CN112318067A - Die device for creep aging forming of large complex curvature component and design method - Google Patents
Die device for creep aging forming of large complex curvature component and design method Download PDFInfo
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Abstract
The invention specifically provides a die device for creep aging forming of a large complex curvature component and a design method, wherein the method comprises the following steps: step S1: designing a profile of a variable-thickness die; step S2: designing a mold surface supporting base, and arranging the variable-thickness mold surface on the mold surface supporting base; step S3: designing a component positioning assembly: determining a positioning position on the designed variable thickness die profile and forming a threaded hole, forming a waist-shaped through hole matched with the threaded hole on the component, and inserting a positioning stud into the waist-shaped through hole and connecting the positioning stud with the threaded hole; step S4: and cutting and removing the part with the kidney-shaped through hole after autoclave molding is adopted, thereby obtaining the complex curvature component with target curvature and size. The molded surface of the processed die has the characteristic of variable thickness, and the positioning assembly is favorable for preventing the aluminum alloy component from deviating due to uneven stress in the loading process, so that the precise forming of the complex curvature component is realized.
Description
Technical Field
The invention belongs to the technical field of creep age forming manufacturing of aluminum alloy, and particularly relates to a die device for creep age forming of a large complex curvature component and a design method.
Background
The creep age forming technology is an advanced metal plate forming technology which utilizes the creep deformation and the age strengthening effect of aluminum alloy and simultaneously obtains components with high precision shapes and high performance, and is widely applied to the aerospace field such as airplane wings, cabins, rocket fuel storage tanks and the like. Compared with the traditional shot blasting and roll bending forming process, the creep age forming technology has the advantages of low residual stress of formed components, short production period, low cost and the like, and is an ideal technology for accurately forming large-scale complex wall plates. On the one hand, for large-scale aluminum alloy components with complex variable curvature and high forming stress, the curvature change at different positions is large, and the precise forming of the complex variable curvature components is difficult.
To achieve accurate formation of the component, springback compensation is required in the design of the die profile to determine the final design die profile. For the manufacture of a small mold profile with a simple or complex curvature, a milling process is usually adopted to process a design profile after springback compensation on a solid blank, and for the manufacture of a large-scale complex curvature profile, the method causes serious material waste due to the overlarge chord height and has higher cost.
In addition, the curvature of the contour curve of the supporting area of the rib plate of the die base in the prior art is also continuously changed, so that the manufacturing difficulty and the manufacturing cost of the rib plate are increased. Therefore, there is a need in the art for a method for designing and manufacturing a mold surface of a mold, which is suitable for a large-scale variable-curvature complex component, and which can reduce material waste and has a low manufacturing cost. On the other hand, when a complex curvature member is manufactured by the creep age forming technology, the member can generate larger deviation in the air pressure loading process due to larger curvature difference of different positions of the mold surface, even the member moves out of the mold surface and cannot be completely attached to a forming target area, so that the member needs to be accurately positioned in the loading forming process, the member is attached to the mold in the forming area, and the required precision requirement of the member is met.
Disclosure of Invention
The invention provides a die device for creep age forming of a large complex curvature member and a design method thereof, aiming at the creep age forming of the large complex curvature member.
The technical scheme adopted by the invention is as follows:
a method for designing a die for creep age forming of a large-scale complex curvature component is characterized by comprising the following steps:
step S1: designing a profile of a variable-thickness die;
step S2: designing a mold surface supporting base, and arranging the variable-thickness mold surface on the mold surface supporting base;
step S3: designing a component positioning assembly: determining a positioning position on the designed variable thickness die profile and forming a threaded hole, forming a waist-shaped through hole matched with the threaded hole on the component, and inserting a positioning stud into the waist-shaped through hole and connecting the positioning stud with the threaded hole;
step S4: and cutting and removing the part with the kidney-shaped through hole after autoclave molding is adopted, thereby obtaining the complex curvature component with target curvature and size.
Preferably, in step S1, the step of designing the variable thickness mold profile includes:
(1) drawing a large-scale complex curvature target profile by using three-dimensional software, establishing a plane D by using any three points of four vertexes of the target profile, and establishing a plane C perpendicular to the plane D by using a small-end arc midpoint A and a large-end arc midpoint B;
(2) projecting the target profile S on a plane C0Obtaining a projected target profile S0Using three-dimensional software to determine the envelope target profile S0Two parallel stationary curves of the projected contourRadius of curvature RjThe contour line of (1);
(3) on the basis of component raw materials and a creep aging finite element geometric model, a target profile is taken as an initial mould profile B0Carrying out creep aging springback compensation simulation by using finite element simulation software and a geometric reconstruction model to obtain the maximum springback value delta of the node and the design profile B after springback compensationi；
(4) From the maximum springback value δ obtained, the springback formula δ ═ R (R) was usedj-Ri)/RiWherein R isjRepresenting the fixed curvature radius of the enveloping theoretical molded surface, and determining the fixed curvature radius R of the compensated molded surface of the moldiDetermining the initial thickness of the plate by the maximum deflection point N on the profile of the compensated mould and the maximum deflection point M on the upper profile of the enveloping target profile;
(5) reserving a certain die trimming allowance t, and determining the final plate thickness by adding the initial plate thickness and the die trimming allowance t;
(6) rolling and bending the plate with determined final thickness into a compensated mould profile curvature radius Ri；
(7) Milling the side of the concave surface of the rolled plate to form a designed profile BiObtaining a concave surface as a design profile BiConvex surface with a constant radius RiThe variable thickness mold profile of (2);
(8) with BiCarrying out creep age forming test on the die profile to obtain a forming profile Si；
(9) Calculating S0And SiForming error Delta S;
(10) if Δ S < ε is satisfied, then use SiCorresponding mold surface BiAs the final designed mold profile; if not, then according to S0And SiBy an error value, forming a profile S for the componentiCorresponding mold surface BiDetermining the mold surface B by springback compensationi+1And (5) repeating the steps (4) to (7).
Preferably, a target forming area line matched with the formed aluminum alloy component is arranged at the concave surface of the molded surface of the die.
Preferably, the threaded holes are distributed on the outer area of the target forming area line, and the depth of the threaded holes is smaller than the thickness of the molded surface of the mold.
The utility model provides a die set of large-scale complicated camber component of creep age forming, the device includes that mould profile supports the base, becomes thickness mould profile and locating component, become thickness mould profile and set up on mould profile supports the base to be fixed in on the variable thickness mould profile through locating component with the component.
Preferably, the mold profile supporting base is of a uncovered box structure formed by hermetically connecting a bottom plate, a front side plate, a rear side plate, a left side plate and a right side plate, a plurality of transverse stiffened plates and longitudinal stiffened plates are arranged in an inner cavity of the uncovered box structure and are distributed in a staggered mode, a plurality of square units are formed on the horizontal section of the uncovered box structure, the tops of the front side plate, the rear side plate and the transverse stiffened plates are of curved structures, and the curvature profiles of the front side plate, the rear side plate and the transverse stiffened plates are firmly contacted with the variable thickness mold profile.
Preferably, a plurality of rows of longitudinal strip-shaped holes are formed in the front side plate, the rear side plate and the plurality of transverse reinforcing plates, each row of longitudinal strip-shaped holes is located on a longitudinal central line of the corresponding row of the plurality of grid units, and the height of each longitudinal strip-shaped hole is smaller than that of each transverse reinforcing plate; and the left side plate, the right side plate and the plurality of longitudinal reinforcing ribs are all provided with a plurality of rows of transverse strip-shaped holes, each row of transverse strip-shaped holes are positioned on the transverse central lines of the plurality of grid units of the corresponding row, and the height of each transverse strip-shaped hole is smaller than that of the longitudinal reinforcing plate.
Preferably, circular grooves which are arranged at equal intervals are formed in the top curve outline of the front side plate, the top curve outline of the rear side plate and the top curve outline of the transverse stiffened plate, circular grooves which are arranged at equal intervals are also formed in the top of the left side plate and the top of the right side plate, the radius of each circular groove is 20-30mm, and the grooves are beneficial for uniformly heating the profile of the variable-thickness die and the member.
Preferably, a target forming area line matched with the formed aluminum alloy component is arranged at the concave surface of the molded surface of the die.
Preferably, locating component includes positioning bolt and waist shape through-hole, waist shape through-hole setting is in member length direction's both sides and symmetric distribution, positioning bolt passes waist shape through-hole and fixes the threaded hole on the thickness-variable mould profile, the threaded hole distributes on the outer region of target forming region line, just the threaded hole degree of depth is less than mould profile thickness.
Compared with the prior art, the invention has the beneficial effects that: the die profile designed by the invention has the characteristic of variable thickness, the die supporting base structure is simplified because the convex surface of the die profile has a fixed curvature radius, the waste of materials is greatly reduced, the overall weight of the die is reduced, the die manufacturing period is shortened, and the designed profile can be conveniently refined on a thick plate subjected to roll bending. Meanwhile, the invention is beneficial to preventing the aluminum alloy member from deviating in the loading process and realizing the accurate forming of the complex curvature member. Secondly, when forming different variable curvature components, the mould base can be reused only by remachining the compensated mould design molded surface, thereby greatly reducing the manufacturing cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a projection plane;
FIG. 2 is a schematic diagram of a method for determining the thickness of an aluminum alloy sheet;
FIG. 3 is a schematic view of a variable thickness and curvature mold profile; (a) a front view; (b) a perspective view;
FIG. 4 is a schematic view of a large complex curvature creep age forming die set;
FIG. 5 is a schematic view of a kidney-shaped via hole in an aluminum alloy member;
FIG. 6 is an enlarged view taken at A in FIG. 5;
FIG. 7 is a longitudinal sectional view of the anti-shifting positioning structure in the overall device diagram;
FIG. 8 is a schematic view of a forming area and a die base rib plate; (a) a top view; (b) a front view; (c) a left view; (d) a perspective view;
FIG. 9 is a schematic view of a creep-age forming fully-overmolded target forming zone of an aluminum alloy member;
FIG. 10 is a flow chart of a variable curvature mold profile design.
Wherein, the 1-aluminum alloy member; 101-a kidney-shaped through hole; 2-variable thickness mould surface; 201-target forming area line; 3-a mold support base; 300-left side plate; 301-right side plate; 302-front side panel; 303-rear side plate; 304-transverse stiffened plate; 305-longitudinal stiffened plate; 306-longitudinal strip-shaped holes; 307-transverse strip-shaped holes; 308-a circular groove; 4-positioning the bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention particularly provides a method for designing a die for creep age forming of a large-scale complex curvature component; the complex curvature means that the curvatures in a plurality of directions are different, for example, in two directions X and Y perpendicular to each other, the member has different curvatures, and the curvature in each direction is changed with the position, and specifically, the aluminum alloy member is a part of an ellipsoid.
The specific process is as follows:
step S1: designing a variable-thickness mold surface 2;
step S2: designing a mold surface supporting base 3, and arranging a variable-thickness mold surface 2 on the mold surface supporting base 1;
step S3: designing a positioning assembly of the aluminum alloy member 1: determining a positioning position on the designed variable thickness die profile 2 and forming a threaded hole, forming a waist-shaped through hole 101 matched with the threaded hole on the aluminum alloy member 1, and inserting the positioning stud 4 into the waist-shaped through hole 101 and connecting the positioning stud with the threaded hole;
step S4: and cutting and removing the part with the kidney-shaped through hole 101 after the autoclave is formed, thereby obtaining the complex curvature component with the target curvature and size.
In step S1, the process of designing the variable thickness mold surface (as shown in fig. 10) specifically includes:
(1) drawing a large-scale complex curvature target profile by using three-dimensional software Pro/E or solidworks, establishing a plane D by using any three points in four vertexes of the target profile, and establishing a plane C perpendicular to the plane D by using a small end arc midpoint A and a large end arc midpoint B, as shown in FIG. 1;
(2) projecting the target profile S on a plane C0Obtaining a projected target profile S0Using three-dimensional software to determine the envelope target profile S0Two parallel fixed radii of curvature R of the projected contourjThe contour line of (1);
(3) on the basis of component raw materials and a creep aging finite element geometric model, a target profile is taken as an initial mould profile B0Using finite element simulation software ABAQUS or MARC and a geometric reconstruction model to perform creep aging springback compensation simulation to obtain the maximum springback value delta of the node and the design profile B after springback compensationi；
(4) According to the maximum rebound quantity delta, using the rebound formula delta as Ri/(Ri-Rj) Wherein R isjRepresenting the fixed curvature radius of the enveloping theoretical molded surface, and determining the fixed curvature radius R of the compensated molded surface of the moldiFrom the point of maximum deflection N on the profile of the mould profile after compensation and the upper profile enveloping the target profileDetermining the initial thickness of the plate material at the maximum deflection point M, as shown in figure 2;
(5) reserving a certain die trimming allowance t, and determining the final plate thickness by adding the initial plate thickness and the die trimming allowance t;
(6) rolling and bending the plate with determined final thickness into a compensated mould profile curvature radius Ri；
(7) Milling the side of the concave surface of the rolled plate to form a designed profile BiObtaining a concave surface as a design profile BiConvex surface with a constant radius RiAs shown in fig. 3(a) and 3 (b);
(8) with BiCarrying out creep age forming test on the die profile to obtain a forming profile Si；
(9) Calculating S0And SiForming error Delta S;
(10) if Δ S < ε is satisfied, then use SiCorresponding mold surface BiAs the final designed mold profile; if not, then according to S0And SiBy an error value, forming a profile S for the componentiCorresponding mold surface BiDetermining the mold surface B by springback compensationi+1And (5) repeating the steps (4) to (7).
In the embodiment, the thickness of the designed variable thickness mold surface 1 is 80-100mm, the convex curvature radius of the mold surface is 1184mm, and the concave surface is the designed curvature surface.
The variable-thickness die profile is made of Q235 or Q345, and the positioning stud is made of 45# steel (with modulated hardness HRC55-60) or die high-chromium steel.
The invention also provides a die device for creep aging forming of large complex curvature components, which comprises a die profile supporting base 3, a variable thickness die profile 2 and a positioning assembly, wherein the variable thickness die profile 2 is arranged on the die profile supporting base 3, and the aluminum alloy component 1 is fixed on the variable thickness die profile 2 through the positioning assembly.
As shown in fig. 9, a target forming area line 201 matching the formed aluminum alloy member 1 is provided at the concave surface of the variable thickness die surface 2. The target forming area line 201 is used for adjusting and determining the position of the aluminum alloy plate 1 before and during forming. The threaded holes are distributed on the outer area of the target forming area line 201, and the depth of the threaded holes is smaller than the thickness of the mold surface 2.
In order to finally form the aluminum alloy member 1 in the target forming area 201, two kidney-shaped through holes 101 are formed in one side of the aluminum alloy member 1, the aluminum alloy member 1 is fixed on the profile 2 of the variable-thickness die through positioning bolts 4, the short arc end of the member 1 is fixed and does not deviate in the creep aging loading stage, and the large arc end moves towards the middle under the action of pressure load.
First, the positioning position of the aluminum alloy member 1 is determined on the mold surface 2, on the principle that the determined positioning position must be outside the target forming region 201, and the aluminum alloy member 1 can be cut out of the region outside the target mold surface (including the kidney-shaped through-hole 101) after creep age forming. Secondly, the die profile 2 is provided with an internal thread hole, so that the internal thread hole is matched with the designed positioning stud 4 through external threads to fix the plate to be deviated, as shown in fig. 7.
The mechanical property (yield strength) of the material of the positioning stud 4 is greater than the yield strength of the material of the mold surface 2, for example, when the yield strength of the material of the positioning stud 4 is less than or equal to the yield strength of the material of the mold surface 2, the stud is deformed to lose the positioning function, and meanwhile, the loaded component cannot be attached to a target forming area.
In this embodiment, the diameter of the positioning stud 4 is 20-50mm, the height thereof is 100-200mm, and the top of the positioning stud 4 is hexagonal, so that the positioning stud can be conveniently detached by using a wrench.
As shown in fig. 5 and 6, in order to finally form 201 the aluminum alloy member 1 in the target area, two waist-shaped through holes 101 with the same size are arranged at corresponding positions on one side of the aluminum alloy member 1 to be matched with the positioning bolts 4, the waist-shaped through holes 101 are arranged on one side with smaller curvature and smaller width, the two waist-shaped through holes 101 are respectively arranged at two sides of the member 1 in the length direction, two ends of each waist-shaped through hole 101 are arc sections with the diameter of 30mm, and the distance from the center of each arc section to the end of the aluminum alloy member 1 is 50-70 mm. The circle center of the waist-shaped through hole 101 cannot be too close to the end part, otherwise, the component is easy to be damaged by pulling in the creep aging process, and the circle center cannot be too far away, otherwise, raw materials are wasted.
As shown in fig. 8(a) and (d), the mold profile supporting base is a uncovered box structure formed by hermetically connecting a bottom plate, a front side plate 302, a rear side plate 302, a left side plate 300 and a right side plate 301, a plurality of transverse reinforcing plates 304 and longitudinal reinforcing plates 305 are arranged in an inner cavity of the uncovered box structure, the plurality of transverse reinforcing plates 304 and the longitudinal reinforcing plates 305 are distributed in a staggered manner, a horizontal section of the uncovered box structure forms a plurality of square grid units, the tops of the front side plate 302, the rear side plate 303 and the transverse reinforcing plates 304 are of curved structures, and the curvature profiles of the curved structures are firmly contacted with the variable-thickness mold profile 2.
Specifically, as shown in fig. 8(b) and 8(c), a plurality of rows of longitudinal bar-shaped holes 306 are formed in the front side plate 302, the rear side plate 303 and the plurality of transverse rib plates 304, each row of longitudinal bar-shaped holes 306 is located on the longitudinal central line of the corresponding row of the plurality of grid units, and the height of each longitudinal bar-shaped hole 306 is smaller than the height of each transverse rib plate 304; the left side plate 300, the right side plate 301 and the plurality of longitudinal reinforcing ribs 305 are all provided with a plurality of rows of transverse strip-shaped holes 307, each row of transverse strip-shaped holes 307 are located on transverse central lines of a plurality of grid units in a corresponding row, and the height of each transverse strip-shaped hole 307 is smaller than that of each longitudinal reinforcing rib plate 305. The height of the longitudinal reinforcing rib 305 is lower than that of the transverse reinforcing rib plate 304. The weight of the mold supporting base 3 is reduced, the mold rigidity is increased, and the firm contact between the curvature profile of the rib plate and the convex surface of the mold surface 2 is ensured.
As shown in fig. 8(d), circular grooves 308 are formed in the top curve profiles of the front side plate 302, the rear side plate 303 and the transverse stiffened plate 304, the circular grooves 308 are arranged at equal intervals, and the radius of each circular groove 308 is 20-30mm, so that the flow of heat flow in the creep aging process is facilitated, and the components are uniformly heated.
The invention not only simplifies the design and manufacture of the mold supporting base because the convex surface of the mold surface has a fixed curvature radius, but also greatly reduces the waste of materials, reduces the whole weight of the mold, shortens the mold manufacturing period and facilitates the subsequent fine trimming of the design surface on the thick plate after the roll bending. Meanwhile, the invention is beneficial to preventing the aluminum alloy member from deviating in the loading process and realizing the accurate forming of the complex curvature member.
Claims (10)
1. A method for designing a die for creep age forming of a large-scale complex curvature component is characterized by comprising the following steps:
step S1: designing a profile of a variable-thickness die;
step S2: designing a mold surface supporting base, and arranging the variable-thickness mold surface on the mold surface supporting base;
step S3: designing a component positioning assembly: determining a positioning position on the designed variable thickness die profile and forming a threaded hole, forming a waist-shaped through hole matched with the threaded hole on the component, and inserting a positioning stud into the waist-shaped through hole and connecting the positioning stud with the threaded hole;
step S4: and cutting and removing the part with the kidney-shaped through hole after autoclave molding is adopted, thereby obtaining the complex curvature component with target curvature and size.
2. The method of claim 1, wherein the step of designing the thickened die surface in step S1 comprises:
(1) drawing a large-scale complex curvature target profile by using three-dimensional software, establishing a plane D by using any three points in four vertexes of the target profile, and establishing a plane C perpendicular to the plane D by using a small-end arc midpoint A and a large-end arc midpoint B;
(2) projecting the target profile S on a plane C0Obtaining a projected target profile S0Using three-dimensional software to determine the envelope target profile S0Two parallel fixed radii of curvature R of the projected contouriThe contour line of (1);
(3) on the basis of component raw materials and a creep aging finite element geometric model, a target profile is taken as an initial mould profile B0Carrying out creep aging springback compensation simulation by using finite element simulation software and a geometric reconstruction model to obtain the maximum springback value delta of the node and the design profile B after springback compensationi；
(4) From the maximum springback value δ obtained, the springback formula δ ═ R (R) was usedj-Ri)/RiWherein R isjRepresenting the fixed curvature radius of the enveloping theoretical molded surface, and determining the fixed curvature radius R of the compensated molded surface of the moldiDetermining the initial thickness of the plate by the maximum deflection point N on the profile of the compensated mould and the maximum deflection point M on the upper profile of the enveloping target profile;
(5) reserving a certain die trimming allowance t, and determining the final plate thickness by adding the initial plate thickness and the die trimming allowance t;
(6) rolling and bending the plate with determined final thickness into a compensated mould profile curvature radius Ri；
(7) Milling the side of the concave surface of the rolled plate to form a designed profile BiObtaining a concave surface as a design profile BiConvex surface with a constant radius RiThe variable thickness mold profile of (2);
(8) with BiCarrying out creep age forming test on the die profile to obtain a forming profile Si；
(9) Calculating S0And SiForming error Delta S;
(10) if Δ S < ε is satisfied, then use SiCorresponding mold surface BiAs the final designed mold profile; if not, then according to S0And SiBy an error value, forming a profile S for the componentiCorresponding mold surface BiDetermining the mold surface B by springback compensationi+1And (5) repeating the steps (4) to (7).
3. The method of claim 2, wherein the concave surface of the mold surface is provided with a target forming area line matched with the formed aluminum alloy component.
4. The method of claim 3, wherein the threaded holes are distributed on the outer area of the target forming area line, and the depth of the threaded holes is smaller than the thickness of the mold surface.
5. The mold device designed according to the mold design method for creep-aging forming of large complex curvature components according to any one of claims 1 to 4, wherein the device comprises a mold surface supporting base, a variable thickness mold surface and a positioning component, the variable thickness mold surface is arranged on the mold supporting base, and the components are fixed on the variable thickness mold surface through the positioning component.
6. The mold device for creep age forming of large complex curvature members according to claim 5, wherein the mold profile supporting base is of a uncovered box structure formed by hermetically connecting a bottom plate, a front side plate, a rear side plate, a left side plate and a right side plate, a plurality of transverse stiffened plates and longitudinal stiffened plates are arranged in an inner cavity of the uncovered box structure, the plurality of transverse stiffened plates and the longitudinal stiffened plates are distributed in a staggered manner, a plurality of grid units are formed on the horizontal section of the transverse stiffened plates, the tops of the front side plate, the rear side plate and the transverse stiffened plates are of curved structures, and the curvature profile of the mold profile is firmly contacted with the variable-thickness mold profile.
7. The die device for creep age forming of the large-scale complex curvature member according to claim 6, wherein a plurality of rows of longitudinal strip-shaped holes are formed in the front side plate, the rear side plate and the plurality of transverse reinforcing plates, each row of longitudinal strip-shaped holes is located on a longitudinal central line of the plurality of grid units in the corresponding row, and the height of each longitudinal strip-shaped hole is smaller than that of each transverse reinforcing plate; and the left side plate, the right side plate and the plurality of longitudinal reinforcing ribs are all provided with a plurality of rows of transverse strip-shaped holes, each row of transverse strip-shaped holes are positioned on the transverse central lines of the plurality of grid units of the corresponding row, and the height of each transverse strip-shaped hole is smaller than that of the longitudinal reinforcing plate.
8. The die device for creep age forming of the large-scale complex curvature component according to claim 6, wherein the top curve profiles of the front side plate, the rear side plate and the transverse stiffened plate are provided with circular grooves arranged at equal intervals, the tops of the left side plate and the right side plate are also provided with circular grooves arranged at equal intervals, and the radius of the circular grooves is 20-30 mm.
9. The die set for creep-age forming large complex curvature members according to claim 5, wherein the concave surface of the die profile is provided with a target forming area line matched with the formed aluminum alloy member.
10. The mold device for creep age forming of large complex curvature component of claim 9, wherein the positioning assembly comprises positioning bolts and kidney-shaped through holes, the kidney-shaped through holes are arranged at two sides of the length direction of the component and are symmetrically distributed, the positioning bolts pass through the kidney-shaped through holes and are fixed in threaded holes on the variable thickness mold surface, the threaded holes are distributed on the outer area of the target forming area line, and the depth of the threaded holes is smaller than the thickness of the mold surface.
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| CN113584283A (en) * | 2021-07-29 | 2021-11-02 | 中南大学 | Design method of creep age forming die for multi-thickness component |
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| CN114178785A (en) * | 2021-11-23 | 2022-03-15 | 南昌沪航工业有限公司 | Method for processing brim-shaped curved wall plate part |
| CN114226512A (en) * | 2022-01-24 | 2022-03-25 | 中南大学 | Large-size variable-curvature aluminum alloy wall plate preloading equipment and forming method |
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