External magnetic concentrator and electromagnetic forming device

Abstract

The application discloses an external magnetic concentrator and an electromagnetic forming device. The magnetic concentrator has two through holes, a first through hole is used for placing a coil, a second through hole is used for placing a workpiece to be processed, and a gap is arranged between the first through hole and the second through hole. The magnetic concentrator can make the workpiece to be processed located outside the coil, realize opening and closing of the magnetic concentrator, and facilitate workpiece taking. The electromagnetic forming device is composed of the external magnetic concentrator and the coil. Two or more electromagnetic forming devices can be cooperated with each other, the superposition of magnetic fields is realized, and the processing effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of material forming technology, specifically relating to an external magnet collector and an electromagnetic forming device. Background Technology

[0002] Electromagnetic pulse forming is a technique that uses electromagnetic energy to process metal workpieces. During the forming process, a discharge device discharges onto a coil, generating a strong magnetic field inside the coil. Due to electromagnetic induction, a current is induced inside the workpiece, which then experiences electromagnetic force in the magnetic field, causing it to deform.

[0003] To improve forming results, electromagnetic forming devices often place a magnet collector inside the coil, with the workpiece to be formed located within the magnet collector's working area. When current flows through the coil, it first induces a current in the magnet collector, which then concentrates the induced current, generating a stronger magnetic field within the working area.

[0004] The forming effect and coil life are important factors to consider when designing electromagnetic forming equipment. Most existing electromagnetic forming equipment uses only one coil, with the magnet collector located inside the coil. To increase the forming effect, a large current needs to flow through the coil, causing the coil to deform due to its low mechanical strength. This results in a short coil life, and the magnet collector inside the coil is often cylindrical, making the device difficult to fix and unable to process irregularly shaped workpieces, thus limiting its application scenarios. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an external magnet collector and an electromagnetic forming device to address the shortcomings of the prior art, thereby solving the technical problems of insufficient mechanical strength and limited application range of electromagnetic forming coils.

[0006] The present invention adopts the following technical solution:

[0007] An external magnet collector includes a device body with a first through hole and a second through hole spaced apart on the device body. The first through hole is used to generate current, and the second through hole is used to place the workpiece to be processed. A gap is provided between the first through hole and the second through hole.

[0008] Specifically, the gap is designed to connect the first through hole and the second through hole.

[0009] Specifically, the length of the second through hole is less than the length of the first through hole.

[0010] Specifically, a connecting part is provided along the axial direction of the device body, dividing the device body into a first body and a second body.

[0011] Furthermore, a groove is provided on the device body near the connection part of the second through hole.

[0012] Another technical solution of the present invention is an electromagnetic forming device, including an external magnet collector, wherein a coil is disposed in the first through hole of the external magnet collector.

[0013] Specifically, the coil is made of flat copper wire and is placed inside the first through hole, and the outside of the coil is wrapped with non-conductive fiber composite material.

[0014] Specifically, the coil is set in the first through hole using the Bitter coil method.

[0015] Specifically, the external magnet collector includes multiple units.

[0016] Furthermore, the second through hole of each external magnet collector is concentrically arranged.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] An external magnet collector has a gap between a first through hole and a second through hole, allowing the current induced by the coil to circulate between the two holes, thus altering the current distribution. When the circulating current flows through the area near the second through hole, a magnetic field is generated in that area, enhancing the magnetic field within the magnet collector's operating region. Because the magnet collector is located outside the coil, it is larger than a magnet collector located inside the coil. However, changes in its shape do not affect its performance, allowing for customization based on application scenarios and broad applicability.

[0019] Furthermore, the gap extends axially, preventing current from flowing through it.

[0020] Furthermore, the length of the second through hole is shorter than the length of the first through hole, causing the current induced by the coil to concentrate at the second through hole, generating a strong magnetic field.

[0021] Furthermore, the magnet collector can be divided into two parts, allowing it to be opened. The openable structure does not affect the magnet collector's performance, and it facilitates the handling of longer workpieces during processing.

[0022] Furthermore, due to the skin effect, the openable contact portion of the external magnet often has a very high current density, which can easily cause contact welding. The groove can effectively prevent this risk.

[0023] An electromagnetic forming device is provided, wherein a magnet collector is located outside a coil. The shape of the magnet collector can be flexibly designed to achieve a good magnet collection effect. The coil is located inside the first through hole of the magnet collector. This structure enables an induced current to be generated in the magnet collector when current flows through the coil, so as to facilitate the electromagnetic forming of the workpiece to be processed in the working area of ​​the magnet collector.

[0024] Furthermore, the coil is wound with flat copper wire and reinforced with non-conductive fiber composite material to improve its strength and lifespan.

[0025] Furthermore, the coil adopts a bitter coil form, which improves the coil's strength and lifespan.

[0026] Furthermore, electromagnetic forming devices can be used individually or in combination to achieve magnetic field superposition of multiple electromagnetic forming devices. When the processing effect is the same, multiple electromagnetic forming devices work together, and the current flowing through the coil of each device is smaller than the current in the coil when a single device is working, which can greatly improve the service life of the coil.

[0027] Furthermore, the second through holes of two or more external magnet collectors are concentrically arranged and placed one above the other to achieve the superposition of the magnetic fields of two or more electromagnetic forming devices.

[0028] In summary, the present invention can enhance the magnetic field in the working area of ​​the magnetizer and improve the service life of the device.

[0029] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the openable external magnet collector of the present invention;

[0031] Figure 2 This is a schematic diagram of the integrated external magnet collector of the present invention;

[0032] Figure 3 This is a schematic diagram of the electromagnetic forming apparatus of the present invention, wherein (a) is an overall view and (b) is a cross-sectional view;

[0033] Figure 4 This is a schematic diagram of the external magnet collector of the present invention;

[0034] Figure 5 This is a schematic diagram of the two electromagnetic forming devices of the present invention, wherein (a) is an overall view and (b) is a cross-sectional view.

[0035] Among them: 3. gap; 4. external magnet collector; 401. first through hole; 402. second through hole; 5. coil; 6. connecting part; 7. groove; 8. gap. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0040] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0041] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0042] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0043] This invention provides an external magnet collector and an electromagnetic forming device. The magnet collector has two through holes: a first through hole for placing a coil and a second through hole for placing the workpiece to be processed. There is a gap between the first and second through holes. The magnet collector allows the workpiece to be processed to be located outside the coil, and the magnet collector can be opened and closed for easy workpiece handling. The electromagnetic forming device consists of an external magnet collector and a coil. Two or more electromagnetic forming devices can cooperate with each other to achieve magnetic field superposition and improve the processing effect.

[0044] Please see Figure 1 This invention discloses an external magnet collector, comprising a device body with an openable structure, including a connecting portion 6 located at the center of the device body. The device body can be separated from the connecting portion 6 into a first body and a second body for easy workpiece handling. When the connecting portion 6 is closed, the first and second bodies of the device body are attached together, and current flows through the connecting portion 6. The device body is provided with a first through hole 401 and a second through hole 402 at intervals. The first through hole 401 is used to place a coil 5, and the second through hole 402 is used to place a workpiece to be processed. A gap 3 is provided between the first through hole 401 and the second through hole 402, and the gap 3 is 1mm wide, so that the air between the gaps is not broken down when the device is energized.

[0045] The device body has a groove 7 at the connection point near the second through hole 402, which can avoid contact welding during operation. The groove 7 has a gap width of 1 to 3 mm, and the first body and the second body do not contact each other at the groove 7.

[0046] Please see Figure 2 The device body is an integral structure. A gap 3 is provided between the first through hole 401 and the second through hole 402. The gap 3 is provided through the axial direction and can prevent current from flowing through the gap 3.

[0047] The length of the second through hole 402 is less than the length of the first through hole 401, which allows the current induced by the coil 5 to be concentrated at the second through hole 402.

[0048] Please see Figure 3 The present invention provides an electromagnetic forming device that can be used for forming, welding, and stamping of workpieces; it includes an external magnet collector 4 and a coil 5; the coil 5 is disposed in the first through hole 401 of the external magnet collector 4.

[0049] Coil 5 is made of flat copper wire and reinforced with non-conductive fiber composite material. Alternatively, a biter coil can be used to improve the coil's strength and lifespan.

[0050] The electromagnetic forming device of the present invention can be used alone or in combination with each other, so that the second through holes 402 of two or more external magnet collectors 4 are concentrically arranged to achieve the superposition of the magnetic fields of two or more electromagnetic forming devices.

[0051] Please see Figure 4 The schematic diagram of the electromagnetic forming device of the present invention is as follows:

[0052] Figure 4 The middle arrow indicates the direction of current flow. When current flows through coil 5, an induced current is generated in external magnet 4. Due to the presence of gap 3, the induced current forms a circulation around the first through hole 401 and the second through hole 402, and a strong magnetic field is induced in the second through hole 402. The workpiece to be processed is deformed under the action of electromagnetic force.

[0053] Please see Figure 5 The electromagnetic forming apparatus of this invention can be used in combination with one or more other devices. The second through-holes 402 of the two or more electromagnetic forming devices are concentric, with a gap 8 between them. The gap 8 ensures that current flows only within each electromagnetic forming device, minimizing the mutual influence of current between each device. However, within the second through-hole 402, the magnetic fields can be superimposed. The two or more electromagnetic forming devices work together to achieve the same magnetic induction intensity in the second through-hole 402 with a smaller current flowing through the coil 5, thus achieving the same processing effect. In this case, the coil 5 is less prone to deformation, and its lifespan is greatly improved.

[0054] The specific implementation steps of the external magnet collector and electromagnetic forming device for electromagnetic machining of pipe fittings according to the present invention are as follows:

[0055] Example 1

[0056] The coil 5 is placed inside the first through hole 401 of the external magnet collector 4. The coil 5 is not in contact with the external magnet collector 4 and is not electrically connected.

[0057] Coil 5 is connected to an external circuit. The external circuit discharges to coil 5 through a capacitor. The opening of the external circuit is controlled by a gas switch.

[0058] The metal tube to be processed is placed inside the second through hole 402. The material of the metal tube can be copper, aluminum, etc. After the metal tube is placed, the gas switch of the external circuit is turned on, and current flows through the circuit. Under the action of the large current, the coil 5 induces a current in the external magnet 4. The induced current generates a strong magnetic field in the second through hole 402, causing the metal tube to deform under the action of electromagnetic force, and the processing is completed.

[0059] After processing, open the external magnet 4 at the connection part 6 and take out the metal pipe.

[0060] Example 2

[0061] The coil 5 is placed inside the first through hole 401 of the external magnet collector 4. The coil 5 is not in contact with the external magnet collector 4 and is not electrically connected.

[0062] The second through holes 402 of the two external magnet collectors 4 are placed concentrically to form the working area for metal pipe processing.

[0063] Coil 5 is connected to an external circuit. The two coils 5 are connected in parallel. The external circuit discharges to the coils 5 through a capacitor. The opening of the external circuit is controlled by a gas switch.

[0064] The metal tube to be processed is placed inside the second through hole 402. The material of the metal tube can be copper, aluminum, etc. After the metal tube is placed, the gas switch of the external circuit is turned on, and current flows through the circuit. Under the action of the large current, the coil 5 induces a current in the external magnet 4. The induced current generates a strong magnetic field in the second through hole 402, causing the metal tube to deform under the action of electromagnetic force, and the processing is completed.

[0065] After processing, open the two external magnet collectors 4 at the connection part 6 and take out the metal pipe.

[0066] In summary, this invention provides an external magnet collector and an electromagnetic forming device. The magnet collector is located outside the coil, allowing its outer contour structure to be adjusted according to specific application scenarios. Furthermore, the external magnet collector boasts high mechanical strength and a long service life. Based on the characteristics of the external magnet collector, it can adopt an openable / closable structure, divided into two closable parts, facilitating workpiece processing. The external magnet collector enables cooperation between two or more magnet collectors, achieving the same processing effect as a single magnet collector even when the current inside the coil is lower.

[0067] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An electromagnetic forming apparatus, characterized in that, The device includes an external magnet collector (4), which comprises a device body. A first through hole (401) and a second through hole (402) are spaced apart on the device body. The first through hole (401) is used to generate current, and the second through hole (402) is used to place the workpiece to be processed. A gap (3) is provided between the first through hole (401) and the second through hole (402), and the gap (3) extends through both the first through hole (401) and the second through hole (402). The length of the second through hole (402) is less than that of the first through hole (401). The length of the device body is such that a connecting part (6) is provided along the axial direction of the device body, dividing the device body into a first body and a second body. A groove (7) is provided on the device body near the connecting part (6) of the second through hole (402). The first body and the second body do not contact each other at the groove (7). A coil (5) is provided in the first through hole (401) of the external magnet collector (4). The coil (5) is set in the first through hole (401) by using flat copper wire winding. The outside of the coil (5) is wrapped with non-conductive fiber composite material.

2. The electromagnetic forming apparatus according to claim 1, characterized in that, The coil (5) is set in the first through hole (401) in the manner of a Bitter coil.

3. The electromagnetic forming apparatus according to claim 1, characterized in that, The external magnet collector (4) includes multiple units.

4. The electromagnetic forming apparatus according to claim 3, characterized in that, The second through hole (402) of each external magnet collector (4) is concentrically arranged.

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