Manufacturing method of arc-shaped beam aluminum alloy die forging

Abstract

The invention discloses a manufacturing method of an arc-shaped beam aluminum alloy die forging, and belongs to the technical field of metal materials. The method aims at solving the problems that in the existing arc-shaped beam die forging manufacturing process, die pressing is not formed, folding defects exist, and the mechanical property does not reach the standard. The method comprises: casting an aluminum alloy ingot; performing extrusion; heating the blank and locally drawing out; bending is conducted; die forging forming; and carrying out two-time die forging forming. According to the arc-shaped beam aluminum alloy die forging manufactured through the method, the size meets the standard requirement, the manufactured die forging is easy to form, the material utilization rate is high, the defect of folding is not likely to occur, the service life of the die forging is prolonged, the performance requirement of an aircraft frame is met, and the characteristic of stress deformation in the machining process and the using process of a user is improved. The method is suitable for manufacturing the arc-shaped beam aluminum alloy die forgings.

Description

Technical Field

[0001] The invention belongs to the technical field of metal materials, and in particular relates to a method for manufacturing an arc-shaped beam aluminum alloy die forging. Background Art

[0002] With the rapid development of the aviation industry, the performance requirements for aluminum alloy structural parts are getting higher and higher. Structural parts are developing towards high performance, precision and complexity. Some load-bearing structural parts in transport aircraft need to be designed as arc shapes due to the use conditions. They not only require good performance, but also need to be free of surface defects and not deformed during use, which puts forward higher use requirements for such special-shaped structural parts.

[0003] If the existing arc-shaped die forgings of this type are not up to standard in terms of blank size, the die forgings will become unformed and scrap after die pressing; the semicircular stress is large after quenching, which often leads to the inability to be processed after deformation. There are many reinforcing ribs on the arc, and there are folding defects after die pressing. If the repair is not thorough, it is very easy to break along the fold during use, causing a safety hazard to the aircraft. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of non-forming by die pressing, folding defects and substandard mechanical properties in the preparation of existing arc-shaped beam die forgings, and to provide a method for manufacturing arc-shaped beam aluminum alloy die forgings.

[0005] The manufacturing method of the curved beam aluminum alloy die forging is specifically carried out in the following steps:

[0006] 1. Casting aluminum alloy ingot: The size of the aluminum alloy ingot is a cylindrical ingot of Φ482mm×1000mm; the mass percentage of elements in the aluminum alloy ingot is: Si is 0.7% to 1.2%, Fe is ≤0.7%, Cu is 1.8% to 2.6%, Mn is 0.4% to 0.8%, Mg is 0.4% to 0.8%, Ni is ≤0.1%, Zn is ≤0.30%, Ti is ≤0.15%, Fe+Ni is ≤0.7%, a single impurity is ≤0.05%, a total impurity is ≤0.15%, and the balance is Al;

[0007] 2. The aluminum alloy ingot described in step 1 is charged into a furnace and heated to 320° C. to 350° C., and then extruded into rods. After the extruded rods are head-cut, tail-cut and cut into low multiples, rods with a length of 1250 mm are cut into blanks;

[0008] 3. Heating and partially drawing the blank: heating the blank obtained in step 2 to 420°C-450°C, and then locally drawing it on a 3000-ton vertical free forging hydraulic press, with the first piece forging temperature at 430°C-440°C, the first piece final forging temperature at 400°C-430°C, the last piece forging temperature at 430°C-450°C, the last piece final forging temperature at 400°C-430°C, and the die temperature at 360°C-380°C to obtain a drawn forging blank;

[0009] Fourth, the drawn forging blank obtained in the step is heated to 420-450°C, the start forging temperature is 430°C, and then bent on a 5000-ton vertical forging hydraulic press, the die temperature is controlled to be 350°C-400°C, and the blank is bent according to the bending process to the same curved blank as the sample;

[0010] 5. The bent blank obtained in step 4 is etched, washed and repaired, and then subjected to a die forging process, the heating temperature of the bent blank is 420°C to 450°C, the first piece forging temperature is 420°C to 440°C, the first piece final forging temperature is 400°C to 430°C, the last piece forging temperature is 410°C to 430°C, the last piece final forging temperature is 400°C to 420°C, and the die temperature is 360°C to 380°C to obtain a die forging;

[0011] 6. The die forging obtained in step 5 is etched and repaired, then die forged twice, and then etched and repaired, pre-fire inspection, quenching treatment and aging treatment are carried out in sequence to complete the manufacture of the curved beam aluminum alloy die forging.

[0012] The present invention solves the problems of molded unformed and folded waste products, and solves the problem of stress deformation by optimizing the process, so that the mechanical properties meet the standards and stable supply can be achieved.

[0013] The arc-shaped beam aluminum alloy die forging manufactured by the present invention not only meets the standard requirements in terms of size, but also improves the overall performance of the semicircular forging, improves the stress and deformation characteristics of the user during the machining process and the use process, reduces the defect of unqualified low-magnification structure, improves the bearing capacity of the die forging, and increases the service life of the arc-shaped beam aluminum alloy die forging, thus meeting the requirements of the arc-shaped beam aluminum alloy die forging.

[0014] The manufacturing method of the arc-shaped beam aluminum alloy die forging in the present invention is characterized by improving the bearing capacity of the special-shaped die forging, and the die forging is easy to form, has a high material utilization rate, is not prone to folding defects, increases the service life of the die forging, and meets the performance requirements of aviation structural parts. The present invention realizes the stable production of special-shaped structural parts, can reduce the manufacturing cost of transport aircraft, and the technology has a wide range of promotion and application value in the aviation field. It can be used in the actual production of special-shaped die forgings to improve the bearing capacity and service life of the die forgings; it also has good economic benefits.

[0015] The invention is used for manufacturing arc-shaped beam aluminum alloy die forgings. DETAILED DESCRIPTION

[0016] Specific implementation method 1: The manufacturing method of the curved beam aluminum alloy die forging in this implementation method is specifically carried out according to the following steps:

[0017] 1. Casting aluminum alloy ingot: The size of the aluminum alloy ingot is a cylindrical ingot of Φ482mm×1000mm; the mass percentage of elements in the aluminum alloy ingot is: Si is 0.7% to 1.2%, Fe is ≤0.7%, Cu is 1.8% to 2.6%, Mn is 0.4% to 0.8%, Mg is 0.4% to 0.8%, Ni is ≤0.1%, Zn is ≤0.30%, Ti is ≤0.15%, Fe+Ni is ≤0.7%, a single impurity is ≤0.05%, a total impurity is ≤0.15%, and the balance is Al;

[0018] 2. The aluminum alloy ingot described in step 1 is charged into a furnace and heated to 320° C. to 350° C., and then extruded into rods. After the extruded rods are head-cut, tail-cut and cut into low multiples, rods with a length of 1250 mm are cut into blanks;

[0019] 3. Heating and partially drawing the blank: heating the blank obtained in step 2 to 420°C-450°C, and then locally drawing it on a 3000-ton vertical free forging hydraulic press, with the first piece forging temperature at 430°C-440°C, the first piece final forging temperature at 400°C-430°C, the last piece forging temperature at 430°C-450°C, the last piece final forging temperature at 400°C-430°C, and the die temperature at 360°C-380°C to obtain a drawn forging blank;

[0020] Fourth, the drawn forging blank obtained in the step is heated to 420-450°C, the start forging temperature is 430°C, and then bent on a 5000-ton vertical forging hydraulic press, the die temperature is controlled to be 350°C-400°C, and the blank is bent according to the bending process to the same curved blank as the sample;

[0021] 5. The bent blank obtained in step 4 is etched, washed and repaired, and then subjected to a die forging process, the heating temperature of the bent blank is 420°C to 450°C, the first piece forging temperature is 420°C to 440°C, the first piece final forging temperature is 400°C to 430°C, the last piece forging temperature is 410°C to 430°C, the last piece final forging temperature is 400°C to 420°C, and the die temperature is 360°C to 380°C to obtain a die forging;

[0022] 6. The die forging obtained in step 5 is etched and repaired, then die forged twice, and then etched and repaired, pre-fire inspection, quenching treatment and aging treatment are carried out in sequence to complete the manufacture of the curved beam aluminum alloy die forging.

[0023] In step 1 of this embodiment, the aluminum alloy ingot is cast using a conventional method.

[0024] The bending arc in step 4 must reach the specified size to facilitate the forming and performance of the forging.

[0025] Specific embodiment 2: This embodiment is different from specific embodiment 1 in that: in step 1, the mass percentage of elements in the aluminum alloy ingot is: Si is 0.90%, Fe is 0.5%, Cu is 2.2%, Mn is 0.60%, Mg is 0.7%, Ni is 0.06%, Zn is 0.10%, Ti is 0.05%, Fe+Ni is 0.56%, single impurity is ≤0.05%, total impurity is ≤0.15%, and the balance is Al. Others are the same as specific embodiment 1.

[0026] Specific implementation method 3: This implementation method is different from specific implementation method 1 or 2 in that: in step 2, the dust, aluminum chips and burrs on the surface of the aluminum alloy ingot are cleaned before loading into the furnace; when loading into the furnace, the aluminum alloy ingot is placed neatly and stably on the material tray. Others are the same as specific implementation method 1 or 2.

[0027] Specific embodiment 4: This embodiment is different from specific embodiments 1 to 3 in that: the extrusion in step 2: a 5000-ton horizontal hydraulic press with a 500mm diameter extrusion barrel is used to extrude a rod with a diameter of 180mm, the extrusion barrel temperature is 320℃~380℃, the extrusion speed is ≤0.6mm / s, the reverse extrusion method is used for extrusion, and the extrusion residue is required to be less than 25mm. The rest is the same as specific embodiments 1 to 3.

[0028] In this embodiment, the extrusion speed is ≤0.6 mm / s, the purpose of which is to control the formation of the coarse grain ring.

[0029] Specific embodiment 5: This embodiment is different from the specific embodiments 1 to 4 in that the etching and repairing process described in step 5 and step 6 is as follows: the parts to be washed are placed sideways in a stainless steel etching and washing basket, and are etched and degreased in an alkaline bath with a temperature of 50°C to 70°C and a mass concentration of 15% to 20% NaOH for 10 to 20 minutes, and then the alkaline solution is washed in a cold water tank at room temperature, and then placed in a room temperature mass concentration of 30 to 40% HNO 3 The forgings are neutralized and washed in an acid tank for 5 to 8 minutes, then put into a cold water tank at room temperature to clean the acid solution, and then rinsed in a hot water tank at a temperature of 50 to 70°C. After being taken out, they are placed on a repair site with an aluminum pad on the ground for repair, and defects in the forgings are checked and removed. The rest is the same as the first to fourth embodiments.

[0030] The sideways placement described in this embodiment is intended to prevent the etching liquid from flowing into and out of the inner cavity of the forging, resulting in incomplete etching.

[0031] The defects of the forgings described in this embodiment refer to defects such as folding and bumping.

[0032] Specific implementation method 6: This implementation method is different from specific implementation methods 1 to 5 in that: the two die forgings described in step 6: before die forging, use compressed air to remove the dirt in the die cavity, install the upper die and the lower die and lubricate them with sand ingot oil, when the die forgings come out of the furnace, the start forging temperature and the final forging temperature of the first and last piece of each horizontal material tray are 400℃~450℃, and the die pressing is carried out by a 5000-ton vertical forging hydraulic press. The die forgings are pressed twice, and lubrication is pressed twice during the final pressing, and then the car is lifted and deflated before pressing again, and then the first piece is inspected, the mark is printed to the specified position, and then the burrs are cut, and the residual amount of burrs after cutting is ≤8mm, and bite is not allowed. The rest is the same as specific implementation methods 1 to 5.

[0033] In this embodiment, the mark is printed at a specified position, and the handwriting is required to be neat and clear.

[0034] Specific embodiment 7: This embodiment is different from specific embodiments 1 to 6 in that: the two lubrications use a mixture of sand ingot oil and graphite as lubricating oil; the mass ratio of the sand ingot oil to graphite is 10:(1-1.5). Others are the same as specific embodiments 1 to 6.

[0035] Specific implementation eight: This implementation is different from specific implementations one to seven in that: the quenching treatment described in step six: the die forgings and test samples that have completed the pre-fire inspection are placed flat in the quenching basket, quenched at a temperature of 510℃~516℃, the insulation time is 150~180min according to air insulation, and the temperature of the water used for quenching is 60℃~80℃; the quenching transfer time is ≤15s, and the quenching basket is reciprocated and lifted in the water for more than 5 times, and then it stays in the water for 15min before being lifted out of the water, and the quenching furnace number is set to the specified position. Others are the same as specific implementations one to seven.

[0036] In this embodiment, the die forging is placed flat in the square quenching basket, so as to facilitate the flow of water in the inner cavity of the die forging.

[0037] In this embodiment, the writing of the quenching furnace number is required to be neat and clear.

[0038] Specific embodiment 9: This embodiment is different from specific embodiments 1 to 8 in that: the sample is randomly selected from the die forgings of the same batch that have completed the pre-fire inspection, and cut and sampled to obtain the sample. The rest is the same as specific embodiments 1 to 8.

[0039] Specific embodiment 10: This embodiment differs from specific embodiments 1 to 9 in that: the aging treatment in step 6 is carried out at a temperature of 153°C to 160°C, the heat preservation time is 8 hours for the metal, and the total heating time is 8 hours to 14 hours. Others are the same as specific embodiments 1 to 9.

[0040] When the materials are loaded into the aging furnace for aging treatment in this embodiment, the material racks must be placed in a way that is conducive to the smooth circulation of air so that the heating is uniform and rapid.

[0041] The content of the present invention is not limited to the content of the above-mentioned embodiments. The combination of one or several specific embodiments can also achieve the purpose of the invention.

[0042] Example:

[0043] The manufacturing method of the curved beam aluminum alloy die forging of this embodiment is specifically carried out according to the following steps:

[0044] 1. Casting aluminum alloy ingot: The size of the aluminum alloy ingot is a cylindrical ingot of Φ482mm×1000mm; the mass percentage of elements in the aluminum alloy ingot is: Si is 0.7% to 1.2%, Fe is ≤0.7%, Cu is 1.8% to 2.6%, Mn is 0.4% to 0.8%, Mg is 0.4% to 0.8%, Ni is ≤0.1%, Zn is ≤0.30%, Ti is ≤0.15%, Fe+Ni is ≤0.7%, a single impurity is ≤0.05%, a total impurity is ≤0.15%, and the balance is Al;

[0045] 2. The aluminum alloy ingot described in step 1 is charged into a furnace and heated to 320° C. to 350° C., and then extruded into rods. After the extruded rods are head-cut, tail-cut and cut into low multiples, rods with a length of 1250 mm are cut into blanks;

[0046] 3. Heating and partially drawing the blank: heating the blank obtained in step 2 to 420°C-450°C, and then locally drawing it on a 3000-ton vertical free forging hydraulic press, with the first piece forging temperature at 430°C-440°C, the first piece final forging temperature at 400°C-430°C, the last piece forging temperature at 430°C-450°C, the last piece final forging temperature at 400°C-430°C, and the die temperature at 360°C-380°C to obtain a drawn forging blank;

[0047] Fourth, the drawn forging blank obtained in the step is heated to 420-450°C, the start forging temperature is 430°C, and then bent on a 5000-ton vertical forging hydraulic press, the die temperature is controlled to be 350°C-400°C, and the blank is bent according to the bending process to the same curved blank as the sample;

[0048] 5. The bent blank obtained in step 4 is etched, washed and repaired, and then subjected to a die forging process, the heating temperature of the bent blank is 420°C to 450°C, the first piece forging temperature is 420°C to 440°C, the first piece final forging temperature is 400°C to 430°C, the last piece forging temperature is 410°C to 430°C, the last piece final forging temperature is 400°C to 420°C, and the die temperature is 360°C to 380°C to obtain a die forging;

[0049] 6. The die forging obtained in step 5 is etched and repaired, then die forged twice, and then etched and repaired, pre-fire inspection, quenching treatment and aging treatment are carried out in sequence to complete the manufacture of the curved beam aluminum alloy die forging.

[0050] The mass percentage of elements in the aluminum alloy ingot in step 1 is: Si is 0.90%, Fe is 0.5%, Cu is 2.2%, Mn is 0.60%, Mg is 0.7%, Ni is 0.06%, Zn is 0.10%, Ti is 0.05%, Fe+Ni is 0.56%, single impurity is ≤0.05%, total impurity is ≤0.15%, and the balance is Al.

[0051] In step 2, the dust, aluminum chips and burrs on the surface of the aluminum alloy ingots shall be cleaned before loading into the furnace; when loading into the furnace, the aluminum alloy ingots shall be placed neatly and stably on the material tray.

[0052] The extrusion in step 2: a 5000-ton horizontal hydraulic press with a Ф500mm extrusion barrel is used to extrude a rod with a diameter of Φ180mm, the extrusion barrel temperature is 320°C to 380°C, the extrusion speed is ≤0.6mm / s, and the extrusion is performed by a reverse extrusion method, and the extrusion residue is required to be less than 25mm.

[0053] The etching and repairing process described in step 5 and step 6 is as follows: the parts to be cleaned are placed sideways in a stainless steel etching and cleaning basket, and are etched and degreased in an alkaline bath with a mass concentration of 15% to 20% NaOH at a temperature of 50°C to 70°C for 10 to 20 minutes, and then the alkaline solution is washed in a cold water tank at room temperature, and then placed in a mass concentration of 30% to 40% HNO 3 Neutralize and wash in the acid tank for 5 to 8 minutes, then put it into the cold water tank at room temperature to wash off the acid, and then rinse it in the hot water tank at a temperature of 50 to 70°C. After taking it out, place it on the repair site with aluminum pads on the ground for repair, and check and remove defects in the forgings.

[0054] The two die forgings described in step six: before die forging, use compressed air to remove the dirt in the die cavity of the die, install the upper die and the lower die and lubricate them with sand ingot oil, when the die forgings are out of the furnace, the start forging temperature and the final forging temperature of the first and last piece of each horizontal row of material tray are 400℃~450℃, and the die pressing is carried out using a 5000-ton vertical forging hydraulic press. The die forgings are die pressed twice, and lubrication and pressing are carried out twice during the final pressing, then the car is lifted and deflated and then pressed again, and then the first piece is inspected, the mark is printed to the specified position, and then the burrs are cut, and the residual amount of burrs after cutting is ≤8mm.

[0055] The two-stage lubrication: a mixture of sand ingot oil and graphite is used as lubricating oil; the mass ratio of the sand ingot oil to the graphite is 10: (1-1.5).

[0056] The quenching treatment described in step six: the die forgings and test samples that have completed the pre-fire inspection are placed flat in the quenching basket, quenched at a temperature of 510°C to 516°C, the holding time is 150 to 180 minutes based on air insulation, and the temperature of the water used for quenching is 60°C to 80°C; the quenching transfer time is ≤15s, and the quenching basket is reciprocated and raised in the water for more than 5 times, then hung out of the water after staying in the water for 15 minutes, and the quenching furnace number is set to the specified position.

[0057] The test sample is obtained by randomly selecting one piece from the die forgings of the same batch that have completed the pre-fire inspection, cutting and sampling, and obtaining the test sample.

[0058] The aging treatment in step six is ​​carried out at a temperature of 153°C to 160°C, the heat preservation time is 8 hours for the metal, and the total heating time is 8 hours to 14 hours.

[0059] The curved beam aluminum alloy die forgings manufactured in this embodiment were sampled and analyzed with the same melting times, the same alloy grade, and the same forging conditions, and the performance was tested. The test results are as follows:

[0060] Brinell hardness: sample height 24.2mm, indentation diameter 3.71mm, hardness value 134.

[0061] Metallographic test: in accordance with GB / T 3246.2-2012 inspection standard.

[0062] Tensile test: GB / T 228.1-2010 is used as the inspection standard, which stipulates non-proportional elongation force of 7806.03N, non-proportional stress of 393.3Mpa, maximum force of 9107.26N, tensile strength of 458.86MPa, absolute elongation after fracture of 2.69%, and relative elongation after fracture of 10.76%.

Claims

1. A method for manufacturing an arc-shaped beam aluminum alloy die forging, characterized in that The method is specifically carried out in the following steps:

1. Casting aluminum alloy ingot: The size of the aluminum alloy ingot is a cylindrical ingot of Φ482mm×1000mm; the mass percentage of elements in the aluminum alloy ingot is: Si is 0.7% to 1.2%, Fe is ≤0.7%, Cu is 1.8% to 2.6%, Mn is 0.4% to 0.8%, Mg is 0.4% to 0.8%, Ni is ≤0.1%, Zn is ≤0.30%, Ti is ≤0.15%, Fe+Ni is ≤0.7%, a single impurity is ≤0.05%, a total impurity is ≤0.15%, and the balance is Al; 2. The aluminum alloy ingot described in step 1 is charged into a furnace and heated to 320° C. to 350° C., and then extruded into rods. After the extruded rods are head-cut, tail-cut and cut into low multiples, rods with a length of 1250 mm are cut into blanks; 3. Heating and partially drawing the blank: heating the blank obtained in step 2 to 420°C-450°C, and then locally drawing it on a 3000-ton vertical free forging hydraulic press, with the first piece forging temperature at 430°C-440°C, the first piece final forging temperature at 400°C-430°C, the last piece forging temperature at 430°C-450°C, the last piece final forging temperature at 400°C-430°C, and the die temperature at 360°C-380°C to obtain a drawn forging blank; Fourth, the drawn forging blank obtained in the step is heated to 420-450°C, the start forging temperature is 430°C, and then bent on a 5000-ton vertical forging hydraulic press, the die temperature is controlled to be 350°C-400°C, and the blank is bent according to the bending process to the same curved blank as the sample; 5. The bent blank obtained in step 4 is etched, washed and repaired, and then subjected to a die forging process, the heating temperature of the bent blank is 420°C to 450°C, the first piece forging temperature is 420°C to 440°C, the first piece final forging temperature is 400°C to 430°C, the last piece forging temperature is 410°C to 430°C, the last piece final forging temperature is 400°C to 420°C, and the die temperature is 360°C to 380°C to obtain a die forging; 6. The die forging obtained in step 5 is etched and repaired, then die forged twice, and then etched and repaired, pre-fire inspection, quenching treatment and aging treatment are carried out in sequence to complete the manufacture of the curved beam aluminum alloy die forging.

2. The method for manufacturing the curved beam aluminum alloy die forging according to claim 1, characterized in that The mass percentage of elements in the aluminum alloy ingot in step 1 is: Si is 0.90%, Fe is 0.5%, Cu is 2.2%, Mn is 0.60%, Mg is 0.7%, Ni is 0.06%, Zn is 0.10%, Ti is 0.05%, Fe+Ni is 0.56%, single impurity is ≤0.05%, total impurity is ≤0.15%, and the balance is Al.

3. The method for manufacturing the curved beam aluminum alloy die forging according to claim 1, characterized in that In step 2, the dust, aluminum chips and burrs on the surface of the aluminum alloy ingots shall be cleaned before loading into the furnace; when loading into the furnace, the aluminum alloy ingots shall be placed neatly and stably on the material tray.

4. The method for manufacturing the curved beam aluminum alloy die forging according to claim 1, characterized in that The extrusion in step 2: a 5000-ton horizontal hydraulic press with a Ф500mm extrusion barrel is used to extrude a rod with a diameter of Φ180mm, the extrusion barrel temperature is 320°C to 380°C, the extrusion speed is ≤0.6mm / s, and the extrusion is performed by a reverse extrusion method, and the extrusion residue is required to be less than 25mm.

5. The method for manufacturing the curved beam aluminum alloy die forging according to claim 1, characterized in that The etching and repairing processes described in step five and step six are: the parts to be washed are placed sideways in a stainless steel etching and washing special basket, and are etched and degreased in an alkaline bath liquid with a mass concentration of 15% to 20% NaOH at a temperature of 50°C to 70°C for 10 to 20 minutes, and then the alkaline solution is washed off in a cold water tank at room temperature, and then placed in an acid tank with a mass concentration of 30 to 40% HNO3 at room temperature for neutralization and washing for 5 to 8 minutes, and then placed in a cold water tank at room temperature for washing off the acid, and then rinsed in a hot water tank at a temperature of 50 to 70°C, and after being taken out, placed on a repair site with an aluminum pad on the ground for repair, and defects in the forgings are checked and removed.

6. The method for manufacturing the curved beam aluminum alloy die forging according to claim 1, characterized in that The two die forgings described in step six: before die forging, use compressed air to remove the dirt in the die cavity of the die, install the upper die and the lower die and lubricate them with sand ingot oil, when the die forgings are out of the furnace, the start forging temperature and the final forging temperature of the first and last piece of each horizontal row of material tray are 400℃~450℃, and the die pressing is carried out using a 5000-ton vertical forging hydraulic press. The die forgings are die pressed twice, and lubrication and pressing are carried out twice during the final pressing, then the car is lifted and deflated and then pressed again, and then the first piece is inspected, the mark is printed to the specified position, and then the burrs are cut, and the residual amount of burrs after cutting is ≤8mm.

7. The method for manufacturing the curved beam aluminum alloy die forging according to claim 6, characterized in that The two-stage lubrication: a mixture of sand ingot oil and graphite is used as lubricating oil; the mass ratio of the sand ingot oil to the graphite is 10: (1-1.5).

8. The method for manufacturing a curved beam aluminum alloy die forging according to claim 1, characterized in that The quenching treatment described in step six: the die forgings and test samples that have completed the pre-fire inspection are placed flat in the quenching basket, quenched at a temperature of 510°C to 516°C, the holding time is 150 to 180 minutes based on air insulation, and the temperature of the water used for quenching is 60°C to 80°C; the quenching transfer time is ≤15s, and the quenching basket is reciprocated and raised in the water for more than 5 times, then hung out of the water after staying in the water for 15 minutes, and the quenching furnace number is set to the specified position.

9. The method for manufacturing the curved beam aluminum alloy die forging according to claim 8, characterized in that The test sample is obtained by randomly selecting one piece from the die forgings of the same batch that have completed the pre-fire inspection, cutting and sampling, and obtaining the test sample.

10. The method for manufacturing a curved beam aluminum alloy die forging according to claim 1, characterized in that The aging treatment in step six is ​​carried out at a temperature of 153°C to 160°C, the heat preservation time is 8 hours for the metal, and the total heating time is 8 hours to 14 hours.