CN107030172B - A kind of electromagnetic casting method and device based on tubing under background magnetic field - Google Patents
A kind of electromagnetic casting method and device based on tubing under background magnetic field Download PDFInfo
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- CN107030172B CN107030172B CN201710331863.0A CN201710331863A CN107030172B CN 107030172 B CN107030172 B CN 107030172B CN 201710331863 A CN201710331863 A CN 201710331863A CN 107030172 B CN107030172 B CN 107030172B
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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
Abstract
The invention discloses a kind of electromagnetic casting method and devices based on tubing under background magnetic field.Device proposed by the present invention includes Helmholtz coil system, supporting rod, upper and lower support plate, drive rod, pulse discharge circuit and form-wound coil.Background magnetic field and pulsed magnetic field are combined the uniform bulging of electromagnetism for realizing tubing (such as aluminium-alloy pipe) by the present invention.By the tubing of high-speed deformation in background magnetic field, the uneven resistance field formed by electromagnetic damping hinders the imperfect flow of its corresponding plastic deformed area, tubing is made not occur local reduction or spalling, to obtain Plastic Flow uniformly qualified tube expansion part.Helmholtz coil system of the present invention can accurately control the input energy of background magnetic field, the final shaping form of tubing is set to be precisely controlled, so as to avoid the deficiencies of bulging part size fluctuation is big, process repeatability is poor in traditional electromagnetism free bulge technique, it is advantageously implemented mass, mechanization and the standardization of the technique.
Description
Technical field
The invention belongs to materials plastic forming fields, and in particular to a kind of electromagnetism based on tubing under background magnetic field without mould at
Shape method and device.
Background technology
Electro-magnetic forming is to make metal material that the manufacturing process that high-speed is plastically deformed occur using Lorentz force.It is electric when forming
It can be converted into high-pressure shocking wave in very short time, acted on blank with impulse form, blank moment is made to obtain high change
Shape speed then issues raw plastic deformation in inertia force effect.The technology is mainly used in aerospace, weapons, electronics and vapour
The fields such as vehicle manufacture, specifically using more in the free bulge technique of tubing.
When tubing carries out electromagnetism free bulge, after closure switch, there is " kelvin effect " in the induced current induced, with this
Meanwhile there is " end effect " in tubing both ends, eventually lead to the distribution of the electromagnetic force of each point on tubing radially and axially all again
It is uneven.After electromagnetic pulse effect, tubing carries out free bulge under inertia force effect with great deformation velocity, due to above-mentioned
Two kinds of effects are formed by uneven electromagnetic force field, eventually lead to the tube expansion part after electromagnetism free bulge and large-scale plasticity occur
Phenomena such as flowing the serious even spalling of uneven, local reduction, the phenomenon is in short pipe fitting electromagnetism free bulge and tensioner ring experiment
It is particularly evident.
Due to electromagnetism free bulge pipe deformations when there is no mould constraint, how to control material plastic flow, avoid office
Even spalling is thinned in portion, is always the technical barrier of technique core the most.Currently, domestic and foreign scholars are generally from " accurately controlling
The thinkings such as discharge energy, optimization loop construction " are set out, in the hope of solving this problem.But this method operates difficulty in practical applications
To spend larger, process repeatability is poor, and the tube expansion part obtained dimensionally has certain uncontrollable fluctuation, can not stablize,
The uniform tube expansion part of constant dimension is accurately obtained, and the technique is also not suitable for mass production requirement.
Invention content
For overcome the Plastic Flow in the presence of existing tubing electromagnetism free bulge technology is uneven, local reduction seriously very
To there is the deficiencies of spalling crackle, the present invention provides a kind of electromagnetic casting method and dress based on tubing under background magnetic field
It sets.To solve, operation difficulty present in the prior art is big, process repeatability is poor, size fluctuation is uncontrollable, is not suitable for batch
Change the technical problems such as production requirement.
According to one aspect of the present invention, it is proposed that a kind of tubing includes the following steps without mould electromagnetic forming method：
(1) form-wound coil is fixed, both ends connect pulse discharge circuit；
(2) tubing that will be shaped is set in outside form-wound coil, and adjustment tubing position is allowed to and form-wound coil coaxial line point
Cloth；Between the two away from preferably 1mm or so；
(3) power supply for connecting background magnetic field generation device generates stable, uniform background magnetic field；Adjust background magnetic field production
Generating apparatus makes background magnetic field only occur on the outside of tubing；
(4) make pulse discharge circuit, electric current generate pulsed magnetic field by form-wound coil；
The vortex opposite with pulsed magnetic field direction will be induced on tubing to be formed, the Lorentz force caused by vortex
Under effect, high-speed deformation occurs for tubing, and into background magnetic field area, dissection, shape are generated to the background magnetic field magnetic induction line in the area
At corresponding induced current, to generate the electromagnetic force opposite with cut direction under background magnetic field effect, that is, electromagnetism resistance occurs
Buddhist nun's phenomenon hinders the uneven Plastic Flow that tubing is generated by " end effect " and " kelvin effect ", to realize electromagnetism
Mouldless shaping.
Preferably, the background magnetic field is generated using Helmholtz coil system.
It is another aspect of this invention to provide that propose a kind of no mould electromagnetic forming device, including Helmholtz coil system, branch
Strut, upper and lower support plate, drive rod, pulse discharge circuit and form-wound coil；Wherein：
The Helmholtz coil system includes several to upper and lower symmetrically arranged coil, and wherein lower coil is fixed on
On lower supporting plate, location arrangements of the lower coil on the lower supporting plate in the outside of the excircle of the form-wound coil, on
Portion's coil is fixed on upper backup pad, outer circle of location arrangements of the upper coil on the upper backup pad in the form-wound coil
The outside in week enables the background magnetic field that Helmholtz coil system is formed to cover the deformed region of the tubing, upper and lower support plate
And it the parameter of each pair of coil and is distributed symmetrically thereon；
The Helmholtz coil system can be by adjusting the relative position between wherein each pair of coil, to adjust background
The distributed areas in magnetic field；
The supporting rod is more adjustable rods, is located between upper and lower support plate, for adjusting upper and lower support plate
Between spacing, be formed by background magnetic field intensity so as to adjust Helmholtz coil system, make axis side between upper and lower coil
It is uniform to Distribution of Magnetic Field；
The drive rod is respectively set in upper and lower support plate, and among support plate；The form-wound coil is located at
Between upper and lower drive rod, the driving pole length is adjustable, the position for fixing form-wound coil；
The form-wound coil is for generating pulsed magnetic field, making tubing that high-speed deformation occur；
The pulse discharge circuit includes switch, resistance and the capacitor group of concatenation, its two terminations arteries and veins of the form-wound coil
Impulse electricity circuit constitutes a pulse discharge loop, for generating pulsed magnetic field with it.
Preferably, it is axial to be set as tubing to be formed for each coil vertical direction spacing of the Helmholtz coil system 1
1-1.3 times of length.
Preferably, the form-wound coil is close around multiturn helical coil structure, and is carried out according to the size of tubing to be formed
Loose fit designs；Tubing and form-wound coil to be formed gap is preferably 1mm.
Preferably, the tubing to be formed is the preferable tubing of conductivity, including aluminium-alloy pipe and copper alloy tube.
Preferably, the form-wound coil is rectangular section, and coil radial section accumulates 10-25mm2, material is copper alloy, more
Circle is close around structure.
Preferably, the tubing top is equipped with the spacing no more than 5mm with coil, so that blank end can be radially
Free Transform, to obtain uniform tube expansion part.
A kind of electromagnetic casting method based on above-mentioned building mortion, includes the following steps：
(1) forming tube is intended to be sleeved on outside form-wound coil；
(2) supporting rod is adjusted, so as to adjust each spacing to upper lower coil in Helmholtz coil system, so that coil is logical
The background magnetic field formed after electricity meets the required intensity of forming；
(3) drive rod is adjusted, to fix the position of form-wound coil；
(4) position for adjusting tubing to be formed, makes itself and the concentric placement of form-wound coil；
(5) Helmholtz coil system is connected, background magnetic field is formed；
(6) make pulse discharge circuit switchs, and capacitor group starts to discharge, and pulse current is generated in form-wound coil, from
And pulsed magnetic field is formed, while according to the right-hand rule, the vortex opposite with pulsed magnetic field direction is induced on tubing to be formed,
Under the action of Lorentz force caused by vortex, which occurs high-speed deformation, into background magnetic field area, to the magnetic induction line in the area
Generate dissection；
The magnetic induction line of the tubing cutting background magnetic field of high-speed deformation, generates corresponding induced current, in background magnetic field
Effect is lower to be generated and cut direction opposing electromagnetic power, i.e. generation electromagnetic damping phenomenon；The electromagnetic force of generation hinders tubing because of " end
Portion's effect " and " kelvin effect " and generate uneven Plastic Flow, to realize electromagnetic casting；" end effect "
Refer to magnetic field the phenomenon that pipe end disperses, magnetic field intensity is caused to reduce；" kelvin effect " refers to induced field in pipe
The phenomenon that radially magnetic field intensity is gradually reduced on material surface.
The principle of the present invention is, in the case where Helmholtz coil system forms stationary background magnetic field background, make pulse electric discharge
Contactor, tubing to be formed moment under the action of form-wound coil pulse-electromagnetic force obtain very big deformation velocity, start freely
Bulging.Deformed region enters background magnetic field on tubing, cuts background magnetic field magnetic induction line, forms the electromagnetism opposite with deformation direction
To hinder it further to deform electromagnetic damping phenomenon occurs for power.The deformation velocity in different plastic area is each on known tubing
It differs, from electromagnetic force formula F=BLv：Different plastic area can form electricity corresponding thereto in background magnetic field
The magnetic resistance field of force, it is bigger that the more violent region of plastic deformation is formed by resistance.Therefore, the non-uniform plasticity of Plastic Flow on tubing
Deformed area under its constraint for being formed by uneven resistance field, it is final obtain Plastic Flow uniformly, without local reduction or spalling
Qualified tube expansion part.
The present invention has the advantages that：
The present invention background magnetic field and pulsed magnetic field are combined realize pipe part (such as aluminium-alloy pipe) electromagnetism it is uniformly swollen
Shape method.By the tubing of high-speed deformation in background magnetic field, the uneven resistance field formed by electromagnetic damping phenomenon hinders
The imperfect flow of corresponding plastic deformed area on tubing, makes tubing not occur local reduction or spalling, to obtain Plastic Flow
Uniform qualification tube expansion part.
The present invention forms compressive stress state in swollen outer surface of pipe fittings, has not only improved the stress distribution of swollen outer surface of pipe fittings, but also
The spalling defect often occurred in traditional electromagnetism free bulge technique is overcome, to substantially increase tubing electromagnetism free bulge
Forming limit.
Helmholtz coil system of the present invention can accurately control the input energy of background magnetic field, make tubing
Final shaping form is precisely controlled, larger so as to avoid bulging part size fluctuation in traditional electromagnetism free bulge technique,
The deficiencies of process repeatability is poor is advantageously implemented mass, mechanization and the standardization of the technique.
The present invention is great innovatively to be proposed to constrain the tubing of high-speed deformation by additional background magnetic field, utilizes electromagnetism
The different plastic area of damping phenomena, i.e. tubing will form corresponding different electromagnetic resistances field, to be precisely controlled part
Outer surface stress state and final shape, this method are that electromagnetic casting opens completely new Research Thinking, great novelty
And directive significance.
Description of the drawings
Fig. 1 is the building mortion schematic diagram of the present invention；
Fig. 2 is the principle of the present invention figure；
Fig. 3 a are tube bulge original state schematic diagram；
Fig. 3 b are material forming schematic diagram of the tubing after electromagnetic pulse acts on；
Fig. 3 c and Fig. 3 d be high-speed motion tubing in background magnetic field deformation process schematic diagram；
Fig. 3 e are material forming schematic diagram of the tubing after electromagnetic pulse effect and background magnetic field effect；
In figure：1- Helmholtz coil systems, 2- supporting rods, 3- support plates, 4- drive rods, 5- switches, 6- resistance, 7- electricity
Container group, 8- tubing to be formed, 9- form-wound coils, 10- background magnetic fields, 11- pulsed magnetic fields.
Specific implementation mode
The specific implementation mode of the present invention is described further below in conjunction with the accompanying drawings.It should be noted that for
The explanation of these embodiments is used to help understand the present invention, but does not constitute limitation of the invention.In addition, disclosed below
The each embodiment of the present invention in involved technical characteristic can be combined with each other as long as they do not conflict with each other.
It is a kind of electromagnetic casting schematic device based on tubing under background magnetic field, including Hai Muhuo as shown in Figure 1
Hereby coil system 1, supporting rod 2, support plate 3, drive rod 4, switch 5, resistance 6, capacitor group 7, tubing to be formed 8 and shaped wire
Circle 9.Switch 5, resistance 6 and capacitor group 7 are composed in series electromagnetic pulse generating means, the form-wound coil 9 and the electromagnetic pulse
Generating means is connected, to form required pulsed magnetic field 11；Helmholtz coil system 1 is fixed in support plate 3, support plate
3 include upper backup pad and lower supporting plate, and Helmholtz coil system 1 includes several to upper and lower symmetrically arranged coil, wherein under
Portion's coil is fixed on lower supporting plate, location arrangements of the lower coil on lower supporting plate form-wound coil excircle it is outer
Side, upper coil are fixed on upper backup pad, excircle of location arrangements of the upper coil on upper backup pad in form-wound coil
Outside, so that the background magnetic field 10 that Helmholtz coil system is formed is covered the deformed region of tubing 8 to be formed, upper and lower branch
It fagging and the thereon parameter of each pair of coil and is distributed symmetrically；Helmholtz coil system 1 can be changed by adjusting drive rod 4
Spacing, be allowed to form required background magnetic field 10；Tubing 8 to be formed and the concentric placement of form-wound coil 9.
Using above-mentioned apparatus based on the electromagnetic casting method of tubing under background magnetic field, include the following steps：
(1) form-wound coil 9 is placed on inside tubing 8 to be formed；
(2) it connects motor driving supporting rod 2 to move down, the spacing of adjustment Helmholtz coil system 1, and adjusts drive rod 4
Form-wound coil 9 is positioned, the spacing of Helmholtz coil system 1 approximate can be set as the 1-1.3 of 8 axial length of tubing to be formed
Times；
(3) position for suitably adjusting tubing 8 to be formed makes itself and the concentric placement of form-wound coil 9；
(4) it connects Helmholtz coil system 1 and forms background magnetic field 10；
(5) power on system to charge to capacitor group 7, when voltage reaches setting value 0-30KV, stop charging；
Closure switch 5 form discharge loop；
Then, as shown in Fig. 2, generating pulse current in form-wound coil 9, to form pulsed magnetic field, while being determined by the right hand
Then, vortex is induced on tubing 8 to be formed, and vortex will generate in pulsed magnetic field far from shaped wire known to left hand rule
The Lorentz force for enclosing 9 directions, when the Lorentz force that vortex generates is more than the radial yield limit of tubing 8 to be formed, electromagnetic force
Make tubing 8 to be formed towards the direction high-speed deformation far from form-wound coil 9.
During this, kinetic energy, plastic deformation ability and the thermal energy lost that electric energy is converted on tubing to be formed, coil
After the electromagnetic force of generation, tubing 8 to be formed enters background magnetic field 10 by effect of inertia；
(6) deformed pipe material 8 for entering background magnetic field 10 cuts the magnetic induction line generation induced current of background magnetic field 10, to
It is formed in background magnetic field 10 and moves the opposite electromagnetic force in direction, hindered it further to deform, that is, electromagnetic damping occurs
Phenomenon；
Since the deformation velocity of 8 each point of tubing to be formed is different, the time into background magnetic field 10 and cutting magnetic induction line
Speed is also different, from electromagnetic force formula F=BLv：On tubing different plastically deforming areas can be formed in background magnetic field with
Its corresponding electromagnetic resistance field, it is bigger that the more violent region of plastic deformation is formed by resistance.To formed " middle part resistance is big,
Two end resistances are small " uneven resistance field；
Because the resistance field is caused by uneven plastic deformation, the distribution of all this uneven resistance fields with wait for
The uneven Plastic Flow field that forming tube 8 is generated by the effect of " kelvin effect " and " end effect " is agreed with completely, therefore
The plasticity imperfect flow of non-uniform resistance field improves tubing 8 to be formed phase after forming, final to obtain Plastic Flow equal
Qualified tube expansion part even, without local reduction or spalling.
Form-wound coil 9 is the part for providing power in the present invention, and form-wound coil 9 is using close around multiturn toroidal winding knot
Structure, and the size according to tubing 8 to be formed is designed, which, which can generate prodigious radial load, keeps pipe 8 to be formed complete
At bulging, and the coil can bear larger forming reaction force, possess good service life.
The deformation process of tubing 8 to be formed is as shown in Fig. 3 a-3e.The original state of tube bulge is as shown in Figure 3a, in figure
Tubing 8 to be formed and the concentric placement of form-wound coil 9.After connecting switch, as shown in Figure 3b, pipe 8 to be formed obtains prodigious dynamic
Can, it takes the lead in deforming into background magnetic field 10 in the central region of inertia force effect down tube material 8.Fig. 3 c and Fig. 3 d are high-speed deformation
Deformation process of the tubing 8 in background magnetic field takes the lead in cutting background magnetic field 10 into the high-speed deformation region of background magnetic field 10
Magnetic induction line forms corresponding resistance field, that is, " electromagnetic damping " phenomenon occurs.It is formed by uneven resistance field and hinders pipe to be formed
The phase uneven Plastic Flow accordingly after forming of material 8.Tubing 8 through electromagnetic pulse effect and background magnetic field effect after material at
Shape schematic diagram is as shown in Figure 3 e, it is seen that be finally obtained Plastic Flow uniformly, the qualified tube expansion part without local reduction or spalling.
To sum up, as shown in Figure 1, in the present invention, background magnetic field line of magnetic induction direction from bottom to top, the tubing of high-speed deformation by
The background magnetic field line of magnetic induction is cut from inside to outside, by the right-hand rule it is found that generating corresponding induced current (clockwise direction), the sense
Induced current in background magnetic field by left hand rule it is found that form electromagnetic force F from outside to inside, that is, electromagnetic damping phenomenon occurs.It should
Electromagnetic force F is with tubing initial deformation direction on the contrary, to hinder the follow-up unconstrained reformulation of tubing；Due to the change of each point on tubing
Shape degree is uneven, different into the time of background magnetic field and the speed of cutting magnetic induction line, by electromagnetic force formula F=BLv
Known to：Different plastic area can form the electromagnetic damping field of force corresponding thereto in background magnetic field, and plastic deformation is more violent
To be formed by resistance bigger in region.To which the non-uniform plastically deforming area of Plastic Flow is formed by unevenness at it on tubing
Under the effect of contraction of even resistance field, it is final obtain Plastic Flow uniformly, the qualified tube expansion part without local reduction or spalling.
The above is presently preferred embodiments of the present invention, but the present invention should not be limited to the embodiment and attached drawing institute
Disclosure.So every do not depart from the lower equivalent or modification completed of spirit disclosed in this invention, guarantor of the present invention is both fallen within
The range of shield.
Claims (10)
1. a kind of tubing is without mould electromagnetic forming method, which is characterized in that include the following steps：
(1) form-wound coil is fixed, both ends connect pulse discharge circuit；
(2) tubing that will be shaped is set in outside form-wound coil, and adjustment tubing position is allowed to be distributed with form-wound coil coaxial line；
(3) power supply for connecting background magnetic field generation device generates stable, uniform background magnetic field；It adjusts background magnetic field and generates dress
It sets, background magnetic field is made to only occur on the outside of tubing；
(4) make pulse discharge circuit makes electric current pass through form-wound coil, generates pulsed magnetic field；
The vortex opposite with pulsed magnetic field direction will be induced on tubing to be formed, the effect of the Lorentz force caused by vortex
Under, high-speed deformation occurs for tubing, into background magnetic field area, generates dissection to the background magnetic field magnetic induction line in the area, generates phase
To generate the electromagnetic force opposite with cut direction under background magnetic field effect electromagnetic damping occurs for the induced current answered existing
As the uneven Plastic Flow that tubing is generated by " end effect " and " kelvin effect " being hindered, to realize electromagnetism without mould
Forming.
2. manufacturing process described in claim 1, which is characterized in that the background magnetic field is produced using Helmholtz coil system
It is raw.
3. a kind of no mould electromagnetic forming device, which is characterized in that including Helmholtz coil system, supporting rod is upper and lower to support
Plate, drive rod, pulse discharge circuit and form-wound coil；Wherein：
The Helmholtz coil system includes several to upper and lower symmetrically arranged coil, and wherein lower coil is fixed on lower branch
On fagging, location arrangements of the lower coil on the lower supporting plate are in the outside of the excircle of the form-wound coil, upper lines
Circle is fixed on upper backup pad, the excircle of location arrangements of the upper coil on the upper backup pad in the form-wound coil
Outside enables the background magnetic field that Helmholtz coil system is formed to cover the deformed region of tubing, upper and lower support plate and each thereon
To the parameter of coil and it is distributed symmetrically；
The supporting rod is more adjustable rods, is located between upper and lower support plate, for adjusting between upper and lower support plate
Spacing, be formed by background magnetic field intensity so as to adjust Helmholtz coil system, make axis direction magnetic between upper and lower coil
Field distribution is uniform；
The drive rod is respectively set in upper and lower support plate, and among support plate；The form-wound coil is located above and below
Between drive rod；The driving pole length is adjustable, the position for fixing form-wound coil；
The form-wound coil is for generating pulsed magnetic field, making tubing that high-speed deformation occur；
The pulse discharge circuit includes switch, resistance and the capacitor group of concatenation, its two terminations pulse of the form-wound coil is put
Circuit constitutes a pulse discharge loop, for generating pulsed magnetic field with it.
4. building mortion according to claim 3, which is characterized in that the Helmholtz coil system can be by adjusting it
In relative position between each pair of coil, to adjust the distributed areas of background magnetic field.
5. according to the building mortion of claim 3 or 4, which is characterized in that each coil of the Helmholtz coil system 1 hangs down
Histogram is set as 1-1.3 times of tubing axial length to be formed to spacing.
6. according to the building mortion of claim 3 or 4, which is characterized in that the form-wound coil is close around multiturn spiral pipeline
Coil structures, and carry out loose fit design according to the size of tubing to be formed.
7. according to the building mortion of claim 3 or 4, which is characterized in that the tubing is the preferable tubing of conductivity, including
Aluminium-alloy pipe and copper alloy tube.
8. according to the building mortion of claim 3 or 4, which is characterized in that the form-wound coil is rectangular section, and coil is radial
Sectional area 10-25mm2, material is copper alloy, and multiturn is close around structure.
9. according to the building mortion of claim 3 or 4, which is characterized in that the tubing top is equipped with coil to be not more than
The spacing of 5mm so that blank end can radially Free Transform, to obtain uniform tube expansion part.
10. according to a kind of electromagnetic casting method of the building mortion of claim 3 or 4, which is characterized in that including following
Step：
(1) forming tube is intended to be sleeved on outside form-wound coil；
(2) supporting rod is adjusted, so as to adjust each spacing to upper lower coil in Helmholtz coil system, so that after coil is powered
The background magnetic field of formation meets the required intensity of forming；
(3) drive rod is adjusted, to fix the position of form-wound coil；
(4) position for adjusting tubing to be formed, makes itself and the concentric placement of form-wound coil；
(5) Helmholtz coil system is connected, background magnetic field is formed；
(6) make pulse discharge circuit switchs, and capacitor group starts to discharge, and pulse current is generated in form-wound coil, to shape
At pulsed magnetic field, while according to the right-hand rule, the vortex opposite with pulsed magnetic field direction is induced on tubing to be formed, be vortexed
Under the action of generated Lorentz force, which occurs high-speed deformation, into background magnetic field area, is generated to the magnetic induction line in the area
Dissection；
The magnetic induction line of the tubing cutting background magnetic field of high-speed deformation, generates corresponding induced current, to be acted in background magnetic field
Lower generation and cut direction opposing electromagnetic power, that is, occur electromagnetic damping phenomenon；The electromagnetic force of generation hinders tubing because " imitating end
Answer " and " kelvin effect " and generate uneven Plastic Flow, to realize electromagnetic casting；" end effect " refers to magnetic
Field is the phenomenon that pipe end disperses, magnetic field intensity is caused to reduce；" kelvin effect " refers to induced field in tubing table
The phenomenon that radially magnetic field intensity is gradually reduced in face.
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| CN113182446B (en) * | 2021-05-13 | 2023-05-16 | 中南大学 | Current-assisted electromagnetic forming device and forming method for metal pipe fitting |
| CN114632862B (en) * | 2022-03-17 | 2023-10-31 | 武汉理工大学 | Electromagnetic forming system and method based on axial double coils |
| CN114733954B (en) * | 2022-04-14 | 2023-04-07 | 厦门大学 | Adjustable high-frequency vibration assisted electromagnetic forming device and method |
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| BE664918A (en) * | 1964-06-11 | 1900-01-01 | ||
| JP3454570B2 (en) * | 1994-06-29 | 2003-10-06 | 本田技研工業株式会社 | Electromagnetic molding equipment |
| JPH09166111A (en) * | 1995-12-13 | 1997-06-24 | Showa Alum Corp | Connecting method of metallic hollow members with each other |
| JP5026390B2 (en) * | 2008-10-22 | 2012-09-12 | 株式会社神戸製鋼所 | Electromagnetic forming method |
| CN203459492U (en) * | 2013-08-05 | 2014-03-05 | 三峡大学 | Radial-axial two-way loading type metal pipe fitting electromagnetic forming device |
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