CN112338053B

CN112338053B - Creep aging forming device for large aluminum alloy component

Info

Publication number: CN112338053B
Application number: CN202011098674.1A
Authority: CN
Inventors: 湛利华; 杨有良; 李国鹏; 宋晓东
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-07-20
Anticipated expiration: 2040-10-14
Also published as: CN112338053A

Abstract

The invention provides a creep age forming device for a large aluminum alloy member, which comprises a loading assembly, wherein the loading assembly comprises a loading rod, a loading connecting piece, a fixing pin and a loading shaft, the loading shaft is horizontally arranged, and the bottom of the loading rod is provided with a bottom groove at least one end of the loading rod in the length direction of the loading rod is a through groove, the loading rod comprises two vertical rods and a cross rod, the loading connecting piece comprises an upper tooth space ring and a lower connecting rod, the tooth space ring comprises at least more than three grooves, each loading rod is at least matched and connected with two loading connecting pieces in the same group, the fixing pin is in a long strip shape, the upper side of the fixing pin is embedded in the bottom groove of the loading shaft, the lower side of the loading shaft is inserted in the groove of the loading connecting piece, each group of loading connecting pieces are arranged in a staggered way in the axial direction of the loading shaft, and the fixing pins and the grooves connected with each group of loading connecting pieces are different, so that the angle formed by the vertical rod of each loading rod and the horizontal plane is different. The device can prepare the aluminum alloy component product with higher precision.

Description

Creep aging forming device for large aluminum alloy component

Technical Field

The invention belongs to the technical field of creep age forming of large aluminum alloy components, and particularly relates to a creep age forming device for a large thin-wall aluminum alloy component for aerospace.

Background

Creep age forming is a novel metal plate forming technology, can simultaneously realize forming and strength improvement of components, and is widely applied to manufacturing of large-scale aerospace thin-wall components. The creep age forming process can be divided into three stages: the method mainly comprises a loading stage, a creep aging stage and an unloading stage, wherein the component bending loading method mainly comprises two methods of mechanical loading and vacuum bag loading. The mechanical loading method needs two sets of concave and convex moulds, but has the problems of long heating time, large space volume and the like, and is generally only suitable for small components in a laboratory; the vacuum bag loading method is suitable for large-size components, but the operation is complex, and the vacuum bag is easily sucked into a gap formed between the component and the mold surface, so that the vacuum bag is scratched, and the forming failure is caused. The person skilled in the art also proposes many new solutions for the mechanical loading as well as for the vacuum loading of the components.

The utility model CN208960708U discloses a method for preloading components, but the method is only manually loaded through a middle loading rod, so that the manual loading is labor-consuming, the loading capacity is limited, and the components are dangerous in the loading process, and in addition, the middle position of the loaded components has obvious plastic deformation, so that obvious marks are left on the components, and the method is not beneficial to ensuring the appearance quality of the components. Patent CN 106978578A discloses a mechanical-vacuum combined loading method, but only a mechanical loading method is mentioned, which is not described in detail and has less functions. While patents CN104561848A and ZL201810858666.9 are directed to reducing the chord height of aluminum alloy members by roll bending, making the vacuum easier to load.

The applicant of the present invention previously proposed a mechanical loading creep age forming apparatus (CN201911159303) and a creep age forming method based on mechanical loading (CN 201911157801.8). The mechanical loading creep age forming device comprises a rack, a loading device arranged on the rack and a die arranged below the loading device; the loading device comprises a plurality of groups of loading hydraulic cylinders, wherein the extension directions of piston rods of two adjacent groups of loading hydraulic cylinders are different, the extension directions of the piston rods of a plurality of loading hydraulic cylinders in the same group are the same, and the lower ends of the plurality of piston rods are connected with a compression rod together; the mold includes a mold-shaped plate and a plurality of supporting means for supporting the mold-shaped plate. The invention controls the telescopic length of the piston rods of different groups of loading hydraulic cylinders and adjusts the curvature of the molded surface of the die by adjusting the height of each supporting device, so that the forming device can form various workpieces with different curvatures; the compression bar is adopted to apply loading force to the part to be formed, so that the possibility of internal defects of the part caused by the loading process is reduced. The forming machine is simple in structure, strong in operability, high in practicability and stable in quality of formed parts. The mechanical loading-based creep age forming method uses a mechanical loading creep age forming device to mechanically load an aluminum alloy plate, and comprises the following steps: firstly, a plate to be formed is placed on a mould; secondly, firstly, applying load to the upper surface of the plate to be formed through a main hydraulic cylinder and a loading hydraulic cylinder to deform the plate to be formed until the lower surface of the plate to be formed is tightly attached to the upper surface of a mould-shaped plate, and then fixing the part to be formed and the mould profile through a cover plate; thirdly, placing the workpiece to be formed and the die into an autoclave, heating to the aging temperature and preserving heat; and fourthly, cooling to room temperature, and unloading to obtain a creep age-formed product. The invention adopts a mechanical loading mode to pressurize the aluminum alloy plate, can form various workpieces with different curvatures, and can reduce the early preparation time by about 30 percent compared with the vacuum film pasting in the prior art.

However, the inventor finds in practical research that the device and the method still have the disadvantages that need to be improved. Therefore, there is a need in the art for a new creep-age forming apparatus and method for large thin-walled aluminum alloy members for aerospace use.

Disclosure of Invention

Therefore, the invention provides a creep age forming device for a large aluminum alloy member, which comprises a support (1), a cross beam (2), a loading assembly and a die assembly, wherein the support is used for supporting the cross beam, the loading assembly is arranged on the cross beam, the loading assembly comprises more than three loading rods (3), more than three groups of loading connecting pieces (4), a fixed pin (5) and a loading shaft (6), each group of loading connecting pieces (4) comprises more than two loading connecting pieces connected to the same loading rod, the loading shaft is horizontally arranged, the bottom of the loading shaft is provided with a bottom groove (61) at least one end of the loading shaft in the length direction of the loading shaft is a through groove, the bottom groove is used for inserting the upper side of the fixed pin into the loading shaft from the horizontal direction, the loading rod comprises two vertical rods (31) and a cross rod (32) which is connected to the bottoms of the two vertical rods and is used for applying mechanical pressure to the aluminum alloy member, loading connecting piece (4) are used for connecting loading pole (3) and loading axle (6), loading connecting piece (4) include at last tooth's socket ring (41) and connecting rod (42) under, the connecting rod with montant registrates the matching and sets up, and through hydraulic control the length of stretching out of montant, tooth's socket ring is used for the cover to establish loading epaxially, including recess (411) more than three at least on the tooth's socket ring, every loading pole at least with two with organizing loading connecting piece accordant connection, fixed pin (5) are rectangular form, and its upside inlays and inserts in kerve (61) of loading axle (6), the downside of fixed pin (5) inlays and inserts in recess (411) of loading connecting piece (4), every group loading connecting piece (4) are in the axial of loading axle is staggered arrangement, just the fixed pin makes montant and the water of every loading pole (3) different with recess (411) that every group loading connecting piece (4) are connected The angles of the planes are different; the die assembly is disposed below the loading assembly and is used to support the aluminum alloy member.

In a specific mode, a lifting positioning mechanism is arranged on the cross beam (2), so that the cross beam and a loading assembly arranged on the cross beam can integrally move up and down.

In a specific mode, the number of the loading rods (3) and the number of the groups of the loading connecting pieces (4) are both 5-7.

In a specific mode, the vertical rod is a solid rod, and the connecting rod is a sleeve rod sleeved at the upper end of the vertical rod.

In a specific mode, the die assembly comprises a clamping plate (7) with a vertical plate surface and a top surface for directly supporting the aluminum alloy component, a fixing rod (8) arranged above the clamping plate and the aluminum alloy component and a bolt (9) used for connecting the fixing rod and the clamping plate.

In a specific mode, the number of the loading rods (3) is odd, and the number of the clamping plates and the number of the fixing rods are respectively one more than that of the loading rods.

The invention has at least the following beneficial effects:

1. the invention provides automatic loading equipment for a large-scale component, which only needs a female die, can realize automatic loading and film pasting of the component according to requirements, and then mechanically fix the component, thereby avoiding the problem of inaccurate forming precision caused by loosening and air leakage of a vacuum bag in the creep aging process. Meanwhile, the problems of long heating time and large space volume in the traditional mechanical method are avoided. The device cost is greatly reduced, and the device is suitable for forming large aluminum alloy components.

2. In the loading scheme, the angle between the loading rods can be adjusted according to the length size or the thickness of the aluminum alloy plate, so that the stress is more uniform, and the loading rods are tightly attached to the molded surface of the mold. Compared with the prior art, the method can prepare the aluminum alloy member product with higher precision.

Drawings

FIG. 1 is a schematic view showing the overall structure of a molding apparatus according to the present invention.

FIG. 2 is a schematic view of a part of the structure of a molding apparatus according to embodiment 1 of the present invention.

FIG. 3 is a schematic view of a part of the structure of a molding apparatus according to embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of a loading connector in the forming apparatus according to embodiment 1 of the present invention.

FIG. 5 is a schematic view of a part of the structure of the forming apparatus according to the present invention.

FIG. 6 is a schematic structural view of an aluminum alloy member loaded by the forming apparatus of the present invention.

FIG. 7 is a schematic view of the mechanical fastening of an aluminum alloy member after bending by the forming apparatus of the present invention.

FIG. 8 is a schematic view showing the entire structure of a molding apparatus according to embodiment 2.

Fig. 9 is an enlarged view of a part of the molding apparatus of example 2, i.e., an enlarged view at a in fig. 8.

Fig. 10 is a schematic structural diagram of the loading assembly in embodiment 2, which uses worm and gear matching.

In the figure: 1. the device comprises a support, 2 parts of a cross beam, 3 parts of a loading rod, 31 parts of a vertical rod, 32 parts of a cross rod, 4 parts of a loading connecting piece, 41 parts of a tooth groove ring, 411 parts of a groove, 42 parts of a connecting rod, 43 parts of a turbine ring, 431 parts of a turbine tooth, 5 parts of a fixing pin, 6 parts of a loading shaft, 61 parts of a bottom groove, 7 parts of a clamping plate, 8 parts of a fixing rod, 9 parts of a bolt, 10 parts of a stepping motor, 11 parts of a worm and 01 parts of an aluminum alloy plate.

Detailed Description

Example 1

The invention provides a creep age forming device for a large aluminum alloy member, which comprises a support (1), a cross beam (2), a loading assembly and a die assembly, wherein the support is used for supporting the cross beam, the loading assembly is arranged on the cross beam, the loading assembly comprises more than three loading rods (3), more than three groups of loading connecting pieces (4), a fixing pin (5) and a loading shaft (6), each group of loading connecting pieces (4) comprises more than two loading connecting pieces connected to the same loading rod, the loading shaft is horizontally arranged, the bottom of the loading shaft is provided with a bottom groove (61) at least one end of the loading shaft in the length direction of the loading shaft is a through groove, the bottom groove is used for inserting the upper side of the fixing pin into the loading shaft from the horizontal direction, the loading rod comprises two vertical rods (31) and a cross rod (32) connected to the bottoms of the two vertical rods and used for applying mechanical pressure to the aluminum alloy member, loading connecting piece (4) are used for connecting loading pole (3) and loading axle (6), loading connecting piece (4) include at last tooth's socket ring (41) and connecting rod (42) under, the connecting rod with montant registrates the matching and sets up, and through hydraulic control the length of stretching out of montant, tooth's socket ring is used for the cover to establish loading epaxially, including recess (411) more than three at least on the tooth's socket ring, every loading pole at least with two with organizing loading connecting piece accordant connection, fixed pin (5) are rectangular form, and its upside inlays and inserts in kerve (61) of loading axle (6), the downside of fixed pin (5) inlays and inserts in recess (411) of loading connecting piece (4), every group loading connecting piece (4) are in the axial of loading axle is staggered arrangement, just the fixed pin makes montant and the water of every loading pole (3) different with recess (411) that every group loading connecting piece (4) are connected The angles of the planes are different; the die assembly is disposed below the loading assembly and is used to support the aluminum alloy member.

The clamping plate 7 in the die assembly can move up and down, so die profiles with different curvatures can be formed in the length direction, an aluminum alloy plate blank is placed on the die profiles, the cross beam 2 is controlled to move down firstly, when the loading rod 3 at the middle position contacts the plate aluminum alloy blank, the cross beam 2 is stopped to move down, then the loading rod 3 is controlled to extend out gradually, pressure is applied to the aluminum alloy component, the component is bent until all positions of the aluminum alloy component contact the top of the clamping plate 7, the loaded component is as shown in figure 6, and finally the fixing rod 8 and the clamping plate 7 are connected through the bolt 9, so that the aluminum alloy component is completely fixed on the die assembly, the cross beam moves up, and then the whole die containing the aluminum alloy component can enter the autoclave to perform creep age forming.

The device avoids the use of the traditional male die for loading, can realize the loading of the complex curvature component by adjusting the die clamping plate, the cross beam and the loading rod, and has good universality on aluminum alloy components in different shapes. Meanwhile, the fixing method of the component is simple and firm, and the problems of air leakage, breakage and the like of the vacuum bag at high temperature and high pressure are avoided, so that the method not only can greatly shorten the manual operation time and reduce the production cost, but also can improve the forming precision of the component.

Example 2

The utility model provides a mechanical loading aluminum alloy member creep age forming device, the device includes support (1), crossbeam (2), loading subassembly and mould subassembly, the support is used for supporting the crossbeam, be provided with on the crossbeam the loading subassembly, the loading subassembly includes more than three loading pole (3), more than three load connecting piece (4), more than three worm (11) and the loading axle (6) of group, every load connecting piece (4) of group contains the load connecting piece more than two of connection on same loading pole, every worm (11) of group contains the worm more than two with the same load connecting piece accordant connection of group, the loading axle level sets up, the loading pole includes two montants (31) and connects the bottom of two montants and be used for applying mechanical pressure's horizontal pole (32) to the aluminum alloy member, load connecting piece (4) are used for connecting loading pole (3) and loading axle (6), the loading connecting piece (4) comprises an upper turbine ring (43) and a lower connecting rod (42), the connecting rods are sleeved with the vertical rods and are matched with the vertical rods, the extending length of the vertical rods is controlled through hydraulic pressure, the turbine ring is sleeved on the loading shaft, each loading rod is at least matched and connected with two loading connecting pieces in the same group, each group of loading connecting pieces (4) are arranged in a staggered mode in the axial direction of the loading shaft, and the worm is matched with turbine teeth (431) at the top of the turbine ring to adjust so that the vertical rods of each loading rod (3) and the horizontal plane form different angles; the die assembly is disposed below the loading assembly and is used to support the aluminum alloy member.

The unfolding angle of the loading assembly can be automatically adjusted and controlled according to the length of the member, namely, the angle formed by the vertical rod of each loading rod and the horizontal plane can be adjusted in real time, and the overall schematic diagram of the device is shown in fig. 8. In the scheme, a circular ring of the loading connecting piece sleeved on the loading shaft is set to be in a worm wheel ring form, a worm 11 is inserted into a cross beam, so that the worm is meshed with the worm wheel, and the back and forth movement of the worm is controlled by a stepping motor 10. Therefore, the worm can be controlled to move through the stepping motor so as to drive the turbine ring of the loading connecting piece to rotate, when the expansion spiral angle of the worm is smaller than the friction angle of contact of the turbine and the worm, the worm and the worm can be subjected to self-locking, namely, the worm is stressed on the turbine and tends to rotate, but the worm cannot move due to the self-locking effect, so that the effect of fixing the loading assembly is achieved. Compared with the embodiment 1, the scheme is more convenient for adjusting the unfolding angle of the loading rod.

The applicant of the present invention previously proposed a mechanical loading creep age forming apparatus (CN201911159303) and a creep age forming method based on mechanical loading (CN 201911157801.8). The loading hydraulic cylinder is fixed on the side wall of the inner cavity of the skirt-shaped support, so that the telescopic direction of a piston rod of the loading hydraulic cylinder is fixed. In addition, the loading rod and the aluminum alloy plate are easy to incline and slip by the scheme, and the system is not stable enough.

In the loading schemes of the embodiment 1 and the embodiment 2 of the invention, the angle between the loading rods can be adjusted according to the length size or the thickness of the aluminum alloy plate, so that the stress is more uniform and the loading rods are tightly attached to the molded surface of the mold.

In the loading assembly in embodiment 1 of the present invention, the fixing pin 5 is connected with the fixing shaft 6 and the tooth groove ring in a matching manner, and the fixing pin 5 is different from the groove 411 of each group of loading connecting members in a matching manner, so that the loading rod can be in 5 different expansion angles, and the aluminum alloy plates with different sizes can be satisfied in the present invention.

In the embodiment 2 of the invention, the worm 11 is matched with the turbine ring 43 of the loading connecting piece 4, so that the plane where the loading rod is located and the loading shaft 6 form any angle, and the application range of the loading rod to aluminum alloy plates with different sizes and thicknesses is wider; in addition, the angle of the stepping motor 10 can be accurately adjusted in the loading process, so that the vertical rod 31 of the loading rod 3 is perpendicular to the stress of the molded surface of the aluminum alloy plate, and the system is more stable.

In addition, in the schemes of the embodiment 1 and the embodiment 2 of the invention, the aluminum alloy plates are self-symmetrical in the length direction, the plane where one loading rod in the middle position is located is always in the vertical direction, and the number and the positions of the clamping plates in the die assembly are set, so that the loading rod in the middle position is just avoided, and the interference is avoided.

In the invention, the more the number of the loading rods 3 and the groups of the loading connecting pieces 4 are, the more precise and accurate the device is. However, the tooth groove ring 41 or the turbine ring 43 of the loading connecting piece 4 is sleeved on the loading shaft 6 in a staggered manner, and the occupied space needs to be considered, so that the number of groups cannot be too large. In addition, in embodiment 1, the larger the number of sets of load connection members 4, the larger the number of grooves 411 per one of the rack rings 41, which is also an element for limiting the number of sets of load connection members 4. Therefore, the number of the loading levers 3 and the number of the groups of the loading links 4 are generally set to three to ten groups.

In the figures of the invention, the cross rod 32 is a straight rod and is suitable for aluminum alloy plates bent in a one-way mode, and the cross rod can also be set as a bent rod so as to be suitable for aluminum alloy plates bent in a two-way mode.

The above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Any other changes or modifications of the equivalent technical features without changing the basic idea and essence of the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A creep age forming device for large aluminum alloy members comprises a support (1), a cross beam (2), a loading assembly and a die assembly, wherein the support is used for supporting the cross beam, the loading assembly is arranged on the cross beam and comprises more than three loading rods (3), more than three groups of loading connecting pieces (4), fixing pins (5) and loading shafts (6), each group of loading connecting pieces (4) comprises more than two loading connecting pieces connected to the same loading rod, the loading shafts are horizontally arranged, the bottoms of the loading shafts are provided with bottom grooves (61) which are at least through grooves at one ends in the length direction of the loading shafts, the bottom grooves are used for inserting the upper sides of the fixing pins into the loading shafts from the horizontal direction, each loading rod comprises two vertical rods (31) and a cross rod (32) which is connected to the bottoms of the two vertical rods and is used for applying mechanical pressure to the aluminum alloy members, loading connecting piece (4) are used for connecting loading pole (3) and loading axle (6), loading connecting piece (4) include at last tooth's socket ring (41) and connecting rod (42) under, the connecting rod with montant registrates the matching and sets up, and through hydraulic control the length of stretching out of montant, tooth's socket ring is used for the cover to establish loading epaxially, including recess (411) more than three at least on the tooth's socket ring, every loading pole at least with two with organizing loading connecting piece accordant connection, fixed pin (5) are rectangular form, and its upside inlays and inserts in kerve (61) of loading axle (6), the downside of fixed pin (5) inlays and inserts in recess (411) of loading connecting piece (4), every group loading connecting piece (4) are in the axial of loading axle is staggered arrangement, just the fixed pin makes montant and the water of every loading pole (3) different with recess (411) that every group loading connecting piece (4) are connected The angles of the planes are different; the die assembly is disposed below the loading assembly and is used to support the aluminum alloy member.

2. The device according to claim 1, characterized in that a lifting positioning mechanism is arranged on the cross beam (2) so that the cross beam and a loading assembly arranged on the cross beam can integrally move up and down.

3. The device according to claim 1, characterized in that the number of the loading rods (3) and the number of the groups of the loading connectors (4) are both 5-7.

4. The device of claim 1, wherein the vertical rod is a solid rod, and the connecting rod is a sleeve rod sleeved on the upper end of the vertical rod.

5. An apparatus according to claim 1, characterized in that the mould assembly comprises a pallet (7) with vertical faces and a top surface for directly supporting the aluminium alloy member, fastening bars (8) for arranging above the pallet and the aluminium alloy member, and bolts (9) for connecting the fastening bars and the pallet.

6. The device according to claim 5, characterized in that the number of loading rods (3) is odd and the number of clamping plates and fixing rods is one more than the number of loading rods.