CN206824460U - A kind of electromagnetic pulse forming device of sheet metal - Google Patents
A kind of electromagnetic pulse forming device of sheet metal Download PDFInfo
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- CN206824460U CN206824460U CN201720718551.0U CN201720718551U CN206824460U CN 206824460 U CN206824460 U CN 206824460U CN 201720718551 U CN201720718551 U CN 201720718551U CN 206824460 U CN206824460 U CN 206824460U
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Abstract
The utility model discloses a kind of electromagnetic pulse forming device of sheet metal, including form-wound coil, blank holder, press device, shaping dies, the first power module and second source module, both ends of the both ends of form-wound coil respectively with the first power module are connected, and the first power module is used to provide electric current for form-wound coil；Shaped region produces electromagnetic force in metal sheet after galvanization in form-wound coil；Second source module is used for the both ends for being connected to metal sheet, and electric current is provided for metal sheet；Shaping dies plays a part of constraining component shaping shape between coil and workpiece；Press device, which is used for realization, prevents form-wound coil from rebounding, and make it that workpiece flange region is wrinkle resistant for applying pressure to blank holder.Under the pattern for being loaded directly into electric current, the size of current in metal sheet can significantly get a promotion the utility model, and size of current influenceed by resistivity it is smaller, can effectively solve the problems, such as low conductivity material inductive loop it is small and cause plastic force deficiency.
Description
Technical field
The utility model belongs to metal material Plastic Forming field, more particularly, to a kind of electromagnetism arteries and veins of sheet metal
Punching forming device.
Background technology
Lightweight is that the fields such as Aero-Space, automobile improve delivery device utmost carrying ability ability, realize the weight of energy-saving and emission-reduction
Want technological means.High-performance aluminium alloy, titanium alloy, magnesium alloy etc. have then turned into modern aerospace equipment and have improved structural bearing energy
The preferred material of the power limit.
However, under existing quasistatic forming technology, the Plastic Forming performance of above-mentioned light-alloy is poor, is easy to resilience occur
And fracture phenomena, and then directly affect the quality of formation of parts.Electromagnetic pulse forming technology is to metal using pulse-electromagnetic force
Blank carries out a kind of high-duty of plastic working, high-speed special process method, due to material constitutive under the inertia effect, high-speed
The factors such as the electro plasticity effect during relation and electro-magnetic forming cause the forming property of metal material to be improved (shaping pole
Limit improves, resilience is small, suppresses corrugation etc.), additionally there is single mold, without transmission medium, and then be considered as real
The important method of the light material processing such as existing aluminium alloy, magnesium alloy, titanium alloy.Therefore, electro-magnetic forming has been used for various metals
Plate pipe part shapes.
But traditional electromagnetic pulse forming technique is by being passed through pulse current in form-wound coil, in metal sheet region
The magnetic field changed over time is produced, while the vortex of a resistance changes of magnetic field can be sensed in metal sheet, magnetic field and vortex
Interphase interaction, moment produce a huge electromagnetic force, are plastically deformed metal sheet.Its existing subject matter
Have：
(1) electric current required for component shaping electromagnetic force is due to that electromagnetic induction is acted on and inducted inside metal material
Vortex, its size is directly related with the electrical conductivity of metal material, applies in general to that aluminium, copper coin material are this kind of to have high conductivity
Material forming, but for the metal material (such as titanium alloy, steel) of poorly conductive, existing technique can not provide this kind of material
Electro-magnetic forming power necessary to deformation.
(2) eddy current in workpiece and direction are directly related with profiled magnetic field distribution and variation characteristic caused by coil,
The two with very strong relevance because independently to regulate and control, and correspondingly, the distribution character of electro-magnetic forming power is difficult to basis
It is actually needed and is adjusted.Shaped as existing forming technology usually produces repulsive force between workpiece and coil to realize,
Relatively it is difficult to for attraction shaping.
Above mentioned problem causes the crystallized ability of electromagnetic forming technique and application to be limited.
Utility model content
The defects of for prior art, the purpose of this utility model are to provide a kind of electromagnetic pulse forming of sheet metal
Device, it is intended to solve the problems, such as to cause plastic force deficiency using low conductivity material inductive loop is small in the prior art.
The utility model provides a kind of electromagnetic pulse forming device of sheet metal, including：Form-wound coil, blank holder,
Press device, shaping dies, the first power module and second source module, the both ends of form-wound coil respectively with the first power module
Both ends connection, the first power module is used to for form-wound coil provide electric current；In metal sheet after galvanization in form-wound coil
Middle shaped region produces electromagnetic force；Second source module is used for the both ends for being connected to metal sheet, and electric current is provided for metal sheet；
Shaping dies mainly plays a part of constraining component shaping shape between coil and workpiece；Press device is anti-for realizing
Only form-wound coil rebounds, and make it that workpiece flange region is wrinkle resistant for applying pressure to blank holder.
Further, the first power module includes：Charger, capacitor bank, switch and continuous current circuit, the capacitor
One end of group and one end of form-wound coil connect, and the other end of the capacitor bank passes through the switch and the form-wound coil
The other end connects, and the continuous current circuit is in parallel with the form-wound coil, and the charger is in parallel with the form-wound coil；Charger
For being charged to capacitor；The capacitor bank is used to store electric energy；It is described to switch cut-offfing for control circuit, closure
When by the electric energy stored in capacitor discharge, electric current is produced in coil；The continuous current circuit is used to produce in metal sheet
The electric current of one non-oscillatory waveform, to ensure that the suffered electromagnetism force direction in forming process in workpiece maintains not always
Become.
Further, continuous current circuit includes：The fly-wheel diode and continued flow resistance being connected in parallel with each other.
Further, second source module is identical with the first power module structure.
Further, the structure of shaping dies carries out matching setting according to the actual requirements, when carrying out free bulge, into
Shape mould is cylindricality cavity configuration；When carrying out non-free bulging, the shaping dies is the cavity plate knot consistent with shaping form
Structure.
Further, the material of shaping dies is non-conducting material.
Further, blank holder is column construction, and material is non-conducting material.
The course of work of the electromagnetic pulse forming device of sheet metal provided by the utility model is as follows：
S1 passes through blank holder when metal sheet to be formed is placed between shaping dies and form-wound coil using press device
Pressure wrinkles to prevent metal sheet flange region；
S2 provides electric current by the first power module to form-wound coil, and the form-wound coil after energization produces in metal sheet region
Raw pulsed magnetic field；
Electric current is provided to metal sheet so that pulse current is produced in metal sheet by second source module；The arteries and veins
Rush electric current and produce the electromagnetic force for being used to drive metal sheet that high-speed deformation occurs with pulsed magnetic field interaction；
S3 is deformed upon by electromagnetic force metal sheet to be formed.
Further, in form-wound coil there is any component direction and the sense of current in metal sheet in caused magnetic field
Vertically.
Further, the current waveform in the metal sheet and the form-wound coil is non-oscillatory formula waveform.
Further, form-wound coil can be made up of one or more rectangular cross-section or circular coil；Pass through
Multiple coils produce in a plurality of directions to be produced one in shaped region superposition after the collective effect of magnetic field and closes magnetic field.
The utility model has the advantages that：
(1) in the utility model using be loaded directly into by the way of electric current metal sheet to replace traditional induction type whirlpool
Stream.It is loaded directly under pattern, the size of current in metal sheet can significantly be got a promotion, and size of current is influenceed by resistivity
It is smaller, can effectively solve the problems, such as that low conductivity material inductive loop is small and causes plastic force deficiency.Therefore this method is led to height
Electric rate (copper, aluminium alloy etc.) and lower conductivity metallic (magnesium alloy, titanium alloy, steel plate etc.) material forming are effective；
(2) the main electric current and shaped wire by being loaded on metal sheet of the electromagnetic force in the utility model needed for metal forming
In circle caused magnetic field come determine (electromagnetic body force f size and Orientation depend on current phasor J and magnetic vector B vector
Product, f=J × B).And metal sheet electric current and the electric current in the form-wound coil needed for generation profiled magnetic field are independent by two sets respectively
Power-supply system power, therefore energy size, discharge time and electric capacity amplitude for adjusting two power-supply systems etc. can be passed through and changed
This two classes electric current is in size, direction, pulsewidth and electric discharge sequential etc., and so as to electromagnetism force direction caused by final, size is easily adjustable
Controllable, formation system is flexible strong.
Brief description of the drawings
Fig. 1 is a kind of Electromagnetic bulging schematic diagram for metal sheet according to the utility model first embodiment；
Fig. 2 (a) is the loop construction and current diagram according to the utility model first embodiment；
Fig. 2 (b) is the metal sheet structure and current diagram according to the utility model first embodiment；
Fig. 2 (c) is magnetic field, electric current and stress signal in the metal sheet according to the utility model first embodiment
Figure；
Fig. 3 (a) is the Eddy Distribution schematic diagram in traditional electro-magnetic forming workpiece；
Fig. 3 (b) is the CURRENT DISTRIBUTION schematic diagram in the workpiece according to the utility model first embodiment；
Fig. 4 is the discharge current waveform schematic diagram according to a kind of coil and workpiece of the utility model first embodiment；
Fig. 5 (a) is the metal sheet structure and current diagram according to the utility model second embodiment；
Fig. 5 (b) is the loop construction schematic diagram according to the utility model second embodiment.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
The utility model carries out being loaded directly into pulse current to sheet metal, without by sensing form-wound coil magnetic field
Change and produce vortex.Caused pulsed magnetic field can produce flash with moment in the pulse current and form-wound coil that are loaded
Electromagnetic force, when magnetic pressure reaches the yield strength of material, high speed plastic deformation is occurred into for driving metal sheet.
Realizing the device of electromagnetic forming method includes：Form-wound coil 1, metal sheet 3, blank holder 6, press device 7, shaping
Mould 5, the first power module 2 and second source module 4；
Press device 7, which is used for realization, prevents form-wound coil 1 from rebounding, and causes workpiece method for applying pressure to blank holder 6
Blue region is wrinkle resistant；
The both ends of form-wound coil 1 are connected with the both ends of the first power module 2, and the first power module 2 is used for form-wound coil 1
Electric current is provided；Shaped region produces electromagnetic force in workpiece 3 after galvanization in form-wound coil 1.
The structure of shaping dies 5 can be set according to the actual requirements, general using as shown in Figure 1 simple during free bulge
Cylindricality cavity structure, during non-free bulging, the cavity die structure consistent with shaping form is used accordingly.Mold materials can be
Non-conducting material such as epoxy plate etc., also can be conventional poor conductor material such as mould steel etc..
Blank holder 6 is column construction, can use non-conducting material such as epoxy plate etc., also can be conventional poor conductor material
Such as mould steel.
First power module 2 includes：Charger, capacitor bank, switch and continuous current circuit, one end of capacitor bank and shaping
One end connection of coil 1, the other end of capacitor bank are connected by switching with the other end of form-wound coil 1, continuous current circuit and into
Shape coil 1 is in parallel, and charger is in parallel with form-wound coil 1.Charger is used to charge to capacitor；Capacitor bank is used to store
Electric energy；Switch cut-offfing for control circuit, the electric energy stored in capacitor is discharged during closure, electric current is produced in coil；
Continuous current circuit is used for the electric current that a non-oscillatory waveform is produced in plate, suffered by ensuring in forming process in workpiece
Electromagnetism force direction remain unchanged always, it is made up of fly-wheel diode and continued flow resistance.Continuous current circuit is used to adjust current wave
The principle of shape is：When circuit works at the beginning, backward voltage is born at fly-wheel diode both ends, is closed, and loop is not
Conducting；When capacitor voltage at both ends starts reverse, fly-wheel diode is begun to turn on, and electric current can flow through continuous current circuit, now electric
Flowing waveform will be relevant with continued flow resistance.In general, in order to avoid there is waveform, continued flow resistance do not answer it is excessive also should not mistake
It is small.
Second source module 4 is connected to the both ends of metal sheet 3, for providing electric current for metal sheet 3.Second source mould
The concrete structure of block 4 is identical with the structure of the first power module 2, but function is different, and the first power module is that form-wound coil 1 supplies
Electricity, produces electric current in form-wound coil 1, and then larger magnetic field is produced in the region of metal sheet 3, and second source module be for
Metal sheet 3 is powered, and larger electric current is produced in metal sheet.In order to realize the independence in electric current and magnetic field in metal sheet 3
Regulation and control, the first power module connects with second source module without circuit, is two independent current sources.
The electromagnetic pulse forming method for the sheet metal that the utility model embodiment provides specifically includes following step：
Step 1：Metal sheet to be formed is placed between shaping dies and form-wound coil, and passed through using press device
Blank holder presses, and is wrinkled to prevent workpiece flange region；
Step 2：First power module includes：Charger, capacitor bank, switch and continuous current circuit, charger are used for electricity
Container group is charged, and continuous current circuit passes through two of switch, wire and form-wound coil for adjusting current waveform, capacitor bank
Outlet lead nose is connected, and form-wound coil can be discharged by closure switch, and pulsed magnetic field is produced in metal sheet region；
Step 3：Second source module includes being made up of charger, capacitor bank, switch and continuous current circuit, charger
For being charged to capacitor bank, continuous current circuit is used to adjust current waveform, and capacitor bank passes through switch, wire and metallic plate
The two-port of part is connected, and metal sheet can be discharged by closure switch, and pulse current, electricity are directly produced in metal sheet
Stream produces electromagnetic force driving workpiece with the magnetic field interaction in step 2 and high-speed deformation occurs.
Step 4：Repeat step two, three can repeatedly be shaped to metal sheet.
In the utility model embodiment, above-mentioned first and second power module is respectively that form-wound coil and metal sheet enter
Row electric discharge, the two respective discharge parameter (voltage, pulsewidth, triggered time) Independent adjustable, such as by changing two sets of power modules
The capacitance of middle capacitor bank can adjust discharge current pulsewidth, by setting the different triggered times can two sets of power modules
Electric discharge sequential to change the two etc..
In the utility model embodiment, magnetic field caused by form-wound coil is present in any component direction and metal sheet
The sense of current it is vertical.
In the utility model embodiment, the electric current in metal sheet and form-wound coil is non-oscillatory formula waveform, and direction is not
Change, can be achieved by choosing suitable continuous current circuit parameter (size of adjustment continued flow resistance).
In the utility model embodiment, form-wound coil can be by one or more rectangular cross-section or circular coil
Composition.Magnetic field is produced in a plurality of directions by multiple coils, and a conjunction magnetic is produced so as to which collective effect can be superimposed in shaped region
, the magnetic field size and direction are together decided on by each coil institute-caused magnetic field size and Orientation, by adjusting each coil
Magnetic field parameter, it can be achieved to close the size in magnetic field and direction be adjustable.
In the utility model embodiment, the cross sectional shape of metal sheet can be any regular.
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.
The utility model first embodiment provides a kind of Electromagnetic bulging method for metal sheet, as shown in figure 1, bag
Include following steps：
(1) form-wound coil 1 is fixed on press device 7.Shown in the structural representation of form-wound coil 1 such as Fig. 2 (a), it is
One square coil, it can be produced in metal sheet shaped region along the more uniform magnetic field in y directions, wherein y directions are coil
Direction where roll, it is vertical with the sense of current (x directions) that metal sheet is passed through.Compared with traditional electro-magnetic forming, this into
One significant difference of shape mode the electric current in workpiece flow direction, as shown in Figure 3.In traditional electro-magnetic forming, metal sheet 20
In caused electric current be ring vortex 21, Fig. 3 (a) is seen, and in the scheme mentioned by the utility model, in metal sheet 20
Caused electric current is along horizontal direction.Correspondingly, to be produced in metal sheet 20 along the inside electromagnetic force of paper, two kinds
In the case of needed for externally-applied magnetic field direction it is also different, the former need for radially, the latter is then vertical direction.
(2) metal sheet 3 is placed between nonmetallic shaping dies 5 and form-wound coil 1, and passed through using press device 7
Blank holder 6 presses, and is wrinkled to prevent workpiece flange region.
(3) form-wound coil 1 is accessed to first be made up of charger, capacitor 2-1, switch 2-2 and fly-wheel diode 2-3
Power module 2, wherein fly-wheel diode 2-3 main purpose be in order to produce the electric current of a non-oscillatory waveform in plate,
To ensure that the suffered electromagnetism force direction in forming process in workpiece remains unchanged always.
(4) metal sheet 3 is accessed to second be made up of charger, capacitor 4-1, switch 4-2 and fly-wheel diode 4-3
Power module 4, wherein fly-wheel diode 4-3 main purpose be in order to produce the electric current of a non-oscillatory waveform in coil,
To ensure that the suffered electromagnetism force direction in forming process in workpiece remains unchanged always.
(5) first power modules 2 and second source module 4 are discharged form-wound coil and metal sheet respectively, in gold
Belong to profiled magnetic field and electric current of the plate shaped region 8 respectively required for generation plastic force, it produces schematic diagram such as Fig. 2 of electromagnetic force
It is shown.Electric current I in form-wound coil 1cThe magnetic field along y directions can be produced in coil side, as shown in Fig. 2 (a)；Metal sheet
The exciting current I being passed through in 3wDirection along x directions, Fig. 2 (b)；The magnetic field 10 in y directions and the electric current 9 in x directions produce towards
The electromagnetic force 11 in z directions, as shown in Fig. 2 (c).
(6) metal sheet 3 is driven plate that high-speed deformation occurs towards die region by the flash electromagnetic force in z directions.
(7) the utility model is because electric current is directly to be loaded into by power supply-control system on metal sheet, therefore its material
Can be not only high conductivity material (such as copper, aluminium alloy) or low-conductivity material (titanium alloy, steel board) etc.；
The pulsewidth of exciting current, electric discharge sequential and direction can be adjusted and optimize according to being actually needed in profiled magnetic field and workpiece, body
Now：(a) when needing to produce aspiration-type electromagnetic force in coil and workpiece, can be passed through within the workpiece and electricity reverse Fig. 2 (b)
Stream, the force direction being now subject in workpiece are opposite with Fig. 2 (c).(b) when metal sheet is high conductivity material, to keep away
Exempt from caused alternating magnetic field in coil and induce larger vortex within the workpiece, can be in form-wound coil so as to influence forming effect
In be passed through long pulsewidth electric current (pulsewidth ms levels), play the effect of an approximation steady state background magnetic field, now can form-wound coil electricity
Stream reaches peak value time around and discharged, and current waveform and discharging time schematic diagram are as shown in Figure 4.(c) when metal sheet is
During low-conductivity material, the electric current in coil and metal sheet can synchronously change, also can be with situation in (b) on the contrary, in metallic plate
Long pulsewidth electric current is passed through in part, short pulse duration electric current is produced in form-wound coil, further can now be reduced between workpiece and coil
Electromagnetic coupled acts on, and reduces because of influence of the alternating magnetic field caused by workpiece to electric current in form-wound coil.
The utility model second embodiment provides a kind of high-rate forming method for profiled metal component；This embodiment party
Difference of the formula from embodiment one is that hardware shape described here and corresponding mold shape section can be
Arbitrary shape (symmetrical section such as unconventional circular or rectangle), as shown in Fig. 5 (a).In traditional electro-magnetic forming, in workpiece
Induced-current (vortex) path generally is the circular loop of a closure, and in the utility model embodiment, due to workpiece
Middle electric current is loaded directly into, therefore it can flow along the shape of workpiece conductor, and its path becomes as Components Shape changes
Change, precondition is provided on any shaped metal component so as to be applied for it., can be when discharging hardware
Component inside produces electric current, and the sense of current flows along Components Shape, the class S curve hardware 12 presented such as Fig. 5 (a).
Now electric current IwThere are x and the current weights of y two, in order to carry out valid shaping and regulation and control to the component, correspondingly need y and x points
The magnetic field of amount, therefore take y directional coils 13 as shown in Fig. 5 (b) and the collective effect of x directional coils 14 to be produced in shaped region 15
Size, direction are adjustable, and (big I realizes that direction can be by adjusting two by adjusting the coil current size in both direction
The reach the standard grade ratio of loop current of direction is realized) magnetic field, it is flexibly controllable so as to be produced accordingly with the function of current in component
Electromagnetic force, workpiece stress is promoted to be plastically deformed.
As it will be easily appreciated by one skilled in the art that preferred embodiment of the present utility model is the foregoing is only, not
To limit the utility model, any modification of all made within spirit of the present utility model and principle, equivalent substitution and change
Enter, should be included within the scope of protection of the utility model.
Claims (6)
- A kind of 1. electromagnetic pulse forming device of sheet metal, it is characterised in that including：Form-wound coil (1), blank holder (6), pressure Power equipment (7), shaping dies (5), the first power module (2) and second source module (4),Both ends of the both ends of the form-wound coil (1) respectively with first power module (2) are connected, first power module (2) it is used to provide electric current for the form-wound coil (1)；After galvanization in the form-wound coil (1) in metal sheet (3) into Shape region produces electromagnetic force；The second source module (4) is used for the both ends for being connected to metal sheet (3), and electric current is provided for the metal sheet (3)；The shaping dies (5) is located between form-wound coil (1) and metal sheet (3), for constraining component shaping shape；The press device (7), which is used for realization, prevents the form-wound coil (1) from rebounding, and for applying to the blank holder (6) Pressure make it that workpiece flange region is wrinkle resistant.
- 2. electromagnetic pulse forming device as claimed in claim 1, it is characterised in that first power module (2) includes：Fill Motor, capacitor bank, switch and continuous current circuit,One end of the capacitor bank is connected with the one end of form-wound coil (1), and the other end of the capacitor bank is opened by described Pass is connected with the other end of the form-wound coil (1), and the continuous current circuit is in parallel with the form-wound coil (1), the charger It is in parallel with the form-wound coil (1)；The charger is used to charge to capacitor；The capacitor bank is used to store electric energy；It is described to switch for controlling Circuit cut-offs, and discharges the electric energy stored in capacitor during closure, electric current is produced in coil；The continuous current circuit is used for The electric current of a non-oscillatory waveform is produced in metal sheet, to ensure the suffered electromagnetic force side in forming process in workpiece To remaining unchanged always.
- 3. electromagnetic pulse forming device as claimed in claim 2, it is characterised in that the second source module (4) with it is described First power module (2) structure is identical.
- 4. the electromagnetic pulse forming device as described in claim any one of 1-3, it is characterised in that the shaping dies (5) Structure carries out matching setting according to the actual requirements, and when carrying out free bulge, the shaping dies (5) is cylindricality cavity configuration；When When carrying out non-free bulging, the shaping dies (5) is the cavity die structure consistent with shaping form.
- 5. electromagnetic pulse forming device as claimed in claim 4, it is characterised in that the material of the shaping dies (5) is non- Conductive material.
- 6. electromagnetic pulse forming device as claimed in claim 1, it is characterised in that the blank holder (6) is column construction, material Expect for non-conducting material.
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| CN201720718551.0U CN206824460U (en) | 2017-06-20 | 2017-06-20 | A kind of electromagnetic pulse forming device of sheet metal |
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| CN201720718551.0U CN206824460U (en) | 2017-06-20 | 2017-06-20 | A kind of electromagnetic pulse forming device of sheet metal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109175062A (en) * | 2018-07-10 | 2019-01-11 | 西安交通大学 | The electromagnetic pulse forming device and manufacturing process of crimping cable transition joint connecting tube |
| WO2019169944A1 (en) * | 2018-03-08 | 2019-09-12 | 上海交通大学 | High-frequency continuous electromagnetic forming device for plate forming |
-
2017
- 2017-06-20 CN CN201720718551.0U patent/CN206824460U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019169944A1 (en) * | 2018-03-08 | 2019-09-12 | 上海交通大学 | High-frequency continuous electromagnetic forming device for plate forming |
| US11433448B2 (en) | 2018-03-08 | 2022-09-06 | Shanghai Jiao Tong University | High-frequency continuous electromagnetic forming device for plate formation |
| CN109175062A (en) * | 2018-07-10 | 2019-01-11 | 西安交通大学 | The electromagnetic pulse forming device and manufacturing process of crimping cable transition joint connecting tube |
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