CN107116128A - The plate electromagnetism hemmer and method of a kind of axial-radial electromagnetic force timesharing loading - Google Patents
The plate electromagnetism hemmer and method of a kind of axial-radial electromagnetic force timesharing loading Download PDFInfo
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- CN107116128A CN107116128A CN201710414348.9A CN201710414348A CN107116128A CN 107116128 A CN107116128 A CN 107116128A CN 201710414348 A CN201710414348 A CN 201710414348A CN 107116128 A CN107116128 A CN 107116128A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
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Abstract
The plate electromagnetism hemmer and method of a kind of axial-radial electromagnetic force timesharing loading, including：Axial electromagnetic force loading coil, radial electromagnetic force loading coil, flanging, cavity plate, capacitor power, axial electromagnetic force loading coil is placed within flanging, and flange workpiece is placed in the upper surface of axial electromagnetic force loading coil and flanging, radial electromagnetic force loading coil is placed in the endoporus of flange workpiece, and cavity plate is placed on flange workpiece；Radial electromagnetic force loading coil and fly-wheel diode differential concatenation, then in parallel with axial electromagnetic force loading coil, capacitor power is the coil power supply connected by discharge switch.For the plate electromagnetism flange that the present invention is loaded using the timesharing of axial-radial electromagnetic force, more existing electromagnetism flange, loaded by substep timesharing, the pad pasting of flange workpiece can be effectively improved.Meanwhile, the present invention can simply and effectively realize timesharing loading axial electromagnetic force and radial electromagnetic force using " radial electromagnetic force loading coil and fly-wheel diode differential concatenation, then in parallel with axial electromagnetic force loading coil ", and device is simple to operate, and cost is low.
Description
Technical field
The invention belongs to metal forming manufacture field, the plate of more particularly to a kind of axial direction-radial electromagnetic force timesharing loading
Electromagnetism hemmer and method, are mainly used in the flange processing of metal sheet.
Background technology
Lightweight is the important technical that energy-saving and emission-reduction are realized in the fields such as Aero-Space, auto industry.And realize light weight
The main path of change is to use light alloy material, and high-performance aluminium alloy, titanium alloy, magnesium alloy turn into modern aerospace, vapour
Turner industry etc. realizes light-weighted preferred material；Electro-magnetic forming is a kind of high-speed pulse shaping technique, can greatly improve metal
Material property, is to solve one of effective means of alloy in lightweight forming difficulty.
In existing plate electromagnetism turn-up process, the driving coil only relied on positioned at side surface of workpiece provides axial electromagnetic force, into
Discharge voltage needed for shape is high, and pad pasting hardly results in guarantee.
Electromagnetism flange is one kind of electromagnetic forming technique, the axial electromagnetic force provided at present by driving coil, pad pasting
Difference.Document " large complicated type face aluminium alloy flange part electro-magnetic forming Plastic Flow behavioral study（Mechanical engineering journal, Vol.
49, No. 24, 2013）" using the plate Plastic Flow behavior under 1 layer, 2 layers and 3 layers plate coil electromagnetism flange, hair
The flange best results of existing 3 layers of plate coil, but still the effect of not up to complete pad pasting；To find out its cause, lattice coil is to increase
Big axial electromagnetic force and do not provide radial electromagnetic force for flange workpiece.Chinese patent " a kind of electromagnetic drive forming method and
Device（CN 102248693 A）" a kind of electromagnetic drive forming method and device are disclosed, driven using pulse-electromagnetic force compound
Drift fast ram workpiece, can make workpiece high with cavity plate pad pasting, but the present invention is not pure by electromagnetic force shaping, and
It is to transmit electromagnetic force by compound punch, it is necessary to which punch-pin coordinates with cavity plate, and shaping rate is substantially reduced.
The content of the invention
Therefore, effectively to solve the problem of current electromagnetism flange pad pasting is poor, the present invention provides a kind of axial direction-radial direction electromagnetism
The plate electromagnetism hemmer and method of power timesharing loading, using the plate electromagnetism flange of axial direction-radial electromagnetic force timesharing loading,
For more existing electromagnetism flange, loaded by substep timesharing, the pad pasting of flange workpiece can be effectively improved.Meanwhile, the present invention is adopted
, can be simple with " radial electromagnetic force loading coil with fly-wheel diode differential concatenation, then in parallel with axial electromagnetic force loading coil "
Timesharing loading axial electromagnetic force and radial electromagnetic force are singly effectively realized, device is simple to operate, and cost is low.
The technical scheme that the present invention takes is：
A kind of plate electromagnetism hemmer of axial direction-radial electromagnetic force timesharing loading, including：
Axial electromagnetic force loading coil, axial electromagnetic force is provided for the flange workpiece of initial profile；
Radial electromagnetic force loading coil, the flange workpiece after being loaded for axial electromagnetic force provides radial electromagnetic force；
Flanging；
Cavity plate；
With the fly-wheel diode of radial electromagnetic force loading coil differential concatenation；
Capacitor power, is that axial electromagnetic force loading coil and radial electromagnetic force loading coil provide energy.
Axial electromagnetic force loading coil is placed within flanging, and flange workpiece is placed in axial electromagnetic force loading coil and flanging
Upper surface, radial electromagnetic force loading coil is placed in the endoporus of flange workpiece, and cavity plate is placed on flange workpiece；
Radial electromagnetic force loading coil and fly-wheel diode differential concatenation, then in parallel with axial electromagnetic force loading coil, electric capacity
Power supply is the coil power supply connected by discharge switch.
The radial electromagnetic force loading coil is hollow cylinder or hollow round table shape.
The height of the radial electromagnetic force loading coil is equal to the flange height of flange workpiece.
The overall diameter or hollow round table shape radial electromagnetic force loading coil of hollow cylinder radial electromagnetic force loading coil compared with
Small overall diameter, equal to the flange thickness of workpiece that flange inner hole of workpiece diameter subtracts twice.
The plate electromagnetism hemmer and method of a kind of axial direction of the present invention-radial electromagnetic force timesharing loading, advantage are：
1. the present invention is realized for the plate electromagnetism flange of axial direction-radial electromagnetic force timesharing loading, more traditional flange, electromagnetism into
Shape forming speed is fast, can lift the material forming limit.
2. for the plate electromagnetism flange that the present invention is loaded using the timesharing of axial direction-radial electromagnetic force, more existing electromagnetism flange,
Loaded by substep timesharing, the pad pasting of flange workpiece can be effectively improved.
3. the present invention is using " radial electromagnetic force loading coil and fly-wheel diode differential concatenation, then with axial electromagnetic force
Loading coil is in parallel ", timesharing loading axial electromagnetic force and radial electromagnetic force can be simply and effectively realized, device is simple to operate, into
This is low.
Brief description of the drawings
Fig. 1 is the plate electromagnetism hemmer assembling schematic diagram that the timesharing of axial direction-radial electromagnetic force is loaded；
Fig. 1（a）For the plate electromagnetism hemmer assembling schematic diagram of axial direction-radial electromagnetic force timesharing loading；
Fig. 1（b）Plate electromagnetism hemmer for axial direction-radial electromagnetic force timesharing loading assembles diagrammatic cross-section.
Fig. 2 is the plate of axial direction-radial electromagnetic force timesharing loading using hollow round table shape radial electromagnetic force loading coil
Electromagnetism hemmer assembling schematic diagram；
Fig. 2（a）For using the plate electricity of the axial direction of hollow round table shape radial electromagnetic force loading coil-radial electromagnetic force timesharing loading
Magnetic hemmer assembling schematic diagram；
Fig. 2（b）For using the plate electricity of the axial direction of hollow round table shape radial electromagnetic force loading coil-radial electromagnetic force timesharing loading
Magnetic hemmer assembles diagrammatic cross-section.
Fig. 3 is the plate electromagnetism method for flanging circuit connection that the timesharing of axial direction-radial electromagnetic force is loaded and pulse current signal
Figure；
Fig. 3（a）For the plate electromagnetism method for flanging circuit connection schematic diagram of axial direction-radial electromagnetic force timesharing loading；
Fig. 3（b）The plate electromagnetism method for flanging pulse current schematic diagram of axial direction-radial electromagnetic force timesharing loading.
Fig. 4 is the flange workpiece and its distribution of electromagnetic force schematic diagram of different phase；
Fig. 4（a）Flange workpiece for initial profile and its axial electromagnetic force schematic diagram being subject to；
Fig. 4（b）For the flange workpiece after axial electromagnetic force loading and its radial electromagnetic force schematic diagram being subject to；
Fig. 4（c）Flange workpiece schematic diagram after being loaded for radial electromagnetic force.
Wherein：1. axial electromagnetic force loading coil；2. radial electromagnetic force loading coil；3. flange workpiece；31. initial wheel
Wide flange workpiece；32. the flange workpiece after axial electromagnetic force loading；33. the flange workpiece after radial electromagnetic force loading；4.
Cavity plate；5. flanging；6. fly-wheel diode；7. capacitor power；8. pulse current；81. the arteries and veins of axial electromagnetic force loading coil
Rush electric current；82. the pulse current of radial electromagnetic force loading coil；9. electromagnetic force；91. axial electromagnetic force；92. radial direction electromagnetism
Power.
Embodiment
A kind of plate electromagnetism hemmer of axial direction-radial electromagnetic force timesharing loading, including：
Axial electromagnetic force loading coil 1, is that the flange workpiece 31 of initial profile provides axial electromagnetic force；
Radial electromagnetic force loading coil 2, is that the flange workpiece 32 after axial electromagnetic force loading provides radial electromagnetic force；
Flanging 5；
Cavity plate 4；
With the fly-wheel diode 6 of the differential concatenation of radial electromagnetic force loading coil 2；
Capacitor power 7, is that axial electromagnetic force loading coil 1 and radial electromagnetic force loading coil 2 provide energy.
Axial electromagnetic force loading coil 1 is placed within flanging 5, and flange workpiece is placed in axial electromagnetic force loading coil 1 and pressure
The upper surface on side 5, radial electromagnetic force loading coil 2 is placed in the endoporus of flange workpiece, and cavity plate 4 is placed on flange workpiece；
Radial electromagnetic force loading coil 2 and the differential concatenation of fly-wheel diode 6, then in parallel with axial electromagnetic force loading coil 1, electricity
It is the coil power supply connected by discharge switch to hold power supply 7.
Radial electromagnetic force loading coil 2 is that hollow cylinder is mainly simple possible, is that hollow round table shape is then to coordinate work
The shape of part deformation, makes the spacing between workpiece and coil smaller, reaches the higher purpose of coupling efficiency.
The flange height that the height of radial electromagnetic force loading coil 2 is equal to flange workpiece can make radial electromagnetic force generation efficiency
It is high.
The overall diameter or hollow round table shape radial electromagnetic force loading coil of hollow cylinder radial electromagnetic force loading coil compared with
Small overall diameter, equal to the flange thickness of workpiece that flange inner hole of workpiece diameter subtracts twice, be in order to prevent in deformation process send out
Raw geometrical interference.
A kind of plate electromagnetism method for flanging of axial direction-radial electromagnetic force timesharing loading, comprises the following steps：
First, axial electromagnetic force loading coil 1 is placed within flanging 5, and ensure its upper surface flush, flange workpiece is placed in
Axial electromagnetic force loading coil 1 and the upper surface of flanging 5, by radial electromagnetic force loading coil 2 in the endoporus of flange workpiece, and
The less one end of the external diameter of radial electromagnetic force loading coil 2 is flushed with the lower surface of flange workpiece, by cavity plate 4 be placed in workpiece it
On；
Second, by radial electromagnetic force loading coil 2 and the differential concatenation of fly-wheel diode 6, then with axial electromagnetic force loading coil 1
Parallel connection, capacitor power 7 is the coil power supply connected by discharge switch；
3rd, discharge switch is closed, capacitor power 7 discharges axial electromagnetic force loading coil 1 first, produce axial electromagnetic force and add
The pulse current of coil 1 is carried, pulse current produces inductive loop, pulse current and sensing whirlpool in the flange workpiece of initial profile
Stream interaction, produces axial electromagnetic force driving flange workpiece and accelerates and deform, the flange workpiece of initial profile is deformed into axial direction
Flange workpiece after electromagnetic force loading；
4th, when the voltage of capacitor power 7 is 0, fly-wheel diode 6 is turned on automatically, produces the arteries and veins of radial electromagnetic force loading coil 2
Electric current is rushed, pulse current produces inductive loop, pulse current and inductive loop in the flange workpiece after axial electromagnetic force loading
Interaction, produces radial electromagnetic force driving flange workpiece and accelerates and deform, the flange workpiece deformation after axial electromagnetic force loading
Flange workpiece after being loaded for radial electromagnetic force, completes flange processing.
Pulse current effective load time of axial electromagnetic force loading coil 1 is first half-wave, from 0 to t1 moment；Footpath
It is second half-wave, the moment from t1 to t2 to the pulse current of electromagnetic force loading coil 2 effective load time.Realize point of loading
When, starting the workpiece of state needs to load axial electromagnetic force, therefore the pulse current of axial electromagnetic force loading coil 1 is when effectively loading
Between for first half-wave, from 0 to t1 moment；Flange workpiece after axial electromagnetic force loading needs to load radial electromagnetic force, therefore footpath
It is second half-wave, the moment from t1 to t2 to the pulse current of electromagnetic force loading coil 2 effective load time.
Axial electromagnetic force, makes flange workpiece be deformed into the flange workpiece profile after axial electromagnetic force loading by initial profile；
Radial electromagnetic force, make flange workpiece by axial electromagnetic force load after flange workpiece profile be deformed into radial electromagnetic force loading after
Flange workpiece profile.Workpiece flange can be analyzed to axial deformation and radially expanding two processes, so the present invention is added using timesharing
Flange efficiency can be effectively improved by carrying axial electromagnetic force and radial electromagnetic force realization.Therefore flange workpiece is made by first using axial electromagnetic force
Beginning profile deformation is the flange workpiece profile after axial electromagnetic force is loaded；Flange workpiece is made by axial magnetic using radial electromagnetic force
Flange workpiece profile after power loading is deformed into the flange workpiece profile after radial electromagnetic force loading.
Embodiment 1：
Hollow cylinder radial electromagnetic force loading coil is used as shown in Figure 1, and specific steps include：Step one, by axial magnetic
Power loading coil is placed within flanging, and ensures its upper surface flush, by flange workpiece be placed in axial electromagnetic force loading coil with
The upper surface of flanging, hollow cylinder radial electromagnetic force loading coil is placed in the endoporus of flange workpiece, and make radial direction electromagnetism
The less one end of power loading coil external diameter is flushed with the lower surface of flange workpiece, and cavity plate is placed on workpiece；Second, such as Fig. 3
（a）It is shown, by radial electromagnetic force loading coil and fly-wheel diode differential concatenation, then with axial electromagnetic force loading coil simultaneously
Connection, capacitor power is the coil power supply connected by discharge switch；3rd, discharge switch is closed, capacitor power is first to axle
Discharged to electromagnetic force loading coil, produce the pulse current of axial electromagnetic force loading coil, such as Fig. 3（b）Shown, pulse current exists
Inductive loop is produced in the flange workpiece of initial profile, pulse current produces axial electromagnetic force driving with inductive loop interaction
Flange workpiece accelerates and deformed, and the flange workpiece of initial profile is deformed into the flange workpiece after axial electromagnetic force loading, such as Fig. 4
（b）It is shown；4th, when capacitor power voltage is 0, fly-wheel diode is turned on automatically, produces radial electromagnetic force loading coil
Pulse current, such as Fig. 3（b）Shown, pulse current produces inductive loop, pulse in the flange workpiece after axial electromagnetic force loading
Electric current produces radial electromagnetic force with inductive loop interaction and drives flange workpiece to accelerate and deform, after axial electromagnetic force loading
Flange workpiece is deformed into the flange workpiece after radial electromagnetic force loading, such as Fig. 4（c）It is shown, complete flange processing.
Embodiment 2：
Hollow round table shape radial electromagnetic force loading coil is used as shown in Figure 2, and specific steps include：Step one, by axial magnetic
Power loading coil is placed within flanging, and ensures its upper surface flush, by flange workpiece be placed in axial electromagnetic force loading coil with
The upper surface of flanging, hollow round table shape radial electromagnetic force loading coil is placed in the endoporus of flange workpiece, and make hollow round table
The less one end of shape radial electromagnetic force loading coil external diameter is flushed with the lower surface of flange workpiece, and cavity plate is placed on workpiece；
Second, such as Fig. 3（a）It is shown, then radial electromagnetic force loading coil and fly-wheel diode differential concatenation add with axial electromagnetic force
Coils from parallel connection of coils is carried, capacitor power is the coil power supply connected by discharge switch；3rd, close discharge switch, capacitor power
Axial electromagnetic force loading coil is discharged first, the pulse current of axial electromagnetic force loading coil, such as Fig. 3 is produced（b）It is shown, arteries and veins
Rush electric current and inductive loop is produced in the flange workpiece of initial profile, pulse current produces axially electricity with inductive loop interaction
Magnetically-actuated flange workpiece accelerates and deformed, and the flange workpiece of initial profile is deformed into the flange work after axial electromagnetic force loading
Part, such as Fig. 4（b）It is shown；4th, when capacitor power voltage is 0, fly-wheel diode is turned on automatically, is produced radial electromagnetic force and is added
Carry the pulse current of coil, such as Fig. 3（b）Shown, pulse current produces sensing in the flange workpiece after axial electromagnetic force loading
Vortex, pulse current produces radial electromagnetic force with inductive loop interaction and drives flange workpiece to accelerate and deform, axial magnetic
Flange workpiece after power loading is deformed into the flange workpiece after radial electromagnetic force loading, such as Fig. 4（c）It is shown, complete flange processing.
Claims (7)
1. a kind of plate electromagnetism hemmer of axial direction-radial electromagnetic force timesharing loading, it is characterised in that：Including：
Axial electromagnetic force loading coil（1）, it is the flange workpiece of initial profile（31）Axial electromagnetic force is provided；
Radial electromagnetic force loading coil（2）, it is the flange workpiece after axial electromagnetic force loading（32）Radial electromagnetic force is provided；
Flanging（5）；
Cavity plate（4）；
With radial electromagnetic force loading coil（2）The fly-wheel diode of differential concatenation（6）；
Capacitor power（7）, it is axial electromagnetic force loading coil（1）With radial electromagnetic force loading coil（2）Energy is provided；
Axial electromagnetic force loading coil（1）It is placed in flanging（5）Within, flange workpiece is placed in axial electromagnetic force loading coil（1）With
Flanging（5）Upper surface, radial electromagnetic force loading coil（2）In the endoporus for being placed in flange workpiece, cavity plate（4）It is placed in flange workpiece
On；
Radial electromagnetic force loading coil（2）With fly-wheel diode（6）Differential concatenation, then with axial electromagnetic force loading coil（1）
Parallel connection, capacitor power（7）It is the coil power supply connected by discharge switch.
2. the plate electromagnetism hemmer that a kind of axial direction-radial electromagnetic force timesharing is loaded according to claim 1, its feature exists
In：The radial electromagnetic force loading coil（2）For hollow cylinder or hollow round table shape.
3. the plate electromagnetism hemmer that a kind of axial direction-radial electromagnetic force timesharing is loaded according to claim 1, its feature exists
In：The radial electromagnetic force loading coil（2）Height be equal to flange workpiece flange height.
4. the plate electromagnetism hemmer that a kind of axial direction-radial electromagnetic force timesharing is loaded according to claim 1, its feature exists
In：The overall diameter or hollow round table shape radial electromagnetic force loading coil of hollow cylinder radial electromagnetic force loading coil are less outer
Diameter, equal to the flange thickness of workpiece that flange inner hole of workpiece diameter subtracts twice.
5. the plate electromagnetism method for flanging of a kind of axial direction-radial electromagnetic force timesharing loading, it is characterised in that comprise the following steps：
First, by axial electromagnetic force loading coil（1）It is placed in flanging（5）Within, and ensure its upper surface flush, by flange workpiece
It is placed in axial electromagnetic force loading coil（1）With flanging（5）Upper surface, by radial electromagnetic force loading coil（2）In flange workpiece
Endoporus in, and make radial electromagnetic force loading coil（2）The less one end of external diameter is flushed with the lower surface of flange workpiece, by cavity plate
（4）It is placed on workpiece；
Second, by radial electromagnetic force loading coil（2）With fly-wheel diode（6）Differential concatenation, is then loaded with axial electromagnetic force
Coil（1）Parallel connection, capacitor power（7）It is the coil power supply connected by discharge switch；
3rd, close discharge switch, capacitor power（7）First to axial electromagnetic force loading coil（1）Electric discharge, produces axial magnetic
Power loading coil（1）Pulse current, pulse current produces inductive loop in the flange workpiece of initial profile, pulse current with
Inductive loop interacts, and produces axial electromagnetic force driving flange workpiece and accelerates and deform, the flange workpiece deformation of initial profile
Flange workpiece after being loaded for axial electromagnetic force；
4th, work as capacitor power（7）When voltage is 0, fly-wheel diode（6）Automatic conducting, produces radial electromagnetic force loading coil
（2）Pulse current, pulse current produces inductive loop in the flange workpiece after axial electromagnetic force loading, pulse current and sense
Vortex interaction is answered, radial electromagnetic force driving flange workpiece is produced and accelerates and deform, the flange work after axial electromagnetic force loading
Part is deformed into the flange workpiece after radial electromagnetic force loading, completes flange processing.
6. the plate electromagnetism method for flanging that a kind of axial direction-radial electromagnetic force timesharing is loaded according to claim 1, its feature exists
In：Axial electromagnetic force loading coil（1）Pulse current effective load time be first half-wave, from 0 to t1 moment；It is radially electric
Magnetic force loading coil（2）Pulse current effective load time be second half-wave, the moment from t1 to t2.
7. the plate electromagnetism method for flanging that a kind of axial direction-radial electromagnetic force timesharing is loaded according to claim 1, its feature exists
In：Axial electromagnetic force, makes flange workpiece be deformed into the flange workpiece profile after axial electromagnetic force loading by initial profile；It is radially electric
Magnetic force, make flange workpiece by axial electromagnetic force load after flange workpiece profile be deformed into radial electromagnetic force loading after flange work
Part profile.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108405699A (en) * | 2018-04-02 | 2018-08-17 | 三峡大学 | A kind of the plate electromagnetism hemmer and method of vertical repulsive force-radial direction suction timesharing load |
| CN111468586A (en) * | 2020-04-13 | 2020-07-31 | 三峡大学 | Electromagnetic bulging device and method for pipe fitting based on concave coil group |
| CN111468585A (en) * | 2020-04-13 | 2020-07-31 | 三峡大学 | Simulation-based pipe fitting bulging analysis and control method for separating axial electromagnetic force |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108405699A (en) * | 2018-04-02 | 2018-08-17 | 三峡大学 | A kind of the plate electromagnetism hemmer and method of vertical repulsive force-radial direction suction timesharing load |
| CN111468586A (en) * | 2020-04-13 | 2020-07-31 | 三峡大学 | Electromagnetic bulging device and method for pipe fitting based on concave coil group |
| CN111468585A (en) * | 2020-04-13 | 2020-07-31 | 三峡大学 | Simulation-based pipe fitting bulging analysis and control method for separating axial electromagnetic force |
| CN111468585B (en) * | 2020-04-13 | 2021-08-24 | 三峡大学 | Simulation-based pipe fitting bulging analysis and control method for separating axial electromagnetic force |
| CN111468586B (en) * | 2020-04-13 | 2022-04-08 | 三峡大学 | Electromagnetic bulging device and method for pipe fitting based on concave coil group |
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| CN107116128B (en) | 2019-09-24 |
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Application publication date: 20170901 Assignee: Hubei Feiou Commercial Management Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980045280 Denomination of invention: A plate electromagnetic flanging device and method for time-sharing axial radial electromagnetic force loading Granted publication date: 20190924 License type: Common License Record date: 20231102 |