizer 2, the dummy head is started, and the aluminum alloy strip 6 is inserted into the liquid surface at the same time. The distance of the strip inserted into the liquid through the center of the ingot is 20 mm, and the distance around the center decreases gradually, and the shortest distance is 10 mm. Then, the meshing speed is adjusted to be consistent with the pulling speed, and the casting is performed. After the ingot reaches the required size, the aluminum alloy ingot is taken out.

[0064] After the casting is completed, the aluminum alloy ingot is cut along the core, and the average grain size of the outermost part is 100 um, and the average grain size of the core is 120 um. The ingot has uniform structure and no cracks inside.

[0065] Example 3

[0066] A 5083 aluminum alloy flat ingot with a width of 2000 mm x a thickness of 400 mm x a length of 3000 mm is prepared according to the following steps:

[0067] Step 1: The 5083 aluminum alloy liquid after refining and degassing is introduced into the crystallizer through the flow guide pipe and the liquid equalizing bag.

[0068] Step 2: The 25 mm wide and 0.3 mm thick 5083 rolled aluminum strip is inserted into the mesh cooling disc 5 through the straightening wheel 7 shown in FIG. 3, and then through the mesh cooling disc 5 shown in FIG. 4. On the mesh cooling disc 5, a spatial grid structure is formed with 300 mm as a small unit, as shown in FIG. 5. The aluminum strip inserted through the mesh cooling disc 5 into the crystallizer 2 has a pointed head, and the punch diameter is 20 mm. The cooling disc controls the distance between the outermost part of the inserted aluminum strip and the inner wall of the crystallizer to be 50 mm. Figure 1 Figure 1 Step 3: After the aluminum alloy liquid solidifies into a shell in the crystallizer 2, the dummy head is started, and the aluminum alloy strip 6 is inserted into the liquid surface at the same time. The distance of the strip inserted into the liquid through the center of the ingot is 20 mm, and the distance around the center decreases gradually, and the shortest distance is 10 mm. Then, the meshing speed is adjusted to be consistent with the pulling speed, and the casting is performed. After the ingot reaches the required size, the aluminum alloy ingot is taken out. Figure 1 Figure 3 After the casting is completed, the aluminum alloy ingot is cut along the core, and the average grain size of the outermost part is 100 um, and the average grain size of the core is 120 um. The ingot has uniform structure and no cracks inside.

[0069] Step 3: After the aluminum alloy liquid solidifies into a shell in the crystallizer 2, the dummy head is started, and the aluminum alloy strip 6 is inserted into the liquid surface at the same time. The distance of the strip inserted into the liquid through the center of the ingot is 20 mm, and the distance around the center decreases gradually, and the shortest distance is 10 mm. Then, the meshing speed is adjusted to be consistent with the pulling speed, and the casting is performed. After the ingot reaches the required size, the aluminum alloy ingot is taken out.

[0070] After the casting is completed, the aluminum alloy ingot is cut along the core, and the average grain size of the outermost part is 100 um, and the average grain size of the core is 120 um. The ingot has uniform structure and no cracks inside. ​​

[0071] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

[0072] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the expenditure will be limited only by the claims and equivalents thereof.

Claims

1. A casting method of a high-uniformity large-size aluminum alloy ingot, characterized by, It comprises the following steps: Step 1: injecting refined and degassed aluminum alloy liquid into a crystallizer; Step 2: synchronously inserting aluminum alloy sheets with holes into the core of the aluminum alloy liquid in the crystallizer, the thickness of the aluminum alloy sheets in step 2 is between 0.2-0.5 mm, the width is 20-30 mm, the center of the aluminum alloy sheet is a punched structure, the diameter of the hole is 60-80% of the width of the aluminum alloy sheet, and the head of the aluminum alloy sheet is a sharp needle; the aluminum alloy sheets are multiple and form a grid structure in space, the distance between the most edge of the aluminum alloy sheet and the inner wall of the crystallizer is 50-100 mm, the side length of the grid formed by the aluminum alloy sheets is between 200-400 mm, the length of the aluminum alloy sheet inserted into the un-solidified aluminum alloy liquid is controlled between 10-20 mm, and the farther the distance from the center of the crystallizer, the shorter the depth of the liquid surface; Step 3: after the aluminum alloy liquid is solidified to form a shell in the crystallizer, the dummy head is started, and the aluminum alloy sheet is synchronously inserted into the liquid surface for casting, and the aluminum alloy ingot is taken out after the ingot reaches the required size.

2. The casting method of a high-uniformity large-size aluminum alloy ingot according to claim 1, characterized by, The aluminum alloy liquid in step 1 is injected into the crystallizer through a flow guide pipe or a metal liquid distribution disc.

3. The casting method of a high-uniformity large-size aluminum alloy ingot according to claim 1, characterized by, The speed of the aluminum alloy sheet inserted into the liquid surface in step 3 is consistent with the speed of the dummy head.

4. The casting apparatus of the high-uniformity large-size aluminum alloy ingot casting method according to any one of claims 1 to 3, comprising an ingot guide device (1) and a crystallizer (2) located above the ingot guide device (1); characterized in that, It also includes: A net releasing disc (3) is arranged above the crystallizer (2) through a support assembly, and an aluminum alloy belt (6) is wound on the net releasing disc (3); A net belt cooling disc (5) is arranged directly above the crystallizer (2) and below the net releasing disc (3), and is used for cooling the aluminum alloy belt (6) entering the aluminum alloy liquid; the bottom of the net belt cooling disc (5) is provided with a through hole corresponding to each aluminum alloy belt (6), and the lower end of the aluminum alloy belt (6) is placed in the aluminum alloy liquid after passing through the through hole; A straightening device (7) is arranged above the net belt cooling disc (5) and is used for keeping the aluminum alloy belt (6) vertical.

5. The high-uniformity large-specification aluminum alloy ingot casting device of claim 4, further comprising a net belt support frame (4) for supporting the aluminum alloy belt (6) released by the net releasing disc (3).

6. The high-uniformity large-specification aluminum alloy ingot casting device of claim 4, wherein the straightening device (7) is two opposite straightening wheels, and the aluminum alloy belt (6) is located between the two straightening wheels.

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