CN116475302A - Creep aging forming device and forming method for large thin-wall member - Google Patents
Creep aging forming device and forming method for large thin-wall member Download PDFInfo
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- CN116475302A CN116475302A CN202310329231.6A CN202310329231A CN116475302A CN 116475302 A CN116475302 A CN 116475302A CN 202310329231 A CN202310329231 A CN 202310329231A CN 116475302 A CN116475302 A CN 116475302A
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- 230000032683 aging Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 229910001148 Al-Li alloy Inorganic materials 0.000 claims description 4
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical group [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000001989 lithium alloy Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 4
- 241000219112 Cucumis Species 0.000 description 3
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 3
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
Abstract
The invention provides a creep aging forming device and a forming method for a large thin-wall member, wherein the forming device comprises a mechanical loading device, a die and an autoclave, and the mechanical loading device comprises a frame and a loading assembly; the frame comprises two side beams and a cross beam positioned between the two side beams, and two through holes are formed in the lower ends of the two side beams; the loading assembly comprises a fixed box fixed in the middle of the beam and a plurality of rows of screws which vertically penetrate through the fixed box in parallel, and the lower end of each screw is provided with a directional wheel; two through holes are formed in the mounting plates at the positions corresponding to the two side surfaces of one end of the die, and connecting lines of the two through holes in each mounting plate are perpendicular to the die surface. According to the invention, the part of the workpiece to be formed, which is easy to generate buckling instability, is propped against by the directional wheel, so that the part of the workpiece, which is easy to generate buckling instability, is always subjected to the pressure exerted by the directional wheel in the continuous loading process in the autoclave, and the buckling instability is effectively avoided.
Description
Technical Field
The invention relates to a creep aging forming device and a creep aging forming method for a large thin-wall member, and belongs to the technical field of aerospace manufacturing engineering.
Background
Creep aging forming is a novel sheet metal forming technology, can enable the member to be formed and strength to be improved at the same time, and is widely applied to manufacturing of aerospace members. The creep aging forming technology comprises three steps, namely, firstly, elastically deforming a plate material in a certain loading mode at normal temperature, and fixing the plate material on a die; then, the combination of the plate and the die is integrally put into an autoclave, and the plate is subjected to the actions of creep deformation and stress relaxation at a certain temperature and for a certain period of time, so that the internal tissues and mechanisms are changed; and finally, taking out the plate and the die, unloading the plate and the die, and obtaining the required components. In the technical field of aviation manufacturing engineering, a vacuum mold is generally adopted, namely, a plate is fixed on a mold with a concave surface, the air tightness between the plate and the mold is ensured, and then the concave cavity between the plate and the mold is vacuumized, so that the plate is tightly attached to the mold under the action of atmospheric pressure.
When manufacturing aerospace components, buckling instability phenomenon is very easy to occur in the creep aging forming process of the plate material, the buckling instability phenomenon is restrained by a method of adding metal strips or metal plates to the plate material in the patent CN 111575615B, the patent CN 111195677A and the patent CN 111195678A, but the method is limited to producing small components, such as small melon flap components with the storage tank diameter of 3.35 meters and below, for large thin-wall components, buckling instability phenomenon can not be restrained by increasing the rigidity of the plate material by increasing the metal plates continuously, even the loading process is not easy to be attached to a die due to excessive number of the metal plates, and meanwhile, the production cost is greatly increased. The devices of the patent CN 110899481A and the patent CN 112338052A have complex structures and high manufacturing cost, are not suitable for being applied to the generation of large thin-wall components, 95% of load in the creep aging forming technology is completed in an autoclave, the buckling instability phenomenon of the plate generally occurs in the loading stage after the plate is fed into the autoclave, and the inventor finds that the method still has the defects for the generation of the large thin-wall components in practical research. In the production process of large melon petals with the diameter of the storage tank being larger than 3.35 meters, the workpiece to be formed is an isosceles trapezoid plate, and experiments show that the serious buckling instability phenomenon easily occurs in the middle of the long side in the bottom edge of the isosceles trapezoid plate in the loading stage of the autoclave, and the problem cannot be well solved in the prior art.
Disclosure of Invention
The invention aims at the problems to be solved, and provides a creep aging forming device and a forming method for a large thin-wall member, which are used for propping up the part of a workpiece to be formed, which is easy to generate buckling instability phenomenon, through a mechanical loading device when the workpiece to be formed is in the loading stage of an autoclave, so that the buckling instability phenomenon of the workpiece to be formed in the loading stage of the autoclave is effectively avoided.
In order to solve the technical problems, the invention provides a creep age forming device for a large thin-wall member, which comprises a mechanical loading device, a die and an autoclave, wherein the mechanical loading device comprises a frame and a loading assembly;
the frame comprises two side beams and a cross beam positioned between the two side beams, and two through holes are formed in the lower ends of the two side beams;
the loading assembly comprises a fixed box fixed in the middle of the beam and a plurality of rows of screws which are parallel and vertically penetrated through the fixed box, each row of screws is provided with at least one screw, each screw is provided with two nuts, the two nuts are respectively positioned above and below the fixed box, and the lower end of each screw is provided with a directional wheel;
mounting plates matched with the side beams are arranged at the corresponding positions of the two side surfaces of one end of the die, two through holes are formed in each mounting plate, the connecting lines of the two through holes in each mounting plate are perpendicular to the die surface, and the two through holes in each mounting plate correspond to the two through holes in the corresponding side beams one by one;
the method comprises the steps that a to-be-formed workpiece wrapped in an airfelt is placed on a die, the to-be-formed workpiece is an isosceles trapezoid plate, the long edge in the bottom edge of the to-be-formed workpiece is placed at one end of a mounting plate matched with a side beam of the die, the to-be-formed workpiece is sealed in a closed space formed by the vacuum bag and the die by using high-temperature glue and the vacuum bag, the vacuum bag is vacuumized, two through holes in each side beam are connected with two through holes in the mounting plate through bolts, a rack is fixed at one end of the die through the corresponding through holes in the mounting plate, when the rack is fixed at one end of the die, each screw is perpendicular to the die surface, the direction of the axis of a directional wheel corresponding to the screw can be adjusted through rotating each screw, the position of each screw can be adjusted through adjusting a nut on each screw, each screw is fixed, when each screw is fixed, the axis of the directional wheel corresponding to the long edge of the to-be-formed workpiece is parallel to the through holes in the side beam, and the axis of the directional wheel corresponding to the through holes in the mounting plate are connected with the through holes in the side beam, and the assembled whole combination is placed into a hot-pressing tank.
Preferably, a cushion block which enables the vacuum bag not to contact all the directional wheels is arranged between the vacuum bag and all the directional wheels, and the cushion block is made of ventilated felt-packaged silica gel.
Preferably, the three rows of screws are sequentially provided with one screw, three screws and one screw, and the five screws are arranged in a "+" shape.
Preferably, the thickness of the silica gel is 3mm.
Correspondingly, the invention also provides a creep aging forming method of the large thin-wall component, which comprises the following steps:
step 1, cutting isosceles trapezoid plates for creep aging forming by using plates meeting requirements, taking the isosceles trapezoid plates as workpieces to be formed, placing the workpieces to be formed wrapped in an airfelt on a die, placing long sides in the bottom edges of the workpieces to be formed at one end of the die, which is provided with a mounting plate matched with a side beam, sealing the workpieces to be formed in a closed space formed by a vacuum bag and the die by using high-temperature glue and the vacuum bag, and vacuumizing the vacuum bag;
step 2, after vacuumizing treatment, connecting two through holes on each side beam with two corresponding through holes on the mounting plate by bolts to fix the frame at one end of the die, wherein each screw is vertical to the molded surface of the die when the frame is fixed at one end of the die;
step 3, rotating each screw rod, enabling the shaft of the corresponding directional wheel to be parallel to the bolt connecting the through hole on the mounting plate and the through hole on the side beam, placing the cushion block between the vacuum bag and all the directional wheels, then adjusting the nut on each screw rod to adjust the position of each screw rod and fix each screw rod, clamping the corresponding screw rod by using a clamp when adjusting the nut on the screw rod, enabling the shaft of the directional wheel at the lower end of the screw rod to be parallel to the bolt connecting the through hole on the mounting plate and the through hole on the side beam, and enabling the directional wheel corresponding to each screw rod to prop against the middle part of the long side in the bottom edge of the workpiece to be formed when each screw rod is fixed;
and 4, integrally placing the combination of the mechanical loading device, the die and the workpiece to be formed into an autoclave for vacuum creep aging forming, separating the mechanical loading device, the die and the workpiece to be formed after the vacuum creep aging forming is finished, and cutting off the allowance area of the workpiece to be formed, thus finishing the manufacture of the large thin-wall component.
Preferably, both ends of the long side of the bottom edge of the workpiece to be formed are cut out by the same length to eliminate the acute angle of the workpiece to be formed before the workpiece to be formed is wrapped in the airfelt.
Preferably, the upper bottom of the workpiece to be formed is 610mm, the lower bottom of the workpiece to be formed is 2100mm, the height of the workpiece to be formed is 2650mm, the thickness of the workpiece to be formed is 3-6 mm, and both ends of the lower bottom of the workpiece to be formed are cut off by 50mm so as to eliminate an acute angle of the workpiece to be formed.
Preferably, the plate material meeting the requirements is an aluminum lithium alloy plate.
Preferably, the autoclave is continuously loaded with a positive pressure of 1.9MPa during the vacuum creep age forming.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the plurality of directional wheels of the mechanical loading device are propped against the part of the workpiece to be formed, which is easy to generate buckling instability, in the process of continuously loading the workpiece to be formed in the autoclave, as the directional wheels can roll on the workpiece to be formed, the plurality of screws are vertical to the mold surface, the shaft of each directional wheel is parallel to the bolt connecting the through hole on the mounting plate and the through hole on the side beam, the direction of each directional wheel is consistent with the loading moving direction of the workpiece to be formed, the middle part of the long side in the bottom edge of the workpiece to be formed is always subjected to the pressure exerted by the directional wheels, thus the buckling instability of the workpiece to be formed is effectively avoided, the stable large thin-wall member is successfully produced, and meanwhile, the scratch on the surface of the large thin-wall member can be avoided.
2. The mechanical loading device effectively restricts the movement of the workpiece to be formed, avoids the phenomenon that the workpiece to be formed moves due to the vibration of hot air and an autoclave, ensures that the workpiece to be formed is positioned in an effective area of a mold surface, and greatly improves the forming precision of a large thin-wall member.
3. The invention has simple structure, simple operation and low cost.
Drawings
Fig. 1 is a schematic structural view of a mechanical loading device according to the present invention.
Fig. 2 is a side view of the mold of the present invention.
Fig. 3 is a schematic structural view of the loading assembly, the workpiece to be formed and the die according to the present invention.
Fig. 4 is a schematic view of a workpiece to be formed according to the present invention.
FIG. 5 is a schematic view of a large thin-walled component (without the margin cut) obtained by the method of the present invention.
Reference numerals: the device comprises a side beam 1, a directional wheel 2, a cross beam 3, a nut 4, a screw 5, a die 6, a mounting plate 7, a workpiece 8 to be formed and a fixed box 9.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
As shown in fig. 1 to 3, a creep age forming device for a large thin-wall member comprises a mechanical loading device, a die 6 and an autoclave, wherein the mechanical loading device comprises a frame and a loading assembly;
the frame comprises two side beams 1 and a cross beam 3 positioned between the two side beams 1, wherein two through holes are formed in the lower ends of the two side beams 1;
the loading assembly comprises a fixed box 9 fixed in the middle of the cross beam 3 and a plurality of rows of screw rods 5 which vertically penetrate through the fixed box 9 in parallel, at least one screw rod 5 is arranged in each row of screw rods 5, each screw rod 5 is provided with two nuts 4, the two nuts 4 are respectively positioned above and below the fixed box 9, the lower end of each screw rod 5 is provided with a directional wheel 2, and each screw rod 5 is parallel to the side beam 1;
the two corresponding positions of the two side surfaces of one end of the die 6 are respectively provided with a mounting plate 7 matched with the side beams 1, each mounting plate 7 is provided with two through holes, the connecting line of the two through holes on each mounting plate 7 is perpendicular to the die surface, and the two through holes on each mounting plate 7 are in one-to-one correspondence with the two through holes on the corresponding side beams 1;
placing a workpiece 8 to be formed wrapped in an airfelt on a die 6, wherein the workpiece 8 to be formed is an isosceles trapezoid plate material, placing the long side of the bottom edge of the workpiece 8 to be formed on one end of the die 6 provided with a mounting plate 7 matched with the side beam 1, sealing the workpiece 8 to be formed in a closed space formed by a vacuum bag and the die 6 by using high-temperature glue and the vacuum bag, and vacuumizing the vacuum bag;
the two through holes on each side beam 1 are connected with the two corresponding through holes on the mounting plate 7 through bolts to fix the frame at one end of the die 6, when the frame is fixed at one end of the die 6, each screw 5 is perpendicular to the die surface, the direction of the shaft of the corresponding directional wheel 2 can be adjusted by rotating each screw 5, the position of each screw 5 can be adjusted and each screw 5 can be fixed by adjusting the nut 4 on each screw 5, when each screw 5 is fixed, the corresponding directional wheel 2 is propped against the middle part of the long edge in the bottom edge of the workpiece 8 to be formed, the shaft of the corresponding directional wheel 2 is parallel to the bolts connecting the through holes on the mounting plate 7 with the through holes on the side beam 1, the orientation of the corresponding directional wheel 2 is consistent with the loaded moving direction of the workpiece 8 to be formed, preferably, a cushion block which enables the vacuum bag to be out of contact with all the directional wheels 2 is arranged between the vacuum bag, so that the cushion block is a vacuum bag is prevented from being scratched, and the thickness of the cushion block is preferably 3mm;
the assembled mechanical loading device, the die 6 and the workpiece 8 to be formed are integrally placed in the autoclave, the workpiece 8 to be formed can roll on the workpiece 8 to be formed in the continuous loading process of the autoclave, the direction of each directional wheel 2 is consistent with the loaded moving direction of the workpiece 8 to be formed, and the middle part of the long edge in the bottom edge of the workpiece 8 to be formed is always subjected to the pressure exerted by the directional wheels 2 on the workpiece 8 to be formed, so that buckling instability phenomenon of the workpiece 8 to be formed is effectively avoided.
Preferably, the three rows of screws 5 are arranged, one screw, three screws and one screw are sequentially arranged in the three rows of screws 5, the five screws are arranged in a "+" shape, and when the workpiece 8 to be formed moves under load, the directional wheels 6 are used for applying pressure to the workpiece, so that buckling instability of the workpiece is effectively avoided.
A creep aging forming method of a large thin-wall component comprises the following steps:
step 1, cutting isosceles trapezoid plates for creep aging forming by using plates meeting requirements, taking the isosceles trapezoid plates as a workpiece 8 to be formed, preferably cutting the same length at two ends of a long side in the bottom edge of the workpiece 8 to be formed before wrapping the workpiece 8 to be formed in a airfelt to eliminate an acute angle of the workpiece to be formed, effectively avoiding scratching a die 6, and placing the workpiece 8 to be formed on the die after the workpiece 8 to be formed is cleaned by kerosene and alcohol, wrapping the workpiece 8 to be formed in the airfelt, placing the long side in the bottom edge of the workpiece 8 to be formed at one end of the die 6 provided with a mounting plate 7 matched with a side beam 1, sealing the workpiece 8 to be formed in a closed space formed by a vacuum bag and the die 6 by using high-temperature glue and the vacuum bag, and vacuumizing the vacuum bag, wherein the workpiece 8 to be formed is subjected to atmospheric pressure load of 0.1MPa after vacuumizing treatment is completed;
step 2, after the vacuumizing treatment is finished, the two through holes on each side beam 1 and the two through holes corresponding to the through holes on the mounting plate 7 are connected through bolts, the frame is fixed at one end of the die 6, and when the frame is fixed at one end of the die 6, each screw 5 is perpendicular to the molded surface of the die;
step 3, rotating each screw 5, after enabling the shaft of the corresponding orientation wheel 2 to be parallel to the bolt connecting the through hole on the mounting plate 7 and the through hole on the side beam 1, placing a cushion block between a vacuum bag and all the orientation wheels 2 to avoid the orientation wheels from scratching the vacuum bag, then adjusting the nut 4 on each screw 5 to adjust the position of each screw 5 and fix each screw 5, clamping the corresponding screw 5 by a clamp when adjusting the nut on each screw 5 to enable the shaft of the orientation wheel 2 at the lower end of the screw 5 to be parallel to the bolt connecting the through hole on the mounting plate 7 and the through hole on the side beam 1, enabling the orientation of the orientation wheel 2 at the lower end of the screw 5 to be consistent with the loaded moving direction of the workpiece 8 to be formed, and when each screw 5 is fixed, enabling the orientation wheel 2 corresponding to be propped against the middle part of the long side in the bottom edge of the workpiece 8 to be formed, and adopting a diagonal, crossed and alternate mode to be adjusted for multiple times when adjusting the nut 8 to prevent uneven stress of a loading assembly, thereby causing deformation of the screw 8, and after the screw 8 is fixed, monitoring each bolt by a fixed torque wrench, wherein the value of each bolt is not less than 100 m;
in the continuous loading process of the workpiece 8 to be formed in the autoclave, the directional wheels 2 can roll on the workpiece 8 to be formed, the direction of each directional wheel 2 is consistent with the loaded moving direction of the workpiece 8 to be formed, and the middle part of the long side in the bottom edge of the workpiece 8 to be formed is always subjected to the pressure exerted by the directional wheels 2 on the workpiece, so that buckling instability phenomenon of the workpiece 8 to be formed is effectively avoided;
and 4, integrally placing the combination of the mechanical loading device, the die 6 and the workpiece 8 to be formed into an autoclave for vacuum creep aging forming, separating the mechanical loading device, the die 6 and the workpiece 8 to be formed after the vacuum creep aging forming is finished, and cutting off the allowance area of the workpiece 8 to be formed, thus finishing the manufacture of the large thin-wall component.
Preferentially, the upper bottom of the workpiece 8 to be formed is 610mm, the lower bottom is 2100mm, the height is 2650mm, the thickness of the workpiece to be formed is 3-6 mm, so that melon petals with the diameter of the storage tank of 5 meters are produced, and both ends of the lower bottom of the workpiece 8 to be formed are cut off by 50mm to eliminate acute angles of the workpiece to be formed, so that the die is effectively prevented from being scratched.
Preferentially, the material of the workpiece 8 to be formed is an aluminum-lithium alloy plate, and the aluminum-lithium alloy plate has the characteristics of low density, high specific strength and high specific modulus, and has good application prospect in the field of aerospace (such as rocket storage tanks).
Preferably, a positive pressure of 1.9MPa is continuously applied to the autoclave during vacuum creep age forming.
The workpiece 8 to be formed is subjected to a load of 2MPa during vacuum creep age forming, the middle part of the long side in the bottom edge of the workpiece 8 to be formed is always subjected to the pressure exerted by the directional wheel 2, so that buckling instability phenomenon of the workpiece 8 to be formed is effectively avoided, meanwhile, the directional wheel 2 props against the workpiece 8 to be formed to prevent the workpiece 8 to be formed from moving due to vibration of hot air and an autoclave, and a large thin-wall component with good stability and high precision is generated, as shown in fig. 5.
The foregoing is a further detailed description of the invention in connection with specific preferred embodiments, and is not intended to limit the practice of the invention to such description. It will be apparent to those skilled in the art that several simple deductions and substitutions can be made without departing from the spirit of the invention, and these are considered to be within the scope of the invention.
Claims (9)
1. The creep aging forming device for the large thin-wall member is characterized by comprising a mechanical loading device, a die (6) and an autoclave, wherein the mechanical loading device comprises a frame and a loading assembly;
the frame comprises two side beams (1) and a cross beam (3) positioned between the two side beams (1), wherein two through holes are formed in the lower ends of the two side beams (1);
the loading assembly comprises a fixed box (9) fixed in the middle of the cross beam (3) and a plurality of rows of screws (5) which are parallel and vertically penetrate through the fixed box (9), each row of screws (5) is provided with at least one screw (5), each screw (5) is provided with two nuts (4), the two nuts (4) are respectively positioned above and below the fixed box (9), and the lower end of each screw (5) is provided with a directional wheel (2);
mounting plates (7) matched with the side beams (1) are arranged at positions corresponding to two side surfaces at one end of the die (6), two through holes are formed in each mounting plate (7), connecting lines of the two through holes in each mounting plate (7) are perpendicular to the die surface, and the two through holes in each mounting plate (7) correspond to the two through holes in the corresponding side beam (1) one by one;
the method comprises the steps that a workpiece (8) to be formed wrapped in an airfelt is placed on a die (6), the workpiece (8) to be formed is an isosceles trapezoid plate, the long side of the bottom side of the workpiece (8) to be formed is placed at one end of a mounting plate matched with a side beam (1) in the die (8), the workpiece (8) to be formed is sealed in a closed space formed by the vacuum bag and the die (6) by using high-temperature glue and a vacuum bag, the vacuum bag is vacuumized, two through holes on each side beam (1) are connected with two through holes corresponding to the two through holes on the mounting plate (7) through bolts to fix a frame at one end of the die (6), when the frame is fixed at one end of the die (6), each screw rod (5) is perpendicular to the die surface, the direction of a shaft of a directional wheel (2) corresponding to the frame is adjusted by rotating each screw rod (6), the position of each screw rod (5) is adjusted by adjusting the position of each screw rod (5) and fixing each screw rod (5), when each screw rod (5) is fixed, the two through holes on each screw rod (5) are connected with the corresponding through holes on the mounting plate (7) fix the corresponding to the through holes on the side beam (8), the bottom side of the workpiece (8) to be formed is parallel to the bottom side of the workpiece (2) to the through holes (1), and the device is completely assembled on the side of the side beam (8) through holes parallel to the side of the machine, the combination of the mould (6) and the workpiece (7) to be formed is integrally put into an autoclave.
2. A large thin-walled component creep age forming device according to claim 1, characterized in that a pad is arranged between the vacuum bag and all the directional wheels (2) such that the vacuum bag is not in contact with all the directional wheels, said pad being airfelt wrapped silica gel.
3. The creep age forming device for large thin-wall components according to claim 2, wherein the screw (5) has three rows, one screw, three screws and one screw are sequentially arranged in the three rows, and five screws are arranged in a "+" shape.
4. A large thin-walled component creep age forming device according to claim 3 wherein the thickness of the silicone is 3mm.
5. The creep aging forming method for the large thin-wall member is characterized by comprising the following steps of:
step 1, cutting isosceles trapezoid plates for creep aging forming by using plates meeting requirements, taking the isosceles trapezoid plates as a workpiece (8) to be formed, placing the workpiece (8) to be formed wrapped in an airfelt on a die (6), placing the long edge in the bottom edge of the workpiece (8) to be formed at one end of the die (6) provided with a mounting plate (7) matched with a side beam (1), sealing the workpiece (8) to be formed in a closed space formed by a vacuum bag and the die (6) by using high-temperature glue and the vacuum bag, and vacuumizing the vacuum bag;
step 2, after vacuumizing treatment, connecting two through holes on each side beam (1) with two corresponding through holes on the mounting plate (7) through bolts to fix a frame at one end of the die (6), wherein each screw (5) is perpendicular to the die surface when the frame is fixed at one end of the die (6);
step 3, rotating each screw rod (5), enabling the shaft of the corresponding directional wheel (2) to be parallel to a bolt connecting the through hole on the mounting plate (7) and the through hole on the side beam (1), placing a cushion block between the vacuum bag and all the directional wheels (2), then adjusting the nut (4) on each screw rod (5) to adjust the position of each screw rod (5) and fix each screw rod (5), clamping the corresponding screw rod (5) by a clamp when adjusting the nut (4) on each screw rod (5) so that the shaft of the directional wheel (2) at the lower end of the screw rod is parallel to the bolt connecting the through hole on the mounting plate (7) and the through hole on the side beam (1), and propping against the middle part of the long side in the bottom edge of the workpiece (8) to be formed by the corresponding directional wheel (2) when each screw rod (5) is fixed;
and 4, integrally placing the combination of the mechanical loading device, the die (6) and the workpiece (8) to be formed into an autoclave for vacuum creep aging forming, separating the mechanical loading device, the die (6) and the workpiece (8) to be formed after the vacuum creep aging forming is finished, and cutting off the allowance area of the workpiece (8) to be formed, thus finishing the manufacture of the large-sized thin-wall member.
6. The creep aging forming method for a large thin-walled member according to claim 5, wherein both ends of a long side among bottom sides of the work (8) to be formed are cut out by the same length to eliminate an acute angle of the work to be formed before the work (8) to be formed is wrapped in airfelt.
7. The creep aging forming method of a large thin-walled member according to claim 6, wherein the upper bottom of the workpiece (8) to be formed is 610mm, the lower bottom is 2100mm, the height is 2650mm, the thickness of the workpiece (8) to be formed is 3-6 mm, and both ends of the lower bottom of the workpiece (8) to be formed are cut 50mm to eliminate an acute angle of the workpiece (8) to be formed.
8. The method of creep aging of a large thin-walled member according to claim 7, wherein the satisfactory sheet is an aluminum lithium alloy sheet.
9. The method for creep aging a large thin-walled member according to claim 8, wherein the vacuum creep aging is performed with a continuous load of 1.9MPa positive pressure in the autoclave.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2023101368128 | 2023-02-20 | ||
| CN202310136812 | 2023-02-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116475302A true CN116475302A (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202310329231.6A Pending CN116475302A (en) | 2023-02-20 | 2023-03-30 | Creep aging forming device and forming method for large thin-wall member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117531911A (en) * | 2024-01-10 | 2024-02-09 | 中南大学 | Method for creep aging forming melon petal member by utilizing electric pulse |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117531911A (en) * | 2024-01-10 | 2024-02-09 | 中南大学 | Method for creep aging forming melon petal member by utilizing electric pulse |
| CN117531911B (en) * | 2024-01-10 | 2024-03-29 | 中南大学 | Method for creep aging forming melon petal member by utilizing electric pulse |
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