CN112792203A - Axial reinforcement method and device for electromagnetic forming coil - Google Patents
Axial reinforcement method and device for electromagnetic forming coil Download PDFInfo
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- CN112792203A CN112792203A CN202011532213.0A CN202011532213A CN112792203A CN 112792203 A CN112792203 A CN 112792203A CN 202011532213 A CN202011532213 A CN 202011532213A CN 112792203 A CN112792203 A CN 112792203A
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- coil
- axial
- electromagnetic forming
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Electromagnets (AREA)
Abstract
The invention discloses an axial reinforcement method and device for an electromagnetic forming coil; the method comprises the following steps: (1) winding a metal conductor on a coil framework, and uniformly coating curing glue; (2) after the outgoing is finished, uniformly winding the fiber material on the outer side of the conductor, and simultaneously uniformly coating curing glue to fully impregnate the fiber; (3) after full solidification, winding axial reinforcing fibers, wherein each group of axial reinforcing fibers are repeatedly wound along the radius through a central hole and pulled to be fastened; (4) and after winding is finished, coating curing glue on the surface of the fiber until the fiber is fully impregnated, and after full curing, completing axial reinforcement. In electromagnetic forming, a coil is subjected to reverse axial pulse electromagnetic force, and after long-term use, an internal conductor is easy to displace axially and even burst out to cause damage to a magnet. According to the invention, effective constraint is provided in the axial direction of the coil by applying an axial reinforcement mode to the electromagnetic forming coil, and the service life of the electromagnetic forming coil is effectively prolonged.
Description
Technical Field
The invention belongs to the technical field of metal forming and manufacturing, and particularly relates to an axial reinforcing method and device for an electromagnetic forming coil.
Background
The use of the light alloy material provides an effective realization way for the light weight of industrial production in the fields of automobiles, aerospace and the like. And the light member represented by the aluminum alloy has poor forming performance under the traditional stamping/hydraulic quasi-static process, and is easy to have the problems of wrinkling, cracking, serious resilience and the like. Research shows that the forming performance of the light alloy at room temperature can be effectively improved by high-speed forming, and electromagnetic forming is used as a technology for forming metal materials at high speed by using Lorentz force, is an important supplement of the existing aluminum alloy forming technology, and is an effective means for realizing light-weight manufacturing.
The electromagnetic forming technology is an industrial application of a pulse magnet, and compared with the design of a pulse high-intensity magnetic field coil, a new problem needs to be considered in the design process of the electromagnetic forming coil. When the pulse high-intensity magnetic field coil is used, the interior of the magnet can be regarded as only under the action of self electromagnetic force, and due to the symmetry, the stress of the pulse magnet in the axial direction is zero. During the electromagnetic forming of panel, metal sheet material has been placed to coil tip, and panel receives pulse electromagnetic force effect to take place to warp in the axial, and the coil also can receive the axial pulse electromagnetic force that a big or small equals the opposite direction in turn.
The outermost layer reinforcement and the layered reinforcement of the traditional reinforcement mode can only solve the problem of stress of the coil in the radial direction and the circumferential direction, and the end part of the coil needs to be fully restrained in the axial direction. The coil without axial reinforcement easily generates displacement in the axial direction of the internal conductor after long-term use, even partially collapses to cause damage to the magnet, and the safe and effective implementation of the forming is seriously influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an axial reinforcing method for an electromagnetic forming coil, and aims to solve the problems that in the prior art, the end part of the coil is not sufficiently restrained in the axial direction, so that a conductor is easy to displace in the axial direction to cause damage to a magnet and influence the forming safety.
The invention provides an axial reinforcement method for an electromagnetic forming coil, which comprises the following steps:
(1) winding a metal conductor on a coil framework, and uniformly coating curing glue in the winding process; wherein, the curing glue can be epoxy resin glue.
(2) When the outgoing is finished, the fiber material is uniformly wound on the outer side of the conductor, and curing glue is uniformly coated in the winding process, so that the fiber is fully impregnated;
(3) after the epoxy resin is cured, winding a plurality of groups of reinforcing fibers in the axial direction, and repeatedly winding and pulling each group of reinforcing fibers until the reinforcing fibers are fastened;
(4) and when the axial reinforcement fiber is completely wound, uniformly coating the curing glue on the surface of the fiber, fully impregnating the fiber, and after the epoxy resin is fully cured, completing the axial reinforcement of the electromagnetic forming coil.
According to the axial reinforcement method for the electromagnetic forming coil, provided by the invention, after the electromagnetic forming coil is wound and radially reinforced, in addition, an axial reinforcement mode is applied in the axial direction of the coil, sufficient constraint is formed in the axial direction of the electromagnetic forming coil, the generation of displacement in the axial direction of a coil conductor is prevented, and the service life of the electromagnetic forming coil is prolonged.
According to another aspect of the present invention, there is also provided an electromagnetic forming coil reinforcing apparatus, comprising: the device comprises axial reinforcing fibers, a coil framework, a metal conductor, a radial reinforcing layer, a female die and a power supply system; the metal conductor is wound on the middle column of the coil framework; the radial strengthening layer is wound outside the driving coil: the axial reinforcing fiber passes through the central hole of the coil framework and is wound and tensioned along the radius; the workpiece is arranged above the female die; placing the driving coil above the workpiece deformation area after the reinforcement is finished; the power supply system is used for driving the coil to supply power.
Furthermore, for the coil framework of which the center can not be perforated, the axial reinforcing fiber is directly wound along the diameter, and the displacement of the conductor in the axial direction can be restrained, so that the effect of axially reinforcing the electromagnetic forming coil is achieved.
Furthermore, when the axial reinforcing fibers are wound on the electromagnetic forming coil, a certain number of groups of the axial reinforcing fibers are ensured and are uniformly distributed in the annular direction, so that the integral stress of the electromagnetic forming coil is uniform, and the axial reinforcing effect is ensured.
Further, the reinforcing fiber material includes, but is not limited to, high strength fiber materials such as Zylon fibers, carbon fibers, glass fibers, and the like.
Furthermore, the application range of the invention includes but is not limited to electromagnetic forming devices for electromagnetic forming of plate, electromagnetic flanging and the like which are axially stressed.
Generally, compared with the prior art, the technical scheme of the invention provides effective constraint in the axial direction of the coil by applying an axial reinforcement mode to the electromagnetic forming coil, solves the problem that the axial direction of an internal conductor of the existing electromagnetic forming coil is easy to displace in the long-term use process, and further influences the service life of the coil, and can effectively prolong the service life of the electromagnetic forming coil.
Drawings
FIG. 1 is a schematic view of an electromagnetic forming device for an axially stiffened coil panel in accordance with a first embodiment of the present invention;
FIG. 2 is a schematic view of a bobbin with through holes according to a first embodiment of the present invention;
FIG. 3 is a schematic view of an axial reinforcement method for a skeleton-band via electromagnetic forming coil according to a first embodiment of the present invention;
FIG. 4 is a schematic view of a bobbin without through-holes in accordance with a second embodiment of the present invention;
FIG. 5 is a schematic diagram of an axial reinforcement method for an electromagnetically formed coil without through-holes of a bobbin according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of a coil current waveform provided by a capacitive energy storage type power supply system according to an embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: the structure comprises 1 axial reinforcing fibers, 2 a coil framework, 3 a metal conductor, 4 a radial reinforcing layer, 5 a workpiece, 6 a female die and 7 a power supply system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an axial strengthening method of an electromagnetic forming coil, which takes electromagnetic forming of a plate as an example in an application scene, as shown in figure 1, and comprises the following steps: the coil comprises axial reinforcing fibers 1, a coil framework 2, a metal conductor 3, a radial reinforcing layer 4, a female die 6 and a power supply system 7; wherein the axial reinforcement fiber 1 provides axial reinforcement for the coil; the radial reinforcing layer 4 is positioned outside the metal conductor 3 and provides radial and annular reinforcement for the coil; the workpiece 5 is arranged above the female die 6, and the female die 6 is used for restraining a deformation area of the workpiece 5; the coil metal conductor 3 generates a rapidly changing current, the discharge energy is transferred to the surface of the workpiece 5 through electromagnetic induction, a huge Lorentz force is induced on the workpiece 5 to drive the workpiece 5 to deform, and meanwhile, the coil is also subjected to the Lorentz force with equal magnitude and opposite direction; the power supply system 7 is used for supplying power to the driving coils, the type of the power supply is not limited, a capacitor type power supply can be adopted, a storage battery pack pulse power supply can also be adopted, and the like, in the embodiment of the invention, a capacitor pack power supply is adopted, and the specific current waveform is shown in fig. 6. The pressing means for limiting the vertical displacement of the coil and for providing the blank holder force are omitted in the drawings.
As shown in fig. 2, a cross-sectional view and a plan view of the bobbin 2 in the first embodiment are shown, the cross-section is a T-shaped structure, and a through hole is formed in the center of the bobbin.
As shown in fig. 3, a first embodiment of the present invention provides an axial strengthening method for a frame through-hole electromagnetic forming coil, which is used for limiting the displacement of a coil conductor in the axial direction and improving the service life of the electromagnetic forming coil.
The axial reinforcing method of the electromagnetic forming coil comprises the following steps:
(1) winding a metal conductor with good insulation on a coil framework, and uniformly coating curing glue during the winding process;
(2) after the outgoing line is finished, uniformly winding the fiber material on the outer side of the conductor, and simultaneously and uniformly coating curing glue in the winding process to fully impregnate the fiber;
(3) after the epoxy resin is fully cured, winding axial reinforcing fibers, wherein the number of the axial reinforcing fibers is 12 in the embodiment and are uniformly distributed along the circumferential direction, the fiber material is specifically distributed as shown in fig. 3, and each group is repeatedly wound and pulled to be fastened through a central through hole.
(4) And after the axial reinforcement fiber is completely wound, uniformly coating the curing glue on the surface of the fiber to fully impregnate the fiber, and after the epoxy resin is fully cured, completing the axial reinforcement of the electromagnetic forming coil.
As shown in fig. 4, there are shown a cross-sectional view and a plan view of the bobbin 2 without a through-hole in the second embodiment, the cross-section being a T-shaped structure with no through-hole in the center.
As shown in fig. 5, a second embodiment of the present invention provides an axial strengthening method for an electromagnetic forming coil without a through hole in a framework, which is also used for limiting the displacement of a coil conductor in the axial direction and improving the service life of the electromagnetic forming coil.
The axial reinforcing method of the electromagnetic forming coil comprises the following steps:
(1) winding a metal conductor with good insulation on a coil framework, and uniformly coating curing glue during the winding process;
(2) after the outgoing line is finished, uniformly winding the fiber material on the outer side of the conductor, and simultaneously and uniformly coating curing glue in the winding process to fully impregnate the fiber;
(3) after the epoxy resin is fully cured, winding axial reinforcing fibers, wherein the number of the axial reinforcing fibers is 6 in the embodiment, the axial reinforcing fibers are uniformly distributed along the circumferential direction, the specific distribution of the fiber materials is shown in fig. 5, and each group is repeatedly wound and pulled to be fastened along the diameter direction.
(4) And after the axial reinforcement fiber is completely wound, uniformly coating the curing glue on the surface of the fiber to fully impregnate the fiber, and after the epoxy resin is fully cured, completing the axial reinforcement of the electromagnetic forming coil.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. An axial reinforcement method for an electromagnetic forming coil is characterized by comprising the following steps:
(1) winding a metal conductor on a coil framework, and uniformly coating curing glue in the winding process;
(2) when the outgoing is finished, the fiber material is uniformly wound on the outer side of the conductor, and curing glue is uniformly coated in the winding process, so that the fiber is fully impregnated;
(3) after the epoxy resin is cured, winding a plurality of groups of reinforcing fibers in the axial direction, and repeatedly winding and pulling each group of reinforcing fibers until the reinforcing fibers are fastened;
(4) and when the axial reinforcement fiber is completely wound, uniformly coating the curing glue on the surface of the fiber, fully impregnating the fiber, and after the epoxy resin is fully cured, completing the axial reinforcement of the electromagnetic forming coil.
2. The axial reinforcement method for an electromagnetic forming coil according to claim 1, wherein in the step (3), each set of reinforcing fibers is repeatedly wound and pulled to be fastened through the central through hole.
3. The axial reinforcing method for an electromagnetic forming coil according to claim 1, wherein in the step (3), each set of reinforcing fibers is repeatedly wound in a diametrical direction and pulled to be fastened.
4. The method of axially reinforcing an electromagnetic forming coil according to claim 1, wherein the reinforcing fibers comprise Zylon fibers, carbon fibers or glass fibers.
5. An electromagnetic forming coil axial reinforcement device, comprising: the coil comprises axial reinforcing fibers (1), a coil framework (2), a metal conductor (3), a radial reinforcing layer (4), a concave die (6) and a power supply system (7);
the axial reinforcement fiber (1) is used for providing axial reinforcement for the coil;
the radial reinforcing layer (4) is positioned outside the metal conductor (3) and is used for providing radial and annular reinforcement for the coil;
the female die (6) is used for restraining a deformation area of the workpiece;
the power supply system (7) is used for supplying power to the driving coil;
when the electromagnetic induction type coil winding machine works, rapidly changing current is generated in the metal conductor (3), discharging energy is transmitted to the surface of a workpiece through electromagnetic induction, huge Lorentz force is induced on the workpiece and drives the workpiece to deform, and meanwhile, the coil is subjected to the Lorentz force with the same size and the opposite direction.
6. The axial reinforcement device for an electromagnetic forming coil according to claim 5, wherein the axial reinforcement fibers (1) are provided in a plurality of groups, each group being repeatedly wound to provide axial reinforcement to the coil.
7. The axial reinforcing apparatus for an electromagnetic forming coil according to claim 6, wherein each set of the axial reinforcing fibers (1) is repeatedly wound in a diametrical direction.
8. The axial reinforcing device of an electromagnetic forming coil according to claim 6, characterized in that each set of the axial reinforcing fibers (1) is repeatedly wound through the central through hole.
9. Electromagnetic forming coil axial reinforcement device according to any of claims 5 to 8, characterized in that the axial reinforcement fibres (1) comprise Zylon fibres, carbon fibres or glass fibres.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011532213.0A CN112792203B (en) | 2020-12-23 | 2020-12-23 | Axial reinforcement method and device for electromagnetic forming coil |
| PCT/CN2021/095451 WO2022134449A1 (en) | 2020-12-23 | 2021-05-24 | Axial reinforcing method and device for electromagnetic forming coil |
| ZA2023/07264A ZA202307264B (en) | 2020-12-23 | 2023-07-20 | Method and device for axially reinforcing electromagnetic forming coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011532213.0A CN112792203B (en) | 2020-12-23 | 2020-12-23 | Axial reinforcement method and device for electromagnetic forming coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112792203A true CN112792203A (en) | 2021-05-14 |
| CN112792203B CN112792203B (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011532213.0A Active CN112792203B (en) | 2020-12-23 | 2020-12-23 | Axial reinforcement method and device for electromagnetic forming coil |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112792203B (en) |
| WO (1) | WO2022134449A1 (en) |
| ZA (1) | ZA202307264B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022134449A1 (en) * | 2020-12-23 | 2022-06-30 | 华中科技大学 | Axial reinforcing method and device for electromagnetic forming coil |
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2020
- 2020-12-23 CN CN202011532213.0A patent/CN112792203B/en active Active
-
2021
- 2021-05-24 WO PCT/CN2021/095451 patent/WO2022134449A1/en active Application Filing
-
2023
- 2023-07-20 ZA ZA2023/07264A patent/ZA202307264B/en unknown
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| ES428482A1 (en) * | 1973-10-23 | 1976-12-16 | Controls Co Of America | Improvements introduced in a coil assembly. (Machine-translation by Google Translate, not legally binding) |
| JPS6151811A (en) * | 1984-08-22 | 1986-03-14 | Hitachi Ltd | Resin mold coil |
| CN1658343A (en) * | 2004-02-16 | 2005-08-24 | 特变电工股份有限公司 | Reinforcing device and method for high-temp superconducting coil |
| CN101075495A (en) * | 2007-04-20 | 2007-11-21 | 中国科学院电工研究所 | Bearing of large cake-shaped high-temperature superconductive magnet |
| CN101590501B (en) * | 2009-07-03 | 2011-05-11 | 武汉理工大学 | Thermo electromagnetic forming method of magnesium alloy sheet material |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112792203B (en) | 2021-11-09 |
| ZA202307264B (en) | 2024-02-28 |
| WO2022134449A1 (en) | 2022-06-30 |
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