Symmetrical forging forming method for large aluminum alloy flat plate frame forgings
Through the symmetric forging forming method, the problem of low material utilization and forming load exceeding the tonnage limit of the press during the forming process of large aluminum alloy flat frame forgings is solved, efficient forming on existing equipment is achieved and processing efficiency is improved.
Patent Information
- Application Number
- CN202411828312.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-03-11
AI Technical Summary
During the forming process of large aluminum alloy flat frame forgings, traditional methods lead to low material utilization, low mechanical processing efficiency, and the forming load exceeds the existing tonnage limit of the press, making it difficult to achieve effective forming.
The symmetric forging forming method is adopted, and the upper and lower dies of the symmetric forging mold are preheated and installed, and the forging is heated to 350-450°C, and then the left and right sections are forged respectively. The upper die is driven downward by a press to complete the forming of the forging.
The contact area between the mold and the aluminum alloy slab during the overall forging process is reduced, the forming load is reduced, and the overall forming of large aluminum alloy flat frame forgings is achieved on the existing 80,000-ton press equipment is completed, and the material utilization and processing efficiency are improved.
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Figure CN119588865A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of material forming, and in particular relates to a symmetrical forging forming method for a large aluminum alloy flat plate frame forging. Background Art
[0002] Large aluminum alloy flat frame forgings are often used in aerospace components. Due to their large structure, they are very difficult to manufacture. The traditional processing method uses mechanical processing, which results in low material utilization and low mechanical processing efficiency, thereby increasing costs; the forging method is used for forming. Due to the large overall size of the forging, the forming load during the overall forging exceeds 120,000 tons, which exceeds the tonnage limit of 80,000 tons of the world's largest press. Therefore, it is urgent to solve the forming problem of large aluminum alloy flat frame forgings. Summary of the invention
[0003] In order to solve the above technical problems, the present invention provides a symmetrical forging method for a large aluminum alloy flat frame forging.
[0004] The technical scheme is as follows: A symmetrical forging forming method for a large aluminum alloy flat frame forging includes a forming die, and its main points are: comprising the following steps:
[0005] S1. Preheating and installing the die: the forming die includes a symmetrical forging upper die and a symmetrical forging lower die, and the symmetrical forging upper die and the symmetrical forging lower die are preheated and respectively installed on the upper work surface and the lower work surface of the press;
[0006] S2. Forging heating: Heat the large aluminum alloy slab to 350-450℃;
[0007] S3. Forging of the left section: The left section of the heated large aluminum alloy slab is placed in the cavity of the symmetrical forging lower die, and the press is controlled to drive the symmetrical forging upper die to move downward, and the left section of the large aluminum alloy slab is forged;
[0008] S4. Right section forging: Rotate the large aluminum alloy slab 180° after the left section is formed, then put the unformed part of the large aluminum alloy slab into the cavity of the symmetrical forging lower die, control the press to drive the symmetrical forging upper die to move downward, and forge the right section of the large aluminum alloy slab to complete the forming of the large aluminum alloy flat frame forging.
[0009] Preferably, in step S3, one end of the cavity of the symmetrical forging lower die penetrates the side wall of the symmetrical forging lower die, the left section of the large aluminum alloy slab is placed in the cavity of the symmetrical forging lower die, and the right section of the large aluminum alloy slab passes through one side of the cavity.
[0010] Preferably, the length of the cavity of the symmetrical forging lower die is greater than half the length of the large aluminum alloy slab, wherein a section of the cavity of the symmetrical forging lower die that passes through one side wall is a forming transition zone.
[0011] Preferably, the forming load of the press during forging of the right section is greater than the forming load of the press during forging of the left section.
[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. It reduces the contact area between the die and the aluminum alloy slab during the overall forging process, thereby reducing the forming load during the overall forging process of large aluminum alloy flat frame forgings, and realizes its overall forging forming on the existing 80,000-ton press equipment; 2. It reduces the amount of mechanical processing of large aluminum alloy flat frame forgings, and improves material utilization and processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of a large aluminum alloy slab in the present invention;
[0014] Figure 2 It is the overall forging load distribution curve (1 / 4 simulation);
[0015] Figure 3 It is a schematic diagram of the forming mold structure in the present invention;
[0016] Figure 4 It is a schematic diagram of the forging forming of the left section in the present invention;
[0017] Figure 5 It is a schematic diagram of the forging forming of the right section in the present invention;
[0018] Figure 6 It is a schematic diagram of the structure of a large-scale aluminum alloy flat frame forging in the present invention;
[0019] Figure 7 It is a load distribution curve diagram of the symmetrical forging forming of the present invention. DETAILED DESCRIPTION
[0020] The present invention is further described below in conjunction with embodiments and drawings.
[0021] A symmetrical forging method for a large aluminum alloy flat frame forging, wherein the large aluminum alloy slab blank is selected as Figure 1 As shown, its specific dimensions are: length 1650mm, width 1450mm, height 50mm, its material is 7075 aluminum alloy, the structural diagram of the forming mold is as follows Figure 3 As shown, the forming method comprises the following steps:
[0022] S1. Preheating and installing the die: the forming die includes a symmetrical forging upper die and a symmetrical forging lower die, and the symmetrical forging upper die and the symmetrical forging lower die are preheated and respectively installed on the upper work surface and the lower work surface of the press;
[0023] S2. Forging heating: Heat the large aluminum alloy slab to 350-450℃;
[0024] S3. Left section forging: Figure 4 As shown, the left section of the heated large aluminum alloy slab is placed in the cavity of the symmetrical forging lower die, one end of the cavity of the symmetrical forging lower die penetrates the side wall of the symmetrical forging lower die, the left section of the large aluminum alloy slab is placed in the cavity of the symmetrical forging lower die, the right section of the large aluminum alloy slab passes through one side of the cavity, the length of the cavity of the symmetrical forging lower die is greater than half of the length of the large aluminum alloy slab, wherein a section of the cavity of the symmetrical forging lower die that penetrates one side wall is a forming transition zone, at this time, the press is controlled to drive the symmetrical forging upper die to move downward, and the left section of the large aluminum alloy slab is forged and deformed, and when the press is pressed to the pressing amount of 30mm set by the forming process, the press is controlled to drive the symmetrical forging upper die to stop moving downward, and the left section of the large aluminum alloy slab is forged and formed;
[0025] S4. Forging of the right section: Figure 5 As shown, the large aluminum alloy slab after the left section is formed is rotated 180°, and then the unformed part of the large aluminum alloy slab is placed in the cavity of the symmetrical forging lower die, and the press is controlled to drive the symmetrical forging upper die to move downward. When the press is pressed to the pressing amount of 30mm set by the forming process, the press is controlled to drive the symmetrical forging upper die to stop moving downward, and the right section of the large aluminum alloy slab is forged and formed, thereby completing the forming of the large aluminum alloy flat plate frame forging. The structure of the large aluminum alloy flat plate frame forging is shown in FIG. Figure 6 As shown, the specific structural dimensions are: length 2148mm, width 1452mm, height 52mm, the center web dimensions are: length 1808mm, 1097mm, thickness 20mm, and the distance from the upper plane is 21mm, and the distance from the lower plane is 11mm.
[0026] In the above steps, the length of the cavity of the symmetrical forging lower die is greater than half of the length of the large aluminum alloy slab, specifically: the length of the symmetrical forging upper die and the symmetrical forging lower die = 1 / 2 of the overall forging die + the length of the transition zone. The left section is forged to form the left half of the large aluminum alloy slab, so the forging after the left section is forged is longer than half of the actual designed forging, because the length of the symmetrical forging upper die and the symmetrical forging lower die is 1 / 2 of the length of the overall forging die plus the length of the transition zone. For the right section forging, it is necessary to turn the large aluminum alloy slab 180° and then forge to form the right half of the large aluminum alloy slab. At this time, when the billet is put into the symmetrical forging lower die, a small section of the large aluminum alloy slab just overlaps with the length of the transition zone of the symmetrical forging lower die. The overlapping length is the positioning dimension of the billet in the length direction when the right section is forged, and the overlapping part is also used as the positioning and guidance in the width direction; by designing the length of the transition zone, it can be ensured that the size of the forging after the left and right forgings is consistent with the overall forging.
[0027] In the above steps, the large aluminum alloy slab is heated once. The forging temperature range of 7075 aluminum alloy is 350-450℃. When forging, the left and right ends are forged respectively. The temperature of the forging will drop. Therefore, the forming load of the press during the forging of the right section is greater than the forming load of the press during the forging of the left section. Figure 6 As shown, the maximum forming load of the left section forging is 30,000 tons, and the maximum forming load of the right section forging is 33,900 tons, both of which are within the range of equipment use; 7075 aluminum alloy requires heat treatment after forging, so the effect of a slight drop in temperature on the structure can be ignored. Numerical simulation results show that the temperature drop has no effect on the forming size of the forging.
[0028] Combination Figure 2 and Figure 7 It can be seen that the maximum load during the forging process of the present invention is 33,900 tons, which is 71.8% less than the maximum load of 120,000 tons during the overall forging process, and can achieve the overall forming of large aluminum alloy flat frame forgings on the existing 80,000-ton press equipment.
[0029] In this embodiment, compared with directly machining a slab with a length of 2148 mm, a width of 1452 mm, and a height of 52 mm to manufacture large flat frame forgings, the use of a symmetrical forging forming method reduces the amount of machining by 39%, increases the material utilization rate by 26%, and significantly reduces the manufacturing cost of large aluminum alloy flat frame forgings.
[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.
Claims
1. A symmetrical forging method for a large aluminum alloy flat frame forging, comprising a forming die, characterized in that: The following steps are included: S1. Preheating and installing the die: the forming die includes a symmetrical forging upper die and a symmetrical forging lower die, and the symmetrical forging upper die and the symmetrical forging lower die are preheated and respectively installed on the upper work surface and the lower work surface of the press; S2. Forging heating: Heat the large aluminum alloy slab to 350-450℃; S3. Forging of the left section: The left section of the heated large aluminum alloy slab is placed in the cavity of the symmetrical forging lower die, and the press is controlled to drive the symmetrical forging upper die to move downward, and the left section of the large aluminum alloy slab is forged; S4. Right section forging: Rotate the large aluminum alloy slab 180° after the left section is formed, then put the unformed part of the large aluminum alloy slab into the cavity of the symmetrical forging lower die, control the press to drive the symmetrical forging upper die to move downward, and forge the right section of the large aluminum alloy slab to complete the forming of the large aluminum alloy flat frame forging.
2. The symmetrical forging method for a large aluminum alloy flat plate frame forging according to claim 1 is characterized in that: In step S3, one end of the cavity of the symmetrical forging lower die penetrates the side wall of the symmetrical forging lower die, the left section of the large aluminum alloy slab is placed in the cavity of the symmetrical forging lower die, and the right section of the large aluminum alloy slab passes through one side of the cavity.
3. A symmetrical forging method for a large aluminum alloy flat plate frame forging according to claim 2, characterized in that: The length of the cavity of the symmetrical forging lower die is greater than half the length of the large aluminum alloy slab, wherein a section of the cavity of the symmetrical forging lower die that passes through one side wall is a forming transition zone.
4. A symmetrical forging method for a large aluminum alloy flat plate frame forging according to claim 1, characterized in that: The forming load of the press during the forging of the right section is greater than the forming load of the press during the forging of the left section.