CN108188247B - A kind of subregion soft mode regulation plate precision forming device and method - Google Patents
A kind of subregion soft mode regulation plate precision forming device and method Download PDFInfo
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- CN108188247B CN108188247B CN201810180705.4A CN201810180705A CN108188247B CN 108188247 B CN108188247 B CN 108188247B CN 201810180705 A CN201810180705 A CN 201810180705A CN 108188247 B CN108188247 B CN 108188247B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000012530 fluid Substances 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims description 8
- WKPSFPXMYGFAQW-UHFFFAOYSA-N iron;hydrate Chemical compound O.[Fe] WKPSFPXMYGFAQW-UHFFFAOYSA-N 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 238000000518 rheometry Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract 1
- 239000000306 component Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
Abstract
The present invention discloses a kind of subregion soft mode regulation plate precision forming device and method, belong to sheet material forming technical field, magnetorheological fluid is injected by plunger case, press machine applies pressure-pad-force, to simplify the configuration requirement to press machine, the location conflicts for avoiding mold, flange fixing installation and magnetorheological fluid injection cylinder, reduce the difficulty of mold assembly；In addition, pass through the application of built-up coil and core assembly, the distance between electric current and iron core is adjusted in forming process, change the magnetic field strength of compartmentalization, the soft mode performance in differing formed region is set to adapt to the stress state needs of plate, the flowing for promoting material, realizes the Precise control of forming process, to improve sheet material forming and part forming quality.This method has great application value in the precision form of complicated shape thin-wall member.
Description
Technical field
The present invention relates to sheet material forming technical field, specially a kind of subregion soft mode regulation plate precision forming device and
Method.
Background technique
With the fast development in the fields such as Aeronautics and Astronautics and automobile, sheet metal part manufacture is gradually to lightweight, high-precision
The trend development of degree and low cost.The difficulty that due to this kind of component there is complex-shaped, thin-walled, integral forming, material difficulty to shape
Point, conventional forming techniques are easy to uneven deformation, rupture or ridging defect occur, constrain the extensive use of such component.
Plate magnetorheological fluid flexible die forming method is a kind of new flexible die forming method, it uses intellectual material --- magnetic current
Become liquid, provides magnetic field by coil or permanent magnet etc., change the characteristic of magnetorheological fluid in forming process, make soft mode mechanical property
The needs of Sheet Metal Forming are more suitable, to improve the formability of plate and the forming quality of part.
Patent of invention ZL.201210092979.0 " a kind of plate magnetorheological fluid flexible die forming device and method " is proposed and is adopted
The device and method of sheet material forming, forming process are carried out with magnetorheological fluid soft mode are as follows: plate to be formed is clamped in cavity plate
Upper surface and magnetorheological fluid hold between the lower surface of frame；Fill magnetorheological fluid in first inner chamber, in forming process, the first magnetic current
Become liquid injection cylinder and the second magnetorheological fluid injection cylinder injects magnetorheological fluid into first inner chamber；According to the shape of plate to be formed and
Soft mode action mode determines working region magnetic field strength B；Solenoid is connect with DC power supply, makes magnetic current by adjusting electric current
The magnetic field strength for becoming liquid region changes, and plate to be formed is made to shape required shape under the change states of matter of magnetorheological fluid
Shape；Magnetorheological fluid is held frame to open, the plate after forming is taken out.But it using the above method in Sheet Metal Forming, is relating to
And injection, the load of pressure-pad-force and the load in magnetic field to magnetorheological fluid, it easily causes mold, flange fixing installation and magnetorheological fluid and infuses
The location conflicts for entering cylinder increase the difficulty of device assembly；In addition, this method can only apply uniform magnetic field, it is multiple for shape
Miscellaneous, the part that different zones deformation extent differs greatly is difficult to the magnetic field of applying zone, and then is difficult to realize forming process
Precise control.
Summary of the invention
The purpose of the present invention is poor to soft mode performance zonesization in complicated shape part magnetorheological fluid flexible die forming to solve
Different requirement provides a kind of subregion soft mode regulation plate precision forming device and method using built-up coil and assembling iron core.
The present invention is to be achieved through the following technical solutions:
A kind of subregion soft mode regulates and controls plate precision forming device, including the first core assembly, cavity plate, first coil, the
Two coil, plate, magnetorheological fluid, plunger case, plunger, medium cylinder, the second core assembly；
The medium cylinder bottom closing, top are provided with opening, and plunger case is connected to medium cylinder, and plunger is mounted on plunger case
Interior, magnetorheological fluid is filled in the inner cavity of medium cylinder and plunger case, and cavity plate is located above medium cylinder, and plate to be formed is clamped in
Between cavity plate and medium cylinder；
First coil is provided on the cavity plate, the second coil is located at below medium cylinder to be correspondingly arranged with first coil, the
One core assembly is located at the inside of first coil, and the second core assembly is located at the inside of coil.
Optionally, first core assembly includes the first cylinder iron core and several first annular iron cores, and described first
Cylinder iron core and the coaxial arrangement of first annular iron core, second core assembly include the second cylinder iron core and several second rings
Shape iron core, the second cylinder iron core and the coaxial arrangement of the second annular core.
Optionally, including two plunger cases and two plungers, two plunger cases are located at two sides and the medium of medium cylinder
Cylinder connection, two plungers are separately mounted in plunger case.
Optionally, it is provided with the circular hole for connecting with plunger case on the medium cylinder side wall, the Circularhole diameter is 10 ~
15mm。
Based on a kind of manufacturing process of subregion soft mode regulation plate precision forming device provided by the invention, including it is following
Step:
Magnetorheological fluid is injected into the inner cavity of medium cylinder by step 1, makes dielectric surface and upper level, by plate to be formed
Material is placed between medium cylinder upper surface and cavity plate lower surface, and applies pressure-pad-force F, and plate to be formed is clamped；
Step 2, to first coil and the second coil input current, the second core assembly holding position is constant, adjusts first
The distance between core assembly and the second core assembly, to adjust the magnetic field strength of shaped region；
Step 3 applies speed V to plunger1, deform plate under the effect of magnetorheological hydraulic power；
Step 4 applies anti-speed degree V to plunger2, it is back to magnetorheological fluid in plunger case, cavity plate 3 is opened, after forming
Part take out.
Optionally, in step 2 the distance between the first core assembly and the second core assembly adjustable range be 30mm ~
80mm。
Optionally, 0 < B < 0.5T of field region intensity described in step 2.
Optionally, in step 3 plunger speed V1Range is 0.2mm/s ~ 0.4mm/s.
Optionally, in step 4 plunger anti-speed degree V2Range is 0.1mm/s ~ 0.2mm/s.
Optionally, magnetorheological fluid 6 described in step 1 includes hydroxy iron powder and silicone oil, wherein hydroxy iron powder content is 35%
~48%。
Compared with prior art, the invention has the following beneficial technical effects:
A kind of subregion soft mode regulation plate precision forming device provided by the invention and method, inject magnetic by plunger case
Rheology liquid, press machine apply pressure-pad-force and avoid mold, flange fixing installation and magnetic to simplify the configuration requirement to press machine
Rheology liquid injects the location conflicts of cylinder, reduces the difficulty of mold assembly；In addition, answering by built-up coil and core assembly
With adjusting the distance between electric current and iron core in forming process, change the magnetic field strength of compartmentalization, make the soft of differing formed region
The stress state that mould performance adapts to plate needs, and promotes the flowing of material, realizes the Precise control of forming process, to improve
Sheet material forming and part forming quality.This method has in the precision form of complicated shape thin-wall member greatly applies valence
Value.
Detailed description of the invention
Fig. 1 be regulate and control that plate accurate forming method treats that shaped sheet is formed using subregion soft mode of the present invention just
Overall structural main section view when beginning state；
Fig. 2 is overall structural main section view of the invention when being formed into certain phase；
In figure: 1-1. the first cylinder iron core, the first annular iron core of 2-1., 3. cavity plates, 4-1. first coil, 5. plates, 6.
Magnetorheological fluid, the first plunger case of 7-1., the second plunger case of 7-2., the first sealing ring of 8-1., the second sealing ring of 8-2., 9-1. first
Plunger, the second plunger of 9-2., 10. medium cylinders, 1-2 the second cylinder iron core, the second annular core of 2-2., the second coil of 4-2..
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
Embodiment one
A kind of subregion soft mode regulation plate precision forming device, including the first core assembly, cavity plate 3, first coil 4-
1, the second coil 4-2, plate 5, magnetorheological fluid 6, plunger case, plunger, medium cylinder 10, the second core assembly；
The closing of 10 bottom of medium cylinder, top are provided with opening, and plunger case is connected to medium cylinder 10, and plunger is mounted on plunger case
Interior, magnetorheological fluid 6 is filled in the inner cavity of medium cylinder 10 and plunger case, and cavity plate 3 is located at 10 top of medium cylinder, plate quilt to be formed
It is clamped between cavity plate 3 and medium cylinder 10；
First coil 4-1 is provided on cavity plate 3, the second coil 4-2 is located at corresponding with first coil 4-1 below medium cylinder set
It sets, the first core assembly is located at the inside of first coil 4-1, and the second core assembly is located at the inside of the second coil 4-2.
First core assembly includes the first cylinder iron core 1-1 and several first annular iron core 2-1, the first cylinder iron core 1-
1 and first annular iron core 2-1 coaxial arrangement, second core assembly include the second cylinder iron core 1-2 and several second rings
Shape iron core 2-2, the second cylinder iron core 1-2 and the second annular core 2-2 coaxial arrangement.
A kind of subregion soft mode regulation plate precision forming device provided in an embodiment of the present invention may include two plungers
Cylinder and two plungers, the two sides that two plunger cases are located at medium cylinder 10 are connected to medium cylinder 10, and two plungers are installed respectively
In plunger case.The circular hole for connecting with plunger case is provided on 10 side wall of medium cylinder, the Circularhole diameter is 10 ~ 15mm.
A kind of manufacturing process of subregion soft mode regulation plate precision forming device, comprising the following steps:
Magnetorheological fluid is injected into the inner cavity of medium cylinder 10, makes dielectric surface and upper level by step 1, will be to be formed
Plate 5 is placed between 3 lower surface of 10 upper surface of medium cylinder and cavity plate, and applies pressure-pad-force F, and plate 5 to be formed is clamped；
Step 2, to first coil 4-1 and the second coil 4-2 input current, the second core assembly holding position is constant, adjusts
The distance between the first core assembly and the second core assembly are saved, to adjust the magnetic field strength of shaped region；
Step 3 applies speed V to plunger1, deform plate under the effect of magnetorheological hydraulic power；
Step 4 applies anti-speed degree V to plunger2, it is back to magnetorheological fluid in plunger case, cavity plate 3 is opened, after forming
Part take out.
The distance between the first core assembly and the second core assembly adjustable range are 30mm ~ 80mm, magnetic field in step 2
0 < B < 0.5T of field strength.
The speed V of plunger in step 31Range is 0.2mm/s ~ 0.4mm/s.
The anti-speed degree V of plunger in step 42Range is 0.1mm/s ~ 0.2mm/s.
Magnetorheological fluid 6 described in step 1 includes hydroxy iron powder and silicone oil, wherein hydroxy iron powder content is 35% ~ 48%.
Embodiment two
As shown in Figure 1, a kind of subregion soft mode regulates and controls plate precision forming device, including the first cylinder iron core 1-1, first
Annular core 2-1, cavity plate 3, first coil 4-1, plate 5, magnetorheological fluid 6, the first plunger case 7-1, the first sealing ring 8-1,
One plunger 9-1, medium cylinder 10, the second cylinder iron core 1-2, the second annular core 2-2 and the second coil 4-2；
The closing of 10 bottom of medium cylinder, opened upper end, and it is provided with flanging muscle, there are two circular holes on side wall, with the first plunger
Cylinder 7-1 and the second plunger case 7-2 connection.Cavity plate 3 is located at 10 top of medium cylinder, and plate to be formed is clamped in cavity plate 3 and medium
Between cylinder 10, annular groove is opened up inside cavity plate 3, first coil 4-1 is placed in inside, and the second coil 4-2 is corresponding with first coil 4-1
It places, is located at 10 lower section of medium cylinder.First cylinder iron core 1-1 is located inside first annular iron core 2-1, and the two is placed in cavity plate 3
Portion.Second cylinder iron core 1-2 and the second annular core 2-2 is located inside the second coil 4-2.The two and the first cylinder iron core 1-1
It is placed in 10 lower section of medium cylinder in pairs with first annular iron core 2-1.Magnetorheological fluid 6 be located at medium cylinder 10 and plunger case composition it is interior
In chamber.First plunger 9-1 is located inside the first plunger case 7-1, and the two contact surface is provided with the first sealing ring 8-1.
Wherein, cavity plate 3, the first plunger case 7-1 and the second plunger case 7-2 are made by non-magnetic austenitic stainless steel.Choosing
Selecting the material can make the shaped region magnetic line of force pass through magnetorheological fluid completely, and the performance of magnetorheological fluid is made to change.
Wherein, be connected on 10 side wall of medium cylinder with the first plunger case 7-1 and the second plunger case 7-2 Circularhole diameter be 10 ~
15mm.It selects the bore dia that can guarantee the flowing loading speed of magnetorheological fluid 6, and can guarantee that the intensity of medium cylinder 10 meets
Requirement.
It should be noted that the first core assembly provided in an embodiment of the present invention and the second annular core component can be together
Thimble shape core assembly is also possible to the core assembly of multiple cylindrical member combinatorial compounds, according to different molding demands, selection
Core assembly of different shapes, to adjust the magnetic field strength of shaping position everywhere.
A kind of subregion soft mode regulation plate accurate forming method, is realized by following steps:
Magnetorheological fluid 6 is injected into the inner cavity of medium cylinder 10, makes dielectric surface and upper level by step 1, will at
Shape plate 5 is placed between 3 lower surface of 10 upper surface of medium cylinder and cavity plate, and applies pressure-pad-force F, and plate 5 to be formed is clamped；
Step 2, to first coil 4-1 and the second coil 4-2 input current, the annular iron of the second cylinder iron core 1-2 and second
The holding position core 2-2 is constant, adjusts the first cylinder iron core 1-1, the second cylinder iron core 1-2 and first annular iron core 2-1, the second ring
The distance between shape iron core 2-2, so that shaped region magnetic field strength is occurred is respectively B1And B2Two regions；
Step 3 applies speed V to the first plunger 9-1 and the second plunger 9-2 respectively1, make plate in magnetorheological fluid pressure
The lower deformation of effect.
Step 4 applies anti-speed degree V to the first plunger 9-1 and the second plunger 9-2 respectively2, magnetorheological fluid is made to be back to
In one plunger case 7-1 and the second plunger case 7-2, cavity plate 3 is opened, the part after forming is taken out.
Wherein, the first cylinder iron core 1-1, the second cylinder iron core 1-2 and first annular iron core 2-1, the second ring in step 2
The distance between shape iron core 2-2 adjustable range is 30mm ~ 80mm.The adjustable range can guarantee shaped region to magnetic field strength
It needs.
The B of field region intensity described in step 21And B2, in forming 0 < B of initial stage1< B2< 0.5T, after forming 0 < of phase
B2< B1< 0.5T.Using such method of adjustment, forming initial stage edge magnetorheological fluid can be made to level off to approximate solid-state, promoted
Die entrance material center region flowing nearby；The later period is shaped, central area magnetic field is bigger, concentrates part deformation, obtains
Bigger deformation extent.So that entire forming process material is flowed more reasonable in this way, improves the formability of plate.
The speed V of first plunger 9-1 and the second plunger 9-2 in step 31Range is 0.2mm/s ~ 0.4mm/s.Using this
The magnetorheological fluid injection rate of sample can make the deformation of plate be maintained at preferable velocity interval.
The anti-speed degree V of first plunger 9-1 and the second plunger 9-2 in step 42Range is 0.1mm/s ~ 0.2mm/s.Using
To avoid the part after forming secondary deformation can occur for magnetorheological fluid discharge rate slower in this way.
6 main component of magnetorheological fluid described in step 1 is hydroxy iron powder and silicone oil, and iron content range is 35% ~ 48%.
There is preferable property regulation range using the magnetorheological fluid of this kind of component content.
The specific embodiment that the present invention is lifted is only the annotation to the invention spirit, person skilled in the art of the present invention
It can modify to the specific embodiment of description or similar method substitutes, without departing from spirit of the invention.
Claims (8)
1. a kind of subregion soft mode regulates and controls plate precision forming device, which is characterized in that including the first core assembly, cavity plate (3),
First coil (4-1), the second coil (4-2), magnetorheological fluid (6), medium cylinder (10), the second core assembly；
Medium cylinder (10) the bottom closing, top are provided with opening, and medium cylinder (10) includes two plunger cases and two plungers,
The two sides that two plunger cases are located at medium cylinder are connected to medium cylinder (10), and two plungers are separately mounted in plunger case；Magnetic
Rheology liquid (6) is filled in medium cylinder (10) and the inner cavity of plunger case, and cavity plate (3) is located above medium cylinder (10), plate to be formed
Material (5) is clamped between cavity plate (3) and medium cylinder (10)；
It is provided with first coil (4-1) on the cavity plate (3), the second coil (4-2) is located at below medium cylinder (10) and First Line
Circle (4-1) is correspondingly arranged, and the first core assembly is located at the inside of first coil (4-1), and the second core assembly is located at the second coil
The inside of (4-2)；First core assembly includes the first cylinder iron core (1-1) and several first annular iron cores (2-1), and described the
One cylinder iron core (1-1) and first annular iron core (2-1) coaxial arrangement, second core assembly include the second cylinder iron core
(1-2) and several second annular cores (2-2), the second cylinder iron core (1-2) and the second annular core (2-2) are coaxially set
It sets.
2. a kind of subregion soft mode as described in claim 1 regulates and controls plate precision forming device, which is characterized in that the medium
The circular hole for connecting with plunger case is provided on cylinder (10) side wall, the Circularhole diameter is 10 ~ 15mm.
3. the forming based on a kind of regulation plate precision forming device of subregion soft mode described in any one of claims 1 to 2
Method, which comprises the following steps:
Magnetorheological fluid (6) is injected into the inner cavity of medium cylinder (10) by step 1, and plate to be formed (5) is placed in medium cylinder
(10) between upper surface and cavity plate (3) lower surface, and apply pressure-pad-force F, plate to be formed (5) are clamped；
Step 2, to first coil (4-1) and the second coil (4-2) input current, the second core assembly holding position is constant, adjusts
The distance between the first core assembly and the second core assembly are saved, to adjust the magnetic field strength of shaped region；
Step 3 applies speed V to plunger1, deform plate under the effect of magnetorheological hydraulic power；
Step 4 applies anti-speed degree V to plunger2, it is back to magnetorheological fluid in plunger case, opens cavity plate (3), after forming
Plate takes out.
4. the manufacturing process of subregion soft mode regulation plate precision forming device as claimed in claim 3, which is characterized in that step
The distance between first core assembly and the second core assembly adjustable range are 30mm ~ 80mm in rapid two.
5. the manufacturing process of subregion soft mode regulation plate precision forming device as claimed in claim 3, which is characterized in that step
0 < B < 0.5T of field region intensity in rapid two.
6. the manufacturing process of subregion soft mode regulation plate precision forming device as claimed in claim 3, which is characterized in that step
The speed V of plunger in rapid three1Range is 0.2mm/s ~ 0.4mm/s.
7. the manufacturing process of subregion soft mode regulation plate precision forming device as claimed in claim 3, which is characterized in that step
The anti-speed degree V of plunger in rapid four2Range is 0.1mm/s ~ 0.2mm/s.
8. the manufacturing process of subregion soft mode regulation plate precision forming device as claimed in claim 3, which is characterized in that step
Magnetorheological fluid described in rapid one (6) includes hydroxy iron powder and silicone oil, wherein hydroxy iron powder content is 35% ~ 48%.
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| CN1864884A (en) * | 2006-06-16 | 2006-11-22 | 重庆工学院 | Sheet material mold-free multi-point forming device based on viscous medium transfer force and method |
| CN101537453A (en) * | 2009-04-10 | 2009-09-23 | 哈尔滨工业大学 | Pressure control method for forming aluminum alloy covering part viscoelastic-plastic soft mode |
| CN102615164A (en) * | 2012-03-31 | 2012-08-01 | 哈尔滨工业大学 | Magnetorheological fluid flexible die forming device and magnetorheological fluid flexible die forming method for plates |
| CN102921790A (en) * | 2012-11-26 | 2013-02-13 | 哈尔滨理工大学 | Sheet material hydro-mechanical deep drawing forming device and method using magnetic medium to pressurize |
| JP2015182115A (en) * | 2014-03-25 | 2015-10-22 | 株式会社神戸製鋼所 | Manufacturing method of molding |
| CN104874662A (en) * | 2015-04-29 | 2015-09-02 | 哈尔滨理工大学 | Magnetic medium damping type special-shaped plate forming device and magnetic medium damping type special-shaped plate forming method |
| CN106734499A (en) * | 2016-12-01 | 2017-05-31 | 湘潭大学 | Sheet material warms electro-hydraulic high speed impact quasistatic hydraulic pressure compound molding device and the sheet material forming method realized using the device |
| CN106914527A (en) * | 2017-03-21 | 2017-07-04 | 天津职业技术师范大学 | It is a kind of based on magnetosensitive can phase transformation soft material sheet metal magnetic temperature dual control warm working device and method |
| CN107138590A (en) * | 2017-06-19 | 2017-09-08 | 中南大学 | It is a kind of that the device and method that sheet material hole flanging shapes is driven using multidirectional magnetic field force |
| CN207026231U (en) * | 2017-06-27 | 2018-02-23 | 华中科技大学 | A kind of electromagnetic forming device based on cryogenic conditions |
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