U.S. patent application number 17/456618 was filed with the patent office on 2022-05-26 for ultra-low temperature medium pressure forming method for complex curved-shaped components.
The applicant listed for this patent is Dalian University of Technology. Invention is credited to Xiaobo FAN, Shijian YUAN.
Application Number | 20220161308 17/456618 |
Document ID | / |
Family ID | 1000006182496 |
Filed Date | 2022-05-26 |
United States Patent
Application |
20220161308 |
Kind Code |
A1 |
FAN; Xiaobo ; et
al. |
May 26, 2022 |
Ultra-low temperature medium pressure forming method for complex
curved-shaped components
Abstract
Disclosed is an ultra-low temperature medium pressure forming
method for complex curved-shaped components. The method includes
steps of distributing a blank by die closing preforming and forming
the complex curved-shaped components by ultra-low temperature
medium pressurization, comprising: placing a plate on a female die
and tightly pressing the plate by a blank holder; driving a male
die to move downwards to make the plate distribute the blank in
advance in a large-area mode, thus forming a prefabricated plate
blank; filling a cavity with an ultra-low temperature medium to
make the prefabricated plate blank be gradually attached to a
molded surface of a female die cavity under the pressure action of
the ultra-low temperature medium, and thereby forming the complex
curved-shaped component; and removing the male die blank holder and
taking out the formed complex curved-shaped component.
Inventors: |
FAN; Xiaobo; (Dalian,
CN) ; YUAN; Shijian; (Dalian, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Dalian University of Technology |
Dalian |
|
CN |
|
|
Family ID: |
1000006182496 |
Appl. No.: |
17/456618 |
Filed: |
November 26, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B21D 37/16 20130101;
B21D 22/20 20130101; B21D 22/02 20130101 |
International
Class: |
B21D 22/02 20060101
B21D022/02; B21D 22/20 20060101 B21D022/20; B21D 37/16 20060101
B21D037/16 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 26, 2020 |
CN |
202011344367.7 |
Claims
1. An ultra-low temperature medium pressure forming method for
complex curved-shaped components, comprising distributing a blank
by die closing preforming and forming the complex curved-shaped
components by ultra-low temperature medium pressurization, wherein
comprises steps as follows: S1, placing a plate on a female die,
and applying a blank holding force to a blank holder to make the
blank holder press the plate tightly; S2, driving a male die to
move downwards to make the plate distribute the blank in advance in
a large-area mode under the action of the female die and the male
die, forming a prefabricated plate blank, wherein the female die
and the male die are mismatched in molded surfaces; adjusting the
blank holding force on the blank holder according to a deep-drawing
depth of the plate to guarantee that a cavity between the
prefabricated plate blank and the male die is kept in a sealed
state; wherein a sealing element is arranged at a contact position
of an upper surface of the blank holder and the male die, the blank
holder applies a unit blank holding force of less than 5 MPa in
step S1, and the blank holder applies a unit blank holding force of
more than 7 MPa after being adjusted in step S2; S3, filling the
cavity between the prefabricated plate blank and the male die with
an ultra-low temperature medium through a booster pump and a
circulation pipeline, and enabling the prefabricated plate blank to
be gradually attached to the molded surface of the female die under
the pressure action of the ultra-low temperature medium, forming
the complex curved-shaped component; and S4, recycling the
ultra-low temperature medium in the cavity, driving the male die to
move upwards, removing the blank holder, and taking out the formed
complex curved-shaped component.
2. The ultra-low temperature medium pressure forming method for
complex curved-shaped components according to claim 1, wherein the
male die is a cambered die in smooth transition, and a molded
surface with complex shape is arranged in the female die.
3. The ultra-low temperature medium pressure forming method for
complex curved-shaped components according to claim 1, wherein,
before step S1, the male die is cooled to a set temperature of
lower than -160.degree. C.
4. The ultra-low temperature medium pressure forming method for
complex curved-shaped components according to claim 1, wherein a
solution cavity for accommodating the ultra-low temperature medium
is arranged in the male die, and the solution cavity is
communicated with a low-temperature vessel and the booster pump
through a circulation path, wherein the low-temperature vessel is
used for placing the ultra-low temperature medium.
5. The ultra-low temperature medium pressure forming method for
complex curved-shaped components according to claim 4, wherein
pressurization pressure of the booster pump is no more than 100
MPa.
6. The ultra-low temperature medium pressure forming method for
complex curved-shaped components according to claim 1, wherein the
ultra-low temperature medium is liquid nitrogen, liquid argon, or
liquid helium.
7. The ultra-low temperature medium pressure forming method for
complex curved-shaped components according to claim 1, wherein the
plate is a rolled aluminum alloy plate having a wall thickness of
0.1-10 mm, and the plate is Al--Li alloy, Al--Cu alloy, Al--Mg--Si
alloy, or Al--Zn alloy.
Description
FIELD OF TECHNOLOGY
[0001] The present invention relates to the technical field of
plate forming, and in particular relates to an ultra-low
temperature medium pressure forming method for complex
curved-shaped components.
BACKGROUND
[0002] Thin-walled curved-shaped components are the key structures
of launch vehicles, aircrafts, high-speed rails, and new energy
automobiles, which directly affect the service performance of
launch equipment. Such components are not only critical, but also
large in demand, accounting for more than 50% of amount in the
aircrafts and automobiles. To meet significantly increased service
requirements of new generation of equipment, thin-walled
curved-shaped components are becoming more and more complex in
shape and more difficult to deform the material. For example, to
reduce the weight and improve the profile streamline, most of
covering parts for the new energy automobile are largely made of
high-strength aluminum alloy, and the section shape is a
special-shaped curved surface with positive and negative
curvatures. To meet the aerodynamic performance of high-speed
driving above 300 km/h, a high-speed train nose requires a covering
part with small feature ridges, which has small sharp fillets
formed in a large-size space curved surface. To meet the
requirements of high reliability and air impermeability, a novel
aircraft cabin door and a skin type component mostly adopt
special-shaped curved components made of high-strength aluminum
alloy. Such components are generally special-shaped curved surfaces
and have local small fillets or small features, and the ratio of
the fillet radius to the wall thickness of the small features is
even close to 1.0.
[0003] The thin-walled curved-shaped components are generally
formed and manufactured by adopting a deep-drawing process;
actually, a plate is plastically deformed under the action of a
male die and is continuously drawn into a gap between the male die
and a female die to form a part. The final shape of the component
is decided by pressing of the male die or matched pressing of the
male and the female die. For the component with relatively simple
curved shape, the component can be directly formed through
deep-drawing, such as a conventional automobile covering part, an
airplane door surrounding frame and the like; for the component
with a complex curved shape or large depth, complex procedures such
as multi-pass pre-forming and intermediate annealing and the like
are needed to form the component, resulting in the problems of low
yield and poor quality of finished products; for a complex
curved-shaped components with positive and negative curvatures or
local small features, due to successive contact sequence of the
plate and the forming die and the matching of the male die and the
female die, cracking is prone to occurring at a transition or local
fillet, and forming cannot be completed smoothly; more importantly,
the normal-temperature formability of the high-strength aluminum
alloy is relatively poor (the formability is less than 10%), which
is more likely to cause cracking defects and exceeds the limit of
deep-drawing forming of the high-strength aluminum alloy. At
present, the problem of forming cracking of the high-strength
aluminum alloy complex curved-shaped components still cannot be
solved.
SUMMARY OF THE INVENTION
[0004] An objective of the present invention is to provide an
ultra-low temperature medium pressure forming method for complex
curved-shaped components to solve the problem in the prior art,
thus an aluminum alloy plate deforms under an ultra-low temperature
condition, the problem of forming cracking of the complex
curved-shaped components can be avoided, and the wall thickness
uniformity and the forming efficiency are improved.
[0005] To achieve the objective, the present invention provides the
following solutions:
[0006] An ultra-low temperature medium pressure forming method for
complex curved-shaped components, comprising: distributing a blank
by die closing preforming and forming the complex curved-shaped
components by ultra-low temperature medium pressurization, includes
steps as follows:
[0007] S1, placing a plate on a female die, and applying a blank
holding force to a blank holder to make the blank holder press the
plate tightly;
[0008] S2, driving a male die to move downwards to make the plate
distribute the blank in advance in a large-area mode under the
action of the female die and the male die, forming a prefabricated
plate blank, wherein the female die and the male die are mismatched
in molded surfaces; adjusting the blank holding force on the blank
holder according to a deep-drawing depth of the plate to guarantee
that a cavity between the prefabricated plate blank and the male
die is kept in a sealed state;
[0009] S3, filling the cavity between the prefabricated plate blank
and the male die with an ultra-low temperature medium through a
booster pump and a circulation pipeline, and enabling the
prefabricated plate blank to be gradually attached to the molded
surface of the female die under the pressure action of the
ultra-low temperature medium, t forming the complex curved-shaped
component; and
[0010] S4, recycling the ultra-low temperature medium in the
cavity, driving the male die to move upwards, removing the blank
holder, and taking out the formed complex curved-shaped
component.
[0011] Preferably, the male die is a cambered die in smooth
transition, and a molded surface with a complex shape is arranged
in the female die.
[0012] Preferably, before step S1, the male die is cooled to a set
temperature of lower than -160.degree. C.
[0013] Preferably, a solution cavity for accommodating the
ultra-low temperature medium is arranged in the male die, and the
solution cavity is communicated with a low-temperature vessel and
the booster pump through a circulation path, wherein the
low-temperature vessel is used for placing the ultra-low
temperature medium.
[0014] Preferably, pressurization pressure of the booster pump is
no more than 100 MPa.
[0015] Preferably, a sealing element is arranged at a contact
position of an upper surface of the blank holder and the male die,
the blank holder applies a unit blank holding force of less than 5
MPa in step S1, and the blank holder applies a unit blank holding
force of more than 7 MPa after being adjusted in step S2.
[0016] Preferably, the die closing preforming step in step S2 is
omitted, the blank holder is replaced with a flat plate shape from
a hollow ring shape, the ultra-low temperature medium serving as
the male die is directly pressurized into the sealed cavity through
the booster pump, the plate is subject to pre-deep-drawing to
distribute the blank, then the pressure of the ultra-low
temperature medium in the sealed cavity is increased to make the
plate be gradually attached to the molded surface of the female
die, thus forming the complex curved-shaped component.
[0017] Preferably, circulation pipelines communicated with the
ultra-low temperature medium are respectively provided on the
middle of the flat plate shaped blank holder and the female die,
and a sealed cavity is kept to be formed between the blank holder
and the female die.
[0018] Preferably, the ultra-low temperature medium is liquid
nitrogen, liquid argon, or liquid helium.
[0019] Preferably, the plate is a rolled aluminum alloy plate
having a wall thickness of 0.1-10 mm, and the plate is Al--Li
alloy, Al--Cu alloy, Al--Mg--Si alloy, or Al--Zn alloy.
[0020] Compared with the prior art, the present invention obtains
the following technical effects:
[0021] In the present invention, an aluminum alloy plate deforms
under the ultra-low temperature condition, the forming performance
is remarkably improved, and the problems that high-strength
aluminum alloy is poor in normal-temperature forming plasticity and
prone to cracking are solved. The blank is distributed through die
closing preforming, and the complex curved-shaped surface is formed
through ultra-low temperature medium pressurization, and the blank
is optimally distributed according to the shape of a component,
thus local cracking can be avoided, and the wall thickness
uniformity is improved. By pressurizing the plate with the
ultra-low temperature medium, direct cooling of the plate can be
achieved, and complex molded surface matching between the male die
and the female die can also be avoided, facilitating the forming of
the complex curved-shaped components.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] To illustrate the technical solutions in the embodiments of
the present invention or in the prior art more clearly, the
following briefly introduces the accompanying drawings required for
describing the embodiments. Apparently, the accompanying drawings
in the following description show merely some embodiments of the
present invention, and those of ordinary skill in the art may still
derive other drawings from these accompanying drawings without
creative efforts.
[0023] FIG. 1 is a diagram I of an ultra-low temperature medium
pressure forming method for complex curved-shaped components in
accordance with the present invention;
[0024] FIG. 2 is a diagram II of an ultra-low temperature medium
pressure forming method for complex curved-shaped components in
accordance with the present invention;
[0025] FIG. 3 is a diagram III of an ultra-low temperature medium
pressure forming method for complex curved-shaped components in
accordance with the present invention;
[0026] FIG. 4 is a diagram IV of an ultra-low temperature medium
pressure forming method for complex curved-shaped components in
accordance with the present invention;
[0027] FIG. 5 is a diagram V of an ultra-low temperature medium
pressure forming method for complex curved-shaped components in
accordance with the present invention;
[0028] wherein, 1--female die; 2--plate; 3--blank holder;
4--ultra-low temperature medium; 5--male die; 6--prefabricated
plate blank; 7--complex curved-shaped components; 8--sealing
element; 9--booster pump; 10--ultra-low temperature vessel;
11--circulation pipeline.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0029] The following clearly and completely describes the technical
solutions in the embodiments of the present invention with
reference to the accompanying drawings in the embodiments of the
present invention. Apparently, the described embodiments are merely
a part rather than all of the embodiments of the present invention.
All other embodiments obtained by those of ordinary skill in the
art based on the embodiments of the present invention without
creative efforts shall fall within the protection scope of the
present invention.
[0030] An objective of the present invention is to provide an
ultra-low temperature medium pressure forming method for complex
curved-shaped components to solve the problem in the prior art. The
aluminum alloy plate deforms under an ultra-low temperature
condition, thus the problem of forming cracking of the complex
curved-shaped components can be avoided, and the wall thickness
uniformity and the forming efficiency are improved.
[0031] To enable the above objective, features and advantages of
the present invention to be more apparent and easily understood,
the present invention is further illustrated below with reference
to the accompanying drawings and embodiments.
Embodiment 1
[0032] As shown in FIG. 1 to FIG. 5, the embodiment provides an
ultra-low temperature medium pressure forming method for complex
curved-shaped components, a blank is distributed through die
closing preforming, and a complex curved-shaped component 7 is
formed through ultra-low temperature medium pressurization. The
plate 2 is a rolled aluminum alloy plate having a wall thickness of
0.1-10 mm, and the plate 2 is Al--Li alloy, Al--Cu alloy,
Al--Mg--Si alloy, or Al--Zn alloy, including steps as follows:
[0033] S1, the plate 2 is placed on a female die 1, a blank holding
force is applied on the blank holder 3 to make the blank holder 3
press the plate 2 tightly; before that, cooling a male die 5 is
cooled to a set temperature of lower than -160.degree. C.
[0034] S2, the male die 5 is drove to move downwards to make the
plate 2 distribute the blank in advance in a large-area mode under
the action of the female die 1 and the male die 5, thereby forming
a prefabricated plate blank 6, wherein the female die 1 and the
male die 5 are mismatched in molded surfaces, and the male die 5 is
in contact with the edge of the prefabricated plate blank 6, the
male die 5 is a cambered die in smooth transition, and a molded
surface with complex shape is arranged in the female die 1. The
blank holding force on the blank holder 3 is adjusted according to
a deep-drawing depth of the plate 2 to guarantee that a cavity
between the prefabricated plate blank 6 and the male die 5 is kept
in a sealed state. The sealing element 8 is arranged at the contact
position of the upper surface of the blank holder 3 and the male
die 5 to guarantee the sealing performance of the cavity. The blank
holder 3 applies a unit blank holding force of less than 5 MPa in
step S1, and the blank holder 3 applies a unit blank holding force
of more than 7 MPa after being adjusted in step S4.
[0035] S3, the cavity between the prefabricated plate blank 6 and
the male die 5 is filled with an ultra-low temperature medium 4
through the booster pump 9 and the circulation pipeline 11, and the
prefabricated plate blank 6 is enabled to be gradually attached to
the molded surface of the female die 1 under the pressure action of
the ultra-low temperature medium 4, thereby forming the complex
curved-shaped components.
[0036] S4, the ultra-low temperature medium 4 in the cavity is
recycled, the male die 5 is drove to move upwards, the blank holder
3 is removed, and the formed complex curved-shaped component 7 is
took out. The ultra-low temperature medium 4 is liquid nitrogen,
liquid argon, or liquid helium. A solution cavity for accommodating
the ultra-low temperature medium 4 is arranged in the male die 5,
and the solution cavity is communicated with a low-temperature
vessel 10 and the booster pump 9 through a circulation path,
wherein the low-temperature vessel 10 is used for placing the
ultra-low temperature medium 4; and the pressurization pressure of
the booster pump 9 is no more than 100 MPa.
[0037] The die closing preforming step in step S2 is omitted, the
blank holder 3 is replaced with a flat plate shape from a hollow
ring shape, the ultra-low temperature medium 4 serving as the male
die 5 is directly introduced by pressurizing the sealed cavity
through the booster pump 9, the plate 2 is subject to
pre-deep-drawing to distribute the blank, then the pressure of the
ultra-low temperature medium 4 in the sealed cavity is increased to
enable the plate 2 to be gradually attached to the molded surface
of the female die 1, thus forming the complex curved-shaped
component. Circulation pipelines 11 communicated with the ultra-low
temperature medium 4 are respectively provided on the middle of the
flat plate shape blank holder 3 and the female die 1, and a sealed
cavity is kept to be formed between the blank holder 3 and the
female die 1.
Embodiment 2
[0038] As shown in FIG. 1 to FIG. 3, a blank in the embodiment is
an aluminum alloy plate in a solid solution state 7075, having a
thickness of 1.5 mm, a length of 1200 mm, and a width of 800 mm.
The complex curved-shaped component 7 is a box-shaped part, an
opening of that has a length of 900 mm, a width of 600 mm, and a
maximum depth of 150 mm, and the bottom of the complex
curved-shaped component has a complex varying radius of curvature
and has a local concave feature. The blank is distributed by rigid
die pre-deep-drawing, then the ultra-low temperature medium 4 is
introduced for cooling and pressurized forming, including steps as
follows:
[0039] S1, the aluminum alloy plate 2 is placed on a female die 1,
and a blank holding force is applied to close a blank holder 3.
[0040] S2, a set blank holding force is applied on the blank holder
3, a male die 5 is moved downwards to a set depth 120 mm to make
the plate 2 distribute the blank in advance in a large-area mode
under the action of a rigid die; the deep-drawing and blank holding
force are adjusted to make an outer flange of the male die 5 press
a sealing element 8 installed on the blank holder 3 tightly and the
blank holder 3 press a prefabricated plate blank 6 tightly to
guarantee that a cavity between the prefabricated plate blank 6 and
the male die 5 is effectively sealed.
[0041] S3, the cavity between the prefabricated plate blank 6 and
the male die 5 is filled with liquid nitrogen serving as the
ultra-low temperature medium 4, to cool the prefabricated plate
blank 6 to be lower than -160.degree. C.
[0042] S4, the pressure of the ultra-low-temperature medium 4 is
increased to 80 MPa, and the prefabricated plate blank 6 is formed
a complex curved-shaped surface under the pressure action of the
ultra-low temperature medium 4.
[0043] S5, the ultra-low temperature medium 4 in the cavity is
recycled, the male die 5 and the blank holder 3 are drawn back, and
the formed complex curved-shaped component 7 is taken out.
[0044] The ultra-low temperature medium 4 in the embodiment may
also adopt the liquid argon.
[0045] In the embodiment, the blank is distributed through die
closing preforming, then the complex curved-shaped surface can be
formed by pressurization of ultra-low temperature medium 4; the
blank is optimally distributed according to the shape of the
component, and local cracking can be avoided and the wall thickness
uniformity can be improved. The ultra-low temperature medium 4 is
not only used for pressurizing, but also for cooling. The aluminum
alloy plate deforms under the ultra-low temperature condition, the
forming performance is obviously improved and the problem of
forming cracking of the high-strength aluminum alloy complex
curved-shaped component 7 is avoided.
Embodiment 3
[0046] As shown from FIG. 1 to FIG. 3, a blank in the embodiment is
an aluminum alloy plate in a solid solution state 2195, having a
thickness of 1.0 mm and a diameter of 1200 mm. The complex
curved-shaped component 7 is a deep-cavity multi-way part with an
opening diameter of 600 mm and a sidewall depth of 575 mm, the
bottom of the complex curved-shaped component is a special-shaped
curved surface having a maximum depth of 600 mm, and the sidewall
has four convex features. The blank is distributed by conducting
pre-deep-drawing to the maximum extent by means of rigid die
pre-cooling, and then an ultra-low temperature medium 4 is
introduced for cooling and pressurized forming of the blank,
including steps as follows:
[0047] S1, liquid nitrogen is used as the ultra-low temperature
medium 4, firstly a male die 5 is cooled to a temperature of lower
than -180.degree. C., wherein a solution cavity for circulating the
ultra-low temperature medium 4 is arranged in the male die 5.
[0048] S2, the aluminum alloy plate 2 is placed on a female die 1,
and a blank holding force is applied to close a blank holder 3.
[0049] S3, a unit blank holding force of 3 MPa is applied to the
blank holder 3, the male die 5 is moved downwards to a set depth of
575 mm to make the plate 2 be deep-drawn under the condition of
lower than -160.degree. C. to form a vertical wall cylinder; the
unit pressure of the deep-drawing and the blank holder are
increased to 7 MPa to make an outer flange of the male die 5 press
a sealing element 8 installed on the blank holder 3 tightly, then
the plate 2 is pressed tightly by the blank holder 3 to guarantee
that a cavity between the plate 2 and the male die 5 is effectively
sealed.
[0050] S4, the cavity between the plate 2 and the male die 5 is
filled with the ultra-low temperature medium 4 to cool the plate 2
to be lower than 180.degree. C.; the pressure of the ultra-low
temperature medium 4 in the cavity is increased to 60 MPa to enable
the plate 2 to form convex features on the sidewall and a complex
shape of the special-shaped curved surface at the bottom under the
pressure action of the ultra-low temperature medium 4.
[0051] S5, the ultra-low temperature medium 4 in the cavity is
recycled, the male die 5 and the blank holder 3 are drawn back, and
the formed complex curved-shaped component 7 is taken out.
[0052] In the embodiment, the blank is distributed through die
closing preforming, then the complex curved-shaped surface can be
formed by pressurization of ultra-low temperature medium 4; the
blank is optimally distributed according to the shape of the
component, and local cracking can be avoided, and the wall
thickness uniformity can be improved. The plate 2 is pre-formed
under the ultra-low temperature condition by pre-cooling a rigid
die, the blank distribution degree through preforming can be
obviously improved, and the forming limit is improved. The
ultra-low temperature medium 4 is not only used for pressurizing,
but also for cooling. The aluminum alloy plate deforms under the
ultra-low temperature condition, the forming performance is
obviously improved and the problem of forming cracking of the
high-strength aluminum alloy complex curved-shaped component 7 is
avoided.
Embodiment 4
[0053] As shown from FIG. 4 to FIG. 5, a blank in the embodiment is
an aluminum alloy plate in a solid solution state 6016, having a
thickness of 1.0 mm and a diameter of 1000 mm. The complex
curved-shaped component 7 is a special-shaped curved surface part
with an opening diameter of 600 mm and the maximum depth of 300 mm,
and the bottom of the complex curved-shaped component is a doublet
special-shaped curved surface having a deep concave feature. The
plate 2 is cooled through an ultra-low temperature medium 4, a
blank holding force is controlled to conduct deep-drawing by using
the ultra-low temperature medium 4 as a flexible male die to
distribute the blank, and then the pressure of the ultra-low
temperature medium 4 is increased to form complex local features,
including steps as follows:
[0054] S1, the aluminum alloy plate 2 is placed on a female die 1,
the blank holding force is applied to close a blank holder 3,
wherein the blank holder is flat-plate-shaped.
[0055] S2, the cavity between the plate 2 and the blank holder is
filled with liquid nitrogen serving as the ultra-low temperature
medium 4, and the plate 2 is cooled to a temperature of lower than
-160.degree. C.
[0056] S3, the blank holding force is applied on the blank holder
3, the pressure of the ultra-low temperature medium 4 in the cavity
between the plate 2 and the blank holder is increased to 10 MPa,
thus the plate 2 is deeply drawn to a large-area special-shaped
curved surface under the pressure action of the ultra-low
temperature medium 4.
[0057] S4, the blank holding force is increased to make an upper
cavity be sufficiently sealed, then the pressure of the ultra-low
temperature medium 4 is increased to 40 MPa to enable the plate 2
to form local features in a bulged manner under the pressure action
of the ultra-low temperature medium 4 until all shapes are
formed.
[0058] S5, the ultra-low temperature medium 4 in the cavity is
recycled, the blank holder 3 is drawn back, and the formed complex
curved-shaped component 7 is taken out.
[0059] The aluminum alloy plate of the embodiment always deforms
under the ultra-low temperature condition, the forming performance
is obviously improved, and the problems of poor plasticity and easy
cracking in normal-temperature forming of a high-strength aluminum
alloy are avoided. The blank is distributed through preforming of
the ultra-low temperature medium 4, thus the blank optimization
degree by preforming is improved, and the limitation of
distribution of the blank by the rigid die is avoided. The blank is
optimally distributed according to the shape of the component, the
local cracking can be avoided, and the wall thickness uniformity
can be improved. The ultra-low temperature medium 4 not only can
achieve direct cooling of the plate 2, but also can be pressurized
to form a complex feature, the complex molded surface or gap
matching difficulty between the male die 5 and the female die 1 is
reduced, facilitating the forming of the complex curved-shape
component 7.
[0060] Specific examples are used for illustration of the
principles and embodiments of the present invention in the
specification. The description of the embodiments is merely used to
help illustrate the method and its core principles of the present
invention. Meanwhile, those of ordinary skill in the art can make
various modifications in terms of specific embodiments and scope of
application in accordance with the thoughts of the present
invention. In conclusion, the content of this specification shall
not be construed as a limitation to the present invention.
* * * * *