KR20210073781A - Method for manufacturing high strength aluminum alloy forged plate - Google Patents

Abstract

The present invention relates to a manufacturing method of a high-strength aluminum alloy forged plate comprising: a step of adding 5.06-5.16 wt% of zinc (Zn), 1.32-1.42 wt% of copper (Cu), 2.25-2.35 wt% of magnesium (Mg), and 0.14-0.24 wt% of chromium (Cr) based on a high-strength aluminum alloy composition, and performing a melting process on aluminum alloy materials including other inevitable impurities; a step of performing a degassing process on a molten aluminum alloy acquired through the melting process; a step of performing a casting process after the degassing process; a step of performing a homogenization process on a slab acquired through the casting process; a step of performing a hot forging process by reheating the slab after the homogenization process; a step of cutting and surface-cutting a forged plate acquired through the hot forging process; and a step of performing a final heat treatment process on the cut and surface-cut forged plate. Manufacturing costs can be reduced by destroying the cast structure and securing size, and a high-strength aluminum alloy forged plate for manufacturing a spoke of a multi-piece wheel can be provided.

Description

Manufacturing method of high strength aluminum alloy forged plate {METHOD FOR MANUFACTURING HIGH STRENGTH ALUMINUM ALLOY FORGED PLATE}

The present invention is a melting process, casting process, homogenization process, hot forging process and final heat treatment process to manufacture a high-strength aluminum alloy forged plate, it is possible to reduce the manufacturing cost through the destruction of the cast structure and securing the dimensions, multi-piece It relates to a method of manufacturing a high-strength aluminum alloy forged plate capable of providing a high-strength aluminum alloy forged plate for manufacturing the spokes of a multi-piece wheel.

As is well known, the domestic premium wheel and aftermarket wheel markets are monopolized by overseas advanced makers, and efforts to improve mechanical properties are mainly made by adding alloy refiners such as Sc and Ti-B to the aluminum alloy A7075 material. Domestic companies also need to secure competitiveness with foreign manufacturers through technological differentiation in ways such as diversification of construction methods for weight reduction and application of lightweight materials.

On the other hand, the weight reduction of the lower part of the spring itself plays a role of lightening the upper weight of the spring relatively, and there is a difference of approximately 1kg in the wheel with the difference in weight when the car is running and 15~20kg, obtained from 4 wheels. The weight reduction effect is known to reach at least 160~180kg, so weight reduction at the wheel is emerging as an efficient method as a realistic way to reduce vehicle fuel efficiency.

Recently, in order to reduce the weight of multi-piece wheels, a method for manufacturing high-strength aluminum alloy rolled plates such as A7075 is being developed by cutting, and the plates used here are imported from US and Russian companies.

On the other hand, domestic aluminum sheet manufacturers are producing or developing technologies by dividing them into DC casting (direct chill casting) and strip casting (strip casting), and are mainly focused on general materials, food and beverages, construction materials, and electrical and electronic materials. Mainly mass production of low-strength or medium-strength grade materials (e.g., 1xxx, 3xxx, 5xxx, 6xxx series aluminum alloys), and most high-strength aluminum alloy plates (e.g., 2xxx, 7xxx series aluminum alloys) are all imported is known to depend on

In addition, in Korea, there is no jumbo slab, rolling facility, or manufacturing experience of high-strength aluminum alloys (eg, 2xxx, 7xxx series aluminum alloys). There is a problem in that it is difficult to introduce rolling equipment for high-strength alloys.

Accordingly, in the case of high-strength aluminum alloy sheet, which relies on imports, there are difficulties in supply and demand due to high unit price, supply instability, and long delivery time. As it became possible to manufacture high strength and jumbo sizes, development of various alloy manufacturing technologies and prevention of cracks during casting for high strength and jumbo slabs and jumbo billets is being actively conducted.

As described above, through the transfer of high strength and jumbo material casting technology, high strength aluminum alloy jumbo slab and jumbo billet have risen to the ranks of localization, but subsequent processes (e.g., large/wide rolling, large forging, etc.) ), there is no infrastructure in Korea, so it is difficult to create added value.

Meanwhile, in Korea, using various methods (mainly strip casting, twin-roll casting, etc.), attempts are being made to develop manufacturing technology for small-scale (eg, narrow, sheet, etc.) high-strength aluminum alloy plates.

1. Korea Patent Publication No. 10-2006-0021965 (published on March 9, 2006) 2. Korean Patent No. 10-1258801 (Registered on May 2, 2013)

The present invention is a melting process, casting process, homogenization process, hot forging process and final heat treatment process to manufacture a high-strength aluminum alloy forged plate, it is possible to reduce the manufacturing cost through the destruction of the cast structure and securing the dimensions, multi-piece An object of the present invention is to provide a method for manufacturing a high-strength aluminum alloy forged plate capable of providing a high-strength aluminum alloy forged plate for manufacturing spokes of a wheel.

In addition, the present invention adds zinc (Zn), copper (Cu), magnesium (Mg) and chromium (Cr) based on the high-strength aluminum alloy composition, and a dissolution process for aluminum alloy raw materials containing other unavoidable impurities, degassing By sequentially performing the treatment process, casting process, homogenization process, hot forging process, and final heat treatment process, high-strength aluminum with improved durability and mechanical properties by reducing hydrogen gas content, suppressing cracks, suppressing macrosegregation, and realizing a uniform microstructure An object of the present invention is to provide a method for manufacturing a high-strength aluminum alloy forged plate capable of providing an alloy plate.

The purpose of the embodiments of the present invention is not limited to the above-mentioned purpose, and other objects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. .

According to an embodiment of the present invention, based on the high strength aluminum alloy composition, zinc (Zn) 5.06-5.16 wt%, copper (Cu) 1.32-1.42 wt%, magnesium (Mg) 2.25-2.35 wt%, and chromium (Cr) 0.14- Adding 0.24 wt%, performing a melting process on an aluminum alloy raw material including other unavoidable impurities, performing a degassing process on the aluminum alloy molten metal obtained through the melting process, and the degassing process performing a casting process after the gas treatment process, performing a homogenization process on the slab obtained through the casting process, and reheating the slab after the homogenization process to perform a hot forging process; A method of manufacturing a high-strength aluminum alloy forged plate comprising the steps of cutting and chamfering the forged plate obtained through the hot forging process, and performing a final heat treatment process for the cut and chamfered forged plate can be provided. .

In addition, according to an embodiment of the present invention, the melting process is performed in the range of 700-750° C. using a reflection furnace, and a method for manufacturing a high-strength aluminum alloy forged plate is provided by sufficiently stirring the molten metal through an electromagnetic stirring device. can be

In addition, according to an embodiment of the present invention, in the degassing process, the aluminum alloy molten metal is moved to a gas bubbling filtration (GBF) chamber, and then a mixed gas is introduced into the molten metal at 700-750° C. A method of manufacturing a high-strength aluminum alloy forged plate may be provided.

In addition, according to an embodiment of the present invention, the casting process is performed by continuously casting at a temperature of 680-720° C. using an automatic control DC casting machine, and continuously supplying an aluminum (Al) particle refiner during casting. A method for manufacturing a high-strength aluminum alloy forged plate may be provided.

In addition, according to an embodiment of the present invention, in the homogenization treatment process, the temperature is raised to a target temperature of 466-477°C at a temperature increase rate of 30-50°C/Hr for uniform temperature distribution in the thickness and width directions of the slab. There may be provided a method of manufacturing a high strength aluminum alloy forged plate carried out in a manner that is maintained for 30-40 hours.

In addition, according to an embodiment of the present invention, the homogenization treatment process may be provided with a method of manufacturing a high-strength aluminum alloy forged plate that is performed in a manner of performing a furnace cooling after performing the maintaining step.

In addition, according to an embodiment of the present invention, the hot forging process is performed by reheating to 420-450° C. for at least 10 hours and hot forging using a mechanical press or a hydraulic press. may be provided.

In addition, according to an embodiment of the present invention, the final heat treatment process is performed in a manner of solution heat treatment within the range of 460-499° C. for 2-7 hours, and aging treatment at 110-130° C. for 23-25 hours. A method for manufacturing a high strength aluminum alloy forged plate may be provided.

In addition, according to an embodiment of the present invention, the final heat treatment process is a solution heat treatment in the range of 2-7 hours within the range of 460-499°C, and 6.5-7.5 at 102-113°C by applying an aging treatment of a multi-stage cycle. There may be provided a method of manufacturing a high-strength aluminum alloy forged plate that is carried out in a manner of maintaining time, continuously raising the temperature to 157-168° C.

In addition, according to an embodiment of the present invention, the high-strength aluminum alloy, a method of manufacturing a high-strength aluminum alloy forged plate including a 2xxx-based aluminum alloy or a 7xxx-based aluminum alloy may be provided.

The present invention is a melting process, casting process, homogenization process, hot forging process and final heat treatment process to manufacture a high-strength aluminum alloy forged plate, it is possible to reduce the manufacturing cost through the destruction of the cast structure and securing the dimensions, multi-piece A high-strength aluminum alloy forged plate can be provided for making spokes of wheels.

In addition, the present invention adds zinc (Zn), copper (Cu), magnesium (Mg) and chromium (Cr) based on the high-strength aluminum alloy composition, and a dissolution process for aluminum alloy raw materials containing other unavoidable impurities, degassing By sequentially performing the treatment process, casting process, homogenization process, hot forging process, and final heat treatment process, high-strength aluminum with improved durability and mechanical properties by reducing hydrogen gas content, suppressing cracks, suppressing macrosegregation, and realizing a uniform microstructure An alloy plate may be provided.

In addition, the present invention can manufacture a high-strength aluminum alloy plate through a hot forging process using a commercial high-strength aluminum alloy, so that a forged plate having excellent dimensions and strength can be manufactured without performing an expensive rolling process as in the prior art. , it is possible to provide a high-strength aluminum alloy sheet that can be used as a material for manufacturing automobile parts, especially multi-piece wheels, by performing a final heat treatment process or through additional machining.

1 is a flowchart showing the process of manufacturing a high-strength aluminum alloy forged plate according to an embodiment of the present invention,
2 to 12 are views for explaining the manufacturing process of the high-strength aluminum alloy forged plate according to an embodiment of the present invention.

Advantages and features of embodiments of the present invention, and methods of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

In describing the embodiments of the present invention, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating a process for manufacturing a high-strength aluminum alloy forged plate according to an embodiment of the present invention, and FIGS. 2 to 12 are for explaining the manufacturing process of a high-strength aluminum alloy forged plate according to an embodiment of the present invention It is a drawing.

1 , based on the high strength aluminum alloy composition, zinc (Zn) 5.06-5.16 wt%, copper (Cu) 1.32-1.42 wt%, magnesium (Mg) 2.25-2.35 wt%, and chromium (Cr) 0.14-0.24 wt% %, and may perform a dissolution process for the aluminum alloy raw material including other unavoidable impurities (step 110).

Here, the high strength aluminum alloy may include a 2xxx-based aluminum alloy or a 7xxx-based aluminum alloy, and A7075, which is a 7xxx-based aluminum alloy, may have a composition as shown in FIG. 2 .

In addition, the melting process is performed in the range of 700-750° C. using a reflection furnace, and the molten aluminum alloy can be tapped by sufficiently stirring the molten metal through an electromagnetic stirrer.

Here, in the process of performing the dissolution process, at a temperature exceeding 750° C., the oxidation rate of aluminum increases exponentially, and in particular, it can promote the formation of spinel such as _{MgAl 2} O _{4 , and such spinel is generally a metal line} It exists in the form of a very hard colony around it, and at temperatures below 700°C, the high melting point elements (for example, Cu, Cr, etc.) do not dissolve sufficiently, so that when they enter the material, the mechanical properties can be weakened, so 700-750°C The dissolution process should be carried out within the scope.

In the aluminum alloy raw material as described above, zinc (Zn) can be added to improve corrosion resistance while reducing the susceptibility to stress corrosion cracking or intergranular corrosion of the structure of the aluminum alloy forging material, and copper (Cu) is used to increase the strength by solid solution strengthening. It can be added to promote age hardening of aluminum alloy forgings in high temperature aging treatment while improving, and magnesium (Mg) can be added to give high strength and proof strength by precipitating in crystal grains by high temperature aging treatment, chromium (Cr) suppresses recrystallization as the intermetallic compound (dispersed particles) generated during the temperature rise and maintenance of the homogenization heat treatment is finely, densely and uniformly dispersed, and may be added to refine the crystal grains by inhibiting recrystallization and preventing grain coarsening after recrystallization. have.

In addition, a degassing process may be performed on the molten aluminum alloy obtained through the dissolution process of step 110 (step 120).

Here, the degassing process is a process of removing hydrogen gas from the molten aluminum alloy dissolved in the melting process to control the hydrogen gas concentration in 100 g of the aluminum alloy to 0.1 ml or less, and the molten aluminum alloy is transferred to a gas bubbling filtration (GBF) chamber After moving to the furnace, it can be carried out by bubbling the mixed gas in the molten metal in the range of 700-750°C, and through this, an effective refining process for non-metallic inclusions, alkali metals and dissolved hydrogen gas can be performed.

For example, Figure 3 shows the hydrogen gas content measurement results in 3000mmL casting and 4000mmL casting, and it can be seen that 0.084ml/100g and 0.082ml/100g hydrogen gas content is measured in each casting process. Accordingly, it can be seen that the dissolved hydrogen gas content was properly controlled.

This hydrogen gas is easily mixed as impurities when dissolving the aluminum alloy, and since the bubbles caused by hydrogen are not compressed by forging and significantly reduce the toughness and fatigue properties, it should be appropriately controlled to a maximum of 0.1ml/100g or less. .

Next, a casting process may be performed after the degassing process of step 120 (step 130).

Here, the casting process is a process of casting the degassed aluminum alloy molten metal, continuously casting at a temperature of 680-720°C using an automatic control DC casting machine, and continuously supplying an aluminum (Al) particle refiner during casting can be done in this way.

In the continuous casting process as described above, the temperature of 680-720 ° C is for castability and structure control, and at a temperature exceeding 720 ° C, the crystal grains can be coarsened by lowering the cooling rate of the cast slab, and the temperature of less than 680 ° C. Continuous casting should be carried out within the range of 680-720℃ because the temperature can weaken the castability of the material and cause defects.

In this casting process, FIG. 4 shows a schematic diagram of a structure installed for the purpose of intermittent cooling in order to prevent cracks occurring according to the temperature gradient of the surface and the center during casting of the high-strength jumbo slab. And, as the temperature of the solidified portion rises again, it is possible to suppress the occurrence of cracks in the slab due to the thermal gradient.

And, Figure 5 shows the temperature gradient analysis results for the slab surface and the center at the end of casting according to the cooling method. In the case of continuous cooling, both were cooled to 100° C. or less in the lower part, and in the case of intermittent cooling, relatively high in the lower part of the structure. It can be confirmed that the temperature is maintained.

In addition, a homogenization treatment process for the slab obtained through the casting process of step 130 may be performed (step 140).

Here, the homogenization treatment process is a process of performing a homogenization heat treatment on the ingot cast through the casting process, and the target temperature is 466 at a temperature increase rate of 30-50°C/Hr for uniform temperature distribution in the thickness and width directions of the slab. It can be carried out in a manner that the temperature is raised to -477 ℃ and maintained for 30-40 hours.

This homogenization treatment process may be performed in a manner of performing the furnace cooling after performing the maintaining step.

In the case of the jumbo slab in the homogenization treatment process as described above, after the temperature of the surface and the center is balanced, a relatively low temperature increase rate is applied to reach the soaking section to prevent overheating of the surface portion. .

In addition, when the final holding temperature is 466°C or higher, diffusion of solid-solute elements is easy, and if it is maintained at a temperature close to the solidus line exceeding 477°C, it may lead to product defects such as surface melting, so the temperature of 466-477°C A final maintenance in the range should be performed.

In addition, the furnace cooling should be performed to suppress the generation of residual stress in the jumbo slab after the homogenization treatment due to rapid cooling.

For example, the homogenization treatment process may be performed under the process conditions shown in FIG. 6 , and may be performed within a minimum temperature of 466°C and a maximum temperature of 477°C for 30-40 hours. Here, the maximum temperature rise temperature can be set to 30-50 ℃ / Hr, it can be carried out by slow cooling in the furnace.

Through the homogenization treatment process as described above, it is possible to manufacture a slab having a uniform composition in the width direction and thickness direction of the product by effective diffusion treatment of solid solution atoms segregated at the grain boundaries of the jumbo slab.

When explaining the results of the homogenization treatment process, FIG. 7 shows the measurement results of the chemical composition macrosegregation from the surface to the center based on the width direction (long axis) of the slab after the homogenization treatment process. Zinc (Zn), the main added element , copper (Cu), magnesium (Mg), chromium (Cr), and titanium (Ti) were located within the upper/lower limits in all regions, and it can be confirmed that the homogenization treatment was well performed without macrosegregation in the width direction.

In addition, FIG. 8 shows the microstructure measurement results from the surface to the center based on the width direction (long axis) of the slab after the homogenization process. In all regions, the solid solution atoms are well diffused into the aluminum (Al) matrix without segregation at the grain boundaries. The results are shown, and it can be seen that a similar grain size distribution appears except for the surface portion where the cooling rate is relatively fast.

Then, after the homogenization process of step 140, the slab may be reheated to perform a hot forging process (step 150).

Here, the hot forging process uses a homogenized heat-treated ingot as a forging material and cools it to the hot forging start temperature or to a lower temperature (room temperature) than the hot forging start temperature, then hot forging the reheated forging material by a mechanical press or hydraulic press. As a process, the cooled forging material is reheated to 420-450° C. for at least 10 hours, and hot forging using a mechanical press, hydraulic press, etc. may be performed, and free forging at a forging ratio of 6:1 to cast microstructure It is possible to manufacture a forging plate that destroys the tissue and satisfies the dimensions, but the forging ratio is not limited thereto, and may be changed according to the thickness of the initially input material and the thickness of the final product.

In the hot forging process as described above, in order to reduce flow stress and improve plastic workability, forging in the range of 420-450 ° C is required, and when forging is performed at a temperature lower than 420 ° C or exceeding 450 ° C, the fluidity of the metal is reduced and internal defects due to a decrease in strength.

Next, the forging plate obtained through the hot forging process of step 150 may be cut and chamfered (step 160). For example, it can be cut and chamfered with a forged plate of 500 * 500 * 120 t (80-150 t). Of course, it can be cut and chamfered in various ranges depending on the size and forging ratio of the initial input raw material.

Subsequently, a final heat treatment process may be performed on the forged plate cut and chamfered in step 160 (step 170).

Here, the final heat treatment process is a process of performing solution heat treatment and aging treatment so as to have the strength, corrosion resistance and toughness of the aluminum alloy forging material as necessary after the forging process, and solution heat treatment in the range of 2-7 hours within the range of 460-499 ° C. Treatment is carried out in a manner of aging at 110-130°C for 23-25 hours, or solution heat treatment within the range of 460-499°C for 2-7 hours, and aging treatment in multiple cycles according to strength requirements. It can be applied and maintained at 102-113 ° C. for 6.5-7.5 hours, and continuously heated to 157-168 ° C. and maintained for 26-28 hours to perform over-aging treatment.

In the solution heat treatment process as described above, at 460° C. for less than 2 hours, it is difficult to form a supersaturated solid solution sufficiently, so it is difficult to realize the required physical properties after aging treatment. At 499° C. and a temperature exceeding 7 hours, as in the homogenization process, the surface of the product And melting may occur at the grain interface to deteriorate mechanical properties.

In addition, in the aging treatment process, fine precipitates cannot be precipitated in a sufficient amount at 110° C. for less than 23 hours, and when it exceeds 130° C. for 25 hours, over-aging treatment may reduce mechanical properties due to the development of coarse precipitates. It should be carried out in the temperature range of 110~130℃.

On the other hand, depending on the application, overaging treatment may be selected to lower the mechanical strength and improve other properties (stress corrosion cracking resistance, or electrical conductivity). Strength is improved by maintaining the first stage, and in the second stage maintaining section, it is over-aged beyond the peak point at a relatively high temperature of 157 ~ 168 ° C. It should be carried out so that the mechanical properties can be lowered and other properties can be improved. .

For example, as shown in FIG. 9, the solution heat treatment can be performed for 2-7 hours within a minimum temperature of 460°C and a maximum temperature of 499°C, and the aging heat treatment is performed at a minimum temperature of 110°C and 130°C. It can be carried out for 23-25 hours at maximum temperature.

When explaining the results of the hot forging process and the final heat treatment process as described above, FIG. 10 shows the middle layer microstructure of the forging plate thickness after hot free forging and final heat treatment, unlike the casting microstructure in FIG. It was confirmed that the microstructure development deformed by the forging process was developed, and the cast structure was all destroyed, and fine precipitates were developed in the Al matrix after aging treatment.

In addition, FIG. 11 is a table showing the mechanical properties of the A7075 alloy for each manufacturing process, and in the case of the forging material, it did not show a large difference in strength after the homogenization treatment, but it was found that the strength was greatly improved after the final heat treatment. Here, although the elongation is partially decreased, it can be determined that the elongation is lowered due to the improvement in strength.

A multi-piece wheel spoke may be manufactured as shown in FIG. 12 by cutting the high-strength aluminum alloy forged plate manufactured through the process as described above.

Therefore, the present invention can reduce the manufacturing cost through the destruction of the cast structure and securing the dimensions by manufacturing the high-strength aluminum alloy forged plate by performing the melting process, the casting process, the homogenization process, the hot forging process, and the final heat treatment process, A high-strength aluminum alloy forged plate for making spokes of multi-piece wheels can be provided.

In addition, the present invention adds zinc (Zn), copper (Cu), magnesium (Mg) and chromium (Cr) based on the high-strength aluminum alloy composition, and a dissolution process for aluminum alloy raw materials containing other unavoidable impurities, degassing By sequentially performing the treatment process, casting process, homogenization process, hot forging process, and final heat treatment process, high-strength aluminum with improved durability and mechanical properties by reducing hydrogen gas content, suppressing cracks, suppressing macrosegregation, and realizing a uniform microstructure An alloy plate may be provided.

In addition, the present invention can manufacture a high-strength aluminum alloy plate through a hot forging process using a commercial high-strength aluminum alloy, so that a forged plate having excellent dimensions and strength can be manufactured without performing an expensive rolling process as in the prior art. , it is possible to provide a high-strength aluminum alloy sheet that can be used as a material for manufacturing automobile parts, especially multi-piece wheels, by performing a final heat treatment process or through additional machining.

In the above description, various embodiments of the present invention have been presented and described, but the present invention is not necessarily limited thereto. It will be readily appreciated that branch substitutions, transformations and alterations are possible.

Claims (10)

Based on the high strength aluminum alloy composition, zinc (Zn) 5.06-5.16 wt%, copper (Cu) 1.32-1.42 wt%, magnesium (Mg) 2.25-2.35 wt%, and chromium (Cr) 0.14-0.24 wt% are added, and others performing a dissolution process for an aluminum alloy raw material containing unavoidable impurities;
performing a degassing process on the aluminum alloy molten metal obtained through the melting process;
performing a casting process after the degassing process;
performing a homogenization treatment process on the slab obtained through the casting process;
performing a hot forging process by reheating the slab after the homogenization process;
cutting and chamfering the forged plate obtained through the hot forging process;
performing a final heat treatment process on the cut and faceted forged plate
A method of manufacturing a high-strength aluminum alloy forged plate comprising a. The method of claim 1,
The melting process is carried out in the range of 700-750° C. using a reflection furnace, and the method for manufacturing a high-strength aluminum alloy forged plate in which the molten metal is sufficiently stirred through an electromagnetic stirrer. 3. The method of claim 2,
The degassing process is performed by moving the aluminum alloy molten metal to a gas bubbling filtration (GBF) chamber and then bubbling the mixed gas in the molten metal at 700-750° C. Way. 4. The method of claim 3,
The casting process is a method of manufacturing a high-strength aluminum alloy forged plate that is continuously cast at a temperature of 680-720° C. using an automatic control DC casting machine, and is continuously supplied with an aluminum (Al) particle refiner during casting. 5. The method of claim 4,
The homogenization treatment process is performed in a way that the temperature is raised to a target temperature of 466-477°C at a temperature increase rate of 30-50°C/Hr for uniform temperature distribution in the thickness and width directions of the slab and maintained for 30-40 hours. A method of manufacturing a high-strength aluminum alloy forged plate. 6. The method of claim 5,
The homogenization process is a method of manufacturing a high-strength aluminum alloy forged plate that is performed in a manner that performs furnace cooling after performing the holding step. 7. The method of claim 6,
The hot forging process is a method of manufacturing a high-strength aluminum alloy forging plate that is performed by reheating at 420-450° C. for at least 10 hours and performing hot forging using a mechanical press or a hydraulic press. 8. The method of claim 7,
The final heat treatment process, solution heat treatment in the range of 2-7 hours within the range of 460-499 ℃, the method of manufacturing a high-strength aluminum alloy forged plate is performed in a manner of aging at 110-130 ℃ 23-25 hours. 8. The method of claim 7,
The final heat treatment process is solution heat treatment within the range of 2-7 hours within the range of 460-499 ℃, applying multi-cycle aging treatment, maintaining at 102-113 ℃ for 6.5-7.5 hours, and continuously 157-168 ℃ A method of manufacturing a high-strength aluminum alloy forged plate, which is carried out in a manner of over-aging by raising the temperature to a furnace and maintaining it for 26-28 hours. 10. The method according to any one of claims 1 to 9,
The high strength aluminum alloy is a method of manufacturing a high strength aluminum alloy forged plate comprising a 2xxx series aluminum alloy or a 7xxx series aluminum alloy.

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