CN112792202A - Device and method for improving forming uniformity of light alloy pipe fitting - Google Patents
Device and method for improving forming uniformity of light alloy pipe fitting Download PDFInfo
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- CN112792202A CN112792202A CN202011466923.8A CN202011466923A CN112792202A CN 112792202 A CN112792202 A CN 112792202A CN 202011466923 A CN202011466923 A CN 202011466923A CN 112792202 A CN112792202 A CN 112792202A
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- 229910001234 light alloy Inorganic materials 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 230000000630 rising effect Effects 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 8
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000009827 uniform distribution Methods 0.000 abstract description 2
- 230000009977 dual effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000001846 repelling effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
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Abstract
A device and a method for improving forming uniformity of a light alloy pipe fitting comprise a frame, a dual-drive coil and a dual-pulse power supply, wherein penetrating pipe fitting holes are formed in an upper fixing plate and a lower fixing plate of the frame, the dual-drive coil is arranged on two sides of each pipe fitting hole and matched with the upper fixing plate and the lower fixing plate, the dual-drive coil is connected with the dual-pulse power supply, the alloy pipe fitting penetrates through the pipe fitting holes, and the alloy pipe fitting is formed by the dual-drive coil after being electrified and generating Lorentz force according to time sequence matching. The invention overcomes the problems that the original pipe fitting has extremely uneven acting force, poor forming uniformity, extremely serious wall thickness reduction and influences the forming precision and the use performance during electromagnetic forming, and has the characteristics of simple structure, uniform distribution of Lorentz force on the pipe fitting, reduction of wall thickness reduction area, and improvement of the forming precision and the use performance of the pipe fitting.
Description
Technical Field
The invention belongs to the technical field of alloy pipe forming, and relates to a device and a method for improving forming uniformity of a light alloy pipe.
Background
At present, most of light alloy (such as aluminum alloy, magnesium alloy and the like) pipe fittings are formed by forcing a workpiece to deform through a die by adopting traditional mechanical force and hydraulic force. However, the light alloy has poor forming performance at room temperature, the traditional processing method is easy to crack, and the resilience is large, so that the forming limit of the light alloy can be obviously improved if electromagnetic forming is adopted, and the problems are effectively solved. However, in the existing electromagnetic forming process, when a pipe fitting is formed, the acting force on the pipe fitting is extremely uneven, so that the uniformity of a formed workpiece is poor, the wall thickness of a partial area is extremely seriously reduced, and the forming precision and the service performance are seriously influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for improving the forming uniformity of a light alloy pipe fitting, wherein the device and the method are simple in structure, penetrating pipe fitting holes are formed in an upper fixing plate and a lower fixing plate of a frame, double driving coils are arranged on two sides of each pipe fitting hole and matched with the upper fixing plate and the lower fixing plate, the double driving coils are connected with a double pulse power supply, the alloy pipe fitting penetrates through the pipe fitting holes, and the double driving coils are matched with each other according to time sequence after being electrified to form the pipe fitting, so that the Lorentz force is uniformly distributed on the pipe fitting, the area with reduced wall thickness is reduced, and the forming precision and the use performance of the pipe.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a device for improving the forming uniformity of a light alloy pipe fitting comprises a frame, a dual-drive coil and a dual-pulse power supply; the pipe fitting hole on the frame penetrates through the upper fixing plate and the lower fixing plate of the frame, the double-drive coils are arranged on two sides of the pipe fitting hole and matched with the upper fixing plate and the lower fixing plate, the double-drive coils are respectively connected with the double-pulse power supply, and the double-pulse power supply is connected with the PLC control system; lorentz force generated by the dual-drive coils is uniformly distributed between the pipe fitting hole and the dual-drive coils.
The double-drive coils on two sides of the pipe hole are mutually symmetrical.
The double-drive coils on two sides of the pipe fitting hole are staggered with each other.
The dual-drive coil respectively generates a long pulse width current and a short pulse width current.
The double-drive coil induces clockwise eddy current J firstlye-lInduced eddy current Je-lWith the axial component B of the magnetic fieldz-lActing together to produce Lorentz force Fp。
When the pulse width current reaches the peak value, the short pulse width current is introduced to induce a counterclockwise eddy current Je-sInduced eddy current J when the magnetic field direction is not changede-sActing together to produce Lorentz force Fa。
The formula of the radial electromagnetic force between the driving coils (2) is as follows:
when in use
Wherein alpha is a proportionality coefficient; i is a forming coil excitation current; fp，FaRespectively representing inward repulsive force and outward attractive electromagnetic force;
representing the slope steepness of the current waveform.
The radial electromagnetic force between the driving coils (2) is simplified as follows:
The forming method of the device for improving the forming uniformity of the light alloy pipe fitting comprises the following steps:
s1, annealing pretreatment is carried out on the pipe fitting;
s2, inserting the pipe fitting into the pipe fitting hole, wherein the formed area part of the pipe fitting is positioned between the double driving coils; two ends of the pipe fitting are fixed through clamping equipment or pressure equipment;
s3, forming, wherein a PLC control system is used for controlling the discharge of a double-pulse power supply, a pulse magnetic field is generated in a forming area, and the pipe fitting generates induction eddy current;
s3-1, when the discharging current is on the rising edge, the pipe receives radial electromagnetic force with inward direction;
s3-2, when the discharging current is at the falling edge, the pipe receives the radial electromagnetic force with the direction facing outwards;
s3-3, reducing the gradient of the waveform of the rising edge of the current in the coil, increasing the gradient of the waveform of the falling edge of the current in the coil, increasing the radial attractive electromagnetic force and reducing the radial repulsive electromagnetic force;
s3-4, controlling the current waveform in time sequence, namely when the long pulse width current reaches the peak value, switching on the short pulse width current discharge loop, and generating clockwise induced eddy current in the pipe fitting and generating radial inward electromagnetic force under the action of the axial component of the magnetic field; after the short pulse width current is conducted, the induced eddy current on the pipe fitting is quickly reversed, the direction of the magnetic field is unchanged, and the induced eddy current and the axial component of the magnetic field act to generate radial outward electromagnetic force to form the pipe fitting.
A device and a method for improving forming uniformity of a light alloy pipe fitting comprise a frame, a dual-drive coil and a dual-pulse power supply, wherein penetrating pipe fitting holes are formed in an upper fixing plate and a lower fixing plate of the frame, the dual-drive coil is arranged on two sides of each pipe fitting hole and matched with the upper fixing plate and the lower fixing plate, the dual-drive coil is connected with the dual-pulse power supply, the alloy pipe fitting penetrates through the pipe fitting holes, and the alloy pipe fitting is formed by the dual-drive coil after being electrified and generating Lorentz force according to time sequence matching. The invention overcomes the problems that the original pipe fitting has extremely uneven acting force, poor forming uniformity, extremely serious wall thickness reduction and influences the forming precision and the use performance during electromagnetic forming, and has the characteristics of simple structure, uniform distribution of Lorentz force on the pipe fitting, reduction of wall thickness reduction area, and improvement of the forming precision and the use performance of the pipe fitting.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a front view of fig. 1.
FIG. 3 is a schematic diagram of the position structure of the dual drive coil and the pipe fitting of the present invention.
FIG. 4 is an idealized current waveform diagram for a dual drive coil.
FIG. 5 is a schematic view of the inward force direction of the pipe when the combined current of the dual-drive coils rises.
FIG. 6 is a schematic view showing the direction of outward force applied to the pipe when the combined current of the dual-drive coils rises.
Figure 7 is a forming view of a pipe before modification.
Figure 8 is a drawing of the tube formation before and after modification.
In the figure: the device comprises a frame 1, a pipe fitting hole 11, an upper fixing plate 12, a lower fixing plate 13 and a dual-drive coil 2.
Detailed Description
As shown in fig. 1 to 8, an apparatus for improving the forming uniformity of a light alloy pipe is characterized in that: the device comprises a frame 1, a dual-drive coil 2 and a dual-pulse power supply; the pipe fitting hole 11 on the frame 1 penetrates through an upper fixing plate 12 and a lower fixing plate 13 of the frame 1, the double-drive coils 2 are arranged on two sides of the pipe fitting hole 11 and matched with the upper fixing plate 12 and the lower fixing plate 13, the double-drive coils 2 are respectively connected with a double-pulse power supply, and the double-pulse power supply is connected with a PLC control system; lorentz force generated by the dual-drive coil 2 is uniformly distributed between the pipe fitting hole 11 and the dual-drive coil 2. Simple structure, through set up the pipe fitting hole 11 that runs through on the upper fixed plate 12 and the bottom plate 13 at frame 1, it sets up dual drive coil 2 and the cooperation of upper fixed plate 12 and bottom plate 13 to be located pipe fitting hole 11 both sides, dual drive coil 2 is connected with the dipulse power supply, the alloy pipe fitting passes pipe fitting hole 11, form the pipe fitting according to the chronogenesis cooperation production lorentz force after 2 circular telegrams through dual drive coil, make lorentz force evenly distributed on the pipe fitting, the regional reduction of wall thickness attenuate, promote pipe fitting shaping precision and performance.
In a preferred scheme, the double driving coils 2 on two sides of the pipe fitting hole 11 are symmetrical to each other. When the device is used, the double-drive coils 2 on two sides of the pipe fitting hole 11 are mutually symmetrical, so that stress is balanced in a forming area when a gold pipe fitting is formed.
In the preferred scheme, the double-drive coils 2 on two sides of the pipe fitting hole are staggered with each other. When the double-drive coil 2 is used, the double-drive coils 2 on two sides of the pipe fitting hole 11 are staggered with each other, so that the forming shape of the alloy pipe fitting can be changed conveniently to adapt to the forming specifications of different pipe fittings.
Preferably, the specification of pipe forming is expanded by changing the position and the layout of the double-drive coil 2.
In a preferred scheme, the double driving coils 2 respectively generate a long pulse width current and a short pulse width current. When the pulse power supply with the long pulse width current is used, the capacitor bank with the larger total capacity is selected, and the capacitor bank with the smaller total capacity is selected by the pulse power supply with the short pulse width current.
In a preferred scheme, the double-drive coil 2 induces clockwise eddy current J firstlye-lInduced eddy current Je-lWith the axial component B of the magnetic fieldz-lActing together to produce Lorentz force Fp。
In a preferred scheme, when the growing pulse width current reaches a peak value, a short pulse width current is introduced to induce a counterclockwise eddy current Je-sThe direction of the magnetic field is not changed and the Lorentz force F is generated by the combined action of the magnetic field and the induced eddy currenta. When the device is used, after the double-drive coil 2 discharges, a pulse magnetic field is generated in a forming area, and then the workpiece generates an induced eddy current.
In a preferred embodiment, the radial electromagnetic force between the driving coils 2 is expressed by the following formula:
FaRespectively representing the repulsive force and the square of the direction facing inwardsAn outward attracting electromagnetic force;
representing the slope steepness of the current waveform. When the discharge current is at the rising edge, the pipe fitting is mainly subjected to radial electromagnetic force with an inward direction; when the discharge current is at the falling edge, the pipe is mainly subjected to radial electromagnetic force in an outward direction.
In a preferred embodiment, the radial electromagnetic force between the driving coils 2 is simplified as follows:
In a preferred embodiment, the method for forming the device for improving the forming uniformity of the light alloy pipe fitting comprises the following steps:
s1, annealing pretreatment is carried out on the pipe fitting;
s2, inserting the pipe fitting into the pipe fitting hole 11, wherein the formed area part of the pipe fitting is positioned between the double-drive coils 2; two ends of the pipe fitting are fixed through clamping equipment or pressure equipment;
s3, forming, wherein a PLC control system is used for controlling the discharge of a double-pulse power supply, a pulse magnetic field is generated in a forming area, and the pipe fitting generates induction eddy current;
s3-1, when the discharging current is on the rising edge, the pipe receives radial electromagnetic force with inward direction;
s3-2, when the discharging current is at the falling edge, the pipe receives the radial electromagnetic force with the direction facing outwards;
s3-3, reducing the gradient of the waveform of the rising edge of the current in the coil, increasing the gradient of the waveform of the falling edge of the current in the coil, increasing the radial attractive electromagnetic force and reducing the radial repulsive electromagnetic force;
s3-4, controlling the current waveform in time sequence, namely, when the long pulse width current reaches the peak value, switching on the short pulse width current discharge circuit, after the short pulse width current is switched on, the induced eddy current on the pipe fitting is rapidly reversed, the direction of the magnetic field is unchanged, and at the moment, the induced eddy current and the axial component of the magnetic field act to generate a radial outward electromagnetic force to form the pipe fitting. The method ensures that the Lorentz force is uniformly distributed on the pipe fitting, and is beneficial to reducing the forming wall thickness reduction area.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (9)
1. A device for improving forming uniformity of a light alloy pipe fitting is characterized in that: the double-pulse power supply comprises a frame (1), a double-drive coil (2) and a double-pulse power supply; the pipe fitting hole (11) in the frame (1) penetrates through an upper fixing plate (12) and a lower fixing plate (13) of the frame (1), the dual-drive coils (2) are arranged on two sides of the pipe fitting hole (11) and matched with the upper fixing plate (12) and the lower fixing plate (13), the dual-drive coils (2) are respectively connected with a dual-pulse power supply, and the dual-pulse power supply is connected with a PLC control system; lorentz force generated by the double-drive coils (2) is uniformly distributed between the pipe fitting hole (11) and the double-drive coils (2).
2. The apparatus for improving the forming uniformity of a lightweight alloy pipe as claimed in claim 1, wherein: the double-drive coils (2) on the two sides of the pipe hole (11) are symmetrical to each other.
3. The apparatus for improving the forming uniformity of a lightweight alloy pipe as claimed in claim 1, wherein: the double-drive coils (2) on the two sides of the pipe fitting hole (11) are staggered with each other.
4. The apparatus for improving the forming uniformity of a lightweight alloy pipe as claimed in claim 1, wherein: the double-drive coil (2) respectively generates a long pulse width current and a short pulse width current.
5. The apparatus for improving the forming uniformity of a lightweight alloy pipe as claimed in claim 1, wherein: the double-drive coil (2) induces clockwise eddy current J firstlye-lInduced eddy current Je-lWith the axial component B of the magnetic fieldz-lActing together to produce Lorentz force Fp。
6. The apparatus for improving the forming uniformity of a lightweight alloy pipe as set forth in claim 4, wherein: when the pulse width current reaches the peak value, the short pulse width current is introduced to induce a counterclockwise eddy current Je-sThe direction of the magnetic field is not changed and the Lorentz force F is generated by the combined action of the magnetic field and the induced eddy currenta。
7. The apparatus for improving the forming uniformity of a lightweight alloy pipe as claimed in claim 1, wherein: the formula of the radial electromagnetic force between the driving coils (2) is as follows:
when in use
Wherein alpha is a proportionality coefficient; i is a formed coilExciting current; fp，FaRespectively representing inward repulsive force and outward attractive electromagnetic force;
representing the slope steepness of the current waveform.
8. The apparatus for improving the forming uniformity of a lightweight alloy pipe as claimed in claim 7, wherein: the radial electromagnetic force between the driving coils (2) is simplified as follows:
wherein, Je-l，Je-sThe induced eddy current density component generated by the long pulse width current and the induced eddy current density component generated by the short pulse width current are respectively, and the induced eddy current is positive in the anticlockwise direction; b isz-l，Bz-sAxial magnetic flux density is obtained after long and short pulse width current is introduced into the forming coil respectively; t is t1The time when the short pulse width current is conducted is also the time when the long pulse width current reaches the peak value.
9. The forming method of the device for improving the forming uniformity of the light alloy pipe fitting according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, annealing pretreatment is carried out on the pipe fitting;
s2, inserting the pipe fitting into the pipe fitting hole (11), wherein the formed area part of the pipe fitting is positioned between the double driving coils (2);
s3, forming, wherein a PLC control system is used for controlling the discharge of a double-pulse power supply, a pulse magnetic field is generated in a forming area, and the pipe fitting generates induction eddy current;
s3-1, when the discharging current is on the rising edge, the pipe receives radial electromagnetic force with inward direction;
s3-2, when the discharging current is at the falling edge, the pipe receives the radial electromagnetic force with the direction facing outwards;
s3-3, reducing the gradient of the waveform of the rising edge of the current in the coil, increasing the gradient of the waveform of the falling edge of the current in the coil, increasing the radial attractive electromagnetic force and reducing the radial repulsive electromagnetic force;
s3-4, controlling the current waveform in time sequence, namely when the long pulse width current reaches the peak value, switching on the short pulse width current discharge loop, generating clockwise induced eddy current and generating radial inward electromagnetic force in the current waveform pipe fitting, after the short pulse width current is switched on, rapidly reversing the induced eddy current on the pipe fitting but keeping the magnetic field direction unchanged, and generating radial outward electromagnetic force to form the pipe fitting by the action of the induced eddy current and the axial component of the magnetic field.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011466923.8A CN112792202A (en) | 2020-12-14 | 2020-12-14 | Device and method for improving forming uniformity of light alloy pipe fitting |
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| CN202011466923.8A CN112792202A (en) | 2020-12-14 | 2020-12-14 | Device and method for improving forming uniformity of light alloy pipe fitting |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1688397A (en) * | 2002-10-21 | 2005-10-26 | Bl化学有限及两合公司 | Device and method for reshaping bar-shaped materials particularly for drawing and extruding |
| CN103406418A (en) * | 2013-08-05 | 2013-11-27 | 三峡大学 | Method and device for electromagnetically forming metal pipe fitting in radial and axial loading mode |
| CN103586324A (en) * | 2013-10-30 | 2014-02-19 | 华中科技大学 | Electromagnetic internal stress shape adjusting method for metal plate |
| CN105047356A (en) * | 2015-08-26 | 2015-11-11 | 哈尔滨工业大学 | Solenoid coil for magnetic pulse forming |
| CN106944527A (en) * | 2017-04-01 | 2017-07-14 | 三峡大学 | A kind of pipe forming device and method based on electromagnetic attraction |
| US20190001391A1 (en) * | 2015-12-23 | 2019-01-03 | Guala Closures S.P.A. | Methods of forming closure members |
| CN208466939U (en) * | 2018-05-25 | 2019-02-05 | 福州大学 | A kind of variable cross-section metal pipe material Electromagnetic bulging device |
| CN109702072A (en) * | 2018-12-29 | 2019-05-03 | 华中科技大学 | A kind of metalwork electromagnetic attraction forming device |
| CN109946181A (en) * | 2019-03-18 | 2019-06-28 | 三峡大学 | It is a kind of for testing the device and method of metallic welded tubes part connector impact strength |
| CN109967594A (en) * | 2019-03-18 | 2019-07-05 | 三峡大学 | Corrugated device and method when a kind of reduction tube compression using axial magnetic pulling force |
| CN110799283A (en) * | 2017-07-12 | 2020-02-14 | 株式会社神户制钢所 | Electromagnetic forming device and electromagnetic forming method for aluminum pipe member |
| CN111112435A (en) * | 2019-12-17 | 2020-05-08 | 三峡大学 | Method and device for quickly forming hollow metal plate |
| CN111515291A (en) * | 2020-04-30 | 2020-08-11 | 华中科技大学 | Electromagnetic forming device and method for metal pipe fitting |
-
2020
- 2020-12-14 CN CN202011466923.8A patent/CN112792202A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1688397A (en) * | 2002-10-21 | 2005-10-26 | Bl化学有限及两合公司 | Device and method for reshaping bar-shaped materials particularly for drawing and extruding |
| CN103406418A (en) * | 2013-08-05 | 2013-11-27 | 三峡大学 | Method and device for electromagnetically forming metal pipe fitting in radial and axial loading mode |
| CN103586324A (en) * | 2013-10-30 | 2014-02-19 | 华中科技大学 | Electromagnetic internal stress shape adjusting method for metal plate |
| CN105047356A (en) * | 2015-08-26 | 2015-11-11 | 哈尔滨工业大学 | Solenoid coil for magnetic pulse forming |
| US20190001391A1 (en) * | 2015-12-23 | 2019-01-03 | Guala Closures S.P.A. | Methods of forming closure members |
| CN106944527A (en) * | 2017-04-01 | 2017-07-14 | 三峡大学 | A kind of pipe forming device and method based on electromagnetic attraction |
| CN110799283A (en) * | 2017-07-12 | 2020-02-14 | 株式会社神户制钢所 | Electromagnetic forming device and electromagnetic forming method for aluminum pipe member |
| CN208466939U (en) * | 2018-05-25 | 2019-02-05 | 福州大学 | A kind of variable cross-section metal pipe material Electromagnetic bulging device |
| CN109702072A (en) * | 2018-12-29 | 2019-05-03 | 华中科技大学 | A kind of metalwork electromagnetic attraction forming device |
| CN109946181A (en) * | 2019-03-18 | 2019-06-28 | 三峡大学 | It is a kind of for testing the device and method of metallic welded tubes part connector impact strength |
| CN109967594A (en) * | 2019-03-18 | 2019-07-05 | 三峡大学 | Corrugated device and method when a kind of reduction tube compression using axial magnetic pulling force |
| CN111112435A (en) * | 2019-12-17 | 2020-05-08 | 三峡大学 | Method and device for quickly forming hollow metal plate |
| CN111515291A (en) * | 2020-04-30 | 2020-08-11 | 华中科技大学 | Electromagnetic forming device and method for metal pipe fitting |
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