CN105170768A - Device and control method for using electromagnetic attractive force caused by sudden current change to form metal plate - Google Patents
Device and control method for using electromagnetic attractive force caused by sudden current change to form metal plate Download PDFInfo
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- CN105170768A CN105170768A CN201510669453.8A CN201510669453A CN105170768A CN 105170768 A CN105170768 A CN 105170768A CN 201510669453 A CN201510669453 A CN 201510669453A CN 105170768 A CN105170768 A CN 105170768A
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Abstract
The invention relates to a device and a control method for using electromagnetic attractive force caused by sudden current changes to form a metal plate. The device comprises an execution part and a power system. The execution part comprises working coils, a die and the metal plate. The die is arranged between the working coils and the metal plate. The working coils and the die are fixedly connected to serve as an actuator. The power system comprises a control system, an energy storage system, a charging loop and a discharging loop. The charging loop and the discharging loop are connected to the two ends of the energy storage system respectively in parallel. The control system is electrically connected with the charging loop and the discharging loop. The working coils are electrically connected with the discharging loop. According to the device and the control method, traditional electromagnetic forming repulsive force is converted into the attractive force, the working coils and the die can be combined into a whole, the cooperation difficulty is reduced, and the application range of an electromagnetic forming technique is enlarged in the aspect of the process.
Description
Technical field
The present invention relates to electro-magnetic forming field, particularly a kind of current break causes device and the control method of electromagnetic attraction form metal plate.
Background technology
Electro-magnetic forming is mainly used in the forming manufacturing technology of conductive material, that a kind of electric energy conversion that utilizes is for the method for magnetic field energy form metal plate, traditional electro-magnetic forming equipment often utilizes electromagnetic repulsive force, be the metal blank electromagnetic forming device of the document introduction of CN101406913A as China Patent Publication No., comprise coil, collection chinaware, workpiece and shaping dies.Coil outer assembling collection chinaware is placed in the side of workpiece, and the working face of collection chinaware active set magnetic is near workpiece.Shaping dies is then positioned at the opposite side of workpiece, passes through pulse high current during shaping in coil, produces repulsive force promotion workpiece and make workpiece be adjacent to mould to mold movement, with this Forming Workpiece between coil and workpiece.
But when running into Forming Workpiece and being the operating mode of closed area covering or covering, the shortcoming of described electro-magnetic forming equipment just presents, first the mould of electro-magnetic forming equipment and coil are placed in the both sides of workpiece respectively, make Whole Equipment be divided into two parts to be inconvenient to operate; Be shaped and need to need to dismantle covering in advance oppositely arranging mould, technique and operation all complicate.
Summary of the invention
In view of this, the object of the invention is to propose device and the control method that a kind of current break causes electromagnetic attraction form metal plate, simplify the operation.
Device of the present invention adopts following scheme to realize: a kind of current break causes the device of electromagnetic attraction form metal plate, comprises and performs part and power-supply system; Described enforcement division is divided and is comprised actuating coil, mould, metal blank, and described mould is arranged between described actuating coil and metal blank, and described actuating coil and mould are fixed together as actuator; Described power-supply system comprises control system, energy-storage system, charge circuit, discharge loop, described charge circuit is connected to described energy-storage system two ends, described discharge loop two ends are also connected to described energy-storage system two ends, described control system and described charge circuit, discharge loop are electrically connected, and described actuating coil and described discharge loop are electrically connected.
Preferably, power-supply system applies an electric current slowly risen in discharge loop, and suddenly change to during peaking at electric current, this function of current is in the coil of connecting with discharge loop, an induced field is produced around coil, and causing a generation inductive loop in metal blank consistent with the sense of current in coil, metal blank moves to actuating coil, and the restriction being subject to mould is configured as the shape of specifying.
Further, be sinusoidal decay electric current before being applied to the current break on described actuating coil, and meet I (t)=I
maxe
-βsin (ω t), described electric current declined to sudden change during peaking fast in 1/4 cycle, and before peak value, power frequency meets
peak value after-current frequency meets
wherein, I is electric current; E is natural number; β is attenuation coefficient; ω is angular frequency; T is the time, and f is frequency; μ
0for metal blank magnetic conductivity; γ is metal blank electrical conductivity; D is metal blank thickness.
Further, described actuating coil comprises the copper cash being wound in dish type and the insulating materials be coated on outside described copper cash, and the two ends of described copper cash are connected with discharge loop as two inputs of described actuating coil.
Further, described discharge loop comprises discharge switch K2 and current break module, and described discharge switch K2 and described actuating coil are cascaded, and the branch road comprising described discharge switch K2 and described actuating coil is connected to the two ends of energy-storage system; Described current break model calling is at described actuating coil two ends; Described discharge switch K2 and current break module and described control system are electrical connected.Wherein said current break module can the auxiliary capacitor C3 ' of rapid cut-off K switch 3 or mutually series connection and high-speed switch K3 '; Wherein said rapid cut-off K switch 3 is IGCT reverse-blocking tetrode thyristor with high-speed switch K3 '.Especially, described current break module can also be fuse cutout K3 ", now described current break module is connected with described actuating coil.Described fuse cutout K3 " comprise fuse and carry out open circuit.
Further, described charge circuit comprises the charge switch K1, rectification filtering module, inverter circuit module, high-frequency impulse voltage changing module and the final rectification module that are connected successively;
Wherein, described rectification filtering module comprises one first low frequency rectifier bridge, current-limiting resistance R2, filter capacitor C
zand current limiting switch K4, industrial-frequency alternating current is connected with the input of described first low frequency rectifier bridge by described charge switch K1, the negative output terminal of described first low frequency rectifier bridge is connected to one end of described current-limiting resistance R2, and the other end of described current-limiting resistance R2 is connected to described filter capacitor C
zone end, the positive output end of described first low frequency rectifier bridge is connected to described filter capacitor C
zthe other end, the two ends of described current limiting switch K4 are connected with the two ends of described current-limiting resistance R2 respectively, and wherein said charge switch K1 and described current limiting switch K4 is all electrical connected with described control system;
Wherein, described inverter circuit module comprises the first brachium pontis electric capacity C1, the second brachium pontis electric capacity C2, the first power protection module, the second power protection module, the first main power tube T
r1, the second main power tube T
r2, wherein the first brachium pontis electric capacity C1, the second brachium pontis electric capacity C2, the first main power tube T
r1and the second main power tube T
r2common formation half-bridge form, described first power protection module and the second power protection module are connected in parallel on the first main power tube T respectively
r1colelctor electrode and emitter stage and the second main power tube T
r2colelctor electrode and emitter stage; Wherein said first power protection module and the second power protection module include a resistance and an electric capacity of mutually series connection, and the two ends of described resistance are also connected to a power diode;
Wherein, described high-frequency impulse voltage changing module comprises armature winding, iron core and secondary windings, the two ends of described armature winding respectively with tie point and the second main power tube T of the first brachium pontis electric capacity C1 in described inverter circuit module and the second brachium pontis electric capacity C2
r2colelctor electrode, the two ends of described secondary windings are connected with described final rectification module;
Wherein, described final rectification module comprises the second low frequency rectifier bridge 641, two inputs of described second low frequency rectifier bridge are connected with the two ends of the secondary windings in described high-frequency impulse voltage changing module, and the positive output end of described second low frequency rectifier bridge and negative output terminal are connected in parallel to the two ends of described energy-storage system respectively.
Further, described energy-storage system comprises the capacitor of N number of parallel connection, the two ends of described capacitor as the two ends of described energy-storage system, wherein N be more than or equal to 1 positive integer.
Method of the present invention adopts following scheme to realize: a kind of control method causing the device of electromagnetic attraction form metal plate based on current break according to claim 4, specifically comprises the following steps:
Step S1: the top actuator comprising actuating coil and mould being placed in metal blank to be formed;
Step S2: the charge switch K1 controlled in described charge circuit by control system closes, discharge switch K2 in described discharge loop opens a way, rapid cut-off K switch 3 in current break module or high-speed switch K3 ' open a way, energy-storage system starts charging, and industrial-frequency alternating current completes to the charging of energy-storage system by the rectification filtering module in described charge circuit, inverter circuit module, high-frequency impulse voltage changing module, final rectification module successively; Automatic turn off charge switch K1 subsequently;
Step S3: closed discharge switch K2, energy-storage system and actuating coil, form complete RLC loop, by pulse heavy current that low frequency slowly rises in actuating coil;
Step S4: the current break module in described discharge loop is certain hour linkage work after discharge switch K2 is closed, oppositely apply high-frequency pulse heavy current fast, the current break in actuating coil declines fast; Wherein, described certain hour is the time that in actuating coil, electric current rises to maximum;
Step S5: the inductive loop in the magnetic field that electric current that the slow rising applied in actuating coil declines fast causes and metal blank, impel metal blank to move to actuating coil, the restriction being subject to mould is shaped.
Present invention also offers a kind of control method causing the device of electromagnetic attraction form metal plate based on current break mentioned above, specifically comprise the following steps:
Step S1: the top actuator comprising actuating coil and mould being placed in metal blank to be formed;
Step S2: the charge switch K1 controlled in described charge circuit by control system closes, discharge switch K2 in described discharge loop opens a way, fuse cutout K3 in current break module " do not arrive blowout current and normally work; energy-storage system starts charging, and industrial-frequency alternating current completes to the charging of energy-storage system by the rectification filtering module in described charge circuit, inverter circuit module, high-frequency impulse voltage changing module, final rectification module successively; Automatic turn off charge switch K1 subsequently;
Step S3: closed discharge switch K2, energy-storage system and actuating coil, form complete RLC loop, by pulse heavy current that low frequency slowly rises in actuating coil;
Step S4: the current break module in described discharge loop is certain hour linkage work after discharge switch K2 is closed, oppositely apply high-frequency pulse heavy current fast, the current break in actuating coil declines fast; Wherein, described certain hour is the time that in actuating coil, electric current rises to maximum;
Step S5: the inductive loop in the magnetic field that electric current that the slow rising applied in actuating coil declines fast causes and metal blank, impel metal blank to move to actuating coil, the restriction being subject to mould is shaped.
Preferably, the generation of electromagnetic attraction is based on following principle:
The parts relevant to Forming Theory are actuating coil, metal blank and mould.During work, its waveform of pulse heavy current applying a low frequency (slowly) in actuating coil meets formula (1) for sinusoidal decay waveform.Electromagnetic screen and workpiece can be permeated in the magnetic field requiring it to produce, and two faces of electromagnetic screen and workpiece all produce eddy current, and according to Kelvin effect, this just requires to be applied to single turn actuating coil frequency f
maxenough low, namely meet the requirement of formula (2).At this moment the di/dt flowing through coil current is very little, and the induced-current at this moment in metal blank is very little, so the magnetic field force that metal blank inner surface is subject to is very little, is far not enough to reach yield point.So no matter electric current I value is elevated to much metal blanks that also cannot make and deforms.At this moment the induced field of induced-current in metal blank and generation thereof can be ignored, in thinking that metal blank is inner and being in uniform magnetic field that coil produces around all the time.When electric current rises to certain value I
mtime, oppositely apply the pulse heavy current of high-frequency (fast), namely do not meet the requirement of formula (2).Make it with very large rate of change decay (even di/dt becomes negative value, and its absolute value is very large), at this moment also decay suddenly in magnetic field.
To produce induced-current according to the known metal blank inside of Lenz's law, its direction is consistent with the sense of current of decaying in coil, and induced-current produces induced field simultaneously.In metal blank inner space, magnetic direction that induced field and coil produce is cancelled out each other mutually on the contrary, identical and strengthen in metal blank space outerpace direction.Its result makes metal blank outer surface be subject to powerful magnetic field force---and attraction, if the stressed arrival yield point of metal blank, then occurs towards the distortion of coil direction.
I(t)＝I
maxe
-βsin(ωt)(1)
In formula: I is electric current; E is natural number; β is attenuation coefficient; ω is angular frequency; T is the time
In formula: f is frequency; μ
0for metal blank magnetic conductivity; γ is metal blank electrical conductivity; D is sheet thickness
Further, control system controls charge switch and closes, and during discharge switch open circuit, described charge circuit charges to energy-storage system, and after charging reaches the energy of specifying, charge circuit applies a feedback charge switch has been opened a way charging.Charge circuit outside connects low pressure power current, rectification filtering module, inverter circuit module, high-frequency impulse voltage changing module, final rectification module is comprised in charge circuit, industrial-frequency alternating current is through the conversion of rectifying and wave-filtering, inverter circuit, high-frequency pulse transformer, dc source required for formation is to energy-storage system, and energy-storage system is made up of large value capacitor.
Further, charge switch is opened a way, when discharge switch closes, in described discharge loop energy-storage system and actuating coil with protect inductance to be cascaded, and current break module be set in discharge loop controlled by control system equally.
Further, described current break module can be connected in parallel on actuating coil two ends, it is a rapid cut-off switch, certain hour after discharge switch is closed, electric current is to peaking, closed rapid cut-off switch, originally transfer to be passed through by current break module by the electric current of coil, coil current declines fast.
Compared with prior art, the present invention has following beneficial effect: it is attraction that the present invention transforms traditional electro-magnetic forming repulsive force, actuating coil and die assembly can be integrated, and reduces and coordinates difficulty, technique expands the scope of application of electromagnetic forming technique.
Accompanying drawing explanation
Fig. 1 is circuit and the frock position view of the removing charge circuit of the embodiment of the present invention 1.
Fig. 2 is the final molding schematic diagram of the embodiment of the present invention.
Fig. 3 is the schematic diagram of the charge circuit of the embodiment of the present invention.
Fig. 4 is mutation current waveform of the present invention.
Fig. 5 is circuit and the frock position view of the removing charge circuit of the embodiment of the present invention 2.
Fig. 6 is circuit and the frock position view of the removing charge circuit of the embodiment of the present invention 3.
[primary clustering symbol description]
In figure: 1 is actuating coil, 2 is mould, and 3 is metal blank, and 4 is control system, and 5 is energy-storage system, and 6 is charge circuit, and 7 is discharge loop; 11 is copper cash, and 12 is insulating materials; 61 is rectification filtering module, and 62 is inverter circuit module, and 63 is high-frequency impulse voltage changing module, and 64 is final rectification module, and 65 is charge switch; 71 is current break module; 611 is the first low frequency rectifier bridge, and 621 is the first power protection module, and 622 is the second power protection module, and 631 is armature winding, and 632 is iron core, and 633 is secondary windings, and 641 is the second low frequency rectifier bridge.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
Embodiment 1.
As shown in Figure 1, present embodiments provide the device that a kind of current break causes electromagnetic attraction form metal plate, comprise and perform part and power-supply system; Described enforcement division is divided and is comprised actuating coil 1, mould 2, metal blank 3, and described mould 2 is arranged between described actuating coil 1 and metal blank 3, and described actuating coil 1 is fixed together as actuator with mould 2; Described power-supply system comprises control system 4, energy-storage system 5, charge circuit 6, discharge loop 7, described charge circuit is connected to described energy-storage system two ends, described discharge loop two ends are also connected to described energy-storage system two ends, described control system 4 is electrically connected with described charge circuit 6, discharge loop 7, and described actuating coil and described discharge loop 7 are electrically connected.
Preferably, power-supply system applies an electric current slowly risen in discharge loop, and suddenly change to during peaking at electric current, this function of current is in the coil of connecting with discharge loop, an induced field is produced around coil, and causing a generation inductive loop in metal blank consistent with the sense of current in coil, metal blank moves to actuating coil, and the restriction being subject to mould is configured as the shape of specifying.
In the present embodiment, be sinusoidal decay electric current before being applied to the current break on described actuating coil, and meet I (t)=I
maxe
-βsin (ω t), described electric current declined to sudden change during peaking fast in 1/4 cycle, and before peak value, power frequency meets
peak value after-current frequency meets
wherein, I is electric current; E is natural number; β is attenuation coefficient; ω is angular frequency; T is the time, and f is frequency; μ
0for metal blank magnetic conductivity; γ is metal blank electrical conductivity; D is metal blank thickness.
In the present embodiment, described actuating coil comprises the copper cash 11 being wound in dish type and the insulating materials 12 be coated on outside described copper cash, ensures copper cash insulating properties between layers.The two ends of described copper cash are connected with discharge loop as two inputs of described actuating coil.
In the present embodiment, as shown in Figure 1, described discharge loop comprises protection inductance L 1, discharge switch K2, rapid cut-off K switch 3, protective resistance R1; One end of described protection inductance L 1 and one end of described rapid cut-off K switch 3 are connected to the two ends of described energy-storage system respectively, the other end of described protection inductance L 1 is connected to one end of described discharge switch K2, the other end of described rapid cut-off K switch 3 is connected with the other end of described discharge switch K2, the other end of described discharge switch K2 is also connected to one end of protective resistance R1, and the other end of described protective resistance R1 and one end of described rapid cut-off K switch 3 are connected to two inputs of actuating coil respectively; Described discharge switch K2 and rapid cut-off K switch 3 are electrical connected with described control system.Described rapid cut-off switch is current break module 71.Described rapid cut-off K switch 3 is IGCT reverse-blocking tetrode thyristor.
In the present embodiment, as shown in Figure 3, described charge circuit comprises the charge switch K1 (65), rectification filtering module 61, inverter circuit module 62, high-frequency impulse voltage changing module 63 and the final rectification module 64 that are connected successively;
Described rectification filtering module comprises one first low frequency rectifier bridge 611, current-limiting resistance R2, filter capacitor C
zand current limiting switch K4, industrial-frequency alternating current is connected with the input of described first low frequency rectifier bridge by described charge switch K1, the negative output terminal of described first low frequency rectifier bridge is connected to one end of described current-limiting resistance R2, and the other end of described current-limiting resistance R2 is connected to described filter capacitor C
zone end, the positive output end of described first low frequency rectifier bridge is connected to described filter capacitor C
zthe other end, the two ends of described current limiting switch K4 are connected with the two ends of described current-limiting resistance R2 respectively, and wherein said charge switch K1 and described current limiting switch K4 is all electrical connected with described control system; Wherein, described current-limiting resistance R2 damages switch in order to prevent surge current.
Described inverter circuit module comprises the first brachium pontis electric capacity C1, the second brachium pontis electric capacity C2, the first power protection module 621, second power protection module 622, first main power tube T
r1, the second main power tube T
r2, wherein the first brachium pontis electric capacity C1, the second brachium pontis electric capacity C2, the first main power tube T
r1and the second main power tube T
r2common formation half-bridge form, described first power protection module and the second power protection module are connected in parallel on the first main power tube T respectively
r1colelctor electrode and emitter stage and the second main power tube T
r2colelctor electrode and emitter stage; Wherein said first power protection module and the second power protection module include a resistance and an electric capacity of mutually series connection, and the two ends of described resistance are also connected to a power diode; Wherein realized the change of the sense of current by the discharge and recharge of two brachium pontis electric capacity, and add the operation that power protection module controls inverter circuit module.
Described high-frequency impulse voltage changing module comprises armature winding 631, iron core 632 and secondary windings 633, the two ends of described armature winding respectively with tie point and the second main power tube T of the first brachium pontis electric capacity C1 in described inverter circuit module and the second brachium pontis electric capacity C2
r2colelctor electrode, the two ends of described secondary windings are connected with described final rectification module;
Described final rectification module comprises the second low frequency rectifier bridge, two inputs of described second low frequency rectifier bridge are connected with the two ends of the secondary windings in described high-frequency impulse voltage changing module, and the positive output end of described second low frequency rectifier bridge and negative output terminal are connected in parallel to the two ends of described energy-storage system respectively.
In the present embodiment, described energy-storage system comprises the capacitor of N number of parallel connection, the two ends of described capacitor as the two ends of described energy-storage system, wherein, N be more than or equal to 1 positive integer.
The present embodiment additionally provides a kind of control method causing the device of electromagnetic attraction form metal plate based on current break mentioned above, mainly comprises the following steps:
Step S1: the top actuator comprising actuating coil and mould being placed in metal blank to be formed;
Step S2: the charge switch K1 controlled in described charge circuit by control system closes, current limiting switch K4 opens a way, discharge switch K2 in described discharge loop opens a way, rapid cut-off K switch 3 is opened a way, after stable by external industrial-frequency alternating current input current, closed current limiting switch K4 starts charging, and industrial-frequency alternating current completes to the charging of energy-storage system by the rectification filtering module in described charge circuit, inverter circuit module, high-frequency impulse voltage changing module, final rectification module successively; Automatic turn off charge switch K1 and current limiting switch K4 subsequently;
Step S3: closed discharge switch K2, energy-storage system and actuating coil, protective resistance R1, protect inductance L 1 to form complete RLC loop, by pulse heavy current that low frequency slowly rises in actuating coil;
Step S4: the current break module in described discharge loop is certain hour linkage work after discharge switch K2 is closed, oppositely apply high-frequency pulse heavy current fast, the current break in actuating coil declines fast; Wherein, described certain hour is the time that in actuating coil, electric current rises to maximum;
Step S5: the inductive loop in the magnetic field that electric current that the slow rising applied in actuating coil declines fast causes and metal blank, impel metal blank to move to actuating coil, the restriction being subject to mould is shaped as Fig. 2.
Especially, as shown in Figure 4, power-supply system applies an electric current slowly risen in discharge loop, and suddenly change to during peaking at electric current, this function of current, in the actuating coil of connecting with discharge loop, produces an induced field around actuating coil 1, and causes a generation inductive loop in metal blank 3 consistent with the sense of current in actuating coil, metal blank 3 moves to actuating coil 1, and the restriction being subject to mould 2 is configured as the shape of specifying.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Embodiment 2
As shown in Figure 5, be with the difference of embodiment 1: current break module 71 comprises auxiliary capacitor C3 ' and the rapid cut-off K switch 3 in high-speed switch K3 ' alternative embodiment 1, after auxiliary capacitor C3 ' connects with high-speed switch K3 ', in parallel with actuating coil.Wherein, described rapid cut-off K switch 3 ' is IGCT reverse-blocking tetrode thyristor.Present embodiments provide a kind of control method causing the device of electromagnetic attraction form metal plate based on current break mentioned above thus, mainly comprise the following steps:
Step S1: the top actuator comprising actuating coil and mould being placed in metal blank to be formed;
Step S2: the charge switch K1 controlled in described charge circuit by control system closes, current limiting switch K4 opens a way, discharge switch K2 in described discharge loop opens a way, high-speed switch K3 ' opens a way, after stable by external industrial-frequency alternating current input current, closed current limiting switch K4 starts charging, and industrial-frequency alternating current completes to the charging of energy-storage system by the rectification filtering module in described charge circuit, inverter circuit module, high-frequency impulse voltage changing module, final rectification module successively; Automatic turn off charge switch K1 and current limiting switch K4 subsequently;
Step S3: closed discharge switch K2, energy-storage system and actuating coil, protective resistance R1, protect inductance L 1 to form complete RLC loop, by pulse heavy current that low frequency slowly rises in actuating coil;
Step S4: the current break module in described discharge loop is certain hour linkage work after discharge switch K2 is closed, oppositely apply high-frequency pulse heavy current fast, the current break in actuating coil declines fast; Wherein, described certain hour is the time that in actuating coil, electric current rises to maximum;
Step S5: the inductive loop in the magnetic field that electric current that the slow rising applied in actuating coil declines fast causes and metal blank, impel metal blank to move to actuating coil, the restriction being subject to mould is shaped as Fig. 2.
Embodiment 3
As shown in Figure 6, be with the difference of embodiment 1: current break module 71 comprises fuse cutout K3 " rapid cut-off K switch 3 in alternative embodiment 1, fuse cutout K3 " connect with actuating coil.Wherein, described fuse cutout K3 " comprise fuse and carry out open circuit.Present embodiments provide a kind of control method causing the device of electromagnetic attraction form metal plate based on current break mentioned above thus, mainly comprise the following steps:
Step S1: the top actuator comprising actuating coil and mould being placed in metal blank to be formed;
Step S2: the charge switch K1 controlled in described charge circuit by control system closes, current limiting switch K4 opens a way, discharge switch K2 in described discharge loop opens a way, fuse cutout K3 " closed; after stable by external industrial-frequency alternating current input current; closed current limiting switch K4 starts charging, industrial-frequency alternating current completes to the charging of energy-storage system by the rectification filtering module in described charge circuit, inverter circuit module, high-frequency impulse voltage changing module, final rectification module successively; Automatic turn off charge switch K1 and current limiting switch K4 subsequently;
Step S3: closed discharge switch K2, energy-storage system and actuating coil, protective resistance R1, protect inductance L 1 to form complete RLC loop, by pulse heavy current that low frequency slowly rises in actuating coil;
Step S4: the current break module in described discharge loop is certain hour linkage work after discharge switch K2 is closed, fuse K3 " disconnect, the current break in actuating coil declines fast; Wherein, described certain hour is the time that in actuating coil, electric current rises to maximum;
Step S5: the inductive loop in the magnetic field that electric current that the slow rising applied in actuating coil declines fast causes and metal blank, impel metal blank to move to actuating coil, the restriction being subject to mould is shaped as Fig. 2.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. current break causes a device for electromagnetic attraction form metal plate, it is characterized in that: comprise and perform part and power-supply system; Described enforcement division is divided and is comprised actuating coil, mould, metal blank, and described mould is arranged between described actuating coil and metal blank, and described actuating coil and mould are fixed together as actuator; Described power-supply system comprises control system, energy-storage system, charge circuit, discharge loop, described charge circuit is connected to described energy-storage system two ends, described discharge loop two ends are also connected to described energy-storage system two ends, described control system and described charge circuit, discharge loop are electrically connected, and described actuating coil and described discharge loop are electrically connected.
2. a kind of current break according to claim 1 causes the device of electromagnetic attraction form metal plate, it is characterized in that: described actuating coil comprises the copper cash being wound in dish type and the insulating materials be coated on outside described copper cash, the two ends of described copper cash are connected with discharge loop as two inputs of described actuating coil.
3. a kind of current break according to claim 1 causes the device of electromagnetic attraction form metal plate, it is characterized in that: be sinusoidal decay electric current before being applied to the current break on described actuating coil, and meet I (t)=I
maxe
-βsin (ω t), described electric current declined to sudden change during peaking fast in 1/4 cycle, and before peak value, power frequency meets
peak value after-current frequency meets
wherein, I is electric current; E is natural number; β is attenuation coefficient; ω is angular frequency; T is the time, and f is frequency; μ
0for metal blank magnetic conductivity; γ is metal blank electrical conductivity; D is metal blank thickness.
4. a kind of current break according to any one of claim 1-3 causes the device of electromagnetic attraction form metal plate, it is characterized in that: described discharge loop comprises discharge switch K2 and current break module, described discharge switch K2 and described actuating coil are cascaded, and the branch road comprising described discharge switch K2 and described actuating coil is connected to the two ends of energy-storage system; Described current break model calling is at described actuating coil two ends; Described discharge switch K2 and current break module and described control system are electrical connected.
5. a kind of current break according to claim 4 causes the device of electromagnetic attraction form metal plate, it is characterized in that: described current break module is rapid cut-off K switch 3; Described rapid cut-off K switch 3 is IGCT reverse-blocking tetrode thyristor.
6. a kind of current break according to claim 4 causes the device of electromagnetic attraction form metal plate, it is characterized in that: described current break module is the auxiliary capacitor C3 ' of series connection mutually and high-speed switch K3 '; Described high-speed switch K3 ' is IGCT reverse-blocking tetrode thyristor.
7. a kind of current break according to any one of claim 1-3 causes the device of electromagnetic attraction form metal plate, it is characterized in that: described discharge loop comprises discharge switch K2 and current break module, described discharge switch K2 and described actuating coil are cascaded, and the branch road comprising described discharge switch K2 and described actuating coil is connected to the two ends of energy-storage system; Described current break module is connected with described actuating coil, and described current break module is fuse cutout K3 "; Described discharge switch K2 and current break module and described control system are electrical connected; Described fuse cutout K3 " comprise fuse and carry out open circuit.
8. a kind of current break according to any one of claim 1-3 causes the device of electromagnetic attraction form metal plate, it is characterized in that: described energy-storage system comprises the capacitor of N number of parallel connection, the two ends of described capacitor as the two ends of described energy-storage system, wherein N be more than or equal to 1 positive integer.
9. cause a control method for the device of electromagnetic attraction form metal plate based on current break according to claim 4, it is characterized in that comprising the following steps:
Step S1: the top actuator comprising actuating coil and mould being placed in metal blank to be formed;
Step S2: the charge switch K1 controlled in described charge circuit by control system closes, discharge switch K2 in described discharge loop opens a way, rapid cut-off K switch 3 in current break module or high-speed switch K3 ' open a way, energy-storage system starts charging, and industrial-frequency alternating current completes to the charging of energy-storage system by the rectification filtering module in described charge circuit, inverter circuit module, high-frequency impulse voltage changing module, final rectification module successively; Automatic turn off charge switch K1 subsequently;
Step S3: closed discharge switch K2, energy-storage system and actuating coil, form complete RLC loop, by pulse heavy current that low frequency slowly rises in actuating coil;
Step S4: the current break module in described discharge loop is certain hour linkage work after discharge switch K2 is closed, oppositely apply high-frequency pulse heavy current fast, the current break in actuating coil declines fast; Wherein, described certain hour is the time that in actuating coil, electric current rises to maximum;
Step S5: the inductive loop in the magnetic field that electric current that the slow rising applied in actuating coil declines fast causes and metal blank, impel metal blank to move to actuating coil, the restriction being subject to mould is shaped.
10. cause a control method for the device of electromagnetic attraction form metal plate based on current break according to claim 7, it is characterized in that comprising the following steps:
Step S1: the top actuator comprising actuating coil and mould being placed in metal blank to be formed;
Step S2: the charge switch K1 controlled in described charge circuit by control system closes, discharge switch K2 in described discharge loop opens a way, fuse cutout K3 in current break module " do not arrive blowout current and normally work; energy-storage system starts charging, and industrial-frequency alternating current completes to the charging of energy-storage system by the rectification filtering module in described charge circuit, inverter circuit module, high-frequency impulse voltage changing module, final rectification module successively; Automatic turn off charge switch K1 subsequently;
Step S3: closed discharge switch K2, energy-storage system and actuating coil, form complete RLC loop, by pulse heavy current that low frequency slowly rises in actuating coil;
Step S4: the current break module in described discharge loop is certain hour linkage work after discharge switch K2 is closed, oppositely apply high-frequency pulse heavy current fast, the current break in actuating coil declines fast; Wherein, described certain hour is the time that in actuating coil, electric current rises to maximum;
Step S5: the inductive loop in the magnetic field that electric current that the slow rising applied in actuating coil declines fast causes and metal blank, impel metal blank to move to actuating coil, the restriction being subject to mould is shaped.
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