A manufacturing method for improving the comprehensive performance of aluminum alloy forgings

Abstract

The present invention relates to the technical field of forging technology, and in particular, to a manufacturing method for improving the comprehensive performance of aluminum alloy forgings. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings comprises the following steps: (a) placing a heat-treated bar in a concave die for upsetting; (b) placing the upset bar in a forming die for upsetting; (c) performing solution heat treatment, cold deformation and aging on the forging obtained by the upsetting. The manufacturing method can improve the comprehensive performance of aluminum alloy forgings.

Description

Technical Field

[0001] The invention relates to the technical field of forging technology, and in particular to a manufacturing method for improving the comprehensive performance of aluminum alloy forgings. Background Art

[0002] 2A70 aluminum alloy belongs to Al-Cu-Mg-Fe-Ni series heat-treatable aluminum alloy, the main alloying elements are Cu, Mg, Fe, Ni. Due to the presence of Cu and Mg elements, the chemical composition of the alloy is properly controlled, and the strengthening phases θ (CuAl2) and S (Al2CuMg) can be obtained at room temperature. These two strengthening phases have a good strengthening effect below 200℃ and can be used to manufacture parts working below 150℃~225℃. 2A70 aluminum alloy has good thermoplasticity and pressure processing properties, and has low density, good heat resistance, high specific strength, easy processing and molding, beautiful color, etc., making it widely used in aerospace engines, ships and marine engineering, automobiles and other fields, such as compressor impellers, blower impellers, etc. Many countries have made the research and development of aluminum and its alloys as the basic technology for key development and the key technology of national defense science and technology. With the development of the times, new and higher performance index requirements have been put forward for aluminum alloy forgings in order to expand the application of aluminum alloy forgings in aviation, aerospace, automobile and other fields. The new performance indicators have raised the requirements for the mechanical properties of 2A70 aluminum alloy forgings, and increased the requirements of low-magnification grain size ≤2 levels and high-magnification grain size ≥4 levels, which makes it extremely difficult to meet the comprehensive performance requirements of 2A70 aluminum alloy forgings.

[0003] At present, the forming method of round pancake-shaped 2A70 aluminum alloy forgings is: bar heating → upsetting → heat treatment → physical and chemical → rough processing. The main deformation direction of round pancake-shaped forgings is radial and axial (such as Figure 1 The forming process is direct downward pressing, that is, an irreversible forming process in which the outer diameter becomes larger and the height becomes shorter. The whole process is carried out continuously, which makes the forging prone to temperature rise, and the edge area has large deformation, the middle area has small deformation, and the deformation is uneven, resulting in coarse grains in some parts of the forging, making the low-multiple grain size, high-multiple grain size and mechanical properties of the forging fail to meet the design requirements, resulting in the product being unable to be delivered for use or even scrapped.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the problem that round pancake-shaped aluminum alloy forgings produce coarse grains due to the continuous forging process causing the forging temperature to rise, thereby solving the problem of unqualified forging performance, the present invention provides a manufacturing method for improving the comprehensive performance of aluminum alloy forgings to solve the problems existing in the above-mentioned prior art.

[0006] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0007] One aspect of the present invention relates to a manufacturing method for improving the comprehensive performance of an aluminum alloy forging, comprising the following steps:

[0008] (a) The heated bar is placed in a concave die for upsetting;

[0009] (b) placing the bar material after the upsetting in a forming die for upsetting;

[0010] (c) subjecting the forging obtained by the upsetting to solution heat treatment, cold deformation and aging.

[0011] The manufacturing method for improving the comprehensive performance of aluminum alloy forgings, by adopting the production mode of "concave die, forming die upsetting + pause", realizes good control of the deformation amount of round pancake forgings in the upsetting process; the pause allows the blank to have a certain heat dissipation time in the upsetting process, preventing the continuous upsetting forging from causing the internal temperature of the blank to rise and produce coarse grains, and finally making the forging product performance qualified. The forging process is carried out uniformly, and the amount of pressure deformation during each forging upsetting is uniform, so as to improve the uniformity of the forging structure, thereby significantly improving the mechanical properties. The method stipulates the upsetting speed, the amount of upsetting each time, and the pause time. The deformation amount of the forging upsetting process is well controllable and uniform, and it is easy to standardize the operation and realize high stability of process control. The product quality consistency of forgings of the same specification is very good. The concave die and the forming die are simple to design and assemble, have strong practicality, low production cost, can be reused, and have good economic benefits.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) The manufacturing method for improving the comprehensive performance of aluminum alloy forgings provided by the present invention can solve the problem of coarse grains in round aluminum alloy forgings due to the continuous forging process causing the temperature rise of the forgings, thereby solving the problem of unqualified forging performance. During the forging upsetting process of each billet, a specific speed is used to press down, the upsetting amount is limited each time, and an appropriate pause is made after each upsetting deformation to prevent the temperature rise inside and on the surface of the billet. The forging is changed from the traditional forging forming method: one upsetting formation, to first using a concave die for upsetting, and then using a forming die for upsetting forming, to ensure that the deformation of each area of ​​the billet is uniform during forging, and the deformation amount each time remains basically consistent, so that the forging has uniform deformation and thermoplastic deformation without temperature increase.

[0014] (2) The manufacturing method for improving the comprehensive performance of aluminum alloy forgings provided by the present invention can reduce the anisotropy problem of the mechanical properties of aluminum alloy forgings. The deformation is uniform and uniform throughout the forging process, and the anisotropic performance of the forgings can be easily guaranteed. By adding a concave die upsetting deformation process design, the various regions of the blank are deformed uniformly during upsetting, the height is reduced during the upsetting process, and the outer diameter is increased. The height direction is the active deformation direction, and the radial direction is the passive deformation direction. The height deformation causes the metal to flow in the radial direction in a hot state, and deformation occurs in the height and radial directions at the same time. Increasing the radial and height deformations can increase the uniform deformation capacity of each region of the matrix during the forging process, thereby making the anisotropic performance uniform and excellent.

[0015] (3) The manufacturing method for improving the comprehensive performance of aluminum alloy forgings provided by the present invention has simple process operation, fully taps the potential of existing equipment capabilities, is conducive to production control, and is also conducive to realizing analogical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is the finite element model of the round pancake-shaped 2A70 aluminum alloy ring forging;

[0018] Figure 2 Schematic diagram of starting upsetting with a concave die;

[0019] Figure 3 It is a schematic diagram of the concave die pause upsetting;

[0020] Figure 4 It is a schematic diagram of forging upsetting forming;

[0021] Figure 5 The size and shape diagram of the groove;

[0022] Figure 6 It is a structural schematic diagram of the forming mold. DETAILED DESCRIPTION

[0023] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0024] One aspect of the present invention relates to a manufacturing method for improving the comprehensive performance of an aluminum alloy forging, comprising the following steps:

[0025] (a) The heated bar is placed in a concave die for upsetting;

[0026] (b) placing the bar material after the upsetting in a forming die for upsetting;

[0027] (c) subjecting the forging obtained by the upsetting to solution heat treatment, cold deformation and aging.

[0028] The manufacturing method for improving the comprehensive performance of aluminum alloy forgings is to first perform upsetting in a concave die and then perform upsetting forming in a forming die, so as to ensure that each area of ​​the bar material is uniformly deformed during forging, and the deformation amount each time is kept basically the same, so that the forging is uniformly deformed and thermoplastic deformation without temperature increase is possible. The circular pancake-shaped aluminum alloy forging is deformed in both radial and high directions at the same time, so that the forging structure is uniform, and the radial tensile performance of the aluminum alloy circular pancake-shaped forging is significantly improved, the radial anisotropy of the tensile performance is significantly reduced, the grain structure of the forging is uniform, the surface low-magnification grain size is significantly reduced, and the high-magnification grain size structure is significantly improved. Both the low-magnification structure and the high-magnification structure are qualified, so that the comprehensive performance of the circular pancake-shaped aluminum alloy forging is significantly improved.

[0029] On the basis of the prior art, the present invention adopts a concave die for upsetting and a forming die for upsetting, controls the pressing speed and the single upsetting amount, thereby controlling the single upsetting deformation amount, adopts a specific pressing speed and pauses appropriately after pressing down for 50 to 60 mm, slowly and gradually changes the upsetting deformation amount to prevent temperature rise, thereby ensuring that the single pressing deformation amount during forging is controllable; during upsetting, a die is used to limit the shape of the circular forging to ensure that the product size is qualified; the concave die upsetting deformation can increase the uniform deformation capacity of each area of ​​the matrix during the forging process, improve the uniformity of the mechanical properties of each area of ​​the circular aluminum alloy forging, and ensure the product design performance requirements.

[0030] Furthermore, the temperature of the heat treatment is 420-450°C, including but not limited to any point value of 420°C, 430°C, 440°C or 450°C or a range value between any two of them.

[0031] Furthermore, the calculation formula for the heating treatment time is as follows:

[0032] Heating treatment time (min) = effective thickness of the bar (mm) × (1.5 to 3) min / mm (heating coefficient).

[0033] Furthermore, the calculation formula for the longest time of the heating treatment is as follows:

[0034] The maximum time of heating treatment (min) = effective thickness of the rod (mm) × (1.5~3) min / mm + 180 min.

[0035] Furthermore, the upsetting applies pressure downward from the top of the concave die along the height direction of the bar.

[0036] Further, the upsetting pressure is 2900-3100t, including but not limited to any point value of 2900t, 2920t, 2940t, 2960t, 2980t, 3000t, 3020t, 3040t, 3060t, 3080t or 3100t or a range value between any two of them.

[0037] Furthermore, the pressing speed of the upsetting is 2.2 to 4 mm / s, including but not limited to any point value of 2.2 mm / s, 2.4 mm / s, 2.6 mm / s, 2.8 mm / s, 3.0 mm / s, 3.2 mm / s, 3.4 mm / s, 3.6 mm / s, 3.8 mm / s or 4 mm / s or a range value between any two of them.

[0038] Furthermore, the upsetting includes several single upsettings, and the interval between each two adjacent single upsettings is 10 to 15 seconds. After completing one single upsetting, before the next upsetting, a pause is made, during which the forging hammer is lifted without applying pressure to the bar material. The next upsetting after a period of time can effectively reduce the temperature inside the bar material and prevent temperature rise.

[0039] Furthermore, the downward pressure of the single upsetting is 50-60 mm, including but not limited to any point value of 50 mm, 52 mm, 54 mm, 56 mm, 58 mm or 60 mm or a range value between any two of them.

[0040] Furthermore, the deformation amount of the single upsetting is 20% to 30%, including but not limited to any point value of 20%, 22%, 24%, 26%, 28% or 30% or a range value between any two of them.

[0041] The upsetting process is paused to allow the surface temperature of the forging and equipment to dissipate for a while, and then the upsetting is continued to prevent the temperature from rising during the forging process. Controlling the upsetting amount and pause time each time can ensure that the forging has a certain amount of deformation and the temperature rise during the forging process is not high, thereby achieving stable and controllable control of the forging production process, and can also improve the comprehensive performance of aluminum alloy round forgings, break through the technical bottleneck of aluminum alloy round forgings, improve the tensile strength, yield strength and elongation of the forgings, and refine the grains at the same time.

[0042] Further, the concave mold includes: a first extrusion part and a second extrusion part;

[0043] The first extrusion part is provided with a first groove; the second extrusion part is provided with a second groove; the first groove and the second groove are arranged face to face, and the first groove and the second groove are used for placing and fixing the bar material.

[0044] The shape and size of the groove on the extrusion part can be adjusted according to the size and size of the bar material, as long as the requirements of the final product are met. In some specific embodiments, the shape and size of the groove on the extrusion part are as follows: Figure 5 As shown, the outer diameter of the die is Φ410mm and the total height is 139mm. The diameter of the groove part is Φ80mm, the depth is 60mm, and the slope is 45°.

[0045] During the upsetting process, the two ends of the bar are respectively stuck in the first groove and the second groove, and the bar is fixed at the same time. After the bar is fixed, a certain pressure is applied to the extrusion part of the concave die to complete the upsetting. Upsetting the bar in the concave die can make the forging process uniform, and the pressure deformation of each forging upsetting is uniform, so as to improve the uniformity of the forging structure, thereby significantly improving the mechanical properties.

[0046] Furthermore, the upsetting forming pressure is 2900-3100t, including but not limited to any point value of 2900t, 2920t, 2940t, 2960t, 2980t, 3000t, 3020t, 3040t, 3060t, 3080t or 3100t or a range value between any two of them.

[0047] Furthermore, the pressing speed of the upsetting forming is 2.2-4 mm / s, including but not limited to any point value of 2.2 mm / s, 2.4 mm / s, 2.6 mm / s, 2.8 mm / s, 3 mm / s, 3.2 mm / s, 3.4 mm / s, 3.6 mm / s, 3.8 mm / s or 4 mm / s or a range value between any two of them.

[0048] Furthermore, the upsetting forming includes several single upsetting formings, and the interval between each two adjacent single upsetting formings is 10 to 15 seconds, including but not limited to any point value of 10 seconds, 11 seconds, 12 seconds, 13 seconds, 14 seconds or 15 seconds or the range value between any two of them.

[0049] Furthermore, the downward pressure of the single upsetting forming is 50-60 mm, including but not limited to any point value of 50 mm, 52 mm, 54 mm, 56 mm, 58 mm or 60 mm or a range value between any two of them.

[0050] Furthermore, the deformation amount of the single upsetting forming is 30% to 40%, including but not limited to any point value of 30%, 32%, 34%, 36%, 38% or 40% or a range value between any two of them.

[0051] Furthermore, the forming die is used to limit the outer dimensions of the forging during the upsetting forming, and the forming die is as follows: Figure 6 As shown, the forming die is in the shape of a ring.

[0052] The size of the forming die can be adaptively adjusted according to the size of the bar stock and the requirements of the performance of the final product. In some specific embodiments, the outer diameter of the forming die is Φ500mm, the inner diameter is Φ285.3mm, and the height is 78.6mm. During the upsetting forming, the forging blank is placed in the middle of the annular forming die, and the blank is formed in the forming die by applying pressure to the blank in the axial direction. The formed blank is in the shape of a round cake with a size of Φ282mm×77mm.

[0053] Furthermore, the temperature of the solution heat treatment is 525-535°C, including but not limited to any point value of 525°C, 527°C, 529°C, 531°C, 533°C or 535°C, or a range between any two of them.

[0054] Furthermore, the time of the solution heat treatment is 150 to 3000 min, including but not limited to any one of 150 min, 250 min, 450 min, 650 min, 850 min, 1050 min, 1250 min, 1450 min, 1650 min, 1850 min, 2050 min, 2250 min, 2450 min, 2650 min, 2850 min or 3000 min or the range between any two of them.

[0055] Furthermore, the deformation amount of the cold deformation is 2% to 3%, including but not limited to any point value of 2%, 2.2%, 2.4%, 2.6%, 2.8% or 3%, or a range value between any two of them.

[0056] Furthermore, the aging temperature is 185-195°C, including but not limited to any point value of 185°C, 187°C, 189°C, 191°C, 193°C or 195°C or a range between any two of them.

[0057] Furthermore, the aging time is 11 to 12 hours, including but not limited to any one of 11 hours, 11.2 hours, 11.4 hours, 11.6 hours, 11.8 hours or 12 hours, or a range between any two of them.

[0058] The present invention does not specifically limit the type of aluminum alloy, and conventional aluminum alloys in the art can use the manufacturing method provided by the present invention to improve their comprehensive performance. In some specific embodiments, the aluminum alloy includes but is not limited to: 2A70 aluminum alloy.

[0059] The manufacturing method for improving the comprehensive performance of aluminum alloy forgings can produce round-shaped aluminum alloy forgings that meet the following requirements:

[0060] (1) Macro grain size: The macro grain size of the entire circular end surface of the forging is tested according to GB / T 3246.2-2012. The grain size within the range of Φ70mm in the center of the forging is ≤ Grade 3, and the grain size at other locations is ≤ Grade 2.

[0061] (2) High-magnification grain size: The high-magnification grain size of forgings shall be tested according to YB / T 5148, and the grain size shall be ≥ Grade 4.

[0062] (3) Macrostructure: There shall be no defects such as cracks, delamination, segregation aggregation and non-metallic inclusions on the macrostructure of the forging.

[0063] (4) Microstructure: The microstructure of the forging must not be overburned.

[0064] (5) Room temperature mechanical properties: 5 radial roots evenly distributed: σ b ≥410MPa,σ0.2 ≥350MPa, δ5≥8%; HB≥120.

[0065] Furthermore, the forging hammer head and the production die are preheated to 150-250°C during the upsetting process.

[0066] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0067] Example 1

[0068] The manufacturing method for improving the comprehensive performance of aluminum alloy forgings provided in this embodiment comprises the following steps:

[0069] Step 1: Heat the bar material for forging at 435°C, and the holding time is calculated according to the effective thickness of the bar material (mm) × 2min / mm;

[0070] Step 2: Place the bar material after the heat treatment in step 1 into the concave die, and use a 3000t press to press down along the height direction of the bar material for upsetting. The pressing speed is 3mm / s. The upsetting includes several single upsettings. The forging hammer is lifted and paused for 13s between each two adjacent single upsettings. The pressing amount of a single upsetting is 55mm, and the deformation of a single upsetting is 25%. Figure 2 As shown;

[0071] Depend on Figure 3 It can be seen that as the amount of upsetting increases, the temperature inside the bar gradually increases, so a pause is necessary;

[0072] Step 3: After the concave die upsetting in step 2 is completed, the bar is placed in the forming die, and the 3000t press presses down along the height direction of the bar at a specific speed for upsetting, and the deformation of the upsetting is 35%;

[0073] like Figure 4 As shown, because a forming die is used, the forging has a regular shape and is generally in the shape of a round cake;

[0074] Step 4: Perform solution heat treatment on the forgings completed in step 3, solution heating temperature: 530°C, put into warm charging furnace, keep warm for 180min, and water cool;

[0075] Step 5: Cold deform the forgings piece by piece, and use a special height limit block to limit the deformation to ensure that the cold deformation is 2.5%;

[0076] Step 6: The heating temperature for aging is 190°C, the temperature rises with the furnace, the insulation time is 11.5 hours, and air cooling;

[0077] Step 7: Detect the low-magnification grain size, high-magnification grain size, room temperature mechanical properties, low-magnification structure and microstructure of the forging;

[0078] Step 8: After passing the physical and chemical tests, the forgings will be inspected and put into storage.

[0079] Example 2

[0080] The manufacturing method for improving the comprehensive performance of aluminum alloy forgings provided in this embodiment comprises the following steps:

[0081] Step 1: Same as Example 1;

[0082] Step 2: Place the bar material after the heat treatment in step 1 into the concave die, and use a 3050t press to press down along the height direction of the bar material for upsetting. The pressing speed is 3.5mm / s. The upsetting includes several single upsettings. The forging hammer is lifted and paused for 12s between each two adjacent single upsettings. The pressing amount of a single upsetting is 57mm, and the deformation of a single upsetting is 22%;

[0083] Step 3: After the concave die upsetting in step 2 is completed, the bar is placed in the forming die, and the 3080t press machine presses down at a specific speed along the height direction of the bar to perform upsetting forming, and the deformation of the upsetting forming is 33%;

[0084] Step 4: Perform solution heat treatment on the forgings completed in step 3, solution heating temperature: 532°C, put into warm charging furnace, keep warm for 230min, and water cool;

[0085] Step 5: Cold deform the forgings piece by piece, and use a special height limit block to limit the deformation to ensure that the cold deformation is 2.8%;

[0086] Step 6: The heating temperature for aging is 193°C, the temperature rises with the furnace, the holding time is 11.3h, and air cooling;

[0087] Step 7 to Step 8: Same as Example 1.

[0088] Example 3

[0089] The manufacturing method for improving the comprehensive performance of aluminum alloy forgings provided in this embodiment comprises the following steps:

[0090] Step 1: Same as Example 1;

[0091] Step 2: Place the bar material after the heat treatment in step 1 into a concave die, and use a 2900t press machine to press down along the height direction of the bar material for upsetting. The pressing speed is 2.2mm / s. The upsetting includes several single upsettings. The forging hammer is lifted and paused for 10s between each two adjacent single upsettings. The pressing amount of a single upsetting is 50mm, and the deformation of a single upsetting is 20%;

[0092] Step 3: After the concave die upsetting in step 2 is completed, the bar is placed in the forming die, and the 2900t press machine presses down at a specific speed along the height direction of the bar to perform upsetting forming, and the deformation of the upsetting forming is 30%;

[0093] Step 4: Perform solution heat treatment on the forgings completed in step 3, solution heating temperature: 525°C, put into warm charging furnace, keep warm for 150min, and water cool;

[0094] Step 5: Cold deform the forgings piece by piece, and use a special height limit block to limit the deformation to ensure that the cold deformation is 2%;

[0095] Step 6: The heating temperature for aging is 190°C, the temperature rises with the furnace, the insulation time is 11 hours, and air cooling;

[0096] Step 7 to Step 8: Same as Example 1.

[0097] Example 4

[0098] The manufacturing method for improving the comprehensive performance of aluminum alloy forgings provided in this embodiment comprises the following steps:

[0099] Step 1: Same as Example 1;

[0100] Step 2: Place the bar material after the heat treatment in step 1 into the concave die, and use a 3100t press machine to press down along the height direction of the bar material for upsetting. The pressing speed is 4mm / s. The upsetting includes several single upsettings. The forging hammer is lifted and paused for 15s between each two adjacent single upsettings. The pressing amount of a single upsetting is 60mm, and the deformation of a single upsetting is 30%;

[0101] Step 3: After the concave die upsetting in step 2 is completed, the bar is placed in the forming die, and the 3100t press machine presses down along the height direction of the bar at a specific speed for upsetting, and the deformation of the upsetting forming is 40%;

[0102] Step 4: The forgings completed in step 3 are subjected to solution heat treatment, the solution heating temperature is 535°C, the forgings are placed in a warm furnace, the holding time is 3000 min, and the forgings are water cooled;

[0103] Step 5: Cold deform the forgings piece by piece, and use a special height limit block to limit the deformation to ensure that the cold deformation is 3%;

[0104] Step 6: The heating temperature for aging is 195°C, the temperature rises with the furnace, the insulation time is 12 hours, and air cooling;

[0105] Step 7 to Step 8: Same as Example 1.

[0106] Comparative Example 1

[0107] The difference between this comparative example and Example 1 is only that in step 2, the upsetting is not performed in a concave die, and the bar material after the heating treatment is directly upset.

[0108] Comparative Example 2

[0109] The difference between this comparative example and Example 1 is only that in step 3, the upsetting forming is not performed in the forming die, and the bar material is directly upsetting formed after the upsetting is completed.

[0110] Comparative Example 3

[0111] The difference between this comparative example and Example 1 is that in step 2, two adjacent single upsettings are performed continuously.

[0112] Experimental example

[0113] The comprehensive performance test results of the round-shaped 2A70 aluminum alloy forging products manufactured in various embodiments and comparative examples are shown in Table 1.

[0114] Table 1 Comprehensive performance test results of products

[0115]

[0116] It can be seen from Table 1 that the aluminum alloy forgings manufactured by the manufacturing method for improving the comprehensive performance of aluminum alloy forgings provided by the present invention have excellent comprehensive performance, which shows that the present invention solves the technical problem to be solved.

[0117] Although the present invention has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents without departing from the spirit and scope of the present invention. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. A manufacturing method for improving the comprehensive performance of aluminum alloy forgings, characterized in that: The following steps are involved: (a) The heated bar is placed in a concave die for upsetting; (b) placing the bar material after the upsetting in a forming die for upsetting; (c) subjecting the forging obtained by the upsetting to solution heat treatment, cold deformation and aging.

2. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 1, characterized in that: Includes at least one of the following technical features: (1) The upsetting is performed by applying pressure downward from the top of the concave die along the height direction of the bar; (2) The upsetting pressure is 2900-3100t; (3) The pressing speed of the upsetting is 2.2 to 4 mm / s.

3. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 1, characterized in that: The upsetting includes several single upsettings, and an interval of 10 to 15 seconds is between every two adjacent single upsettings.

4. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 3, characterized in that: The downward pressure of the single upsetting is 50 to 60 mm; Preferably, the deformation amount of the single upsetting is 20% to 30%.

5. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 1, characterized in that: The concave mold comprises: a first extrusion part and a second extrusion part; The first extrusion part is provided with a first groove; the second extrusion part is provided with a second groove; the first groove and the second groove are arranged face to face, and the first groove and the second groove are used for placing and fixing the bar material.

6. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 1, characterized in that: Includes at least one of the following technical features: (1) The upsetting pressure is 2900-3100t; (2) The pressing speed of the upsetting forming is 2.2 to 4 mm / s; (3) The upsetting forming includes several single upsetting formings, and the interval between each two adjacent single upsetting formings is 10 to 15 seconds; the pressing amount of the single upsetting forming is 50 to 60 mm; and the deformation amount of the single upsetting forming is 30% to 40%.

7. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 1, characterized in that: When performing the upsetting forming, the outer dimensions of the forged piece are limited by using the forming die, and the forming die is in a ring shape.

8. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 1, characterized in that: The temperature of the solution heat treatment is 525-535°C; And / or, the solution heat treatment time is 150 to 3000 minutes.

9. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 1, characterized in that: The cold deformation amount is 2% to 3%.

10. The manufacturing method for improving the comprehensive performance of aluminum alloy forgings according to claim 1, characterized in that: The aging temperature is 185-195°C; And / or, the aging time is 11 to 12 hours.

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